Resistor device for controlling a rotational speed of a motor
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United States of America Patent
Stats
-
Oct 8, 1996
Grant Date -
N/A
app pub date -
Jul 1, 1994
filing date -
Jul 1, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a resistor device for controlling a rotational speed of a motor which has no directional property and provides a convenient setting. A resistance unit is positioned which includes at least four connecting points connected to connecting terminals at an upper predetermined position of a housing, and a heat sink having at least four supporting legs is provided to form passing paths open in all directions on the housing. Also, the resistance unit is adhered on the heat sink through an insulating layer, a second heat sink corresponding to the first heat sink is adhered on the resistance unit through the insulating layer, and short-circuit means having a soldered portion to be fused at a predetermined temperature upon an overloading of the motor is provided between the resistance unit and any one terminal. Accordingly, the present invention enables the resistor device to be freely positioned without a directional property and prevents heat by the short-circuit means from disturbing the resistor device.
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