Permanent magnet synchronous motor starting and rotor position self-correcting method

A permanent magnet synchronous motor and rotor position technology, which is applied in the direction of controlling electromechanical transmission devices, electronic commutators, starting devices, etc., can solve the problems of high-frequency chattering, long time-consuming rotor positioning, etc., and eliminate the cumulative positioning deviation , shorten the positioning time, and realize the effect of zero speed and constant torque starting

Active Publication Date: 2020-03-24
QUANZHOU INST OF EQUIP MFG
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

This method also has a step-by-step approach, which makes rotor positioning time-consuming and high-frequency chattering

Method used

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  • Permanent magnet synchronous motor starting and rotor position self-correcting method
  • Permanent magnet synchronous motor starting and rotor position self-correcting method

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Embodiment Construction

[0028] The general idea of ​​the technical solution in the embodiment of the application is as follows:

[0029] When starting the permanent magnet synchronous motor, the current position of the rotor is used as the orientation reference of the d-axis to directly control the motor speed or torque, and at the same time measure the stator current of the permanent magnet synchronous motor and calculate the current vector in the two-phase stationary coordinate system , combined with the current stator voltage vector to calculate the active power and reactive power consumed by the motor; judge whether the motor starts successfully according to the current rotation of the rotor and the set rotation; calculate the real d-axis and q-axis current of the motor according to the motor state equation, And thereby obtain the angular deviation of the rotor position, and then perform linear or nonlinear smooth compensation on the rotor position according to the angular deviation.

[0030] Ple...

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Abstract

The invention provides a permanent magnet synchronous motor starting and rotor position self-correcting method in the field of motor control, and the method comprises the steps: S10, setting the rotating speed setting and rotating direction of a motor, taking the current position of a rotor as the orientation reference of a d axis, and starting a permanent magnet synchronous motor; S20, judging whether the motor is successfully started or not according to the current rotating direction of the rotor and the set rotating direction; S30, after the starting is successful, after the motor is started, measuring a stator current of the motor and calculating a current vector under a two-phase static coordinate system; and calculating active power and reactive power consumed by the motor in combination with the voltage vector of the current stator, and calculating real d-axis and q-axis currents of the motor according to a motor state equation, thereby obtaining angular deviation of the rotor position, and further correcting the rotor position. The method has the advantages that the consumed time of rotor positioning can be shortened, the positioning steps are simplified, the rotor positioning precision is improved, and meanwhile the accumulated positioning deviation of the rotor in the running process of the motor is eliminated.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a permanent magnet synchronous motor starting and rotor position self-correction method. Background technique [0002] In a servo system that uses an incremental encoder to measure the rotor position of a permanent magnet synchronous motor, the initial position of the rotor needs to be obtained in advance when the permanent magnet synchronous motor starts. [0003] The accuracy of the initial position of the rotor not only affects the control accuracy of the servo system, but also affects the operation stability of the permanent magnet synchronous motor, which in turn determines the overall control performance of the system. If the error between the estimated rotor position and the actual rotor position is too large, the rotor will reverse or the control will fail, which will lead to the instability of the control of the permanent magnet synchronous motor. In addition, during the op...

Claims

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Application Information

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IPC IPC(8): H02P21/34H02P21/32H02P21/18H02P6/20H02P6/16
CPCH02P6/16H02P6/20H02P2203/03H02P21/18H02P21/32H02P21/34
Inventor 夏安俊汪凤翔解伟于新红陶鹏
Owner QUANZHOU INST OF EQUIP MFG
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