JP7007634B2 - Motor stator core - Google Patents

Description

The present invention relates to a motor stator core.

For example, as described in Patent Document 1 below, motor stators are known. In general, a conventional motor stator includes a motor stator core, insulating paper, and a coil (coil corresponding to U phase, V phase, and W phase, respectively). The motor stator core has a cylindrical yoke portion and a plurality of teeth portions protruding inward from the inner peripheral surface of the yoke portion. Each tooth portion extends parallel to the central axis direction of the yoke portion. A plurality of tooth portions are arranged at equal intervals in the circumferential direction of the yoke portion. The motor stator core is formed by laminating electromagnetic steel sheets. Insulating paper is inserted into each slot portion formed between two adjacent tooth portions. The insulating paper is formed in a groove shape extending in the direction of the central axis of the motor stator core so as to be along the inner peripheral surface of the slot portion. Both ends of the insulating paper in the extending direction protrude from both ends of the motor stator core in the extending direction. The inner peripheral surface of the slot portion is electrically insulated and coated with this insulating paper.

A coil is mounted on the inner peripheral portion of the motor stator core configured as described above. The direction of the center axis of the coil coincides with the radial direction of the motor stator core. The coil is preformed into a substantially rectangular shape extending in the direction of the central axis of the motor stator core. The dimensions of the long side of the coil are equivalent to the dimensions of the insulating paper in the longitudinal direction. On the other hand, the dimension of the short side portion of the coil is equivalent to the distance between the slot portions at both ends of the plurality of (for example, five) slot portions adjacent to each other in the circumferential direction of the motor stator core. Both long side portions of the coil thus formed are inserted into the slot portions at both ends of the plurality of (for example, five) slot portions. At that time, a synthetic resin cuff (jig) that supports both ends of the insulating paper on both ends of the motor stator core so that the ends of the insulating paper are not bent (or damaged) by both short sides of the coil. ) Is placed. The cuff may be removed after the coil is mounted, or it may remain attached to the motor stator core. That is, the motor stator core may be composed of a main body portion and a cuffer formed by laminating electromagnetic steel sheets as described above.

As described above, both ends of the insulating paper are projected from both ends of the motor stator core (main body), and the coil is mounted while supporting both ends of the insulating paper, whereby the short side of the coil is attached. The distance between the stator core and the end face of the stator core (end face of the tooth portion) is maintained at a predetermined value (for example, 3 mm) or more.

Japanese Unexamined Patent Publication No. 2004-260881

As described above, in the conventional motor stator, the distance between the end face (end face of the tooth portion) of the motor stator core (main body portion) and the short side portion of the coil is secured to a predetermined value or more, and electrical insulation between the two is ensured. I have secured it. In this case, of the space inside the coil, the space between the end surface (end surface of the teeth portion) of the motor stator core (main body portion) and the short side portion of the coil is magnetically wasted space. That is, in the space inside the coil, only the teeth portion functions as an iron core for increasing the magnetic flux density in the coil. Therefore, when the above-mentioned conventional motor stator is used, it is difficult to improve the output of the motor or reduce the size of the motor. Further, since the distance between the end surface (end surface of the teeth portion) of the motor stator core (main body portion) and the short side portion of the coil is secured to a predetermined value or more, the coil diameter (dimension of the long side portion) becomes unnecessarily large. Therefore, the circumference of the coil is long and the electric resistance is large. Therefore, the output efficiency of the motor is lowered.

The present invention has been made to address the above problems, and an object of the present invention is to provide a motor stator core capable of improving or reducing the output of a motor. In the following description of each component of the present invention, in order to facilitate understanding of the present invention, the reference numerals of the corresponding parts of the embodiments are described in parentheses, but each component of the present invention is described. It should not be construed as limited to the configuration of the corresponding parts indicated by the reference numerals of the embodiments.

