Week 3 Session 7

EV Fundamentals

WEEk 3 S7

Q1:- Compare the different motors used in EV and list down the advantages and disadvantages of each.

The are different types of motors, but the motors which are widely used in Electrical vehicles (EV's)

are as follows.

• Brushed perminent magnet DC motor.

A brushed DC motor has permanent magnets inside its outer body with a rotating armature inside.

The permanent magnets are stationary and are called the 'stator'. The rotating armature contains

an electromagnet and is called the 'rotor'.

• Brushless DC motor.

It is the type of motor which is electrically commutated where the unideractional torque is achieved

by integrated inverter/switching circuit.

• Perminent magnet synchronous motor.

It is similer to a brushless direct current motor, it has perminent magnets attached to rotor, it is the

best choice for high performance applications.

• Three phase induction motor.

A 3-phase induction motor is an electromechanical energy conversion device which converts 3-phase

input electrical power into output mechanical power. A 3-phase induction motor consists of a stator

and a rotor.

• Switched reluctance motor.

It is the type of motor where the stator and the rotor poles are aligned then it quickly switches to

the next phase so that the rotor keeps chasing the phase that is excited

TYPE OF MOTOR	ADVANTAGES	DISADVANTAGES
Brushed perminent magnet DC motor.	Simple configuration It can be operated without any power electronic drive circuit. Low cost of construction	Wear and tear due to contact brushes. Electrically noisy Less effecient
Brushless DC motor	Compact in size High torque. Best speed regulation.	Requires switching controllers. Comples circuit design. High cost
Perminent magnet synchronous motor.	High efficiency. High power and torque density. Low maintanence.	Unstable operation , when prime mover speed changes. High initial cost. not self starting.
Three phase induction motor	Low maintanance. strong and efficient. Self starting High efficiency and good PF	No overload handling capacity. power connection requires high insulation costs.
Switched reluctance motor	The motor still runs if there is any damage to any pole. better efficiency better reliability, high fault tolerance	High noise Vibration and torque ripple.