A detection device and detection method for the rotational speed of a permanent magnet synchronous motor
A technology for permanent magnet synchronous motors and detection methods, applied in the direction of electronic commutation motor control, electrical components, control systems, etc., can solve the problems of difficult real-time and accurate detection of motor speed, and achieve the solution of difficult real-time and accurate detection, good real-time performance, The effect of less motor parameters
Active Publication Date: 2018-10-12
YANGZHOU DAJIN MOTOR MFG
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[0005] Technical problem: The purpose of this invention is to solve the problem that the motor speed 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 method for the speed of the permanent magnet synchronous motor
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[0027] 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.
[0028] Such as figure 1 As shown, a detection device for the rotational speed of a permanent magnet synchronous motor 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 the permanent magnet synchronous motor, wherein the DC voltage The 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 composed of three branches connected in p...
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The invention discloses a rotational speed detection device and detection method 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 of the permanent-magnet synchronous motor according to the phase voltage and a three-phase current, obtained by detection of a current sensor, of the permanent-magnet synchronous motor; and calculating to obtain the rotational speed of the permanent-magnet synchronous motor according to the three-phase reverse potential and a back electromotive force coefficient of the motor. With the detection device and method, the problem that the rotational speed of the motor in closed-loop control of the permanent-magnet synchronous motor is difficult to accurately detect in real time is solved.
Description
technical field [0001] The invention relates to a permanent magnet synchronous motor, in particular to a detection device and a detection method for the rotational speed of a permanent magnet synchronous motor, belonging 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] In the closed-loop control of permanent magnet synchronous motor, the detection of rotational speed has an important influence on the stable operation of the motor. If the speed detection is inaccurate, it will lead to poor speed regulation accuracy of the permanent magnet synchronous motor, poor servo effect, and in severe cases, the permanent magnet syn...
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IPC IPC(8): H02P6/00
Inventor 魏海峰韦汉培
Owner YANGZHOU DAJIN MOTOR MFG