JP4147291B2 - Electric motor stator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stator of an electric motor that forms a multiphase winding, and more particularly, to an improvement in a portion that draws in and pulls out a jumper wire that interconnects windings of the same phase.
[0002]
[Prior art]
As this kind of stator, six magnetic poles protrude radially inward, and windings are wound around these magnetic poles, and these windings are star-connected to generate a rotating magnetic field by a three-phase AC voltage. There is something to make. FIG. 5 is a connection diagram of the stator windings. In the figure, U-phase windings U1 and U2, V-phase windings V1 and V2, W-phase windings W1 and W2 are connected in parallel, and one end of these parallel connection windings are connected to each other. The other end is connected to the input terminals U, V, and W of the three-phase voltage. Hereinafter, the connection lines between the U-phase windings U1 and U2 and the input terminal U, the connection lines between the V-phase windings V1 and V2 and the input terminal V, and the W-phase windings W1 and W2 and the input terminal W The connection lines are referred to as lead wires, the connection lines connecting the ends of the U-phase windings U1, U2 to each other, the connection lines connecting the V-phase windings V1, V2 to each other, and the W-phase windings W1, W2. Connection lines that connect one end of each other to each other are referred to as crossover lines.
[0003]
FIG. 6 is a plan view of the stator core 1 viewed from the axial direction in order to explain the winding state of the windings U1, U2, V1, V2, W1, and W2 and the connection state thereof. is there. Here, the stator core 1 is provided with six magnetic poles 2U, 2V, 2W, 2U ′, 2V ′, and 2W ′ protruding radially inward. The aforementioned windings U1, V1, W1, U2, V2, and W2 are wound around these magnetic poles, respectively. In the drawing, a solid line indicates that it is disposed on the front side of the stator core 1, and a broken line indicates that it is disposed on the back side of the stator core 1.
[0004]
Among these, the conducting wire having one end connected to the input terminal U as a lead wire is wound around the magnetic pole 2U ′ to become the winding U2, and the other end is led out radially outward on the back side of the stator core 1, and the connecting wire The wire is wound around the magnetic pole 2U after being drawn approximately half a turn as 4U, drawn out to the front side of the stator core 1 as a winding U1, and connected to the input terminal U as a lead wire. Further, the lead wire having one end connected to the input terminal V as a lead wire is wound around the magnetic pole 2V to become the winding V1, and the other end is led out radially outward on the back side of the stator core 1 as a connecting wire 4V. The wire is wound around the magnetic pole 2V ′ after being drawn approximately half a circle, drawn out to the front side of the stator core 1 as a winding V2, and connected to the input terminal V as a lead wire. Similarly, a conducting wire having one end connected to the input terminal W as a lead wire is wound around the magnetic pole 2W ′ to become a winding W2, and the other end is led out radially outward on the back side of the stator core 1, The wire 4 </ b> W is routed approximately half a round, wound around the magnetic pole 2 </ b> W, drawn out as a winding W <b> 1 to the front side of the stator core 1, and connected to the input terminal W as a lead wire.
[0005]
Then, the connecting wires 4U and 4V are connected to each other by the crimp terminal 8, and the connecting wires 4U and 4W are connected to each other by the crimp terminal 8, thereby forming the star connection circuit shown in FIG.
[0006]
FIG. 7 (a) shows a stator connecting wire in which an insulating frame 3 is fitted to both ends of the stator core 1, and windings U1, U2, V1, V2, W1, W2 are wound through the insulating frame 3. It is a side view of the one end part which has arrange | positioned 4U, 4V, and 4W, FIG.7 (b), (c) is an enlarged side view of A, B each part in Fig.7 (a). Here, the insulating frame 3 is fitted to each end of the stator core 1. This insulating frame 3 has a cylindrical partition wall 9 that protrudes in the axial direction so as to partition the inside and the outside in the radial direction, and a notch is formed at each of the magnetic pole position and its intermediate portion viewed in the circumferential direction. . Of these notches, FIG. 7B shows details of the periphery of the notch 6 into which the connecting wire 4W is drawn. The connecting wire 4U is provided between the pair of protrusions 7 that restrict the movement of the wiring in the axial direction. The crossover wire 4W is drawn to the upper side in the drawing, and the crossover wire 4W is drawn inward in the radial direction through the notch 6 below the crossover wire 4U and wound around the magnetic pole 2W. FIG. 7 (c) shows a state in which the connecting wire 4 </ b> U and the connecting wire 4 </ b> V are connected by the crimp terminal 8 together with a state in which the connecting wire 4 </ b> V is pulled out from the notch 5. Here, the connecting wire 4V is drawn from the position of the magnetic pole 2V through the notch 5, and is connected to the connecting wire 4U by the crimp terminal 8 at a position corresponding to the notch between the magnetic poles.
