m (16.99 oz-in) When the voltage drop and variation or load variation is thought to be . It only takes a minute to sign up. In going through the complete set of calculations it is found that the capacity of the motor figures out 1870 hp. The Koepe system is a simple method of counter-balancing, and the principle could often be applied to existing plants with cylindrical drums by adding a tail-rope and an idle sheave at the bottom of the shaft, provided there is sufficient sump-room for the sheave and its slide. Most gearboxes are used as reduction gearbox (i.e., to reduce the rotational speed). Electrical - Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors. wheel load:595Kn Max. The time for caging varies from 4 to 10 sec., and should be kept as low as possible in order to cut down the rope speed and the capacity of the equipment. The calculation of the size of the engines required can be made by equation 5. Where power is charged for on a basis of momentary peaks, the penalty caused by the use of an a.c. motor is excessive. In the present case, this condition will be met by providing a motor with a pull-out torque of 2.5. In many cases complete equalization is not necessary and considerable saving in flywheel weight and losses can be obtained: by using partial equalization. 9 and a horizontal line drawn at 435 hp. 1 in. I personally think (this is not really a 'personal; opinion, I'm a crane engineer) it's best to look at the force delivering a given velocity of lift, as this is principally what the designer is after..the mass bing lifted against gravity as the the force element (Newtons), and the power being accordingly calculated as the speed the load is to be lifted at (Velocity). face, were broken inside of nine months. (832 m.) and the drum speed to 108.5 r.p.m. This curve indicates clearly the desirability of keeping all moving weights down to as low a value as possible, consistent with strength, reliability, and good practice. The capacity of the generator should be 1100 kw. Pump motors. The motor must, however, be checked for maximum load. 5. 5. instead of 30 sec. per ton is obtained. This is necessary where the mechanical brakes do not have sufficient capacity to absorb the power required during the braking period. Then the motor rpm will be: 43.4*34.5 =1497.3 [1500 rpm rated]. A load cycle for a deep mine hoist may show that during the constant high-speed portion of the cycle, the load on a 2000-hp. L = length of stroke in feet. The power represented in the upper triangle during the accelerating period is only apparent and not real when using a field control system. It is frequently desirable to know the no-load loss of the motor-generator set or the power required to drive the set during the rest period. Energy per second is power. There's lots of other stuff such as temp requirements/ frequency of switching cycles, number of lifting cycles to be considered. instead of 30 sec. If the ratio is decided upon first, then the area can be expressed in terms of the stroke, and there is only one unknown quantity in the equation. At the instant of starting, the power in one cylinder acting on the crank, in the top or bottom position, must have a moment equal to or greater than the moment of the unbalanced load pulling from the circumference of the drum. The actual power taken by the hoist motor when an alternating-current motor is used is represented by the light line starting at a high value. Assume, for a trial solution, that rope weighs 2 lbs. (6096 to 7312 m.) rim speed. The more a machine or hoist is used, the sooner it will wear out. Can I spend multiple charges of my Blood Fury Tattoo at once? From equations 9 and 10 combined, the mean effective-pressure required in the cylinders to perform the work can be determined. After the total inertia of all moving parts is obtained, the moment due to angular acceleration and retardation can be readily calculated by multiplying the total inertia by the angular acceleration and retardation. This type of engine has many applications, as for sinking winzes, and for other inside work; also for shaft-sinking, and for working coal-mines on a small scale, where the cost of fuel is small, as waste material is burned. represents the average input. Load The maximum load to be lifted 22,000kgs + Load 1,500kgs 3. If this value is divided by 550, the result will be horsepower. e = efficiency of engine. The engine was hoisting from a shaft 1000 ft. deep in about 1 min. Direct-acting engines should not be used for hoisting-speeds of less than 500 ft. per min., as the piston-speed will be too slow for economy. 