JP2010284001A - Stator coil of axial gap type rotating electrical machine - Google Patents

Abstract

An object of the present invention is to provide a stator coil of an axial gap type rotary electric motor excellent in manufacturability while ensuring connection reliability between coil pieces.
A stator coil 10 of an axial gap type rotary electric motor that rotates a rotor, and includes a plurality of coil pieces 11 and a plurality of connection terminals 40 that connect the plurality of coil pieces 11. The upper layer coil piece part 15, the lower layer coil piece part 14 and the locked part 16 are provided, and the upper layer coil piece part 15, the lower layer coil piece part 14 and the locked part 16 are formed by bending one conductor. The connection terminal 40 is formed so as to electrically connect the other end side of the upper layer coil piece part 15 and the other end side of the lower layer call piece part 14 disposed so as to overlap in the rotation axis direction of the rotor. Forming a coil loop.
[Selection] Figure 2

Description

  The present invention relates to a stator coil used in a rotating electric machine, and more particularly to a stator coil of an axial gap type rotating electric machine.

  Conventionally, in the field of axial gap type rotary electric motors, many structures have been proposed for coils (hereinafter referred to as “stator coils”) disposed on a stator (hereinafter referred to as “stator”). For example, according to Patent Document 1 and Patent Document 2, a stator coil is disclosed in which a plurality of coil pieces are joined to form a coil loop.

  Further, regarding the joining of a plurality of coil pieces constituting a stator coil, Patent Document 1 discloses that the coil pieces are joined together by welding the ends of the plurality of coil pieces arranged in the stator. Has been. Also, regarding the welding, it is disclosed that the ends of the coil pieces are welded to each of the outer peripheral edge side and the inner peripheral edge side of the stator.

  Moreover, in patent document 2, the coil pieces are joined by welding the ends of the coil pieces that are clamped and positioned by the clamping jigs, using a clamping jig that clamps the ends of the coil pieces. It is disclosed.

JP 2006-288074 A (see paragraphs 0024 and 0025) Japanese translation of PCT publication No. 2006-502688 (see paragraph 0051 and following)

  However, as disclosed in Patent Literature 1 and Patent Literature 2, the end portions of the coil pieces are sequentially joined to each other on the inner peripheral edge side and the outer peripheral edge side of the stator one by one by welding. This increases the number of processes for manufacturing the film, and consequently increases the cost.

  Further, it is not easy to weld the ends of all the coil pieces under the same welding conditions, and if all the joints of the ends of the plurality of coil pieces are welded, there is a risk of poor connection due to welding defects. There is.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a stator coil of an axial gap type rotary electric motor excellent in manufacturability while ensuring the connection reliability between coil pieces. .

  In order to solve the above-mentioned problem, the invention described in claim 1 is a stator coil provided in a stator of an axial gap type rotary electric motor for rotating a rotor, which is a conductor, and is a base member provided in the stator. A plurality of coil pieces locked at one end side to each other, and a plurality of connection terminals connecting the other end sides of the plurality of coil pieces locked at one end side to the base member, A locked portion positioned on one end side of the coil piece and locked to the base member, and a pair of extending portions extending from one side of the locked portion to the other end side of the coil piece Having an upper layer coil piece portion and a lower layer coil piece portion that are bent so as to open in the circumferential direction of the rotation shaft of the rotor, and the upper layer coil piece portion and the lower layer coil piece The portion has a first bent portion extending from one side of the locked portion, a long intermediate portion having a predetermined angle from the first bent portion, and a predetermined angle from the intermediate portion. The plurality of coil pieces are locked to the base member and arranged in the circumferential direction of the rotation shaft of the rotor, and the rotor The two coil pieces adjacent to each other in the circumferential direction of the rotation axis of the coil piece are the other end side of the upper layer coil piece part of one coil piece and the other end side of the lower layer coil piece part of another coil piece. The rotor is overlapped in the rotation axis direction, and the connection terminal electrically connects the other end side of the upper layer coil piece portion of the one coil piece and the other end side of the lower layer coil piece portion of the other coil piece. To form a coil loop The features.

According to the first aspect of the present invention, a coil piece having an upper layer coil piece portion and a lower layer coil piece portion formed by bending a pair of extended portions extending from the locked portion on one end side. Used. Therefore, it is not necessary to weld the upper layer coil piece part and the lower layer coil piece part on one end side.
Moreover, the connection terminal which connects both is provided in the other end side of the upper layer coil piece part of one coil piece and the lower layer coil piece part of the other coil piece arranged in the circumferential direction of the rotating shaft of the rotor. Therefore, it is not necessary to weld the upper layer coil piece part and the lower layer coil piece part on the other end side.
As described above, according to the present invention, since it is not necessary to weld the coil piece on each of the inner peripheral edge side and the outer peripheral edge side of the stator, an increase in the process of manufacturing the stator coil can be avoided and the cost is increased. Can also be avoided. In addition, poor connection due to welding can be avoided.

  Further, in the stator coil of the axial gap type rotary electric motor according to claim 2, the plurality of coil pieces include a first coil piece and a second coil piece, and the first coil piece includes the upper layer coil piece portion. And a lower end portion of the lower coil piece portion having a joint extending from the end portion of the second bent portion so as to have a predetermined angle, and the second coil piece includes the upper layer coil piece portion or The upper layer coil piece portion or the lower layer coil piece portion has a joint extending at a predetermined angle from the end of the second bent portion on the other end side of either one of the lower layer coil piece portions. A power supply terminal connection portion extending at a predetermined angle from the end portion of the second bent portion is provided on the other other end side.

According to the second aspect of the present invention, the upper end coil piece portion and the lower layer coil piece portion of the plurality of coil pieces are bent at a predetermined angle from the end portion of the second bent portion. And a joint portion extending in the direction. Here, the predetermined angle is an angle at which the joint portion orients the radial direction of the rotating shaft of the rotor when the plurality of coil pieces are arranged in the circumferential direction of the rotating shaft of the rotor. That is, the joints are arranged so as to be arranged at every n / 360 ° angle.
Therefore, the joint extending from the end of the second bent portion of the upper layer coil piece portion and the joint extending from the end of the second bent portion of the lower coil piece portion are around the rotation axis of the rotor. It becomes parallel on the radial line to. Therefore, the connection terminal which electrically connects the joint part of the upper layer coil piece part and the joint part of the lower layer coil piece part can be made into an easy structure.
According to the invention described in claim 2, since the coil piece forming the coil loop has the second coil piece having the power supply terminal connection portion, the power supply terminal connection portion connected to the bus bar is welded to the coil piece. There is no need to install it.

  The stator coil of the axial gap type rotary electric motor according to claim 3, wherein the connection terminal extends in a rotation axis direction of the rotor, and the upper layer coil piece portion of the one coil piece is on one end surface side. A conductive material connecting member that abuts the other end side of the other coil piece and the other end side of the lower coil piece portion of the other coil piece, and an insulating member of a nonconductive material interposed on the other end surface side of the connecting member, It is characterized by having.

According to the invention described in claim 3, since the connection terminal has the connection member made of the conductive material extending in the rotation axis direction of the rotor, the upper layer coil piece of one coil piece overlapping in the rotation axis direction of the rotor. The other end side of the coil portion can be electrically connected to the other end side of the lower layer coil piece portion of the other coil piece.
Moreover, since the insulating member which consists of nonelectroconductive materials exists in the other end surface side of the connection member which contact | abuts the other end side of the said lower layer coil piece part of a coil piece, the other end side of several adjacent coil pieces Can be separated.

  Further, in the stator coil of the axial gap type rotary electric motor according to claim 4, the connection terminal includes a connection member made of a conductive material having a flat plate shape having a flat surface portion, and the flat surface portion includes the one piece. The other end side of the upper layer coil piece part and the other end side of the lower layer coil piece part of another coil piece are in contact with the other end side of the upper layer coil piece part of the coil piece and the lower layer coil piece part. It is characterized in that the end side is electrically connected.

  According to the invention described in claim 4, the connection terminal is brought into contact with the other end side of the upper coil piece portion and the other end side of the lower coil piece portion by the flat portion which is a flat surface. There is no possibility of poor contact between the other end side of the part and the other end side of the lower layer coil piece part.

  Further, in the stator coil of the axial gap type rotary electric motor according to claim 5, the connection terminal includes a connection member made of a conductive material in which a groove is formed, and an insulation member made of an insulating material having a protrusion. The connecting member is configured to fit the groove portion to the other end side of the upper layer coil piece portion of the one coil piece and the other end side of the lower layer coil piece portion of the other coil piece. The other end side of the upper layer coil piece portion of the coil piece is electrically connected to the other end side of the lower layer coil piece portion of another coil piece.

  According to the fifth aspect of the present invention, the connection terminal is fitted to the groove portion of the connection member at the other end side of the upper layer coil piece portion and the other end side of the lower layer coil piece portion, and the other of the upper layer coil piece portion. Since the end side and the other end side of the lower layer coil piece part are connected, the other end side of the upper layer coil piece part, the other end side of the lower layer coil piece part, and the connection terminal are not separated, and there is no possibility of causing poor contact.

  Further, in the stator coil of the axial gap type rotary electric motor according to claim 6, the connection terminal includes the other end side of the upper layer coil piece portion of the one coil piece and the lower layer coil piece portion of the other coil piece. When the other end side is connected, adjacent connection terminals are pressed in the circumferential direction of the rotating shaft of the rotor.

  According to the invention described in claim 6, the connection terminals have an expansion force in the circumferential direction of the rotation shaft of the rotor. Therefore, the contact pressure of the connection member that connects the other end side of the upper layer coil piece part and the other end side of the lower layer coil piece part can be increased, and the contact area can be ensured and the contact resistance can be reduced.

  As mentioned above, according to this invention, the stator coil of the axial gap type rotary motor excellent in manufacturability can be provided, ensuring the connection reliability of coil pieces.

It is a perspective view which shows the whole stator of the axial gap type rotary electric machine provided with the stator coil in embodiment. FIG. 3 is a cross-sectional view showing a side surface of the stator coil of the axial gap type rotating electrical machine when the stator coil of the axial gap type rotating electrical machine shown in FIG. 1 is cut in the BB line direction. It is a figure which shows the stator coil which comprises U phase among the stator coils in embodiment, A left half part is a top view which shows the stator coil arranged in the reverse direction of the forward direction, and an upper right part is a forward direction It is a top view which shows the stator coil arranged in the 1st round, Comprising: The lower right part is a top view which shows the stator coil arranged for the forward direction 3 rounds. It is a figure which shows the 1st coil piece in embodiment, Comprising: (a) is a perspective view, (b) is a perspective view which shows the shape before a bending process. It is a figure which shows the 2nd coil piece in embodiment, Comprising: (a) is a perspective view, (b) is a perspective view which shows the shape before a bending process. It is a perspective view which shows the stator coil which comprises the U phase in embodiment, Comprising: The stator coil part arranged in the forward direction. FIG. 4 is a perspective view showing a stator coil constituting a U phase in the embodiment, and a stator coil portion arranged on the third forward turn and a stator coil portion arranged on the first reverse turn. It is a state enlarged view which shows the structure of the connection terminal in embodiment. It is a principal part top view which shows the use condition of the connection terminal in embodiment. It is a principal part disassembled perspective view which shows the connection terminal in other embodiment. It is a principal part disassembled perspective view which shows the connection terminal in other embodiment. It is a perspective view which shows the 2nd coil piece in other embodiment.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for implementing a stator coil of an axial gap type rotating electrical machine according to the present invention will be described with reference to the drawings.
An unillustrated axial gap type rotating electrical machine is a rotating electrical machine of a type in which a rotor and a stator are arranged opposite to each other in the direction of the rotation axis of the rotor (indicated by the alternate long and short dash line A shown in FIG. 1) and housed in a case. It is a device that converts electrical energy to mechanical energy and performs rotational motion.

Further, the stator 1 of the axial gap type rotating electrical machine shown in FIG. 1 is connected to a bus bar (power supply terminal) (not shown) to rotate the rotor provided with a permanent magnet, and electric energy is input to rotate the rotor. It is a member intended to generate a magnetic field for the purpose.
The permanent magnet provided in the rotor (not shown) is arranged such that the pair of magnetic poles faces the axial direction of the rotation shaft of the rotor, and the N pole and S which are a pair of magnetic poles of adjacent permanent magnets. The poles are disposed so as to be opposite to each other in the circumferential direction of the rotation shaft of the rotor. (That is, the north and south poles are alternately arranged in the circumferential direction when viewed from the plan view).

  As shown in FIGS. 1 and 2, the stator 1 of the axial gap type rotating electrical machine in the embodiment includes a stator coil 10, a base member 50 that supports the inner peripheral side of the stator coil 10, and an outer peripheral side of the stator coil 10. And at least a supporting ring member 60.

A stator coil 10 shown in FIG. 1 is a member that is excited when electric energy is input from a bus bar (power supply terminal) (not shown), and is composed of three phases of a U phase, a V phase, and a W phase.
Hereinafter, among the three phases of the U phase, the V phase, and the W phase constituting the stator coil 10, the stator coil 10a constituting the U phase will be described. Since the other V phase and W phase have the same configuration as the U phase, description thereof is omitted.

Here, the stator coil 10a constituting the U-phase has the object of the present invention that the connection between the coil pieces is highly reliable and the manufacturability is excellent, in addition to the purpose of exciting by receiving electric energy. 2, the plurality of coil pieces 11 that are locked to the base member 50 and are arranged annularly around the rotation axis A of the rotor, as shown in FIG. One coil loop is formed by the connection terminal 40 connected to the.
Note that one coil loop in the U phase formed by a plurality of coil pieces 11 means that, as shown in FIG. 3, the stator coil 10 makes three rounds in the forward direction around the rotation axis A of the rotor ( Refers to the lower right layer in FIG. 3), and refers to a coil loop that is folded back and makes three rounds in the opposite direction (see the left half of FIG. 3).

As shown in FIGS. 4 (a) and 5 (a), the coil piece 11 is disposed at the first coil piece 12 for forming a coil loop and at both ends (starting end, terminal end) of the coil loop, It consists of two types of basic members, the second coil piece 13 for connecting the starting end and the terminal end of different turns, or for connecting to an external power supply terminal.
The first coil piece 12 and the second coil piece 13 constituting the coil piece 11 are members for converting supplied electric energy into magnetic field energy, and therefore are made of a conductive member, and particularly have a resistivity. It is preferably made of low copper, copper alloy, aluminum, or aluminum alloy.

As shown in FIG. 4A, the first coil piece 12 includes a lower layer coil piece portion 14, an upper layer coil piece portion 15, and a locked portion 16.
Here, each component of the lower layer coil piece part 14, the upper layer coil piece part 15, and the locked part 16 has a pair of extending parts 17a and 17a extending in one direction, as shown in FIG. 4B. It is formed by bending a substantially U-shaped conductive plate member 17. As shown in FIG. 2, the pair of extending portions 17 a and 17 a are bent so as to open in the circumferential direction of the rotation axis A of the rotor when the first coil piece 12 is locked to the base member 50. ing. In addition, a gap portion 17b is formed between the pair of extending portions 17a and 17a of the conductive plate member 17 so that the pair of extending portions 17a and 17a do not come into contact with each other.

  And the lower layer coil piece part 14 and the upper layer coil piece part 15 are bent at a predetermined angle from the first bent parts 14b and 15b extending from one side of the locked part 16 and the first bent parts 14b and 15b. The elongated intermediate portions 14a and 15a, the second bent portions 14c and 15c extending from the intermediate portions 14a and 15a so as to have a predetermined angle, and the second bent portions 14c and 15c bent at a predetermined angle. And a joint portion 14d, 15d extending in a predetermined shape.

In addition, as the predetermined shape here is shown in the upper right part of FIG. 3, the 1st coil piece 12 and the 2nd coil piece 13 mentioned later were arranged so that it may make one round in the circumferential direction of the rotating shaft A of a rotor. In this case, it refers to a shape in which the angle formed by the ends of the first coil piece 12 that circulates with respect to the rotation axis A of the rotor is θ ₁ .
Further, this θ ₁ is an angle at which the arrangement is shifted every round as shown in the lower right layer of FIG. 3 when the first coil pieces 12 are arranged so as to circulate in the circumferential direction of the rotation axis A of the rotor. The angle can be changed as appropriate. That is, when the coil loop circulates at least once or more, the n-week end and the n-week start end do not interfere with each other by appropriately adjusting the n-week start end and the n-week end so that the phase is shifted. The end of the nth week and the start of the (n + 1) th week can be connected (n is a natural number).

Here, the predetermined angles of the intermediate portions 14a and 15a, the first bent portions 14b and 15b, and the second bent portions 14c and 15c shown in FIG. 4A are angles that satisfy the following two conditions. Say.
First, as shown in FIG. 2, when the first coil piece 12 is locked to the base member 50 and arranged in the circumferential direction of the rotation axis A of the rotor, the long intermediate portions 14a and 15a are arranged. Is an angle located on the radial line around the rotation axis A of the rotor.
Accordingly, when a current flows through the intermediate portions 14a and 15a, a magnetic field that circulates around the radial line around the rotation axis A of the rotor can be generated.
Second, the angle θ ₂ (see FIG. 2) formed by the intermediate portions 14a and 15a is an angle that matches the phase angle occupied by the permanent magnets arranged in the circumferential direction of the rotor.
Thereby, when the plurality of first coil pieces 12 are arranged in the circumferential direction of the rotation axis A of the rotor, the respective magnetic fields generated from the intermediate portions 14a and 15a of the plurality of first coil pieces 12 are arranged in the rotor. It can correspond to each permanent magnet.

Moreover, as shown to Fig.4 (a), the junction parts 14d and 15d are the members bent and extended so that it may have a predetermined angle from the 2nd bending parts 14c and 15c.
Here, the predetermined angle means that when the first coil piece 12 is locked to the base member 50 and arranged in the circumferential direction of the rotor rotation axis A, the joint portions 14d and 15d are arranged around the rotation axis A of the rotor. It is an angle located on the radial line.
Thus, when the first coil piece 12 is locked to the base member 50 and arranged in the circumferential direction of the rotation axis A of the rotor, the joint portions 14d and 15d of the first coil piece 12 are adjacent to the first coil. There is no possibility of contact between the joining portions 14d and 15d of the piece 12 and the vicinity of the outer peripheral edge of the stator coil 10.

  As shown in FIG. 4A, the locked portion 16 is continuous with one end of the lower layer coil piece portion 14 and the upper layer coil piece portion 15, and the lower layer coil piece portion 14 and the upper layer coil piece. This is a part for electrically connecting the part 15. Further, when the locked portion 16 is arranged around the rotation axis A of the rotor, the locked portion 16 has a shape that can be locked to a locking portion 51 formed on the base member 50 described later.

On the other hand, the 2nd coil piece 13 has the lower layer coil piece part 20, the upper layer coil piece part 21, and the to-be-latched part 22, as shown to Fig.5 (a).
Here, each component of the lower layer coil piece part 20, the upper layer coil piece part 21, and the locked part 22 has a pair of extending parts 18a and 18a extending in one direction, as shown in FIG. 5B. It is formed by bending a substantially U-shaped conductive plate member 18. The pair of extending portions 18 a and 18 a are bent so as to open in the circumferential direction of the rotation axis A of the rotor when the second coil piece 13 is locked to the base member 50.
Further, as shown in FIG. 5B, one of the pair of extending portions 18a, 18a extends in the shorter direction than the other of the pair of extending portions 18a, 18a, and ends in the shorter direction. A round hole 18c is formed on the part side. A gap 18b is formed between the pair of extending portions 18a, 18a of the conductive plate member 18 so that the pair of extending portions 18a, 18a do not come into contact with each other.

  And the lower layer coil piece part 20 and the upper layer coil piece part 21 of the 2nd coil piece 13 bend from one side of the to-be-latched part 22, and 1st bending part 20b, 21b, the 1st bending part 20b, Long intermediate portions 20a, 21a having a predetermined angle from 21b and second bent portions 20c, 21c extending from the intermediate portions 20a, 21a so as to have a predetermined angle are provided. Further, the lower coil piece portion 20 is bent at a predetermined angle from the second bent portion 20c and the power supply terminal connecting portion 20e extends from the second bent portion 21c. The upper coil piece portion 21 is bent at a predetermined angle from the second bent portion 21c. It has a predetermined shape having a joining portion 21d extending in the direction.

In addition, as shown in the upper right part of FIG. 3, the predetermined shape here refers to the case where the first coil piece 12 and the second coil piece 13 are arranged so as to make one turn in the circumferential direction of the rotation axis A of the rotor. It refers to a shape in which the angle formed by the ends of the first coil piece 12 and the second coil piece 13 that have turned around the rotation axis A of the rotor is θ ₁ .
Further, when θ ₁ is arranged so that the first coil piece 12 and the second coil piece 13 circulate in the circumferential direction of the rotation axis A of the rotor, as shown in the lower right part of FIG. This is an angle at which the arrangement is shifted, and an angle that can be changed as appropriate.

Here, the predetermined angles of the intermediate portions 20a and 21a of the second coil piece 13, the first bent portions 20b and 21b, and the second bent portions 20c and 21c are angles satisfying the following two conditions.
First, when the second coil piece 13 is locked to the base member 50 and arranged in the circumferential direction of the rotation axis A of the rotor, the long intermediate portions 20a and 21a have a diameter around the rotation axis of the rotor. An angle located on the line.
Accordingly, when a current flows through the intermediate portions 20a and 21a, a magnetic field that circulates around the radial line around the rotation axis A of the rotor can be generated.
Second, the angle θ (see FIG. 2) formed by the intermediate portions 20a and 21a is an angle that matches the phase angle occupied by the permanent magnets disposed in the circumferential direction of the rotor.
Thereby, the magnetic field generated from each of the intermediate portions 20a and 21a can correspond to each permanent magnet in which the rotor is arranged.

  The joining portion 21d is a portion joined to the connection terminal 40 on the outer peripheral edge side of the stator, and the power supply terminal connection portion 20e is a member for connecting to a bus bar (power supply terminal) (not shown).

  Next, the arrangement of the first coil piece 12 and the second coil piece 13 is opposite to the arrangement performed in the forward direction with respect to the circumferential direction of the rotation axis A of the rotor (hereinafter referred to as “forward arrangement”). The description will be made with reference to FIGS. 3, 6 and 7 by dividing the arrangement in the direction (hereinafter referred to as “reverse arrangement”).

As shown in the upper right part of FIG. 3, the forward direction arrangement is such that the second coil piece 13 is arranged as the starting end of the first round, and the first coil piece is on the forward side of the second coil piece 13 at the starting end. 12 are sequentially arranged.
Further, as shown in the lower right part of FIG. 3, the first coil pieces 12 that are sequentially arranged are arranged so as to make three turns toward the forward direction, and the second coil is used as the end of the third turn. Pieces 13 are arranged (see FIG. 6).

  Here, as shown in FIG. 6, the first coil piece 12 and the second coil piece 13 arranged on the forward direction side are joined portions 15 d of the upper layer coil piece portion 15 and joined portions 14 d of the lower layer coil piece portion 14. Are arranged so as to overlap in the direction of the rotation axis A of the rotor.

Further, since the first coil piece 12 and the second coil piece 13 have a predetermined shape, as shown in the upper right part of FIG. 3 and FIG. 6, the joint part 15 d of the first coil piece 12 at the end of the first round in the forward direction, the feeding terminal connecting portion 20e of the forward first round starting end of the second coil piece 13 are arranged shifted by theta ₁ minute.
That is, as shown in the lower right part of FIG. 3 and FIG. 6, the first coil piece 12 arranged in the second forward turn is the first coil piece 12 and the second coil piece 13 arranged in the first forward turn. And θ ₁ minute.
Similarly, the first coil piece 12 and the second coil piece 13 arranged in the third forward direction are also shifted by θ _{1 from} the first coil piece 12 arranged in the second forward direction. Yes.

As described above, according to the forward sequence described above, as shown in FIG. 3 the right lower and 6, the intermediate portion 14a of the first coil pieces 12, 15a are arranged in three rows in the theta ₁ interval, the coil loop is formed ing. Moreover, if the electric current C is sent from the electric power feeding terminal connection part 20e of the 2nd coil piece 13 which is the start end of the 1st round, it is the middle of the 1st coil piece 12 and the 2nd coil piece 13 which comprise from the 1st to the 3rd round The directions of the currents flowing through the portions 14a, 15a, and 21a are all flowing in the forward direction.

Next, the reverse arrangement will be described.
First, as shown in FIG. 7, the second coil piece 13 having the power supply terminal connecting portion 20 e is arranged as the starting end of the first turn in the reverse direction array. In addition, the first coil pieces 12 are sequentially arranged on the reverse side of the second coil piece 13 at the start of the reverse arrangement.
Moreover, as shown in the left part of FIG. 3, the first coil pieces 12 that are sequentially arranged are arranged so as to make three turns toward the opposite side, and the second coil is used as the end of the third turn. The pieces 13 are arranged (see FIG. 7).

  Also, in the reverse direction arrangement, as in the forward direction arrangement, the first coil piece 12 and the second coil piece 13 arranged on the reverse direction side are joined to the upper coil piece part 15 as shown in FIG. 15d and the joining part 14d of the lower layer coil piece part 14 are arranged so as to overlap in the rotation axis A direction of the rotor.

Therefore, a second revolution first coil pieces 12 in the reverse sequence the second coil piece 13, the first revolution first coil pieces 12 in the reverse sequence, are arranged offset theta ₁ minute Yes. The first coil piece 12 and the second coil pieces 13 are arranged in three round opposite direction, the first offset coil pieces 12 and theta ₁ minute, which is arranged in the second lap opposite direction, and are arranged.

Further, as shown in FIG. 7, the second coil piece 13 at the start of the first turn in the reverse direction array has a second coil piece 13 at the end of the third turn in the forward direction array. The middle part 21a of the second coil piece 13 at the start end is arranged so as to overlap the middle part 20a of the second coil piece 13 at the end of the third turn in the forward direction.
Here, the intermediate portion 21a of the second coil piece 13 at the start end of the first turn in the reverse direction array is arranged so as to overlap with the intermediate portion 20a of the second coil piece 13 at the end of the third turn in the forward direction array. Thus, as shown in FIG. 7, the intermediate portions 14 a and 15 a of the first coil pieces 12 arranged on the reverse direction side of the second coil piece 13 at the start of the first turn in the reverse direction array are arranged in the forward direction array 3. The intermediate portions 14a and 15a of the first coil piece 12 arranged on the opposite side of the second coil piece 13 at the end of the circumference overlap with each other in the rotation axis direction of the rotor.
That is, as shown in FIG. 7, the intermediate portions 14 a, 15 a, and 21 a of the first coil piece 12 and the second coil piece 13 constituting the first turn in the reverse direction array are the first ones constituting the third turn in the forward direction array. The intermediate portions 14a, 15a, and 21a of the coil piece 12 and the second coil piece 13 overlap in the direction of the rotation axis A of the rotor.

