JP5915151B2 - Motor coil - Google Patents

Description

  The present invention relates to a wave winding of a rotating electrical machine and a fixing method thereof.

  As a method for winding a stator winding or a rotor winding of a rotating electric machine such as a motor, a wave winding method in which a conductor is wound in a wave shape is known. For example, the winding for electric motors described in Non-Patent Documents 1 and 2 can be cited as an example of the wave winding method. In the inventions described in Non-Patent Documents 1 and 2, a slotless motor winding is formed using a helical winding.

Yaskawa Electric Technical Report Vol. 51 (Vol. 197) No. 4 1987 351-359 Yaskawa Electric Technical Report Vol. 53 (Vol. 205) No. 4 1989 pages 304-312

  However, in the inventions described in Non-Patent Documents 1 and 2, since the stator core does not have a slot, it is difficult to apply to an electric motor having a small magnetic flux density in the gap between the rotor and the stator and a relatively large output torque. It was. In addition, when a three-phase coil widely used in rotating electrical machines is wound, there is a problem in that the coil ends overlap, resulting in a large space at the coil ends and an increase in the size of the rotating electrical machine. It was.

The present invention has been made in view of the above circumstances, and provides a motor coil provided with a helically wound sheet-like coil that can be applied to a rotating electrical machine having a stator core with slots, with a high space factor at the coil end. The task is to do.

According to a first aspect of the present invention, there is provided a motor coil comprising a forward conductor portion and a return conductor portion alternately inserted into slots of a stator core formed in an annular shape, and a forward conductor formed integrally with the coil side portion. A helically wound sheet-like coil wound in a radial direction of the stator core, the coil conductor having a coil end portion connecting the same side end portion of the return portion and the return conductor portion connected in a helical manner to form a wave winding configuration The helically wound sheet-like coil is a forward conductor in which coil side portions are laminated in the sheet thickness direction and formed in two layers, and coil end portions are arranged in two different layers. Coil element is formed by connecting the coil part and the return conductor part in turn in the wave winding direction, and a pair of adjacent coil elements in the same slot is used. A pair of coil units connected is arranged in the direction is connected in series with each other to form a phase unit coil, electromagnetically different phases unit coil phases of the same phase are connected in series, the stator core, of the radial A helically wound sheet-like coil is provided on the circumferential side, and the helically wound sheet-like coil has a diameter in a direction from the slot bottom side to the slot opening side of the stator core so as to lap around the circumferential direction of the stator core. The winding direction of the helically wound sheet coil starting from the coil terminal portion is the direction opposite to the winding direction of the helical winding when viewed from the coil terminal portion take-out side in the motor rotation axis direction. Is attached to the stator core.
According to a second aspect of the present invention, there is provided a motor coil comprising a forward conductor portion and a return conductor portion alternately inserted into each slot of a stator core formed in an annular shape, and a forward conductor formed integrally with the coil side portion. A helically wound sheet-like coil wound in a radial direction of the stator core, the coil conductor having a coil end portion connecting the same side end portion of the return portion and the return conductor portion connected in a helical manner to form a wave winding configuration The helically wound sheet-like coil is a forward conductor in which coil side portions are laminated in the sheet thickness direction and formed in two layers, and coil end portions are arranged in two different layers. Coil element is formed by connecting the coil part and the return conductor part in turn in the wave winding direction, and a pair of adjacent coil elements in the same slot is used. A pair of coil units arranged in a direction and connected to each other are connected in series to form a phase unit coil, and phase unit coils having the same phase and different electromagnetic phases are connected in series, and the stator core has a radially outer periphery. A helically wound sheet-like coil is provided on the side, and the helically wound sheet-like coil is a radial direction that is a direction from the slot bottom side to the slot opening side of the stator core so as to circulate in multiple directions along the circumferential direction of the stator core. The winding direction of the helically wound sheet-like coil starting from the coil terminal portion is the same as the helical winding direction as viewed from the coil terminal portion take-out side in the motor rotation axis direction. It is attached to the stator core.

The helically wound sheet-like coil of the motor coil according to claim 3 is the motor coil according to claim 1 or 2, wherein adjacent coil side portions in the moving direction of the mover magnetic pole are separated so as to accommodate the magnetic pole teeth of the stator core. ing.

A helically wound sheet-like coil of a motor coil according to a fourth aspect of the present invention is the coil unit according to any one of the first to third aspects, wherein the coil unit is composed of parallel fine wires in which a plurality of fine wires are arranged in parallel.

Helically-wound sheet-shaped coil of a motor coil according to claim 5, in claim 4, thin lines to each other are wound so as not to cross.

Motor coil according to claim 6, in any one of claims 1 to 5, the coil side pitch, at least one of the cross-sectional shape of height and coil side portions of the coil ends, attached peripheral to the stator core It differs for every and the cross-sectional shape of a coil end has a common shape part between coil units.