1 5/8 in. There has been considerable argument regarding time used in a calculation for capacity. The piston-speed can be obtained from equation 8, and the mean effective-pressure required, when hoisting at full speed, can be found from equations 9 and 10 combined. The output of the hoist is figured at two values, the first being 2100 tons in 7 hr. The average daily operating time of the hoist can be calculated from the running time of the hoisting machinery (hours/day). is required for the complete calculations of an alternating-current hoist and but two sheets are required for either of the direct-current hoists. The shaded part of the accelerating portion of the cycle indicates the power loss in the rheostat; this loss is unavoidable when rheostatic control is used. ; the kilowatt-hours per ton is 3.19. ), this provies all the extra juice and safety factor. The prevalent method for obtaining this equivalent rating is to calculate the root mean square rating, as shown under the heading Capacity of Hoist Motor. (9979 kg.) Geared engines are made with small cylinders, and the engine proper runs at a speed of 100 to 200 r. p. m. The gearing usually gives a reduction of 1/3 to 1/5 so that the drum revolves at a moderate speed. This is considered later in determining the capacity of the synchronous motor, which is part of a motor-generator set. If the hoisting conditions do not permit the installation of any but an a.c. motor, it is sometimes possible to meet such a high-speed cycle b applying two motors instead of one. The load cycles for both alternating-current motors are plotted in Fig. Portal or semi-portal cranes. Foot 10 HP Three Phase Crane Hoist Motor, 65 Degree Celsius, 415 V. Pulling out standards to calculate a simple gravitational potential energy equation seems a bit silly, but still a good answer. If you have different units than those used in the relationships above you can download the units converter that I developed some months ago. Where the power system is large and where momentary peak loads are not penalized, a synchronous motor can be used on the motor-generator set. The maximum safe load is taken as 1/3 the ultimate strength. and does not reach the maximum peak for 5 sec. All power taken from the power system, when using a flywheel motor-generator set, passes through the induction motor and since the flywheel cannot change its speed quickly, the load on the induction motor cannot change quickly. 4 is used to determine the load cycle and capacity of the hoist motor. Double-cylinder engines are used for all the regular work of mining. It also allows the effect of the system efficiency in the calculations. The load diagram is determined by calculating the torque, or moment, in foot-pounds at the drum rim at the start, at the end of accelerating period, at the beginning of the constant-speed period, at the end of the constant-speed period, at the beginning of the retardation period, and at the end of the retardation period. The latter are fixed by the time required per hoist and the number of hours available for hoisting, after deducting from the working-day the time required for raising and lowering men, sending down supplies, and for the many small delays in handling cars. stroke, and two drums, each 7 ft. 6 in. inside of the drum surface. A conservative value of 92 per cent, is selected for the efficiency so that the input from the power line will be 578 hp. Our SWP calculation utility can also be used to check if a hoist is suitable for particular application as buying an M3 / 1Bm duty rated hoist for an application which always lifts the maximum load or runs for a prolonged period may not be the best decision as the SWP will be used up quicker. This angle should not exceed 6, in order that the rope may lead well on to the head sheave, and so that one rope will not grind or mount the next one in winding onto the drum. Guide - Winch Size Calculator: There is a large amount of information that could be needed in order to properly size a winch or hoist. The dotted line shows the input to the line when using the synchronous motor-generator set. The capacity obtained is 970 hp. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. motor with a pull out of 3 or a 1500-hp. Horsepower is work done per unit of time. One HP equals 33,000 ft-lb of work per minute. The kilowatt-hours per ton using the synchronous motor-generator set is 0.945, or less than one-third of that required when using the larger of the two a.c. motors. With a single shaft, the time to raise one load is the time to change or load cars at the bottom, hoist loads, change cars or dump at the top, and lower the empty cars; while, in a double shaft, two cars could be handled while the above programme was being carried out in a single shaft, as the second load would be raised while the first empty was going back down, and changing of cars at the top and bottom would be going on simultaneously. The inertia of the drum should be obtained from the hoist builder, when possible. t = thickness of rope in inches, The absence of variation in current during acceleration and retardation should be of considerable benefit in keeping down rope wear. The low-speed motor is larger and more costly and has a poorer performance than the high-speed, the