YTRVF(W)Variable一Frequency Three-Phase Asynchronous Stewing Motor for Tower Crane

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


With introduction of spline drive shaft, it has good mechanical bearing capacity;
The motor is a variable-frequency motor featuring a wide range of speed regulation, high efficiency, small starting current, big starting torque and overload ability;
A thermal protection component is buried into the in winding, making motor more safer and reliable;
Excellent dedicated variable-frequency insulation materials are adopted, improving greatly the insulation reliability;
Compact structure, small volume, lightweight, so it can be braked quickly and positioned accurately. It is suitable for frequent starting and braking;
YTRVFW series motor is provided with an eddy current brake on the basis of YTRVF series. It enables more smooth starting and deceleration braking, making the operation
more smooth and accurate

This series motor is divided into F1 and F2
F1 with airvane brake;will be determined by the
F2 without airvane brake;users when signing the contract but an encoder interface can be reserved

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Q:Is the 380V single-phase AC motor the same as that of the 220V AC motor?
First of all, we should understand the meaning of alternating current, that is, the line of fire. There are four lines in the alternating current power supply 380V line, one of which is the zero line. Suppose that A, B, C [phase line], D [zero line], referred to as "three-phase four wire", in the three-phase any one phase line and D line [zero line] combination is referred to as "single-phase second-line"". Three-phase four wire power also referred to as "380V", also referred to as the single-phase two-wire 220V electricity; if it is 380V should be called the motor three-phase AC motor, if 220V motor can be called single-phase AC motor, the motor wiring is of course quite different. If the three-phase AC motor is not in phase (or bad), it can not work. If the single-phase AC motor is wrongly connected to the 380V, the second phase is very dangerous, and the motor will be burned immediately.
Q:What is the stator voltage and current of an AC motor? And what is the current and voltage of the rotor?
The brand name is the stator parameter, the rotor voltage is very low, but the current is very large, about several times of the stator current.
Q:has anyone aput an ac drive on a slip ring induction motor after shortcircuiting the rotor terminals ?
Variable frequency drives VFDs) can be connected to slip ring induction motors with shorted rotor terminals. Because of ringing voltage transients that occur at the waveform switching transition points, VFDs cause voltage stresses on the motor insulation. Motors rated for VFD use are recommended, but older motors can be used. Output reactors or dv/dt filters are recommended for use with older motors. Most VFD suppliers can provide detailed recommendations. Many suppliers have experience with crane retrofits and can provide information and VFD features for coordinating the VFD operation with friction brake controls etc.
Q:I want to make an electric go-kart, can I use an AC fan motor and power it with a fisher price battery pack?
no you can't. AC motors all depend on 110 (or 220) AC. they cannot run on DC. they're called induction motors, because the magnetic field is induced in the armature. there are no brushes, and no current is supplied to the armature. the benefit is that they last longer, and don't need to have replaceable parts. so, it's back to your old lawn mower engine. your gas powered lawn mower engine, that is.
Q:Why is my heat inducer/motor running while my AC is turned on at the thermostat?
Sounds like a bad control board. The relay for the inducer motor is on that board. If the board shorts many will turn the inducer motor on as a safety. No flame up on heat is another symptom, since the inducer must be off when you call for heat. If the board is bad no A/C is also a symptom.
Q:I want speed range from 800 rpm to 5000rpm ....for that i m using ac motor ...can you help me how to use it?
changing the revs in an ac motor requires you to change the frequency of the supply. revs = number of 120 x frequency / poles. thus a two pole machine on 50 hz will rotate at 3000 rpm. thus a variable speed drive is required.
Q:How to build an digital AC ammeter for 3 phase motor?
I guess that is what you are looking for. There isnt one ammeter per motor, there is one on each phase, or a selector switch to change between phases.
Q:what is the difference between a dc servomotor and dc motors and also between ac servomotor and induction moto?
dc motors are generally permanent magnet type and rotate at high speeds 4000 to 6000 rpm. In many cases, for automatic control, such high speeds are not required. So there will be a gear train to reduce the speed. This gear train might introduce avoidable errors such as due to backlash. In short a dc servomotor is a geared dc motor. there are however torque motors which have very low inertia. These are also dc motors with special construction. Low inertia is essential for servo applications. In ac motors, stepper motor is popular. A variation of this is the ac servomotor, which has fairly low speed. Otherwise, speed is in the range of 1500rpm to 3000 rpm. Changing the speed of an ac motor is no joke. One has to provide adequate voltage, but lower the frequency! You cannot control speed well by reducing the voltage as torque decreases substantially.
Q:Why do they still make locomotives with DC traction motors if the DC system is inferior to AC?
The only advantage i see to AC units is the ability to cut out a traction motor and still have dynamic brakes on the unit.And the dynamic on an AC unit will work virtually til you stop, whereas a DC unit fades out just before you stop.And i've never had to do it but on an AC unit you can reverse them and use them to hold your train on a hill if need be.I think the AC units with all the reliance on computers are going to be a pain after they get some age on them.A railroad environment is harsh and only time will tell if they can stand up to it.
Q:Is it a synchronous or asynchronous motor that uses wire loops for its rotor?
Synchronous motor has a rotor (the non-stationary part of a rotary electric motor) spinning, that is with coils (wire loops) which produces a magnetic field which drives it. Contrast this with an induction motor, which must slip in order to produce torque. An asynchronous motor (or induction motor) is an ac motor where power is supplied to the rotor by means of electromagnetic induction. This converts electrical power to mechanical power in its rotor (rotating part). Hope this helps...

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