PWM wave dead zone compensation device of EPS brushless motor
A dead-time compensation, brushless motor technology, applied in output power conversion devices, electrical components and other directions, can solve the problems of additional high-cost current sensors, inaccurate compensation methods, and cumbersome compensation methods, and achieves improved dynamic and static performance. Suppress current waveform distortion and improve the effect of current waveform
Pending Publication Date: 2018-04-10
ZHUZHOU ELITE ELECTRO MECHANICAL
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[0003] Most of the dead zone compensation methods in the prior art are for compensation applications in specific occasions, or the compensation method is not accurate enough, or the compensation method is too cumbersome, requires a large amount of calculation burden, or requires an additional high-cost current sensor
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Embodiment 1
[0031] This embodiment provides an EPS brushless motor PWM wave dead zone compensation device.
[0032] Such as image 3 , Figure 4 As shown, an EPS brushless motor PWM wave dead zone compensation device is provided, including 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, a three-phase The 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, Dead zone compensation calculation module; the input terminal of the voltage comparison module is connected to the three-phase inverter module, and the current polarity is judged by collecting and comparing the three-phase voltage of the br...
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The invention relates to the technical field of motor control, and discloses a PWM wave dead zone compensation device of an EPS brushless motor. The device comprises a dead zone logic operation module, an SVPWM module, a three-phase inverter PWM wave output module, a pre-drive module and a three-phase inverter module, wherein the SVPWM module, the three-phase inverter PWM wave output module, the pre-drive module and the three-phase inverter module are sequentially connected. The three-phase inverter PWM wave output module has the dead zone function. The dead zone logic operation module is connected with a PWM module. The input end of the SVPWM module is used for inputting a target voltage. The three-phase inverter module is externally connected with a brushless motor. The device further comprises a voltage comparison module used for judging the current polarity of the brushless motor, and a dead zone comparison operation module. The input end of the voltage comparison module is connected with the three-phase inverter module, and the output end of the voltage comparison module is connected with the dead zone compensation operation module. A voltage compensation value is calculated through the dead zone compensation operation module. The output end of the dead zone compensation operation module is connected with the input end of the SVPWM module. The voltage compensation value issuperposed to the target voltage. According to the device, the compensation precision is high, and the distortion of the current waveform is effectively inhibited. The dynamic and static performancesof the motor are improved.
Description
technical field [0001] The present invention relates to the technical field of electric power steering, and more particularly, relates to a PWM wave dead zone compensator for 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 time...
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IPC IPC(8): H02M1/38
CPCH02M1/38H02M1/385
Inventor 周文峰向辉曾科童高明赵斌
Owner ZHUZHOU ELITE ELECTRO MECHANICAL