| 摘要 |
<p>PURPOSE:To obtain necessary set torque and enable motor loss to be minimized, by regulating both motor flux and torque current, and by controlling primary current. CONSTITUTION:By a torque arithmetic-unit 12, necessary set torque T* is performed arithmetic according to the running command and running conditions off car bodies. By an efficiency optimizing circuit 14, optimum motor flux phi*for minimum motor loss to obtain the necessary set torque T* based on the set torque T* and motor frequency fm is found, and after that, with magnet izing current to obtain the optimum motor flux phit*, transient motor flux phi*to a degree that the variation delay of motor flux does not exceed a specified value is performed arithmetic step by step, and according to the transient motor fluxphit*, transient torque current Iq' is performed arithmetic. By a vector arithmetic-circuit 16, motor voltage V1 and slip frequency fs are performed arithmetic according to the transient motor flux phit* and the transient torque current Iq' and the like.</p> |
