Electricity: motive power systems – Plural diverse motor controls – Running-speed control
Patent
1990-02-12
1994-03-08
Wysocki, Jonathan
Electricity: motive power systems
Plural diverse motor controls
Running-speed control
388827, H02P 700
Patent
active
052931030
ABSTRACT:
A fan speed control adjusts the speed of an electric fan motor without producing audible noise at frequencies above about 60 Hz. A linear slide switch is positionable in each of four discrete positions to connect various capacitances in series with the motor to limit the power provided to the motor from an ac source. An actuator engaging the slide switch includes detents to urge the switch into each of the four positions. The urging force is a maximum approximately half-way between adjacent positions and decreases linearly to a minimum at each position. The maximum force necessary to move the switch from one position to the next is not greater than about 0.8 lb., to avoid overshoot when the actuator is operated by an extended arm.
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Lightolier Slide Fan Controls Brochure C. G. Veinott-Fractional and Subfractional Horsepower Electric Motors, Third Ed., McGraw-Hill, 1970, pp. 152-157.
Lutron Electronics Co. Inc.
Wysocki Jonathan
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