A control method for optimal efficiency tracking of sensorless permanent magnet synchronous motor

Abstract

The invention discloses a control method for the optimal efficiency tracking of a sensorless permanent magnet synchronous motor, and the method comprises the following steps: S1), carrying out the first-adding second-subtracting operation or first-subtracting second-adding operation of a compensation variable on the basis of an initial variable; S2), carrying out the tracking adjustment of the initial variable at step S1) according to the corresponding change of motor power after first-adding second-subtracting operation or first-subtracting second-adding operation, and enabling the initial variable after the adjustment to be serve as the initial variable of the next adjustment; S3), returning to step S1) and step S2) for the next time, wherein the initial variable is a d-axis current instruction or a rotor position estimated angle of a motor. The method solves the technical problems of tedious characteristic calibration testing, low frequency caused by a parameter measurement error or variation during the fixed-type estimated angle compensation and poor robustness of a system, and also can meet the requirements of constant-speed operation of the motor.

Description

technical field [0001] The invention belongs to the field of motor control, and relates to a control method of a sensorless permanent magnet synchronous motor, in particular to a control method for optimal efficiency tracking of a sensorless permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors usually use MTPA (Maximum Torque-to-Ampere Ratio) control to achieve optimal efficiency operation. For the hidden pole machine, this method makes the d-axis current I d =0 to reduce the current amplitude under the premise of meeting the torque requirement, thereby reducing the copper loss of the motor, but this method ignores the iron loss of the motor, so I d = 0 is not the optimal point of the efficiency of the hidden pole machine; but for the salient pole machine, obviously I d = 0 is not a control method with optimal efficiency, because the salient pole machine has an I corresponding to the optimal motor efficiency under different ...

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Problems solved by technology

[0006] In view of this, the object of the present invention is to propose a control method for optimal efficiency tracking of a sensorless permanent magnet synchronous motor, which avoids the cumbersome characteristic calibration test in the prior art and the parameter measurement error when using fixed estimation angle compensation Under the premise of technical problems such as efficiency reduction and poor system robustness caused by changes or changes, it can meet the requirements of motor constant speed operation at the same time

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