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Brushless motor driver sinusoidal drive technology


主营无刷电机包括 : 高速直流无刷电机 , 低速直流无刷电机 , 行星减速无刷电机 , 齿轮减速无刷电机及相关配套 无刷电机驱动器 ,可按要求定制服务。 Dongguan Bangtuo's main brushless motors include : high-speed DC brushless motors , low-speed DC brushless motors , planetary reduction brushless motors , gear reduction brushless motors and related brushless motor drivers, which can be customized according to requirements.

本体实物的使用,更加值得关注的是与直流无刷电机相关的技术的应用,例如直流无刷电机的正弦驱动技术。 The increasing popularity of DC brushless motors is not just the actual use of the actual DC brushless motor body. What is more noteworthy is the application of technologies related to DC brushless motors, such as those of DC brushless motors. Sine drive technology. So, what is the sinusoidal drive technology of brushless DC motor? What does it do? We do not want to deepen the knowledge in this regard.

的正弦驱动技术即通过对无刷电机绕组施加一定的电压,使无刷电机绕组中产生正弦电流,通过控制正弦电流的幅值及相位达到控制电机转矩的目的。 The sinusoidal drive technology of a DC brushless motor is to apply a certain voltage to the brushless motor windings to generate a sinusoidal current in the brushless motor windings, and control the torque of the motor by controlling the amplitude and phase of the sinusoidal current. Compared with the traditional square wave control, the phase current of the DC brushless motor is sinusoidal and continuously changes, and there is no sudden change in the commutation current, so the motor has low noise.

的正弦驱动技术可分为:简易正弦波控制与复杂正弦波控制。 According to the complexity of the control, the sine drive technology of the DC brushless motor can be divided into: simple sine wave control and complex sine wave control.

Simple sine wave control is to control the motor current by controlling the amplitude and phase of the sine phase voltage of the motor. Usually a certain form of voltage is applied to the motor end wire to make a sinusoidal phase voltage across the winding. PWM 以及空间矢量 PWM Common generation methods are: sinusoidal PWM and space vector PWM . PWM 原理简单且便于实现,因此简易正弦波控制中通常采用其作为 PWM 生成方式。 Because the principle of sine PWM is simple and easy to implement, it is usually used as a PWM generation method in simple sine wave control . 1 BLDC 控制结构图,其中 Ux Uy Uz 为桥臂电压, Ua Ub Uc 为电机绕组的相电压,以下对于不同种类的 PWM 调制方式的介绍将基于此结构图进行。 Figure 1 is a BLDC control structure diagram, where Ux , Uy , Uz are bridge arm voltages, Ua , Ub , Uc are phase voltages of the motor windings. The following description of different types of PWM modulation methods will be based on this structure diagram.

Figure 1: Block diagram of DC brushless motor control

1 )三相正弦调制 PWM ( 1 ) Three-phase sinusoidal modulation PWM

SPWM 为最常见的正弦 PWM 生成方式,即对电机三个端线施加相位相差 120 度的正弦电压信号,由于中性点为 0 ,因此电机相电压也为正弦,且相位与施加的正弦电压相同。 Three-phase SPWM is the most common sinusoidal PWM generation method, that is, applying a sinusoidal voltage signal with a phase difference of 120 degrees to the three end wires of the motor . Since the neutral point is 0 , the motor phase voltage is also sinusoidal, and the phase is the same as the applied sinusoidal voltage. the same. 2 所示。 As shown in Figure 2 .

2 )开关损耗最小正弦 PWM ( 2 ) Minimum sinusoidal PWM of switching loss

SPWM 不同,采用开关损耗最小正弦 PWM 时,施加在电机端线上电压 Ua Ub Uc 并非正弦波电压,此时电机中心点电压并非为 0 ,但是电机相电压仍然为正弦。 Unlike common SPWM , when using the minimum switching loss sinusoidal PWM , the voltage Ua , Ub , Uc applied to the motor end line is not a sine wave voltage. At this time, the motor center point voltage is not 0 , but the motor phase voltage is still sinusoidal. Therefore, this type of control method is line voltage control. See Figure Three:

Figure three:   SPWM 端线电压 Three-phase modulated SPWM terminal line voltage

正弦波驱动技术的相关资迅,可关注东莞市邦拓运控智能科技有限公司官方网址 http://124bpms.com For more information about the sine wave drive technology of DC brushless motors , you can follow the official website of Dongguan Bangtuo Transportation Control Intelligent Technology Co., Ltd. http://124bpms.com

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