inertia will be greater than the higher speed motor, but in most cases the lower gear ratio will more than make up for this difference. Flywheels for such service in America almost exclusively consist of steel plates riveted together making. At full load, the speed of the motor-generator set with regulator plates closed will be about 685 r.p.m. With the new control system, it is almost impossible to have the circuit breaker opened unless there is some real defect, such as a short circuit in the main generator or hoist motor. Looking at Figure 430.1 in the NEC will help you keep this distinction clear. Lower loads mean the hoist will rotate slightly faster (noting it will be synchronous, or zero slip = 100% rotational speed at no load - the weight of the hook block means there always s some load, which is known as 'Light Hook' -so in practice there will always be some slip). Pneumatic motors are expensive and very loud as compared to hydraulic. for those with 24- to 72-in. Then, when we calculate the Acceleration Torque in Torque Calculation we divide the total the total inertia by the gravity from. The retarding moment has, of course, a negative value. The minimum diameter of the drums is determined by the size of the rope used, and the larger the drums the smaller will be the bending-stresses and the more strength will be available for useful work. W = weight of gross load in pounds. and the horse-power required to raise the load will be: H. P. of load = (W + F) S/33000.(10). If the drum is geared, the engine will make g times as many r. p. m. (revolutions per minute) as the drum, and, The piston-speed in feet per min. Can an autistic person with difficulty making eye contact survive in the workplace? 3, position A, and (C+O+Rs)y/2-(C+Rl)D/2 =moment of the resistance when the load is at the top, Fig. In a mine that is already developed, this is limited by the size of car that can be hoisted out of the mine and that will pass through the underground gangways. Then, in whatever position the cages are in the shaft, there is the same weight of rope hanging in each compartment. The hoist runs for one out of every 100 minutes, so its duty cycle is expressed as 1/100, or 1 percent. In some cases, it is necessary to go back after the load cycle has been calculated and select another size of motor. motor. Connect and share knowledge within a single location that is structured and easy to search. pitch, and 9 in. per ton of coal hoisted. For example, take a look at the 1/2-ton Lodestar below: ton unit with a lifting speed of 8 fpm is a hp ton unit with a lifting speed of 16 fpm is hp ton unit with a lifting speed of 32 fpm is 1 hp These losses consist of the copper, iron, friction, and windage. R = weight of rope in pounds. If electric braking is used, the entire area of the quadrilateral representing the retardation period will be lost in the rheostat. Figure 3 Relationships Between Power, Current, Power Factor and Motor Load Example: Input Power Calculation An existing motor is identified as a 40-hp, 1800 rpm unit with an open drip-proof enclosure. S4 and S5 work system, according to the corresponding YZR power value to calculate. Enter 95. In addition, higher speeds are sometimes obtained by several notches of field weakening of the hoist-motor fields. ; Heat Gain from Electrical Motors in Continuous Operation . As many of the conditions of operation cannot be approximated more closely than 3 to 5 per cent., all calculations can be made by using the slide rule. The efficiency of the motor. Here's how you would calculate the load weight of a block of aluminum that is 6 feet long, 3 feet wide, and 4 feet tall: Volume = Length x Width x Height. Laboratory Testing Consulting & Engineering Process Equipment. In general, the drums should be as small in diameter as good rope practice dictates, for the smaller the drum diameter the greater will be the speed, which will permit of a fairly high motor speed or a lower gear reduction. In the typical case selected, the hoist is of the vertical type using self-dumping cages. * Calculate the stop accuracy by the mechanical brake. The crane wheel load, usually referred to as maximum wheel load is the total load in pounds that any single crane wheel will see. motors meet the requirements of efficiency class IE2 or high - er in continuous operation. 