What is AC synchronous motor?

AC synchronous motor is a kind of constant speed driving motor, whose rotor speed and power frequency maintain a constant proportional relationship and is widely used in electronic instrumentation, modern office equipment, textile machinery and so on.

1. Permanent-magnet synchronous motors Permanent-magnet synchronous motors are asynchronous starting permanent-magnet synchronous motors. Their magnetic field system consists of one or more permanent magnets, usually inside a cage-type rotor welded with cast aluminum or copper bars. The poles required are equipped with magnetic poles inlaid with permanent magnets. The stator structure is similar to an asynchronous motor.

When the stator windings are connected to the power source, the motor starts with the asynchronous motor principle and the synchronous electromagnetic torque generated by the permanent magnet magnetic field of the rotor and the stator magnetic field (the electromagnetic torque generated by the permanent magnetic field of the rotor and The reluctance torque generated by the stator's magnetic field) pulls the rotor into synchronization and the motor enters synchronous operation.

Reluctance Synchronous Motor Reluctance Synchronous motors, also known as reactive synchronous motors, are synchronous motors that produce reluctance torques using different rotor reluctances and direct-axis reluctances. The stators of the reluctance synchronous motors are similar to the stators of the asynchronous motors, except for the rotor structure. different.

The reluctance synchronous motor is evolved from the same-cage asynchronous motor. In order to enable the motor to produce asynchronous starting torque, the rotor is also provided with a cage cast aluminum winding. The rotor is provided with a reaction slot corresponding to the number of poles of the stator (only the role of the salient pole portion, the non-excitation winding and the permanent magnet) is used to generate the reluctance synchronous torque. According to the structure of the reaction tank on the rotor, it can be divided into inner reaction type rotor, outer reaction type rotor and inner and outer reaction type rotors, in which the outer reaction type rotor reaction groove opens the outer circle of the rotor to make the straight axis and the co-axial direction. Air gaps range. The inner reaction type rotor is internally grooved so that the flux in the counter-axis direction is hindered and the magnetic resistance increases. The internal and external reactive rotors combine the structural features of the above two types of rotors, and the difference between the straight shaft and the cross shaft is relatively large, so that the motor has a large force. Reluctance synchronous motors are also divided into single-phase capacitive operation type, single-phase capacitive startup type, and single-phase dual-valued capacitive type.

2. Hysteresis Synchronous Motors Hysteresis synchronous motors are synchronous motors that use hysteresis materials to generate hysteresis torque. It is divided into inner rotor type hysteresis synchronous motor, outer rotor type hysteresis synchronous motor and single phase shaded hysteresis synchronous motor.

The rotor structure of the inner rotor type hysteresis synchronous motor is of the hidden pole type, and the appearance is a smooth cylinder, and there is no winding on the rotor, but an effective ring made of hysteresis material is used on the outer circle of the iron core.

After the stator winding is turned on, the rotating magnetic field generated will cause the hysteresis rotor to generate asynchronous torque to start the rotation, and then automatically pull in the synchronous operation state. In the asynchronous operation of the motor, the stator rotating magnetic field repeatedly magnetizes the rotor at the slip frequency; in the synchronous operation, the hysteresis material on the rotor is magnetized and the permanent magnetic pole appears, thereby generating synchronous torque.

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