What is the method of changing the speed of miniature DC motor?

Miniature DC motors are widely used in various electronic and electric products to achieve vibration and expansion by continuous rotation. In the process of driving DC motor, many products need to adjust the speed change to improve the use effect, the following is a brief description of the speed change method of miniature DC motor.

1. Voltage adjustment of DC motor armature

The main method is to modify the speed of a small DC motor from the rated speed and to reduce the armature voltage from the rated current downward. This method of constant torque speed control is simple, affordable and fast response.

2. Changing the primary flux of the DC motor

The constant power speed control method, with a relatively large time constant of armature current change and slow response time, can be achieved by changing the flux of the DC motor to achieve stepless smooth speed control. However, this method can only attenuate the flux from the rated speed of the miniature DC motor upward.

3. Adjusting the armature circuit resistance

This type of speed regulation is relatively rare, because of the disadvantages of changing the resistance, such as poor smoothness of speed regulation, soft mechanical characteristics, and only stepped speed regulation, etc. It is only used in applications with very low speed regulation requirements.

The above is the method of changing the speed of miniature DC motor, for more information, please feel free to consult us!