Method for measuring relative rotation angle and relative rotation speed of two rotors of coaxial dual rotor motor and sensor for implementing same

A dual-rotor motor and rotor angle technology, which is applied to devices, measuring devices, and instruments using electric/magnetic methods, can solve problems such as signal lag and measurement result errors, and achieve the effect of suppressing high-frequency noise.

Active Publication Date: 2011-04-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of large error in measurement results and signal lag in the existing measurement method for the angular position of a dual-rotor motor, and to provide a method for measuring the relative rotation angle and rotational speed of two rotors of a coaxial dual-rotor motor and its realization The sensor of the method

Method used

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  • Method for measuring relative rotation angle and relative rotation speed of two rotors of coaxial dual rotor motor and sensor for implementing same
  • Method for measuring relative rotation angle and relative rotation speed of two rotors of coaxial dual rotor motor and sensor for implementing same
  • Method for measuring relative rotation angle and relative rotation speed of two rotors of coaxial dual rotor motor and sensor for implementing same

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specific Embodiment approach 1

[0037] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the method for measuring the relative rotation angle and rotational speed of two rotors of a coaxial dual-rotor motor described in this embodiment,

[0038] Install the first rotary transformer 1-1 and the second rotary transformer 1-2 concentrically on the shafts of the two rotors of the dual-rotor motor respectively, and the rotor angle signal obtained by the first rotary transformer 1-1 is θ 1 , the rotor angle signal obtained by the second resolver 1-2 is θ 2 ;

[0039]The excitation windings of the two rotary transformers input excitation signals of the same frequency and phase: the excitation signal U input by the first rotary transformer 1-1 EXC1 =E 1 cos(ω e t), where E 1 is the amplitude of the excitation signal of the first resolver 1-1, ω e is the angular frequency of the excitation signal, t is the time,

[0040] The excitation signal U input by the second ...

specific Embodiment approach 2

[0080] Specific implementation mode two: the following combination figure 2 Describe this embodiment, this embodiment is a further description of Embodiment 1, the V S1 , V C1 , V S2 and V C2 After coordinate transformation, the obtained ΔU S and ΔU C After low-pass filtering respectively, ignoring the phase shift and attenuation of the low-frequency signal, the expression of the output signal is transformed into:

[0081]

[0082] ΔU' S and ΔU′ C is the carrier-free modulation signal of the relative rotation angle of the two rotors, and then ΔU′ S and ΔU′ C Solve the phase-locked loop circuit.

[0083] In this embodiment, the spectrum shift and coordinate transformation of the signal are completed at the same time, and ΔU S and ΔU C After low-pass filtering respectively, the input signal of the phase-locked loop decoding circuit does not contain high-frequency components of constant frequency, which can improve the robustness of the system.

specific Embodiment approach 3

[0084] Specific implementation mode three: the following combination image 3 This embodiment is described. This embodiment is a further description of Embodiment 1. In this embodiment, the excitation signal is used to shift the frequency spectrum of the output signal to realize the demodulation of four output signals of two resolvers. According to the excitation of two resolvers The signals have the same frequency and phase, and the phase shifts introduced after signal conditioning are equal, then Choose the compensation phase β such that will V S1 , V C1 , V S2 and V C2 After multiplication with the excitation signal with phase shift angle β respectively, we get:

[0085]

[0086]

[0087]

[0088]

[0089] where V' S1 is the signal after the spectrum shift of the sinusoidal winding output signal of the first rotary transformer 1-1, V' C1 is the signal after the cosine winding of the first rotary transformer 1-1 has shifted the frequency spectrum of the ...

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Abstract

The invention discloses a method for measuring the relative rotation angle and the relative rotation speed of two rotors of a coaxial dual rotor motor and a sensor for implementing the same, belongs to the field of motor position detection and solves the problems of large error of a measuring result and signal lagging of the conventional method for measuring the rotation angle position of the dual rotor motor. Two rotary transformers which are arranged to be concentric with the two rotors of the dual rotor motor collect the information of the two rotors; the signals output by the rotary transformers are subjected to signal modulation and analogue to digital (A / D) sampling in turn, input to a coordinate conversion unit and demodulated by a phase-locked loop decoding unit; and thus, the relative rotation angle difference and the relative rotation speed difference between the two rotors of the dual rotor motor are tracked in real time. The method and the sensor are used for measuring the relative rotation angle and relative rotation speed of the two rotors of the coaxial dual rotor motor.

Description

technical field [0001] The invention relates to a method for measuring the relative rotation angle and rotational speed of two rotors of a coaxial double-rotor motor and a sensor for realizing the method, belonging to the field of motor position detection. Background technique [0002] Currently, dual-rotor motors are used in electric vehicles. To implement vector control for a dual-rotor motor, it is necessary to know the angle difference and speed difference of the two rotors. The current method used to measure the angle difference and speed difference of a dual-rotor motor is as follows: Figure 4 As shown, it installs two rotary transformers on the two shafts of the dual-rotor motor respectively. When the rotors of the two rotary transformers rotate with the two shafts of the dual-rotor motor respectively, the amplitude of the AC voltage output by the signal windings of the two rotary transformers will vary with the The angular displacements of the respective rotors chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/30G01P3/46
Inventor 崔淑梅葛浩程远宋力伟
Owner HARBIN INST OF TECH
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