JP3564630B2 - Motor stator - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motor stator.
[0002]
[Prior art]
FIG. 4 is a plan view of a stator of a conventional electric motor disclosed in, for example, JP-A-63-257440. In the figure, reference numeral 100 denotes a stator core having a plurality of teeth 101. 103 is an insulating member provided on the surface of the teeth 101, 105a and 105b are windings wound over a plurality of the teeth 101, and the windings 105a are arranged near the root of the teeth 101 (inside). 105b is arranged near the tip of tooth 101 (outside).
[0003]
[Problems to be solved by the invention]
Since the stator of the conventional electric motor is configured as described above, there is a problem that the outer circumference of the winding 105b is longer than that of the inner winding 105a.
Further, since the windings are arranged inside and outside, the diameter of the stator becomes large, so that the weight of the stator becomes heavy and the cost becomes high.
[0004]
The present invention has been made in order to solve such a problem, and an object of the present invention is to obtain a compact stator of an electric motor that can shorten the circumference of a winding.
[0005]
[Means for Solving the Problems]
The stator of the electric motor according to the present invention straddles a plurality of teeth, and the stator of the electric motor in which the first-wound and the second-wound coils are wound.
The straight line connecting the set of teeth tip corners around which the winding is wound and the position of the bottom surface of the slot between the straddled teeth are substantially the same. It is the most wrapped around teeth.
[0006]
Also, an inclined portion is provided at the bottom of the slot so that the straight line does not protrude from the bottom surface toward the slot.
[0007]
Further, the inclined portion is formed by processing an insulating member provided in the slot.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a plan view of a stator of an electric motor according to Embodiment 1 of the present invention.
In the figure, reference numeral 1 denotes a stator core, in which a plurality of teeth 3 to 10 are radially provided, and each of the teeth has an umbrella-shaped tooth tip 3a to 10a. Corner portions 3b to 10b are formed at the connection portions between the straight portions of the teeth and the tip portions 3a to 10a of the teeth 3 to 10.
In addition, an insulating member 13 formed along the outer shape of the stator core 1 is provided in a portion of the stator where the winding is wound.
[0009]
The example of this embodiment is an example in which the winding is wound by skipping one tooth, and the winding 15 is wound by skipping the tooth 3 between the teeth 10 and the teeth 4 as shown in FIG. Slots 51 and 53 are formed between the skipped tooth 3 and the teeth 10 and 4 on both sides thereof, and outer corner portions of the two teeth 10 and 4 around which the winding 15 is wound (here, corners). The corner portion is a corner portion of the insulating member 13, but is expressed as a tooth corner portion for the sake of clarity of description.) The straight line A-A connecting the corner portions substantially overlaps the bottom surfaces of the slots 51 and 53. Has become.
[0010]
When the winding 15 is wound between the teeth 10 and the teeth 4 in the stator having the above-described configuration, the outer peripheral surface of the winding 15 coincides with the straight line AA as shown in FIG. Therefore, the winding 15 does not protrude toward the slots 51 and 53. Therefore, when the winding 17 (indicated by a dashed line in the figure) is wound next, there is no winding in the slot 53 into which the winding 17 is to be inserted. 4, 6 can be wound on the most root side. The same applies to other windings.
In this way, all the windings can be wound on the root side of the teeth, so that the circumferential lengths of all the windings can be kept short and the whole stator can be made compact.
[0011]
Embodiment 2 FIG.
FIG. 2 is a plan view of a stator of an electric motor according to Embodiment 2 of the present invention, and the same parts as those in Embodiment 1 are denoted by the same reference numerals.
In the second embodiment, the shape of the bottom of the slot formed between the teeth is inclined from both sides toward the center, so that the position of the straight line AA coincides with the position of the bottom of the slot. This prevents the winding from projecting toward the slot from the bottom of the slot.
By doing so, the winding 19 (shown by a dashed line in the figure) wound next to the winding 15 can abut the bottom of the slot 53 without being obstructed by the winding 15. Therefore, the winding 19 can be wound firmly and orderly, and as a result, the circumference of the winding can be shortened.
[0012]
Embodiment 3 FIG.
FIG. 3 is a plan view of a stator of an electric motor according to Embodiment 3 of the present invention, and the same parts as those in Embodiment 1 are denoted by the same reference numerals.
In the third embodiment, the shape of the stator core 1 is the same as that of the first embodiment. However, by changing the shape of the insulating member 13, the straight line A-A and the bottom surface of the slot are formed similarly to the second embodiment. The positions are matched so that the winding does not project toward the slot from the bottom of the slot.
According to this embodiment, it is only necessary to change the shape of the insulating member 13, and there is an effect that manufacturing is simple.
[0013]
【The invention's effect】
Since the present invention is configured as described above, it has the following effects.
[0014]
The straight line connecting the set of teeth tip corners around which the winding is wound and the position of the bottom surface of the slot between the straddled teeth are substantially the same. By winding the teeth around the root of the teeth, each winding can be wound around the root of the teeth without having the previously wound winding project to the slot where the teeth are wound later. The length can be shortened, and the shape of the stator itself can be made compact.
[0015]
In addition, by providing an inclined portion at the bottom of the slot so that the straight line connecting the tip corners of the teeth does not protrude from the bottom of the slot toward the slot, the winding can be wound tightly and as a result, the winding Can be shortened.
[0016]
Furthermore, since the inclined portion is formed by processing the insulating member provided in the slot, the inclined portion can be formed without changing the shape of the stator itself, and thus the manufacturing is simple.
[Brief description of the drawings]
FIG. 1 is a plan view of a first embodiment of the present invention.
FIG. 2 is a plan view of Embodiment 2 of the present invention.
FIG. 3 is a plan view of a third embodiment of the present invention.
FIG. 4 is a plan view of a stator of a conventional electric motor.
[Explanation of symbols]
1 Stator core, 3 to 10 teeth, 3b to 10b Stator core tip corner, 13 insulating member, 15, 17 winding, 51, 53 slot.

Claims (3)

In a stator of an electric motor in which first and second winding coils are wound over a plurality of teeth,
The straight line connecting the set of teeth tip corners around which the winding is wound and the position of the bottom surface of the slot between the straddled teeth are substantially the same. An electric motor stator characterized by being wound around the root of a tooth . 2. The stator according to claim 1, wherein an inclined portion is provided at a bottom of the slot so that the straight line does not protrude from the bottom surface toward the slot. 3. The stator according to claim 2, wherein the inclined portion is formed by processing an insulating member provided in the slot.

Images