Electrical motor construction

• US 3,919,572 A
• Filed: 12/26/1973
• Issued: 11/11/1975
• Est. Priority Date: 12/26/1973
• Status: Expired due to Term

• Current Assignee: Comair Rotron Incorporated (Gentherm Incorporated)
• Original Assignee: Jacques J. Desy
• Inventors: Desy, Jacques J.
• Primary Examiner(s): Skudy, R.
• Application Number:
  US05/428,081
• Time in Patent Office: 685 Days
• Field of Search: 310/4MM,270,271,260,67,43,85,89,91,45,42 117/128A 29/596,597 336/205
• US Class Current: 310/45
• CPC Class Codes: H02K 1/187 to inner stators
• CPC Class Codes: H02K 3/38 around winding heads, equalising connectors, or connections thereto
• CPC Class Codes: H02K 3/50 Fastening of winding heads, equalising connectors, or connections thereto
• CPC Class Codes: H02K 5/1675 radially supporting the rotary shaft at only one end of the rotor H02K5/1677 takes precedence

Abstract

A construction for the rotor or stator of an electrical motor is described. An annular leaf spring is retained on an axially extending central arbor by a flange at one end of the arbor. A mounting structure containing an insulator is next placed on the arbor and pushed against the spring. Then the stator or rotor assembly, which consists of an insulated stack of magnetic laminations carrying resin impregnated but uncured conductor windings, is mounted on the arbor. Finally, an insulated cap with a plurality of locking tabs is pressed over an indentation in the other end of the central arbor. The insulator in the mounting structure and the insulated cap are formed in the general shape of the end turns, and the smooth outlines of these insulators force the end turns into a predetermined shape as the end cap is snapped onto the arbor. Once assembled the unit is temperature cycled to cure the resin of the windings.

Claims

1. An electrical motor having a rotor element and a stator element, at least one of said elements comprising:

a central arbor with a flange at one end and an annular detent groove at the other end;

a leaf spring mounted on said arbor and located against the flange;

a motor mounting structure located on said arbor next to said leaf spring, said mounting structure having an annular recess concentric with the axis of said central arbor;

an insulating means for the annular recess of said mounting structure, said insulating means having a smooth predetermined shape;

a motor element winding assembly located on said central arbor with one of its winding end turns in contact with said insulating means; and

an insulating annular end cap mounted on said central arbor, the inner edge of said end cap having at least one tab which mates with the annular detent groove in said central arbor and holds the parts of the motor element together, the surface of said end cap facing the other of the winding end turns of said motor element having a smooth predetermined shape, thereby allowing the smooth surfaces of said insulating means and said end cap to hold the winding end turns of said motor element in a predetermined shape when the tab of the end cap is engaged in the annular detent groove of the central arbor.

2. An electrical motor as claimed in claim 1, in which the motor is a miniature motor.

3. An electrical motor as claimed in claim 1, in which said motor element winding assembly comprises a stack of annular metal laminations having a plurality of Peripheral grooves;

and a conductor wound about said stack of laminations in the grooves, thus creating winding end turns at both ends of said stack of laminations.

4. An electrical motor as claimed in claim 3, with said conductor windings being impregnated with an uncured resin.

5. An electrical motor as claimed in claim 4, in which said resin is a styrenated polyester resin of medium viscosity, catalyzed with 1.0 to 1.5 percent tertiary butyl perbenzoate.

6. An electrical motor as claimed in claim 4 in which said resin is curable at room temperature.

7. In an electric motor construction, means for securing a motor element to a mounting structure, said motor element having a set of winding end turns formed on each end of a cylindrical laminated magnetic member, comprising:

a preformed insulating means adapted to envelop a set of said end turns;

a preformed insulating member adapted to envelop the other set of said end turns; and

a cylindrical arbor adapted to pass axially through said mounting structure, said insulating means, said motor element and said insulating member in the order named, said arbor having flange means at one end for engaging said mounting structure and detaining means at the other end for engaging said insulating member to hold the parts of said securing means in assembled relationship.

8. The electric motor construction according to claim 7 wherein said mounting structure is made of insulating material and said preformed insulating means is an annular groove in said mounting structure adapted to envelop the set of said end turns.

9. The electric motor construction according to claim 7 wherein said mounting structure is made of conducting material and said preformed insulating means is a preformed annular insulating member adapted to envelop the set of said end turns.

10. In the electric motor construction according to claim 7 said securing means further comprising spring means between said mounting structure and said flange means on said arbor for maintaining said assembly under a substantially constant load condition.

11. The securing means in an electric motor construction according to claim 10, wherein the detaining means of said arbor comprises an annular groove and said insulating member includes at least one locking tab for engaging said annular groove to resist relative axial displacement therebetween.