 Magnetic disc unit |
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| Disk driving motor and chucking mechanism for disk drive apparatus |
| It is an object of the present invention to simplify the configuration of a disk driving motor ... |
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| Bearing system with flexible bearing bracket |
| The present invention provides a bearing system comprising a bearing supported in a flexible ... |
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| Internally damped stator, rotor, and transformer and a method of making |
| The present invention provides in one embodiment an internally damped core, wherein the core is ... |
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| Electric rotating machine for vehicle |
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| Electric motor construction |
| I claim: 1. An electric motor comprising a housing means, said housing means including first and ... |
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| Insulated electrical conductor containing free-flowing mica |
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| Molecular vacuum pump with a gas-cooled rotor |
| This and other objects of the invention, which will become apparent hereinafter, are achieved by ... |
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| Hydrodynamic type porous oil-impregnated bearing and bearing device |
| Objects of the invention are: (1) To reduce the number of parts of the bearing to 2, while reducing ... |
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| Tangential torque support |
| Referring to FIG. 1, a superconducting rotating machine 10 has a stator assembly 12 including ... |
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Apparatus and method of encapsulating motors
| Details |
Inventors: Brown, Fred A.;
Assignee: Comair Rotron, Inc. (San Diego, CA)
Primary Examiner: Ortiz; Angela
Assistant Examiner:
Attorney, Agent or Firm: Bromberg & Sunstein LLP
An apparatus and method of fabricating an electric motor encapsulates the major assemblies of the motor in protective encapsulating material. The method begins by assembling a blade and housing, a motor stator, a motor rotor and associated control circuitry into a complete electric fan. The operational characteristics of the complete fan are then tested to verify proper operation. The blade and rotor assemblies are then removed from the complete fan so that a mold may be positioned onto the fan. Encapsulating material is injected into the mold so as to encase the fan in the encapsulating material. The mold is removed and the blade and rotor assemblies are reinserted. Embodiments may use various encapsulating materials such as urethanes, silicones, or epoxies. |
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DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS In preferred embodiments of the invention, an improved method and apparatus envelops an electric motor and its associated electronics in encapsulating material.
A preferred embodiment of the invention avoids drawbacks of conventional conformal coatings since the encapsulating material may be selected to dissipate heat adequately for the broad thermal cycling range of electric motors.
In addition, the encapsulating material, is substantially thicker than conformal coatings and completely envelops the various component parts of the motor, offering significant protection against the effects of vibration and mechanical shock.
For example, component fatigue failures due to vibration-caused work hardening may be significantly reduced.
A preferred embodiment also offers significant savings because the motor can be completely assembled and pretested in its housing prior to encapsulation, thus ensuring the electrical and mechanical integrity of the motor prior to encapsulation.
If the motor is determined to be defective, then it is not encapsulated, consequently saving time and manufacturing costs.
FIG.
1 is a perspective view of the component parts of a typical electric motor that may be utilized with preferred embodiments of the invention.
The motor, in this case, is implemented as a brushless direct current fan 10, as described in Brown, U.
S.
Pat.
No.
4,656,553.
The fan's motor, generally designated 15, is centrally located within a housing 11 having a front surface 12, a rear surface 13, and a venturi 14 extending between the front and rear surfaces.
A stator and control circuit are supported in fixed relation to the housing 12 in a central housing section 16 connected to the venturi by struts 17 of a spider structure.
Leads 19, 20, and 21 are brought out from the motor electronics along one strut 17' specially formed for this purpose with a longitudinal channel leading to a narrow groove 23 at the outer periphery of the motor housing 12.
The groove contains the leads in the channel while directing them toward the generally cylindrical exterior 25 of the housing 11 as shown
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Generators or Motors 
