Power compensation type rare earth permanent magnet motor and control method

Abstract

The invention relates to a power compensation type rare earth permanent magnet motor and a control method. The power compensation type rare earth permanent magnet motor comprises a shell and a power compensation assembly arranged at the top of the shell. A plurality of stators are arranged on the inner wall of the shell, the stators are distributed around the inner wall of the shell at intervals, and excitation coils are arranged on the outer sides of the stators; a rotor is connected in the shell in a matched mode in the center line direction, magnetic steel is arranged at one end of the rotor, and a plurality of permanent magnets are arranged on the outer side of the magnetic steel at intervals in the circumferential direction. The power compensation assembly comprises a first compensator and a second compensator, the first compensator and the second compensator are both connected with a current detection mechanism, the first compensator is matched with the second compensator, and a switching mechanism is arranged between the first compensator and the second compensator; the switching mechanism can gate the first compensator or/and the second compensator to operate; and a correction unit is arranged in the power compensation assembly, and the correction unit is provided with a power input end and a power output end.

Description

technical field [0001] The invention relates to a rare earth permanent magnet motor, in particular to a power compensation type rare earth permanent magnet motor and a control method. Background technique [0002] With the development of science and technology, various fields of industry in our country have made rapid progress. Due to the advantages of high efficiency, high precision and good quality, permanent magnet synchronous motors are now used as core power components in many aspects, and in many environments. Therefore, the stability of the motor operation is very important. At present, the electrolytic capacitors used to control the permanent magnet motor have short life, poor reliability and low system power factor. Dynamic compensation is carried out in the middle, so that the permanent magnet motor still has a high power factor when it is continuously in a high-load operation state, ensuring safe and efficient operation of the motor. [0003] Most of the traditio...

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Problems solved by technology

[0002] With the development of science and technology, various fields of industry in our country have made rapid progress. Due to the advantages of high efficiency, high precision and good quality, permanent magnet synchronous motors are now used as core power components in many aspects, and in many environments. Therefore, the stability of the motor operation is very important. At present, the electrolytic capacitors used to control the permanent magnet motor have short life, poor reliability and low system power factor. Dynamic compensation is carried out in the middle, so that the permanent magnet motor still has a high power factor when it is continuously in a high-load operation state, ensuring the safe and efficient operation of the motor

[0003] Most of the traditional rare earth permanent magnet motors drive the permanent magnet motor through a matrix converter to adjust the speed, changing the input reactive power factor. During the adjustment process, it is easy to have a speed adjustment delay and adjustment deviation, resulting in the motor running state always being in the system. In the hysteresis zone of the adjustment, the adjustment signal has hysteresis. In addition, in the process of power compensation, it is impossible to perform multi-level compensation and real-time dynamic compensation by monitoring the operating power of the system, and the compensation effect is poor.

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