JP2010220387A - Stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the generation of an eddy current in a coil without lowering the space factor of the coil to improve the efficiency of a motor. <P>SOLUTION: A stator includes a stator core 2 having a plurality of teeth 5, and coils 3 configured by concentratedly winding a coil line on the teeth 5. A magnetic plate 11 for easy flowing of magnetic flux is inserted between the laminated and wound coil lines 3a to 3c of the coils 3A to 3C, between the adjacent teeth 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stator that is one of constituent elements of a motor and includes a stator core and a coil provided on the stator core.

  A conventional stator includes a stator core and a coil concentratedly wound around the teeth of the stator core. A motor is configured by combining a rotor with this stator. When the motor is driven, magnetic flux leaking from the stator core may flow between adjacent teeth, and eddy current may be generated in the coil due to the leakage magnetic flux passing through the coil. The generation of this eddy current may deteriorate the efficiency of the motor.

  Therefore, in Patent Document 1 below, in order to suppress the generation of eddy currents in the coil, the conductor wire constituting the coil concentratedly wound on the teeth of the stator core is positioned at least on the coil surface side in the wound state. Disclosed is a stator in which the conductor cross-sectional area of a conducting wire is made small by forming a plurality of conducting wires that are insulated and bundled together in an electrically parallel manner, or formed narrower than the conducting wire inside the coil. Has been.

JP 2004-208464 A JP 2008-118840 A JP 2004-312928 A JP 2006-094673 A

  However, in the case of a single conductor generally used and a parallel conductor in which a plurality of conductors having a conductor area smaller than that of a general conductor are bundled, even if the total conductor cross-sectional area is the same, Due to the gaps when the wires are bundled, there is a tendency that the ratio of the conductors on the same area of the parallel conductors, that is, the “space factor” becomes small. For this reason, in the stator described in Patent Document 1, the “space factor” of the coil becomes small, and the efficiency of the motor may be reduced.

  The present invention has been made in view of the above circumstances, and the object thereof is to suppress the generation of eddy currents in the coil without reducing the coil space factor and to improve the efficiency of the motor. Is to provide a stator.

  In order to achieve the above object, the invention described in claim 1 is a stator including a stator core including a plurality of teeth, and a coil configured by stacking coil wires around the teeth by concentrated winding. The purpose is to provide magnetic flux path means for facilitating the flow of magnetic flux between coil wires stacked in the coil between matching teeth.

  According to the configuration of the present invention, the magnetic flux leaking from the stator core may flow between adjacent teeth, but the leakage magnetic flux is more likely to flow from the teeth to the magnetic flux path means than to flow from the teeth to the coil. . Further, it is not necessary to partially change the thickness of the coil wire in the coil.

  In order to achieve the above object, the invention described in claim 2 is that, in the invention described in claim 1, the magnetic flux path means is a plate-like magnetic body inserted into the gap of the coil wire. To do.

  According to the configuration of the invention described above, in addition to the operation of the first aspect, the leakage magnetic flux is more likely to flow from the tooth to the plate-like magnetic body than to flow from the tooth to the coil.

  In order to achieve the above object, according to a third aspect of the present invention, in the first aspect of the present invention, the magnetic flux path means is a projecting portion that protrudes from the inner surface of the tooth and is disposed between the coil wires. The purpose is to be.

  According to the structure of the said invention, in addition to the effect | action of Claim 1, it becomes easy to flow a convex part from a teeth rather than a leakage magnetic flux flowing in the coil from a tooth.

  In order to achieve the above object, according to a fourth aspect of the present invention, in the first aspect of the present invention, the magnetic flux path means is inserted between the coil wire between the inner surface of the tooth and the coil. It is intended to be a round bar-like magnetic body.

  According to the configuration of the invention described above, in addition to the operation of the first aspect, the magnetic flux in the round bar shape can easily flow from the tooth rather than the leakage magnetic flux flowing from the tooth into the coil.

