| 摘要 |
PURPOSE:To accurately calculate the torque of a DC motor by multiplying a crossing magnetic flux obtained on the basis of a rotating speed, a terminal voltage and an armature current by the armature current to calculate the torque of the motor. CONSTITUTION:A correcting voltage generator 8 obtains a correction voltage EA from an armature current IA. An arithmetic unit 9 subtracts or adds the voltage EA from or to a terminal voltage V in response to a power drive command or a brake command to obtain an induced electromotive force E caused by its armature. A divider 10 divides the electromotive force E by a rotating speed omega to obtain a crossing magnetic flux phi. A multiplier 5 multiplies the magnetic flux phi by the current IA to calculate a torque T. Thus, the torque can be accurately calculated. |
