TH74160B - Permanent magnet motor - Google Patents

Abstract

DC60 (February 25, 2010) is a project to invent a permanent magnet motor that can reduce the torque of the motor gears and reduce torque from motor vibration when braking or reducing the motor's driving power. The permanent magnet motor 1 consists of a rotor 3, which has many permanent magnets 5 arranged in a ring shape. A magnetic field is emitted from each magnet. When a cross-section of the permanent magnets 5 is taken, it can be seen that they consist of an inner edge 51 created from the first arc with its center of curvature at O-micron 1 and radius R1; an outer edge 52 created from a second arc 521 with its center of curvature at O-micron 2 and radius R2; a third arc 522 with its center of curvature at O-micron 3 and radius R3, connected to one end of the second arc 521; and a fourth arc 523 with its center at O-micron 4 and radius R4, connected to the other end of the second arc 521. The centers of curvature as described above are positioned in different locations.

Claims (3)

------11/06/2561------(OCR) Page 1 of 2 pages. Claims. 1. A permanent magnet motor consists of: a stator with a stator core and coils wound on it; and a rotor with numerous permanent magnets arranged in an annular shape. The stator core has an annular yoke and radial extensions from the yoke where the diagonal cross-section of the permanent magnets has an inner edge composed of the first arc with center of curvature O1 and radius of curvature R1, and an outer edge composed of the second arc with center of curvature O2 and radius of curvature R2, the third arc with center of curvature O3 and radius of curvature R3 connecting one end of the second arc, and the fourth arc with center of curvature O4 and radius of curvature R4 connecting the other end of the second arc. When the centerline of the second arc is A, one end of this arc is C, and the other end is C', the center of curvature O2 is located on segment AO1, which connects center of curvature O1 to centerline A; the center of curvature O3 is located on segment CO2, which connects center of curvature O2 to one end C of the second arc; and the center of curvature O4 is located on segment C'O2, which connects center of curvature O2 to the other end C' of the second arc; and the radii of curvature R2, R3, and R4 and the length of segment AO1 are denoted by Formula 1 as follows: AO1 > R2 > R3 = R4 (Formula 1). 2. Permanent magnet motors. According to claim 1, the ratio of the radius of curvature R2 to the length of the segment AO1 is represented by formula 2 as follows: 0.63 (symbol)(R2/AO1)(symbol)0.8 (formula 2). Page 2 of 2. 3. Permanent magnet motors. According to claim 2, the ratio of the radius of curvature R3 to the radius of curvature R2 can be written as Formula 3: 0.56 (symbol)(R3/R2)(symbol)0.81 (Formula 3) ------------