JP3517910B2 - Motor stator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for an electric motor used for, for example, a starter for a vehicle. 2. Description of the Related Art As a prior art, Japanese Patent Publication No. 55-7061 is known.
There is a starter for an automobile disclosed in Japanese Patent Application Publication No. JP-A-2005-115139. This starter will be described with reference to FIGS. FIG. 5 is an exploded view of the starter, 1 is a bake washer inserted into an armature shaft, 2 is a washer, 3 is an armature, 3
a is its shaft, 3b is a helical spline, 4 is a magnet switch, 5 is an overrunning clutch,
6 is a pinion, 7 is a pinion stop collar, 8 is a pinion drive lever, 9 is a drive lever set bolt, 10 is a magnet switch set screw, 11 is a drive side housing, 12 is its bearing bush, 13 is an end frame cap, 14 is A commutator side end frame, 15 is a bearing bush, 16 is a through bolt, 17 is a brush holder complete, 18 is a brush, and 19 is a brush spring. Reference numeral 20 denotes a yoke complete, which mainly includes a yoke 21, a field coil 22, a pole core 23, a pole core mounting screw 24, and the like. The structure of the yoke complete 20 will be described in detail as follows. As shown in FIG. 6, the field coil 22 generally uses a flat wire 25, and the flat wire 25 is
In the meantime, the wire is wound in a rectangular shape with paper or synthetic resin film sandwiched between the wires while insulating the wires from each other.
After temporary fixing with a tape or the like, the tape is further taped with a cotton tape 27 and impregnated with an insulating varnish or the like. In other words, each field coil 22 winds a flat wire while sandwiching insulating paper or the like in the first step, temporarily secures its end with paper tape 26 or the like in the second step, and removes the entire wound body from cotton in the third step. It is produced by taping with a tape 27 or the like, and ending the insulating varnish impregnation drying step as a fourth step,
Further, as a fifth step, a so-called R-bending step of bending the entire field coil 22 into an arc shape is performed so that the entire field coil 22 easily fits and comes into close contact with the inner peripheral surface of the yoke 21.
Further, one field coil 22 and another field coil 22 are connected by welding or soldering, and the yoke 2
It was assembled in 1. However, the above-mentioned yoke complete 2
In order to fabricate 0, the process is complicated, and particularly in the field coil 22 manufacturing surface, complicated steps such as temporary fixing of a winding end and cotton tape winding are required, and all of these steps are difficult to automate and It requires a great deal of man-hours and is very expensive in combination with the large number of parts. Therefore, the following proposal is made in the above publication. That is, as shown in FIGS. 7 and 8, the field coil 22 is wound directly around the pole core 23. In this case, the coil wire is not simply wound directly, but a coil wire is coated with a plurality of insulating coatings. The magnet wire is a randomly bundled wire bundle that is freely bundled without being twisted, and this wire bundle is continuously wound around all the pole cores 23 to form the field coil 22. Thus, the property of the wire bundle, that is, the property that the cross-sectional shape of the bundle can be freely deformed, automatically causes the inside of the yoke 21 at the winding start portion to be automatically wound in the process of winding around each pole core 23. The pole core 23 is flattened along the peripheral surface, and the shaft portion of the pole core 23 is in a flat state having a longitudinal direction in the axial direction of the pole core 23 while being in close contact with the pole core 23 from the above-mentioned state. Therefore, it is possible to achieve complete automation of the manufacturing process accompanying the simplification of the field coil winding process, and reduction in size and weight due to reduction of the space occupied by the field coil. [0006] However, in the above configuration, a wire having a wire diameter of φ0.5 to φ1.2 mm is required
Since the wire bundle is a bundle of up to seven wires, if it is wound directly on a pole core, the cross-sectional area of the wire bundle is small, so that it can be applied only to a relatively low output starter. Therefore, in order to obtain a high-output starter, it is only necessary to increase the cross-sectional area of the wire bundle.For example, when a wire bundle in which the wire diameter is φ0.8 mm is simply increased to 16 wires is directly wound, When the wire bundle itself becomes thicker, a difference between the inner and outer circumferences of the wire bundle is generated, and winding is performed along the pole core, the coil strands of the wire bundle loosen from each other. Further, there is a problem that the space occupied by the field coil increases due to the loosening of the wire bundle, and the output decreases due to the increase in the entire length of the wire bundle (increase in coil resistance). As still another example, there is a method in which the number of wire bundles is set to the same eight and the coil wire is changed from φ0.8 mm to φ1.13 mm, which is twice as large in cross-sectional area. , The rigidity of the wire bundle becomes extremely strong,
