CZ309600B6 - Electric motor and producing it - Google Patents

Abstract

The electric motor (1) includes a rotor (2) rotating around the axis (4a) of rotation, split iron cores (6) containing a rear yoke (9), and a tooth extending from the rear yoke (9) towards the rotor (2), insulating a belt (8) attached to each of several split iron cores (6) and an insulator (7) attached to an end surface of each of the of cores (6), each end surface is substantially perpendicular to the axis (4a) of rotation of the rotor (2) ). Each insulator (7) has a tooth cover (14) to cover the end face of the tooth, an inner wall (13) and an outer wall (12) and a holder (15, 16) for holding the insulating strip (8) and the coil (18). The retaining part (15, 16) is a retaining tooth on the end surface of at least one outer wall (12) or inner wall (13) in their circumferential direction and protrudes in the circumferential direction. The invention also relates to a method of manufacturing an electric motor (1).

Description

Electric motor and method of its production

Field of technology

The invention relates to an electric motor having a stator arranged by winding a coil directly around the teeth of the stator iron cores.

The invention also relates to a method of manufacturing an electric motor.

Current state of the art

A series electric motor, such as a brushless DC motor, has often been used for a rotary electric motor, such as an induction motor.

A plurality of teeth are arranged at equal intervals around the inner surface of the electric motor stator, with an insulating material placed on each of the teeth. The coil is wound directly around each insulating material.

The structure for the insulating stator iron cores and coils includes a structure for covering the entire peripheral surfaces of the respective teeth and grooves for winding the coil at the respective rear yokes with an insulator which is an insulating member formed of resin, and a structure for covering the entire peripheral surfaces of the respective teeth and grooves for winding the coil at the respective rear yokes through a combination of an insulator, which is an insulating member made of resin, and a foil-shaped insulating strip (see, for example, JP-A-2008-061 443 (pages 5 to 18, Fig. 5)).

Recently, the demands for miniaturization and higher performance in rotary electric motors, such as induction motors, have been increasing.

One approach to contribute to miniaturization and higher performance is to replace the insulating material, formed as a thick resin part, with a thin foil-shaped insulating strip to increase the volume of the coil, thereby increasing the effective areas of the grooves around which the coil is wound, thereby increasing the number of coil turns.

The method includes covering the teeth arranged on the inner surfaces of the respective grooves of the stator iron cores and the back yokes with an insulating strip in the form of a foil, and covering both axial end surfaces of the respective stator iron cores with the respective insulators of the insulating member made of resin.

A projection which is directed deep into the inside of each of the stator iron cores, and which is formed of resin in the shape of a tooth, is arranged near each end of the individual insulator.

Each end of the foil-shaped insulating strip is held by each of the tooth-shaped protrusions, thereby preventing the occurrence of positional displacement of the foil-shaped insulating strip during coil winding.

However, there is an increase in the thickness of the insulating material where there is an overlap between the two insulating materials, particularly the insulating material of the tooth-shaped projection and the insulating foil-shaped strip, so that the effective areas of the grooves along which the coil is wound are reduced accordingly.

This creates the problem of the impossibility of achieving a sufficient effect during miniaturization and ensuring higher performance.

- 1 CZ 309600 B6

In addition, tooth-shaped protrusions formed from resin are located within the groove along which the coil is to be wound.

Direct contact between the lugs and the coil can therefore occur, with the coil rubbing against the corner of the lug, resulting in damage to the insulating cover film. The reliability of the insulation can thus be further impaired.

The essence of the invention

The object of the present invention is therefore to develop an electric motor exhibiting high insulation reliability and providing high power by increasing the effective areas of the grooves along which the coil is to be wound.

Another task of this invention is to develop a method of manufacturing an electric motor, exhibiting high operational efficiency.

According to one aspect of the present invention, an electric motor has been developed comprising:

a rotor rotatable about an axis of rotation, a plurality of split iron cores which are arranged in an annular pattern to surround the rotor, each of the plurality of split iron cores comprising:

a back yoke, and a tooth extending from the back yoke toward the rotor, an insulating strip attached to each of the plurality of split iron cores, an insulator attached to an end surface of each of the plurality of split iron cores, each end surface being substantially perpendicular to the axis of rotation rotor, each insulator comprising:

a tooth cover for covering the tooth end surface of one of the plurality of split iron cores, an inner wall arranged on the inner peripheral side of the tooth cover, an outer wall arranged on the outer peripheral side of the tooth cover and attached to the rear yoke end face, and a holding part for holding the insulating strip on the end portion in the circumferential direction of the split iron core of at least one outer wall or inner wall, and a coil wound around each of the plurality of split iron cores with at least one tooth cover and an insulating strip therebetween.

The retaining part is a retaining tooth which is arranged on the end surface of at least one outer wall or inner wall in their circumferential direction and protrudes in the circumferential direction.

The width of the split iron core in its circumferential direction is preferably greater than the width of the insulator in its circumferential direction.

- 2 CZ 309600 B6

The free space of the tooth, having a recessed shape or a cut-out shape, is preferably arranged at the foot of the holding tooth on the outer wall or the inner wall of each insulator, and the holding tooth of each insulator is preferably placed in the free space of the tooth of the adjacent insulator.

The back yoke of at least one of the plurality of split iron cores is advantageously joined together by means of a connecting portion arranged at the end of the rear yoke of another one of the plurality of split iron cores, which adjoins at least one of the plurality of split iron cores.

The connecting part is preferably a bent thin-walled part which is formed integrally with the adjacent split iron core.

The connecting part can preferably be a connecting part that is rotatable.

According to another aspect of this invention, a method of manufacturing an electric motor has also been developed, comprising:

a rotor rotatable about an axis of rotation, a plurality of split iron cores arranged in an annular pattern so as to surround the rotor, each of the plurality of split iron cores comprising:

a back yoke, and a tooth extending from the back yoke toward the rotor, an insulating strip attached to each of the plurality of split iron cores, an insulator attached to an end surface of each of the plurality of split iron cores, each end surface being substantially perpendicular to the axis of rotation rotor, each insulator comprising:

a tooth cover for covering the tooth end surface of one of the plurality of split iron cores, an inner wall arranged on the inner peripheral side of the tooth cover, an outer wall arranged on the outer peripheral side of the tooth cover and attached to the rear yoke end face, and a holding part for holding the insulating strip on the end portion in the circumferential direction of the split iron core of at least one outer wall or inner wall, and a coil wound around each of the plurality of split iron cores with at least one tooth cover and an insulating strip therebetween, the retaining part being a retaining tooth which is arranged on the end surface of at least one outer wall or inner wall in their circumferential direction and protrudes in the circumferential direction, wherein the method includes:

fastening of the insulating strip using each retaining tooth,

- 3 CZ 309600 B6 winding the coil around each tooth with at least one tooth cover and an insulating strip between them, and cutting each retaining tooth from each insulator.

According to another aspect of this invention, a method of manufacturing an electric motor has also been developed, comprising:

a rotor rotatable about an axis of rotation, a plurality of split iron cores arranged in an annular pattern so as to surround the rotor, each of the plurality of split iron cores comprising:

a back yoke, and a tooth extending from the back yoke toward the rotor, an insulating strip attached to each of the plurality of split iron cores, an insulator attached to an end surface of each of the plurality of split iron cores, each end surface being substantially perpendicular to the axis of rotation rotor, each insulator comprising:

a tooth cover for covering the tooth end surface of one of the plurality of split iron cores, an inner wall arranged on the inner peripheral side of the tooth cover, an outer wall arranged on the outer peripheral side of the tooth cover and attached to the rear yoke end face, and a holding part for holding the insulating strip on an end portion in the circumferential direction of the split iron core of at least one outer wall or inner wall, and a coil wound around each of the plurality of split iron cores with at least one tooth cover and an insulating strip therebetween, the method comprising:

attaching the insulating strip part with retaining teeth arranged at both ends of each inner wall such that the insulating strip part covers each inner circumferential surface in the radial direction of each tooth by passing through a plurality of split iron cores, winding the coil around each tooth with at least one cover tooth and the insulating strip therebetween, cutting off a portion of the insulating strip at each cutting position which is an inner position with respect to each tooth in the radial direction to form each cut-out portion, and folding each cut-out portion of the insulating strip on the outside in the radial direction to cover each coils with insulating tape.

Within the framework of this invention, a compressor was also developed, containing:

electric motor, containing:

- 4 CZ 309600 B6 rotor, rotatable about an axis of rotation, a set of split iron cores which are arranged in an annular pattern so as to surround the rotor, each set of split iron cores comprising:

a rear yoke, and a tooth extending from the rear yoke toward the rotor, an insulating strip attached to each of the sets of split iron cores, an insulator attached to an end face of each of the sets of split iron cores, each end face being substantially perpendicular to the axis of rotation rotor, each insulator comprising:

a tooth cover that covers a tooth end surface of one of the plurality of split iron cores, an inner wall arranged on the inner peripheral side of the tooth cover, an outer wall arranged on the outer peripheral side of the tooth cover and attached to the end face of the rear yoke, and a holding part that holds an insulating strip on the end portion in the circumferential direction of the split iron core of at least one outer wall or inner wall, and a coil wound around each of the sets of split iron cores with at least one tooth cover and an insulating strip between them, a crankshaft attached to the center of the rotor, and compression chamber where the coolant is compressed through the rotation of the crankshaft.

