| 摘要 |
PURPOSE:To enable to efficiently control to drive a brushless motor even at a heavy load time by generating a current control signal having a phase displacement corrected in response to the variation in the armature current proportional to a load torque. CONSTITUTION:When a load of motor 1 becomes heavy, the rotating speed decreases, the voltage e increases, and the phase displacements (delta) of voltage e10, e20 increase. Thus, the phase displacements (delta) in digital data Da-DC also increase. As a result, the effective value and the phase displacement (delta) of high level signals of the digital signals D1-D6 increase. The current value increases for the armature winding of a motor 1 from a power converter 17, and armature currents IU, IV, IW in which the phase difference phi between the equivalent armature currents and the induced power becomes zero are supplied. Thus, the torque generated from the motor 1 increases to maintain the efficiently operating state. |
