Question

A universal motor is preferred for which application?
1. High speed and high torque
2. Low speed
3. Low torque and high speed
4. Low torque

Answer 1

Correct Answer - Option 1 : High speed and high torque

Universal motor:

• Universal motor is a commutated series-wound motor
• It can operate on either AC or DC power and uses an electromagnet as its stator to create its magnetic field
• These motors are generally series wound (armature and field winding are in series), and hence produce high starting torque
• So, universal motors are generally built into the device they are meant to drive as they have variable speed characteristics.
• Most of the universal motors are designed to operate at higher speeds, exceeding 3500 rpm

 

Important Points:

Hysteresis motor: Low power factor, low starting torque

Capacitor start motor: High starting torque, low power factor

Capacitor run motor: Low starting torque, high power factor

Universal motor: High speed, high starting torque, operate on either AC or DC power