Electricity: motive power systems – Automatic and/or with time-delay means – Motor load – armature or primary or secondary circuit current
Patent
1987-07-31
1988-04-19
Ro, Bentsu
Electricity: motive power systems
Automatic and/or with time-delay means
Motor load, armature or primary or secondary circuit current
318 3, 318558, 62344, 221 75, H02P 100, F25C 516
Patent
active
047392339
ABSTRACT:
A motor control for a refrigeration apparatus having a cabinet, a door to the cabinet, a source of ice pieces located in the cabinet, means located in the door for dispensing the ice pieces, a power source having a supply terminal and a ground, a motor and means responsive to operation of the motor for delivering the ice pieces from the source of the ice pieces to the dispensing means, the motor control comprising means for energizing the motor, an actuable ice command switch generating an ice command signal for requesting delivery of the ice pieces from the source to the dispensing means, a processor having an input terminal coupled to the ice command switch and an output terminal, the processor generating a transistor command signal in response to the ice command signal, and a transistor having a control electrode coupled to the output terminal and first and second main current electrodes, wherein the processor output terminal is coupled to the transistor control electrode, and the motor energizing means, the ice command switch and the transistor first and second main current electrodes are coupled in series between the supply terminal and ground such that the transistor is actuated in response to the transistor command signal and current flows through the motor energizing means to energize the motor only upon actuation of both the ice command switch and the transistor.
REFERENCES:
patent: 3299656 (1967-01-01), Linstromberg et al.
patent: 4104889 (1978-08-01), Hoenisch
patent: 4417671 (1983-11-01), Kawasaki et al.
patent: 4424683 (1984-01-01), Manson
patent: 4628699 (1986-12-01), Mawby et al.
Ro Bentsu
Whirlpool Corporation
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