An Online Compensation Method for Periodic Error in Resolver Output Signal
A periodic error, resolver technology, used in the control of electromechanical brakes, motor generator control, control of electromechanical transmissions, etc. High compensation accuracy and the effect of solving phase current distortion and torque ripple
Inactive Publication Date: 2020-02-14
HUAZHONG UNIV OF SCI & TECH
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[0004] In view of the above defects or improvement needs of the prior art, the present invention provides an online compensation method for periodic errors in the output signal of the resolver, aiming to solve the phase current distortion and rotation caused by the periodic error in the output signal of the resolver. Torque ripple problem
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[0025] 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.
[0026] 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 on-line compensation method for periodic error in the output signal of a resolver, and belongs to the signal correction field of a position sensor of a permanent magnet motor. The method includes detecting motor stator three-phase current; performing Clark coordinate transformation of that three-phase current to obtain an adjustable current vector; obtaining the fundamental current phase of the three-phase current, obtaining the virtual three-phase current, and obtaining the reference current vector by Clark coordinate transformation of the virtual three-phase current; calculating the cross product of the adjustable current vector and the reference current vector; obtaining the absolute value of the cross product; calculating a phase and a magnitude of the periodic error for compensation; obtaining a position signal theta output from the resolver; subtracting the periodic error to be compensated- from the position signal theta to obtain the compensated rotorposition. The invention can effectively compensate the periodic error of the resolver on-line, thereby solving the problem of phase current distortion and torque ripple 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 for periodic errors in the output signal 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 will ca...
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IPC IPC(8): H02P21/14H02P21/18H02P21/22
CPCH02P21/14H02P21/18H02P21/22
Inventor 陈东东李健陈俊桦曲荣海
Owner HUAZHONG UNIV OF SCI & TECH