universal motor
universal motor
Ans . This motor is designed to work on both A.C. and DC. Supply.
In the universal motor, stator winding is in series with rotor winding. The stator is built up of laminations instead of a solid piece as in DC. series motor. When working on A.C. the armature and field current have the same direction with respect to each other. Hence, the motor works like ordinary series motor. The speed is above the synchronous speed and below the dangerous value whereas working on A.C. the load speed characteristic is similar to that of a d.c. series motor.
The motor is widely used in hair-driers, portable drills, blowers, sewing machines and kitchen appliances, etc. The direction of rotation of this can be changed by interchanging connections to the field with respect to armature as in d. c. series motor. But speed should not be reversed, as it will give heavy sparking.
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