Speed of a permanent magnet DC motor:(a) It is directly proportional to the armature voltage at a given load torque(b) The speed torque characteristics are more flat than in a wound field motor(c) It depends upon armature voltage and are more flat than in a wound field motor(d) None of the mentionedThe question was asked in a job interview.Question is from Controller Components in division Control System and Components of Control Systems

Speed of a permanent magnet DC motor:(a) It is directly proportional t

1.	Speed of a permanent magnet DC motor:(a) It is directly proportional to the armature voltage at a given load torque(b) The speed torque characteristics are more flat than in a wound field motor(c) It depends upon armature voltage and are more flat than in a wound field motor(d) None of the mentionedThe question was asked in a job interview.Question is from Controller Components in division Control System and Components of Control Systems
Answer» The CORRECT answer is (c) It depends upon armature voltage and are more flat than in a wound field motor The explanation: Speed of a PERMANENT magnet DC motor is directly proportional to the armature voltage at a GIVEN load torque and speed torque characteristics are more flat than in a wound field motor as the effect of armature reaction is LESS pronounced in a PM motor.

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