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A method for detecting the initial position of a permanent magnet motor rotor

A rotor initial position, rotor position technology, applied in the direction of motor, control generator, motor generator control, etc., can solve the problems of increasing system complexity and implementation difficulty, to avoid repeated trial and error process, improve detection speed, improve efficiency effect

Active Publication Date: 2022-05-31
BEIHANG UNIV
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Problems solved by technology

The accuracy of the high-frequency current injection method is not affected by the nonlinearity and dead zone of the inverter, but the current controller needs to have sufficient bandwidth and precision to track the high-frequency current signal. In addition, an additional voltage sensor needs to be added to increase the The complexity and implementation difficulty of the system

Method used

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  • A method for detecting the initial position of a permanent magnet motor rotor
  • A method for detecting the initial position of a permanent magnet motor rotor
  • A method for detecting the initial position of a permanent magnet motor rotor

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Embodiment Construction

[0036] The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] like figure 1 As shown, establish a two-phase stationary coordinate system α-β, an actual rotor synchronous rotating coordinate system d-q and an estimated rotor synchronous rotating coordinate system where the angle between the d axis and the α axis is the actual rotor position θ e , The angle between the axis and the alpha axis is the estimated rotor position and

[0038] like figure 2 As shown, the method for detecting the initial position of the permanent magnet motor rotor of the present invention includes the following steps:

[0039] Step A) Initial estimation of rotor position: towards the estimated The shaft injects a high-frequency carrier voltage, which is acquired by The carrier current of the shaft and closed-loop control to achieve the initial estimation of the rotor position;

[0040] Step B) Disc...

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Abstract

The invention discloses a method for detecting the initial position of a permanent magnet motor rotor, which belongs to the technical field of permanent magnet motor control and consists of three parts: initial rotor position estimation, rotor magnetic pole direction discrimination, and compensation for the initial rotor position estimation. Firstly, a high-frequency carrier voltage is injected into the estimated d-axis, and the initial estimation of the rotor position is realized by collecting the estimated q-axis carrier current and performing closed-loop control. After the initial estimation of the rotor position is completed, the magnitude of the carrier current is detected by discrete Fourier transform to determine the direction of the rotor magnetic pole. Finally, the initial estimated value of the rotor position is compensated according to the discriminant result of the rotor magnetic pole direction, and the initial position detection of the rotor is realized. The invention realizes the integration of the initial estimation of the rotor position and the rotor magnetic pole direction discrimination algorithm, the detection algorithm is simple, and has the advantages of fast detection speed and high reliability.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a method for detecting the initial position of a permanent magnet motor rotor. Background technique [0002] Permanent magnet motors have the advantages of compact structure, high power density, good dynamic performance and high efficiency, and have been widely used. Real-time rotor position feedback is essential to achieve high-precision control of permanent magnet motors. The continuous rotor position information is usually obtained by using photoelectric encoders, resolvers and linear Hall sensors, and discrete rotor position information is obtained by switching Hall sensors. However, these mechanical sensors may face the problems of difficult installation, difficult wiring, and poor reliability. Therefore, sensorless control has become an effective way to solve these problems. When the motor runs at medium or high speed, the position information of the rotor can be extracted by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P21/18H02P21/22H02P25/02
CPCH02P21/14H02P21/18H02P21/22H02P25/02Y02T10/64
Inventor 张海峰李海涛毛琨陈宝栋金浩郑世强
Owner BEIHANG UNIV
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