Brushless motor
First Claim
1. A brushless motor comprising:
- a rotor including a magnet and rotatably supported by a rotary shaft, said magnet having magnetic poles to the number of p arranged at equal intervals on an outer circumference; and
a stator stationarily mounted to surround an outside of said rotor, said stator including slots to the number of n arranged at equal intervals in an inner circumference,wherein the ratio n/p of n to p is set between 1.2 and 1.5, andsaid rotor is supported so that it is movable in an axial direction within a movement amount of not greater than 2 mm.
1 Assignment
0 Petitions
Accused Products
Abstract
A rotary shaft of a rotor including a magnet with a plurality of magnetic poles arranged at equal intervals on an outer circumference is supported at both ends by bearings. By externally fitting the inner ring of one bearing to the rotary shaft and holding it to be immovable in an axial direction and loosely fitting the outer ring of the bearing into the support hole and positioning it with belleville springs which are in contact resiliently with both sides, the rotary shaft and the rotor are supported so that they are movable in an axial direction within a movement amount of not greater than 2 mm according to a movement of the bearing caused against spring forces of the belleville springs.
22 Citations
4 Claims
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1. A brushless motor comprising:
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a rotor including a magnet and rotatably supported by a rotary shaft, said magnet having magnetic poles to the number of p arranged at equal intervals on an outer circumference; and a stator stationarily mounted to surround an outside of said rotor, said stator including slots to the number of n arranged at equal intervals in an inner circumference, wherein the ratio n/p of n to p is set between 1.2 and 1.5, and said rotor is supported so that it is movable in an axial direction within a movement amount of not greater than 2 mm. - View Dependent Claims (2, 3, 4)
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Specification