Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
1997-12-04
2001-03-27
Hall, Carl E. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S732000, C029S760000
Reexamination Certificate
active
06205644
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a method of assembling an electric motor, and in particular to a method of assembling a motor from one direction without the need to turn the motor end over end to complete the assembly process.
BACKGROUND OF THE INVENTION
Electric motors are typically assembled in a multiple step process in which a housing, end shields, a stator, a rotor, and control electronics are combined. During a typical assembly process a motor might be positioned several times as the various components are assembled. This manipulation of the motor during the assembly process can be tiring to the assembly workers, could cause handling damage, and is time consuming reducing the production rate.
SUMMARY OF THE INVENTION
The present invention relates to a method of assembling motors from one direction that eliminates the need to reposition the motor during the assembly process. This makes the assembly process faster and easier, and thus reduces assembly costs and the final cost of the motor.
Generally, the method of assembling a motor of the present invention comprises the steps of providing a first housing section, placing a stator in the first housing section, placing a jig in the stator in the first housing section to position the stator within the first housing section, and securing the stator in the first housing section. The stator is preferably secured by injecting a settable material between the stator and the first housing section. The assembly process is completed by removing the jig, installing a rotor in the stator, and interfitting a second housing section with the first housing section and securing the first and second housing sections together.
The first housing section has a shaft opening for the motor shaft, and the jig comprises a shaft adapted to extend through the bearing in the shaft opening in the first housing and a body adapted to closely fit within the stator to accurately position the stator in the first housing section relative to the bearing in the shaft opening.
The first housing section preferably has at least one motor control component preinstalled therein and electrical connections are made between the stator and the components. The assembly process of the present invention is simple, and allows a motor to be quickly assembled in one direction from one end to the other, without the need to reposition the motor. The process reduces handling damage and the amount of labor required to complete the motor thereby reducing the cost of the assembly process and of the assembled motor.
REFERENCES:
patent: 2377965 (1945-06-01), Rataiczak
patent: 3165816 (1965-01-01), Thompson et al.
patent: 3268986 (1966-08-01), Lacy
patent: 3413715 (1968-12-01), Latussek et al.
patent: 3648230 (1972-03-01), Younkin
patent: 4793054 (1988-12-01), Abbratozzato et al.
patent: 5412270 (1995-05-01), Butcher et al.
patent: 5533815 (1996-07-01), Schierling et al.
patent: 5842271 (1998-12-01), Kawasaki et al.
Daniels Nicholas R.
Morgan Donald E.
Emerson Electric Co.
Hall Carl E.
Harness & Dickey & Pierce P.L.C.
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