According to the motor coil of the first aspect, the helically wound sheet-like coil has a pair of adjacent coil elements in the same slot, and the coil elements are arranged in the moving direction of the mover magnetic pole every two magnetic pole pitches. The relative positional relationship between the coil elements in the moving direction of the mover magnetic pole can be maintained. Further, the forward conductor portion and the return conductor portion arranged on different layers of the coil side portions formed in two layers in the thickness direction are connected in order so as to be helically connected by the coil end portions to form a wave winding configuration. Since the coil unit is formed, it is possible to regularly arrange the layers between the constituent conductors at the end of the coil. Therefore, the overlapping of the coil end portions can be finely avoided three-dimensionally, the space factor of the coil end portions can be improved, and the space of the coil end portions can be reduced. Further, in the full-pitch wave winding configuration, the phase unit coils having the same phase and different electromagnetic phases are connected in series so that the current directions of the coil sides located in one magnetic pole coincide with each other. Winding effects can be obtained, and torque ripple and the like can be reduced. Furthermore, since the coil end can be shortened and made compact, leakage reactance can be reduced.
In addition, according to the motor coil according to claim 1 or 2, since the coil wire end portion and the coil terminal portion can be arranged at the slot radial direction end portion of the stator core, the coil wire end portion and the coil terminal The part can be routed so as not to intersect the coil end, and the rotating electrical machine can be reduced in size.

According to the motor coil according to claim 3, helically-wound sheet-shaped coil, between the coil side portions adjacent in the moving direction of the mover poles, because it is capable of accommodating spaced magnetic pole teeth of the stator core, the slot It can be used for a rotating electrical machine having a stator core.

According to the motor coil according to claim 4, helically-wound sheet-shaped coil, the coil unit, since the parallel thin lines in which a plurality of thin wires in parallel, making it possible to reduce the eddy current loss generated in the coil conductor section This improves motor efficiency. Moreover, since the force required for coil forming can be reduced, the moldability is improved and the coil can be manufactured easily.

According to the motor coil according to claim 5 , since the helically wound sheet-like coil is wound so that the thin wires do not cross each other, the coil end portion can be made compact and the space factor can be increased. Can be reduced in size and cost.

According to the motor coil according to claim 6 , since the coil side pitch or the height of the coil end is formed in accordance with the circumference attached to the stator core, the coil length can be made appropriate for each attachment circumference, The rotating electrical machine can be reduced in size and cost. Moreover, since the cross-sectional shape of a coil side part changes for every attachment periphery, the space factor in a coil side part can be raised. Furthermore, since the cross-sectional shape of the coil end portion has a common shape portion between the coil units, the coil end portion can be made compact.

It is a schematic diagram which shows the unit coil part of 1 phase of a helical winding sheet-like coil. It is a schematic diagram which shows the part for three phases of a helical winding sheet-like coil. It is AA-AA sectional drawing of FIG. It is a figure which shows typically the phase structure of a helical winding sheet-like coil. It is a figure which shows typically the connection state of the U phase of a helical winding sheet-like coil. It is a figure which shows typically the edge part structure of the helical winding sheet-like coil by sheet | seat end connection. It is a figure which shows typically the edge part structure of the helical winding sheet-like coil by sheet | seat end routing. It is a figure which shows the arrangement | sequence of a parallel thin wire | line typically. It is a figure which shows typically the connection state in the layer crossing state and sheet | seat edge part of the motor coil with which the helical winding sheet-like coil was laminated | stacked. It is a figure which shows typically the motor coil by which the helical winding sheet-like coil is wound on the radial direction of the stator core. It is a figure which shows typically the motor coil by which the helical winding sheet-like coil is wound on the axial direction of the stator core. It is a figure which shows typically the motor coil by which the helical winding sheet-like coil is deform | transformed for every attachment periphery to a stator core. It is explanatory drawing which shows the procedure which fixes the helical winding sheet-like coil which consists of a parallel thin wire | line to the stator core of a semi-closed slot.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description is abbreviate | omitted by attaching | subjecting a common code | symbol to a common location about each embodiment, and making it respond | correspond. Each figure is a conceptual diagram and does not define the dimensions of the detailed structure.

(1) Helical Wound Sheet Coil FIG. 1 is a schematic diagram showing a unit coil of one phase of a helical wound sheet coil. (B) has shown the state by which the coil conductor was wound by the winding core, (c) has shown the state which removed the winding core in (b). (D) shows the winding state (perspective view from the B side) of the coil conductor on the back side (A side) of the drawing, and (e) shows the winding of the coil conductor on the front side (B side) of the drawing. Indicates the state.

  The solid line in FIG. 1 shows a state in which the coil conductor is wound every six winding pitches (one magnetic pole pitch) from the position of the winding pitch S10. The coil unit 1a indicated by a solid line is wound in the direction from the front side (B side) to the back side (A side) of the drawing sheet at the position of the winding pitch S10, and the winding pitches S10, S16, S22, and S28. In S34, the coil unit 1a is formed with a coil side portion 10a extending linearly in the short direction of the core (direction perpendicular to the core axis). The coil side portion 10a formed when the coil conductor is wound from the B side toward the A side in FIG. 1 is referred to as a forward conductor portion 11a, and is wound from the A side toward the B side. The formed coil side portion 10a is referred to as a return conductor portion 12a. The same side end portions of the forward conductor portion 11a and the return conductor portion 12a are connected by a coil end portion 20a formed integrally with the coil side portion 10a. The coil end portion 20a is bent at the winding pitches S13, S19, S25, S31, and S37 to form the bent portions 21a.

  As shown in FIG. 1, in this specification, the coil end 20a for the half pole pitch, the forward conductor 11a, the coil end 20a for one pole pitch, the return conductor 12a, and the half pole pitch The coil conductor having the coil end portion 20a is referred to as a coil element 4a. A coil conductor in which the coil elements 4a are arranged and connected in the longitudinal direction (core axis direction) of the core every two magnetic pole pitches is referred to as a coil unit 1a.