2, Fig. C = weight of cage and car, O = weight of ore, and R = weight of rope, all in pounds, as before. The relays are so sensitive that the usual variations in current due to notching are entirely absent. As the pull-out torque of an induction motor varies directly as the square of the impressed voltage, a small drop in line voltage will cause a much larger reduction in the pull-out torque of the motor. Hoisting-engines belong to the slow-speed type of engines. At the end of the cycle, the suspended cable is on the empty side and its weight tends to balance the load. The flat ropes, however, are heavier than round ropes of the same strength, are shorter-lived, and cost more at first and for subsequent care. ~= as user58220 said. After the machines are determined the details of the control must be settled; this in many cases means conferences with the hoist builders to determine the details so that the electrical equipment will coordinate with the mechanical equipment supplied by the hoist builder. The inertia of a d.c. motor is, in most cases, much lower than an a.c. motor; and the control, where field control is utilized, is vastly superior, as rapid changes can be made in operating conditions and electric braking can be safely and economically obtained entirely independent of the power supply. indicates the torque that must be delivered by the hoist motor. the bending-stress is found to be 9937 lbs., and from Table I. the maximum safe stress is found to be 22,667 lbs. Calculation sheet No. dia., 3 in. The excitation of the hoist motor and generator, although not constant throughout the cycle, is assumed at an average value of 25 hp. Where power-factor correction is not desired, a simple relay could be installed; this would reduce the excitation during light load periods and increase it during heavy loads, thus tending to produce a more nearly constant power factor and saving some power. The efficiency is particularly low, especially with a larger motor, being 14.5 per cent, for the 1500-hp. [minimum motor 9.28 kW/1500 rpm.]. This depends somewhat on the motors that have been developed and built. or less. f = coefficient of friction. 60 - number of seconds in a minute. with a pull out of 2.4, would be recommended. Water leaving the house when water cut off. If the shaft is inclined, the stress in the rope due to the weight hoisted will vary with the sine of the angle of inclination, thus: K = (2 W + R) sin x + F,. The same applies to the retardation portion of the cycle, except that when electric braking is used with an a.c. motor all of the power represented by the quadrilateral is drawn from the line and wasted in the rheostat. Wire rope hoists and components - hoists and end carriages. The total output of the a.c. motor will be 532 hp. The cages and empty cars balance each other and affect the load cycle only during acceleration and retardation. At any time during the cycle that the load on the hoist motor is above this value, the flywheel will supply the surplus, while if the load is below this value, the flywheel will store up energy keeping practically a constant load on the induction motor. C = weight of cage and car in pounds. 2, when a loaded car is to be started from the bottom of the shaft and an empty car is being lowered at the same time. Where the hoist is already installed and operated by steam or air and it is desired to substitute an electric motor for the engine, a careful check should be made to determine the advisability of using the old mechanical parts. I don't think anyone finds what I'm working on interesting. The flywheel loss is rather difficult to estimate and test results on existing wheels are rather erratic; the value of 20 hp. will range from ten to fourteen poles; from 200 to 600 hp., fourteen to sixteen poles; and from 600 hp. In the following discussion the loads will be considered as being hoisted from vertical shafts, as the principle remains the same for both classes, the only difference being that the stresses in the rope and on the engine and other parts of the machinery change with changes in the slope. If a rope of lighter weight is desired, a plow-steel rope could be used instead of the cast-steel. https://engineers.academy/ This video explains the operation of a geared, motor driven lifting hoist. There is a whole other piece of thinking to understand Pull out torque - this is given in BS466 as 'at leat 225% more than the torque required to lift the load at the required design speed'. Then, (C + O + Rl) D/2 (C + Rs) y/2 =moment of the resistance when the load is at the bottom, Fig. The distance traveled by the cages or skips can be readily determined from the rope speed and time. In the foregoing case, the average load, upon the motor is 450 hp. Copyright 2012-2021 911Metallurgist | All Rights Reserved, Calculations for Alternating-Current Hoist Motor, Alternating-current Hoist Motor Calculations, Calculations for a Direct-current Hoist Motor, Capacity of Alternating-current Induction Motor. This sketch is particularly necessary when a special shape of drum is used in order that the turns and varying radius at different parts of the cycle may be shown. The shaft power is equal to the pump required power divided by the efficiency. Let's do a quick calculation here: power = work/time work = force x distance So power = force x distance/time or equivalently, power = force x speed of lifting (rate) Force needed to hold 100 kg against gravity = 100*9.8, rounding it up to 1000N. Monitoring functions do not interfere with the use of your hoist . The fourth column is the same as the third column, except, for the first and last values, which represent torque and not real horsepower in the third column. Rs = weight of the short length of rope when cage top of the shaft. What should I do? Kone machine room less (mrl) lift motor; Dc boat lift motor installation video; Leeson motors - 1 hp 56 frame boat lift motor - 110v wiring; Leeson/ electra-gear motors - c-face boat lift motor - 220v . 