As shown in the left part of FIG. 3, the intermediate portions 14 a and 15 a of the first coil pieces 12 arranged in the second turn in the reverse direction array are arranged on the first coil pieces 12 arranged in the second turn in the forward direction array. The intermediate portions 14a and 15a overlap.
Similarly, the intermediate portions 14a, 15a, 21a of the first coil piece 12 and the second coil piece 13 arranged in the third turn of the reverse direction arrangement are the first coils arranged in the first turn of the forward direction arrangement. The intermediate portions 14a, 15a, and 21a of the piece 12 and the second coil piece 13 are overlapped.

  Further, as shown in FIG. 7, the second coil piece 13 at the start of the reverse arrangement is connected to the feeding terminal connection portion 20e of the second coil piece 13 that is the start of the first turn arranged in the reverse direction, and the forward direction. The power supply terminal connection portion 20e of the second coil piece 13 that is the terminal end of the third turn arranged in a short circuit is short-circuited by a short-circuit member (not shown).

As described above, according to the reverse direction arrangement, the middle portions 14a and 15a of the first coil pieces 12 arranged in the reverse direction are arranged in three rows in the circumferential direction at intervals of θ ₁ as in the forward direction. If current is supplied from the feeding terminal connection portion 20e of the second coil piece 13 which is the starting end of the first turn, the intermediate portion 14a of the first coil piece 12 and the second coil piece 13 constituting the first to third turns, The directions of the currents flowing through 15a and 21a are all in the reverse direction.

  And as shown in FIG. 7, when the electric current D flows into the lower layer coil piece part 14 of the 1st coil piece 12 which comprises the arrangement | sequence 3rd circle | round | yen start edge of the forward direction, the 1st coil arranged in the forward direction The intermediate portions 14a and 15a of the piece 12 and the intermediate portions 14a and 15a of the first coil piece 12 arranged in the opposite direction opposite to each other have a current in the same direction in the meridian direction around the rotation axis A of the rotor. Will flow

  That is, according to the forward direction arrangement and the reverse direction arrangement described above, the intermediate portions 14a, 15a, 21a of the first coil piece 12 and the second coil piece 13 constituting the U phase are always in the same direction in the upper layer and the lower layer. Current will flow.

Next, the connection terminal 40 that connects the first coil piece 12 that is the coil piece 11 arranged in the forward direction and the reverse direction and the other end of the second coil piece 13 will be described.
As shown in FIG. 8, the connection terminal 40 includes a connection member 41 made of a conductive material and an insulating member 42 made of an insulating material.

As shown in FIG. 8, the connection member 41 is a member made of a plate-like member made of a conductive material, and is a member for connecting the joint portions 14 d, 15 d, and 21 d. In addition, the connecting member 41 has a flat surface in contact with the joint portions 14d, 15d, and 21d. This is because such a flat surface has a large area in which the connection member 41 contacts the joint portions 14d, 15d, and 21d, and can avoid the possibility of contact failure.
The conductive material in the connection member 41 is preferably made of copper, copper alloy, aluminum, or aluminum alloy having a low resistivity, and more preferably the same material as the conductive material used for the coil piece 11 that comes into contact. .

The insulating member 42 is a member for avoiding that the connection member 41 that electrically connects the joint portions 14d, 15d, and 21d contacts the connection member 41 that is adjacent in the circumferential direction of the rotation axis A of the rotor. .
Further, as shown in FIG. 8, the insulating member 42 has a tapered tip end side that is inserted between the first coil piece 12 and the second coil piece 13. According to this, it becomes easy to insert the connection terminal 40 between the 1st coil piece 12 or the 2nd coil piece 13 arranged in the rotating shaft A direction of a rotor.

  As shown in FIG. 9, the connection terminal 40 has a diameter of the rotation axis A of the rotor so that the connection member 41 contacts the joints 14 d, 15 d, 21 d of the first coil piece 12 and the second coil piece 13. It is inserted and provided between the first coil piece 12 and the second coil piece 13 arranged so as to overlap in the direction. Thus, the first coil piece 12 and the second coil piece 13 are electrically connected via the connection member 41 of the connection terminal 40.

  Here, as shown in FIG. 9, when the connection terminal 40 is inserted between the first coil piece 12 or the second coil piece 13, the insulating member 42 is adjacent in the circumferential direction of the rotation axis A of the rotor. It has a width that allows the matching first coil piece 12 or second coil piece 13 to be pressed in the circumferential direction of the rotation axis A of the rotor. According to this, since the 1st coil piece 12 grade | etc., Is pressed in the circumferential direction of the rotating shaft A of a rotor by the connection terminal 40, the contact pressure which the junction parts 14d, 15d, 21d and the connection member 41 contact is ensured. Because it can be done.

Next, the base member 50 and the ring member 60 shown in FIG. 1 will be described.
The base member 50 and the ring member 60 are members that support the stator coil 10 so that the center of the stator coil 10 is positioned on the rotation axis A of the rotor. The ring member 60 is a member that supports the outer peripheral side of the stator coil 10.