  The broken line in FIG. 1 shows a state in which the coil conductor is wound every six winding pitches (one magnetic pole pitch) from the position of the winding pitch S10, similarly to the coil unit 1a indicated by the solid line. The coil unit 1b indicated by the broken line is different from the coil unit 1a indicated by the solid line in that the coil unit 1b is wound in the direction from the back side (A side) to the front side (B side) of the paper surface at the winding pitch S10. The coil unit 1b indicated by a broken line is formed with a coil side portion 10b at winding pitches S10, S16, S22, S28 and S34 in the same manner as the coil unit 1a indicated by a solid line. And a return conductor portion 12b. Moreover, the same side edge part of the outgoing conductor part 11b and the return conductor part 12b is connected by the coil edge part 20b formed integrally with the coil side part 10b. The coil end portion 20b is bent at winding pitches S13, S19, S25, S31, and S37 to form the bent portions 21b.

  Similar to the coil unit 1a, in this specification, the coil end portion 20b corresponding to the half pole pitch, the forward conductor portion 11b, the coil end portion 20b corresponding to one pole pitch, the return conductor portion 12b, and the half pole pitch portion are used. The coil conductor having the coil end portion 20b is referred to as a coil element 4b. A coil conductor in which the coil elements 4b are arranged and connected in the longitudinal direction (core axis direction) of the core every two magnetic pole pitches is referred to as a coil unit 1b. A coil unit 1a indicated by a solid line and a coil unit 1b indicated by a broken line are paired in the sheet thickness direction.

  When pressure forming so that the coil side 10a of the coil unit 1a and the coil side 10b of the coil unit 1b are in close contact with each other in the sheet thickness direction, the coil side 10a and the coil side 10b are Alignment is performed in the longitudinal direction (core axis direction) with two magnetic pole pitches separated over two layers. The coil side portion 10a and the coil side portion 10b formed on the back side (A side) of the paper surface are referred to as a first layer, and the coil side portion 10a and the coil side portion 10b formed on the front side (B side) of the paper surface are referred to as the first layer. This is called the second layer. FIG. 1A and FIG. 1F show the layer crossing state of the coil conductor in the first layer and the second layer. In these figures, the layered state of the coil conductor is schematically illustrated so that the portion connecting the layers is the shortest. When the coil units 1a and 1b are attached to the stator core, the longitudinal direction (core axis direction) of the core shown in FIG. 1 corresponds to the moving direction of the mover magnetic pole.

  FIG. 2 is a schematic diagram showing a three-phase portion of a helically wound sheet-like coil. FIG. 2 corresponds to (a) to (f) of FIG. 1 respectively, and the winding pitch S shown in FIG. 2 corresponds to the winding pitch S shown in FIG. FIG. 3 is a cross-sectional view taken along the line AA-AA in FIG. In the present embodiment, a pair of coil element 4a indicated by a solid line and coil element 4b indicated by a broken line adjacent to each other in the same slot is taken as a pair, and the pair of coil elements 4a and 4b is in the longitudinal direction of the core (core axis Direction). For example, as shown in FIGS. 2 and 3, the coil element 4a is formed between the second layer of the winding pitch S10 and the first layer of the winding pitch S16, and the coil element 4b paired therewith is: It is formed between a first layer having a winding pitch S10 and a second layer having a winding pitch S16. Similarly, a coil element 4a is formed between the second layer of the winding pitch S11 advanced by one winding pitch and the first layer of the winding pitch S17. It is formed between the first layer having the pitch S11 and the second layer having the winding pitch S17.

  In the present embodiment, as shown in FIG. 3, in the moving direction of the mover magnetic pole, the U phase (forward direction U1), U phase (forward direction U2), W phase (reverse direction W1), W phase (reverse direction W2). ), V phase (forward direction V1), V phase (forward direction V2), U phase (reverse direction U1), and U phase (reverse direction U2). In the present embodiment, two in-phase coil units 1a and 1b are adjacent to each other in the moving direction of the mover magnetic pole, and the winding unit of the in-phase coil is four. The in-phase coil units 1a, 1b, 1a, and 1b are connected in series so that the directions of currents that flow when the rotating electrical machine is driven coincide with each other, and a three-phase winding composed of 12 winding units is configured. As shown in the figure, adjacent coil sides in the moving direction of the mover magnetic poles are separated by a predetermined interval of 1 W so as to accommodate the magnetic pole teeth of the stator core.

  FIG. 4 is a diagram schematically showing the phase configuration of the helically wound sheet-like coil. In the present embodiment, coil units 1a and 1b that are paired in the sheet thickness direction are connected in series at the sheet end portion to form a phase unit coil 5U1. Coil units 1a and 1b that form a pair in the sheet thickness direction that is spaced apart in the moving direction of the mover magnetic pole by one winding pitch with respect to the coil units 1a and 1b constituting the phase unit coil 5U1 are the sheet end portions. Are connected in series to form a phase unit coil 5U2. The phase unit coils 5U1 and 5U2 are connected in series at the end of the sheet to form the phase coil 6U.

