Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1989-12-28
1991-08-27
Shoop, Jr., William M.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, 318473, 188299, 267 6415, 361 25, H02P 800
Patent
active
050436490
ABSTRACT:
A stepping motor unit includes a stepping motor of the type wherein the interior of the stepping motor is filled with an oil, a detector for detecting the temperature of the oil in the stepping motor, a device for varying an upper limiting value of the rotational speed of the stepping motor and an upper limiting value of the rotational acceleration of the stepping motor in view of a current viscous condition of the oil based on the temperature detected by the temperature detector, and a driver for driving the stepping motor at a rotational speed and a rotational acceleration which fall in ranges, respectively, not exceeding the upper limiting values. The stepping motor unit thus constructed has rapid and accurate response characteristics and is capable of operating reliably without falling out of step even when the environmental temperature varies in a very wide range. A rotary control valve incorporating such stepping motor unit is also disclosed.
REFERENCES:
patent: 4053196 (1977-10-01), Dunaway
patent: 4320431 (1982-03-01), Bell
patent: 4721894 (1988-01-01), Graber
patent: 4813519 (1989-03-01), Matsubara et al.
patent: 4926077 (1990-05-01), Gauthier et al.
Asai Jirou
Kozawa Kiyomitsu
Kuroyanagi Masatoshi
Murakami Fumiaki
Natsume Yoshimi
Bergmann Saul M.
Nippondenso Co. Ltd.
Shoop Jr. William M.
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