Method for judging magnetic pole polarity of motor rotor

A polarity judgment, motor rotor technology, applied in the direction of electronic commutator, motor control, generator control, etc., can solve the problem of failing to identify the polarity of the magnetic pole, and achieve the effect of fast and accurate acquisition and simple calculation method

Inactive Publication Date: 2018-06-12
SF TECH
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Problems solved by technology

[0004] Using the high-frequency impedance characteristics of permanent magnet synchronous motors to extract the rotor position estimation deviation Δθ input signal Adjust the input signal When approaching zero, there may actu

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  • Method for judging magnetic pole polarity of motor rotor
  • Method for judging magnetic pole polarity of motor rotor

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[0010] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the related invention, but not to limit the invention. In addition, it should be noted that, for the convenience of description, only the parts related to the invention are shown in the drawings.

[0011] It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0012] As described in the background art, the commonly used rotor magnetic pole polarity judgment method needs to be corrected based on the magnetic pole polarity estimated by the pulse vibration high-frequency signal injection method. Injecting...

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Abstract

Provided is a method for judging magnetic pole polarity of a motor rotor. Pulsating high frequency voltage signals are injected into a direct axis, high frequency current response values of the directaxis and a quadrature axis are obtained; according to the response currents of the direct axis and quadrature axis, a first direct axis high frequency current corresponding to a phase shown in the description and a second direct axis high frequency current corresponding to a phase shown in the description are calculated; the magnetic pole polarity of the motor rotor is judged by comparing absolute values of the first direct axis high frequency current and second direct axis high frequency current. According to the method, only the pulsating high frequency voltage signals are injected into thedirect axis, an initial estimated value of the rotor position is obtained through calculation, and it is judged whether the initial estimated value is revised or not. The method is compared with theprior art, multiple injection voltages are not needed to acquire the corresponding parameters, the calculation method is simple, and the magnetic pole polarity of the motor rotor can be quickly and accurately obtained.

Description

technical field [0001] The invention belongs to the field of motor control, and in particular relates to a method for judging the magnetic pole polarity of a motor rotor. Background technique [0002] Due to its simple structure, small size, light weight and high efficiency, the permanent magnet synchronous motor has gradually become a research hotspot in the field of AC speed control transmission. The permanent magnet synchronous motor needs accurate rotor position and speed signals to achieve field orientation and speed control. In the vector control of the sensorless permanent magnet synchronous motor, the initial position of the rotor is a very important quantity. If the initial position is not estimated accurately, Otherwise, the reverse rotation may occur when the motor is started, or the motor may fail to start, and it may also affect the running performance of the system after starting. [0003] The method based on pulse vibration high-frequency signal injection is ...

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Application Information

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IPC IPC(8): H02P21/18H02P21/28H02P6/16
CPCH02P21/18H02P6/18H02P21/28H02P25/03H02P2203/03H02P2203/09H02P2203/11
Inventor 洪为伟
Owner SF TECH
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