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

CN108155842AInactive Publication Date: 2018-06-12SF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-06-12
Estimated Expiration
Not applicable · inactive patent

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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.
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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 ...

Examples

Embodiment Construction

[0010] The application 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 related inventions, rather than to limit the invention. It should also be noted that, for ease of description, only parts related to the invention are shown in the drawings.

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

[0012] As mentioned in the background technology, the commonly used rotor magnetic pole polarity judgment method needs to correct the magnetic pole polarity estimated based on the pulse vibration high-frequency signal injection method. The existing correction method needs to inject different forms ...