YTPEZ (1P54) Three一Phase Asynchronous Motor for Travel Mechanism of Tower Crane

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Overview

The motor is a variable-
mechanisms in very harsh
frequency
working
，three-phase asynchronous motor exclusively designed for tower cranes and other similar travel mechanisms. It is applied to the travel
conditions such as construction site or open pit quarry

Features

Introduction of a spline drive shaft, with excellent mechanical bearing capacity;
Variable-frequency speed regulation in a broad range with high efficiency, small starting current, big starting torque and strong overload capability;

Duc to compact structure, small size, lightweight, high reliability, it can be quickly braked and accurately located, suitable for frequent starling and braking;

Introduction of a new brake (national utility model patent. Patent No. ZL201120188173.2, ZL2011201881643). It can buffer the startup to mitigate the impact on the
tower crane. In addition, the motor has very high security and reliability, and can reduce the maintenance time, and cut down the maintenance cost;

A thermal protection component is buried into Lhe stator winding, so the motor operation is more secure and reliable

Q: Can't tell from owners manual which fuse it is.: Have you checked all the 15 and 20 amp house fuses or breakers. That is the best guess for the problem.

Q: How would you measure the resistance of a 2-pole, 3-phase AC induction motor?Where would you put the meter leads for accurate measurement. Also, does the power need to be on or off. It's for a dishwater.The one we are using is a 2-pole, 3-phase, AC induction motor rated: 1/4 HP, 3600 RPM at 60Hz.Much detail as possible.: what's the HP of the automobiles? The frequency of the generator must be marked on it. If no longer, use an oscilloscope to seem at between the output tiers; heavily. The generator must be a three section generator to run the three section automobiles. there will be 3 warm wires, and a independent and a floor. The independent could be lacking if this may well be a delta connection. edit: finding at your final question, it appears that evidently that this generator is genuinely an vehicle alternator, that may not generate any fastened frequency AC, and could no longer generate 230 volts. by no skill 35000 watts! .

Q: Seven month old 230V, 7.5hp, 1 phase motor with start/run capacitors having trouble starting natural gas well compressor. I am pretty sure the load is still the same. Once started the motor runs within specs. Could it be the start capacitor?: Yes the capacitor could be faulty or the centrifugal switch or a bad winding or connection. The switch being easy to test as it should be made with the motor stopped. The capacitor probably best to check by changing it. You can do a rough check on the windings with an ohm meter but this may not tell you if an internal fault is shorting some of the windings but if its not the switch or capacitor then the thing's probably junk anyway. You think the load is the same but this is a big motor for single phase and compressors are hard to start so you need to be sure. Single phase motors can be a ***** when they don't work so good luck.

Q: Which type of electric motors are more powerful a.c or d.c?: AC motors can convert more power per unit of mass and more power per unit of volume. In a DC motor, almost all of the input electrical power must pass through the commutator. The commutator adds size and weight and reduces efficiency. The design of the rotor windings also requires more copper and reduces efficiency. Lower efficiency means increased heat requiring a larger motor. In the case of a brushless DC motor, there are permanent magnets in the rotor making it more like an AC motor and possibly somewhat more powerful than an AC motor of equal physical size and mass. In addition, AC motors can be manufactured in power ratings that are not possible with DC motors. The commutator limits the maximum voltage and current. AC motors can operate at higher voltages. An AC motor has been manufactured for 101,000 kW (135,000 Hp). It has two 12,500 volt, 3-phase stator windings.

Q: Explain how using a commutator rather than slip rings allows dc rather then ac to be used to drive a motor.: The commutator changes the armature's winding power connections as it rotates, so that the pole pieces are always energized to the right polarity for the motor to spin. Obligatory wiki link below has a nifty diagram.

Q: other?: Some of the largest AC motors are pumped-storage hydroelectricity generators that are operated as synchronous motors to pump water to a reservoir at a higher elevation for later use to generate electricity using the same machinery. Six 350-megawatt generators are installed in the Bath County Pumped Storage Station in Warm Springs, VA USA. When pumping, each unit can produce 563,400 horsepower (420,127 kilowatts).

Q: Can we test all the types of motors brushless, AC single phase, 3 phase, DC Motors, Servo motors etc with Megger ?thanks in advance: Only one type cannot.....the low voltage DC brushless motor like the cooling fan in computer. It has low voltage power converter module, Megger high voltage shall kill it. =======================================... Additional email reply to asker How to test motor with ohm-mter...... 3 phase motor -test all six leads between motor body, all show infinitive ohm. Use mega do the same test by setting it into 250v. Reading show 10M ohm or higher. Test resistance between two individual coils with mega, it should read 10M or higher. Use ohm-meter measure resistance of 3 coils, three reading show very close resistance. Compare the resistance from a good motor or from pass trouble shooting experience to determine it is a good motor. If one winding is much less resistance than other two or one winding is much higher than other two. This motor could be defective. If insulation test show under 1M ohm,its insulation is no more good,has electrical leaking. DC series motor: mega test between ground and leads, resistance test on both leads and compare the good motor reading. Rotate the rotor very slowly while doing resistance test,reading shall be change a bit (use analog type meter is better for this test). But resistance should not swing up and down very much. That tell how good is the brushes contact to rotor and what is the condition of several rotor coils. If at one position,resistance goes down into very small (zero) or jumps up very high. rotor needs clean or section of coil defective. Understand the construction of different type shall help you how to test it with simple ohm-meter.

Q: On a variable frequency ac drive, can you still use a amp-clamp to check the motor current? Are amp clamps only for 60 cycle power?: It is good practice to make a record of the current for all motors, but especially ones on a VFD, where your measuring procedure should agree with the display by the drive. Work out how to get proper readings and verify that all is within ratings beforehand. This is much more difficult to work out if there is a problem later. It may make sense to measure the DC bus of the VFD too. If you have a low pass filter for the meter, this shows proper voltages, and the frequency (PWM modulating frequency related to speed) can be measured on a suitable meter. You can try your clamp meter to determine whether it is meaningful or not.

Q: Please tell advantages disadvantages of both?: dc works well with batteries. ac can be plugged in the wall. dc is more portable (batts) ac doesnt run your batts dead. MIKE

Q: i want the difference in working operation at the rotor side as at synchronous motor rotor feeded by D.C current but at induction by A.C: I really like teressa's answer - very long and complete. In short synchronous motor's run in lock step with the rotating magnetic field produced by the AC field winding. There may be a phase difference - lead or lag, however the frequency with which the rotor spins is locked to the frequency of the AC power. Asynchronous motors run at a frequency not locked to the AC power, either faster or slower depending on whether power is being generated or used.

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