In order to achieve the above object, the feature of the present invention is to project inward from the annular base (111a) and the inner peripheral surface of the base, and to project a plurality of protrusions arranged at equal intervals along the circumferential direction of the base. A first yoke portion formed by stacking a plurality of substrates (111) made of a magnetic material, each comprising a portion (111b), and the base portions of the plurality of substrates are overlapped with each other. (Y1), a main body portion having a plurality of first teeth portions (T1) formed by overlapping the protruding portions of the plurality of substrates, and an end face of the main body portion, in which the plurality of substrates are laminated. A cuffer (12) attached to at least one end surface in the direction and formed in an annular shape from a second yoke portion (Y2) attached to the first yoke portion and an inner peripheral surface of the second yoke portion. A molded or sintered body made of a powdery soft magnetic material , comprising a plurality of second tooth portions (T2) each protruding inward and attached to the plurality of first tooth portions. The motor stator core (10) is provided with a cuff that is integrally formed and whose surface is electrically insulated and coated.

In this case, it is preferable that chamfering or rounding is formed in the ridgeline portion (Pa) of the second tooth portion where the coil (30) of the motor stator (1) to which the motor stator core is applied abuts. ..

Of the space inside the coil of the motor stator to which the motor stator core according to the present invention is applied, the portion occupied by the first teeth portion corresponds to the portion occupied by the teeth portion in the conventional motor stator. Further, in the space inside the coil, the portion occupied by the second tooth portion is a portion that was a cavity for ensuring the distance between the coil and the end face of the tooth portion in the conventional motor stator, or is made of synthetic resin. It corresponds to the part occupied by the cuff. In the motor stator core according to the present invention, the cuff is made of a soft magnetic material. Therefore, in the space inside the coil, not only the portion occupied by the first teeth portion but also the portion occupied by the second teeth portion functions as an iron core. As described above, the portion occupied by the second teeth portion is a portion that does not function as an iron core in the conventional motor stator. Therefore, by using the motor stator core of the present invention, it is possible to realize a motor having a higher output than the conventional motor configured by using the conventional motor stator core. Further, by using the motor stator core of the present invention, it is possible to realize a motor having the same output as the above-mentioned conventional motor and smaller than the above-mentioned conventional motor. In this case, since the circumference of the coil can be set shorter than before, the electrical resistance of the coil is small. Therefore, the output efficiency of the motor can be improved.

It is an exploded perspective view of the motor stator which concerns on one Embodiment of this invention. It is a perspective view of a substrate. It is an enlarged perspective view which enlarged a part of a substrate. It is a perspective view of a main body part. It is an enlarged perspective view which enlarged a part of the main body part. It is a perspective view of a cuff. It is an enlarged view of the surface side of a cuff. It is an enlarged view of the back side of a cuff. It is a perspective view of the insulating paper. It is a perspective view which shows the attachment procedure of the insulating paper. It is a perspective view which shows the state which the insulating paper was inserted into the 1st slot part of the main body part. It is an enlarged view of a part of the main body part to which a cuff is attached. It is a perspective view which shows the mounting procedure of a coil. It is a perspective view of the cuffs which concerns on the modification of this invention.

Hereinafter, the motor stator 1 to which the motor stator core 10 according to the embodiment of the present invention is applied will be described. As shown in FIG. 1, the motor stator 1 includes a motor stator core 10 and a plurality of insulating papers 20. Further, the motor stator 1 includes a plurality of coils 30 (see FIG. 13).

The motor stator core 10 includes a main body portion 11 and a pair of cuffs 12, 12. The main body 11 is formed by laminating an annular substrate 111 (see FIG. 2) made of an electromagnetic steel plate. The substrate 111 is formed by punching an electromagnetic steel sheet. The substrate 111 has a base 111a and a plurality of protrusions 111b. The base 111a is formed in an annular shape. Each protrusion 111b extends from the inner peripheral surface of the base 111a toward the center of the base 111a. A plurality of protruding portions 111b are arranged at equal intervals in the circumferential direction of the base portion 111a. The width WT1 of the protrusion _111b (dimensions in the direction perpendicular to the extension direction of the protrusion 111b and perpendicular to the plate thickness direction of the substrate 111) is constant regardless of the position of the protrusion 111b in the extension direction (FIG. FIG. 3). Convex portions P _111b and P _111b are formed at the tip of the protruding portion 111b. The convex portions P _111b and P _111b project from both end faces in the width direction of the tip portion of the protruding portion 111b in the width direction of the protruding portion 111b, respectively.