  FIG. 5 is a diagram schematically showing a connection state of the U-phase of the helically wound sheet-like coil. Starting from the U-phase terminal 5TU, the coil units 1a and 1b of the phase unit coil 5U1 and the coil units 1a and 1b of the phase unit coil 5U2 are connected in series and connected to the neutral point 5N, and the U-phase coil 6U Is formed. Since the phase unit coils 5U1 and 5U2 are separated by one winding pitch in the moving direction of the mover magnetic pole, the induced voltage generated by the phase unit coils 5U1 and 5U2 is in phase (U phase), but accurately Are out of phase. In this specification, this is referred to as “electromagnetically different phases”. The same applies to the V phase and the W phase. As shown in FIG. 4, the V phase and the W phase have the same phase configuration as the U phase.

  FIG. 6 is a diagram schematically showing an end configuration of a helically wound sheet coil by sheet end connection. This figure shows a connection state of windings at both ends of the sheet as viewed in the sheet thickness direction. (A)-(c) has shown the connection state for 1 phase of U phase-W phase in order, (d) has shown the connection state for 3 phases. In the same figure, like FIG.1 and FIG.2, the coil unit 1a is shown as the continuous line, and the coil unit 1b is shown with the broken line. The circled numbers in the figure indicate the connection order of the windings from the phase terminal to the neutral point. Hereinafter, the U phase will be described as an example based on FIG. 5A, but the same applies to the V phase and the W phase.

  The coil unit 1a of the phase unit coil 5U1 is wound in the right direction on the paper surface with the U-phase terminal 5TU as a starting point (round numerals 1 to 5). The coil unit 1a of the phase unit coil 5U1 is connected to the coil unit 1b of the phase unit coil 5U1 at the connection point 5JU1 at the sheet end. The coil unit 1b of the phase unit coil 5U1 is wound around the connection point 5JU1 and wound in the left direction on the paper (circle numerals 6 to 10). The coil units 1a and 1b of the phase unit coil 5U1 are paired in the sheet thickness direction.

  The coil unit 1b of the phase unit coil 5U1 is connected to the coil unit 1a of the phase unit coil 5U2 at the connection point 5JU2 at the sheet end. The phase unit coil 5U2 is separated from the phase unit coil 5U1 by one winding pitch in the moving direction of the mover magnetic pole (the right direction in the drawing). The coil unit 1a of the phase unit coil 5U2 is wound in the right direction on the paper (circle numerals 11 to 16), and is connected to the coil unit 1b of the phase unit coil 5U2 at the connection point 5JU3 at the sheet end. The coil unit 1b of the phase unit coil 5U2 is wound around the connection point 5JU3 and wound in the left direction of the drawing (round numerals 17 to 22), and is connected to the neutral point 5N. The coil units 1a and 1b of the phase unit coil 5U2 make a pair in the sheet thickness direction.

  The end part configuration of the helically wound sheet-like coil may be the following end unit configuration. FIG. 7 is a diagram schematically showing an end configuration of a helically wound sheet-like coil by sheet end routing. The end configuration shown in FIG. 7 is different from the end configuration shown in FIG. 6 in that it does not have a connection point of the coil units 1a and 1b at the sheet end portion on the right side of the drawing. (A) to (d) in FIG. 7 correspond to (a) to (d) in FIG. 6 respectively, and common portions are denoted by the same reference numerals so as to correspond to each other. Omitted. Hereinafter, the U phase will be described as an example based on (a), but the same applies to the V phase and the W phase.

  In FIG. 7, the coil units 1a and 1b are distinguished from each other by a solid line and a broken line for convenience of explanation, but the coil units 1a and 1b are integrally formed. Specifically, the phase unit coil 5U1 is wound in the right direction on the paper surface starting from the U-phase terminal 5TU (corresponding to the coil unit 1a indicated by a solid line, circled numbers 1 to 5), and then the coil routing point 5RU1. And wound in the left direction of the paper (corresponding to the coil unit 1b indicated by a broken line, circled numbers 6 to 10). The phase unit coil 5U2 is wound in the right direction of the drawing with the connection point 5JU2 with the phase unit coil 5U1 as the starting point (corresponding to the coil unit 1a, circled numbers 11 to 16), and then wound back at the coil routing point 5RU2. It is wound in the left direction of the paper (corresponding to the coil unit 1b. Round numerals 17 to 22) and is connected to the neutral point 5N.

  The end configuration in which the coil is routed at the sheet end does not have a connection point at the sheet end in the right direction of the paper, so the coil ends 20a and 20b are more compact than when the coils are connected at the sheet end. Can be. On the contrary, since the end part structure which connects coils at the sheet | seat edge part can mutually connect after mutually winding coil unit 1a, 1b, compared with the case where a coil is drawn, Easy to manufacture.

  In the present embodiment, a pair of adjacent coil elements 4a and 4b in the same slot, and the coil elements 4a and 4b are arranged in the moving direction of the mover magnetic pole every two magnetic pole pitches. The relative positional relationship between the coil elements 4a and 4b can be maintained. Further, the forward conductor portions 11a and 11b and the return conductor portions 12a and 12b arranged in different layers of the coil side portions 10a and 10b formed in two layers in the thickness direction are helically formed by the coil end portions 20a and 20b. Since the coil units 1a and 1b are sequentially connected so as to form a connected wave winding configuration, the coil end portions 20a and 20b can be regularly arranged between the constituent conductors by being arranged for each constituent conductor. Therefore, the overlapping of the coil end portions 20a and 20b can be finely avoided three-dimensionally, the space factor of the coil end portions 20a and 20b can be improved, and the space of the coil end portions 20a and 20b can be reduced. Can do.

