| 摘要 |
PROBLEM TO BE SOLVED: To achieve the increase of the price competitiveness by the reduction in the quantity of input of rare earth magnet powder into a motor by the multilayering of a magnet, the higher permeance which can enhance the resistance to demagnetization due to reverse fields under exposure at a high temperature of 100-120°C, and the transformation into sine waves of gap magnetic flux density for silencing and higher precision in positional control. SOLUTION: A multilayer structure magnet rotor gives rotational direction magnetizing components to between at least the magnetic poles of the magnet rotor. To be concrete, in the multilayer structure magnet rotor, the rate of the rotational direction magnetizing components to the thickness of a magnet is made 30% or over, preferably, 50% or over. In addition, the rate of the rotational direction magnetizing components between magnetic poles in the perpendicular direction of a magnet is changed regularly in the rotational direction, according to the number of magnetic poles. It is to be desired that this rotor should be constituted of a multilayer structure of anisotropic rare earth bond magnet consisting of Sm<SB>2</SB>Fe<SB>17</SB>N<SB>3</SB>rare earth fine particulates and Nd<SB>2</SB>Fe<SB>14</SB>B rare earth particulates where the maximum energy product (BH)<SB>max</SB>in its rotational direction and radial direction are 140 kJ/m<SP>3</SP>or over. COPYRIGHT: (C)2007,JPO&INPIT
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