External rotor permanent magnet synchronous motor sensorless control system and control method

Abstract

The invention belongs to a sensorless control system and control method for an outer rotor permanent magnet synchronous motor, and the method comprises the steps: taking the components-psi fsin theta e and psi fcos theta e of a permanent magnet flux linkage in an extended counter electromotive force component in a voltage equation under a two-phase static alpha beta coordinate system under the two-phase static alpha beta coordinate system as the reconstruction components of a sliding-mode observer; the estimated permanent magnet flux linkage component is subsequently sent to a bilinear extended state observer phase-locked loop with a compensation mechanism, and the estimated disturbance is sent to the variable observer coefficient bilinear extended state observer phase-locked loop with the compensation mechanism; the variable observer coefficient bilinear extended state observer phase-locked loop with the compensation mechanism is responsible for estimating the rotor position and estimating the output of the rotating speed. The method can operate in a full operation range including a zero-low speed range, has good dynamic performance and anti-disturbance capability, and can also provide accurate rotor position information under the action of slope disturbance.

Description

technical field [0001] The invention belongs to the field of permanent magnet synchronous motors without position sensors, and in particular relates to a position sensorless control system and control method suitable for the full operating range of an outer rotor permanent magnet synchronous motor, and a maximum torque applying the position sensorless control system and control method. Current ratio control system. Background technique [0002] External rotor permanent magnet synchronous motors are widely used in mining conveyor belts, new energy vehicles, ball mills and other fields due to their high efficiency, energy saving, simple structure, and large starting torque. high, the failure of the sensor will lead to the loss of control of the entire control system, resulting in an increase in cost and a reduction in robustness. To solve the above problems, a position sensorless control algorithm is proposed. The advantages of insensitivity to parameter changes and strong re...

AI Technical Summary

Problems solved by technology

[0015] The present invention provides a position sensorless control system and control method for the full operating range of an outer rotor permanent magnet synchronous motor. poor performance, poor anti-disturbance ability, 180° estimation error in reverse, etc., to realize the sensorless algorithm within the full operating range

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