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
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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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