Week 3 Session 7

DC series motor :

High starting torque capability of the DC series motor makes it a suitable option for traction applications.

It is widely used in traction applications.

Advantages:

* This motor is easy speed control.

*It can withstand a sudden increase in load.

Disadvantages:

*DC series motor is high maitenanace due to brushes and commutators.

BLDC motors:

It is similar to DC series motor with permanent magnets.

It does not have the brush and commutator arrangement and the commutation done by electronically.

Advantages:

*Less maintenance because there is no brushes and commutators.

Disadvantages:

*The cost is high compare to DC series motor.

*At low speed there is slightly vibrations occurs in the motor.

PMSM motor:

The motor have traction characteristics like high power density and high efficiency.

This motor is used in automotive applications.

Advantages:

High efficiency and performance is also good.

Disadvantages:

Cost is high and maintenance also high.

Induction motor:

The motor do not a high starting torque like DC series motor under fixed voltage and fixed frequency operation.

This can be altered by V/F methods.

It is more robust and mechanically stronger than other motors.

Advantages:

*It is low maintenance and high efficiency.

*It does not requires starters.

*cost is low.

Disadavntages:

*Starting torque is low.

*poor positioning control.