B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
364/34
B66B 1/30 (2006.01)
Patent
CA 1096073
29/15 ELEVATOR CONTROL APPARATUS ABSTRACT OF THE DISCLOSURE An elevator car control apparatus is disclosed in which a three-phase AC tachometer generator is coupled to a motor for driving an elevator car, and the AC output of the tachometer generator is full-wave rectified for use as a speed feedback voltage. A waveform-shaping circuit generates one pulse for each cycle of the output of the AC tachometer generator. A counter counts such pulses after the car has passed a deceleration-initiating point, thereby producing the number of counts proportional to a car running distance after the passage of the deceleration- initiating point. From this number of counts, a decelera- tion command voltage decreasing progressively in accordance with car positions is obtained by a decoder and a digital- analog converter. During deceleration, the car-drive motor is subjected to feedback control in accordance with the difference between the speed feedback voltage and the deceleration command voltage, thus effecting deceleration control of the elevator car.
295504
Hatakeyama Takanobu
Honzyo Chihiko
Iwasa Yuzaburo
Kameyama Tadao
Ohira Takeshi
Hitachi Ltd.
Kirby Eades Gale Baker
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