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Permanent magnet motor square wave injection position sensorless control method based on oversampling

A technology of permanent magnet motor and control method, which is applied in the direction of motor control, motor generator control, electronic commutation motor control, etc., and can solve problems such as poor control effect

Pending Publication Date: 2020-06-05
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

However, when the traditional high-frequency square wave signal is injected into the permanent magnet synchronous motor, when the high-frequency response current is obtained, the high-frequency response current of the nonlinear change is approximated as a linear change. Although the motor can run normally, the control not effectively

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  • Permanent magnet motor square wave injection position sensorless control method based on oversampling
  • Permanent magnet motor square wave injection position sensorless control method based on oversampling
  • Permanent magnet motor square wave injection position sensorless control method based on oversampling

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Embodiment Construction

[0060] The oversampling-based permanent magnet motor square wave injection position sensorless control method of the present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.

[0061] like figure 1 As shown, the permanent magnet motor square wave injection position sensorless control method based on oversampling of the present invention includes:

[0062] 1) Speed ​​control loop 1, the operation is as follows: set the reference speed value and the rotational speed value ω obtained by the rotor position calculation unit 10 e Subtract, and then obtain the reference electromagnetic torque value T through the speed loop PI regulator e , and then obtain d from the Maximum Torque Per Ampere (MTPA for short) module 2 e ,q e Reference current in axis two-phase rotating coordinates and where d e ,q e The axis is based on the rotor position angle θ calculated by the phase-locked loop module 10 e (electrical angle) ...

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Abstract

According to a permanent magnet motor square wave injection position sensorless control method based on oversampling, a high-frequency square wave signal is injected into a de axis, and rotor positioninformation is obtained through PLL according to the relation between high-frequency response current in a winding and a rotor position angle theta e. The period of a position angle is shortened, thespeed of updating the position angle is higher, and the current change at the two ends of the effective vector is in linear change, so that when the position angle is calculated, the model is more accurate, and the obtained position angle is more accurate. The method is simple in algorithm, free of a filter in the implementation process and easy to implement, the accuracy of motor rotor positiondetection can be effectively improved, the initial position information of the rotor can be accurately detected, and the system response frequency is improved. When the rotating speed is high, the calculation precision of the rotor position is higher, the speed range of the motor under the condition of no position sensor operation is improved, and the rotating speed range is broadened. When a large load is suddenly added, the rotating speed fluctuation is smaller, and the dynamic performance of the system is improved.

Description

technical field [0001] The invention relates to the control of a permanent magnet synchronous motor. In particular, it relates to an oversampling-based permanent magnet motor square wave injection position sensorless control method suitable for rotor position detection of permanent magnet synchronous motors normally running at low speeds and position sensorless control in low speed ranges. Background technique [0002] Permanent magnet synchronous motor (Permanent magnet synchronous motor, PMSM) is more and more widely used in the industrial field, especially in the fields of CNC machine tools, industrial robots, aerospace, etc. application. The position sensor can provide the rotor position signal for the permanent magnet synchronous motor, but it increases the volume of the system, is easily affected by the environment, and has disadvantages such as high price, which brings inconvenience to the use of permanent magnet synchronous motor control. Therefore, the position se...

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Application Information

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IPC IPC(8): H02P21/32H02P21/18H02P6/18
CPCH02P21/32H02P21/18H02P6/183H02P2203/03H02P2203/11
Inventor 王志强王朝阳夏长亮陈炜姚波
Owner TIANJIN POLYTECHNIC UNIV
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