A detection device and detection method for stator flux linkage of permanent magnet synchronous motor
A technology of permanent magnet synchronous motor and stator flux linkage, which is applied in the direction of electronically commutated motor control, electrical components, control systems, etc., can solve the problems of difficult real-time and accurate detection of motor stator flux linkage, and achieve simple structure, good real-time performance, The effect of small amount of calculation
Active Publication Date: 2018-09-11
天津林元机械设备有限公司
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[0005] Technical problem: The purpose of this invention is to solve the problem that the motor stator flux linkage is difficult to detect accurately in real time in the closed-loop control of the permanent magnet synchronous motor, and propose a detection device and detection method for the stator flux linkage of the permanent magnet synchronous motor
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[0032] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0033] Such as figure 1 As shown, a detection device of a permanent magnet synchronous motor stator flux linkage of the present invention includes a DC voltage source, a three-phase full-bridge inverter and a high-resistance resistor for detecting the opposite potential of a permanent magnet synchronous motor, wherein, The DC voltage source is connected to the three-phase full-bridge inverter to provide power for the three-phase full-bridge inverter, and the midpoint of the DC voltage source is grounded; the three-phase full-bridge inverter is formed by parallel connection of three branches , ...
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The invention discloses a detection device and detection method for a stator flux linkage of a permanent-magnet synchronous motor. The device comprises a DC voltage source, a three-phase full-bridge inverter, a high-resistance resistor and a permanent-magnet synchronous motor, wherein the DC voltage source is used for supplying power to the three-phase full-bridge inverter, the three-phase full-bridge inverter is connected with the permanent-magnet synchronous motor, a middle point of the DC voltage source is grounded, and a neutral point of the permanent-magnet synchronous motor is grounded via the high-resistance resistor. The method comprises the following steps of detecting to obtain voltages at the two ends of the high-resistance resistor as the voltage of a neutral point of the permanent-magnet synchronous motor; determining an end voltage of the permanent-magnet synchronous motor, and subtracting the voltage of the neutral point from the end voltage to obtain a phase voltage; calculating to obtain a three-phase reverse potential according to the phase voltage and a three-phase current; carrying out integration on the three-phase reverse potential to obtain a three-phase permanent-magnet flux linkage; calculating to obtain a three-phase stator flux linkage according to the three-phase permanent-magnet flux linkage and the phase current; and synthesizing a three-phase stator flux linkage vector to obtain the stator flux linkage of the permanent-magnet synchronous motor.
Description
technical field [0001] The invention relates to a permanent magnet synchronous motor, in particular to a detection device and a detection method for a permanent magnet synchronous motor stator flux linkage, and belongs to the field of permanent magnet synchronous motor control. Background technique [0002] The permanent magnet synchronous motor has many advantages such as simple structure, high power density, and simple control. In recent years, permanent magnet synchronous motors have been increasingly widely used in industrial fields such as high-performance speed regulation systems and servo control systems. [0003] Accurate detection of stator flux linkage is an important part of permanent magnet synchronous motor control system. The stator flux linkage affects the selection of the space voltage vector, that is, it may not be possible to accurately determine the sector where the flux linkage is located due to observation errors. Therefore, the accurate detection of t...
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IPC IPC(8): H02P6/182
Inventor 魏海峰韦汉培
Owner 天津林元机械设备有限公司
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