  According to the invention described in any one of claims 1 to 4, generation of eddy current in the coil can be suppressed without lowering the space factor of the coil, and the efficiency of the motor can be improved. it can.

The perspective view which concerns on 1st Embodiment and shows a stator. The top view which concerns on 1st Embodiment and represents the part enclosed with the chain-line ellipse of FIG. The perspective view which concerns on 1st Embodiment and shows a part of coil wire of a coil notionally. The conceptual diagram which concerns on 1st Embodiment and shows the coil etc. between adjacent teeth. The conceptual diagram which concerns on 1st Embodiment and shows the coil etc. between the teeth which adjoin as comparison. The conceptual diagram which shows the coil etc. between adjacent teeth in connection with 2nd Embodiment. The conceptual diagram which shows the coil etc. between adjacent teeth concerning 3rd Embodiment. The conceptual diagram which concerns on another embodiment and shows the coil etc. between adjacent teeth. The conceptual diagram which concerns on another embodiment and shows the coil etc. between adjacent teeth.

[First Embodiment]
Hereinafter, a first embodiment in which the stator of the present invention is embodied will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a stator 1 according to this embodiment. The stator 1 is used for a motor and includes a stator core 2 and a plurality of coils 3 attached to the stator core 2.

  FIG. 2 is a plan view showing a section surrounded by a chain line ellipse S1 in FIG. FIG. 3 conceptually shows a part of the coil wire 3a of the coil 3 in a perspective view. As shown in FIGS. 1 and 2, the stator core 2 includes an annular yoke 4. Inside the yoke 4, a plurality of teeth 5 protrude toward the center and are arranged at equal angular intervals. The stator core 2 is configured by integrating a plurality of core pieces 6 in an annular shape and caulking the outer periphery with a ring 7. As shown in FIG. 2, each core piece 6 has a T shape in a plan view, and includes a yoke portion 8 constituting an annular yoke 4 and a tooth 5 protruding from the yoke portion 8. The coil 3 is attached to the teeth 5 of each core piece 6 in advance.

  In this embodiment, as shown in FIGS. 2 and 3, as the coil 3, for example, an “edgewise coil” formed by stacking copper rectangular wires in the thickness direction through a gap is used. This coil 3 has a large cross-sectional area of one coil wire 3a, and can aim for a high space factor. Further, the coil 3 has good heat transfer in copper and is excellent in heat dissipation. The coil 3 is advantageous in that the current value per copper area can be increased. Each of the coils 3 is formed by winding the coil wire 3a around a bobbin or the like and then inserting it into the teeth 5 of each core piece 6. Thereafter, a plurality of core pieces 6 fitted with the coils 3 are bundled in an annular shape and caulked with a ring 7, whereby the stator 2 including the plurality of coils 3 is configured. The plurality of coils 3 are connected to each other by wiring (not shown). As shown in FIG. 2, a slot 9 is formed between adjacent teeth 5, and a part of different coils 3 </ b> A, 3 </ b> B, 3 </ b> C attached to the adjacent teeth 5 is arranged in the slot 9.

  Next, features of this embodiment will be described in detail. FIG. 4 is a conceptual diagram showing coils 3A, 3B and the like between adjacent teeth 5 (slot 9). As shown in FIGS. 2 and 4, a part of different coils 3 </ b> A and 3 </ b> B attached to the teeth 5 of the adjacent core pieces 6 </ b> A and 6 </ b> B are positioned in one slot 9. A magnetic plate as a plate-like magnetic body which is a magnetic flux path means of the present invention for facilitating the flow of a magnetic flux between adjacent teeth 5 and between coiled wires 3a of one coil 3A. 11 is inserted and provided. The magnetic plate 11 is made of an electromagnetic steel plate, extends in the width direction of the slot 9, and is inserted between the coil wires 3b of the adjacent coils 3B. As described above, the magnetic plates 11 are provided on the coils 3A and 3B in all the slots 9 of the stator 1 as described above.