As shown in FIGS. 1 and 2, the base member 50 is a cylindrical member centered on the rotation axis of the rotor, and a locking portion 51 is formed on the outer peripheral surface of the cylindrical member.
The locking portion 51 has the same width as the locked portion 16 of the first coil piece 12 and the locked portion 22 of the second coil piece 13, and the locking portion 51 has a first coil. The locked portion 16 of the piece 12 and the locked portion 22 of the second coil piece 13 are inserted, and the base member 50 can support the first coil piece 12 and the second coil piece 13.
The base member 50 is made of polyphenylene sulfide, glass fiber reinforced plastic (Glass Fiber Reinforce Plastics) in order to avoid electrical connection between the first coil piece 12 and the second coil piece 13 to be locked. ) Or the like.

Further, as shown in FIG. 2, the ring member 60 is a cylindrical member having an inner diameter substantially equal to the outer diameter of the stator coil 10, and is fitted to the outer peripheral side of the stator coil 10 so that the stator coil 10 is moved from the outer peripheral side. It becomes possible to support.
The ring member 60 is preferably high in rigidity from the viewpoint of holding the stator coil 10, and is preferably formed of stainless steel or an aluminum alloy.

Next, a method of using the axial gap type rotating electrical machine including the stator 1 in the embodiment will be briefly described.
First, the feed terminal connection portion 20e in the forward direction of the stator coil 10 constituting each of the U phase, V phase, and W phase is connected to an inverter having a control portion (not shown) via a bus bar (not shown). On the other hand, the feed terminal connecting portion 20e in the reverse direction of the stator coil 10 constituting each of the U phase, V phase, and W phase on the other end side connected to an inverter (not shown) is grounded.
When the rotor (not shown) is driven to rotate, the control unit controls the inverter (not shown) so that an AC signal is transmitted to any one of the U phase, V phase, and W phase corresponding to the permanent magnet provided on the rotor. Do.
Here, when the phase corresponding to the permanent magnet provided in the rotor is the U phase, the inverter sends an AC signal of the stator coil 10a constituting the U phase.
And the stator coil 10a which comprises the U phase which comprises a U layer is excited corresponding to the sent alternating current signal, and produces | generates the magnetic field which carries out around the intermediate parts 14a, 15a, and 21a as a rotating shaft.
Further, the magnetic field generated from the intermediate portions 14a, 15a, 21a receives a repulsive force from the permanent magnet provided facing the circumferential direction of the rotation axis A of the rotor, and the rotor rotates.
Next, the control unit controls the inverter so as to transmit an AC signal to the V-phase to the permanent magnet provided in the rotor. The stator coil constituting the V phase is excited to generate a magnetic force, and the rotor is driven with a driving force.
Thus, by sequentially exciting the U phase, V phase, and W phase, the rotor can continue to rotate.

  As described above, the stator 1 according to the present embodiment has been described. However, according to the present invention, the connection on the inner peripheral side of the stator coil 10 includes the locked portions 16 and 22. Further, the connection on the outer peripheral edge side of the stator coil 10 is connected by a connection terminal 40. Therefore, it is not necessary to join the ends of the plurality of coil pieces 11 by welding.

  In addition, the present invention is not limited to the above-described embodiment. For example, instead of the connection terminal 40 shown in the above-described embodiment, the connection terminals 140A and 140B shown in FIGS. 10 and 11 may be used.

As shown in FIG. 10, the connection terminal 140A includes a conductive member 141 in which a groove 141a is formed, and an insulating member 142 in which a protrusion 142a is formed.
The groove portion 141a formed in the conductive member 141 has a width that allows the joint portions 14d and 15d of the lower layer coil piece portion 14 and the upper layer coil piece portion 15 to be fitted to each other. The lower layer coil piece portion 14 and the upper layer coil piece portion 15 are connected by fitting the joint portions 14 d and 15 d of the upper layer coil piece portion 15. According to this, since the groove part 141a has pinched | interposed the lower layer coil piece part 14 and the upper layer coil piece part 15 from both surfaces, the poor contact by the lower layer coil piece part 14 and the upper layer coil piece part 15 separating is avoided. Can do.

Further, the protrusion 142 a formed on the insulating member 142 is provided between the conductive member 141 that connects the joint portions 14 d and 15 d of the lower layer coil piece portion 14 and the upper layer coil piece portion 15, and the adjacent conductive member 141. When inserted into the rotor, the conductive member 141 and the adjacent conductive member 141 have a width that can be pressed in the circumferential direction of the rotation axis A of the rotor.
Accordingly, the contact pressure between the joint portions 14d and 15d of the lower layer coil piece portion 14 and the upper layer coil piece portion 15 and the conductive member 141 can be increased, and the contact area can be ensured and the contact resistance can be reduced.

Further, as shown in FIG. 11, the connection terminal 140B is different from the connection terminal 140A in that it has an insulating member 143 instead of the insulating member 142 which is the configuration of the connecting terminal 140A.
The insulating member 143 is adjacent to the conductive member 141 when inserted between the conductive member 141 connecting the lower layer coil piece part 14 and the upper layer coil piece part 15 and the adjacent conductive member 141. The width is such that the conductive member 141 can be pressed in the circumferential direction of the rotation axis A of the rotor.
When the connection terminal 140B is used, the conductive member 141 may come into contact with the ring member 60. In such a case, an insulating coating process is performed on the outer peripheral surface side of the conductive member 141.