The side peripheral surface of the substrate 111 is electrically insulated. As shown in FIG. 4, the substrates 111 configured as described above are laminated to form the main body portion 11. Hereinafter, the portion of the main body portion 11 formed by laminating the base portion 111a of each substrate 111 is referred to as a first yoke portion Y1. Further, a portion of the main body portion 11 formed by laminating each protruding portion 111b of each substrate 111 is referred to as a first teeth portion T1. Further, as shown in FIG. 5, the portions formed by laminating the convex portions P _111b and P _111b of each substrate 111 are referred to as the first flange portions F1 and F1. Further, the space formed between the two first teeth portions T1 adjacent to each other in the circumferential direction of the main body portion 11 is referred to as a first slot portion SL1.

The cuffs 12 are integrally formed by using a soft magnetic material (for example, ferrite). For example, the cuffs 12 are manufactured by molding and sintering a powdery soft magnetic material. As shown in FIG. 6, the cuffs 12 are formed in a substantially disk shape. The dimension in the thickness direction of the cuffs 12 (the direction of the central axis of the cuffs 12) is smaller than the dimension in the direction of the central axis of the main body 11. The cuffs 12 have a second yoke portion Y2 and a plurality of second teeth portions T2. The second yoke portion Y2 is formed in an annular shape.

Each second teeth portion T2 corresponds to each first teeth portion T1. Each second tooth portion T2 is a prismatic portion extending from the inner peripheral surface of the second yoke portion Y2 toward the center of the second yoke portion Y2. A cross section of the first teeth portion T1 that is perpendicular to the central axis direction of the main body portion 11 and a cross section of the second teeth portion T2 that is perpendicular to the central axis direction (thickness direction) of the cuffs 12. The shape of the cross section is the same. That is, the dimension LT2 in the extension direction of the second teeth portion _T2 is the same as the dimension LT1 in the extension direction of the first teeth portion _T1 (see FIGS. 5 and 7). Further, the width WT2 of the second teeth portion _T2 (dimensions perpendicular to the radial direction of the cuffs 12 and perpendicular to the thickness direction of the cuffs 12) is the same as the width WT1 of the first teeth portion _T1 (FIG. 5 and FIG. 7). The width WT2 of the second teeth portion _T2 is constant regardless of the position of the second teeth portion T2 in the extending direction. Flange portions F2 and F2 similar to the flange portions F1 and F1 are formed at the tip end portion of the second teeth portion T2. Hereinafter, the space formed between the two second teeth portions T2 adjacent to each other in the circumferential direction of the cuffs 12 is referred to as a second slot portion SL2.

A chamfer or roundness is formed on the ridgeline portion Pa where one surface S _12a in the thickness direction of the cuffer 12 intersects with the inner peripheral surface of the second slot portion SL2 (see FIG. 7). However, chamfering and roundness are not formed on the ridges of the flanges F2 and F2. Further, no chamfering or rounding is formed on the ridgeline portion Pb where the other surface S _12b in the thickness direction of the cuffer 12 intersects with the inner peripheral surface of the second slot portion SL2 (see FIG. 11). The entire surface of the cuffs 12 is covered with an electric insulating material (for example, a polyamide-imide resin material).

