Brushless D.C. motor
First Claim
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1. A brushless direct current motor comprising:
- a wound stator and a permanent magnet rotor, the rotor having a laminated core, said laminated core being overmolded with overmolding material magnetized subsequent to molding;
wherein the stator surrounds the rotor and has an outer ring, a plurality of angularly spaced pole pieces extending inwardly from the outer ring and a plurality of flux pieces extending inwardly from the outer ring and located between adjacent pairs of the pole pieces, the outer ring forming a plurality of slots on an inner surface thereof for slidably receiving the flux pieces after applying windings to the pole pieces;
wherein the overmolding material forms an integral ring and is magnetized to act as an encoding disk;
wherein the core of the rotor has a plurality of angularly spaced slots extending inwardly from its outer peripheral surface and the slots are filled with said material; and
wherein at least some of the laminations have a plurality of spaced apertures therein.
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Abstract
The brushless direct current motor comprises a housing 10, a stator 13 and a rotor 11 within the housing, windings on the stator, sensors for sensing the position of the rotor relative to the stator and electronic circuitry for switching the current in the windings in response to outputs from the sensors to cause the rotor to rotate relative to the stator. The sensors and at least a part of the electronic circuitry are encapsulated in an electrically insulating and fuel resistant material in a container within the housing.
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Citations
13 Claims
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1. A brushless direct current motor comprising:
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a wound stator and a permanent magnet rotor, the rotor having a laminated core, said laminated core being overmolded with overmolding material magnetized subsequent to molding; wherein the stator surrounds the rotor and has an outer ring, a plurality of angularly spaced pole pieces extending inwardly from the outer ring and a plurality of flux pieces extending inwardly from the outer ring and located between adjacent pairs of the pole pieces, the outer ring forming a plurality of slots on an inner surface thereof for slidably receiving the flux pieces after applying windings to the pole pieces; wherein the overmolding material forms an integral ring and is magnetized to act as an encoding disk; wherein the core of the rotor has a plurality of angularly spaced slots extending inwardly from its outer peripheral surface and the slots are filled with said material; and wherein at least some of the laminations have a plurality of spaced apertures therein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification