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首页> 外文期刊>Physical Science International Journal >A Proposed Modified Constant Frequency Variable Duty PWM Based Speed Control Technique for DC Motor Drives: A New Method to Achieve More Precise Control over Speed
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A Proposed Modified Constant Frequency Variable Duty PWM Based Speed Control Technique for DC Motor Drives: A New Method to Achieve More Precise Control over Speed

机译：一种提出的基于恒定频率可变占空比PWM的改进的直流电动机驱动器速度控制技术：一种实现更精确的速度控制的新方法

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摘要

In this paper, the authors have proposed a new method for speed control of DC motor drives via modified constant frequency-variable duty (CFVD) pulse width modulation (PWM) technique. The armature of the DC motor rotating in very low speed has to accept abrupt mechanical shocks (kicks) due to the application of large amplitude narrow pulse trains (very low duty cycle) while the speed of the DC motor is controlled by using the conventional CFVD PWM method. These consecutive abrupt mechanical shocks lead to reduction in life of the DC motor. In the proposed method, an extra control signal (having modified sinusoidal form) is subtracted from the conventional fixed amplitude CFVD PWM signal to obtain the modified speed control signal, which provides gradual periodic increase and decrease in the amplitude of consecutive pulses for all duty cycles. Thus for very low duty cycles (for achieving very low speed) the abrupt mechanical shocks on the armature can be avoided. Moreover, the peak amplitude of the subtracted extra control signal provides an additional control over the speed of DC motor along with the duty cycle of the conventional PWM signal. A circuit for generating the modified control signal has been designed and also fabricated for testing. Finally the experiments are carried out to study the speed control characteristics of a 9 V DC motor drive. The proposed method is found to be better than the conventional CFVD PWM speed control method as regards flexibility in speed control, transient response and abrupt electrical breaking.
机译：在本文中，作者提出了一种通过改进的恒频可变占空比（CFVD）脉宽调制（PWM）技术对直流电动机驱动器进行速度控制的新方法。直流电动机的电枢以非常低的速度旋转时，由于应用了大幅度的窄脉冲序列（非常低的占空比），因此必须承受突然的机械冲击（撞击），而直流电动机的速度是通过使用常规CFVD来控制的PWM方法。这些连续的突然机械冲击会导致直流电动机的寿命缩短。在提出的方法中，从常规的固定振幅CFVD PWM信号中减去额外的控制信号（具有修正的正弦形式）以获得修正的速度控制信号，该信号在所有占空比下提供连续脉冲幅度的逐渐周期性增加和减少。因此，对于非常低的占空比（为了实现非常低的速度），可以避免电枢受到突然的机械冲击。此外，相减的额外控制信号的峰值幅度提供了对直流电动机速度以及常规PWM信号占空比的额外控制。已经设计并制造了用于生成修改后的控制信号的电路以进行测试。最后，进行了实验以研究9 V DC电动机驱动器的速度控制特性。在速度控制的灵活性，瞬态响应和突然的电气中断方面，发现该方法优于传统的CFVD PWM速度控制方法。

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