The rotor speed of a permanent magnet motor is O Inversely proportional to the field current O Proportional to the flux density a linear function of the armature voltage O Proportional to the armature current Question 4 For which applications below are DC series motors more suitable? O Cordless drill O Cordless saw Portable fan Electric scooter Electric water pumps

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.