Driving method and circuit for permanent magnet synchronous motor

Abstract

The invention provides a driving method and circuit for a permanent magnet synchronous motor. The driving circuit for the permanent magnet synchronous motor comprises a driving control module, a current detection module, a power driving module and a magnetic pole position detection module; the driving control module comprises a speed solving unit, a speed control unit, a current control unit, a decoupling variation unit and a sine wave control unit; the current detection module comprises a current detection circuit, a signal conditioning circuit and an analog-digital conversion circuit; the magnetic pole position detection module comprises a magnetic pole position detection sensor and a signal conditioning circuit; through PLL / PID dual-mode control, the problem that the traditional PID controlled motor has the phenomenon of control delay due to time draft in stability can be solved and the stability of the speed of the motor can be improved further.

Description

【Technical field】 [0001] The invention belongs to the technical field of automatic motor control, and relates to a driving method and circuit of a permanent magnet synchronous motor. 【Background technique】 [0002] In the indoor space measurement and positioning system, the sine wave permanent magnet synchronous motor is used to drive the optical electromechanical rotor to provide time difference measurement, and the motor speed stability is the key technical index of the system. [0003] The existing sine wave permanent magnet synchronous motor has the following problems: [0004] 1) The existing sine wave permanent magnet synchronous motor adopts PWM drive control technology. Because PWM control has a high switching frequency, the current of the motor produces higher harmonic changes other than the fundamental wave, thereby causing torque pulsation of the motor rotor. phenomenon, which directly affects the stability of the motor speed; [0005] 2) The existing self-contr...

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Problems solved by technology

[0004] 1) The existing sine wave permanent magnet synchronous motor adopts PWM drive control technology. Due to the high switching frequency of PWM control, the current of the motor produces high-order harmonic changes other than the fundamental wave, thereby causing torque ripple of the motor rotor Phenomenon, directly affect the motor speed stability;

[0005] 2) The existing self-controlled sine wave permanent magnet synchronous motor is mainly designed for the automatic control system. The encoder used in it has only one zero pulse at a mechanical angle of 360°, which cannot eliminate the accumulated error of the engraved line within a whole cycle, resulting in random control. The deviation will affect the stability of the motor speed;

[0006] 3) The existing sine wave permanent magnet synchronous motor usually adopts the PID control strategy, which is mainly designed for the fast response of the automatic control system, but there are obvious deficiencies in the PID control in the steady speed control system. Under the traditional PID control, the motor stability There will be a time drift phenomenon, and there will be a relatively obvious control hysteresis in a short period of time

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