Closed-loop phase compensation control method and device for multiphase permanent magnet synchronous motor

Abstract

The invention discloses a closed-loop phase compensation control method and device for a multiphase permanent magnet synchronous motor. According to the closed-loop phase compensation control method and device, the mathematical relationship between a conventional voltage d-q component and an actual voltage d-q component of a closed-loop system is established according to the mathematical relationship between the conventional voltage d-q component in each harmonic plane based on an open-loop voltage given algorithm and the reference voltage vector, and thus the mathematical relationship betweenthe conventional voltage alpha-beta component and the actual voltage d-q component is obtained. In the multiphase permanent magnet synchronous motor, a phase compensation angle phi is introduced, during pulse width modulation of each harmonic plane algorithm, motor actual feedback angles theta <r> are overlapped, and thus the influence of the actual voltage d-q component magnitude and symbolic relation on U<alpha beta> is compensated. According to the closed-loop phase compensation control method and device, an open-loop voltage given mode of a traditional algorithm is expanded to a closed-loop d-q voltage tracking mode.

Description

technical field [0001] The invention belongs to the field of AC motor and drive control, and more specifically relates to a closed-loop phase compensation control method and device for a multi-phase permanent magnet synchronous motor. Background technique [0002] Multi-phase systems with more than 3 phases have the advantages of low-voltage devices to achieve high power, good torque performance, and phase-loss fault-tolerant operation, making them popular in high-power and high-reliability industrial applications with limited voltage. The superior controllability of permanent magnet motors enables them to be used in more and more industrial scenarios. Multiphase permanent magnet synchronous motor has the advantages of good controllability of permanent magnet motor and high reliability of multiphase motor, so it has broad application prospects. At present, most multi-phase permanent magnet synchronous motors use fundamental sinusoidal power supply, which does not give full ...

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Problems solved by technology

[0011] Aiming at the above defects or improvement needs of the prior art, the present invention provides a closed-loop phase compensation control device and method for a multi-phase permanent magnet synchronous motor, thereby solving the difficulty in expanding the open-loop voltage vector given algorithm in the prior art to improve multi-phase Issues such as iron core utilization, output torque and power density of permanent magnet synchronous motors

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