The adhesion of the wire bundle to the coil strands of the wire bundle and to the pole core is reduced, and the space occupied by the field coil is increased and the output is reduced as in the above case. Further, in any case, the winding operation also has a problem that the wire bundle rigidity is significantly reduced due to the increased rigidity. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and there is no protrusion of a coil wire from a pole core, and the total length of a wire bundle is suppressed without increasing the space occupied by a field coil in the pole core. It is another object of the present invention to provide a stator for an electric motor that can obtain higher output and has good winding workability. [0009] In order to achieve the above object, the present invention provides a cylindrical yoke, and a plurality of pole cores arranged in a circumferential direction on an inner peripheral surface of the yoke. A plurality of coil strands are bundled and formed, and the inner winding wire bundle with insulating coating continuously wound directly on adjacent pole cores, and a plurality of coil strands are formed and bundled. The inner winding wire bundle is wound directly on the outer surface of the inner winding wire bundle and electrically connected in parallel to the inner winding wire bundle.
And a field coil having an outer winding wire bundle provided with an insulating coating. According to the present invention, the first wire bundle and the second wire bundle in which a plurality of coil wires are bundled are wound directly around the pole core in parallel for each bundle. Therefore, when a field coil having the same cross-sectional area is formed with only one wire bundle, when the wire bundle is wound around the pole core, the wire bundle and the pole core and between the coil strands come into close contact with each other. The wire does not protrude from the pole core, the space occupied by the field coil in the pole core does not increase, and the space occupied by the coil does not increase. Since the wire bundle is a rigid wire bundle, the winding operation can be easily performed. An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a sectional view showing a yoke complete using a field coil of a stator of an electric motor according to the present embodiment.
FIG. 2 is a plan view of the yoke complete in FIG. FIG. 3 is a configuration diagram of a stator of a motor using a field coil according to the present embodiment. The field coil 1 includes an inner winding wire bundle 1a, which is a first insulated magnet wire bundle having the same overall length in which a plurality of insulated wires are formed into a randomly assembled wire bundle, and a further insulated magnet wire bundle. It consists of a certain outer winding wire bundle 1b. The inner wire bundle 1a is directly wound around the pole core 3 welded and fixed to the inner diameter of the cylindrical yoke 2, and then the outer wire bundle 1 is wound.
b is wound directly. As shown in FIG. 4, the surface 3a of the pole core 3 and the inner surface 2a of the yoke 2 are coated with an insulator made of epoxy powder 10, and the inner wire bundle 1a and the outer wire bundle 1b, the yoke 2, and the pole core are coated. 3 is insulated. Further, the inner winding wire bundle 1a and the outer winding wire bundle 1b are welded and fixed to the yoke 2 at a winding start portion S and a winding end portion E which are shifted by the difference in the total length. The intermediate portion C is connected to the brush 5 by being welded to the connecting bar 4. Then, as shown in FIG. 4, after the inner winding wire bundle 1a and the outer winding wire bundle 1b are wound,
The inner wire bundle 1a and the outer wire bundle 1b are coated and fixed with an epoxy resin powder 10, so that the wire strands are fixed between the pole core 3 and the yoke 2 so as not to move. In addition, armature 6, magnet switch 7, starter switch 8, and DC power supply 9
There is no difference from the general configuration. Next, a description will be given of a winding method according to this embodiment having the above-described structure. As the inner wire bundle 1a and the outer wire bundle 1b, for example, a wire bundle composed of eight φ0.8 insulating wires having the same overall length is used. First, the inner wire bundle 1a
Is wound directly on the pole core 3 from the winding start portion S to the winding end portion E. Subsequently, the outer winding wire bundle 1b is shifted from the winding start portion S of the inner winding wire bundle 1a by the difference between the outer circumference of the inner winding and the inner circumference of the inner winding from the winding start portion S to the winding end portion E.
