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A Position Sensorless Control Method Based on Phase Voltage Measurement of Permanent Magnet Synchronous Motor

A technology of permanent magnet synchronous motor and control method, applied in motor control, motor generator control, electronic commutation motor control, etc., can solve the problems of error electromagnetic torque, speed pulsation, etc., reduce position error, improve system performance effect

Active Publication Date: 2021-02-26
杭州领芯微电子有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In position sensorless control, the use of command voltage will cause errors in the estimated position, electromagnetic torque, and rotational speed pulsation

Method used

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  • A Position Sensorless Control Method Based on Phase Voltage Measurement of Permanent Magnet Synchronous Motor
  • A Position Sensorless Control Method Based on Phase Voltage Measurement of Permanent Magnet Synchronous Motor
  • A Position Sensorless Control Method Based on Phase Voltage Measurement of Permanent Magnet Synchronous Motor

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the accompanying drawings.

[0052] refer to Figure 1-Figure 3 , a position sensorless control method based on phase voltage measurement of a permanent magnet synchronous motor, the control method comprising the following steps:

[0053] Step 1, the filtered three-phase voltage is sampled in real time through the voltage measurement circuit, the process is as follows:

[0054] 1.1 The three terminal voltages composed of line voltage and common mode voltage are expressed as follows

[0055]

[0056] where u aNmeas , u bNmeas , u cNmeas is the three-phase terminal voltage, u an , u bn , u cn is the three-phase line voltage, u nN is the common-mode voltage;

[0057] 1.2 The two phase voltages on the αβ coordinates are calculated by Clarke transformation

[0058]

[0059] where u aNmeas , u bNmeas , u cNmeas is the three-phase terminal voltage, u αmeas , u βmeas Phase voltage measu...

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Abstract

A position sensorless control method based on phase voltage measurement of a permanent magnet synchronous motor, comprising the following steps: step 1, real-time sampling of the filtered three-phase voltage through a voltage measurement circuit; step 2, calculation of amplitude and phase compensation for the measured voltage ; Step 3, using position sensorless control based on effective flux linkage model. Aiming at the large difference between the command voltage and the actual voltage of permanent magnet synchronous motor, a direct measurement method of phase voltage is designed, and the amplitude attenuation and phase lag caused by the introduction of LPF are compensated. Then the measured voltage is applied to the position sensorless control based on the effective flux linkage model and the corresponding minimum order observer is designed, which effectively reduces the position error and improves the system performance.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motor control, and relates to a position sensorless control method based on permanent magnet synchronous motor phase voltage measurement. Background technique [0002] In recent years, with the development of power electronics technology and rare earth materials, permanent magnet synchronous motor (PMSM) has been widely used in industrial automation, aerospace and people's daily life. High-performance permanent magnet synchronous motor speed control system needs rotor position and speed signals to realize speed closed-loop control. Although these signals can be accurately detected by mechanical sensors, mechanical position sensors are expensive and mechanically bulky, reducing system reliability. In the fields of high-reliability motor drive systems such as aerospace, due to their own space constraints, the installation of position or speed sensors not only increases the weig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/18
CPCH02P2203/09H02P21/18
Inventor 吴春赵宇纬孙明轩
Owner 杭州领芯微电子有限公司