  In addition, the intermediate portions 14a, 15a, 20a, 21a of the non-connection portions in the first coil piece 12 and the second coil piece 13, the first bent portions 14b, 15b, 20b, 21b, and the second bent portions 14c, 15c, 20c and 21c may be subjected to insulating clothing treatment or clothing using an insulating tube. According to this, even if the first coil piece 12 and the second coil piece 13 locked to the base member 50 slide and come into contact with each other due to an impact or the like, it is possible to avoid electrical connection.

In addition, the ring member 60 in the embodiment has a shape that covers the outer peripheral surface side of the stator coil 10, but in the case of using a ring member of another shape, the second coil piece 13 described above is used instead. The 2nd coil piece 113 shown in FIG. 12 may be sufficient.
According to the second coil piece 113, the power supply terminal connecting portion 120 e of the second coil piece 113 protrudes not on the rotation axis A direction of the rotor of the stator 1 but on the outer peripheral side of the stator 1.
Therefore, since the power supply terminal connection portion 120e is not interposed between the stator coil 10 and a rotor (not shown) disposed opposite to the stator coil 10, there is a possibility that the magnetic field generated from the stator coil 10 may be disturbed by flowing through the power supply terminal connection portion 120e. Can be reduced.

DESCRIPTION OF SYMBOLS 1 Stator 10 Stator coil 10a Stator coil which comprises U phase 11 Coil piece 12 1st coil piece 13 2nd coil piece 14, 20 Lower layer coil piece part 14a, 15a, 20a, 21a Intermediate part 14b, 15b, 20b, 21b 1st 1 bent portion 14c, 15c, 20c, 21c 2nd bent portion 14d, 15d, 21d joined portion 15, 21 upper layer coil piece portion 16, 22 locked portion 17, 18 conductive plate member 17a, 18a extended portion 17b, 18b Clearance 18c Round hole 20e Power supply terminal connection 40, 140A, 140B Connection terminal 41 Connection member 42 Insulating member 50 Base member 51 Locking part 60 Ring member 141 Conductive member 141a Groove 142, 143 Insulating member 142a Protruding part

Claims (6)

A stator coil provided in a stator of an axial gap type rotary electric motor that rotates a rotor,
A plurality of coil pieces, each of which is a conductor and is locked at one end to a base member provided on the stator;
A plurality of connection terminals for connecting the other end sides of a plurality of coil pieces locked at one end side to the base member,
The coil piece is positioned on one end side of the coil piece and is locked to the base member, and a pair extending from one side of the locked portion to the other end side of the coil piece. An upper layer coil piece portion and a lower layer coil piece portion formed by being bent so as to open the extending portion in the circumferential direction of the rotating shaft of the rotor,
The upper layer coil piece part and the lower layer coil piece part are a first bent part extending from one side of the locked part, a long intermediate part having a predetermined angle from the first bent part, A predetermined shape having a second bent portion extending from the intermediate portion so as to have a predetermined angle;
The plurality of coil pieces are locked to the base member and arranged in the circumferential direction of the rotation shaft of the rotor,
The two coil pieces adjacent to each other in the circumferential direction of the rotating shaft of the rotor are the other end side of the upper coil piece part of one coil piece and the other end side of the lower layer coil piece part of another coil piece. Are overlapped in the direction of the rotation axis of the rotor,
The connection terminal electrically connects the other end side of the upper layer coil piece portion of the one coil piece and the other end side of the lower layer coil piece portion of another coil piece to form a coil loop. A stator coil. The plurality of coil pieces are composed of a first coil piece and a second coil piece,
The first coil piece has a joint extending on the other end side of the upper layer coil piece portion and the lower layer coil piece portion so as to bend and extend at a predetermined angle from an end portion of the second bent portion,
The second coil piece has a joint extending at a predetermined angle from an end portion of the second bent portion on the other end side of either the upper layer coil piece portion or the lower layer coil piece portion. A power supply terminal connecting portion extending at a predetermined angle from an end portion of the second bent portion on the other end side of either the upper layer coil piece portion or the lower layer coil piece portion. The stator coil according to claim 1. The connection terminal is
Extending in the rotation axis direction of the rotor and abutting with the other end side of the upper layer coil piece part of the one coil piece and the other end side of the lower layer coil piece part of the other coil piece on one end surface side A conductive material connection member;
The stator coil according to claim 1, further comprising: an insulating member made of a non-conductive material interposed on the other end surface side of the connection member. The connection terminal has a connection member made of a flat plate-like conductive material having a flat portion,
The planar portion is in contact with the other end side of the upper layer coil piece portion of the one coil piece and the other end side of the lower layer coil piece portion of the other coil piece, and the other end side of the upper layer coil piece portion. 2. The stator coil according to claim 1, wherein the stator coil is electrically connected to the other end side of the lower layer coil piece portion. The connection terminal is composed of a connection member made of a conductive material in which a groove is formed, and an insulation member made of an insulating material having a protrusion,
The connecting member is configured to fit the groove portion to the other end side of the upper layer coil piece portion of the one coil piece and the other end side of the lower layer coil piece portion of the other coil piece. 2. The stator coil according to claim 1, wherein the other end side of the upper layer coil piece portion of the piece is electrically connected to the other end side of the lower layer coil piece portion of another coil piece. When the other end side of the upper layer coil piece part of the one coil piece and the other end side of the lower layer coil piece part of the other coil piece are connected to each other, the connection terminal is connected to the adjacent connection terminal of the rotor. The stator coil according to claim 4 or 5, wherein the stator coil is pressed in a circumferential direction of the rotating shaft.

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