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Method for acquiring compensating voltage restraining commutation torque pulsation device of brushless direct-current motor

A brushed DC motor and voltage compensation technology, applied in torque ripple control and other directions, can solve the problems of large acquisition, delayed commutation time, and high cost, and achieve the effect of small acquisition, reducing switching loss and switching interference.

Inactive Publication Date: 2017-05-10
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The direct torque method uses torque as the control quantity; the intelligent algorithm has high acquisition accuracy, but the acquisition volume is large; the switch modulation method uses various modulation methods to reduce torque ripple, but many modulation strategies will delay the commutation time; switch The converter method is to install a switching converter between the power supply and the inverter, and increase the bus voltage during commutation. The commutation performance is good, but the cost is high

Method used

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  • Method for acquiring compensating voltage restraining commutation torque pulsation device of brushless direct-current motor
  • Method for acquiring compensating voltage restraining commutation torque pulsation device of brushless direct-current motor
  • Method for acquiring compensating voltage restraining commutation torque pulsation device of brushless direct-current motor

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Embodiment

[0037] The brushless DC motor runs in the two-two conduction mode, taking AC commutation to BC as an example, during the non-commutation period, according to the formula Charge the boost capacitor. During the commutation period, the boost capacitor and the power supply are connected in series to supply power to the motor. The capacitor voltage drops. When the commutation ends, the bus voltage U bus =4E, where U bus =U dc + U c , U bus is the bus voltage, U dc is the supply voltage, U c is the capacitor voltage, E is the back electromotive force, and I is the phase current.

[0038] The present invention adopts the parameter of brushless DC motor:

[0039]

[0040] According to the formula Ideal compensation voltage U c is 91V.

[0041] Figure 4 , the bus voltage U during commutation bus =345V, at this time the boost capacitor compensation voltage U c =U bus -U dc =345-300=45V, which is less than the ideal compensation voltage of 91V. At this time, the mini...

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Abstract

The invention belongs to the field of brushless direct-current motor control, and particularly relates to a method for acquiring compensating voltage restraining a commutation torque pulsation device of a brushless direct-current motor. In a non-commutation period, a first switch T1 is switched off, a second switch T2 is switched up, a power supply charges a boosting capacitor to enable the compensating voltage Uc=Ubus-Udc, and when charging is over, the second switch T2 is switched off, when commutation starts, the first switch T1 is switched on, a diode is switched off, the power supply and the capacitor are connected serially so as to supply power to the brushless direct-current motor until commutation is over, and when voltage of the capacitor drops and commutation is cover, bus voltage is equal to four times of a counter electromotive force amplitude, namely Ubus=4E. In a commutation period, a phase power device can be switched on without modulating the bus voltage by chopping, so that generation of direct-current bus voltage fluctuation caused by reverse bus current is avoided, switch loss and switch interference are reduced. The method for acquiring the compensating voltage restraining the commutation torque pulsation device of the brushless direct-current motor is low in data acquisition amount and has a certain engineering application value.

Description

technical field [0001] The invention belongs to the field of brushless direct current motor control, and in particular relates to a compensation voltage acquisition method for a device for suppressing commutation torque ripple of a brushless direct current motor. Background technique [0002] Brushless DC motors are widely used in various industrial fields due to their reliable operation, fast dynamic response, high efficiency, low noise, and wide operating speed, such as automotive electronics, medical equipment, industrial automation equipment, and instrumentation. However, due to the structural characteristics of the motor and the unique commutation control strategy, torque ripple occurs during commutation, which affects the application of brushless DC motors in high-performance fields. [0003] The motor winding is an inductive device, and the current rise and fall cannot be completed instantaneously during commutation, resulting in inconsistent time for the rising curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/10
CPCH02P6/10
Inventor 姚绪梁赵继成江晓明杨光仪王峰林浩张永奇张燕常英健孙小琴
Owner HARBIN ENG UNIV
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