Sensor brushless motor controller is the core part of motor controller, to understand the whole operation of the motor controller, understand its sensor is vital, but the sensor brushless motor controller not only is a kind of, the following is to introduce the classification of brushless motor controller sensors: position sensor with magnetic susceptibility, photoelectric and electromagnetic three types. 1. Adopts photoelectric position sensor brushless motor controller, in a certain position on the stator component is configured with a photoelectric sensor, mounted on the rotor screen, light source for light emitting diode or small light bulb. 2. Brushless motor controller, electromagnetic position sensor is in electromagnetic sensors are installed on the stator component parts, when permanent magnet rotor position changes, electromagnetic effect will make the electromagnetic sensor produces high frequency modulation signal. 3. Using magnetic susceptibility type position sensor brushless motor controller, the magnetic sensor installed on the stator component, used to detect magnetic fields produced by permanent magnets, the rotor rotates. Usually say that the distribution of permanent magnet synchronous motor with the stator three phase winding and the permanent magnet rotor, the magnetic circuit structure and distribution to ensure induction emf waveform is sine, plus the stator voltage and current are also should be sine wave, typically by ac variable pressure transducer. Permanent magnet synchronous motor control system often USES self-control type, also need to position feedback information, can use vector control (Field oriented control)Or direct torque control of advanced control strategy.
