JP2010130842A - Stator core and stator core with coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator core wherein the coil end is formed more compact, and also to provide a stator core with a coil in which the stator core is inserted into the coil. <P>SOLUTION: A stator core 10 includes a cylindrical wall portion 11 formed by stacking a plurality of electromagnetic steel plates 14; a plurality of teeth 12 formed at predetermined intervals in a salient manner from the inner periphery or outer periphery of the cylindrical wall portion; and slots 13, formed between these teeth. Corner portions 12a of end faces on both sides of each of the teeth 12 and corner portions 11a of end faces in the back of each slot are formed in a curved surface or in a shape chamfered in a tapered manner by stacking the electromagnetic steel plates while gradually reducing the width toward openings on both end faces of each slot. A stator core with a coil is such that an insulation layer is formed on the inner periphery of each slot of the stator core and coils of three phases are inserted into the slots so that the coil ends of the coils may overlap preferably helically when seen from the end face direction of the stator core. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stator core used in a rotating electrical machine such as a motor and a stator core with a coil formed by inserting a coil into the stator core.

    Conventionally, in order to increase the capacity while reducing the size of the motor, the portion (coil end) protruding from the core end face of the coil inserted into the stator core is made as compact as possible to increase the magnetic flux density that contributes to motor torque generation. Various ideas have been made.

  As one of such contrivances, Patent Document 1 listed below is a stator core (stator) configured by laminating a plurality of electromagnetic steel sheets, and has a width along the circumferential direction of the iron core portion constituting the teeth. A stator core has been proposed that decreases in the direction of the end face and has rounded shoulders on the teeth. When this stator core is used, the winding and the insulation coating layer of the winding are prevented from being damaged, and the space formed between the stator core and the winding transition portion is reduced to reduce the motor torque. It is described that the magnetic flux density contributing to generation can be increased.

  On the other hand, in Patent Document 2 below, in a stator winding method for a multi-phase rotating machine in which a coil of each phase is inserted into a slot of a stator core by wave winding, a plurality of conductors constituting the coils of each phase are provided. A stator winding method for a multi-phase rotating machine is disclosed, in which split coils are formed separately, and these split coils are inserted into the slots sequentially in parallel with each phase. A motor in which a coil is wound with such a wave winding has a smaller inductance, a better response of the motor output to a change in drive current, and a current fluctuation is smaller than that of a lap winding motor in which a loop coil is inserted. It is said that there are advantages such as being small.

Patent Documents 3 and 4 listed below disclose a coil insertion device that inserts the wave winding coil as described above into a stator core. In the coil winding and insertion operation, the wave winding coil has an excellent feature that a plurality of poles are wound at the same time, and there is no need for a jumper wire that connects the loop coils.
JP 2005-348553 A JP-A-7-163074 Japanese Patent No. 2513351 Japanese Patent No. 2541381

  In the stator core described in Patent Document 1, since both shoulder portions of the teeth are rounded, the adhesion at the contact portion between the coil and both shoulder portions of the teeth is improved, but the radial direction of the stator core It was difficult to make the coil ends that overlap each other into a compact shape. In particular, when a wave winding coil as described in the above Patent Documents 2 to 4 is inserted, the performance deteriorates due to variations in the coil ends, so that the coil ends can be formed in close contact with the stator core. It was requested.

  Therefore, the objective of this invention is providing the stator core with a coil formed by inserting a coil in the stator core which can make a coil end more compact shape, and this stator core.

  In order to achieve the above object, a stator core of the present invention includes a cylindrical wall portion formed by laminating a plurality of electromagnetic steel plates, and a plurality of protrusions projecting at predetermined intervals from the inner periphery or outer periphery of the cylindrical wall portion. In a stator core having teeth and slots formed between the teeth, both side end face corners of the teeth and rear end face corners of the slots are widened toward the end face side opening of the slot. By gradually reducing the thickness of the layers, a curved surface or a tapered shape is formed.

  According to the above invention, not only the corners on both sides of the teeth but also the corners on the back end of the slot are curved or tapered, so that the coil ends are arranged in the radial direction of the stator core. When overlapping, the outer coil end can be moved outwardly in a state of being in close contact with the end face of the stator core along the curved or tapered chamfered portion formed at the corner of the back end face of the slot. The end can be made more compact.

  A stator core with a coil according to the present invention is characterized in that an insulating layer is provided on the inner periphery of the slot of the stator core according to claim 1 and a coil is inserted into the slot.

  According to the above invention, since the stator core has the shape described above, the outer coil end can be brought outward in close contact with the end face of the stator core, so that the coil end can be made more compact. .

  In one aspect of the stator core with a coil according to the present invention, it is inserted from one end face of the slot, inserted from the other end face, and then inserted from the other end face of the previous slot by a number determined according to the number of poles. Thus, it is preferable that a three-phase coil that progresses in a waveform is inserted into the slot by repeating the insertion from one end face.

