The Hall Effect Sensor Is Used As The Rotor Position Sensor For The Bldc Motor

Let s understand the significance of this sensor in an automotive motor control system.

The hall effect sensor is used as the rotor position sensor for the bldc motor.

A bldc motor control system is a complicated circuit where several components work in tandem to make the motor move in a desired manner. Efficiency durability and performance are the attributes that concern the engineers the most while designing such a system. Some bldc brushless dc motors are equipped with three internal hall effect sensors that provide feedback to external circuits that facilitate precise control of the magnetic coils in the stator. In the bldc motor the hall sensor detects the position of the rotor s rotating magnetic field and provides the corresponding winding excitation through the logic and driving circuit.

A hall effect sensor is a widely used sensor that provides rotor position feedback to a motor controller. Hall effect sensors are the most common method of determining rotor position in bldc motors due to their low cost and ease of use with the permanent magnets of the rotor. Common magnetic sensor hall components or hall integrated circuit magnetic resistor and magnetic diode etc. The basic principles are hall effect and magnetoresistance effect.

Some types of bldc controllers use the motor s intrinsic back emf leaving the hall effect sensors unused. Hall sensor sequence calibration of bldc motor open example this example calculates the hall sensor sequence with respect to position zero of the rotor in open loop control. On the whole the winding responses according to the magnetic field of the electric motor s permanent magnet thus generating the required torque. In the brushed dc motor the commutator realizes commutation of the armature current and seeking of a suitable magnetic field by switching to the armature current.