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Driving method for noise suppression of brushless direct current motor

A brush DC motor and noise suppression technology, which is applied in the driving field of brushless DC motor noise suppression, and can solve problems such as fluctuations and fluctuating electromagnetic torques

Pending Publication Date: 2021-10-29
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

like figure 2 as shown, figure 2 It is a schematic diagram of the three-phase current charging and discharging process during commutation, because the current freewheeling phase is too fast compared to the current charging, resulting in fluctuations in the third-phase phase current during this process, resulting in fluctuations in the output electromagnetic torque

Method used

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  • Driving method for noise suppression of brushless direct current motor
  • Driving method for noise suppression of brushless direct current motor
  • Driving method for noise suppression of brushless direct current motor

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Embodiment Construction

[0039] The specific implementation manner of the present invention will be described in more detail below with reference to schematic diagrams. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

[0040] The inventors found that the output speed needs to follow the target speed during closed-loop speed regulation of the motor, and the duty ratio is used as the adjustment value of the speed regulator output. With different loads, different duty ratios will be output in order to maintain different target speeds. A simple way to compensate is to increase or decrease the duty cycle during commutation to meet the boundary conditions, and the target duty cycle is calculated. After the commutation time of one ca...

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Abstract

The invention provides a brushless direct current motor noise suppression driving method, and the method comprises the following steps: establishing a model, and obtaining the turn-off time of a delayed turn-off phase during commutation and the turn-on time of a delayed turn-on phase during commutation; judging whether the motor is in high-speed operation or low-speed operation; during high-speed operation, delaying the turn-off time of the turn-off phase during commutation; and during low-speed operation, delaying the on-time of the on-phase during commutation. According to the driving method for noise suppression of the brushless direct current motor, the turn-off time of the turn-off phase or the turn-on time of the turn-on direction during phase commutation is delayed by judging whether the motor is in high-speed operation or low-speed operation, the torque ripple during phase commutation is reduced, and finally the noise of the motor is reduced.

Description

technical field [0001] The invention relates to the field of automobile motors, in particular to a driving method for noise suppression of a brushless DC motor. Background technique [0002] During the operation of the brushless DC motor, its motor noise is one of the main sources of motor operating noise. Motor noise is caused by the vibration of the stator, rotor and the entire motor structure caused by the magnetic field pulsation in the gap of the motor. Under the background of square wave modulation, the noise of the motor is particularly serious. The specific analysis is as follows: refer to figure 1 , figure 1 It is the topology structure of brushless DC motor star connection, in the figure: R s Indicates the stator resistance, L s Indicates the stator inductance, e x (x=a / b / c) represents the counter electromotive force of a certain phase. [0003] For the control method using 120-degree square wave rectification, the output electromagnetic torque can be express...

Claims

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Application Information

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IPC IPC(8): H02P6/08H02P6/10H02P6/15
CPCH02P6/08H02P6/10H02P6/15
Inventor 张毅鸣付子鑫程燃
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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