An on-line compensation method for periodic error in the output signal of a resolver
A periodic error and resolver technology, which is applied in the control of electromechanical brakes, motor generator control, control of electromechanical transmissions, etc., can solve problems such as torque ripple, resolver output signal phase current distortion, etc., to achieve less calculation, High compensation accuracy, the effect of solving phase current distortion and torque ripple
Inactive Publication Date: 2019-01-18
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 object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, 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 constitute a conflict with each other.
[0026] Before introducing the technical solution of the present invention, firstly, a brief introduction is made to the existing permanent magnet motor control system. like 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 se...
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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 signal correction of a position sensor of a permanent magnet motor, and more particularly relates to an online compensation method for periodic errors in output signals of a rotary transformer. Background technique [0002] In industrial applications such as electric vehicles, the demand for permanent magnet motors (Permanent Magnet Synchronous Motor, PMSM) is growing rapidly. The field-oriented control (FOC) technology of permanent magnet motors has excellent performance, so it has been widely used. Field orientation technology requires precise rotor position, which puts higher demands on the position sensor. As a common position sensor, a resolver 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 nonlinear characteristics of the resolver itself, the position signal it provides to the motor contains vario...
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Login to View More 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