Patent ID: 6597140
Filing Date: 2003-07-22
Classification: G11B,H02P

Abstract:
A sensorless motor starting system comprising:a mode setting means for selectively setting either a start acceleration mode or a fixed frequency mode for the sensorless motor; an automatic parameter setting means for setting, in said sensorless motor, start parameters to specify the start-time driving conditions preset correspondingly to the motor characteristic and a load to be driven; an automatic motor starting means for starting the rotation of said sensorless motor in an automatic mode on the basis of the start-time driving conditions specified by the start parameters set by said automatic parameter setting means; a start state decision means for making a decision as to whether the start state of said sensorless motor started by said automatic motor starting means is coincident or not with a target start state; and a start parameter setting mode change means for canceling the start executed by said automatic motor starting means when the result of the decision obtained from said start state decision means signifies a deviation of the sensorless motor start state from the target start state, and then changing the setting of the start parameters to a manual setting mode.