Switching method, apparatus, control system, motor, storage medium and compressor

Abstract

The invention provides a switching method and device of a driving circuit, a control system, a motor, a storage medium and a compressor, wherein the switching method of the driving circuit comprises:controlling the input of a zero vector voltage to a multi-phase stator winding when receiving a switching instruction to enable the multi-phase stator winding to enter an input state of the zero vector voltage; in the input state, switching a first stator winding to a second stator winding under control; and when the maintenance duration of the input state is detected to reach the preset durationthreshold, switching the zero vector voltage to a non-zero vector voltage under control. The technical solution of the invention can realize the simultaneous switching of the vector control system andthe multi-phase stator winding form, effectively reduces the problem that the vector control system and the multi-phase stator winding form do not match, further reduces the cause of the phenomenon of magnetic synchronous motor demagnetization due to the abnormality of the vector control system, and is beneficial to improve the stability and reliability of a permanent magnet synchronous motor.

Description

technical field [0001] The present invention relates to the technical field of motor control, in particular, to a switching method of a driving circuit, a switching device of a driving circuit, a vector control system, a permanent magnet synchronous motor, a computer-readable storage medium and A compressor. Background technique [0002] With the development of the economy and society and the gradual improvement of the level of science and technology, the application fields of permanent magnet synchronous motors (PMSM, Permanent Magnet Synchronous Motor) are becoming more and more extensive, and the performance requirements of permanent magnet synchronous motors are also getting higher and higher. [0003] In related technologies, in order to optimize the energy efficiency of permanent magnet synchronous motors in the full frequency band, switching between star-shaped stator windings and delta-shaped stator windings is adopted. In the conventional switching process from star...

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Problems solved by technology

[0003] In related technologies, in order to optimize the energy efficiency of permanent magnet synchronous motors in the full frequency band, switching between star-shaped stator windings and delta-shaped stator windings is adopted. In the conventional switching process from star-shaped stator windings to delta-shaped stator windings, the switching device is in the The time required to complete a disconnection or conduction is different, but if the error deviation is 1ms, it is possible to demagnetize the permanent magnet synchronous motor, which will cause the permanent magnet synchronous motor to increase the main flux at medium and low frequencies, reduce the stator current, and reduce the frequency conversion. Reduce the loss of the transformer and motor, reduce the main flux at high frequency, reduce the problems of low motor power, weak load capacity and low motor efficiency caused by weak magnetic tape

[0004] However, in the actual operation process, the characteristics of each switching device cannot be completely guaranteed to be consistent, resulting in an abnormal vector control system, which in turn causes the problem of motor demagnetization

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