JPH0819202A - Insulator for synchronous motor - Google Patents

Abstract

PURPOSE:To increase an electrical insulation distance and prevent the winding operation of a stator winding from being deteriorated improving an insulator in the stator of a synchronous motor. CONSTITUTION:In the stator 12 of a synchronous motor, an insulator 26 for electrically insulating a stator winding 20 contained in a slot 14 for a winding from the stator core 12a of a magnetic circuit element has an insulating main part 30 covering a winding slot 14 alternately formed with a stator tooth 18 in the inner circumferential surface of a stator core 12a and an insulating auxiliary part taking the form of a sharp rising wall toward the inside of the winding slot 14 from an opening 16. The electrical insulation distance from the winding 20 to the tooth end 18a of a stator tooth 18 can be set to a proper value without deteriorating the winding operation of the stator winding 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structural improvement of a stator in a synchronous motor such as a synchronous servo motor, and more particularly to a stator tooth on a cylindrical peripheral surface which is radially opposed to the outer periphery of a rotor with a gap. Between the stator winding loaded in the winding groove of the stator and the hook portion facing the opening of the winding groove in the same stator tooth from the circumferential direction (hereinafter referred to as the tooth end of the stator tooth). The present invention relates to an insulator structure improved so that an electrical insulation distance can be set to a sufficient length that can be adapted to an insulation performance adapted to a usage condition of a motor user, for example.

[0002]

2. Description of the Related Art A synchronous motor, in particular, a synchronous servo motor is provided with a stator on the outer circumference of a rotor with a gap interposed therebetween.
The stator has a structure in which stators and stator winding grooves are alternately provided on the inner peripheral surface facing the rotor, and the stator winding grooves have multi-phase stator windings loaded from the stator inner peripheral surface side. It is well known. An example of the structure of the stator in such a synchronous servo motor is shown in FIG.
As is clear from the cross section of FIG. 7, the stator includes stator teeth 41 formed on the inner peripheral surface of a stator core 40 mainly composed of a laminated body of magnetic steel plates and two stator teeth 4
1 and 41, the stator tooth 41 has a tooth end 41a that projects in the circumferential direction toward the opening 42a of the winding groove 42. Then, inside the winding groove 42, the stator winding 43 is loaded from the opening 42a side.
Is provided, and an insulator 44 that is inserted along the inner peripheral wall of the winding groove 42 is provided.

In such a stator structure, when the number of windings of the stator winding 43 wound around the stator groove 42 is relatively small, the electric power reaching the tooth end 41a of the stator tooth 41 from the stator winding 43 is reduced. A relatively long insulating distance can be secured. On the other hand, in synchronous servo motors, small high output motors are required as a recent trend,
As shown in FIGS. 8 and 9, the winding groove 4 of the stator core 40
The number of windings of the stator windings 43 loaded in 2 increases to increase the density.

[0004]

When the winding density in the winding groove of the stator is increased in accordance with the downsizing and higher output of such a synchronous servomotor, a part of the stator winding 43 is partially removed. The winding groove 42 is provided near the opening 42a, and the length of the tooth end 41a of the stator tooth 41 becomes shorter as the size is reduced. As a result, the stator winding 4
3 and the tooth end 41a of the stator tooth 41 gradually decrease, and a case where a sufficient insulation length cannot be secured occurs. As shown in FIGS. 8 to 9, the insulator 44 is attached to the stator tooth 41. Even if the structure is extended to the tooth end 41a side, the electric insulation distance length required by the usage conditions of the motor user cannot be sufficiently secured.

Therefore, the present invention is to provide an improved insulator structure in order to solve the problems in the conventional synchronous motor stator.

[0006]

In view of the above-mentioned problems, the present invention provides a structure of an insulator used in a stator of a synchronous motor, in which a winding groove formed alternately with stator teeth on an inner peripheral surface of a stator core. On the other hand, an insulating auxiliary portion having the shape of a partition wall is extended from the opening of the winding groove toward the inner depth of the winding groove, and the stator winding can be easily loaded without impairing the convenience of the stator winding. The desired electrical insulation distance can be secured by setting the electrical insulation distance from the winding wire to the tooth ends of the stator teeth by setting the extension length of the partition wall-shaped insulation auxiliary portion to an appropriate value. Is.

