Common speed regulation methods of DC motor: one is to adjust the armature voltage, the other is to adjust the excitation current. The magnetic field of the miniature DC motor we have seen is fixed, and the non-adjustable permanent magnet has to adjust the armature voltage. What are the methods of adjusting the armature voltage?
Usually we use thyristor voltage regulation method and pulse width modulation method (PWM). The H-type of PWM belongs to voltage regulation and speed regulation. PWM H-bridge can only realize high-power speed regulation. The domestic super power speed regulation also relies on the controllable rectification of silicon controlled rectifier to realize the voltage regulation and speed regulation of DC motor. There is also speed regulation by weakening the excitation magnetic field.
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