Method of constructing a dynamoelectric machine

• US 4,862,581 A
• Filed: 04/04/1988
• Issued: 09/05/1989
• Est. Priority Date: 04/14/1982
• Status: Expired due to Fees

• Current Assignee: Emerson Electric Company
• Original Assignee: Emerson Electric Company
• Inventors: Royer, Neal B.
• Primary Examiner(s): Hall, Carl E.
• Application Number:
  US07/148,074
• Time in Patent Office: 519 Days
• Field of Search: 29/596, 29/597, 310/73, 310/79, 310/90, 310/68 R, 310/71, 310/157, 362/96, 416/5
• US Class Current: 29/596
• CPC Class Codes: H02K 5/1735 radially supporting the rotary shaft at only one end of the rotor H02K5/1737 takes precedence
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132
• CPC Class Codes: H02K 7/14 Structural association with mechanical loads, e.g. with hand-held machine tools or fans with fan or impeller for cooling the machine H02K9/06
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/49011 Commutator or slip ring assembly

Abstract

A dynamoelectric machine, preferably a motor adapted for use in ceiling fan applications, has a conventional rotor assembly mounted within a bore of a stator assembly. A stationary shaft extends through the rotor assembly and provides both a cableway for electrically connecting the motor to a source of electrical energy and for permitting the attachment of additional apparatus on one end of the stationary shaft. A retainer is mounted on the stationary shaft and positions the rotor assembly with respect to the stator. The rotor assembly is attached to a hub which rotates with the rotor and provides means for attaching blades to the motor. The stator is press fit into an end shield and the resulting structure is a compact, light weight, efficient dynamoelectric machine. The end shield is provided with means for attaching a decorative enclosure about the motor, so that the asthetic appearance of the motor can be enhanced substantially. The resulting structure is relatively low weight and enables a user to install the motor, and in particular, ceiling fans more easily than prior art devices.

Claims

1. A method of constructing a dynamoelectric machine, comprising:

forming an end shield having an axial opening in it, said end shield having at least one side wall;

forming a hollow bore shaft with predetermined external and internal diameters and a first end and a second end, mounting said hollow bore shaft along the first end thereof in the axial opening of said end shield so as to retain said shaft in said opening, the second end of said shaft including means for mounting at least one additional device to said shaft, said hollow bore permitting electrification of said additional device;

machining a portion of said side wall of said end shield after mounting said shaft in said end shield to provide squareness of said machined portion with respect to said shaft;

press fitting a stator assembly for said dynamoelectric machine into said end shield along the machined portion thereof, so as to ensure squareness of said stator assembly with respect to said shaft, said stator assembly having a central bore opening in it;

forming a non-lubricated hub having an axial length and an axial opening through it, said hub having an external diameter and an internal diameter, the internal diameter of said hub along its axial opening being formed sufficiently larger than the predetermined external diameter of said shaft to define a predetermined space therebetween;

mounting at least one bearing along a portion of the axial opening of said hub in the predetermined space between the hub and shaft;

mounting a rotor for said dynamoelectric machine on said hub along the external diameter of said hub to form a rotor and hub combination; and

mounting the rotor and hub combination on said shaft so that said rotor and hub combination are supported on said shaft and rotatable with respect thereto along said bearing, said rotor and said shaft being positioned along the bore opening of said stator assembly; and

attaching a decorative enclosure to said end shield.

3. The method of claim 1 wherein said end shield has a raceway formed in it, said raceway communicating with the axial opening in said end shield, including the step of drawing wire through said raceway.

4. The method of claim 3 wherein said shaft has a threaded end, including the step of attaching another device to said shaft.

5. The method of claim 4 further including the step of connecting said second device to a source of electrical energy through said shaft.

2. A method of constructing a dynamoelectric machine so as to permit the components of the dynamoelectric machine to be suspended from a single end shield to facilitate mounting the dynamoelectric machine to a ceiling or the like, comprising the steps of:

forming an end shield having an axial opening in it, said end shield having at least one side wall;

mounting a hollow bore shaft in the axial opening of said end shield in a stationary position, said hollow bore shaft being fixed in the opening of said end shield;

machining a portion of the side wall of said end shield after mounting said shaft in said end shield to ensure squareness of said side wall with respect to said shaft;

press fitting a stator assembly for said dynamoelectric machine into said end shield along the machined portion thereof so that said stator assembly is supported by said end shield and square with respect to said shaft, said stator assembly having a central bore opening formed in it, said bore opening passing said shaft;

forming a non-lubricated hub having an axial length and an axial opening through it, said hub having an external diameter and an internal diameter, the internal diameter of said hub along its axial opening being formed sufficiently larger than the predetermined external diameter of said shaft to define a predetermined space therebetween;

mounting at least one bearing along a portion of the axial opening of said hub in the predetermined space between the hub and shaft;

mounting a rotor for said dynamoelectric machine on said hub along the external diameter of said hub to form a rotor and hub combination; and

mounting the rotor and hub combination on said shaft so that said rotor and hub combination is supported by said shaft and rotatable with respect to it along said bearing.