Motor rotor position detecting method and device

A technology of a motor rotor and a detection method, which is applied to measurement devices, electrical devices, electromagnetic means, etc., can solve the problems of poor frequency selectivity of AC excitation excitation signals and detection signals, achieve flexible and diverse spatial layout, and eliminate magnetic fields. Hysteresis loss, good frequency selectivity

Active Publication Date: 2018-09-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) The frequency selectivity of AC excitation excitation signal and detection signal is not strong, and it is easy to be interfered by harmonics;

Method used

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  • Motor rotor position detecting method and device
  • Motor rotor position detecting method and device
  • Motor rotor position detecting method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as image 3 As shown, in this embodiment, one primary side is set to establish the excitation magnetic field, and the two secondary sides are arranged orthogonally. The primary side and the secondary side are coupled by air and have no iron core. The mutual inductance between sides varies with the rotor position in a sine and cosine manner, respectively.

[0032] The compensation circuits of the primary side and the secondary side are designed as series compensation, and the resonant frequencies of the primary side and the secondary side are designed to be equal, calculated as:

[0033]

[0034] Among them, L is the self-inductance of the coil, C is the capacitance of the series compensation circuit, and the loop impedance is the internal resistance R of the coil at this time.

[0035] Apply an AC simple harmonic excitation voltage U with a constant amplitude to both ends of the primary circuit x , and keep U x The frequency f is equal to the resonant frequen...

Embodiment 2

[0049] Such as Figure 5 As shown, in this embodiment, one primary side is set to be consolidated with the base, and the two secondary sides are arranged orthogonally. The coils of the primary side and the secondary side are both wound on the stator core; Work in resonance state. Circuit resonance can realize frequency selective amplification, which can improve the detection effect.

[0050] The rotor core is set to rotate synchronously with the rotor, and the rotor core is uneven and sinusoidal in radial direction.

[0051] Obviously, as the rotor rotates, the air gap between the stator and rotor cores changes periodically, thereby changing the reluctance of the mutual inductance magnetic circuit of the primary and secondary windings and the mutual inductance between the primary and secondary windings.

[0052] Considering the combined action of the compensation circuit and the excitation voltage, the excitation voltage of the primary coil S:

[0053] u x =Esin(2πft)

[...

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PUM

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Abstract

The invention relates to a motor rotor position detecting method and device. The device comprises at least one primary side coil and at least two auxiliary side coils, the primary side coil and the auxiliary side coils are electrically connected with compensating circuits respectively to form a resonance circuit with the specific resonance frequency, the resonance frequencies of the coils are consistent, magnetic coiling resonant wireless electric transmission between the primary and auxiliary side coils is achieved, the primary and auxiliary side coils work under the quasi resonant state or the resonant state, and the motor rotor position is detected through changes of the inductance between the primary and auxiliary side coils. Compared with the prior art, the device has the advantages of being good in frequency selectivity, high in interference resistance, flexible and varied in spatial arrangement, high in precision and the like.

Description

technical field [0001] The invention belongs to the field of motor and control technology, and relates to a motor rotor position detection method and detection device, in particular to a motor rotor position detection method and detection device based on the principle of magnetic coupling resonance wireless power transmission. Background technique [0002] Motor position detection is an important part of motor control. [0003] In the current motor position detection, the resolver is one of the most important forms, such as figure 1 shown. The resolver is generally equipped with a primary excitation winding and several (generally two sine and cosine) secondary detection windings. The magnetic permeability between the excitation winding and the detection winding changes with the change of the motor rotor, thereby causing the mutual inductance between the two to change. . In this way, as the rotor rotates, the amplitude of the induced electromotive force on the secondary si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/30
CPCG01B7/30
Inventor 钟再敏康劲松刘宇松胡程宇孙梁榕
Owner TONGJI UNIV
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