Why does speed regulation not apply to Series motors?

Which of the speed control does not apply to the series motor?

Explanation: Field control method is not suited to applications needing speed reversal; since the only way to reverse speed is to disconnect the motor from the source and reverse the field/armature polarity.

What is the main disadvantage of a series motor?

The series motor has poor speed regulation. When the load speed of the machine increases, the DC shunt motor keeps its constant speed from no load to full load. The dc series motor’s Torque drops sharply when the speed increases.

What is the speed regulation of a DC series motor?

Definition: The speed regulation of a DC Motor is defined as the change in speed from no load to full load. It is expressed as a fraction or a percentage of the full load speed.

What will happen to the speed of a series motor if the temperature of armature resistance is increased?

In a series motor, when the resistance increases due to rise in temperature, the IR drop increases, which reduces the effective voltage applied to the armature, hence speed decreases.

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Why Series motor produces high torque and speed initially without load?

Explanation: At no load, armature current tends to zero, flux φ tends to zero, where speed is inversely proportional to the flux, speed will tend to infinity. Thus, no load speed of DC series motor is highest. … Explanation: A conveyor requires high torque with steady speed, which provided by DC series motor.

Where is series motor normally used?

Series motors are used on loads that require very high starting torques or severe accelerating duty or where the high-speed characteristics may be advantageous, such as in hoists.

What is the advantage of a compound motor over a series motor?

It takes the benefits of both the motors and combines them. Compound DC motor provides high starting torque and also provides good speed regulation. However, it is a compromise between both types of motors, which means it has good starting torque as compared to series DC motor but slightly lesser than shunt DC motor.

Why does a DC series motor have a very high speed regulation?


The reduction in the field current reduces the counter emf and the motor speeds up trying to rebuild the counter emf resulting from the reduced field flux. As a result, there is a greater increase in speed than would occur in a shunt motor for the same load change.

Why series motor is never started on no load?

A series motor should never be started at no load. With no mechanical load on the series motor, the current is low, the counter-EMF produced by the field winding is weak, and so the armature must turn faster to produce sufficient counter-EMF to balance the supply voltage. The motor can be damaged by overspeed.

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Why is speed regulation important in electric motor?

Speed control in the machine shows an impact on the speed of rotation of the motor where this direct influence on the machine functionality and is so important for the performance and outcome of the performance.