JP2001161043A - Stator and rotor of dynamoelectric machine for vacuum and method fop manufacturing thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a dynamoelectric machine for a vacuum, which has high insulation reliability and is easy to manufacture. SOLUTION: First and second yokes 13 and 17 of a claw-pole type yoke unit 11 have respective pluralities of teeth 15 and 19. An annular excitation winding 21 is placed in an annular space between the first and second yokes 13 and 17. A ceramic wire, which is a winding conductor covered with a ceramic insulation covering material flexible before baking, is wound into an annular shape and then baked to form the excitation winding 21. The annular winding 21 is housed in a ceramic bobbin 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator and a rotor for a rotary electric machine for vacuum and a method for manufacturing the same.

[0002]

2. Description of the Related Art Japanese Utility Model Registration No. 2530114 discloses an example of the structure of a stator and a rotor of a vacuum pulse motor (rotary electric machine). When manufacturing a stator for a conventional rotary electric machine for vacuum, before firing, a ceramic electric wire whose winding conductor is covered with a ceramic insulating coating material having flexibility is wound around the salient pole portion of the stator core, and then fired. To form the winding. The rotor is
A permanent magnet having a Curie point that withstands a heat treatment temperature (baking treatment temperature) performed for use in a vacuum is used.

[0003]

The ceramic covering material of the ceramic electric wire is flexible even before firing.
If the curvature is large, molding is not easy, and if it is forcibly curved, cracks may be formed after firing. Even after firing, the reliability of insulation is not always high. Further, the rotor has a structure in which a permanent magnet is joined to the outer peripheral portion of the yoke using an adhesive, but it is difficult to obtain a sufficient adhesive strength with an inorganic adhesive.

An object of the present invention is to provide a stator for a vacuum rotary electric machine which has high insulation reliability and is easy to manufacture, and a method for manufacturing the same.

Another object of the present invention is to provide a highly reliable vacuum rotary electric machine rotor and a method of manufacturing the same.

[0006]

According to the present invention, a stator for a vacuum rotary electric machine according to the present invention, which is used in a vacuum environment and in which a rotor rotates, has n pole teeth arranged at a predetermined pitch in a circumferential direction of a rotating shaft. The first and second yokes provided and an annular winding disposed in an annular space formed between the first and second yokes; and n pole teeth of the first yoke; Second
The two or more claw-pole-type yoke units configured by combining the first and second yokes such that the n pole teeth of the yoke are arranged in a non-contact meshing state are arranged in the axial direction of the rotation shaft. It has the structure arranged so that it may line up. The rotating electric machine includes a rotating position sensor such as a resolver in addition to a motor and a generator. As the annular winding, a coil formed by winding a ceramic electric wire covered with a winding conductor with a flexible ceramic insulating covering material before firing and firing it after forming an annular shape is used. If you adopt an annular winding,
Since the annular winding can be formed without reducing the curvature or the radius of curvature of the ceramic electric wire, it is easy to form the winding using the ceramic electric wire, and the productivity is greatly improved.
In particular, when the annular winding is entirely covered with the covering portion made of ceramic, the fired annular winding can be protected and the insulation can be improved.
Further, there is an advantage that the amount of gas emitted from the annular winding covered by the covering portion is reduced, and the baking process can be shortened. The coating made of ceramic can be formed, for example, by spraying a ceramic material onto the outer surface of the annular winding by plasma spraying. In this case, the coating can be easily formed.

In the case of manufacturing the stator of the rotary electric machine for vacuum, before firing, a ceramic electric wire covered with a flexible ceramic insulating coating material is wound in an annular shape and then fired to form an annular winding. make. Then, the annular winding is entirely covered with a covering portion made of ceramic. Further, a first electrode having n pole teeth arranged at a predetermined pitch in the circumferential direction is provided.
And the second yoke are combined so that an annular winding is interposed therebetween and the n pole teeth of the first yoke and the n pole teeth of the second yoke are in a non-contact meshing state. Make a claw pole type yoke unit. After that, two or more claw-pole type yoke units are arranged side by side in the axial direction of the rotor while being shifted by a predetermined pitch in the circumferential direction of the rotor, and then subjected to baking processing. Here, the baking process is
This is a known processing operation for performing a heat treatment to increase the ultimate vacuum when used in a vacuum.

In the case where the above-mentioned ceramic coating portion is not provided, before firing, a ceramic electric wire covered with a flexible ceramic insulating coating material is annularly wound around a ceramic bobbin and then fired. To form an annular winding.

