Bldc Motor With Hall Sensor

It serves as an example of a bldc motor control system design using one of the latest member of freescale dscs.

Bldc motor with hall sensor.

Bipolar hall effect sensors are used in bldc motors to detect the position of the rotating magnet. 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. Bldc motors typically have three hall effect sensors mounted either to the stator or to the rotor and use what is known as six step commutation. A bldc motor control system is a complicated circuit where several components work in tandem to make the motor move in a desired manner.

A hall effect sensor is a widely used sensor that provides rotor position feedback to a motor controller. In this example an eight pole motor with a three phase winding uses three bipolar latching hall effect sensors. When the rotor passes a sensor it produces either a high or a low signal to indicate which rotor pole n or s has passed. Sensored bldc motor uses hall effect sensors to detect rotor position where as the sensorless bldc motor uses another technique which is bemf back electromotive force.

Some types of bldc controllers use the motor s intrinsic back emf leaving the hall effect sensors unused. Its function is to detect the position of the main rotor in the process of motion. On the whole the winding responses according to the magnetic field of the electric motor s permanent magnet thus generating the required torque. It also illustrates an intelligible implementation of a bldc control technique using dsc features.

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. The bldc motor used in this project is just a pc cd rom motor spindle motor. The bldc motor s default phase is usually caused by damage of hall sensor. The concept of the application is to create a speed closed loop bldc driver using a hall position sensor.

Hall position sensor is one of the three major parts of the bldc motor system and it is also the main symbol different from the brushed dc motors.