Brushless DC MOTOR

In BLDC motor field winding is kept on _______________

• a) Stator

• b) Rotor

• c) Can be placed anywhere

• d) Absent

Which of the following is not an advantage of BLDC motor over conventional DC motor.

• a) Less maintenance

• b) Long life

• c) No risk of explosion or possibility of RF radiation

• d) Low cost

In medical fields which DC motor is widely used?

• a) PMDC

• b) BLDC

• c) Brushed DC motor

• d) Cannot be determined

Typical brushless motor doesn’t have ______________

• a) Commutator

• b) Permanent magnet

• c) Electronic controller

• d) Fixed armature

The Hall effect sensor is used as the rotor position sensor for the BLDC motor.

• a) True

• b) False

The speed of a BLDC motor can be controlled by __________

• a) Changing input DC voltage

• b) Changing temperature

• c) Changing wind direction

• d) Cannot be controlled

Due to low inertia, BLDC motors have __________

• a) Faster acceleration

• b) Slower acceleration

• c) High-cost

• d) Low cost

The function of commutator and brushes implemented by

• permanent magnet

• solid state drives

• slip rings

• field windings

In BLDC motors,elimination of commutator,brushes and slip rings results

• reduce the losses,complexity

• made low efficiency

• not pick up

• all the above

PMBLDC motor requires rotor position sensor

• TRUE

• FALSE