What type of motor changes speed by changing the number of stator poles

Q: Why are circulating currents detrimental to good motor operation?

A: When motor are operated on DC drives , there are two types of motor operation we can choose which…

Q: A 220 V series motor takes 15 A and runs at 700 rpm. The armature resistance including the…

A: The solution is given below

Q: When a d-c motor is tested by the electrical input method, the field rheostat is adjusted to give A.…

A: Above question is based on DC motor, the major classification of DC motor are Series motor Shunt…

Q: What should be the number of revolutions of a dc machine to be able to have a generated emf of 200V?…

A: We need to find out the speed for given motor.

Q: DC motor's magnetic field gets stronger with an increase in mechanical load?

A: DC Machine  A DC machine is nothing but a synchronous machine plus a commutator. DC…

Q: For a given DC motor, the speed depends upon flux only applied voltage alone back emf back emf and…

A:

Q: p.m. with a 40 36

A:

Q: What is the reason why a synchronous motor can be found running at no load?

A: we need to explain synchronous motor.

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.