An electric motor according to one aspect of the present invention is constructed in such a way that insulators arranged on the end face of each of the sets of split iron cores in the axial direction are provided with retaining teeth that are attached to each tooth and the back yokes of each of the sets of stator iron cores, and hold the ends insulating strip in the form of foil.

The holding parts are arranged outside the range of the groove around which the coil is wound.

An advantage is therefore achieved in that operational efficiency can be increased by increasing the effective area of the grooves around which the coils are wound.

In addition, according to one aspect of the present invention, the holding portion of the insulator is constructed so that it does not contact the wound coil.

Therefore, the projection of the holding part does not cause friction on the coil, so that an advantage is obtained in terms of increasing the reliability of the insulation by preventing damage to the insulation coating.

In a compressor, the refrigerant is compressed using an electric motor that has a rotor and stators having a large effective area for the grooves around which the coil is wound.

Therefore, the advantage is achieved that it is possible to increase the operating efficiency.

- 5 CZ 309600 B6

Clarification of drawings

The invention will be further explained in more detail on examples of its implementation, the description of which will be given taking into account the attached drawings, where:

Fig. 1 shows an oblique perspective view of an electric motor according to a first exemplary embodiment of the present invention;

Fig. 2 shows an exploded perspective view of a split core of an electric motor according to a first exemplary embodiment of the present invention;

Fig. 3 shows an oblique perspective view of a split core of an electric motor according to a first exemplary embodiment of the present invention;

Fig. 4 is a cross-sectional view showing the positional relationship between the retaining teeth and the insulating belt of the electric motor according to the first exemplary embodiment of the present invention;

Fig. 5 is an oblique perspective view showing an exemplary method of assembling an electric motor stator according to a first exemplary embodiment of the present invention;

Fig. 6 is an oblique perspective view showing an exemplary method of assembling an electric motor stator according to a first exemplary embodiment of the present invention;

Fig. 7 is a top plan view showing an exemplary method of assembling an electric motor stator according to a first exemplary embodiment of the present invention;

Fig. 8A and Fig. 8B are top plan views showing an exemplary method of mounting an electric motor stator according to a first exemplary embodiment of the present invention;

Fig. 9 shows an oblique perspective view of the electric motor stator according to the first exemplary embodiment of the present invention;

Fig. 10 is an exploded perspective view showing an exemplary method of assembling an electric motor stator according to a second exemplary embodiment of the present invention;

Fig. 11 is an oblique perspective view showing an exemplary method of assembling an electric motor stator according to a second exemplary embodiment of the present invention;

Fig. 12 is a sectional view showing that the electric motor stator according to the second exemplary embodiment of the present invention is arranged in a ring shape;

Fig. 13 is a cross-sectional view showing the positional relationship between teeth on the inside and teeth on the outside of the electric motor stator according to the second exemplary embodiment of the present invention;

Fig. 14A and Fig. 14B are oblique perspective views showing that the electric motor stator according to the second exemplary embodiment of the present invention is arranged in a ring shape;

Fig. 15 is an oblique perspective view showing another exemplary method of assembling an electric motor stator according to a second exemplary embodiment of the present invention;

Fig. 16 is an oblique perspective view showing another exemplary stator of an electric motor according to a second exemplary embodiment of the present invention;

- 6 CZ 309600 B6 Fig. 17A and Fig. 17B show oblique perspective views of a split core of an electric motor according to a third exemplary embodiment of the present invention;

Fig. 18A and Fig. 18B are oblique perspective views of another split electric motor core according to a third exemplary embodiment of the present invention;

Fig. 19 is an oblique perspective view showing a method of assembling a split electric motor core according to a fourth exemplary embodiment of the present invention;

Fig. 20 is an oblique perspective view showing a method of an electric motor according to a fourth exemplary embodiment of the present invention;

Fig. 21 is an oblique perspective view showing a method of an electric motor according to a fourth exemplary embodiment of the present invention;

Fig. 22 is an oblique perspective view showing a method of an electric motor according to a fourth exemplary embodiment of the present invention;

split core assembly split core assembly split core assembly Fig. 23 is an oblique perspective view of a case where the inner peripheral side ends of each of the foil-shaped insulation strips of the split core according to the fourth exemplary embodiment of the present invention are bent toward the inner radius side;

Fig. 24A to Fig. 24C are cross-sectional views showing a manufacturing method of an electric motor stator according to a fifth exemplary embodiment of the present invention; and Fig. 25 shows a sectional view of a compressor according to a sixth exemplary embodiment of the present invention.

Examples of implementation of the invention

First exemplary embodiment

Giant. 1 shows an oblique perspective view of the electric motor 1 according to the first exemplary embodiment of the present invention.

The electric motor 1 basically has a columnar rotor 2, located in its center, and a stator 3, arranged in an annular shape so as to surround the side of the outer radius of the surface of the rotor 2.

The crankshaft 4 is fixedly mounted on the center of the rotor 2, while the stator 3 is formed from twelve split cores 5.

If an electric current is supplied to the split cores 5, the rotor 2 rotates around the axis 4a of rotation of the crankshaft 4.

In the first exemplary embodiment, an explanation is given of the stator 3 formed of twelve divided cores 5. However, the number of divided cores 5 is not limited to only twelve. Any number of split cores is acceptable as long as the number of split cores is plural.

The split cores 5 of the stator 3 will now be described with reference to Fig. 2. Fig. 2 shows an exploded perspective view of the split core 5.

The split core 5 has a split stator iron core 6, insulators 7 and foil-shaped insulating strips 8. The split stator iron core 6 is formed by stacking thin plates of magnetic material such as iron and copper.

- 7 CZ 309600 B6

The insulators 7 are formed by a pair of insulating members which are made of resin and which are placed on the respective end surfaces of the divided stator iron core 6, essentially perpendicular to the rotation axis 4a.

The foil-shaped insulating strips 8 include two strips which are attached so as to cover the right and left side surfaces of the divided stator iron core 6 except for the front surfaces acting as the outer peripheral surface and the inner peripheral surface of the stator.

A detailed explanation of the shape and arrangement of the divided stator iron core 6, the insulators 7 and the foil-shaped insulating strips 8 will be given next.

Each of the split stator iron cores 6 has a rear yoke 9 that extends within a given range of a circular arc in the circumferential direction of the stator 3 and a tooth 10 that extends from the center of the rear yoke 9 inwardly along the radial direction of the stator 3, particularly toward the rotor 2 The front end 11 of the tooth 10, located at the apex of the tooth 10, takes a shape whose end protrudes beyond the tooth 10 in the circumferential direction.

Grooves around which the coil is to be wound are formed in the rear yoke 9, the tooth 10 and the front end of the tooth.

The inner circumferential surface 11a of the front end 11 of the tooth 10, i.e. the inner side of the front end 11 of the tooth 10, forms in its radial direction a circumferential curved surface against the rotor 2 with a clearance located between them.

Each of the insulators 7 consists of an outer wall 12 placed against the rear yoke 9, an inner wall 13 placed against the front end 11 of the tooth 10, and covers 14 of the tooth 10, each of which is placed between the outer wall 12 and the inner wall 13 and covers and isolates end face of tooth 10.

The insulator 7 is positioned so that the outer wall 12 extends to the outer peripheral side of the stator 3 of the cover 14 of the tooth 10, arranged on the end surface of the tooth 10, while the inner wall 13 extends to the inner peripheral side of the stator 3.

The outer wall 12 is attached to the end face of the rear yoke 9, the cover 14 of the tooth 10 is attached to the end face of the tooth 10, and the inner wall 13 is attached to the front end 11 of the tooth 10.

A set of attachment teeth, serving as attachment parts for temporarily attaching the insulation strips 8 in the form of a foil, are arranged on the respective side end surfaces of the outer wall 12 and on the respective side end surfaces of the inner wall 13 in the circumferential direction of the stator 3.

The inner tooth 15a on the outer side and the outer tooth 15b on the outer side are arranged on both side ends of the outer wall 12 in its circumferential direction.

The inner tooth 15a on the outer side is formed on one side end of the outer wall 12 somewhat toward the inner radius side, and the outer tooth 15b on the outer side is formed on the other side end of the outer wall 12 somewhat toward the inner radius side for the purpose of directing of the divided stator iron core 6 in the direction of the axis of rotation 4a and to protrude from the respective side ends of the rear yoke 9 in the circumferential direction.

As with the outer wall 12, the inner tooth 16a on the inner side and the outer tooth 16b on the inner side are arranged on both side ends of the inner wall 13 in its circumferential direction.

