Motor stators

Abstract

The invention provides a stator. By using this technique, it is possible to wind the wire through wiring recesses on opposite sides of each magnetic tooth in the state that the wiring recesses are positioned on a straight line and not in the state that the wiring recesses are positioned on a curved line. In particular in the case of a two-pole stator having wiring recesses curved by a large curvature, it is possible to wind wires through the wiring recesses by a sufficient number of turns and with a high wiring density. a technique that enables core segments to be joined to each other accurately in positions while enabling wires to be wound by a sufficient number of turns and with a high wiring density. A stator has a stator core (10) having a plurality of core segments (13L, 13R) each including a magnetic pole tooth (11). Each of the core segments (13L, 13R) has two segment portions (13LU, 13LD; 13RU, 13RD) each including a wiring recess (11b) and a half part of the magnetic pole tooth (11). Wires (24) are wound around the core segments (13L, 13R), so that each of the wires (24) extends through and between the wiring recesses (11b) of the two segment portions (13LU, 13LD; 13RU, 13RD) of each of the core segments (13L, 13R). The two segment portions (13LU, 13LD; 13RU, 13RD) of each of the core segments (13L, 13R) are joined to each other after the wire is wound. The core segments (13L, 13R) are arranged in a substantially annular shape and joined to each other to form the stator core (10) after the two segment portions (13LU, 13LD; 13RU, 13RD) of each of the core segments (13L, 13R) are joined to each other.

Description

technical field [0001] The present invention relates to, for example, a stator of a motor built into an electric power tool as a drive source, and particularly relates to its winding structure. Background technique [0002] The following patent document discloses a technique in which a stator core having a laminated structure is divided into a plurality of separate cores for each magnetic pole tooth, and each core separate is opened toward the magnetic pole at a thin-walled hinge portion. The teeth are wound, and then at the thin-walled hinge part, the iron core splits after winding are restored to an arc shape, and finally the iron core splits are combined to obtain a circular stator. When adopting the unfolded winding stator or winding method, instead of winding the winding spaces on both sides of the magnetic pole teeth into a circular arc shape, the winding can be carried out under the state of unfolding them into a straight line, especially It can also carry out high-d...

AI Technical Summary

Problems solved by technology

[0004] However, when the above-mentioned winding structure in the prior art is adopted, since the winding is carried out at the thin-walled hinge part so that the iron core split is in the unfolded state, the winding is completed. After the line, it is restored to a curved shape at the thin-walled hinge, so there are two bending processes at the thin-walled hinge. In this way, when it is restored to a curved shape, it may not be possible to accurately restore the accuracy of the iron core split. (The unevenness of the bulging part), and sometimes the following situation occurs: in the subsequent process of combining the iron core splits, the ends of the iron core splits are misaligned and cannot be accurately combined

If the thin-walled hinge part is made thinner, the dimensional accuracy can be corrected when returning to the curved shape, but the durability of the thin-walled hinge part will be reduced.

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