The present invention is also directed to a vacuum rotary electric machine rotor having a structure in which a plurality of permanent magnets are fixed to the outer peripheral portion of a back yoke fixed to the rotary shaft so as to be arranged in the circumferential direction of the rotary shaft. And In this rotor, a permanent magnet made of a magnet material having a Curie point equal to or higher than the baking temperature is used as the permanent magnet. The outer surfaces of the plurality of permanent magnets fixed to the back yoke are entirely covered with a coating made of ceramic. This coating portion can also be formed by spraying a ceramic material on the outer surfaces of the plurality of permanent magnets fixed to the back yoke by plasma spraying. This not only increases the fixing strength of the permanent magnet to the yoke, but also protects the permanent magnet with the ceramic coating, and further removes gas from the adhesive used for fixing the permanent magnet from the ceramic coating. Can be sealed.

In manufacturing this rotor, a plurality of permanent magnets made of a magnet material having a Curie point higher than the baking temperature are fixed on the outer periphery of the back yoke. Thereafter, a ceramic material is sprayed on the outer surfaces of the plurality of permanent magnets fixed to the back yoke by plasma spraying to form a coating portion. Then, a baking process is performed thereafter.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an exploded view of a typical two-phase permanent magnet type stepping motor for vacuum application to which a stator and a rotor of a vacuum rotary electric machine according to the present invention are applied. FIG. 2 is a diagram showing the relationship between the pole teeth of the stator and the magnetic poles of the rotor. In FIG. 1, reference numeral 1 denotes a rotor having a permanent magnet element 7 fixed to a back yoke 5 made of a magnetic material fixed to a rotating shaft 3. The rotating shaft 3 is supported by two bearings (not shown). These bearings are Utility Model Registration No. 2530
A rolling bearing having a solid surface treatment described in No. 114 or a rolling bearing using ceramic is used. The permanent magnet element 7 is configured such that n (n is a positive integer of 4 or more) N magnetic poles and n S magnetic poles alternately appear at the same pitch in the circumferential direction of the rotating shaft. ing. In this permanent magnet element 7, n permanent magnets 8 (N poles appear on the outer surface in FIG. 1) are fitted in n grooves formed at equal intervals on the outer periphery of the back yoke 5. And is fixed using an inorganic material-based adhesive.
In the portion between the n grooves formed at equal intervals on the outer periphery of the back yoke 5, the magnetic poles excited by the magnetic fluxes emitted from the n permanent magnets 8 cause the S pole to appear on the surface. It should be noted that such an excitation structure is disclosed in Japanese Patent Publication No. 7-50654 and is well-known, and therefore the description thereof is omitted.

In the rotor 1, as the plurality of permanent magnets 8, permanent magnets made of a magnet material having a Curie point higher than a baking temperature are used. As such a permanent magnet, a samarium-cobalt magnet having a Curie point of 800 degrees or more can be used. In this example, FIG.
As shown in FIG. 1, the outer surface of the main part of the rotor including the plurality of permanent magnets 8 fixed to the back yoke 5 is entirely covered with a coating 6 made of ceramic. In FIG. 1, the main part of the portion covered by the covering portion 6 is hatched. The coating 6 is formed by spraying a ceramic material by plasma spraying on the outer peripheral surface of the rotor including the outer surfaces of the plurality of permanent magnets 8 fixed to the back yoke 5. By doing so, not only the fixing strength of the permanent magnet 8 to the yoke 5 is increased, but also the permanent magnet 8 can be protected by the ceramic coating portion. It can be sealed with a ceramic coating 6.

The stator 9 fixed to a housing (not shown) and disposed on the outer peripheral side of the rotor 1 includes first and second claw-pole type yoke units 11 and 25. First and second claw-pole type yoke units 11
And 25 are arranged side by side in the axial direction of the rotating shaft 3. First and second claw-pole type yoke units 11
And 25 are displaced in the circumferential direction by １ ／ pitch of the magnetic pole pitch P of the permanent magnet element 7. The first claw-pole type yoke unit 11 is opposed to the permanent magnet element 7 at a predetermined radial distance and has n pole teeth 15... And 19 arranged at a predetermined pitch P in the circumferential direction.
, And the first and second yokes 13 and 17 respectively.
And an annular exciting winding 21 for exciting the n pole teeth 15 of the first yoke 13 and the n pole teeth 19 of the second yoke 17 to different polarities. The annular exciting winding 21 is wound around a ceramic bobbin 23. The second claw-pole-type yoke unit 25 also includes n pole teeth 29... And 33... Which face the permanent magnet element 7 at a predetermined interval in the radial direction and are arranged at a predetermined pitch P in the circumferential direction. , The first and second yokes 27 and 31, the n pole teeth 29 of the first yoke 27, and the second
And a ring-shaped exciting winding 35 for exciting the n pole teeth 33 of the yoke 31 to different polarities. The annular exciting winding 35 is also wound around a bobbin 37 made of ceramic.

