What motor has the highest starting torque?

DC Series motor has highest starting torque. 3-phase Induction motors have highest staring current, 5 to 7 times full-load current and develop about 2 times the full-load torque. Plain Synchronous motors do not have any starting torque.

Which is the highest starting torque motor?

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

Which of the following has a high starting torque?

The capacitor-start motor has a high starting torque. true. 25.

Which motor has a poor starting torque?

Shaded-pole motor has the lowest starting torque whereas universal motor, capacitor start capacitor-run motor and repulsion induction motor have high starting torque.

Why does a dc series motor has a high starting torque?

In case of series motor the flux produced is directly proportional to the armature current. Hence torque is directly proportional to the square of armature current. So as current during starting is 1.5 times the rated so starting torque is higher for series motor.

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Which motor has high starting torque AC or DC?

Series motors exhibit higher starting torque but have a steeper drop-off in speed as the load increases. Parallel or shunt DC motors provide lower starting torque but have a flatter speed vs. load relationship and can, therefore, provide a constant speed almost independent of the load applied.

Which motor has high starting torque slip ring or squirrel cage?

Slip ring induction motors are mainly used in applications where high starting torque is required such as cranes, hoists, conveyors, etc. while the squirrel cage induction motors are used in general application like lath machine, drill machine, pumps and fans, etc.

Why is the starting torque relatively small in single phase induction motors?

Ans: The starting winding has a relatively small number of turns of fine wire and its resistance is higher than that of the main winding. … (i) The angle between Is and Im is small (approximately 25 degree) in a resistance split-phase induction motor, so the starting torque is small.

What is the difference between AC series motor and DC series motor?

AC motor works on the concept of alternating current, whereas DC Motor works on the direct current. … DC motors are self-starting motors. The armature is stationary, and the magnetic field rotates in the AC motor but in DC motor the armature rotates, and the magnetic field is stationary.

Which of the following motor will relative higher power factor?

The power factor, torque pulsation, and efficiency are also improved because the motor runs as a two-phase motor. The motor will run more quickly. Capacitor Run Motor has relatively higher power factor.

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What is the starting torque of a DC motor?

Starting torque is the torque transferred by the shaft coupling during run-up (see Start-up process). It is calculated based on the ratio of power (P) to angular velocity (ω) and is represented as a rotational speed function.

What is meant by high starting torque?

In a layman’s language high starting torque is referred as the high amount of power any engine can generate initially. For example if you want to climb a hill you will require high starting torque rather than high speed.

How do you increase the starting torque of a DC motor?

Any DC motor will experience a decrease in speed when a load is applied, which causes the back EMF to decrease. The reduction in back EMF increases the net voltage, since the supply voltage remains constant. The net voltage increase causes the armature current to increase, which increases the motor torque.