The position of shaft in brushless DC motors is determined by _____.

Brushless DC Motor

• A brushless DC motor is an electronically commuted DC motor which does not have brushes.
• A brushless DC motor avoids the need for a commutator and brushes by having its permanent magnets in the rotor.
• Rotation of the rotor is maintained by detecting the position of the rotor magnetic poles and switching the electric current flow through the coils accordingly.
• For this reason, a brushless DC motor requires a driver (an electronic drive circuit).
• The detection of rotor shaft position is done using a hall effect sensor or other magnetic sensors.
• Hall effect sensors uses the hall effect to determine magnetic field strength.
• By converting this into an electrical signal, the driver is able to detect the position of the permanent magnet (the orientation of its north and south poles) and switches the electric current flow through its coils in such a way that it keeps the motor shaft rotating.