| 摘要 |
PROBLEM TO BE SOLVED: To offset load ripples optimally. SOLUTION: A control circuit 10 controls an inverter part 3 to change over the conduction of a brushless motor. A position detecting interval calculating part 10a divides one revolution into plural number of sections, and clocks the time of each section. Based on this clocked time, a torque pattern operation part 10e generates a correcting voltage for each section, and when a revolution command value is determined by varying the revolutions into stepped states, a pattern reducing part 10g reduces the correcting voltage of the prior step by a specified value for each step before generating a correcting voltage for the next step. In the step of the revolution command value, a pattern adjusting part 10f adjusts the correcting voltage by a specified value after the presumption of the correcting voltage is finished. Adding parts 10h, 10i, 10j add this correcting voltage to a PWM signal from a PWM signal generating part 10b. Based on this signal, a conduction changeover control part 10k outputs driving signals for the inverter part 3, and corrects a voltage pattern to be impressed to the brushless motor to offset load ripples. |
