Method for detecting position of low-noise low-frequency pulsating signal injected into rotor of permanent magnet motor
A rotor position, permanent magnet motor technology, applied in the control of generators, motor generators, AC motors, etc., can solve the problems of torque impact, reduce the dynamic response ability of the system, and destroy the continuity of the closed-loop adjustment of the system. Effect of Noise Cancellation
Pending Publication Date: 2021-11-30
苏州溯驭技术有限公司
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However, such discrete pulse signal injection will cause a torque shock
In addition, in order to realize the extraction of the pulse signal, the system loop control will be interrupted, which will destroy the continuity of the closed-loop adjustment of the system and reduce the dynamic response capability of the system
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[0057] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0058] Such as Figures 1 to 6 The detection method of injecting low-noise and low-frequency pulse vibration signals into the rotor position of permanent magnet motors, which is unique, includes the following steps:
[0059] Step 1: Inject a low-frequency voltage signal in the rotating coordinate system, and learn the injected voltage amplitude adaptively according to the response current amplitude. During implementation, to reduce noise, it is recommended to limit the signal frequency to within 50Hz. Specifically, a low-frequency voltage signal is injected into the rotating synchronous coordinate system, and the amplitude of the injected voltage signal needs to be adapt...
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The invention relates to a method for detecting the position of a low-noise low-frequency pulsating signal injected into a rotor of a permanent magnet motor. A low-frequency voltage signal is injected into a rotating coordinate system, a voltage amplitude is injected in a self-adaptive learning manner according to a response current amplitude, the last injected voltage amplitude is recorded as Vinj, and in the observed rotating coordinate system, low-frequency pulsating voltage is injected into the axis of the coordinate system, output current is sampled, response current amplitude is extracted, rotor angle information contained in low-frequency response current is obtained through an observer, rotor speed is obtained, rotor position information is obtained through algorithm extraction, closed-loop control is achieved, and rotor position information is obtained. On the premise of ensuring continuity and stability of system loop control, rotor position information of the permanent magnet motor is extracted, noise caused by traditional high-frequency signal injection is eliminated, and low-noise permanent magnet motor signal injection position sensorless control is realized.
Description
technical field [0001] The invention relates to a detection method for the rotor position of a permanent magnet motor, in particular to a detection method for injecting a low-noise and low-frequency pulse vibration signal into the rotor position of a permanent magnet motor. Background technique [0002] At present, the effective solution for low-speed sensorless control of permanent magnet synchronous motors conventionally used is the high-frequency injection scheme, and three schemes are routinely used: 1. High-frequency rotation injection scheme; 2. High-frequency pulse vibration injection scheme; 3. High-frequency injection scheme Square wave injection scheme. [0003] Specifically, in the case of low-speed or zero-speed operation of the permanent magnet motor, the prior art realizes rotor position extraction by injecting a high-frequency voltage signal inside the motor. The main difference between it and the solution of the present invention is that the characteristics ...
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Login to View More IPC IPC(8): H02P21/13H02P21/14H02P21/18H02P21/24H02P25/022H02P27/12
CPCH02P21/13H02P21/14H02P21/18H02P21/24H02P25/022H02P27/12H02P2207/05
Inventor周洪雷董震董清华王品贺郭晓宇
Owner苏州溯驭技术有限公司