Ac motor

Abstract

The motor includes a rotor including N-pole magnets and S-pole magnets located alternately along a circumferential direction of said AC motor, a stator core including a plurality of partial cores arranged coaxially along an axial direction of said AC motor each of said partial cores including a plurality of stator poles located along said circumferential direction so as to be on the same circumference, and a plurality of loop-like windings each of which extends in said circumferential direction while passing through, in said axial direction, interpole spaces between each two adjacent stator poles in said circumferential direction. The a phase angle difference between each adjacent two of said stator poles in said circumferential direction of the same one of said partial cores is set at a value smaller than 360 degrees for each of said partial cores.

Description

technical field [0001] The present invention relates to an AC motor, in particular to an AC motor with a structure in which the magnetic poles of the stator are positioned along the axial direction of the AC motor. Background technique [0002] Figure 25-27 There is shown a concentrated winding motor disclosed in Japanese Patent Application Laid-Open Publication No. 6-261513 (Patent Document 1), which has a coil in which each phase coil is concentratedly wound on a corresponding stator pole. structure. Figure 25 is a schematic axial sectional view of the motor, Figure 26 is a schematic circular cross-sectional view of the motor, Figure 27 is a schematic diagram of the circumferential development of the stator of the motor. [0003] The conventional concentrated winding motor disclosed in Patent Document 1 has a problem that the structure is complicated because each winding must be wound around each stator pole. In addition, since the winding must be located at the bo...

AI Technical Summary

Problems solved by technology

[0010] However, the AC motor disclosed in Patent Document 2 has a problem that since magnetic flux flows three-dimensionally in the motor, it is difficult to form its magnetic core by laminating electrical steel sheets because the magnetic anisotropy of the magnetic core

Although, powder cores (powder cores) are known as magnetic cores without magnetic anisotropy, they are expensive and inferior in magnetic properties and strength to cores formed by laminating electrical steel sheets (electrical steel sheets)

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