The inner tooth 16a on the inner side is formed on one side end of the inner wall 13 somewhat towards its inner radius side, while the outer tooth 16b on the inner side is formed on the other side end of the inner wall 13 somewhat towards its inner radius side, behind

- 8 CZ 309600 B6 for the purpose of directing the divided stator iron core 6 in the direction of the axis of rotation 4a and for protruding from the respective side ends of the front end 11 of the tooth 10 in its circumferential direction.

The insulators 7 are attached to the split stator iron core 6 by, for example, a pin fixed in a hole (not shown) formed in the split stator iron core 6.

In the first exemplary embodiment, an explanation will be given of the structure by means of which the retaining part is realized in the form of a retaining tooth. However, the holding part is not specifically limited to only the holding teeth.

Alternatively, slots or clips may also be arranged at the side ends of the outer wall 12 and at the side ends of the inner wall 13 in their circumferential direction, and the foil-shaped insulating strip 8 may be inserted into the slots or clips to fix it.

In the first exemplary embodiment, the upper insulator 7 according to Fig. 2 is considered the first insulator, while the lower insulator 7 is considered the second insulator. Characteristic parts take the same shape, but are marked with the same reference sign.

Giant. 2 shows that the first insulator and the second insulator are arranged on the respective end faces of the divided stator iron core 6 in the direction of the axis of rotation of the crankshaft 4.

However, insulators are not limited to the same shape, as they can also take mutually different shapes.

For example, if only one insulator is provided with a holding part and if the foil-shaped insulating strip 8 can be attached only through the holding part, then a structure in which the other insulator is not provided with a holding part can also be arranged.

In addition, a structure can also be arranged in which the holding part of one insulator is realized in the form of a holding tooth, while the holding part of the other insulator is realized in the form of slots formed at the respective peripheral ends of the outer wall 12 contacting the divided stator iron core 6 and at the respective peripheral ends of the inner wall 13, contacting the divided stator iron core 6.

Giant. 2 shows a structure in which the outer wall 12 and the inner wall 13 of each of the insulators 7 is provided with retaining teeth. However, a structure can also be arranged in which either the outer wall 12 or the inner wall 13 is provided with retaining teeth, if the insulating strip 8 in the form of a foil can be attached with retaining teeth.

Although Fig. 2 shows a structure in which the clearance space for the tooth in which the holding tooth of the adjacent split core is accommodated, if the split cores 5 are arranged in an annular pattern, is arranged at the base of the holding tooth, another structure may also be arranged which it does not contain any clearance, as will be described in connection with the third and fourth exemplary embodiments, which will be described later.

The structure of the gap space for the tooth in the first exemplary embodiment will be described later.

Each of the foil-shaped insulating strips 8 covers the inner peripheral area of the rear yoke 9 of each split stator iron core 6, each of the teeth 10, and the side surface of the outer peripheral area of each of the front ends 11 of the tooth 10.

In the case where the foil-shaped insulating strip 8 and the insulator 7 are attached to the split stator iron core 6, the foil-shaped insulating strip 8 is folded, and the intersection of the rear yoke 9 and the tooth 10 of the split stator iron core 6 is aligned with the straight line 17a, as shown in Fig. 2, with the intersection of the tooth 10 and the front end 11 of the tooth 10 aligned

- 9 CZ 309600 B6 with the straight line 17b and the intersection of the outer peripheral side of the front end 11 of the tooth 10 in the radial direction and the divided stator iron core 6 is aligned with the straight line 17c.

Next, two insulating strips 8 in the form of a foil, folded while aligning the intersections on the split stator iron core 6, are brought into close contact with the split stator iron core 6.

The insulators 7 are attached to the respective side surfaces of the split stator iron core 6 from both sides in the axial direction of the split stator iron core 6 such that the foil-shaped insulating strip 8 is inserted into the clearance between the rear yoke end 9 of the split stator iron core 6 and the inner tooth. 15a on the outer side, and between the rear end of the rear yoke 9 of the split stator iron core 6 and the outer tooth 15b on the outer side, the insulating strip 8 being similarly inserted into the clearance between the two ends of each of the front ends 11 of the tooth 10 and the inner teeth 16a on the inner side, and into the clearance between both ends of each of the front ends 11 of the tooth 10 and the inner teeth 16b on the inner side.

Subsequently, the coil is wound around the tooth 10 by means of insulators 7 and insulating strips 8 in the form of a foil, whereby the divided core 5 is assembled.

The foil-shaped insulating strip 8 is formed as an insulator, made of resin or plastic, for example PET (polyethylene terephthalate).

It is preferable that the thickness of the foil-shaped insulating strip is in the range of 0.075 to 0.25 mm, so that it is weaker than the weakest part of the insulator 7, made of, for example, resin.

Giant. 3 shows a split core 5 comprising a coil 18 wound around a tooth 10 of a split stator iron core 6 and covered by insulators 7 and foil-shaped insulating strips 8.

The outer peripheral side ends 8a of the two foil-shaped insulating strips 8 are respectively clamped between the inner teeth 15a on the outer side and between the outer teeth 15b on the outer side.

In addition, the inner peripheral side ends 8b of the two foil-shaped insulating strips 8 are respectively clamped between the inner teeth 16a on the inner side and the outer teeth 16b on the inner side.

The split stator iron core 6 and the coil 18 are electrically insulated from each other by means of insulators 7 and insulating strips 8 in the form of a foil.

As shown in Fig. 3, by means of the foil-shaped insulating strips 8 of Fig. 2, the coil 18 is wound around the groove which is formed by the rear yoke 9 and the front end 11 of the tooth 10, and which is further formed by the outer walls 12 , inner walls 13 and covers 14 of the insulator tooth 7.

The outer peripheral side ends 8a of the foil-shaped insulating strips 8 are pressed in the direction of arrow A, while the inner peripheral side ends 8b of the foil-shaped insulating strips 8 are pressed in the direction of arrow B.

The outer peripheral side ends 8a can be easily taken out from the inner teeth 15a on the outer side and from the outer teeth 15b on the outer side.

The inner peripheral side ends 8b can be easily taken out from the inner teeth 16a on the inner side and from the outer teeth 16b on the inner side.

The outer peripheral side ends 8a of the foil-shaped insulating strips 8 are bent toward the inner radius side in the radial direction, and the inner peripheral side ends 8b of the foil-shaped insulating strips 8 are bent toward the outer radius side in the radial direction.

- 10 CZ 309600 B6

Giant. 4 shows the mutual positional relationship between the end of the front end 11 of the tooth 10 of the split stator iron core 6, the foil-shaped insulating strip 8 and the outer teeth 16b on the inner side.

If the thickness of the foil-shaped insulating strip 8 is taken as "t" and if the height of the overlap 19 between the outer wall 12 of the insulator 7 and the foil-shaped insulating strip 8 is taken as "L", then the clearance "C" between the front ends of the outer teeth 16b on the inner side and the end surface of the front end 11 of the tooth 10 in the direction of the rotation axis 4a is defined by the relation

H<C<L/3.

The clearance "D" between the outer teeth 16b on the inner side and the front end of the front end 11 of the tooth 10 in its circumferential direction is defined by the relation t<D<5t.

If the coil 18 is wound, the outer teeth 16b on the inner side can grip the inner circumferential side end 8b of the foil-shaped insulating strip 8 without failure.

The height L of the overlap 19 is set to at least 2 mm or more.

Therefore, the surface distance between the coil wound in the following process and the split stator iron core 6 can be set to 2 mm or more, so that the insulation reliability of the electric motor can be increased.

Although the outer teeth 16b on the inner side are described with reference to Fig. 4, the same applies to the other retaining teeth.

A method of assembling the stator 3 by bringing a plurality of split cores 5 into close contact with each other in an annular pattern will now be described with reference to Fig. 5 and Fig. 6.

A tooth clearance space, taking a recessed shape or a cut-out shape, is formed at the base of each of the retaining teeth on the outer wall 12 of the insulator 7 in the first exemplary embodiment and at the base of each of the retaining teeth on the inner wall 13 of the insulator 7.

The free space 20 of the tooth on the outer side is arranged on the outer peripheral side of the base of each of the inner teeth 15a on the outer side.

The free space 20b of the outer side tooth is arranged on the inner peripheral side of the base of each of the outer side teeth 15b.

Similarly, the free space 21a of the tooth on the inner side is arranged on the inner peripheral side of the base of each of the inner teeth 16a on the inner side.

The free space 21b of the inner side tooth is arranged on the inner peripheral side of the base of each of the inner side outer teeth 16b.

The inner tooth 16a on the inner side of the split core 5 on the right side as shown in Fig. 5 is fixed in the radial direction and in the direction of arrow F, while the outer tooth 16b on the inner side of the adjacent split core on the left side is fixed in the radial direction and in the direction of arrow E, while there is an overlap in the circumferential direction between the teeth.

Similarly, the inner tooth 15a on the outer side is attached in the radial direction and in the direction of arrow H, while the outer tooth 15b on the outer side of the adjacent split stator iron core 6 is attached in the radial direction and in the direction of arrow G, while overlapping in the circumferential direction

- 11 CZ 309600 B6 between the teeth.

Therefore, the inner tooth 15a on the outer side fits into the free space 20b of the tooth on the outer side.

