Metal working – Method of mechanical manufacture – Electrical device making
Patent
1997-01-08
1999-04-20
Moon, Daniel B.
Metal working
Method of mechanical manufacture
Electrical device making
310 42, H02K 1514
Patent
active
058946535
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method of machining a mounting surface of a motor frame body, which is to be in direct contact with a surface of an object to which a motor is mounted, and to a motor for which the method of machining the mounting surface is applied.
BACKGROUND ART
Referring to FIGS. 2 and 3, a description will now be given of one illustrative method of machining (specially finishing) a mounting surface of a motor frame body, and one illustrative motor for which the method of machining is applied.
The motor includes a stator 14 having a stator core 12 with a winding 10 wound thereon, a rotor 20 having a rotor core 18 secured to a shaft 16, and a frame body (i.e., a front frame 22 and a rear frame 24) to fixedly hold the stator core 12 therebetween in an axial direction.
The stator core 12 and the rotor core 18 include a laminated product of magnetic thin film such as silicon steel plate. The front frame 22 and the rear frame 24 include ring-like members made of metal such as aluminum. A ring-like front bearing housing 30 and a ring-like rear bearing housing 32 are respectively fixedly disposed in central openings 26 and 28 provided in the frames 22 and 24. Both the bearing housings 30 and 32 rotatably support the shaft 16 through a front bearing 34 and a rear bearing 36. It is thereby possible to rotatably support the rotor 20 by the front frame 22 and the rear frame 24 while forming fine clearances between an outer peripheral surface of the rotor core 18 and an inner peripheral surface of the stator core 12.
The central opening 26 in the front frame 22 has a smaller inner diameter than an outer diameter of the rotor 20, and the central opening 28 in the rear frame 24 has a larger inner diameter than the outer diameter of the rotor 20. Therefore, in the motor assembling process, the stator 14 is first fixed to the front frame 22 on which the front bearing housing 30 is previously mounted, and the rear frame 24 with the rear bearing housing removed therefrom. Subsequently, the rotor 20 with the front bearing 34 and the rear bearing 36 secured to the vicinity of both ends of the shaft 16 is inserted into the stator 14 through the central opening 28 in the rear frame 24. After the front bearing 34 is inserted into the front bearing housing 30, the rear bearing housing 32 is inserted into the central opening 28 in the rear frame 24 to be fixed to the rear frame 24 while inserting the rear bearing 36 into the rear bearing housing 32. The front bearing housing 30 serves as a spacer to smooth a difference in diameter between the central opening 26 in the front frame 22 and the front bearing 34. Thus, the front bearing housing 30 may appropriately be replaced or omitted depending upon a variation in dimension of the front bearing, which is required according to an operating specification of the motor.
The front frame 22 is disposed on the side of a load of the shaft 16, and is provided with a flange 38 radially outwardly extending from its front end spaced apart from the stator core 12. The flange 38 forms a mounting area for mounting the motor on an object, and has through-holes 40 into which mounting bolts (not shown) are inserted. Further, the front frame 22 is provided with a cylindrical socket portion 42 axially forwardly extending beyond the flange 38. The socket portion 42 engages a peripheral edge of a motor receiving hole provided in the object (not shown) on which the motor is mounted, resulting in relative alignment (such as centering) between the shaft 16 and a driven body.
In the front frame 22, an axial front end surface 38a of the flange 38 and a radial outer peripheral surface 42a of the socket portion 42 are machined for a surface finish to serve as mounting surfaces to make direct contact with the surface of the object on which the motor is mounted, and enable mounting of the motor with a relationship appropriately maintained between the shaft 16 and the driven body. In the prior-art motor assembling/manufacturing process, the finishing operation has been carried ou
REFERENCES:
patent: 5678299 (1997-10-01), Mochizuki
patent: 5758404 (1998-06-01), Baumann
Katsuzawa Yukio
Masuya Michi
Nakamura Kosei
Sadatsuki Akio
Calve James P.
Fanuc Ltd.
Moon Daniel B.
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