| 摘要 |
PURPOSE:To stabilize output torque even on the low torque side when output torque is reduced and output torque is varied extending over a wide range by changing the phase of a command signal for currents made to flow through a winding in response to a torque limiting value and increasing reactive currents. CONSTITUTION:A torque limiting value is converted into a phase shift signal Vr by a D/A converter 31, and multiplied by multiplying D/A converters 24, 25 and correction current commands RTC', TTC' having V phase and W phase are outputted, and a correction phase current command STC' having V phase is outputted. Each phase current command RTC, STC, TTC and respective correction phase current command RTC', TTC', STC' are each inputted to phase shift circuits 27, 28, 29, and outputted as phase current commands corrected RT, ST, TT. Accordingly, since the phase current commands are corrected by the torque limiting value, phase of driving currents advances, and reactive current components increase, thus reducing output torque from a motor M. |