Up to the outside of the inner winding wire bundle 1a. The winding start portion S and winding end portion E of the inner winding wire bundle 1a and the outer winding wire bundle 1b are
Are directly welded to the ground side. Also, the middle part C
By connecting to the brush 5 via the connecting bar 4 to form a field coil circuit, the inner winding wire bundle 1a and the outer winding wire bundle 1b wound in parallel are connected with the same connection as one coil. Become. Therefore, a sufficient cross-sectional area as a field coil of a high-output starter can be obtained by direct winding. In this embodiment, the inner winding wire bundle 1a and the outer winding wire bundle 1b are continuously wound from the winding start portion S to the winding end portion E, but may be wound up to the intermediate portion C. . As described above, in the field coil of the stator of the electric motor according to this embodiment, the divided wire bundles can be directly wound around the pole core in parallel. Further, in the example of the field coil of the stator of the electric motor, the inner winding wire bundle 1a and the outer winding wire bundle 1b are eight insulated wires of φ0.8 mm having the same overall length, but are not limited thereto. The wire diameter and the number of wires are appropriately selected according to the output. In this embodiment, the inner winding wire bundle 1a is used.
And winding end S and winding end E of the outer winding wire bundle 1b
Are set at different positions depending on the difference in the perimeter, but the same position is obtained by making a difference in the total length of the inner winding wire bundle 1a and the outer winding wire bundle 1b by the difference in the perimeter. It can also be welded. As an improvement in welding at the same position as described above, for example, the lower winding wire bundle 1a has a diameter of φ
0.8 × 8 wires, upper wire bundle 1b is φ0.8 × 9
By increasing the cross-sectional area of the upper winding wire bundle 1a as a book, or by making the lower winding wire bundle 1a φ0.8 × 8
By increasing the wire diameter of the upper winding wire bundle 1a to 0.85 × 8 and increasing the element wire diameter of the upper winding wire bundle 1b, the resistance values of both can be made uniform. Further, the wire bundle in this embodiment is φ
While 0.8 × 8 × 2 bundles (16), for example, φ0.85 × 5 × 3 bundles (15) or φ0.8
A similar effect can be obtained even if the number of wire bundles is increased within a range where the cross-sectional areas substantially match, such as × 4 wires × 4 bundles (16 wires).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a yoke complete using a field coil of a stator of an electric motor according to the present embodiment. FIG. 2 is a plan view of the yoke complete in FIG. 1; FIG. 3 is a configuration diagram of a stator of a motor using a field coil according to the present embodiment. FIG. 4 is an explanatory view showing a state where an epoxy powder is coated. FIG. 5 is a configuration diagram showing a conventional example. FIG. 6 is an explanatory view showing a conventional field coil. FIG. 7 is a sectional view showing a conventional example. FIG. 8 is a plan view showing a conventional example. [Description of Signs] 1 ... Field coil, 1a ... Wire bundle for inner winding, 1b ... Wire bundle for outer winding, 2 ... Yoke, 3 ... Pole core, 4 ... Connecting bar .

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 3/18

Claims (1)

(57) [Claims 1] A cylindrical yoke, a plurality of pole cores arranged in a circumferential direction on an inner peripheral surface of the yoke, and a plurality of coil element wires are formed by being bundled. Inner winding wire bundle with insulating coating continuously wound around the adjacent pole core, and a plurality of coil wires are formed in a bundle and overlapped on the outer surface of the inner winding wire bundle.
Te is a direct winding electrically in parallel with respect to said winding wire bundle
The stator of the motor, characterized by comprising a field coil with a connected insulating coating External winding wire bundle.