Appeal No. 1998-0507
Application No. 08/457,701
evaporator fan motor in refrigerator systems, is disclosed. A direct current electronically
commutated DC fan motor is integrally assembled on a circuit board that also carries
control circuit elements, with a portion of the motor passing through a region of the circuit
board, with a stator coil positioned to one side of the rotor and with electronic components
positioned to the other side of the rotor. The preferred embodiment uses a Hall sensor to
sense the angular position of the rotor to control the commutation of the windings. The Hall
sensor is pulsed during a portion of each cycle of operation and its output is sampled for
operation and control of the motor in order to provide increased efficiency.
Representative independent claim 21 is reproduced as follows:
21. A motor and control assembly comprising:
an electronically commutated DC motor;
said electronically commutated motor including a stator core, a
permanent magnet rotor and at least one winding magnetically coupled to
said stator core;
a Hall sensor, for sensing rotation of said rotor, positioned in
magnetic coupling relationship with said permanent magnet rotor;
said assembly including electronic components, a DC power supply,
and switching means for delivering power from said DC power supply to
said at least one winding in response to signals from said Hall sensor;
said control assembly also including means for pulsing energizing
power supplied to said Hall device when said at least one winding is
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