Similarly, the outer tooth 15b on the outer side fits into the free space 20a of the tooth on the outer side, the inner tooth 16a on the inner side fits into the free space 21b of the tooth on the inner side, and the outer tooth 16b on the inner side fits into the free space 21a of the tooth on the inner side.

As shown in Fig. 6, if the stator is assembled by placing a predetermined number of split cores 5 in an annular pattern, the respective retaining teeth are placed in the corresponding tooth clearance spaces without interfering with each other, thereby creating an overlap in the circumferential direction without making contact.

Giant. 12 shows a split core 5, with the coil 18 and foil-shaped insulating strip 8 omitted.

Giant. 7 is a plan view showing that a plurality of split cores are brought into contact with each other, the retaining teeth of one split core 5 being accommodated in the corresponding clearance spaces of the teeth of the second split core 5.

The outer peripheral side end 8a of the foil-shaped insulating strip 8 is folded to the inner radius side in the radial direction in the manner shown in the case of Fig. 3, while the inner peripheral side end 8b of the foil-shaped insulating strip 8 is folded to the outer radius side in in the radial direction before assembling the split cores 5 in an annular shape.

As shown in Fig. 7, the outer peripheral side end 8a is blocked by the inner tooth 15a on the outer side arranged on the insulator 7, so that the outer peripheral side end is prevented from being pinched by the rear yoke end 9 of the adjacent split core 5 .

The inner peripheral side end 8b is blocked by the outer tooth 16b on the inner side arranged on the insulator 7, so that the inner peripheral side end is prevented from extending to the inner radius side from the end of the front end 11 of the tooth 10.

Although Fig. 7 shows an electric motor in which the coil has been omitted, the coil is wound around the groove 22, which is formed from the rear yoke 9 of the divided stator iron core 6, the tooth 10, the front end 11 of the tooth 10, the outer walls 12, the inner walls 13 and covers 14 teeth 10 insulators 7 if the split core 5 is assembled in an annular pattern.

In an exemplary embodiment, the inner tooth 15a on the outer side and the outer tooth 15b on the outer side are arranged on the outer wall 12 of the insulator 7.

The inner tooth 16a on the inner side and the outer tooth 16b on the inner side are arranged on the inner wall 13.

Alternatively, an embodiment can also be used in which only the inner tooth 16a on the inner side and the outer tooth 16b on the inner side are arranged on the inner wall 13, or where only the inner tooth 15a on the outer side and the outer tooth 15b on the outer side are arranged on the outer wall 12.

In Fig. 1, the excess of the inner peripheral side end 8b of the foil-shaped insulating strip 8 is folded towards the groove 22.

Giant. 8 shows a structure where the excess of the inner peripheral side end 8b is arranged at the minimum required surface distance and folded towards the groove 22.

- 12 CZ 309600 B6

Giant. 8A shows that the split cores 5 are arranged in an annular shape for assembling the set of stators 3, while Fig. 8B shows that the retaining tooth is accommodated in the corresponding gap space for the tooth of the adjacent split core 5 as a result of the split cores 5 being arranged in a ring shape.

In Fig. 8A, the inner peripheral side end 8b of the foil-shaped insulating strip 8 is folded so that it runs along the front end 11 of the tooth 10 and is clamped between the front end 11 of the tooth 10 and the inner teeth 16a on the inner side and between the end of the front end 11 tooth 10 and external teeth 16b on the inner side.

According to Fig. 8B, a part of the inner peripheral side end 8b of the foil-shaped insulating strip 8, clamped between the front end 11 of the tooth 10 and the inner teeth 16a on the inner side, is pressed by the adjacent outer teeth 16b on the inner side, so that it moves into the free space 21b of the inner dentition.

Similarly, the inner peripheral side end 8b between the end of the front end 11 of the tooth 10a and the outer teeth 16b on the inner side is pressed by the adjacent inner teeth 16a on the inner side so that it moves towards the free space 21a of the inner tooth.

The respective inner peripheral side ends 8b are clamped between the inner teeth 16a on the inner side and the outer teeth 16b on the inner side, as they were formed in the shape of a handle.

In Fig. 8, the width of the inner peripheral side end 8b is equal to or smaller than the width of the edge of the front end 11 of the tooth 10 in its radial direction, and the inner peripheral side end 8b does not protrude toward the side of the inner periphery through the front end 11 of the tooth 10.

As a result of the plurality of split cores 5 being arranged in an annular pattern as mentioned above, it is possible to construct a stator 3 in which there is an overlap between the holding teeth of adjacent split cores as shown in Fig. 9.

As mentioned above, in the electric motor according to the first exemplary embodiment, the coil 18 is wound when the foil-shaped insulating strips 8 are clamped and temporarily held between the divided stator iron core 6 and the inner teeth 15a on the outer side, the outer teeth 15b on the outer side, internal teeth 16a on the inner side and external teeth 16b on the inner side, which are the holding teeth of the insulators 7.

It is thus possible to prevent the positional displacement of the insulating strips 8 in the form of a foil, which would otherwise occur when winding the coil 18.

It is therefore possible to eliminate the need to use glue, which is the base material for attaching the foil-shaped insulating strips 8, the need to use a heat source for thermal welding, or the need to use a special device for attaching the foil-shaped insulating strip 8 to the winding machine.

This ensures a reduction in material costs and operating costs for the production machine.

The retaining teeth of the insulator 7 are arranged at the ends of the outer wall 12 and at the ends of the inner wall 13 in their circumferential direction, which lie outside the range of the groove around which the coil 18 is wound.

There is thus no contact between the holding teeth and the coil 18, which would otherwise occur during the winding operation.

In addition, damage to the insulating coating of the coil 18 that would otherwise occur through contact can be prevented.

- 13 CZ 309600 B6

It is thus possible to create an electric motor that exhibits high insulation reliability.

The shape of the end of the insulator 7, which contacts both ends of the split stator iron core 6 in the direction of the axis of rotation, is further formed to prevent the coil 18 from bulging out of the groove around which the coil 18 is wound in the direction of the axial ends of the split stator iron core 6.

Thus, the groove area in addition to the thickness of the foil-shaped insulating strip 8 becomes the effective groove area, so that the space factor is supported by increasing the thickness of the coil 18 and the number of turns of the coil 18, and the operating efficiency of the electric motor can be increased.

Since each of the retaining teeth protrudes in the circumferential direction and since there is an overlap between the retaining teeth, the clearance between the edges of the front ends 11 of the teeth 10 of the adjacent split cores 5 at both axial ends of the split stator iron core 6 is closed.

This has the effect of preventing the excess of the inner peripheral side end 8b of the foil-shaped insulating strip 8 from extending out of the clearance between the edges of the front ends 11 of the teeth 10 of the adjacent split cores 5.

In addition, it is also possible to clamp both axial ends of the excess inner peripheral side end 8b when forming the axial ends into a crank shape.

This also has the effect of preventing vibration and positional displacement of the inner peripheral side end 8b of the foil-shaped insulating strip 8, which would otherwise occur through vibration transmission during the operation of the electric motor.

In addition, the clearance between the ends of the adjacent rear yokes 9 is also closed.

Thus, it is also possible to prevent the excess of the outer circumferential side end 8a of the foil-shaped insulating strip 8 from being pinched between the ends of the adjacent rear stirrups 9, which would otherwise result in the arrangement of the split cores 5 in an annular pattern.

As a result, ease of assembly is enhanced, and an electric motor exhibiting high insulation reliability can be formed.

Second exemplary embodiment

Although the first exemplary embodiment is directed to an arrangement in which the respective split stator iron cores 6 are not connected together, the second exemplary embodiment is directed to an arrangement used in the case of using connected divided stator iron cores 6 in which the rear yokes 9 are adjacently arranged divided stator iron cores connected together via thin wall sections or the like.

Elements that are the same as those described in connection with the first exemplary embodiment are denoted by the same reference numerals, and their repeated explanation will be omitted for brevity.

Giant. 10 is an exploded perspective view showing the assembly procedure of the electric motor stator in the second exemplary embodiment.

Giant. 11 shows an oblique perspective view of the stator.

As shown in Fig. 10, the split stator iron core 30 takes the shape formed as a result of the ends of the rear yokes 9 being connected together by the thin wall portions 31.

- 14 CZ 309600 B6

Each of the thin wall portions 31 is formed on the side of the outer circumference of the side surface of the rear yoke 9.

The connected split stator iron cores are arranged in a ring pattern by bending the thin wall sections 31.

Although the connecting parts are described as thin-walled parts 31 having a flexible thickness in the second exemplary embodiment, an arrangement having a given thickness and which does not involve the necessity of bending, especially the stator iron core formed in an integrated annular shape, can also be used for the connections.

In such a case, the joints are used in conjunction with an insulator which has an outer wall of an annular shape, and which has retaining teeth arranged exclusively on both ends of the inner wall in its circumferential direction.

