Method for detecting magnetic pole position of permanent magnet synchronous motor rotor based on displacement sensor
A technology of permanent magnet synchronous motor and displacement sensor, applied in the direction of electronic commutator, etc., which can solve the problems of high cost, impact, and unsuitability for high-speed application of permanent magnet synchronous motors
Inactive Publication Date: 2011-11-09
NANJING CIGU TECH CORP LTD +1
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Problems solved by technology
However, the cost of permanent magnet synchronous motors with such position sensors is relatively high, and the performance of the sensors is easily affected by harsh environments such as high temperature and humidity, which also affects the promotion and use of permanent magnet synchronous motors.
In addition, this kind of sensor is generally installed on the rotor. Due to the limitation of centrifugal force and resolution, it is generally not suitable for high-speed applications.
In order to solve the application at high speed and reduce the cost, the identification method is widely used at home and abroad to determine the angular position of the rotor without sensors, but the accuracy of identification is not as high as that of the sensor, which also affects the performance of permanent magnet synchronous motors.
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[0021] Below in conjunction with accompanying drawing, the present invention will be further described.
[0022] The implementation of this measurement method is mainly divided into two steps:
[0023] First, the initial position of the rotor poles is measured. The displacement sensor is installed as figure 1 As shown, a displacement sensor 2 is installed on the rotor 1 of the motor. Its function is to detect the distance between it and the surface of the rotor 1. If the distance changes, the output signal of the displacement sensor 2 will also change accordingly. Grooving on the surface of the rotor 1 means machining a rotor groove 3 whose width and depth can be identified by the displacement sensor 2 on the rotor 1 . Whenever the rotor groove 3 of the rotor 1 rotates to the position where the displacement sensor 2 is installed, which is equivalent to a displacement jump at the detection point of the displacement sensor 2, the output of the displacement sensor 2 will genera...
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The invention discloses a method for detecting the magnetic pole position of a permanent magnet synchronous motor rotor based on a displacement sensor, belonging to the methods for detecting the magnetic pole positions of permanent magnet synchronous motor rotors. The method is characterized by determining the position of the rotor by slotting the rotor and detecting the slot position with the displacement sensor. The method comprises the following steps: in static state, calibrating the initial position of the rotor by giving the current vector with fixed angle and then leading the rotor to the synchronous state by a control method of loop opening; and after stabilization, evaluating the position of the rotor in real time by a method of angle stacking based on the previously calibrated initial position for the closed-loop control algorithm. The method not only saves cost but also has no impact on the reliability of the system and is higher in measurement accuracy.
Description
technical field [0001] The invention discloses a method for detecting the magnetic pole position of a rotor of a permanent magnet synchronous motor based on a displacement sensor, which belongs to the detection method of the magnetic pole position of a rotor of a permanent magnet synchronous motor. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM-Permanent Magnet Synchronous Motor) combines the advantages of DC motors and AC motors: it can not only obtain control characteristics similar to DC motors, but also has high torque / inertia ratio, high power density, high efficiency, and firmness. and good maintainability. Permanent magnet synchronous motors are also widely used in some high-performance speed control and servo systems because of these advantages. In recent years, with the improvement of the performance of permanent magnet materials, the development of power electronics technology and the emergence of high-performance microprocessors, permanent...
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IPC IPC(8): H02P6/16
Inventor 董继勇徐龙祥纪历
Owner NANJING CIGU TECH CORP LTD