  According to the stator 1 of this embodiment described above, when the coils 3A and 3B are excited, the magnetic flux leaking from the stator core 2 may flow between the adjacent teeth 5 as indicated by broken line arrows in FIG. The leakage magnetic flux is more likely to flow from the tooth 5 through the magnetic plate 11 inserted in the gap between the coil wires 3a and 3b than from the tooth 5 through the coils 3A and 3B. For this reason, the magnetic flux flowing through the coils 3A and 3B is reduced, and the eddy current generated in the coils 3A and 3B is reduced. Further, it is not necessary to partially change the thickness of the coil wires 3a and 3b in the coils 3A and 3B. As a result, the generation of eddy currents in the coils 3A and 3B can be suppressed without reducing the space factor of the coils 3A and 3B. Moreover, the efficiency of a motor can also be improved by using the above stators 1 for a motor.

  FIG. 5 is a conceptual diagram showing coils 3A and 3B between adjacent teeth 5 when the magnetic plate 11 is not inserted between the coil wires 3a and 3b. In this field, in each of the coils 3A and 3B, there is no magnetic plate 11 in the gap between the coil wires 3a and 3b. Therefore, as shown by a broken line arrow in FIG. Eddy current may occur in the coils 3A and 3B. For this reason, the efficiency of the motor may be deteriorated by this eddy current. On the other hand, in this embodiment, the efficiency of the motor can be improved by the amount that can suppress the generation of eddy currents in the coils 3A and 3B.

[Second Embodiment]
Next, a second embodiment in which the stator of the present invention is embodied will be described in detail with reference to the drawings.

  In each embodiment described below, components equivalent to those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different points are mainly described.

  FIG. 6 is a conceptual diagram showing coils 3A, 3B and the like between adjacent teeth 5. This embodiment is different from the first embodiment in the configuration of the magnetic flux path means provided between the coiled wires 3a and 3b stacked for the coils 3A and 3B arranged in the slot 9. That is, in this embodiment, the convex part 12 which protrudes from the inner surface of the tooth 5 and is disposed between the coil wires 3a and 3b is provided as the magnetic flux path means. Each convex portion 12 has a wedge shape in plan view, and is disposed between the coil wires 3a and 3b constituting the coils 3A and 3B attached to the teeth 5 at the tips. Each convex part 12 extends in a rib shape along the height direction of the teeth 5 (the paper surface penetrating direction in FIG. 6). Each convex part 12 provided in two adjacent teeth 5 is disposed so that the tips thereof face each other.

  Therefore, according to the stator 1 of this embodiment, when the coils 3A and 3B are energized, the leakage magnetic flux is generated rather than flowing from the teeth 5 through the coils 3A and 3B as shown by broken line arrows in FIG. 5 protrudes from the inner surface of the coil 5 and easily flows through the convex portion 12 disposed between the coil wires 3a and 3b. For this reason, the magnetic flux flowing through the coils 3A and 3B is reduced, and the eddy current generated in the coils 3A and 3B is reduced. Further, it is not necessary to partially change the thickness of the coil wires 3a and 3b in the coils 3A and 3B. As a result, the generation of eddy currents in the coils 3A and 3B can be suppressed without reducing the space factor of the coils 3A and 3B. Moreover, the efficiency of a motor can be improved by using the above stators 1 for a motor.

  In this embodiment, since the convex portion 12 is formed in advance on the inner surface of the tooth 5, unlike the first embodiment, the work of inserting the magnetic body 11 between the coil wires 3a and 3b can be omitted.

[Third Embodiment]
Next, a third embodiment in which the stator of the present invention is embodied will be described in detail with reference to the drawings.

