| 摘要 |
PURPOSE:To detect rotational speed of DC motor without requiring speed detector. CONSTITUTION:Armature voltage, armature current and field current detected through sensors 6, 17, 18, externally provided overall armature resistance and proportional coefficient inherent to a DC motor are fed to a speed detecting means 26 which then performs operation 1 or 2 thus detecting the rotational speed of the DC motor. |
