Motor stator heat spike

• US 5,051,634 A
• Filed: 06/29/1989
• Issued: 09/24/1991
• Est. Priority Date: 06/29/1989
• Status: Expired due to Term

• Current Assignee: Kollmorgen Corporation (Regal Rexnord Corp.)
• Original Assignee: Kollmorgen Corporation (Regal Rexnord Corp.)
• Inventors: Overton, Bernard P.
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): Rebsch, D. L.
• Application Number:
  US07/373,387
• Time in Patent Office: 817 Days
• Field of Search: 310/64, 310/65, 310/186, 310/208, 310/216, 310/217, 310/218, 310/254
• US Class Current: 310/64
• CPC Class Codes: H02K 1/165 Shape, form or location of the slots
• CPC Class Codes: H02K 9/223 Heat bridges

Abstract

An electric motor includes a heat spike within the stator slots which extends radially inward from the stator back iron into the slot between the stator teeth. The heat spike, placed within the stator slots, reduces the heat path length and increases the heat transfer areas to the iron. Together, these allow the winding heat to dissipate quicker, and thereby, reduce the hotspot temperature and improve the motor'"'"'s load rating.

Claims

1. An electric motor comprising:

a stator being a stationary wound member;

a rotor being a movable field member, the magnetic field of said rotor interacting with energized windings of said stator, causing said rotor to move relative to said stator;

a plurality of stator slots, each stator slot having one elongated solid heat spike of thermal conductive material said heat spikes each extended radially inward from the stator adjacent to said windings to at least the midpoint of the stator slot area, each heat spike substantially centered around the midpoint of slot arc along the stator shell, such that said heat spikes are widest when farther away from said rotor and said heat spikes are narrowest when closer to said rotor; and

support means for maintaining an air gap between said stator and said rotor.

2. An electric motor comprising:

a stator having windings and a plurality of stator slots;

a rotor;

a plurality of elongated solid heat spikes of thermal conductive material for increasing the horsepower of said motor by 5% or more, each of said stator slots having one of said heat spikes of thermal conductive material, said heat spikes each extended radially inward from the stator to at least the midpoint of the stator slot area said heat spikes adjacent to said stator windings, each heat spike substantially centered around the midpoint of slot arc along the stator shell such that said heat spikes are widest when farther away from said rotor and said heat spikes are narrowest when closer to said rotor; and

support means for maintaining an air gap between said stator and said rotor.

3. In an electric motor having a stator and a rotor a method of heat reduction of at least 50% in the stator winding hot spot temperature comprising the steps of:

providing a plurality of stator slots in said stator;

providing a plurality of elongated solid heat spikes of thermal conductive material within said stator slots, said heat spikes in thermal contact with stator windings such that said heat spikes are widest when farther away from said rotor and narrowest when closer to said rotor;

extending each of said heat spikes radially inward from the midpoint of slot arc along the stator shell into each of said stator slots to at least the midpoint of the stator slot area; and

maintaining an air gap between said stator and said rotor by providing support means.