Skewed rotor assembly

• US 5,144,182 A
• Filed: 09/04/1991
• Issued: 09/01/1992
• Est. Priority Date: 09/04/1991
• Status: Expired due to Term

• Current Assignee: Cummins PowerGen IP, Inc. (Cummins Incorporated)
• Original Assignee: ONAN Corporation (Cummins Incorporated)
• Inventors: Lemmer, Jerome J., Evenson, Rickie A., O'Malley, Gary B.
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): HASZKO, DENNIS
• Application Number:
  US07/754,631
• Time in Patent Office: 363 Days
• Field of Search: 310/42, 310/43, 310/61, 310/65, 310/91, 310/194, 310/215, 310/217, 310/218, 310/234, 310/235, 310/236, 310/261, 310/270
• US Class Current: 310/216.116
• CPC Class Codes: H01R 39/08 Slip-rings
• CPC Class Codes: H01R 43/10 Manufacture of slip-rings
• CPC Class Codes: H02K 1/24 Rotor cores with salient poles ; Variable reluctance rotors
• CPC Class Codes: H02K 13/02 Connections between slip-rings and windings
• CPC Class Codes: H02K 2201/06 Magnetic cores, or permanent magnets characterised by their skew
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 3/527 applicable to rotors only

Abstract

A dynamo assembly comprising a stator assembly and rotor assembly as shown. The preferred rotor assembly comprises two end caps, a single wire strand, a collector ring assembly and a plurality of laminants. The two end caps are preferably identical to one another, and oriented with the wire wrapped in two coils therearound. The laminants are supported between the two and caps, in a skewed manner. An advantageous arrangement for engagement between the collector ring assembly and wire held on the end caps is provided. A unique method of molding the collector ring assembly without internal inserts is also disclosed.

Claims

1. A rotor assembly comprising:

(a) first and second end caps;

each of said end caps having a head portion and a pair of legs;

each end cap leg having at least one skewed wall panel oriented to accept a skewed stack of laminates;

(b) a skewed stack of laminates positioned between said first and second end cap head portions;

each laminate of said skewed stack of laminates having an edge portion aligned with a skewed wall panel of said end cap legs; and

,

(c) a wire strand wrapped in first and second coils around said first and second end caps.

2. A rotor assembly according to claim 1 wherein:

(a) said first and second end caps are substantially identical to one another.

3. A rotor assembly according to claim 1 wherein:

(a) each of said legs of said first and second end caps has an outer panel, an inner panel, and a central panel;

said outer, inner and central panels of each leg defining a longitudinal channel extending between said first and second end cap head portions; and

,

(b) said first and second coils extend through said longitudinal channels defined by said outer, inner and central panels.

4. A rotor assembly according to claim 3 wherein:

(a) said outer panel of each leg is skewed from a plane; and

,

(b) said central panel of each leg is skewed from a plane.

5. A rotor assembly according to claim 1 wherein:

(a) each of said end cap head portions has an outer surface and an inner surface;

(i) said pair of legs of each end cap projecting from said end cap inner surface;

(ii) said end cap outer surface having a surface rib arrangement thereon;

(b) said first and second wire coils being positioned in extension over said surface rib arrangement of each end cap;

said surface rib arrangement generating an air flow space between each wire coil and each end cap outer surface.

6. A rotor assembly according to claim 5 wherein:

(a) each surface rib arrangement comprises six surface ribs oriented with three ribs positioned to receive said first coil thereover and three ribs positioned to receive said second coil thereover.

7. A rotor assembly according to claim 1 wherein:

(a) each of said end cap head portions has an outer surface and an inner surface;

(i) said pair of legs of each end cap projecting from said end cap inner surface;

(ii) each end cap outer surface having four corner panels extending therefrom in first and second aligned pairs;

said corner panels defining first and second coil channels extending on and across each end cap outer surface; and

(b) each of said first and second coils extends through an associated one of said first and second coil channels on said end cap outer surface.

8. A rotor assembly according to claim 7 including:

(a) a central mounting cone extending from each end cap outer surface;

(i) each of said first and second coil channels being defined generally between a pair of said corner panels and said central mounting cone.

9. An assembly according to claim 8 including:

(a) a pair of central gussets on said end cap outer surface, one of said gussets being associated with each coil channel to further define same.

10. A rotor assembly according to claim 7 wherein:

(a) each of said four corner panels has a rounded outer corner.

11. A rotor assembly according to claim 1 wherein:

(a) each of said end cap head portions has an outer surface and an inner surface;

(i) said pair of legs of each end cap projecting from said end cap inner surface;

(ii) at least one of said end cap outer surfaces includes first and second wire terminal blocks thereon;

each of said first and second wire terminal blocks having a longitudinal wire bite therein for receipt of a wire end portion; and

(b) said wire strand has first and second end portions;

said wire strand first end portion being positioned within said longitudinal wire bite of said first wire terminal block; and

, said wire strand second end portion being positioned within said longitudinal wire bite of said second wire terminal block;

(c) said rotor assembly includes a collector ring assembly in direct electrically conductive communication with each of said wire end portions by contact with portions thereof received within said longitudinal wire bites.

12. A rotor assembly according to claim 11 wherein:

(a) said end caps define a rotor central axis of rotation;

(b) each wire terminal block has a pin bore therein oriented generally coplanar with, and extending generally parallel to, said rotor central axis of rotation;

said each pin bore extending in communication with the wire bite in the same wire terminal block; and

,

(c) said collector ring includes first and second conductor pins;

(i) said first conductor pin extending into a pin bore in said first wire terminal block, and into electrically conductive engagement with a wire and portion extending therethrough; and

,

(ii) said second conductor pin extensive into a pin bore in said second wire terminal block, and into electrically conductive engagement with a wire end portion extending therethrough.

13. A rotor assembly according to claim 11 wherein:

(a) each of said conductor pins has a central longitudinal axis and is positioned with said axis extending generally orthogonal to the one of said wire end portions engaged thereby.

14. A rotor assembly according to claim 13 wherein:

(a) each of said conductor pins has an outer surface with a plurality of longitudinal splines thereon; and

,

(b) each conductor pin is oriented with at least one of its splines cut into the associated ones of said wire end portions, to provide electrical communication therebetween.

15. A rotor assembly according to claim 14 wherein each pin has at least four splines which cut into the wire end portion associated therewith.

16. A rotor assembly according to claim 12 wherein:

(a) the longitudinal wire bite of each wire terminal block has a lower shelf therein;

said lower shelf terminating in said pin bore and defining a wire support lip within said pin bore;

(b) the wire end portion in each wire terminal block is pressed against the wire support lip therein, by one of the conductor pins of said collector ring.

17. A rotor assembly according to claim 1 wherein each of said end caps comprises a single, integral, molded construction.