Regarding the assembly procedures of the foil-shaped insulating strips 8 and the insulators 7 into the connected split stator iron core 30, the insulating strips 8c, 8d and 8e are subjected to bending forming as shown in Fig. 10 through the first alignment of the intersection of the rear yoke 9 and the tooth 10 with the line 17a, the intersection of the front end 11 and the tooth 10 with the line 17b, and the intersection of the radial outer peripheral side of the front end 11 of the tooth 10 and the inner peripheral side end of the split iron core with the line 17c for each of the split stator iron cores 30a, 30b and 30c of the combined split stator iron core 30.

Between the split stator iron cores located at both ends of the line of the split stator iron cores of the connected split stator iron core 30, the split stator iron core 30a is brought into close contact with the foil-shaped insulating strip 8c, folded into alignment with the intersection, from the right side, the split stator iron core 30b, which is located at the other end, is brought into close contact with the foil-shaped insulating strip 8d from the left side.

Due to the spaces between the remaining adjacent split stator iron cores 30a to 30c, the foil-shaped insulating strips 8e are brought into close contact with the adjacent grooves of the respective split stator iron cores 30a to 30c.

As further shown in Fig. 11, the insulators 7 are attached to both axial ends of the connected split stator iron core 30 in such a way that the inner peripheral side ends 8b of the respective foil-shaped insulating strips 8c, 8d and 8e are respectively inserted into the end-to-end clearance of the front end 11 of the tooth 10 and the inner teeth 16a on the inner side, and the clearance between the end of the front end 11 of the tooth 10 and the outer teeth 16b on the inner side.

Of the plurality of split stator iron cores in the connected split stator iron core 30, the split stator iron core 30a, located at one end, includes an outer peripheral side end 8a of a foil-shaped insulating strip 8c, inserted and clamped in the clearance between the end of the front end 11 of the tooth 10 and outer teeth 15b on the outer side, while the split stator iron core 30b, located at the other end, includes the outer peripheral side end 8a of the foil-shaped insulating strip 8d, inserted and clamped in the clearance between the front end end 11 of the tooth 10 and the inner teeth 15a on on the outside.

After winding the coil, the outer peripheral side end 8a of the foil-shaped insulating strip 8c is taken out of the clearance between the front end 11 of the tooth 10 of the split stator iron core 30a and the outer teeth 15b on the outside.

Similarly, the outer peripheral side end 8a of the foil-shaped insulating strip 8d is taken out of the clearance between the end of the front end 11 of the tooth 10 of the split stator iron core 30b and the inner teeth

- 15 CZ 309600 B6

15a on the outside.

In the exemplary embodiment shown in Fig. 10 and Fig. 11, five split stator iron cores are connected together by thin wall portions 31.

However, it is better to set the number of connections between the split stator iron cores according to the requirement.

It will be understood that the entire connected split stator iron core 30 forming the stator of the electric motor may also be connected together.

Now, the method of mounting the motor stator, following the winding of the coil, will be further explained.

Giant. 12 is a sectional view showing a state in which the motor stator 3 is assembled by arranging the connected split stator iron core 30 in a ring pattern.

The thin wall portions 31 of the connected split stator iron core 30 are folded to bring the rear yoke end 9 of the split stator iron core 30a at one end of the connected split stator iron core 30 and the rear yoke end 9 of the split stator iron core 30b into close contact with each other and in an annular pattern .

The outer peripheral side end 8a of the foil-shaped insulating strip 8c of the split stator iron core 30a, which is one end of the connected split stator iron core 30, and the outer peripheral side end 8a of the foil-shaped insulating strip 8d of the split stator iron core 30b, which is the other end of the connected split stator iron core 30, are bent towards the inner radius side with respect to the radial direction.

Due to the arrangement of the connected divided stator iron core 30 in an annular pattern, there is an excess in the respective regions covering the inner peripheral surfaces of the rear yokes 9 of the foil-shaped insulating strips 8e that are folded toward the inner radius side from the adjacent ends of the respective rear yokes 9 with respect to in the radial direction, which creates surpluses 8f.

Giant. 13 shows a drawing of teeth 15 on the outside and teeth 16 on the inside, arranged on the respective insulators 7.

Assuming that the tangent radius of the circle to the outer circumference of the inner circumference 16a on the inner side from the thin wall portion 31, which allows bending of the connected divided stator iron core 30, and which acts as a base location, is taken as I, and the radius of the circle tangent to the outer the circumference of the outer tooth 16b on the inner side is taken as J, the tangent radius of the circle to the outer circumference of the inner tooth 15a on the outer side is taken as M, and the tangent radius of the circle to the outer circumference of the outer tooth 15b on the outer side is taken as N, so it is determined , that

I > J a

M > N.

If the split stator iron cores 30a, 30b, and 30c are arranged in a ring pattern by bending the thin wall portions 31 of the connected split stator iron core 30, then the inner teeth 15a on the outer side, the outer teeth 15b on the outer side, the inner teeth 16a on the inner side, and the outer teeth 16b on the inner side can overlap each other in the radial direction without mutual interference.

- 16 CZ 309600 B6

Assuming that the radius of the circle tangent to the inner tooth 16a on the inner side from the radial center of the motor stator is taken as K, and the inner radius of the motor stator is taken as R, it is determined that

K > R.

It is thus possible to prevent contact between the rotor 2 of the electric motor and the inner tooth 16a on the inner side.

The outer peripheral part of the inner tooth 15a on the outer side lies on the extension of the surface of the groove 22 of the rear yoke 9 or on the side of the rear yoke, thereby preventing the inner teeth 15a on the outer side from interfering with the groove 22.

Assuming that the distance from the intersection of the extension of the front ends 11 of the teeth 10 near the groove 22 to the outer circumference of the outer tooth 16b on the inner side is taken as P, it is determined that

P >0.

It is thus prevented that the internal tooth 16a on the inside interferes with the groove 22 around which the coil is wound.

Each of the insulators arranged on the connected split stator iron core 30 in the exemplary embodiment of Figs. 10 to 13 is provided with an inner tooth 15a on the outer side, an outer tooth 15b on the outer side, an inner tooth 16a on the inner side and an outer tooth 16b. on the inner side.

However, if necessary, the number of gripping teeth can also be regulated as shown in Fig. 14A and Fig. 14B.

Giant. 14A shows that the insulators are arranged on the connected split stator iron core 30.

Giant. 14B shows that the foil-shaped insulating strip is held by means of holding teeth arranged at both side ends of each of the insulators.

In all of the insulators 7a, 7b and 7c shown in Fig. 14, the inner wall 13 is provided with inner teeth 16a on the inner side and outer teeth 16b on the inner side.

Of the plurality of divided stator iron cores, the divided stator iron core 30a arranged at one end is provided with an insulator 7a attached to the divided stator iron core 30a, and the divided stator iron core 30b arranged at the other end is provided with an insulator 7b attached to the divided stator iron core stator iron core 30b.

The outer teeth 15b on the outer side are arranged only at two places on the outer wall 12 of the insulator 7a.

The inner teeth 15a on the outer side are arranged only in two places on the outer wall 12 of the insulator 7b.

The insulator 7a is arranged on the split stator iron core at the right end of the connected split stator iron core 30 as shown, while the insulator 7b is arranged on the split stator iron core at the left end of the connected split stator iron core 30.

- 17 CZ 309600 B6

Giant. 14B shows that the respective foil-shaped insulating strips 8c, 8d and 8e are held between the gripping teeth.

The foil-shaped insulating strips 8c, 8d, and 8e are the same as their counterparts shown in Fig. 11 in terms of strip shape and arrangement of gripping teeth, so their explanation will be omitted for brevity.

Giant. 15 shows that the connected split stator iron core 30 of Fig. 14 is arranged in an annular pattern.

As in the case of the first exemplary embodiment, the outer side tooth clearance 20a is arranged at the base of each outer side inner tooth 15a at the insulator 7a, and the outer side tooth clearance 20b is arranged at the base of each of the outer side teeth 15b.

The inner side tooth clearance 21a is arranged at the base of each of the inner side teeth 16a, and the inner side tooth clearance 21b is arranged at the base of each of the inner side teeth 16b.

As a result, the inner tooth 16a on the inner side and the outer tooth 16b on the inner side are respectively accommodated in the free space 21a of the inner side tooth and the free space 21b of the inner side tooth without interfering with each other, while a gap is formed in the peripheral direction.

The inner tooth 15a on the outer side and the outer tooth 15b on the outer side are respectively accommodated in the free space 20a of the outer side tooth and the free space 20b of the outer side tooth without mutual interference, while a gap is formed in the circumferential direction.

In the second exemplary embodiment, an explanation has been given with reference to Fig. 10 to Fig. 15 in the case of using the connected split stator iron core 30, where the rear yokes 9 of the split stator iron cores, connected to each other, are connected together through the thin wall parts 31.

However, an arrangement in which the thin wall portions 31 are replaced by joints, as shown in Fig. 16, can also be used.

A pivot joint 33 is arranged at both side ends of each of the rear yokes 9 of the respective split stator iron cores of the connected split stator iron core 32 shown in Fig. 16 .

