Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1982-12-28
1985-05-21
Weldon, Ulysses
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318314, 318318, 318326, 323281, G05B 500
Patent
active
045189013
ABSTRACT:
A motor control apparatus for driving and controlling a motor, in which a signal frequency proportional to a rotation number of the motor is converted into a d.c. voltage by a frequency/voltage converter so as to drive and control the motor by the d.c. voltage. The apparatus comprises a first, a second, and a third pulse generator for successively producing a first, a second, and a third repetitive pulse, respectively, in response to a signal period proportional to the rotation number of the motor; a constant current source; a first reset circuit driven by the third pulse to reset an output current of the constant current source; a first capacitor connected to the first reset circuit in parallel with the first reset circuit and charged by the output current of the constant current source; a sampling circuit driven by the second pulse to derive a saw tooth wave signal appearing across the first capacitor; a second reset circuit driven by the first pulse; a second capacitor connected to the second reset circuit in parallel therewith for charging the saw tooth wave signal through the sampling circuit; and a circuit for changing a pulse width of at least one of the first, second and third pulses substantially in accordance with the output current of the constant current source.
REFERENCES:
patent: 3602825 (1971-08-01), Senior
patent: 3867647 (1975-02-01), Callahan et al.
patent: 4338554 (1982-07-01), Fukushima et al.
patent: 4366399 (1982-12-01), Furuhata
Fukushima Isao
Kobori Yasunori
Masuda Yoshinori
Nishijima Hideo
Hitachi , Ltd.
Weldon Ulysses
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