Week 3 Session 7
Compare the different motors used in EV and list down the advantages and disadvantages of each.
| Motors | Advantages | Disadvantages |
|
DC Series Motor(Indian Railways) |
High starting torque capability easy speed control withstand a sudden increase in load |
high maintenance due to brushes and commutators. |
|
Brushless DC Motor(three-wheeler manufacturers like Goenka Electric Motors, Speedo Vehicles, Kinetic Green, and Volta Automotive) |
high starting torque, high efficiency around 95-98%, high power density design approach. |
high cost due to permanent magnets. Overloading the motor beyond a certain limit reduces the life of permanent magnets due to thermal conditions. |
| Permanent Magnet Synchronous Motor (PMSM) (Toyota Prius, Chevrolet Bolt EV, Ford Focus Electric, zero motorcycles S/SR, Nissan Leaf, Hinda Accord, BMW i3, ) | high power density and high efficiency. | high cost due to permanent magnets. |
|
Three-Phase AC Induction Motors(Tesla Model S, Mahindra Reva e2o) |
long life less maintenance, Higher efficiency 92-95% can withstand rugged environmental conditions. |
requires a complex inverter circuit and control of the motor is difficult. |