On-line compensation method and compensation device for periodic error of resolver
A periodic error and resolver technology, which is applied in the control of electromechanical transmission devices, control of electromechanical brakes, motor generator control, etc., can solve problems such as torque ripple, resolver output signal phase current distortion, etc., to achieve a small amount of calculation, Strong robustness, the effect of solving phase current distortion and torque ripple
Inactive Publication Date: 2020-01-21
HUAZHONG UNIV OF SCI & TECH
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[0004] In view of the defects and improvement needs of the prior art, the present invention provides an online compensation method and compensation device for the periodic error of the resolver, aiming to solve the phase current distortion and torque caused by the periodic error in the output signal of the resolver. Pulsation problem
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[0024] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0025] Before introducing the technical solution of the present invention, a brief introduction to the existing permanent magnet motor control system is firstly given. Such as figure 1 As shown, the existing permanent magnet motor control system includes: speed controller 001, current controller 002, space vector pulse width modulation module 003, permanent magnet synchronous motor 004, current sensor ...
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The invention discloses an online compensation method and an online compensation device for a periodic error of a rotary transformer. The method comprises: detecting a three-phase current of a statorof a motor; performing a Clark coordinate transformation on the three-phase current to obtain an adjustable current vector; obtaining a fundamental current phase of the three-phase current, then obtaining a virtual three-phase current according to the fundamental current phase, and performing the Clark coordinate transformation on the virtual three-phase current to obtain a reference current vector; calculating to obtain the cross product of the adjustable current vector and the reference current vector; performing a proportion-integral operation on the cross product to obtain the amplitude ofthe periodic error; obtaining the position signal theta output by the rotary transformer; calculating to obtain the periodic error of the rotary transformer according to the amplitude of the periodicerror, and subtracting the periodic error from the position signal theta to obtain the compensated rotor position. The invention is capable of effectively compensating the periodic error of the rotary transformer on-line, thereby solving the phase current distortion and torque ripple problem caused by the periodic error.
Description
Technical field [0001] The invention belongs to the field of permanent magnet motor position sensor signal correction, and more specifically relates to an online compensation method and a compensation device for the periodic error of a resolver. Background technique [0002] In industrial applications such as electric vehicles, the demand for Permanent Magnet Synchronous Motor (PMSM) is growing rapidly. The field-oriented control (FOC) technology of permanent magnet motors has excellent performance and is widely used. The magnetic field orientation technology requires precise rotor position, which places higher requirements on the position sensor. Resolver, as a common position sensor, has good robustness, high reliability, and can suppress common mode noise, so it is widely used, especially in harsh working environments. [0003] Due to the non-linear characteristics of the resolver itself, the position signal provided to the motor contains various errors. These position errors...
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IPC IPC(8): H02P21/18H02P21/14
CPCH02P21/14H02P21/18
Inventor 陈东东李健陈俊桦曲荣海
Owner HUAZHONG UNIV OF SCI & TECH