[0007]
The crimp terminal 8 is provided with jagged teeth on its inner side, and by crimping the electric wire, it breaks through the coating of the electric wire and reaches the core wire, thereby conducting the connection between the connecting wires 4U and 4V.
[0008]
FIG. 8A is a plan view of the end portion of the lead wire as viewed from the axial direction. The magnetic poles 2U, 2V, 2W, 2U ′, 2V ′, and 2W ′ are respectively wound with windings U1, V1. , W1, U2, V2, and W2.
[0009]
Among these, the connecting wire 4U drawn out to the outside of the partition wall 9 from the winding U2 wound around the magnetic pole 2U ′ is drawn almost inside the partition wall 9 and then drawn into the inside of the partition wall 9 to form the magnetic pole as the winding U1. It is wound around 2U. Further, the connecting wire 4V drawn from the winding V1 wound around the magnetic pole 2V to the outside of the partition wall 9 is drawn almost half a circumference and then drawn into the inside of the partition wall 9 to form the winding V2 as the magnetic pole 2V ′. Wrapped in. Further, the crossover wire 4W drawn out of the partition wall 9 from the winding W2 wound around the magnetic pole 2W ′ is drawn almost half a circumference and then drawn into the inside of the partition wall 9 to form the winding W1 as the magnetic pole 2W. Wrapped in. And the connecting wires 4U and 4V are connected by the crimp terminal 8 between the magnetic poles 2V and 2U, and the connecting wires 4U and 4W are connected by the crimp terminal 8 between the magnetic poles 2U'2W.
[0010]
FIG. 8B shows a state in which the connecting wire 4U is drawn from the notch 6 formed in the partition wall 9, and the connecting wire 4U is bent inward along the side edge of the notch 6, and then the partition wall. 9 is drawn in diagonally downward in contact with the inner peripheral surface. The other connecting wires 4V and 4W are also drawn into the partition wall 9 in the same manner.
[0011]
[Problems to be solved by the invention]
In the above-described conventional motor stator, when the crossover 4U is drawn into the partition wall 9 through the notch 6 and wound around the magnetic pole 2U, as shown in FIG. In some cases, the winding start end portion 13 and the winding end end portion 14 approach each other and the insulation performance becomes insufficient. Incidentally, when the bottom of the notch 6 is dug deeper and made the same as the upper end surface of the magnetic pole 2U, the tension of the winding acts directly on the side end of the notch 6, and the wall surface of the partition wall 9 is deformed. Or it may be damaged in some cases.
[0012]
On the other hand, there are cases where the connecting wires 4U, 4V, 4W are difficult to be regularly arranged up and down in sequence. For example, as shown in FIG. In such a case, the connecting wire may cause a failure in the crimping portion.
[0013]
The present invention has been made in view of the above circumstances, and provides a stator for an electric motor that can improve reliability by removing an electrical failure factor such as an insulation failure or disconnection. Objective.
[0014]
[Means for Solving the Problems]
The invention according to claim 1
A stator core formed in a substantially cylindrical shape and having a plurality of magnetic poles protruding radially inward;
At least a part of the partition wall seen in the circumferential direction has a cylindrical partition wall that is fitted to each end of the stator core and protrudes in the axial direction so as to partition the inside and the outside in the radial direction. An insulating frame with a notch formed in the magnetic pole position;
Crossovers that have windings wound around the magnetic poles via the insulating frame, lead out power supply lead wires through the notches, and connect windings wound around the same-phase magnetic poles A stator winding that pulls out and pulls in,
A crimp terminal for connecting the crossover wires of different phases;
The lead wire is disposed at one end of the stator core, the crossover is disposed at the other end of the stator core, and the winding path of the crossover wire in one phase In the stator of the electric motor that pulls in and pulls out the connecting wire of the other phase from the notch in the middle of
In the outer region of the lower bottom edge portion of the notch of the insulating frame where the connecting wire is drawn, an overhanging portion that projects radially outward from the cylindrical outer peripheral surface is provided, and the outer edge of the upper end of the overhanging portion is provided. Forming a circumferential notch whose axial depth is approximately equal to the diameter of the winding,
And digging the lower bottom edge of the notch by a predetermined dimension from the upper end of the overhang,
The crossover wire of the other phase is moved over the upper end of the overhanging portion and drawn into the partition wall from the notch, and the crossover wire of the one phase is guided along the circumferential cutout. It is configured as a stator of an electric motor characterized by
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on a preferred embodiment shown on a screen.
