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How to reverse a DC motor

Release time: 2022-07-22

How much do you know about the operation requirements and operation methods of DC motors? When this equipment is used, it sometimes needs to be reversed, so how does this equipment achieve reverse rotation? Usually, the following two methods can be used to Reverse the motor.

(1) Reverse the voltage across the armature to change the direction of the armature current.

(2) Change the polarity of the excitation winding, that is, change the direction of the main magnetic field.

In actual operation, due to the large number of turns of the excitation winding of the DC motor and the large inductance, disconnecting the excitation winding from the power supply will generate a large self-inductive electromotive force, which will cause the switch to generate a large spark, and may also breakdown Insulation of field windings. Therefore, for a DC motor requiring frequent reversal, the method of changing the direction of the armature current should be used to achieve reversal.

In addition, it is also pointed out that only one of the above methods can be used to realize the reversal of the DC motor. If these two methods are used at the same time, the reverse will be positive, but the purpose of the motor reversal cannot be achieved. I hope you will use it in future operations. Pay more attention to this aspect and try to avoid mistakes in operation.

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