  Further, in the full-pitch wave winding configuration, the phase unit coils 5X1 and 5X2 (X is any of U, V, and W) having the same phase and different electromagnetic phases are the currents in the coil sides located in one magnetic pole. Since they are connected in series so that the directions coincide with each other, the effect of short winding can be obtained, and torque ripple and the like can be reduced. Furthermore, since the coil ends 20a and 20b can be shortened and made compact, leakage reactance can be reduced.

  At the end of this section, the coil winding of the helically wound sheet coil will be described in detail. In the present embodiment, the windings of the coil units 1a and 1b use parallel thin wires in which three thin wires having a substantially square cross section are arranged in parallel. The parallel thin wires are wound so that the thin wires do not cross each other. FIG. 8 is a diagram schematically showing the arrangement of parallel thin wires. Assuming that the parallel thin wires of the forward conductor portion 11a are arranged in the order of 1, 2, and 3 in the BB-BB view, the parallel thin wires of the return conductor portion 12a are 1 in the CC-CC view. They are arranged in the state of winding back in the order of 2, 3. The same applies to the winding of the coil unit 1b.

  In addition, the number of fine wires constituting the winding and the cross-sectional shape of the fine wires are not particularly limited, and can be any number and any cross-sectional shape. For example, thin lines having various cross-sectional shapes such as a circular line having a circular cross section and a square line having a polygonal cross section can be used. The winding may be a single wire composed of a single thin wire. In the case of a single wire, the cross-sectional shape of the thin wire is not particularly limited as in the case of the parallel thin wire, and any cross-sectional shape including the above-described cross-sectional shape can be used. The winding has a conductor surface covered with an insulating layer such as enamel.

  In the present embodiment, the coil units 1a and 1b are formed of parallel fine wires in which a plurality (three in FIG. 8) of fine wires are arranged in parallel, so that eddy current loss generated in the coil conductor portion is reduced compared to the case of a single wire. Motor efficiency can be improved. Moreover, since the force required for coil forming can be reduced, the moldability is improved and the coil can be manufactured easily. Furthermore, since the thin wires are wound so as not to cross each other, the coil end portions 20a and 20b can be made compact to increase the space factor, and the rotating electrical machine can be reduced in size and cost.

  The coil units 1a and 1b can be formed, for example, by winding a thin wire in a helical shape around a winding core. Each thin wire may be wound around the core or a plurality of thin wires may be wound at the same time. In order to secure the winding pitch S, a pin, a groove, or the like may be provided on the core, and the winding may be performed using the pin or groove as a guide. Then, as shown in FIG. 2, after winding all the windings, the core is removed from the windings, and the coil sides 10a and 10b forming the pair of coil units 1a and 1b are added so as to be in close contact with each other. Press molding. In consideration of the case where the winding is damaged during pressure molding, a repair resin coating or the like may be applied after pressure molding.

(2) Motor Coil FIG. 9 is a diagram schematically showing a layer crossing state and a connection state at a sheet end portion of a motor coil in which helical winding sheet coils are laminated. In this preferred embodiment, the motor coil are stacked three in a direction perpendicular to the helical wound sheet-shaped coil 3 consisting of two layers moving surface of the movable element pole is formed. As a result of stacking the three helically wound sheet-like coils 3, 3, 3, the layers composed of the coil side portions 10 a, 10 b are formed into six layers. The three helically wound sheet-like coils 3, 3, 3 are arranged so as to be in phase with each other in the moving direction of the mover magnetic pole, and the coil ends of the same phase are electromagnetically effective for operating as a motor. It is electrically connected so that current flows in the direction.

  FIG. 4A shows a case where three helically wound sheet-like coils 3, 3, 3 are connected in series, and FIG. 4B shows a case where they are connected in parallel. The connection of the windings shows only the U phase, and the end configuration of the sheet end is shown as an example in which the coil is routed. The connection method of the V-phase and W-phase windings is the same as that of the U-phase, and an end configuration in which the coils are connected to each other at the sheet end portion can also be adopted. The cross-layer state and the connection state of the winding are as viewed from the sheet side surface direction (direction of arrow E shown in FIG. 7D), and the cross-layer state is schematically illustrated so that the portion connecting the layers is the shortest. Show. The circled numbers in the figure indicate the connection order of the windings from the U-phase terminal 5TU to the neutral point 5N.

  In the case of the series connection shown in FIG. 5A, the U-phase terminal 5TU is connected to the phase unit coil 5U1 of the first helically wound sheet-like coil 3. The phase unit coil 5U1 is wound in the right direction on the paper, and then wound back at the coil routing point 5RU1 and wound in the left direction on the paper (circle numerals 1 to 2). The phase unit coil 5U2 is wound in the right direction on the paper surface starting from the connection point 5JU2 with the phase unit coil 5U1, and then wound around the coil routing point 5RU2 and wound in the left direction on the paper surface (round). Numbers 3-4). The phase unit coil 5U2 is connected to the phase unit coil 5U1 of the second helically wound sheet coil 3 (circle numeral 5).

  The second helically wound sheet-like coil 3 is wound in the same manner as the first helically wound sheet-like coil 3 (round numerals 6 to 9). The phase unit coil 5U2 of the second helically wound sheet coil 3 is connected to the phase unit coil 5U1 of the third helically wound sheet coil 3 (circle numeral 10). The third helically wound sheet-like coil 3 is wound in the same manner as the first and second helically wound sheet-like coils 3 (round numerals 11 to 14), and a neutral point 5N is formed. Yes.

