Mountable Package Incorporating Hall Effect Device to Monitor Blower Function
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
A Hall effect device is provided with a signal conditioning circuit to produce a TTL (transistor-transistor logic) compatible digital output and is positioned to monitor a rotating ring magnet. The magnet has multiple sets of poles facing radially outward. The ring magnet is attached to the flower rotor shaft between the motor and the scroll. The Hall effect device and its signal conditioning circuitry are encased in a small box-like package. The package is mounted on a bracket which, in turn, is mounted to the blower base plate. A Hall effect device is a semiconductor material that produces a voltage proportional to the strength of an applied magnetic flux. When monitoring a rotating multi-poled magnet it will produce a pulsed output.