JP2001136699A - Brushless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excellent and inexpensive brushless motor being mounted to a magnetic tape-driving device by facilitating coil winding treatment and stator installation. SOLUTION: In the brushless motor having a core 2 that has a plurality of teeth 1 in an inner-peripheral direction, a stator core 3 where a plurality of cores are laminated, coil winding 5 where the stator core 3 is held between two insulators 4 from both surfaces and the teeth 1 are wound along with the insulators 4, and a base 6 opposite to the stator core 3 in the axial direction, and a projection 7 being extended in the axial direction is provided at the outer-periphery of the insulator 4 and a teeth outer end, thus obtaining an inexpensive and excellent brushless motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless motor mounted on a magnetic tape drive or the like.

[0002]

2. Description of the Related Art In recent years, there has been a demand for a magnetic tape drive for recording / deleting / reproducing various kinds of information, and the price has been reduced with the spread of the device. Is required. At the same time, miniaturization is also demanded.

Conventionally, as a stator of such a brushless motor, one described in Japanese Patent Application Laid-Open No. Sho 62-71457 is known. FIG. 8 shows a stator structure of a conventional motor. In FIG. 8, the winding 53 is performed by using a stator 50 in which end plates 52 each having a crossover wire guide for connecting a crossover wire are overlapped on both ends of a stator core 51.
0, a spacer 55 is separately interposed between the base 54.

[0004] As a crossing wire routing means, there is known one described in Japanese Utility Model Laid-Open No. 5-67159. FIG. 9 shows the line processing structure. In FIG. 9, a thin pin-shaped crossover guide 63 is provided at the outer end of the teeth 61 for winding processing. This guide is included in the insulator 62 by integral molding.

[0005]

In the above-described stators, when a spacer is separately used for mounting the stator, the cost increases due to the increase in the number of parts and the number of mounting steps. In addition, when an integrally molded insulator is used, the production thereof requires a high level of technology, which also increases the cost. Further, in the case of a thin pin-shaped crossover wire guide, a spacer may be required due to insufficient strength at the time of attachment, or the wire may be broken due to its tension when the wire diameter of the winding becomes large.

Further, when the stator core is attached to the base via an insulator integrally molded with resin, heat generated in the winding portion is conducted through the insulator made of resin, so that heat cannot be efficiently dissipated.

An object of the present invention is to solve such a problem and to provide an inexpensive and excellent brushless motor.

[0008]

According to a first aspect of the present invention, a core having a plurality of teeth in an inner circumferential direction, a stator core having a plurality of the cores laminated, and a stator core having a plurality of cores are provided. In a stator having a pair of insulators sandwiched from both sides and winding the teeth together with the insulators, and a stator having a base axially opposed to the stator core, the stator extends in the axial direction to the outer peripheral portion of the insulators and the outer ends of the teeth. It is provided with a convex portion. Further, a hole is provided at the same position as the center of the projection and the stator core, and the stator core is attached to the base through a metal screw, a rivet, or the like in the hole.

[0009] Thereby, the crossover wire of the winding can pass through each slot while being hooked on the convex portion, and there is no need to form an integrally formed insulator including the convex portion. It can function as a spacer interposed between the stator core and the base.

Further, the heat generated by the windings is conducted from the stator core to the base via screws and rivets, so that the heat radiation effect can be enhanced.

Therefore, an excellent brushless motor can be provided at low cost.

[0012]

According to the present invention, a core having a plurality of teeth in an inner circumferential direction, a stator core in which a plurality of the cores are laminated, and the stator core are sandwiched from both sides by a set of insulators, In a winding having teeth wound together with the insulator, and a stator having a base axially opposed to the stator core,
The outer peripheral portion of the insulator and the outer end of the teeth are provided with convex portions extending in the axial direction. Further, a metal screw is provided in a hole provided at the same position as the center of the projection and the stator core,
The stator core is attached to a base through rivets or the like.

With such a structure, the crossover of the winding can pass through each slot while being hooked on the projection, and there is no need to form an integral insulator including the projection. In addition, the protrusions can be spacers interposed between the stator core and the base, and the heat generated in the winding portion is conducted from the stator core to the base via screws and rivets to enhance the heat radiation effect. An inexpensive brushless motor can be provided.

[0014]

An embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) The embodiment of the brushless motor constructed as described above will be described with reference to FIGS. 1, 2, 3 and 4. FIG. FIG. 1 is a partial sectional view showing a stator of a brushless motor according to a first embodiment of the present invention. FIG. 2 is a partial perspective view of the stator according to the first embodiment. FIG. 3 is a side sectional view of the brushless motor according to the first embodiment. FIG. 4 is a partial perspective view of the stator according to the first embodiment.

First, a core 2 having a plurality of teeth 1 in the inner circumferential direction, a stator core 3 in which a plurality of cores 2 are stacked, and a stator core 3 are sandwiched from both sides by a set of (two pieces of insulators 4 having the same shape). In a brushless motor including a winding 5 in which the teeth 1 are wound together with the insulator 4 and a base 6 axially opposed to the stator core 3, an outer peripheral portion of the insulator 4 and a convex portion 7 extending in the axial direction are provided at outer ends of the teeth. .

When moving between the teeth 1 by line processing, the teeth 1 pass through each slot while hooking a crossover using the projection 7 as a guide. Here, as shown in FIG. 4, the effect of the present invention does not change even if the convex portion 7 is arranged between the outer peripheral portion of the insulator 4 and each tooth 1.