  On the other hand, in the case of the parallel connection shown in FIG. 5B, the U-phase terminal 5TU is connected to the phase unit coil 5U1 of the three helically wound sheet-like coils 3, 3 and 3, respectively. The connection in the helically wound sheet-like coil 3 is the same as in the case of the series connection in FIG. 5A (round numerals 1 to 4), but the neutral point 5N is the three helically wound sheet-like coils 3, 3 The three phase unit coils 5U2 are different from each other. Note that the three neutral points 5N may be individually provided in the three helically wound sheet-like coils 3, 3, and 3, and the three neutral points 5N are electrically connected, It may be substantially one neutral point.

In this preferred embodiment, so that the helically-wound sheet-shaped coil 3,3,3 are stacked three in a direction perpendicular to the moving plane of the movable element pole, the electromagnetically active phase construction in order to operate as a motor Since the sheet coil length for one sheet can be shortened, coil forming and assembly to the stator core are simplified. The three helically wound sheet-like coils 3, 3, 3 can also be arranged with a phase difference corresponding to the skew in the moving direction of the mover magnetic pole. Thereby, a rapid magnetic flux change can be suppressed and torque ripple etc. can be reduced.

  Further, one helically wound sheet-like coil 3 to be laminated is formed by connecting a helically wound sheet-like coil corresponding to one magnetic pole pair of the rotor as a unit and connecting it in series over one circumference of the stator. You can also. In addition, the number of layers of the helically wound sheet-like coil 3 is not limited to three, and can be any number of layers.

(Embodiment)
FIG. 10 is a diagram schematically showing a motor coil in which a helically wound sheet coil is wound in the radial direction of the stator core. In this embodiment, the helically-wound sheet-shaped coil 3 consisting of two layers are wound up in a radial direction of the stator core, the motor coil is formed. The motor coil of this embodiment can be used for a radial cylindrical motor in which a rotor and a stator are arranged concentrically in the radial direction.

The stator core is provided with a helically wound sheet-like coil 3 on the radially inner peripheral side, and the helically wound sheet-like coil 3 is slotted from the slot bottom side of the stator core so as to circulate in multiple directions along the circumferential direction of the stator core. If you superimposed wound radially inward a direction toward the opening side, viewing the coils terminal portions from the coil terminal portion extraction side of the motor rotation axis direction of the helically-wound sheet-shaped coil 3 to a starting point and circumferential direction, that attached to the stator core such that the winding direction opposite to the direction of the helical winding. On the other hand, the stator core is provided with a helically wound sheet-like coil 3 on the outer peripheral side in the radial direction, and from the bottom side of the slot of the stator core so that the helically wound sheet-like coil 3 wraps around the stator core in a multiple manner. If you have superimposed wound radially outward a direction towards the slot opening side, the coils terminal portions from the coil terminal portion extraction side of the motor rotation axis direction of the helically-wound sheet-shaped coil 3 to a starting point viewing the circumferential direction, that attached to the stator core to be the same direction as the winding direction of the helical winding.

  As a result, the coil wire end and the coil terminal can be disposed at the end of the stator core in the slot radial direction, so that the coil strand end and the coil terminal are not crossed with the coil ends 20a and 20b. The rotating electric machine can be reduced in size. Here, the coil wire end portion refers to a coil conductor portion that connects the coil unit 1a and the coil unit 1b on the phase terminal (5TU to 5TW) side. A coil terminal part means the coil conductor part which connects a phase terminal (5TU-5TW) and the coil unit 1a.

( Reference form)
FIG. 11 is a diagram schematically showing a motor coil in which a helically wound sheet-like coil is wound in the axial direction of the stator core. In this reference embodiment, a helically wound sheet-like coil 3 consisting of two layers is wound in the axial direction of the stator core to form a motor coil. The motor coil of the present reference embodiment can be used for axial type cylindrical motor rotor and the stator are disposed coaxially.

(Deformation form)
FIG. 12 is a diagram schematically showing a motor coil in which a helically wound sheet-like coil is deformed for each circumference of attachment to the stator core. (A) And (b) shows the axial view section of a motor coil, (c) And (d) shows the axial view section of the slot portion of a stator core.

  The figure (a) shows a direction that is electromagnetically effective in operating as a motor by laminating a plurality of (two in the figure) helical wound sheet-like coils 3 and connecting their both ends 31, 32 as appropriate. Shows a concentric cylindrical motor coil formed to allow current to flow through. FIG. 2B shows a cylindrical motor coil formed by winding a helically wound sheet-like coil 3 in the radial direction of the stator core (two rounds in the figure). Since the cylindrical motor coil has different circumferences on the inner circumference side and the outer circumference side, the required coil length differs depending on the circumference of the attachment to the stator core. Further, when a motor coil having the same cross-sectional shape is attached to the slot forming the parallel magnetic pole, the space factor of the coil side portions 10a and 10b differs depending on the circumference to be attached.