As shown in FIG. 9, the insulating paper 20 extends in parallel with the central axis direction of the main body 11 (the stacking direction of the substrate 111). The insulating paper 20 is formed on the surface of the first slot portion SL1 (the two second of the side surfaces SS _T1 , SS _T1 and the yoke portion Y1 of the two first tooth portions T1 adjacent to each other in the circumferential direction of the main body portion 11 facing each other. 1 It is molded so as to exhibit a groove shape along the inner peripheral surface _SSY1 (see FIG. 10) of the portion located between the teeth portions T1. Both ends 21 and 21 (upper end and lower end in FIG. 9) of the insulating paper 20 in the extending direction are folded outward and doubled.

The coil 30 is preformed into a substantially rectangular shape extending in the central axis direction of the main body portion 11 like the coil of the conventional motor stator. The dimensions of the coil 30 in the longitudinal direction are equivalent to the dimensions of the teeth portion T in the longitudinal direction (direction parallel to the central axis direction of the main body portion 11 and the cuffs 12, 12). On the other hand, the dimension of the coil 30 in the short side direction is equivalent to the distance between the slot portions SL, SL at both ends of the plurality of (for example, five) slot portions SL adjacent to each other.

The motor stator 1 is assembled as follows. First, as shown in FIG. 10, each insulating paper 20 is inserted into the first slot portion SL1. The surface (side surface SS _T1 , SS _T1 , and inner peripheral surface SS _Y1 ) of the first slot portion SL1 is electrically insulated and coated by the intermediate portion 22 excluding both end portions 21 and 21 in the extending direction of the insulating paper 20. .. When the insulating paper 20 is inserted into the first slot portion SL1, both end portions 21 and 21 of the insulating paper 20 project from both end faces S ₁₁ and S ₁₁ in the central axis direction of the main body portion 11 (see FIG. 11). ).

Next, the surfaces S _12b and S _12b of the cuffs 12 and 12 are brought into contact with both end faces S ₁₁ and S ₁₁ in the central axis direction of the main body 11, respectively, and the cuffs 12 and 12 are fixed to the main body 11 ( See FIG. 11). At that time, as shown in FIG. 12, the second yoke portion Y2 is superposed on the first yoke portion Y1, and each second tooth portion T2 is superposed on each first teeth portion T1. The first slot portion SL1 and the second slot portions SL2 and SL2 are continuous without forming a large step at their boundary. Hereinafter, a portion including the first slot portion SL1 and the second slot portions SL2 and SL2 arranged at both ends thereof is referred to as a slot portion SL. Further, a portion composed of the first teeth portion T1 and the second teeth portions T2 and T2 arranged at both ends thereof is referred to as a teeth portion T. Although the insulating paper 20 is omitted in FIG. 12, the boundary portion between the first slot portion SL1 and the second slot portions SL2 and SL2 is covered with the insulating paper 20.

Further, both end portions 21 and 21 of the insulating paper 20 are supported on the inner peripheral surface of the second slot portions SL2 of the cuffs 12 and 12.

Next, both long sides of the coil 30 are inserted into the slot portions SL, SL at both ends of the plurality of (for example, five) slot portions SL (see FIG. 13). That is, the electric wire constituting the coil 30 is wound around a portion of the plurality (for example, 5) slot portions SL located between the slot portions SL, SL at both ends. The surface of the electric wire constituting the coil 30 is covered with an electric insulating material. Further, the coils 30 corresponding to the U phase, the V phase, and the W phase are mounted in a state of being displaced from each other in the circumferential direction of the main body portion 11 and the cuffs 12, 12. Since the cuffs 12 are covered with the electric insulating material as described above, a sufficient creepage distance is secured between the end surface S ₁₁ of the main body portion 11 and the short side portion of the coil 30. In this way, the motor stator 1 is assembled.

