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Why so much current flows through the circuit of DC motors

Why so much current flows through the circuit of DC motors

Place of Origin : China

Brand Name : feelikee

Supply Ability : 1000

MOQ : 1

website : www.feelikee.com

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Everywhere DC motors are used in large applications, the use of drives are very necessary for the smooth running and operating of these motors. The DC motor drives are used mainly for good speed regulation, braking and reversing.

We know that, normally the rotor of a DC motor is energized by the commutation process through brushes. So the maximum allowable starting current is determined by the current which can be safely carried out by the brushes without sparking. In general, the motors are such designed that they can carry almost of the rated current during starting condition. But why so much current flows through the circuit of DC motors during the starting condition?

This is because when the motor is at stand still condition, there is only a small armature resistance present in the circuit so no back emf is generated. That is why when the motor is started with full supply voltage across its terminal, there is a huge current flow through the motor, which may damage the motor because of heavy sparking across the commutators and a huge amount of heat is generated. That is the reason why some precautionary measures are taken during the starting of the DC motors.


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DC motors

      

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