  In this modification, the coil side pitch of the helically wound sheet-like coil 3, the height of the coil end, and the cross-sectional shape of the coil side are different for each mounting circumference. The coil side pitch refers to the distance between the one-phase forward conductor portion 11a and the return conductor portion 12a or the distance between the one-phase forward conductor portion 11b and the return conductor portion 12b. The height of the coil end refers to the distance from the bent portion 21a of the coil end 20a to the straight line connecting the same side ends of the forward conductor portion 11a and the return conductor portion 12a or from the bent portion 21b of the coil end portion 20b. The distance to the straight line connecting the same side end portions of the conductor portion 11b and the return conductor portion 12b. In this modification, the cross-sectional shape of the coil side portions 10a and 10b is preferably changed based on the equal cross-sectional area. In this modification, the coil length can be made appropriate for each mounting circumference by forming the coil side pitch or the coil end height in accordance with the mounting circumference. Moreover, since adjustment can be performed according to the assembly operation of the stator core and the coil, the rotating electrical machine can be reduced in size and cost.

  When a motor coil is attached to a slot forming a parallel magnetic pole, as shown in FIG. 4C or FIG. 4D, the cross-sectional shape of the coil side portions 10a and 10b is adjusted for each attachment circumference in accordance with the shape of the magnetic pole tooth portion 40. Can be changed based on an equal cross-sectional area. The cross-sectional shape of the coil side portions 10a and 10b can be any shape including a rectangle or a trapezoid shown in FIG. When using parallel thin wires for the windings, the arrangement of the thin wires can be changed in accordance with the shape of the magnetic pole tooth portion 40. Thereby, the space factor in coil side part 10a, 10b can be raised. The helically wound sheet-like coil 3 is formed in two layers (two coil conductors) in the sheet thickness direction, but the sectional shapes of the two coil conductors are substantially the same. You may change the cross-sectional shape of a coil conductor for every mounting circumference.

  In this variation, the coil side pitch, the coil end height, and the coil side cross-sectional shape are all different for each mounting circumference, but at least one of these is attached to each mounting circumference in accordance with the motor specifications. It can also be changed to Furthermore, in this modification, the coil end portions 20a and 20b have a common sectional shape in the vicinity of the bent portions 21a and 21b between the coil units 1a and 1b. Therefore, since the coil end portions 20a and 20b have substantially the same central portion in the circumferential direction, the coil end portions 20a and 20b can be aligned for each constituent conductor at the substantially central portion, and the coil end portions 20a and 20b can be made compact. be able to.

(3) Fixing method of helically wound sheet-like coil FIG. 13 is an explanatory diagram showing a procedure for fixing a helically wound sheet-like coil composed of parallel thin wires to a stator core of a semi-closed slot. In this embodiment, the two helically wound sheet-like coils 3 and 3 are inserted into the stator core of the semi-closed slot in order one by one and fixed. Therefore, four layers of coil sides 10a, 10b, 10a, 10b are stacked in the slot.

  As shown in FIG. 5A, when the coil side portions 10a and 10b pass through the slot opening 41, only the coil side portions 10a and 10b are rotated by approximately 90 degrees in the thickness direction of the helically wound sheet-like coil 3. Let Then, the coil side portion 10a on the lower layer side is moved in the slot direction and inserted into the slot. When the lower coil side 10a is inserted into the slot, the upper coil side 10b is moved over the slot opening 41, and the upper coil side 10b is inserted into the slot. After the coil side portions 10a and 10b have passed through the slot opening 41, the coil side portions 10a and 10b are rotated approximately 90 degrees in the direction opposite to the rotation direction described above, and are arranged on the slot bottom portion 42. Thereby, one helical winding sheet-like coil 3 is arranged in the slot.

  Next, the second helically wound sheet-like coil 3 is inserted into the slot. As shown in FIG. 6B, when the coil side portions 10a and 10b pass through the slot opening 41 as in the first sheet, only the coil side portions 10a and 10b are made thicker than the helical wound sheet coil 3. Rotate approximately 90 degrees in the direction. Then, the coil side portion 10a on the lower layer side is moved in the slot direction and inserted into the slot. After passing through the slot opening 41, the coil side 10a on the lower layer side is rotated approximately 90 degrees in the direction opposite to the rotation direction described above, and placed on the first helically wound sheet-like coil 3. The coil side portion 10b on the upper layer side has a small gap in the slot and cannot rotate the thin wire within the slot, so the arrangement of the thin wire is changed when passing through the slot opening 41. As shown in FIG. 2B, the thin lines are arranged in the order of thin line numbers 1 and 3 in the radial direction of the stator, and the thin line number 2 is arranged adjacent to the thin line number 3 in the circumferential direction of the stator. After the fine lines 1 and 3 pass through the slot opening 41, the fine lines 1 and 3 are rotated approximately 90 degrees in the opposite direction, and the fine lines 1 and 3 on the upper layer side are stacked at the same thin line number position as the lower layer side. Finally, the fine line number 2 is rotated approximately 90 degrees in the reverse direction and stacked at the same position of the fine line number 2 as the lower layer side.

  The upper coil side portion 10b of the second helically wound sheet-like coil 3 can be inserted into the slot by the method shown in FIG. In the method shown in FIG. 2C, the thin wire is not rotated in the thickness direction of the helically wound sheet-like coil 3. After the fine wires No. 1 and No. 3 arranged on the side wall side of the magnetic pole tooth portion 40 pass through the slot openings 41 and are stacked in the slots, the remaining fine wires No. 2 are inserted into the slots. Stack. The same can be said for the case where the stacking order of the coil side portions 10a and 10b is reversed.

