US Patent:
20040080288, Apr 29, 2004
Inventors:
Kiyoshi Ina - Commerce Township MI, US
International Classification:
H02P007/38
Abstract:
A ventilation system () made up of a wiring harness (), a power source (), a fan motor (), a resistance circuit (), and a selector switch (-or ) is taught. The selector switch (or ) has five or six positions, and determines a different current through the fan motor () for each position. The resistance circuit () limits the current in three or four of the positions. A control apparatus () is mechanically coupled to the selector switch () and configured to allow a user to select one of the positions. One of the positions is an “off” position passing zero current through the fan motor (), and one of the positions is a “maximum” position passing a maximum current through the fan motor (). Each of the other positions is intermediate and passes a current through the fan motor () and a resistance in the resistance circuit () to limit the current.