[0019]
FIG. 1A is a perspective view of an insulating frame 3 constituting one embodiment of a stator of an electric motor according to the present invention, and FIG. 1B is an enlarged plan view of the insulating frame 3 viewed from the axial direction. is there. In this embodiment, the X portion in which the notch 6 for drawing in the connecting wire is formed and the Y portion in which the notch 5 for drawing out the connecting wire is formed are improved. Here, the insulating frame 3 includes six winding frames 3U, 3V, 3W, 3U ′, 3V ′, and 3W ′ protruding radially inward, and the magnetic poles 2U, 2V, 2W, and 2U ′ shown in FIG. , 2V ′, 2W ′. Among these, in the portion X, a projecting portion 11 projecting radially outward from the cylindrical outer peripheral surface, that is, the insulating frame wall surface 10 is provided in the outer region of the lower bottom edge portion of the notch 6 where the crossover is drawn. And a wall 6a is formed by digging the lower bottom edge of the notch by a predetermined dimension from the upper end of the overhanging part, and in the Y part, the side edge of the notch 5 where the connecting wire is pulled out In the outer region, a protruding portion 15 that protrudes radially outward from the insulating frame wall surface 10 and has an upper end surface as a crossing winding path is provided, and an upper end surface of the protruding portion is provided at a circumferential end away from the protruding portion. Further, a radial groove 16 deeply dug at least by the diameter of the winding is provided. Hereinafter, detailed configurations of the X part and the Y part will be described with reference to FIGS.
[0020]
2 (a) and 2 (b) are an enlarged plan view and a side view of the portion X, and FIGS. 2 (c) and 2 (d) are partial sectional views thereof. In each of these drawings, the partition wall 9 has a cylindrical outer peripheral surface, that is, an insulating frame wall surface 10, and notches 6 are respectively provided at portions corresponding to the magnetic poles 2 U, 2 V ′, 2 W of the partition wall 9. A projecting portion 11 that projects from the insulating frame wall surface 10 is provided in the radially outer region of the lower bottom edge of the notch 6. The upper end surface 11a of the overhanging portion 11 is lower than the lower end surface of the protrusion 7 adjacent to the left side of the drawing by a substantially wire diameter. A circumferential notch 12 having a depth substantially equal to the wire diameter is formed along the outer edge of the upper end of the overhanging portion 11. By forming this circumferential notch 12, an insulating wall upper end surface 11a is formed at the upper end of the overhanging portion 11, and an insulating edge lower bottom surface 11b is formed at the bottom of the circumferential notch 12.
[0021]
Moreover, the edge part of the notch 6 inside radial direction of the circumferential notch 12 is dug deeper than the insulating wall upper end surface 11a, and the recessed wall surface 6a is formed here. In addition, the protrusion 7 adjacent to the right side of the drawing with respect to the notch 6 has a tapered surface 14 at a lower portion thereof, and serves as a guide surface that determines the axial position of the crossover.
[0022]
With this configuration, for example, when a connecting wire wound from the left to the right in the drawing is drawn into the notch 6, the connecting wire runs along the lower end surface of the protrusion 7 and further on the upper end surface 11a of the insulating wall. The cutout 6 is drawn along the left edge of the drawing. Further, the connecting wire having the notch 6 as a winding path is guided by the taper surface 14 of the projection 7 positioned on the right side of the drawing in a state where the connecting wire rides on the bottom surface 11b of the insulating edge and is positioned.
[0023]
3A and 3B are an enlarged plan view and a side view of the Y portion, and FIGS. 3C, 3D and 3E are partial cross-sectional views thereof. In each of these drawings, the partition wall 9 has a cylindrical outer peripheral surface, that is, an insulating frame wall surface 10, and notches 5 are respectively provided at portions corresponding to the magnetic poles 2V and 2U′2W ′ of the partition wall 9. An overhanging portion 15 that protrudes from the insulating frame wall surface 10 is provided in the radially outer region of the lower bottom edge and the side edge of the notch 5. The upper end of the side edge portion of the overhanging portion 15 is lower than the lower end surface of the projection 7 adjacent to the left side of the drawing by the amount corresponding to the wire diameter. The upper end of the overhanging portion 15 at the left edge of the drawing is a tapered surface 14, but the upper end of the overhanging portion 15 at the right edge of the drawing is cut away radially inward, A flat upper end surface 15a is formed. A radial groove 16 having a bottom surface 16a that is dug down by an amount corresponding to the wire diameter from the upper end surface 15a is formed between the protruding portion 15 and the protrusion 7 on the right side of the drawing.