The joints 33 are arranged to be freely rotatable due to the side ends of the rear yokes 9 of the connected split stator iron cores at the connected split stator iron cores 32 overlapping each other and fixed to each other by pins or the like.

In particular, the joints 33 are constructed so that the respective split stator iron cores can be easily positioned in an annular pattern by rotating the connected split stator iron cores 32 connected together by the joints 33.

Since the insulators arranged on both axial end surfaces of the respective coupled split stator iron cores 32 have the same arrangement as described with reference to Fig. 10, Fig. 11 and Fig. 14, further explanation thereof will be omitted.

As mentioned above, in the second exemplary embodiment, as the corresponding split stator iron cores, a connected split stator iron core, connected together

- 18 CZ 309600 B6 through thin wall parts 31, or connected divided stator iron cores 32, connected together through connections 33.

As a result, the respective split stator iron cores are prevented from being separated during assembly, achieving easy handling.

It is also possible to easily position and fasten the split stator iron cores in a ring pattern by bending the thin wall sections 31 or turning the joints 33.

The same advantages as achieved in the first exemplary embodiment are also achieved through the attachment of insulating members to the connected split stator iron core 30 or 32.

A third exemplary embodiment

In the case of the first and second exemplary embodiments, a structure was explained where a tooth clearance is arranged at the base of each of the holding jaws of the insulator, with the split cores arranged in a ring pattern, and the holding teeth are accommodated in the tooth clearances of the adjacent split cores, thereby forming the gap between the retaining teeth.

In contrast to such embodiments, the third exemplary embodiment employs a structure in which the retaining teeth do not project outward from the side ends of the respective split stator iron cores in their circumferential direction.

An explanation will now be given of the design of the insulator designed to eliminate the need for tooth clearance created at the base of the retaining tooth with reference to Fig. 17A, Fig. 17B, Fig. 18A and Fig. 18B.

Giant. 17A, Fig. 17B, Fig. 18A and Fig. 18B show oblique perspective views of the split stator cores used in electric motors according to a third exemplary embodiment.

These elements, which are the same as the elements described in connection with the first and second exemplary embodiments, are denoted by the same reference numerals, and their repeated explanation will be omitted.

Giant. 17A shows a split core which is not yet provided with a foil-shaped insulating strip 8.

The insulator 7d attached to the split core is formed of an outer wall, an inner wall, and a tooth cover, as in the case of the insulator 7 described in connection with the first and second exemplary embodiments.

The teeth 15c on the outer side are arranged on the side end of the outer wall along its circumferential direction, while the teeth 16c on the inner side are arranged on the side end of the inner wall along its circumferential direction.

Unlike the teeth on the outside described in connection with the first and second exemplary embodiments, the teeth 15c on the outside are arranged on the inner sides relative to the position of the rear yoke end 9 of the split stator iron core 6 with respect to the circumferential direction.

Similarly, the teeth 16c on the inner side are arranged on the inner sides relative to the position of the front end 11 of the tooth 10 of the split stator iron core with respect to the circumferential direction.

The teeth 15c on the outer side and the teeth 16c on the inner side are arranged so that they do not protrude

- 19 CZ 309600 B6 from the peripheral side ends of the rear yoke 9 and the peripheral side ends of the front end 11 of the tooth 10 of the divided stator iron core 6 in the peripheral direction.

The width of the rear yoke 9 in its circumferential direction (i.e., the length of the circular arc of the divided stator iron core 6, centered on the axis of rotation 4a) is larger than the circumferential width of the outer wall 12 containing the holding teeth of the insulator 7, or the width of the front end 1 of the tooth 10 in in its circumferential direction is greater than the circumferential width of the inner wall 13 containing the retaining tooth.

On both side surfaces of the outer wall of the insulator 7d, the surroundings of the bases of the respective teeth 15c on the outside are machined in flat surfaces, while the free spaces of the teeth are not created in these surroundings.

Similarly, on both side surfaces of the inner wall of the insulator 7d, the surroundings of the bases of the respective teeth 16c on the inner side are machined in flat surfaces, while the free spaces of the teeth are not created in these surroundings.

The ends of the teeth 15c on the outer side and the ends of the teeth 16c on the inner side are arranged in respective positions where the ends face the end faces of the rear yoke 9 and the end faces of the front ends 11 of the teeth 10 with a clearance between them along the direction of the axis of rotation.

The thickness of the clearance is at least equal to or greater than the thickness of the foil-shaped insulating strip attached to the split core.

Giant. 17B shows a split core to which a foil-shaped insulating strip 8 has been attached.

The foil-shaped insulating strip 8 is held by the teeth 15c on the outer side and the teeth 16c on the inner side due to their insertion into the clearance existing between the end of the teeth 15c on the outer side and the end of the rear yoke 9 in the direction of the rotation axis, and their insertion into the clearance, existing between the ends of the teeth 16c on the inner side and the end of the front end 11 of the tooth 10 in the direction of the axis of rotation.

Giant. 18A shows another split core, different from the split core shown in Fig. 17A and Fig. 17B, which is not yet attached to the foil-shaped insulating strip 8.

In the rear yoke 9 of the split stator iron core shown in Fig. 18A and Fig. 18B, cut-outs 34 are formed in both peripheral end portions on the end surfaces in the direction of the axis of rotation of the rear yoke 9.

The insulator 7e attached to the split stator iron core is formed of an outer wall, an inner wall, and a tooth cover in the same manner as the insulator 7d of Fig. 17A and Fig. 17B.

The teeth 15d on the outer side are arranged on the inner side compared to the position of the rear yoke 9 with respect to the circumferential direction, and the teeth 16d on the inner side are arranged on the inner side compared to the position of the front end 11 of the tooth 10 with respect to the circumferential direction.

In the state where the insulators 7e are attached to the split stator iron core, the teeth 15d on the outer side extend inward with respect to both end faces of the rear yoke 9 in its axial direction and are accommodated in the corresponding cutouts 34.

The teeth 15d on the outside and the corresponding cutouts 34 are placed with a clearance having at least the thickness of the foil-shaped insulating tape or more between them.

Giant. 18B shows a split core to which a foil-shaped insulating strip 8 has been attached.

The foil-shaped insulating strip 8 is gripped by the teeth 15d on the outside as a result of its insertion into

- 20 CZ 309600 B6 the clearance existing between the teeth 15d on the outside and the corresponding cutouts 34, and the teeth 16d on the inside due to its insertion into the clearance existing between the teeth 16d on the inside and the edges on both end surfaces of the front end 11 of the tooth 10 in the direction of the axis of rotation.

Similarly to the split cores of Fig. 17A and Fig. 17B, the teeth 15d on the outer side are arranged so that they do not protrude from both side end surfaces of the rear yoke 9 of the split stator iron core 6 in its circumferential direction, while the teeth 16d on the inner side are arranged so , that they do not protrude from the side end surfaces of the front end 11 of the tooth 10 in its circumferential direction.

The width of the rear yoke 9 in its circumferential direction (the length of the circular arc of the divided stator iron core 6, centered on the axis of rotation) is greater than the circumferential width of the outer wall 12 containing the retaining teeth of the insulators 7e.

The width of the front end 11 of the tooth 10 is greater in the circumferential direction than the circumferential width of the outer wall 13 containing the retaining teeth.

As mentioned above, the retaining teeth of the insulators 7d and 7e of the electric motor according to the third exemplary embodiment are located inside relative to the ends of the divided stator iron core in the circumferential direction.

Therefore, it is not necessary to arrange the base of the retaining tooth with free tooth space.

The inner wall and the outer wall of each of the insulators are formed as a surface, so that the manufacturing cost of machining can be reduced.

An economical and highly efficient electric motor can thus be created.

Fourth exemplary embodiment

In the case of the first to third exemplary embodiments, a structure has been explained in which the free space of the tooth is arranged in the base of the retaining tooth, and the retaining tooth is accommodated in the respective free space of the tooth in the adjacent split core, and the split cores are arranged in an annular pattern.

However, with reference to Fig. 19 to Fig. 23, an explanation will be provided of the fourth exemplary embodiment, regarding the method of manufacturing the electric motor, where the necessity of arranging the holding teeth is eliminated, thereby arranging the free spaces of the teeth, by cutting the holding teeth from the respective split cores after winding coils.

Elements that are identical to those described in connection with the first to third exemplary embodiments are denoted by the same reference numerals, and repeated explanations thereof will be omitted.

Giant. Fig. 19 to Fig. 22 show step by step the method of manufacturing the electric motor stator according to the fourth exemplary embodiment.

Giant. 19 shows a method of mounting insulators on a split stator iron core.

Giant. 20 shows a method of temporarily holding an insulating strip in the form of a foil by means of the holding teeth of the respective insulators.

Giant. 21 shows a method of winding a coil around a split stator iron core by means of insulators and a foil-shaped insulating strip.

- 21 CZ 309600 B6

Giant. 22 shows the cutting of the respective teeth from the respective insulators.

As shown in Fig. 19, in the insulator 7f according to the fourth exemplary embodiment, the teeth 15e on the outer side are arranged on the outer wall, and the teeth 16e on the inner side are arranged on the inner wall.

