Motor Drive technologies:
IC engine cannot operate in wide torque and speed range. Therefore it requires support of clutch and multiple transmission gear.
When clutch is engaged IC engine is coupled to gearbox, energy transmit from IC engine to gearbox
IC based engine requires
- Clutch
- Multiple or variable gears
- Differential
Battery electric vehicle
- Clutch is absent
- Normally fixed gears are used
- Differential absent
Requirement of an EV motor compared to industrial motors:
- Maximum torque than rated torque for starting,Hill climbing & overtaking etc.
- EV motors demand high power density & good efficiency
- EV motors desire high controllability , high steady state accuracy and good dynamic performance
- EV motors need to operate in harsh operating conditions such as high temperatures , bad weather and frequent vibration.
Major requirement of an EV motor:
- High torque density and high power density
- Very wide speed range including constant torque and constant power regions
- High efficiency over wide torque and speed range
- Reliability & robustness
- Low cost
- Capable of being integrated with the engine.
- Good voltage regulation
Classification of EV motors:
- Commutator
- DC motors
- Self excited
- Series
- Shunt
- Separately excited
- Wound field
- Permanent Magnet excitation
- Commutator less
- Induction
- Wound rotor
- Cage rotor
- Synchronous
- Wound rotor
- PM rotor
- BrushLess DC
- Sinusoidal- Permanent Magnet Synchronous Motor
- Interior Permanent Magnet Synchronous Motor
- Reluctance rotor
- Doubly salient(both stator & rotor)
- Switched Reluctance Motor
- Stator PM(rotor without PM)
- Field Coil DSPM(field coil is embedded in stator)
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