Magnetic Member, Rotor and Motor
AssigneeDaikin Industries, Ltd.
InventorKiyotaka Nishijima
Life of this patent
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Abstract
In the present invention, since gaps respectively provided at one ends of a field magnet through-hole respectively extend toward the other ends passing on the side of a periphery with respect to the field magnet through-hole, the radial dimension of the magnetic member in this portion can be made smaller than the center of magnetic poles, so that the difference in thickness of the magnetic member in the radial direction between the border of magnetic poles and the magnetic poles can be reduced. Accordingly, the asymmetry of the configuration of a rotor is not absolutely necessary, and the outer surface does not need to be depressed for reducing the torque ripple.
Claims14
A magnetic member comprising:
- a periphery;
- a plurality of field magnet through-holes disposed annularly in a circumferential direction, each having a pair of ends in the circumferential direction;
- and
- a pair of gaps provided at said pair of ends, wherein
- said gap provided at one of said ends of one of said field magnet through-holes:
- (i) extends toward the other one of said ends passing on the side of said periphery with respect to the field magnet through-hole;
- (ii) has a first portion spaced from said periphery at a constant first distance in the circumferential direction from the side of said other one of said ends and a second portion whose distance from said periphery gradually increases while extending from said first portion toward another one of said field magnet through-holes adjacent on the side of said one of said ends;
- and
- (iii) further has a third portion provided between said second portion and said one of said field magnet through-holes.
Dependencies are inferred from the claim text.