  FIG. 7 is a conceptual diagram showing coils 3A, 3B and the like between adjacent teeth 5. In this embodiment, each coil 3A, 3B arranged in the slot 9 is different from the first and second embodiments in terms of the configuration of magnetic flux path means provided between the stacked coil wires 3a, 3b. Different. That is, in this embodiment, the magnetic bar 13 is provided as a round bar-like magnetic body inserted between the coil wires 3a and 3b between the inner surface of the tooth 5 and the coils 3A and 3B as the magnetic flux path means. . Each magnetic bar 13 is formed of a wire rod made of electromagnetic steel, and is disposed between adjacent coil wires 3a and 3b constituting the coils 3A and 3B attached to the teeth 5. The magnetic bars 13 provided on the adjacent teeth 5 are arranged to face each other.

  Therefore, according to the stator 1 of this embodiment, when the coils 3A and 3B are energized, the leakage magnetic flux does not flow from the teeth 5 through the coils 3A and 3B, as shown by broken line arrows in FIG. It becomes easy to flow to the magnetic rod 13 disposed between the wires 3a and 3b. For this reason, the magnetic flux flowing through the coils 3A and 3B is reduced, and the eddy current generated in the coils 3A and 3B is reduced. Further, it is not necessary to partially change the thickness of the coil wires 3a and 3b in the coils 3A and 3B. As a result, the generation of eddy currents in the coils 3A and 3B can be suppressed without reducing the space factor of the coils 3A and 3B. Moreover, the efficiency of a motor can be improved by using the above stators 1 for a motor.

  Note that the present invention is not limited to the above-described embodiments, and a part of the configuration can be changed as appropriate without departing from the spirit of the invention.

  (1) In the first embodiment, the magnetic plate 11 to be inserted over both the adjacent coils 3A and 3B is provided. On the other hand, as shown in FIG. 8, separate magnetic plates 11A and 11B may be inserted in the adjacent coils 3A and 3B, respectively. FIG. 8 is a conceptual diagram showing the coils 3 </ b> A, 3 </ b> B, etc. between adjacent teeth 5.

  (2) In the second embodiment, the coils 3A and 3B are directly attached to the teeth 5 on which the convex portions 12 are formed. On the other hand, as shown in FIG. 9, you may comprise so that coil 3A, 3B, 3C may be mounted | worn with the insulator 14 with respect to the teeth 5 in which the convex part 12 was formed previously. FIG. 9 is a conceptual diagram showing coils 3 </ b> A to 3 </ b> C and the like between adjacent teeth 5. In this case, before attaching the coils 3 </ b> A to 3 </ b> C to the teeth 5, the insulator 14 is directly formed in advance on the teeth 5, and thereafter, the coils 3 </ b> A to 3 </ b> C are inserted into the teeth 5 from above the insulator 14. Thereby, since the convex part 12 is buried by the insulator 14, the coils 3A to 3C are not caught by the convex part 12, and the mounting of the coils 3A to 3C on the teeth 5 can be facilitated.

  The present invention can be used for a stator of a motor.

DESCRIPTION OF SYMBOLS 1 Stator 2 Stator core 3 Coil 3A Coil 3B Coil 3C Coil 3a Coil wire 3b Coil wire 3c Coil wire 5 Teeth 6 Core piece 6A Core piece 6B Core piece 6C Core piece 9 Slot 11 Magnetic plate (magnetic flux path means)
11A Magnetic plate (flux path means)
11B Magnetic plate (flux path means)
12 Convex (magnetic flux path means)
13 Magnetic bar (Flux path hand)

Claims (4)

In a stator comprising a stator core including a plurality of teeth, and a coil configured by stacking coil wires on the teeth by concentrated winding,
A stator comprising magnetic flux path means for facilitating the flow of magnetic flux between the adjacent coil teeth between the stacked coil wires of the coil. The stator according to claim 1, wherein the magnetic flux path means is a plate-like magnetic body that is inserted into a gap between the coil wires. 2. The stator according to claim 1, wherein the magnetic flux path means is a convex portion that protrudes from an inner surface of the tooth and is disposed between the coil wires. The stator according to claim 1, wherein the magnetic flux path means is a round bar-like magnetic body inserted between the coil wires between the inner surface of the teeth and the coil.

Images