Brushless DC motor with reduced emissions
AssigneeCooper-Standard Automotive Inc.
InventorsDavid Crowther, Jesse Whitfield
Life of this patent
Estimating the term…
Abstract
A brushless DC motor includes a stator formed of a lamstack including a plurality of stacked laminations. The stator includes a plurality of radially extending core members and a circumferential wall. An intersection of each of the plurality of radially extending core members with the circumferential wall defines a flux null location, and a portion of the lamstack defines a first opening located at one of the flux null locations. The brushless DC motor includes a printed circuit board including a second opening and a grounding member including a first section received in the first opening of the stator and a second section received in the second opening of the printed circuit board to create a grounding path.
Claims20
A brushless DC motor comprising:
- a stator formed of a lamstack including a plurality of stacked laminations, the stator including a plurality of radially extending core members and an outer circumferential wall disposed at a radially outer end of the plurality of radially extending core members, wherein an intersection of each of the plurality of radially extending core members with the circumferential wall defines a flux null location, and a portion of the lamstack defines a first opening located at at least one of the flux null locations;
- a printed circuit board including a second opening;
- and
- a grounding member that provides an electrical connection with the lamstack and the printed circuit board, the grounding member including a first section received in the first opening of the stator and a second section received in the second opening of the printed circuit board to create a grounding path that reduces emissions.
A brushless DC motor comprising:
- a stator formed of a lamstack including a plurality of stacked laminations, the stator including a plurality of radially extending core members and an outer circumferential wall disposed at a radially outer end of the plurality of radially extending core members, wherein an intersection of each of the plurality of radially extending core members with the circumferential wall defines a flux null location, a portion of the lamstack defined a first opening located at at least one of the flux null locations, an inward spoke is attached to an opposing inner end of the plurality of radially extending core members, and a stator winding passes around each of the plurality of radially extending core members;
- a rotor assembly including a rotor and a permanent annular magnet disposed within the rotor, wherein the stator includes a central aperture through which the rotor passes, and the stator windings generate opposing magnetic fields to rotate the rotor when current passes through the stator windings;
- a printed circuit board including a second opening;
- and
- a grounding member that provides an electrical connection with the lamstack and the printed circuit board, the grounding member including a first section received in the first opening of the stator and a second section received in the second opening of the printed circuit board to create a grounding path that reduces emissions.
Dependencies are inferred from the claim text.