Three phase full wave brushless DC motor and its driving method foundation
Three phase full wave brushless DC motor and its driving method foundation
1、 Overview of Three phase Full wave Brushless DC Motor
1.1 Three phase full wave brushless DC motor
Brushless DC motor is an electric motor based on electronic commutation technology. Compared with traditional brushed DC motors, brushless DC motors have higher efficiency, lower noise, and longer service life. The three-phase full wave brushless DC motor is a common type of brushless motor, which is powered by a three-phase AC power supply and controlled by an electronic commutator to achieve the rotation of the motor rotor.
2、 Principle of three-phase full wave brushless DC motor
2.1 Motor Structure
A three-phase full wave brushless DC motor consists of a stator and a rotor. There are three sets of windings on the stator, which are connected to different AC power sources, while the rotor is equipped with permanent magnets or other magnetic materials.
2.2 Electronic commutator
Electronic commutator is a key component for controlling the phase sequence of brushless DC motors, usually using Hall sensors or encoders to detect the rotor position and accurately control the direction of current flow.
2.3 Working principle
The working principle of a three-phase full wave brushless DC motor is based on the laws of electromagnetic induction and Lorentz force. By changing the direction of current between the stator windings, a rotating magnetic field is generated to drive the rotor to rotate.
3、 Brushless DC motor driving method
3.1 Level Control
Level control is achieved by controlling the current magnitude and direction of each phase winding to control the motor speed and torque.
3.2 Sampling Control
Sampling control is achieved by periodically sampling rotor position information, adjusting current flow direction, and achieving precise motor control.
3.3 Magnetic field orientation control
Magnetic field orientation control is the precise calculation of the direction and magnitude of the magnetic field to achieve precise control of the position and speed of the motor rotor.
4、 Application Fields and Prospects
4.1 Application Fields
Three phase full wave brushless DC motors and their driving methods are widely used in fields such as electric vehicles, industrial machinery, and household appliances, becoming a key component of modern electrification technology.
