SOLUTION

Disadvantage of BLDC motor

Cost: Rare-earth magnets are much more expensive than other magnets and result in an increased motor cost. Electronic equipment such as Hall sensor embedded in stator can also increase the cost.

Limited constant power range: A large constant power range is crucial to achieving high vehicle efficiencies. The permanent magnet BLDC motor is incapable of achieving a maximum speed greater than twice the base speed.

Magnet demagnetization: Magnets can be demagnetized by large opposing magnetomotive forces and high temperatures. The critical demagnetization force is different for each magnetic material. Great care must be brought to cooling the motor, especially if it is compactly built.

High-speed capability: The surface-mounted permanent magnet motors cannot reach high speeds because of the limited mechanical strength of the assembly between the rotor yoke and the permanent magnets.