106 CONTROL OF MACHINES

106 CONTROL OF MACHINES

106 CONTROL OF MACHINES

106 control of machines

106 control of machines

106 CONTROL OF MACHINES motor torque at the instant the dc is applied , rise to a value of 500 to 600 percent at about 3 to 6 percent speed , and then drop rapidly to zero as the motor comes to rest . Fig . 3.42 Dynamic braking of a three phase induction motor (a) Power circuit diagram (b) Control circuit diagram The reason for above mentioned variation in the braking torque is explained as follows:

It is known that braking torque is developed due to interaction between the rotor current and the total flux . The total flux t in an ac motor during braking has resultant value that is represented by the constant dc flux and a superimposed flux caused by the rotor emf . It ,

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