The free tooth space is not arranged at the base of each of the teeth 15e on the outer side and the teeth 16e on the inner side.

On both side end surfaces of the outer wall and on both side end surfaces of the inner wall of the insulator 7f in its circumferential direction, areas except for the vicinity of the retaining teeth are formed flat.

In the state where the insulators 7f are attached to both end surfaces of the split stator iron core 6, the teeth 15e on the outside are positioned so as to project outward from the side ends of the rear yoke 9 of the split stator iron core 6 in its circumferential direction, with the teeth 16e on on the inner side, they are located so as to protrude outward from the side end of the front ends of the teeth of the divided stator iron core 6 in its circumferential direction.

Giant. 20 shows a state where the foil-shaped insulating strip 8 is attached to the split stator iron core 6 and the insulators 7f of Fig. 19.

The respective outer peripheral side ends 8a of the foil-shaped insulating strip 8 are pierced and temporarily held by the teeth 15e on the outer side.

In addition, the respective inner peripheral side ends 8b of the foil-shaped insulating strip 8 are pierced and temporarily held by the teeth 16e on the inner side and the respective ends of the split stator iron core 6.

The foil-shaped insulating strip 8 is arranged to be larger than the divided stator iron core 6 in terms of width in the direction of the axis of rotation of the stator, especially in the vertical direction as shown in Fig. 20.

The foil-shaped insulating strip 8 is arranged so that there is an overlap between the strip and the insulators 7f through the overlaps 19.

Giant. 19 and Fig. 20 show that the foil-shaped insulating strip 8 is attached after the insulator 7f is attached to the split stator iron core 6.

However, the order of attachment is not limited. The insulators 7f can also be attached after bringing the foil-shaped insulating strip 8 into close contact with the split stator iron core 6.

The foil-shaped insulating strip 8, bent after alignment with the points of intersection in the groove of the split stator iron core 6, is brought into close contact with the split stator iron core 6.

Further, the insulators 7f are attached to the split stator iron core 6 from both axial ends thereof in such a way that the outer peripheral side ends 8a are inserted into the clearance between the side ends of the rear yoke 9 of the split stator iron core 6 and the respective teeth 15e on the outer side, while the inner the peripheral side ends 8b are inserted into the clearance between the side ends of the front end 11 of the tooth 10 and the respective teeth 16e on the inner side.

Giant. 21 shows a split core where a coil 18 is wound around a split stator iron core 6 by means of an insulator 7f and a foil-shaped insulating strip 8 as shown in Fig. 20.

The outer peripheral side ends 8a and the inner peripheral side ends 8b protrude outward from the coil 18,

- 22 CZ 309600 B6 of the respective side ends of the rear yoke 9 of the split stator iron core 6 and the respective side ends of the front end 11 of the tooth 10.

Giant. 22 shows a split core where the teeth 15e on the outside and the teeth 16e on the inside are cut from the respective peripheral side ends of the outer wall 12 and the respective peripheral side ends of the inner wall 14 of the insulators 7f of the split core of Fig. 20, with the outer peripheral side ends 8a are bent inward with respect to the radial direction, while the inner peripheral side ends 8b are bent outward with respect to the radial direction.

Since the outer peripheral side ends 8a and the inner peripheral side ends 8b are bent through the clearance between the coil 18 and the split stator iron core 6, the foil-shaped insulating strip covers the coil 18 from the respective side ends of the rear yoke 9 to the respective side ends of the front ends 11 tooth 10.

A predetermined number of split cores as shown in Fig. 22 are brought into close contact with the respective side ends of the rear stirrups 9 to arrange in an annular pattern. The stator of the electric motor is thus assembled.

According to Fig. 22, the surplus inner peripheral side ends 8b and the surplus outer peripheral side ends 8a of the foil-shaped insulating strip 8 face each other so as to cover the coil 18 through the edges of the surpluses. These excesses thus double the insulator between adjacent coils.

However, there is also a case where the length of the excesses of the inner peripheral side ends 8b and the length of the excesses of the outer peripheral side ends 8a are set to the minimum length of the edge surface.

Giant. 23 shows an exemplary assembly where the length of the inner peripheral side end 8b of the foil-shaped insulating strip 8 is set so that the end does not protrude from the inner peripheral surface 11a of the front end 11 of the tooth 10, and only the outer peripheral side ends 8a are bent towards the side of the inner diameter relative to the radial direction.

The serrations 15e on the outer side are arranged on the outer wall 12 of the insulator 7f, while the serrations 16e on the inner side are arranged on the inner wall 13 of the insulator 7f.

The essential requirement is that the foil-shaped insulating strip 8 can only be attached by means of either the teeth 15e on the outside or the teeth 16e on the inside.

It is therefore also possible to arrange a structure in which only the teeth 15e on the outside are arranged on the outer wall 12, or only the teeth 16e on the inside are arranged on the inner wall 13.

As already mentioned above, the teeth 15e on the outer side and the teeth 16e on the inner side are arranged on the respective insulators 7f of the electric motor stators according to the fourth exemplary embodiment.

However, after winding the coil, the coil holds the insulating strip 8 in the form of a foil, which further eliminates the need for the arrangement of holding teeth.

Thus, the stator of the electric motor can be assembled by cutting off the retaining teeth and arranging the split cores in a ring pattern without ensuring contact between the retaining teeth.

In addition, the elimination of the holding teeth eliminates the need to arrange the free spaces of the teeth, as a result of which the cost of machining the insulators 7f can be reduced.

Fifth exemplary embodiment

- 23 CZ 309600 B6

In the fifth exemplary embodiment, a method of mounting the stator by attaching one foil-shaped insulating strip 8 over the teeth of a plurality of divided stator iron cores will be explained with reference to Fig. 24A, Fig. 24B, and Fig. 24C.

Giant. 24A shows a cross-sectional view of the center of the bonded split stator iron core 30, wherein a foil-shaped insulating strip is attached to the bonded split stator iron core 30, comprising a plurality of split stator iron cores 30 connected by the thin wall portions 31 of FIG. 10, wherein the coil 18 is wound around each of the teeth 10 of the connected split stator iron core 30.

Giant. 24B is a cross-sectional view showing the cut-out state of the foil-shaped insulating strip 8.

Giant. 24C is an oblique perspective view showing that the cut-out portions 35 of the foil-shaped insulating strip 8 are bent toward the rear yoke 9.

As shown in Fig. 24A , one foil-shaped insulating strip 8 is arranged over the connected split stator iron core 30 so as to extend over the plurality of teeth 10 of the connected split stator iron core 30 .

Further, insulators having retaining teeth are attached to both end surfaces of the respective connected split stator iron core 30 from the upper side and the lower side in the axial direction, thereby attaching the foil-shaped insulating strip 8.

The coil 18 is wound around each of the teeth 10 by means of the insulating strip 8 in the form of a foil thus attached.

As shown in Fig. 24B, the foil-shaped insulating strip 8 is cut along the cut portions 35 in the vicinity of the inner peripheral surface 11a of the front end of the tooth.

Giant. 24B shows a state where one foil-shaped insulating strip 8 is cut into three parts by two cut-out parts 35.

As shown in Fig. 24C, the cut ends of the cut portions 35 of the foil-shaped insulating strip 8 are folded toward the rear yoke 9 along the return portions 36 located near the inside of the front end 11 of the tooth 10.

Finally, the thin wall portions 31 are folded over to form the connected split stator iron core 30 into an annular shape. The stators are thus completed.

As mentioned above, the coils 18 are surrounded by a folded foil-shaped insulating strip by folding the thus cut foil-shaped insulating strip 8, as a result of which the insulation between adjacent coils 18 can be maintained.

In the fifth exemplary embodiment, one foil-shaped insulating strip 8 may also be attached so as to pass over all the teeth 10 of the connected split stator iron core 30, or a plurality of foil-shaped insulating strips may also be used.

Two to four insulating strips 8 in the form of foil can for example be used for twelve teeth 10.

Although the explanation has been made through the use of the bonded split stator iron core 30 having thin wall portions 31 in the fifth exemplary embodiment, the joints 33 may also be utilized instead of the thin wall portions 31.

In addition, a set of split stator iron cores 6 can also be used instead

- 24 CZ 309600 B6 split stator iron core 30.

As already mentioned above, in the fifth exemplary embodiment, the set of teeth 10 and coils 18 can be insulated from each other by using one insulating strip 8 in the form of a foil. The productivity of the stators can thus be increased.

In addition, the insulation between the coils 18 adjacent to the folded foil-shaped insulating strip 8 is improved, as a result of which the electric motor can be improved in terms of stator reliability.

Sixth exemplary embodiment

In the sixth exemplary embodiment, an explanation will be given of a compressor having an electric motor provided with a stator described in any of the first to fifth exemplary embodiments.

Giant. 25 shows a sectional view of a compressor according to a sixth exemplary embodiment.

The compressor will now be further described.

In the case of the compressor, the electric motor 1 is housed in a sealed container 41. The container 41 comprises a deep barrel having an open end face and a cover closing the open end face.

