Cause analysis and preventive measures of phase failure operation of three-phase asynchronous motor

The three-phase asynchronous motor often burns out when it runs out of phase. The main reason is that the reverse sequence magnetic field produces large braking torque after one-phase power failure, which reduces the output torque of the motor. When the external load remains unchanged, the slip rate increases, and the current in the stator winding is much higher than that in normal operation, resulting in increased copper and iron consumption, resulting in the increase of motor temperature and burning out the stator winding.

Maintenance and management measures of three-phase asynchronous motor in storage

The storage conditions of the motor shall be selected according to its protection grade and the characteristics of the suitable equipment to ensure that the installation size and the quality characteristics of the motor will not deteriorate during the storage of the motor.

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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