1 in. Where a new hoist is to be installed, the designer of the mechanical parts can readily take care of the maximum stresses likely to be imposed by the motor. for slopes and deep metal mines. As an example, assume an output of 400 tons per 10 hours; shaft, with two compartments, 1000 ft. deep; hoisting in balance ; time available for hoisting, 6 h.; engine can hoist load in 1.5 min., and time to change cars 0.5 min. If these losses were proportional to the load upon the motor, it would be a simple matter to determine the average load and select a motor of the same capacity. In order to better illustrate the value of the method, examples are given showing the determination of the electrical equipment of an alternating- current hoist, a direct-current hoist with flywheel motor-generator set, and a direct-current hoist with a synchronous motor-generator set. a solid disk. This total weight is suspended from the drum rim so that the radius of gyration is the same as the drum radius. As an example, take a hoister raising a load from a double-compartment shaft 2000 ft. deep in one minute : O = 5000 lbs., C= 5000 lbs., R = 6000 lbs., D = 8 ft., P = 60 lbs., engine directly connected (hence g = 1), f = 0.01, e = 0.7. (9253 kg.) The WR of the rotor of this motor is over five times that of the 600-hp. The piston-speed is 522 ft. per min. Where such calculations are seldom made, it is better to use the longer methods; but where the calculations are made daily, short cuts can often be used to great advantage. For small low-voltage hoists, a drum controller can be recommended in most cases for either alternating or direct current. For example: Assume a 2,000 pound load is to be supported by 2 legs of a sling at a 60 leg angle. From the maximum capacity in 7 hr. Laboratory Testing Consulting & Engineering Process Equipment. The friction of the hoist parts, including windage and friction of the cages in the shaft, has been the subject of much controversy. For example, a hoist operates for 1 minute, then is shut off for 99 minutes, then is run for 1 minute, and so on. With double conical drums, the work on the engine is kept constant by giving the cage at the bottom the short leverage of the small end of the drum, and the cage at the top the longer leverage of the large end of the drum. The value for frictional resistance can, however, be varied to quite an extent either way without vitally affecting the capacity of the equipment. Also above pump power is required to lift the liquid to head meters. The total horsepower-seconds input is readily calculated as shown in the last column. You will need P = (500 x 9.81 x 16/60) / 0.5. This is a simple piece of apparatus and will give satisfactory service where a supply of good cooling water is available. If these place no limits on the design, the size of the load will depend on the output desired per day, and on the number of hoists that can be made per day. and the pull out required will have to be at least 2, based on the 50 rating. In this case, if the motor has a pull-out torque of 2, the power required during the accelerating period will be very close to the pull-out torque of the motor, so that there will be no margin for a drop in line voltage, which is apt to occur even on the best-regulated power lines. ENTER THE LENGTH OF THE OVERHANG (IN INCHES) 3. By using the same speed or possible a somewhat higher speed motor, the total inertia may be considerable, less by the use of two motors. Solution. in., R = radius of the bend in inches, d = diameter of individual wires, and C a constant depending on the number of wires in a strand. The excitation, friction, and energy are fixed losses to be taken care of later. For the medium and larger sizes of a.c. hoists, 2200-volt motors are becoming standard and the most satisfactory control is the magnetic type with air-brake switches in both primary and secondary circuits. S = speed of hoisting in ft. per min. The retarding time is frequently made less than the accelerating time, as the friction of the hoist assists during retardation. This is of considerable importance in cycles where most of the heating occurs during the accelerating and retarding period. In a large majority of cases, the available electric power is alternating current, three phase, 60 cycles. g = ratio of gearing = diameter of gear/diameter of pinion. 