The stators 3 are attached to the inner peripheral surface of the barrel of the sealed container 41, the rotor 2 being located with a nominal clearance between the rotor and the inside of the inner peripheral surfaces 11 and the front ends of the teeth of the stators 3.

The stators 3 are attached by means of spot welding or heat sealing of the radial outer side surfaces of the respective split stator iron cores 6 to the barrel of the sealed container 41.

The coils 18 of the respective stators 3 are connected to a terminal 42 attached to the center of the cover of the sealed container 41 by means of conductors 43, and electrical energy is supplied to the stators 3 from the terminal 42.

The crankshaft 4 is supported and fixed to the center of the rotor 2, and the eccentric part 44 protruding from the rotor 2 is fixed to the crankshaft 4.

An eccentric part 44 is stored in the inner space of the cylinder 45. The inner space of the cylinder 45 and the roller 46, attached to the eccentric part 44, form a compression chamber for compressing the coolant.

Vane 47, which separates the high-pressure side from the low-pressure side, is fixed in the compression chamber.

An upper bearing 48 and a lower bearing 49 for supporting the crankshaft 4 are arranged on the upper and lower sides of the cylinder 45.

The compressor is connected to the evaporator of the refrigeration cycle through the refrigerant inlet pipe 50 arranged in the barrel of the sealed container 41 and also to the condenser of the refrigeration cycle through the refrigerant outlet pipe 51 arranged in the cover of the sealed container 41.

The functions and operation of the compressor will now be further described.

If electrical power is supplied to the stators 3 through the terminal 42, then the crankshaft 4, attached to the rotor 2, rotates about the axis of rotation, as a result of which the refrigerant is supplied to the compression chamber from the refrigeration cycle through the refrigerant inlet pipe 50 and is

- 25 CZ 309600 B6 compressed through the eccentric movement of the roller 46.

The compressed refrigerant under high pressure is forced into the sealed container 41 from the compression chamber, resulting in a high pressure condition inside the sealed container 41.

The highly compressed refrigerant in the sealed container 41 is forced into the refrigeration cycle from the refrigerant outlet pipe 51.

Although the rotary compressor is shown in Fig. 25 and has been described in connection with the sixth exemplary embodiment, the electric motor can also be applied to the screw compressor and the vane compressor in the same way.

As already mentioned above, in the sixth exemplary embodiment, the holding teeth for temporarily holding the ends of the foil-shaped insulating strip for insulating the coils wound around the respective stators from the split stator iron cores are located outside the range of the grooves around which the coils are wound.

Thus, a compressor can be arranged which is provided with stators containing large effective areas of the grooves around which the coils are wound and which exhibits high operating efficiency.

In addition, an adhesive tape or the like that represents an additional material is not required to attach the foil-shaped insulating strip.

Thus, if the electric motor is mounted in a coolant, i.e. in the atmosphere of a cooling device or the like, then clogging of the cooling cycle, which could otherwise occur through oligomer extraction, is prevented.

Therefore, a highly reliable compressor can be realized, which is characterized by compressing the refrigerant.

Industrial applicability

The present invention can be used for electric motors having stators in which the coils are wound around insulating members arranged on the end faces of the set of teeth. The electric motor can be used for various devices, including the compressor.

Claims (8)

1. Electric motor (1), containing: a rotor (2) rotatable about an axis (4a) of rotation, a plurality of split iron cores (6) arranged in an annular pattern to surround the rotor (2), each of the plurality of split iron cores (6) comprising: a rear yoke (9 ), and a tooth extending from the rear yoke (9) toward the rotor (2), an insulating strip (8) attached to each of the plurality of split iron cores (6), an insulator (7) attached to the end surface of each of the plurality of split iron cores (6), each end surface being substantially perpendicular to the axis (4a) of rotation of the rotor (2), each insulator (7) comprising: a cover (14) of the tooth for covering the end surface of the tooth of one of the plurality of divided iron cores (6), an inner wall (13) arranged on the inner peripheral side of the cover (14) of the tooth, an outer wall (12) arranged on the outer peripheral side of the cover ( 14) tooth and attached to the end surface of the rear yoke (9), and the holding part (15, 16) for holding the insulating strip (8) on the end part in the circumferential direction of the divided iron core (6) of at least one outer wall (12) or inner walls (13), and a coil (18) wound around each of a plurality of split iron cores (6) with at least one tooth cover (14) and an insulating strip (8) between them, characterized in that the holding portion (15, 16 ) is a retaining tooth which is arranged on the end surface of at least one outer wall (12) or inner wall (13) in their circumferential direction and protrudes in the circumferential direction. 2. Electric motor (1) according to claim 1, characterized in that the width of the divided iron core (6) in its circumferential direction is greater than the width of the insulator (7) in its circumferential direction. 3. The electric motor (1) according to claim 1, characterized in that the free space of the tooth, having a recessed shape or a cut-out shape, is arranged at the foot of the retaining tooth on the outer wall (12) or the inner wall (13) of each insulator (7), and wherein the retaining tooth of each insulator (7) is placed in the free space of the tooth of the adjacent insulator (7). 4. The electric motor (1) according to any one of claims 1 to 3, characterized in that the rear yoke (9) of at least one of the set of divided iron cores (6) is connected together by means of a connecting part arranged at the end of the rear yoke (9) of one another of the set of split iron cores (6) which is adjacent to at least one of the set of split iron cores (6). 5. Electric motor (1) according to claim 4, characterized in that the connecting part is a bent thin-walled part which is formed integrally with the adjacent split iron core (6). 6. Electric motor (1) according to claim 4, characterized in that the connecting part is a connecting part that is rotatable. 7. Method of manufacturing an electric motor, containing: a rotor (2) rotatable about an axis (4a) of rotation, a plurality of split iron cores (6) arranged in an annular pattern so as to surround the rotor (2), each of the plurality of split iron cores (6) comprising: a rear yoke (9), and a tooth extending from the rear yoke (9) toward the rotor (2), an insulating strip (8) attached to each of the plurality of split iron cores (6), an insulator (7) attached to the end face of each of sets of split iron cores (6), - 27 CZ 309600 B6 wherein each end surface is substantially perpendicular to the axis (4a) of rotation of the rotor (2), wherein each insulator {7} contains: a cover (14) of the tooth for covering the end surface of the tooth of one of the plurality of divided iron cores (6), an inner wall (13) arranged on the inner peripheral side of the cover (14) of the tooth, an outer wall (12) arranged on the outer peripheral side of the cover ( 14) tooth and attached to the end surface of the rear yoke (9), and the holding part (15, 16) for holding the insulating strip (8) on the end part in the circumferential direction of the divided iron core (6) of at least one outer wall (12) or inner walls (13), and a coil (18) wound around each of a plurality of split iron cores (6) with at least one tooth cover (14) and an insulating strip (8) between them, characterized in that the holding portion (15, 16 ) is a retaining tooth that is arranged on the end surface of at least one outer wall (12) or inner wall (13) in their circumferential direction and protrudes in the circumferential direction, wherein the method includes: attaching the insulating strip (8) with each retaining tooth, winding the coil (18) around each tooth with at least one tooth cover (14) and the insulating strip (8) therebetween, and cutting each retaining tooth from each insulator (7). 8. A method of manufacturing an electric motor, comprising: a rotor (2) rotatable around an axis (4a) of rotation, a set of split iron cores (6) which are arranged in an annular pattern to surround the rotor (2), each of the set of split iron cores (6) core (6) includes: a rear yoke (9), and a tooth extending from the rear yoke (9) toward the rotor (2), an insulating strip (8) attached to each of a plurality of split iron cores (6), an insulator (7 ), attached to an end surface of each of a plurality of split iron cores (6), each end surface being substantially perpendicular to the axis (4a) of rotation of the rotor (2), each insulator (7) comprising: a cover (14) of the tooth for covering the end surface of the tooth of one of the plurality of divided iron cores (6), an inner wall (13) arranged on the inner peripheral side of the cover (14) of the tooth, an outer wall (12) arranged on the outer peripheral side of the cover ( 14) tooth and attached to the end surface of the rear yoke (9), and the holding part (15, 16) for holding the insulating strip (8) on the end part in the circumferential direction of the divided iron core (6) of at least one outer wall (12) or inner walls (13), and a coil (18) wound around each of a plurality of split iron cores (6) with at least one tooth cover (14) and an insulating strip (8) between them, characterized in that the method comprises: fixing the part of the insulating strip (8) by means of retaining teeth arranged at both ends of each inner wall (13) so that the part of the insulating strip (8) covers each inner peripheral surface in the radial direction of each tooth by passing through a plurality of divided iron cores ( 6), winding the coil (18) around each tooth with at least one tooth cover (14) and an insulating strip (8) therebetween, cutting off a portion of the insulating strip (8) at each cutting position which is an internal position relative to each tooth in the radial direction, to form each cut-out portion, and folding each cut-out portion of the insulating strip (8) on the outside in the radial direction to cover each coil (18) with the insulating strip (8).