| 摘要 |
PURPOSE:To attenuate torque pulsation in an intermittent starting area, by advancing the angle of advance for a first converting means among two frequency-converting means, in a specified range, and by delaying a second converting means after the first converting means, to be 6-pulse-formed. CONSTITUTION:A synchronous motor 4 is controlling by the respective inverters 3-1, 3-2 of a first and a second frequency converters 31, 32. A plurality of position detecting sensors for the synchronous motor 4 are fixed on a sensor fitting table, and are arranged in the radial direction to be confronted with rotating position rings, and are turned ON/OFF every 180 deg. at the electrical angle, and are regulated to have the phase difference of every 60 deg. in order. Then, to set the angle P0 of lead for the gate signal of the first frequency converter 31, in a range of 0 deg.-60 deg., the sensor fitting table is advanced by 0 deg.-60 deg. at the electrical angle in the counter direction against the rotating direction of the synchronous motor 4, and gate signal to the second frequency converter 32 is delayed in the range 0 deg.-60 deg.. |