The ring-shaped exciting windings 21 and 35 are formed by winding a ceramic electric wire covered with a flexible ceramic insulating covering material with a flexible ceramic insulating coating material before firing and then firing. Is used. Since the structure of the ceramic electric wire is known as shown in FIG. 1B of Japanese Utility Model Application Laid-Open No. 4-5262, its details are omitted. An example of the configuration of the draw-out portions of the annular exciting windings 21 and 35 and the baking conditions are described in detail in Utility Model Registration No. 2530114, and thus the details are omitted.

If such annular exciting windings 21 and 35 are employed, the winding can be formed without increasing the curvature or the radius of curvature of the ceramic electric wire. And productivity is greatly improved.

As shown in FIG. 2, in a typical permanent magnet type stepping motor, a pitch P between two pole teeth 15,
The pitch P between the two pole teeth 17, the pitch P between the two pole teeth 29, the pitch P between the two pole teeth 33, and the pitch P between the two magnetic poles of the permanent magnet element 7 are all the same pitch (angle). It is.

Next, a second embodiment of the present invention will be described. FIG. 4 is a schematic perspective view of the annular exciting winding 121 used in this embodiment. The annular excitation winding 121 used in this example can be used in place of the annular excitation winding 21 (35) used in the embodiment of FIG. If used, there is no need to use the ceramic bobbins 23 and 37 used in the embodiment of FIG. Therefore, the annular exciting winding 121 is disposed in an annular space between the first and second yokes 13 and 17 (or 29 and 31). FIG.
As the annular winding portion of the annular exciting winding 12 shown in FIG.
Before firing, a ceramic wire covered with a flexible ceramic insulating covering material and covered with a winding conductor is wound into a ring shape and then fired. In particular, in this example, the annular winding is covered by a covering portion 120 made entirely of ceramic. Therefore, not only can the annular winding after firing be protected, but also the insulation can be improved. Further, there is an advantage that the amount of gas emitted from the annular winding covered by the covering portion 120 is reduced, and the baking process can be shortened. The coating portion 12 made of ceramic
0 can be formed, for example, by spraying a ceramic material onto the outer surface of the annular winding by plasma spraying. In this case, the coating portion 120 can be easily formed. Further, it is not necessary to use a ceramic bobbin.

In the case of manufacturing the stator of the rotary electric machine for vacuum, before firing, a ceramic electric wire whose winding conductor is covered with a ceramic insulating coating material having flexibility is wound in an annular shape and then fired. Make an annular winding. Then, the annular winding is entirely covered with a covering portion 120 made of ceramic. Further, the first and second yokes each having n pole teeth arranged at a predetermined pitch in the circumferential direction are sandwiched between an annular winding between the first and second yokes, and the n pole teeth of the first yoke and the second York n
A claw-pole type yoke unit is made by combining the pole teeth so as to be in a non-contact meshing state. After that, two or more claw-pole type yoke units are arranged side by side in the axial direction of the rotor while being shifted by a predetermined pitch in the circumferential direction of the rotor, and then subjected to baking processing.

In the above-described embodiment, the present invention is applied to a two-phase permanent magnet type stepping motor for vacuum. However, the present invention can naturally be applied to a stator and a rotor of another rotary electric machine for vacuum. .

[0020]

According to the present invention, by adopting an annular winding, the winding can be formed without reducing the bending rate or radius of curvature of the ceramic electric wire. And the productivity is greatly improved. In particular, when the annular winding is entirely covered with a covering portion made of ceramic, the fired annular winding can be protected and the insulation can be improved. Further, there is an advantage that the amount of gas emitted from the annular winding covered by the covering portion is reduced, and the baking process can be shortened.

Further, when the rotor of the present invention is used, when the outer surfaces of the plurality of permanent magnets fixed to the back yoke are entirely covered with a coating made of ceramic, the fixing strength of the permanent magnets to the yoke is increased. In addition, there is an advantage that the permanent magnet can be protected by the ceramic coating, and furthermore, the gas emitted from the adhesive used for fixing the permanent magnet can be sealed by the ceramic coating.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state in which a rotor is arranged at the center of a two-phase permanent magnet type stepping motor for vacuum according to an embodiment of the present invention in a state where a stator is cut open and deployed.

FIG. 2 is a diagram showing the relationship between the pole teeth of the stator of FIG. 1 and the magnetic poles of the rotor.

