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On the control mode of three-phase asynchronous motor

Control mode of three-phase asynchronous motor:1. Direct start - the method is simple, the cost is low, and most motors with small capacity are started directly.2. Step down starting of self coupling transformer - the advantage is that it can be directly controlled manually or automatically controlled by AC contactor. It is durable and low maintenance cost. It is suitable for all no-load and light load starting asynchronous motors.

What is the slip of three-phase asynchronous motor?

What is the slip of three-phase asynchronous motor? The driving torque exists only when the closing coil has induced current. The torque is determined by the current of the closed coil and exists only when the magnetic flux in the ring changes. At this time, there must be a speed difference between the closed coil and the rotating magnetic field.

What are the causes of overload of three-phase asynchronous motor?

Although the operation of three-phase asynchronous motor is generally stable and the accident rate is small, it does not mean that there is no fault. If the load it drives exceeds the rated power of the motor, the motor will be overloaded.

What is the method to reduce the vibration of three-phase asynchronous motor?

The vibration of asynchronous motor is the focus of motor structure design at present. It is composed of electromagnetic vibration, mechanical vibration and gas vibration. Electromagnetic vibration: the interaction of the magnetic field in the air gap of the motor generates electromagnetic force varying with time and space on the rotor and stator, causing the motor to vibrate.

What are the advantages of permanent magnet synchronous motor compared with AC asynchronous motor?

Permanent magnet synchronous motor and AC asynchronous motor are often heard in the power system, and permanent magnet synchronous motor accounts for the vast majority in frequency. What are the differences between them, and what are their advantages and disadvantages?

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