Domestic high power brushless dc motor manufacturers have? by permanent magnet brushless dc motor, multipolar winding of the stator and rotor position sensor, etc. Position sensing according to the change of rotor position, along a certain sequence of stator winding current converter (By detecting the rotor magnetic pole relative to the position of the stator winding, and in determining the location of the position sensor signal, the signal conversion circuit to control the power switch circuit, after processing within the rotor brushless motor, according to certain logic relation between winding current switch)。 The working voltage of stator winding electronic switching circuit controlled by the position sensor output.
generally want to use the brushless dc motor in the speed can be stable in value when the load changes will not change speed control, so the motor can be induced magnetic field of hall sensor mounted inside of this motor, as the speed of the closed loop control, and at the same time as the basis of phase sequence control. But that is only used as a speed control and is not to be used as a positioning control.
brushless dc motor is to use semiconductor switching device to realize the electronic commutation, with electronic switching device instead of traditional contact commutator and brush. Brushless dc motor has high reliability, no commutation spark, and low mechanical noise, widely used in high-end audio, video, electronic equipment and office automation equipment.