FIG. 3 is a sectional view of a rotor of the vacuum rotary electric machine of the present invention used in the embodiment of FIG. 1;

FIG. 4 is a schematic perspective view of an annular winding used in a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor 3 Rotation axis 7 Permanent magnet element 9 Stator 11, 25 Claw pole type yoke unit 13, 17 Yoke 15, 19, 29, 33 Polar teeth 21, 35 Excitation winding

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 37/14 535 H02K 37/14 535K 535X F-term (Reference) 5H002 AA07 AE02 5H604 AA08 BB02 BB14 CC01 CC05 CC19 DA01 PB01 PB04 PE06 5H615 AA01 BB08 BB14 PP02 PP12 QQ02 QQ19 RR01 SS18 SS24 SS34 TT05 TT21 5H622 CA02 CA10 CB01 DD02 PP03 PP19 QA08

Claims (7)

[Claims] 1. A stator for a vacuum rotary electric machine which is used in a vacuum environment and in which a rotor rotates inside, wherein each of the stators includes n pole teeth arranged at a predetermined pitch in a circumferential direction of the rotating shaft. And a second yoke, and an annular winding disposed in an annular space formed between the first and second yokes, wherein the n pole teeth of the first yoke and The two or more claw-pole-type yoke units, which are configured by combining the first and second yokes so that the n pole teeth of the second yoke are arranged in a non-contact meshing state, The annular winding is arranged so as to be aligned in the axial direction of the rotating shaft, and before firing, after the ceramic electric wire covered with the winding conductor by the ceramic insulating coating material having flexibility before being fired is annularly wound. It is formed by firing, and the annular winding is A stator for a rotary electric machine for a vacuum, wherein the stator is entirely covered by a coating portion made of ceramic. 2. The stator according to claim 1, wherein the coating portion made of ceramic is formed by spraying a ceramic material onto an outer surface of the annular winding by plasma spraying. 3. A method for manufacturing a stator for a vacuum rotary electric machine which is used in a vacuum environment and in which a rotor rotates, wherein a ceramic electric wire covered with a ceramic insulating coating material having flexibility before firing is provided. After being wound in an annular shape, it is fired to form an annular winding, and the annular winding is entirely covered with a coating portion made of ceramic, and each has n pole teeth arranged at a predetermined pitch in a circumferential direction. Non-contact engagement between the n pole teeth of the first yoke and the n pole teeth of the second yoke sandwiching the annular winding between first and second yokes. A claw-pole-type yoke unit is made by combining them so as to be in a state, and two or more of the claw-pole-type yoke units are arranged side by side in the axial direction of the rotor while being shifted by a predetermined pitch in the circumferential direction of the rotor. The stator manufacturing method of a vacuum electric rotating machine, characterized in that applying a grayed process. 4. A stator of a vacuum rotary electric machine which is used in a vacuum environment and in which a rotor rotates inside, the stator including n pole teeth arranged at a predetermined pitch in a circumferential direction of a rotating shaft of the rotor. A first winding, a first winding, a second winding, and an annular winding disposed in an annular space formed between the first and second yokes, wherein the n pole teeth of the first yoke are provided. And at least two claw-pole-type yoke units configured by combining the first and second yokes such that the first and second yokes are arranged in a non-contact meshing state with the n pole teeth of the second yoke. The annular winding is arranged in the axial direction of the rotating shaft, and the ceramic wire covered with a flexible ceramic insulating coating material before firing is annularly wound around a ceramic bobbin. After firing. Vacuum rotary electric machine stator according to claim. 5. A vacuum rotating electric machine rotor having a structure in which a plurality of permanent magnets are fixed to an outer peripheral portion of a back yoke fixed to a rotating shaft so as to be arranged in a circumferential direction of the rotating shaft, As the permanent magnet, a permanent magnet made of a magnet material having a Curie point equal to or higher than the baking temperature is used, and the outer surfaces of the plurality of permanent magnets fixed to the back yoke are entirely covered with a coating portion made of ceramic. A rotor for a rotary electric machine for vacuum characterized by the fact that the rotor is used. 6. The rotary electric machine according to claim 5, wherein the coating portion is formed by spraying a ceramic material by plasma spraying on outer surfaces of the plurality of permanent magnets fixed to the back yoke. Rotor. 7. A method of manufacturing a rotor for a vacuum rotary electric machine having a structure in which a plurality of permanent magnets are fixed to an outer peripheral portion of a back yoke fixed to a rotating shaft so as to be arranged in a circumferential direction of the rotating shaft. Fixing the plurality of permanent magnets made of a magnet material having a Curie point equal to or higher than the baking temperature on an outer peripheral portion of a back yoke, and forming a ceramic on an outer surface of the plurality of permanent magnets fixed to the back yoke. A method for manufacturing a rotor for a vacuum rotary electric machine, comprising spraying a material by plasma spraying to form a coating portion, and thereafter performing baking treatment.