That is, according to the present invention, the winding groove of the stator in the synchronous motor, which comprises the rotor and the stator having stator teeth on the inner peripheral surface of the cylinder facing the outer periphery of the rotor with a gap In the insulator to be loaded, the insulator is integrally formed with the insulating main part surrounding the inside of the winding groove of the stator, and is extended as a partition wall in the winding groove. Provided is an insulator for a synchronous motor, which is provided with at least an insulating auxiliary portion that extends an insulating distance between a winding mounted in a winding groove and a tooth end of the stator tooth over a required length. To be done.

The insulator is preferably formed by molding using a resin material (for example, polyester resin) in advance as a predetermined insulator unit having the insulating main portion and the insulating auxiliary portion, and the stator winding. Is inserted into the winding groove before being wound into the winding groove. At this time, it is preferable that the insulator unit is designed and formed in advance as an annular insulator unit according to the size of the stator, the number of winding grooves, the shape, and the like.

Further preferably, the insulator is formed by forming a pair of two insulator units each having the above-mentioned insulation main portion and insulation auxiliary portion, and inserted into the winding groove from both end surface sides of the stator. Therefore, the two insulators in the winding groove of the stator overlap each other in the axial direction of the stator, so that a break in the electrically insulating region is prevented.

[0010]

In the insulator of the synchronous motor having the above-mentioned structure, the insulation auxiliary portion integrally formed with the insulation main portion serves to wrap the stator winding wound in the winding groove, so that the stator winding The insulation distance between the wire and the tooth end of the stator tooth is extended corresponding to the length of the insulation auxiliary portion in the winding groove, and the desired length can be set.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail based on the embodiments shown in the accompanying drawings. FIG. 1 is an end view of a stator showing a structure of an insulator of a synchronous servo motor according to an embodiment of the present invention, and FIG. 2 shows a structure of an insulator of a synchronous servo motor according to another embodiment of the present invention. An end view of the stator, FIGS. 3 and 4 are views 3-3 in FIG.
5 is a partial perspective view showing two units of the insulator when viewed in a direction, and FIGS. 5 (a) and 5 (b) show the two insulator units shown in FIGS. 3 and 4 in the winding groove of the stator. 6 is a schematic front view for explaining the insulator assembling process in which the two insulator units of FIG.
[Fig. 6] is a partial perspective view showing only one unit in another example of the structure of the insulator.

Referring to FIG. 1, FIG. 1 shows a schematic stator structure of the synchronous motor viewed from one end face side. The synchronous motor includes a rotor 10 as a rotating part.
A stator 12 is provided on the outer circumference of the stator 12 so as to face the rotor 10 in the radial direction with a gap A in between. This stator 12
Has a stator core 12a made of a laminated body of magnetic steel plates as a magnetic path element, and the stator core 12a has a predetermined number of winding grooves 1 determined according to the number of poles and the number of phases of the synchronous motor.
4 are provided at equal intervals in the circumferential direction, and these winding grooves 14
Each has an opening 16 in the inner peripheral surface of the stator 12, and is formed in a normal groove shape for housing a winding wire that expands in a fan shape from the opening 16 toward the inner side in the radial direction.

Then, the stator core 12 of the stator 12
In the a, stator teeth 18 are alternately arranged in the circumferential direction with the winding grooves 14.
Are formed in the radial direction, and the inner ends of the stator teeth 18 face the outer circumference of the rotor 10. The inner end of each of these stator teeth 18 has an opening 1 of the winding groove 14 on both sides.
6 protrudes in the circumferential direction toward the opening 6 and faces the opening 16 to form tooth ends (hook ends) 18a of the stator teeth. The stator winding 20 is wound inside the winding groove 14 after the insulator 26 according to the present invention, which will be described later, is attached. Although not shown in the drawing, the stator winding 20
Extends to another winding groove, for example, adjacently to the winding groove 14 while straddling each stator tooth 18, and forms the stator 12 of the multi-phase synchronous motor.