When the stator core 3 and the base 6 are mounted via the projections 7, they are fixed by welding, an adhesive, an adhesive sheet or the like, but the effect is not changed by any mounting method.

The protrusion 7 has such a degree that it does not lose the tension of the winding 5 or the stator core 3
The material, dimensions, and shape are set to such an extent that they can withstand the mounting strength when they are mounted on the base 6 with the.

In this embodiment, the inner rotor type motor is used, but the effect is not changed even with the outer rotor type motor (not shown).

(Embodiment 2) The embodiment will be described with reference to FIGS. 5, 6, and 7. FIG. FIGS. 5, 6, and 7 are sectional views showing a stator of a brushless motor according to a second embodiment of the present invention.

The difference from the first embodiment is that a hole 8 is provided at the center of the projection 7 and at the same position as the stator core 13. Further, a metal screw 9, a rivet 10, and a burring 11 made of a metal having a high thermal conductivity are passed through the hole 8 to form the stator core 1.
3 and the base 16 are attached. At this time, there must be an insulator 14 as an insulator, that is, a convex portion 17 between the metal component and the winding 5 so that the winding does not come into contact with the metal component.

In this embodiment, the inner rotor type motor is used. However, the effect is not changed even with the outer rotor type motor (not shown).

As described above, according to the present embodiment, it is necessary to provide an integrally formed insulator that allows the crossover of the winding wire to pass through each slot while being hooked on the convex portion. And the above-mentioned convex portion can be a spacer interposed between the stator core and the base, and by conducting heat generated in the winding portion from the stator core to the base via screws, rivets, etc. The heat radiation effect can be enhanced, and an excellent brushless motor can be provided at low cost.

[0025]

As described above, according to the present invention, a core having a plurality of teeth in the inner circumferential direction, a stator core having a plurality of the cores laminated thereon, and the stator core sandwiched from both sides by two insulators having the same shape are provided. In a winding having teeth wound together with the insulator, and a stator having a base axially opposed to the stator core,
By providing a convex portion extending in the axial direction at the outer peripheral portion of the insulator, an outer end of the teeth, a crossover of the winding can pass through each slot while being hooked on the convex portion, and includes the convex portion. It is not necessary to use an expensive integrally molded insulator, and the protrusions serve as spacers interposed between the stator core and the base, so that the number of parts can be reduced. Time and cost can be reduced.

A hole was formed at the center of the projection and at the same position as the stator core, and the stator core and the base were attached via metal screws, rivets, or the like having high heat conductivity. Heat can be conducted from the stator core to the base via the screws, rivets, etc., to enhance the heat radiation effect.

Thus, an excellent brushless motor can be realized at low cost.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a stator of a brushless motor according to a first embodiment of the present invention.

FIG. 2 is a partial perspective view of a stator according to the first embodiment of the present invention.

FIG. 3 is a side sectional view of the brushless motor according to the first embodiment of the present invention.

FIG. 4 is a partial perspective view of a stator of the brushless motor according to the first embodiment of the present invention.

FIG. 5 is a partial sectional view of a stator of a brushless motor according to a second embodiment (screw fixing) of the present invention.

FIG. 6 is a partial cross-sectional view of a stator of a brushless motor according to a second embodiment (rivet setting) of the present invention.

FIG. 7 is a partial cross-sectional view of a stator of a brushless motor according to a second embodiment (burring stop) of the present invention.

FIG. 8 is a sectional view of a conventional brushless motor.

FIG. 9 is a sectional view of a conventional brushless motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 tooth 2 core 3, 13 stator core 4, 14 insulator 5 winding 6, 16 base 7, 17 convex part 8 hole 9 screw 10 rivet 11 burring

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // H02K 15/10 H02K 15/10 F term (reference) 5H002 AA07 AB05 AC02 AC03 AC04 5H019 AA00 AA09 AA10 CC03 CC04 DD01 EE01 EE06 EE14 GG00 GG01 5H604 AA05 BB01 BB14 BB15 BB17 CC01 CC05 CC16 PB03 QB14 5H615 AA01 BB01 BB04 BB14 BB16 PP01 QQ02 RR01 SS16 SS18 SS20 5H621 BB07 GA01 GA04 HH01 JK08

Claims (2)

[Claims] 1. A core having a plurality of teeth in an inner circumferential direction, a stator core in which a plurality of the cores are stacked, and the stator core sandwiched from both sides by a set of insulators,
In a brushless motor having a base wound in such a manner that the teeth are wound together with the insulator and a base opposed to the stator core in the axial direction, an outer peripheral portion of the insulator, a protruding portion extending in the axial direction provided near each tooth outer end. Passes through each slot while the winding is hooked on,
The brushless motor is characterized in that the projections serve as spacers sandwiched between the stator core and the base. 2. A core having a plurality of teeth in an inner circumferential direction, a stator core having a plurality of the cores laminated thereon, and the stator core sandwiched from both sides by a set of insulators,
In a brushless motor having a base wound in such a manner that the teeth are wound together with the insulator and a base opposed to the stator core in the axial direction, an outer peripheral portion of the insulator, a protruding portion extending in the axial direction provided near each tooth outer end. And a hole provided at the same position as the center of the projection and the stator core, and a screw, a rivet, a burring, or another member for attaching the stator core to the base is passed through and fixed to the hole.