Motor

Abstract

The utility model discloses a motor. The number of bulged poles of a stator is twelve, and the number of magnetic poles formed on the peripheral surface of a rotor is ten. The motor not only can form an effective magnetic circuit, but also can reduce the cogging torque. In the motor, the stator (3) disposed at the radial peripheral side of the rotor (2) comprises a stator core (13) which is provided with twelve bulged poles (13a) bulging radially inwards. The rotor (2) comprises a plurality of permanent magnets (8) which are arranged in the peripheral direction in an adjacent manner, and are arranged opposite to tail end faces (13e) of the bulged poles (13a), wherein there are gaps between the permanent magnets (8) and the tail end faces (13e) of the bulged poles (13a). The number of the magnetic poles on the peripheral surface of the rotor (2) is ten. The tail end faces (13e) of the bulged poles (13a) form a concave curved surface through smooth connection surfaces, and surfaces (8b), opposite to the tail end faces (13e) of the bulged poles (13a), of the permanent magnets (8), form a convex curved surface. In the motor, the ratio R1 / R2 of the radius R1 of an imaginary circle contacting with a part of surfaces (8b) of the permanent magnets (8) to the curvature radius R2 of each of the surfaces (8b) of the permanent magnets (8) is from 0.4 to 0.55.

Description

technical field [0001] The present invention relates to a motor including a rotor and a stator arranged radially outside the rotor. Background technique [0002] Conventionally, a permanent magnet type motor including a rotor having permanent magnets and a stator disposed radially outside the rotor is known (for example, see Patent Document 1). In the motor described in Patent Document 1, the stator includes a stator core having nine salient poles protruding radially inward, and a driving coil, and the driving coil is wound around the salient poles. Furthermore, the rotor has a rotating shaft and six permanent magnets fixed to the outer peripheral surface of the rotating shaft. Six permanent magnets are fixed to the outer peripheral surface of the rotating shaft so as to be adjacent to each other in the circumferential direction of the rotor, and the number of magnetic poles formed on the outer peripheral surface of the rotor by the six permanent magnets is six poles. The ...

AI Technical Summary

Problems solved by technology

However, in this motor, since the auxiliary grooves are formed on the end faces of the salient poles, the facing area between the end faces of the salient poles and the permanent magnets is reduced by an amount equivalent to the auxiliary grooves, so it is difficult to make the lines of magnetic force flow on the end faces of the salient poles. effectively pass

That is, in this motor, it is difficult to form an effective magnetic circuit

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