| 摘要 |
PURPOSE:To prevent torque from being generated in the opposite direction to that intended by detecting the period from current command start to a detection of zero current, calculating the difference between the detected period and that of the width of the width of an 180-degree electric angle, and controlling the current flowing period by the difference. CONSTITUTION:A current flowing period is adjusted by detecting at least one phase the period from current start to a detection of zero current in the phase, calculating the difference between the detected period and that of the width of an 180-degree electric angle where torque having an originally intended direction is generated, and using this difference. For example, if the detected period is longer than that of the width of the 180-degree electric angle, the current flowing period is shortened to that extent. And if the detected period is longer, the current flowing period is lengthened to that extent. By doing this processing in every one cycle of a current flowing angle likewise, the winding current of every phase flows only during the period of the width of an 180-degree electric angle where torque having an intended direction is generated. |
