What is the starting torque of a capacitor start motor?

Why capacitor start motor have high starting torque?

Characteristics of Capacitor Start Motor

Speed is constant within 5% slip. Capacitor start motor develops high starting torque about 4 to 5 times the full load torque and reduces the starting current. The direction of rotation can be changed by interchanging the connection of supply to the either of the winding.

What causes low starting torque in a capacitor motor?

When a capacitor short-circuits, the winding in the motor may burn out. When a capacitor deteriorates or opens, the motor has poor starting torque. … More motors use electrolytic capacitors than oil capacitors.

Which motor gives higher starting torque?

The capacitor start motor develops a much higher starting torque of about 3 to 4.5 times of the full load torque.

What does low starting torque mean?

Locked Rotor or Starting Torque

The Locked Rotor Torque or Starting Torque is the torque an electrical motor develops when starting at zero speed. … A lower Starting Torque can be accepted for centrifugal fans or pumps where the start load is low or close to zero.

What should be the maximum starting torque under the maximum starting torque condition?

It can be proved that starting torque will be maximum when rotor resistance/phase is equal to standstill rotor reactance/phase. Under the condition of maximum starting torque, Φ2 = 45° and rotor power factor is 0.707 lagging [See Fig.

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