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:How a phase shift between the current in the poles of a motor causes a rotating magnetic field to be created?
This relates to an ac motor, (Alternating Current). The AC current has a sinusoidal wave, of 60 cycles per seconds(USA). Therefore the current is alternating from positive to negative once in each cycle. The coils in the field or armature of the motor, alternately create a magnetic field that alternate synchronously with the current, creating a N(pole) or a (S) pole magnet at the core of the coil. It is this alternating pole (N to S toN to S.....on and on )that creates the attraction or repulsion between the magnetic fields in the housing(stator) and rotor of the motor, causing the rotational movement. A direct current passing thru a coil which is wound around an iron core will produce a magnetic field that makes one end of the iron core as N(pole), the other as(S) pole, steadily. The same set up , but with an alternating current (A.C) will create alternating N pole, and S pole at the same end of the core, changing at the rate of the frequency of the ac supply.
Q:why is a thermostatic trip required in a motor driven by a variable ac speed drive (inverter)?
Most motors have a fan attached to the shaft or fins on the ends of the rotor to move air through the motor or over its outer surface to remove the heat that is generated in the motor. With variable speed operation, the air movement may not be sufficient to keep the motor from overheating if the motor operates for too long a time at too low a speed. Since that can happen even when the load torque is less than or equal to rated torque, an overload relay that monitors the motor current may not be sufficient to protect the motor from overheating. Motors that are specifically designed for variable speed use often have larger fan blades, larger wire in the windings, more surface area exposed to air flow, more and higher quality iron in the core and other features to make the motor more efficient and to improve the cooling. Such motors may not need thermostats. The variable speed control unit can also be designed to monitor the speed vs. time as well as the current to provide electronic protection. Even with these motor and control design features, local regulations may require thermostats. The requirement may or may not be related to the kW rating. The regulations may be more strict for motors used where flammable or explosive materials are present.
Q:Blower motor will not work.. blows nothing ac or heat what to do?
Must not be a blown fuse in the elec. supply to the blower if it works all day for some times and not at all another. Has to be a loose connection in the circut between your ignition/start key switch and the blower elec. motor. Probably will take a trained mechanic to trace down the trouble -- hopefully quickly.
Q:how to change 2002 voyager blower motor?
It comes out from the bottom rt. hand corner of the HAVIC unit box. There should be ,if memory serves me, 5- 5/16 head screws going in from the bottom around the blower motor unit. The hardest one is in the corner.
Q:Ac fan motor blower on 1996 pontiac bonneville?
ok examine it out, your blower motor is shot, come to bolster motor vehicle areas and we are able to positioned it in for unfastened. Disclaimer: in basic terms strengthen motor vehicle areas in hazel eco-friendly,al will try this till you're fortunate.
Q:what are the factors to be considered while designing the AC universal motor.?
Money, money, and money. How much are you willing to spend?
Q:How to control the speed of AC motor
The starting mode of three-phase asynchronous motor includes:Full voltage direct start, step-down start, increase rotor circuit resistance start.For Buck start, it mainly includes the start of autotransformer, the change of star delta and the start of variable voltage. When the asynchronous motor starts, the rotor is in a stationary state with a slip rate of s=1. At this point, the rotor resistance of the T type equivalent circuit is very low, so the starting current is larger, and the starting current can be lowered by the start of the buck. As the starting torque of asynchronous motor is proportional to the square of voltage, so it is necessary to guarantee the motor's starting ability for step-down start.
Q:can i use ac motor in windmill?
Q:Can you please explain how a magnetic DC Motor ( with a commutator ) and a Magnetic AC Generator works ?
The principle of operation of a dc motor is that current through a coil of wire forms an electromagnet. Lets assume the electromagnet is formed in the rotating part of the motor (rotor). that gets its power through the split rings and carbon brushes. The fixed portion of the motor(stator) is a powerful magnet. The north pole of the electromagnet will be attracted to the south pole of the fixed magnet and cause the rotor to turn. As the magnets get near alignment the split rings(commutator) remove power from that coil, and apply power to another coil that is physical wound at an angle such its north pole will continue the rotation. the rotor will contain many coils each with a pair of contacts in the commutator.
Q:Single-phase 240V AC Motor?
As the first responder indicated, the power factor value has the same numerical value as the cosine of 40 degrees. This is 0.766 The KVA input is KVA = (E * I) / 1000 KVA = (240 * 4.8) / 1000 KVA = 1.152 The definition of power factor is the ratio of KW to KVA, therefore the formula for the power input (KW) is - KW / KVA = PF KW = KVA * PF KW = 1.152 * 0.766 KW = 0.882432 TexMav

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