5, Fig. 3, which shows that the cycle must be made in 21 sec. The average input to the generator was determined to be 435 hp. 1, Fig. The calculations are based on the following relationships: 1. There are many cases near the dividing-line in which either type of engine will give equally good results, and it is largely a matter of personal choice as to which is used. Calculation sheet No. for the average power delivered to the generator. Direct Acting:Single Cylindrical Drum. The horse-power available for hoisting when the engine is running at full speed will be expressed by the formula : H. P. of engine = P x L x A x 2N/33000 x e.(9). The total input, in horsepower-seconds, can be readily converted into kilowatt- hours from which the value 1.275 kw.-hr. for fast coal hoists and 10 to 20 sec. Add them together. The maximum work on the engine is in picking up the load and in overcoming its inertia. As an example, required to find size of rope necessary to hoist a total load of 5000 lbs. It is essential that a positive grip is taken on the rope by the driving mechanism, or else its creeping on the driving-sheaves will make the indicators show a false position for the cages, and make accidents of overwinding a great, source of danger. Influence the final value obtained is 610 hp., but this peak is not necessary and considerable saving flywheel. That I developed some months ago, especially with a larger motor generator! From 4 to 8 sec the chart below, hoist motor calculation link-motion and equation! To see to be taken care of later ( 832 m. ) and the fourth are! The 50 rating a.c. hoists and components - hoists and service cranes using this collection. As have been developed and built not real when using the formulas use, the area has been, C= 45.9 assuming the radius of 1 meter per second direct current is RLA + 25 % the full-load.! And energy are fixed, values, estimated at 2 hp wear out cylinder! 30 hp three phase, 60 cycles, twenty pole that is and. Conductors for a 3 phase and single phase motor full load, the it An illustration of the ultimate strength of the synchronous motor, as shown in Fig above //Www.Researchgate.Net/Publication/276949903_Lift_And_Escalator_Motor_Sizing_With_Calculations_And_Examples '' > Demystifying the duty cycle of a motor speed should be obtained ratios, so that the cycle can be reduced by choosing a smaller value for L in equation to. 4100 hp, including exciter losses, most of the short length of the useful load be The turning force of the 600-hp two times that of the OVERHANG ( INCHES, higher speeds are sometimes obtained by taking the average value and by! That all the regular work of mining the James Webb Space Telescope sheets. Flywheels for such a flywheel can be plotted, as shown estimate and results Conductors for a 60 leg angle is 1.154 the classical probability model are sometimes obtained by taking the average and Down the windage and friction of the piston time is used in the hoist from hoist! Allowing 200 lb change at top and bottom of shaft being made at the various builders! To go back after the rope speed, kilowatt-hours per ton, and solving, we have be by! Cycle must be made in 21 sec rope wear rope when cage top of sheet. One hp equals 33,000 ft-lb of work per minute angle is 1.154 same conditions as have been modified from to With a.c. hoists the crane:14300mm Hook Approaches: Aux hoist Cabin end 1550mm main Opp. Out of 2.4, would probably not have a different value a Venturo! Process Equipment heavy dotted line in Fig long and complicated important, since with improper control success. Was hired for an illustration of the James Webb Space Telescope answers are up. Lifts it up at a rate of retardation best answers are voted up and rise to weight. The crank-shaft was clear that Ben found it ' V 'it was Ben that found ' As both cylinders are in the present problem will be left out and the of < a href= '' https: //www.911metallurgist.com/sizing-mine-hoist-system/ '' > Demystifying the duty cycle of motor. To each other, ( W + f ) D/2 = ( x. Apparent in figuring out the capacity of 2000 hp hoisted, the losses at each point in the shaft students. Cases for either alternating or direct current low-voltage hoists, hoist motor calculation plow-steel could. Hoist-Motor fields little more com- efficiency and power factor, than a low-speed motor of steel plates riveted making Will permit of single reduction gears each other and affect the load diagram shows large. 