  Further, in the present embodiment, the thin parallel wires are fixed to each other in the vicinity of the bent portions 21a and 21b of the coil end portions 20a and 20b so that the relative positional relationship can be maintained. The thin wire can be fixed by varnish impregnation, resin molding, or the like. The parallel thin wires are preferably fixed to each other at part or all of the coil ends 20a and 20b. This facilitates insertion and fixation of the coil side portions 10a and 10b into the slots. In this figure, for the sake of convenience of explanation, the parallel thin wires with three strands shown in FIG. 8 have been described. However, even if the number of fine wires increases or decreases, the thin wires can be inserted and arranged in the slots as in the case of three. it can.

  When the helically wound sheet-like coil 3 is fixed to an annular stator core having an inner rotor, first, the helically wound sheet-like coil 3 is wound up in a spiral shape and accommodated on the inner peripheral side of the stator core. The helically wound sheet-like coil 3 is attached to the stator core while being unwound from the outer peripheral side sheet. Further, when all of the spiral helical sheet-like coil 3 cannot be accommodated on the inner peripheral side of the stator core, a part or all of the spiral helical sheet-like coil cannot be accommodated from the outside of the axial end of the stator core. May be attached to the stator core while being wound in a spiral shape.

(4) Others The present invention is not limited to the embodiment described above and shown in the drawings, and can be implemented with appropriate modifications within a range not departing from the gist. Further, the present invention can be used in various rotating electric machines of a wave winding method, for example, used in a motor for a vehicle motor, a household electric appliance, or a motor for driving a general industrial machine. it can.

DESCRIPTION OF SYMBOLS 1a, 1b: Coil unit 10a, 10b: Coil side part 11a, 11b: Outward conductor part 12a, 12b: Return conductor part 20a, 20b: Coil end part 21a, 21b: Bending part 3: Helical winding sheet coil 4a, 4b: Coil elements 5U1, 5U2, 5V1, 5V2, 5W1, 5W2: Phase unit coils 6U, 6V, 6W: Phase coils

Claims (6)

A coil side portion composed of a forward conductor portion and a return conductor portion that are alternately inserted into each slot of the stator core formed in an annular shape, and the forward conductor portion and the return conductor portion formed integrally with the coil side portion. A coil coil having a coil end connected to the same side end, and a helically wound sheet-like coil that is helically connected to form a wave winding configuration, is a motor coil wound in the radial direction of the stator core. And
The helical wound sheet-like coil is formed in two layers by laminating the coil side portions in the sheet thickness direction ,
The coil end portion is connected to the forward conductor portion and the return conductor portion arranged in different layers of the two layers in order in a wave winding direction to form a coil element,
A pair of coil elements adjacent to each other in the same slot, and a pair of coil units connected in the moving direction of the mover magnetic pole every two magnetic pole pitches are connected in series to form a phase unit coil. Forming,
The phase unit coils of different phase in electromagnetic phase are connected in series ,
The stator core includes the helically wound sheet-like coil on the radially inner peripheral side,
The helically wound sheet-like coil is wound inward in the radial direction, which is a direction from the slot bottom side of the stator core toward the slot opening side, so as to circulate in multiple directions along the circumferential direction of the stator core. ,
The helical winding sheet-like coil starting from the coil terminal portion is attached to the stator core so that the winding direction viewed from the coil terminal portion take-out side in the motor rotation axis direction is opposite to the helical winding direction. Motor coil. A coil side portion composed of a forward conductor portion and a return conductor portion that are alternately inserted into each slot of the stator core formed in an annular shape, and the forward conductor portion and the return conductor portion formed integrally with the coil side portion. A coil coil having a coil end connected to the same side end, and a helically wound sheet-like coil that is helically connected to form a wave winding configuration, is a motor coil wound in the radial direction of the stator core. And
  The helical wound sheet-like coil is formed in two layers by laminating the coil side portions in the sheet thickness direction,
  The coil end portion is connected to the forward conductor portion and the return conductor portion arranged in different layers of the two layers in order in a wave winding direction to form a coil element,
  A pair of coil elements adjacent to each other in the same slot, and a pair of coil units connected in the moving direction of the mover magnetic pole every two magnetic pole pitches are connected in series to form a phase unit coil. Forming,
  The phase unit coils of different phase in electromagnetic phase are connected in series,
  The stator core includes the helically wound sheet-like coil on the radially outer peripheral side,
  The helically wound sheet-like coil is wound toward the radially outer side, which is a direction from the slot bottom side of the stator core toward the slot opening side, so as to circulate in multiple directions along the circumferential direction of the stator core. ,
  The helical winding sheet-like coil starting from the coil terminal portion is attached to the stator core so that the winding direction viewed from the coil terminal portion take-out side in the motor rotation axis direction is the same direction as the helical winding direction. Motor coil. 3. The motor coil according to claim 1, wherein the helically wound sheet-like coil is spaced between adjacent coil sides in the moving direction of the mover magnetic pole so as to accommodate the magnetic pole teeth of the stator core. . The motor coil according to any one of claims 1 to 3, wherein the helically wound sheet-like coil is composed of parallel thin wires in which the coil unit has a plurality of thin wires arranged in parallel. The motor coil according to claim 4, wherein the helically wound sheet-like coil is wound so that the thin wires do not intersect each other. At least one of the coil side pitch, the height of the coil end, and the cross-sectional shape of the coil side is different for each mounting circumference to the stator core,
The motor coil according to any one of claims 1 to 5, wherein a cross-sectional shape of the coil end portion has a common shape portion between the coil units .

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