 Apparatus and method of encapsulating motors |
| OF SPECIFIC EMBODIMENTS In preferred embodiments of the invention, an improved method and ... |
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| Cooling fan |
| The main objective of the invention is to provide a cooling fan which can prevent dust from ... |
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| Using a micromachined magnetostatic relay in commutating a DC motor |
| FIGS. 1A and 1B show a normally-open microelectronic mechanical system (MEMS) relay or switch 100. ... |
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| Permanent magnet field-type rotating machine |
| With the above problems in view, it is an object of this invention to provide a permanent magnet ... |
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| Plain carbon steel hub for data storage device |
| The present invention provides a rotating removable data storage device having a hub of coated ... |
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| Disk storage device with improved spindle torque and acceleration |
| The foregoing and other objects are achieved by providing a disk storage device that utilizes an ... |
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| Magneto generator |
| An object of the present invention is to provide a magneto generator capable of blowing cooling air ... |
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| Alternator for vehicles having permanent magnets in rotor |
| The present invention addresses this problem, and has an object to improve electric power generated ... |
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| Compliant vibration isolation housing assembly for a data storage system |
| The present invention is a vibration isolation apparatus and method for attenuating vibrations in a ... |
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| Apparatus for absorbing stator vibrations in computer storage apparatus |
| Accordingly, one object of the present invention is to provide a rotary driving apparatus that ... |
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Integral motor and control
| Details |
Inventors: Erdman, David M.; Yoder, Dale F.; Tatman, Richard S.; Molnar, David T.;
Assignee: General Electric Company (Schenectady, NY)
Primary Examiner: Tamai; Karl
Assistant Examiner:
Attorney, Agent or Firm: Wasserbauer, Esq.; Damian, Teasdale LLP; Armstrong
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. |
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DETAILED DESCRIPTION What is claimed is: 1.
A refrigeration system comprising a compressor, a refrigerant carrying condenser coil, a refrigerant carrying evaporator coil, and at least one air moving motor assembly for moving air across at least one of said refrigerant carrying coils; said air moving motor assembly comprising a brushless DC motor having a permanently magnetizable rotor magnetized to establish at least one north and at least one south pole with a magnetic transition region located between adjacent north and south rotor poles, a C-frame ferromagnetic stator core defining a rotor accommodating bore, and a plurality of energizable winding turns disposed about a portion of the stator core for establishing alternating north and south magnetic poles in the stator core at locations adjacent to the bore; said stator core including a pocket for receiving a magnetic flux sensing device, and said bore having a discontinuity therealong so that magnetic flux associated with the rotor is not shielded from the pocket by ferromagnetic stator core material; said bore further including at least two stepped regions each having an arcuate extent of about thirty-five degrees, with the depth of the step in each of the two stepped regions being at least about 1.
0 mm; and said bore further having a region establishing a magnetic flux path anomoly at a location on the bore opposite the location of the bore discontinuity.
2.
The system of claim 1 wherein the rotor is comprised of at least three magnet segments, and wherein any magnetic transition region located along any given magnet segment is located at least about 30.
degree.
from an edge of said given segment.
3.
The system of claim 1 wherein the air moving motor assembly comprises a condenser fan motor and control; said control includes at least one motor stall protection circuit element, at least one circuit element for protecting the motor from overcurrent conditions, and at least one circuit element for inhibiting the supply of power to the motor during a portion of each revolution of the rotor during at least part of the interval during a revolution that corresponds to reduced magnetic coupling between the rotor and stator
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