Referring now to FIGS. 3 and 4, one embodiment of the insulator 26 is the stator core 12 of FIG.
3A is a three-dimensional perspective view taken along the line 3-3 of FIG. 3A, and the insulator 26 includes an insulator unit 28a and an insulator unit 28b shown in FIG. Each of the insulator units 28a and 28b of the insulator 26 includes the stator 12 (stator core 12
According to the number of winding grooves provided in a), it is preferable from the viewpoint of manufacturing cost that it is molded from an insulating material, for example, a resin material such as a polyester material, by a molding method using a molding die. It is preferable that it can be manufactured at a low price, and it is formed as a cylindrical body part by being extended in the circumferential direction shown by the two-dot chain line in FIGS. Then, both insulator units 28a and 28b are connected to the stator core 12
It is fitted in the winding groove 14 from the outside of the end faces of both ends in the direction of the central axis of the a in a fitting manner. Arrows A and B in FIGS. 3 and 4 indicate the insertion direction.

Here, the insulator unit 28a,
28b is an insulating main portion 30 for insulatingly surrounding the stator winding with respect to the stator core 12a inside the winding groove 14.
At least an insulating auxiliary portion 31 extending in a partition wall shape in the radial direction from the central axis toward the inner depth of the winding groove 14 is provided, and more preferably, the stator winding is provided inside the winding groove 14 in the radial direction. An arc-shaped inner winding support portion 32 that prevents the wire 20 from protruding and interfering with the outer circumference of the rotor 10, and an outer winding support portion that supports the stator winding 20 outside the winding groove 14 in the radial direction. 33. The insulation main portion 30 and the insulation auxiliary portion 31 are circumferentially coupled by the outer winding support portion 33 and the coating portion 34 that coats the stator teeth 18 to obtain the cylindrical body structure as described above. .

In the one insulator unit 28b shown in FIG. 4, a reduced portion 31a is formed at the inner end portion (upper end side in the figure) of the insulating auxiliary portion 31 in the axial direction, and such reduced portion 31a is an insulator. When the insulation auxiliary portion 31 of the unit 28a and the winding groove 14 are met, the insulation auxiliary portion 31 overlaps the inside of the latter insulation auxiliary portion 31 to form a cut of electrical insulation.

FIG. 5A shows a state immediately after the start of insertion when the insulator units 28a and 28b are inserted from both end faces of the stator core 12a into the winding groove 14 along the stator axial direction. That is, both insulator units 28a and 28b are still in a state before they meet each other inside the winding groove 14. In FIG. 5B, both the insulator units 28a and 28b are completely inserted into the winding groove 14 from both end surfaces of the stator core 12a, and after both meet inside the winding groove 14, the reduced portion 31a is further removed. Shows the state in which the wire is fitted and overlapped with the tip of the mating insulation auxiliary portion 31, and the inside of the winding groove 14 is completely formed in the insulating region.

Here, referring again to FIG. 1, since the insulator 26 including the pair of insulator units 28a and 28b is provided with the partition wall-shaped insulating auxiliary portion 31 inside each winding groove 14, the stator 26 Winding 30
As for the electrical insulation distance between each of the tooth ends 18a of the stator teeth 18, a desired insulation distance length is obtained according to the length of the partition wall-shaped insulation auxiliary portion 31 facing inward. .

Moreover, since these insulating auxiliary portions 31 extend from the openings 16 of the winding grooves 14 toward the inner side in the radial direction, they do not close the openings 16.
Therefore, when the stator winding 30 is wound, there is an advantage that it does not hinder the winding work. Therefore, by adopting such an insulator 26, a sufficient insulation distance can be ensured even in a synchronous motor of a small size and high output type, so that a high insulation breakdown performance is required from the usage conditions of the motor user. In such a case, it is possible to sufficiently deal with such cases and to obtain high reliability in motor performance.

FIG. 2 shows another embodiment of the insulator of the synchronous motor according to the present invention. In the embodiment, the insulation auxiliary portion 31 of each of the pair of insulator units forming the insulator 26 is further provided with: A second insulating auxiliary portion 35 that covers the end surface of each tooth end 18a of the stator tooth 18 is provided, and the electrical insulation distance between the stator winding 20 and the tooth end 18a of the stator tooth 18 is increased. Have a configuration.

