| 摘要 |
<p>PURPOSE:To drive a motor of the electric automobile at the highest efficiency by a method wherein a torque command necessary to drive the electric automobile is generated in accordance with an accelerator opening degree and a rotational frequency of the motor, and the combination of a magnetic field current and an armature current is outputted as to obtain the highest efficiency responding to the torque command. CONSTITUTION:When a torque command generator circuit 2 inputs the accelerator opening degree theta outputted from an accelerator 1 and the rotational speed N of the motor outputted from a speed generator 3, an output responding to the accelerator opening degree is outputted in the speed range less than the prescribed speed determined at every accelerator opening degree, and an output responding to the accelerator opening degree is reduced in the speed range more than the prescribed speed in accordance with the increase of speed and is outputted respectively to generate the torque command tauc. A pattern generator circuit 4 outputs an armature current command imc and a magnetic field current command ifc as to generate the least loss responding to the torque command tauc, and applies to an armature control circuit 7 and a magnetic field control circuit 8.</p> |
