Patent ID: 6025691
Filing Date: 2000-02-15
Classification: B60L,H02P,Y02T

Abstract:
A synchronous motor control system for supplying n-phase alternating currents to respective phase coils of a synchronous motor to activate and rotate said synchronous motor, wherein n is an integer greater than two and each current has a sine wave as a basic waveform, said synchronous motor control system comprising:an electrical angle measurement device configured to measure an electrical angle of each phase current of said n-phase alternating currents;phase current modification device configured to execute a modification of a predetermined phase current over a range of .+-.180/2.multidot.n degrees from a specified electrical angle, at which said predetermined phase current having a sine-wave curve reaches a peak value, based on said electrical angle measured by said electrical angle measurement device, said peak value of said sine-wave curve being a limit of said modification; anda balancing mechanism configured to change phase currents other than said predetermined phase current which is subject to said modification by said phase current modification device, thereby balancing a sum of all said phase currents.