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A compensation method for pwm wave dead zone of eps brushless motor

A technology for dead zone compensation and brushless motors, which is applied in the control of generators, motor generators, and electronically commutated motors. It can solve problems such as inaccurate compensation methods, high-cost current sensors, and large calculation burdens. Achieve the effects of easy implementation, high compensation accuracy, and improved dynamic and static performance of motor control

Active Publication Date: 2022-04-08
ZHUZHOU ELITE ELECTRO MECHANICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the dead zone compensation methods in the prior art are for compensation applications in specific occasions, or the compensation methods are not accurate enough, or the compensation methods are too cumbersome, require a large amount of calculation burden, or require an additional high-cost current sensor

Method used

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  • A compensation method for pwm wave dead zone of eps brushless motor
  • A compensation method for pwm wave dead zone of eps brushless motor
  • A compensation method for pwm wave dead zone of eps brushless motor

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Embodiment 1

[0033] This embodiment provides a method for compensating the dead zone of the PWM wave of the EPS brushless motor.

[0034] In the specific implementation process, an EPS brushless motor PWM wave dead zone compensation device is used to implement the compensation method. Such as image 3 , Figure 4 As shown, the EPS brushless motor PWM wave dead zone compensation device includes a dead zone logic operation module and a sequentially connected SVPWM module, a three-phase inverter PWM wave output module with a dead zone function, a pre-drive module, and a three-phase inverter module. The dead zone logic operation module is connected to the PWM module, the input terminal of the SVPWM module inputs the target voltage, and the three-phase inverter module is connected to the brushless motor; it also includes a voltage comparison module for judging the phase current polarity of the brushless motor, and a dead zone compensation operation module; the input terminal of the voltage co...

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PUM

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Abstract

The invention relates to the technical field of motor control, and discloses a PWM wave dead zone compensation method for an EPS brushless motor. The PWM wave duty ratio of the target voltage is calculated through the SVPWM control algorithm, and the dead zone time is inserted according to the PWM wave duty ratio, and the PWM wave is output Drive the motor for the switching tube of the motor drive module; calculate the voltage transient loss value through the dead time and the switching tube opening time and closing time, and use the voltage transient loss value as a voltage compensation value to compensate to the target voltage. The dead zone compensation method of the present invention can improve the output current waveform of the motor, effectively suppress the distortion of the current waveform, and improve the dynamic and static performance of the motor control, and the compensation method is easy to implement, the process is simplified, and the compensation precision is high.

Description

technical field [0001] The present invention relates to the technical field of electric power steering, and more specifically, to a method for compensating a PWM wave dead zone of an EPS brushless motor. Background technique [0002] Compared with other motor controls, the EPS brushless motor has higher requirements on the dynamic and static performance of the motor control. The commonly used control technology is Space Vector Pulse Width Modulation (SVPWM), which has the advantages of easy digital control and good output circuit waveform. However, in the three-phase inverter using SVPWM, in order to ensure that the upper and lower power switches of the same bridge arm will not have a shoot-through fault, it is necessary to add a dead time, such as figure 1 shown. And the addition of dead time leads to dead time effect, such as figure 2 As shown, iAbcFbck.A, iAbcFbck.B, and iAbcFbck.C are respectively the three-phase current waveforms of the motor after adding the dead t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02M1/38H02M7/5395
CPCH02M1/38H02M7/5395H02P21/14H02M1/385
Inventor 周文峰曾科童向辉高明赵斌
Owner ZHUZHOU ELITE ELECTRO MECHANICAL