[0024]
With this configuration, for example, when the connecting wire is wound from the left to the right in the drawing, the connecting wire is guided by the tapered surface 14 of the overhanging portion 15 on the left side of the drawing so as to follow the lower end surface of the protrusion 7. Then, it rides on the upper end surface 15a of the overhanging portion 15 on the right side of the drawing and is guided by the tapered surface 14 of the projection 7 on the right side for axial positioning. On the other hand, the radial groove 16 is for pulling out the connecting wire, and its bottom surface 16a is deeper than the upper end surface 15a of the projecting portion 15 by the diameter of the wire. It is derived | led-out radially outside from the bottom of the connecting wire used as a path | route, and is wound in parallel after this.
[0025]
In FIG. 4A, the insulating frame 3 having each notch structure described above is fitted to the end of the stator core 1, and the windings U1, U2, V1, V2, W1, W2 are interposed through the insulating frame 3. In the figure, the same elements as those in FIG. 8 are denoted by the same reference numerals, and the description thereof is omitted. 4B and 4C are side views thereof, and FIGS. 4D to 4H are partial cross-sectional views thereof.
[0026]
Here, paying attention to the portion indicated by the arrow F that pulls in the U-phase connecting wire 4U, the connecting wire 4U is drawn into the partition wall 9 over the upper end surface 11a of the overhanging portion 11, and is further bent obliquely downward. And wound around the magnetic pole 2U. In this case, since it is bent obliquely downward immediately after overcoming the upper end surface 11a of the overhanging portion 11, it is bent obliquely downward immediately after riding on the lower bottom surface of the notch formed in the conventional cylindrical partition wall 9. In comparison, since the connecting wire 4U is separated from the winding end of the winding U1, the problem of the conventional device having insufficient insulation performance is solved. Further, since the connecting wire 4V is positioned in the circumferential notch 12 of the overhanging portion 11, the connecting wires 4U and 4V are routed in parallel.
[0027]
On the other hand, when focusing attention on the portion indicated by the arrow E drawn from the winding V1, the connecting wire 4U is wound along the upper end surface of the overhanging portion 15, whereas the connecting wire 4V passes through the radial groove 16 and is connected to the connecting wire 4U. It is pulled out to the lower part of 4U, and after that, the connecting wires 4U and 4V are drawn in parallel.
[0028]
Due to the configuration of the notch 5 and the notch 6 described above, the connecting wire drawn into the inside of the partition wall 9 is drawn in from the other connecting wire that is in the middle of winding this part. Since the connecting wire drawn to the outside is drawn from the bottom of the other connecting wire having this part in the middle of winding, the operation of aligning these connecting wires is repeated over the entire circumference of the insulating frame 3. As described with reference to (c), it is possible to prevent a situation in which the crossing portion of the crossover wire is crimped with the crimp terminal, thereby eliminating the cause of the failure in which the crossover wire is disconnected at the crimp portion. The
[0029]
Thus, according to the present embodiment, the insulation performance of the winding start end connected from the jumper wire to the end of the winding can be improved, and the jumper wire can be securely fixed between the protrusions. Since the two crossovers do not intersect vertically, there is no disconnection when connecting the crimping terminal at the neutral point.
[0030]
In the above embodiment, the stator having six magnetic poles has been described. However, the present invention is not limited to this, and the number of magnetic poles is smaller or larger. It can also be applied to.
[0031]
Moreover, although the said embodiment demonstrated what the partition wall 9 of the stator core 1 and the insulation frame 3 was formed in the cylindrical shape, the cylindrical shape said to this invention is rounded off the corner | angular of a polygon, and is substantially It is used in the meaning including what was formed into a cylindrical shape.
[0032]
【The invention's effect】
As is apparent from the above description, according to the present invention, a stator for an electric motor that can improve reliability can be obtained by a configuration that eliminates electrical failure factors such as insulation failure and disconnection.
[Brief description of the drawings]
FIG. 1 is a perspective view of an insulating frame constituting an embodiment of a stator of an electric motor according to the present invention and an enlarged plan view of the insulating frame as viewed from an axial direction.