Of the space inside the coil 30 of the motor stator 1 configured as described above, the portion occupied by the first teeth portion T1 corresponds to the portion occupied by the teeth portion in the conventional motor stator. Further, in the space inside the coil 30, the portion occupied by the second teeth portion T2 is a hollow portion or a composite for securing the distance between the coil and the end face of the teeth portion in the conventional motor stator. It corresponds to the part occupied by the resin cuff. As described above, in the present embodiment, the cuffs 12 and 12 are made of a soft magnetic material. Therefore, in the space inside the coil 30, not only the portion occupied by the first teeth portion T1 but also the portion occupied by the second teeth portion T2 functions as an iron core. As described above, the portion occupied by the second teeth portion T2 is a portion that does not function as an iron core in the conventional motor stator. Therefore, if the motor stator core 10 is used, it is possible to realize a motor having a higher output than the conventional motor configured by using the conventional motor stator core. Further, if the motor stator core 10 is used, it is possible to realize a motor having the same output as the above-mentioned conventional motor and smaller than the above-mentioned conventional motor. In this case, since the peripheral length of the coil 30 can be set shorter than before, the electrical resistance of the coil 30 is small. Therefore, the output efficiency of the motor can be improved.

Further, a chamfer or a roundness is formed on the ridgeline portion Pa of the cuffer 12. Therefore, when the coil 30 is mounted, the coating material of the electric wire constituting the coil 30 is unlikely to be damaged.

Further, the implementation of the present invention is not limited to the above embodiment, and various changes can be made as long as the object of the present invention is not deviated.

For example, in the above embodiment, the cuffs 12 are integrally formed, but as shown in FIG. 14, the cuffs 12 may be divided. That is, the cuffs 12 may be composed of a plurality of portions each formed in an arc shape. Further, in the above embodiment, the width WT1 of the first teeth portion _T1 is constant regardless of the position of the first teeth portion T1 in the extending direction, and the width WT2 of the second teeth portion _T2 is the second teeth. It is constant regardless of the position of the portion T2 in the extending direction. Instead of this, the width WT1 may be changed according to the position of the first teeth portion _T1 in the extending direction. Further, the width WT2 may be changed according to the position of the second tooth portion _T2 in the extending direction. For example, WT1 may be gradually reduced toward the tip end side of the first teeth portion _T1 . Further, for example, the WT2 may be gradually reduced toward the tip end side of the second tooth portion _T2 .

1 ... Motor stator, 10 ... Motor stator core, 11 ... Main body, 12 ... Cuff flange, 111 ... Board, 20 ... Insulation paper, 21 ... Edge, 22. ... Intermediate part, 30 ... Coil, 111a ... Base part, 111b ... Protruding part, P _111a ... Convex part, F1 ... First flange part, F2 ... Second flange part, Pa ... Ridge line part, Pb ... Ridge line part, SL ... Slot part, SL1 ... 1st slot part, SL2 ... 2nd slot part, T ... Teeth part, T1 ... 1st teeth part, T2 ... 2nd teeth part, Y1 ... 1st yoke part, Y2 ... 2nd yoke part

Claims (2)

A plurality of substrates made of a magnetic material are laminated, each having a ring-shaped base and a plurality of protrusions protruding inward from the inner peripheral surface of the base and arranged at equal intervals along the circumferential direction of the base. A main body having a first yoke portion formed by overlapping the base portions of the plurality of substrates, and a plurality of first teeth portions formed by overlapping the protruding portions of the plurality of substrates. Department and
An end face of the main body, which is a cuff that is attached to at least one end face in the stacking direction of the plurality of substrates and is formed in an annular shape.
The second yoke portion attached to the first yoke portion and
A plurality of second teeth portions protruding inward from the inner peripheral surface of the second yoke portion and attached to the plurality of first teeth portions, respectively.
A cuff that is integrally formed and whose surface is electrically insulated and coated, which is a molded body or a sintered body made of a powdery soft magnetic material .
Equipped with a motor stator core. In the motor stator core according to claim 1,
A motor stator core having a chamfered or rounded portion formed at a portion of the ridgeline portion of the second tooth portion where the coil of the motor stator to which the motor stator core is applied abuts.

Images