| 摘要 |
<p>1,076,624. Automatic control of electric motors. MATERIEL ELECTRIQUE S.W. Nov.13, 1964 [Nov.15, 1963; Oct. 19, 1964], No.46314/64. Heading G3R. The acceleration of a D. C. motor, which is supplied through a rectifier-inverter, is controlled by a phase-shift circuit 6 connected to an integralproportional amplifier 7 receiving reference signal Io and signal Is representing the armature current of the motor. The signal Io is derived from proportional amplifier 8 receiving a reference signal e from amplifier 9 and speed-signal es from tachometer generator 5. The amplifier 9 has integral action, the signal e varying as a function of time, an input signal Ao being obtained from proportional amplifier 10 which compares reference signal Vo with speed-signal Vs. When the currentsignal Is exceeds a threshold value set by signal Ilo, an error signal Vs is fed back to amplifier 9 through integral-proportional amplifier 11. This adjusts the value of the signal e to a suitable initial value after the motor has been overloaded.</p> |