2 is a partially enlarged plan view and a side view of the insulating frame shown in FIG. 1, and a partial cross-sectional view thereof.
3 is a partially enlarged plan view and a side view of the insulating frame shown in FIG. 1, and a partial cross-sectional view thereof.
4 is a plan view, a partial side view, and a partial cross-sectional view of a winding mounted on the insulating frame shown in FIG. 1. FIG.
FIG. 5 is a wiring diagram of a stator winding of an electric motor forming a multiphase winding.
6 is a plan view of the stator core as viewed from the axial direction in order to explain the winding state of the winding shown in FIG. 5 and the connection state thereof with respect to the stator core. FIG.
7 is a side view in which a winding is wound around the stator core shown in FIG. 6 and a partially enlarged side view thereof. FIG.
8 is a plan view of the stator core shown in FIG. 7 as viewed from the axial direction at the lead wire arrangement end and a partially enlarged plan view thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stator iron core 2U, 2V, 2W, 2U ', 2V', 2W 'Magnetic pole 3 Insulation frame 4U, 4V, 4W Crossover wire 5, 6 Notch 6a Recessed wall surface 7, 17 Protrusion 8 Crimp terminal 9 Partition wall 10 Insulation Frame wall surface 11 Overhang portion 12 Circumferential cutout 14 Tapered surface 15 Overhang portion 16 Radial grooves U, V, W Input terminal

Claims (3)

A stator core formed in a substantially cylindrical shape and having a plurality of magnetic poles protruding radially inward;
At least a part of the partition wall seen in the circumferential direction has a cylindrical partition wall that is fitted to each end of the stator core and protrudes in the axial direction so as to partition the inside and the outside in the radial direction. An insulating frame with a notch formed in the magnetic pole position;
Crossovers that have windings wound around the magnetic poles via the insulating frame, lead out power supply lead wires through the notches, and connect windings wound around the same-phase magnetic poles A stator winding that pulls out and pulls in,
A crimp terminal for connecting the crossover wires of different phases;
The lead wire is disposed at one end of the stator core, the crossover is disposed at the other end of the stator core, and the winding path of the crossover wire in one phase In the stator of the electric motor that pulls in and pulls out the connecting wire of the other phase from the notch in the middle of
In the outer region of the lower bottom edge portion of the notch of the insulating frame where the connecting wire is drawn, an overhanging portion that projects radially outward from the cylindrical outer peripheral surface is provided, and the outer edge of the upper end of the overhanging portion is provided. Forming a circumferential notch whose axial depth is approximately equal to the diameter of the winding,
And digging the lower bottom edge of the notch by a predetermined dimension from the upper end of the overhang,
The crossover wire of the other phase is moved over the upper end of the overhanging portion and drawn into the partition wall from the notch, and the crossover wire of the one phase is guided along the circumferential cutout. Electric motor stator characterized by A stator core formed in a substantially cylindrical shape and having a plurality of magnetic poles protruding radially inward;
At least a part of the partition wall seen in the circumferential direction has a cylindrical partition wall that is fitted to each end of the stator core and protrudes in the axial direction so as to partition the inside and the outside in the radial direction. An insulating frame with a notch formed in the magnetic pole position;
Crossovers that have windings wound around the magnetic poles via the insulating frame, lead out power supply lead wires through the notches, and connect windings wound around the same-phase magnetic poles A stator winding that pulls out and pulls in,
A crimp terminal for connecting the crossover wires of different phases;
The lead wire is disposed at one end of the stator core, the crossover is disposed at the other end of the stator core, and the winding path of the crossover wire in one phase In the stator of the electric motor that pulls in and pulls out the connecting wire of the other phase from the notch in the middle of
An overhanging portion that projects radially outward from the cylindrical outer peripheral surface at the outer region of at least the side edge of the notch of the insulating frame where the connecting wire is pulled out, and has an upper end surface as a winding path of the connecting wire And provided with a radial groove dug deeper at least by the diameter of the winding than the upper end surface of the overhang at the circumferential end off the overhang .
A stator for an electric motor , wherein the connecting wire of the one phase is guided in a circumferential direction along an upper end surface of the projecting portion, and the connecting wire of the other phase is pulled out through the radial groove . The stator of the electric motor according to claim 2 , wherein a peripheral edge outside the winding path of the crossover at the upper end of the overhang portion is chamfered in a tapered shape.

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