초록 ▼

An energy efficient low-power integral electronically commutated fan motor and control circuit assembly mounted on a circuit board for use in refrigerators utilizing a Hall sensor to provide positional control signals for sequential energization of the windings with the Hall sensor energization bein

An energy efficient low-power integral electronically commutated fan motor and control circuit assembly mounted on a circuit board for use in refrigerators utilizing a Hall sensor to provide positional control signals for sequential energization of the windings with the Hall sensor energization being pulsed, and the motor stator windings energized only during a portion of the period, when rotational torque produced by the energization is greatest in order to reduce the power input to the assembly. Integrally molded multi-function components including the coil bobbin, ground pin, Hall sensor holder, motor bearing oil well covers, and assembly housing provide positioning, support, and securing assistance along with electrical and magnetic operative connections and positioning. A capacitively coupled bridge power supply is provided to further reduce power consumption, and the motor is protected under fault and stall conditions by a current limiting circuit and a timed retry circuit, and the rotor and stator are designed for adequate starting torque in a refrigerator. Power is supplied to the motor windings through a voltage dropping capacitor connected in series therewith.

대표청구항 ▼

[ What we claim as new and desire to secure by Letters Patent of the United States is:] [1.]1. A high-efficiency low-power integrated and unitary fan motor and control assembly suitable for use in refrigeration systems comprising an electronically commutated DC motor, a control and power circuit, an

[ What we claim as new and desire to secure by Letters Patent of the United States is:] [1.]1. A high-efficiency low-power integrated and unitary fan motor and control assembly suitable for use in refrigeration systems comprising an electronically commutated DC motor, a control and power circuit, and a substrate carrying a plurality of electronic components and interconnections of such circuit;said electronically commutated motor including a stator core, a permanent magnet rotor, and at least one winding inductively coupled with said stator core;a Hall sensor mounted on said substrate and forming part of said circuit, and positioned in magnetic coupling relationship with said permanent magnet rotor to sense rotation of said rotor;said circuit including at least one DC power supply, and switching means to provide power to said at least one winding during a cycle of applied power defined by signals from said Hall device; andsaid control circuit determining periods of reduced magnetic coupling between the rotor and stator during the cycle of applied power and inhibiting the supply of power to said at least one winding during the determined periods of reduced magnetic coupling, thereby to decrease the total amount of power supplied to the at least one winding and to increase the efficiency of the motor and control.