Also in this embodiment, since the second insulating auxiliary portion 35 merely covers the tooth ends 18a of the stator teeth 18, the winding of the stator winding 20 is prevented from the winding groove 14. When performing through the opening 16, its workability is not impaired. Although FIG. 6 shows only one insulator unit of the insulator 26 according to another embodiment, this insulator unit 29a is shown.
Then, the structure is simplified by omitting the inner winding support portion 32 in the insulator units 28a and 28b shown in FIGS. 3 and 4 described above, and the stator winding 20 is protruded from the inner peripheral surface of the stator core 12a. In the case where the winding density is low, it is possible to use the insulator 26 having such a simple structure.

In the above-described embodiments, the insulator 26 is formed as a molded part made of an insulating resin material. However, another insulating material, for example, a folding method of a paper material is used. It goes without saying that various modifications and changes can be made, such as the embodiment formed by In addition, the above-described embodiment is illustrated and described as an insulator applied to the winding groove that opens from the inner peripheral surface to the inner rear in the stator of the synchronous motor, but the electrical insulation according to the technical idea of the present invention is described. It goes without saying that the structure of the insulator that increases the distance can be applied to other types of wire wound motors.

[0023]

As described above, the present invention has been described based on various embodiments. According to the present invention, however, in a stator of a synchronous motor, in particular, a synchronous servo motor, a stator housed in a winding groove is provided. As an insulator structure that electrically insulates the winding from the stator core of the magnetic path element, a winding groove formed alternately with the stator teeth on the inner peripheral surface of the stator core is wound from the opening of the winding groove. An electrical insulation distance extending from the stator winding to the tooth ends of the stator teeth without impairing the winding work of the stator winding by extending the insulation auxiliary part having the shape of a partition wall toward the inner depth of the wire groove. By setting the extension length of the insulation auxiliary portion of the partition wall to an appropriate value, a desired electrical insulation distance can be secured, and as a result, sufficient electrical insulation can be obtained as desired. A distance can be secured, which leads to a compact size An effect that it is possible to provide a force motor.

[Brief description of drawings]

FIG. 1 is an end view of a stator showing a configuration of an insulator of a synchronous servo motor according to an embodiment of the present invention.

FIG. 2 is an end view of a stator showing a structure of an insulator of a synchronous servo motor according to another embodiment of the present invention.

FIG. 3 is a partial perspective view showing one of the two units of the insulator when viewed in the direction of arrow 3-3 in FIG.

FIG. 4 is a partial perspective view showing the other unit of the two units of the insulator when viewed in the direction of arrow 3-3 in FIG.

5 (a) and (b) are two insulator units shown in FIG. 3 and FIG. 4 inserted in the winding groove of the stator from the respective end surfaces of the stator.
It is a schematic explanatory drawing explaining the insulator assembling process which makes it the state which overlaps inside a winding groove.

FIG. 6 is a partial perspective view showing only a unit on one side in another structural example of the insulator.

FIG. 7 is an end view illustrating an example of a structure of a conventional insulator.

FIG. 8 is an end view showing a structural example of an insulator in a conventional small high-power synchronous servomotor.

FIG. 9 is an end view showing another structural example of an insulator in a conventional small high-power synchronous servomotor.

[Explanation of symbols]

 10 ... Rotor 12 ... Stator 12a ... Stator core 14 ... Winding groove 16 ... Opening 18 ... Stator tooth 18a ... Tooth end 20 ... Stator winding 26 ... Insulator 28a ... Insulator unit 28b ... Insulator unit 30 ... Insulation main part 31 ... Insulation auxiliary Part 31a ... Reduction part 34 ... Cover part

Claims (1)

[Claims] 1. An insulator loaded in a winding groove of a stator in a synchronous motor, comprising: a rotor; and a stator having stator teeth on a cylindrical inner peripheral surface facing the outer periphery of the rotor with a gap, The insulator is mounted in the winding groove by being integrally formed with the insulating main portion surrounding the inside of the winding groove of the stator and extending as a partition wall in the winding groove. An insulator for a synchronous motor, comprising at least an insulating auxiliary portion for extending an insulation distance between a wound winding and a tooth end of the stator tooth over a required length.