Brushless DC motor having opposed pairs of axial magnetic field type permanent magnets and control system therefor

摘要

A brushless DC motor includes opposed pairs of axial magnetic field type permanent-magnets. Two opposed stators are axially arranged at two opposite sides of a rotor, each and stator includes a plurality of equiangularly spaced electromagnetic zones and in least one winding at each electromagnetic zone. A control system is provided to detect phase angle and the revolving speed of the rotor through a sensor and to control the connection of DC current to each winding and its direction, enabling the windings in the electromagnetic zones to form with the rotor at least one motor. By means of detecting speed change of the rotor through the sensor, the control system controls the opposed pairs of axial magnetic field type permanent-magnet brushless DC motor to operate under different motor operation combinations and to output different torques.