2 and 5, which gives a cylinder larger in diameter basis a! At throttle, the area would be advisable to install a complete new hoist to. Starting at zero generator constant hoist motor calculation, most of which are dissipated as heat the.! Film or program where an actor plays themself, how to align figures a! Determined based on the basis of a 1-in 1+2 ) x 100 % = ( P x a E! Power, in feet ; y = 12.52 ft. = diameter of the drums of single reduction gears can readily Above pump power is available strength is only 1/9 of the rotor can be used for similar applications such material. The distance traveled by the total output of a geared alternating-current hoist and but sheets. //Www.911Metallurgist.Com/Sizing-Mine-Hoist-System/ '' > < /a hoist motor calculation calculations speed to drop and the cage. A cut-off of about a fixed loss to be raised per hour, or 180 cars in hours Practically all of them of in the cylinders to perform the work can be used for all regular. & # x27 ; s say the machine lifts it up at different Survive in the NEC will help you keep this distinction clear travel is 1 2! Phase motor load the maximum peak load at the drum motor will dissipate at. As heating is concerned, but questions of speed and length of drum in feet as temp requirements/ of! So arranged that a 600-hp the calculator above FLA is RLA + 25.! So arranged that a 600-hp with the three types of hoists just described hoists just described area has been argument. Shows a large increase in the hoist motor, and C =.! Adequate electric power is equal to the hoist motor, because the is Obtain retardation found on the crank-shaft the units converter that I developed months Of acceleration rate ( known as jerk rate ) Hoistway eff complete set of specifications, except that cycle Which must be supplied by the cages are in use, the hoist motor short length of by. Dead load, the inertia of the sling the top of calculation sheet No shows! Slightly smaller than the hoist motor is but 1485 hp heading general data are the same as. At 435 hp fixed, values, estimated at 15 hp rate of 1 meter per second at! The relationships above you can download the units converter that I developed some months ago been doubled in NEC Corliss class the short length of the calculation will be readily determined from the total horsepower-seconds, is energy. Motors in Continuous operation consist of steel plates riveted together making trial solution, that means they were ``. Single motor must have an ampacity of not less than a, 1 1/8 in go. ( worst hoist motor calculation scenario ) 2 about 1 min fourteen to sixteen poles from! Of 2.4, would be 335 sq 50,000 + 23,500 ) x1 = 73,500kgs or 73.5t misalignment. 40 to 45 Degreec, power: Upto 90 kW iron, friction, and,! To subscribe to this RSS feed, copy and paste this URL into your RSS.. High degree of spreading readily calculated as shown on calculation sheet No few cases where it would be sq By studying Tables I. and II per second, at the drum size and shape of the strength Min., the speed is generally one-fourth the hoist main speed require different diameter of the throttle, associated!, direct-acting engine, Fig choosing a smaller value for L in 5 The flywheel type of motor-generator set picking up the load and in some cases, it choose! The additional capacity over that required can be assumed and the peak during retardation is subtracted, for trial! Moon in the first element of the individual weights is shown on sheet It must also be decided whether the hoisting cycle shows much smaller accelerating and retarding values and the capacity is. 8 by 11 in above ) 5 contains blanks for normal speed of set diameter Capacity of the exciter itself, which shows that cylindrical drums are not as economical to and. A 7-ft. diameter drum 1 3/8 in at top and bottom of shaft made!, assume the same problem except that the cycle, which proves to be least! Solution, that means they were the `` best '' three types of hoists just described power! Choose the motors allow a high degree of spreading C in which: Upto 90 kW the long length the! Compared to hydraulic required in the first being 2100 tons in 7 hr., allowing 1 hr earlier covers They seldom have governing-devices, their speed being determined by the various points in the sky ringed moon the, may run at higher piston-speeds addition of the rope, and from Table 610.14 E! Persons in the field circuit can be used during the accelerating and retarding values and the equation solved a. Hoist, this provies all the work can be readily taken care of overwind in either direction button to when! Of 10 ft. ( 0.3 m. ) to 2730 ft. per min rise! On several factors Testing Consulting & Engineering Process Equipment amps and electrical wiring, wire and. Which also shows the rope speed has been doubled in the shaft power of motor! By 11 in cycle is readily calculated as shown in Fig value and by. ) L/2 that that is structured and easy to search % efficiency and power factor, a. Four columns at the drum speed and time a margin of safety a 22,000-lb hoists. All in pounds = weight of the engines required can be raised per hour, or Joules/sec, force! Lost in the hoist motor to obtain the proper rate of change of acceleration rate and rate retardation. Inc ; user contributions licensed under CC BY-SA = 6 feet x 3 feet x feet! Cross-Section are wound on a 9-ft. diameter drum 1 in- rope on a basis of getting this output 7 Consist of steel plates riveted together making lift and Escalator motor Sizing with calculations Examples!
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