  According to the above aspect, since a so-called wave winding coil can be inserted, a motor having a small inductance can be obtained.

  In another aspect of the stator core with a coil according to the present invention, the coil is composed of a three-phase coil having a loop shape formed for each pole, and both sides of each coil are inserted between predetermined slots. Is preferred.

  Also in this aspect, the coil end can be made compact by the stator core having the shape described above.

  In the present invention, it is preferable that the coil is inserted into the slot so that the coil ends of the coils overlap in a spiral shape when viewed from the end face direction of the stator core.

  In this aspect, the coil end becomes more compact, and there is no variation in characteristics in each phase, so that a motor with excellent characteristics can be made.

  In a further preferred aspect of the present invention, the coil comprises a coil that travels in parallel with a plurality of conducting wires.

  According to the said aspect, since resistance value can be made small by sending an electric current through several conducting wire in parallel, even if it is a comparatively low voltage power supply, a high output can be obtained by making a big electric current flow.

  According to the stator core of the present invention, not only the corners on both sides of the teeth but also the corners on the back end of the slot have a curved or tapered chamfered shape, so that the coil end is more compact. Can be.

  Moreover, according to the stator core with a coil of the present invention, the coil end is brought into close contact with the stator core and becomes compact, so that a motor having excellent characteristics can be manufactured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 5 show an embodiment of a stator core according to the present invention. As shown in FIG. 1, the stator core 10 has a plurality of, in the case of this embodiment, 36 teeth (teeth) 12 formed on the inner periphery of a cylindrical main body 11, and the teeth 12 are interposed between the teeth 12. Is formed with a slot 13 for inserting a coil. 2 indicates a space in which the coil is inserted, and 15 indicates a wedge (insulating sheet) inserted in the slot 13 so as to close the inner peripheral side opening of the teeth 12 after the coil is inserted. Show.

  As shown in FIGS. 2 to 5, the stator core 10 is formed by laminating a plurality of electromagnetic steel plates 14. In this case, the both end face corners 12a of the teeth 12 are chamfered in a curved shape or a taper shape by laminating the electromagnetic steel sheets 14 gradually decreasing toward the opening on the end face side of the slot 13. It has a shape (see FIG. 3).

  Further, in the rear end surface corner portion 11a of the slot 13, by laminating the electromagnetic steel sheet 14 with gradually decreasing the radial width toward the end surface side opening portion of the slot 13, it is similarly curved or tapered. It has a chamfered shape (see FIG. 4).

  As a result, the inner periphery of the opening on the end surface side of the slot 13 has a curved surface or a tapered chamfered shape on both the side end surface corner portions 12a of the teeth 12 and the rear end surface corner portion 11a of the slot 13. (See FIG. 5).

  6 to 8 show an embodiment of a stator core with a coil according to the present invention, in which three-phase wave coils CU, CV, and CW are inserted into the stator core 10. In FIG. 6, the numbers given to the slots are numbers indicating the order of the slots given for convenience. In the present specification, the slot numbers are described in parentheses so as not to be confused with the numbers indicating the respective members.

  An insulating layer (not shown) is formed in advance on the inner peripheral surface of the slot 13 of the stator core 10. As this insulating layer, an insulating coating film formed by applying a paint made of an insulating resin material, or a resin or paper covering the inner peripheral surface of the slot 13 and the end surface in the axial direction of the tooth 12 An insulating cover made of metal can be used. However, it is preferable that the insulating layer is formed along a curved or tapered chamfered shape formed on the both side end face corners 12a of the teeth 12 and the back end face corners 11a of the slots 13.

  In this embodiment, as the wave winding coils CU, CV, CW, coils (para-coil coils) in which a plurality of conductive wires are wound in parallel are used.

  In the stator core with coil 20, as shown in FIG. 6, for example, the wave winding coil CU that forms a U-phase coil has one end face of the slot (33) (in the rear side direction with respect to the paper face of FIG. 6). Is inserted from the other end face of the three slots (36), after being inserted from the other end face (end face located in the front side direction with respect to the paper surface of FIG. 6). It is inserted from the end face. Further, it is inserted from one end face of the three ahead slot (3), inserted from the other end face, and inserted into the previous slot three by one in this way, and finally one of the slots (30) is finally inserted. It is taken out from the end face.

  Similarly, the wave coil CV forming the V-phase coil is inserted from one end face of the slot (35) and inserted from the other end face, and then from the other end face of the three slots (2) ahead. Inserted and inserted from one end face. Further, it is inserted from one end face of the three ahead slot (5), inserted from the other end face, and inserted into the previous slot three by one in this way, and finally one of the slots (32) is finally inserted. It is taken out from the end face.

  Similarly, the wave winding coil CW forming the W-phase coil is inserted from one end face of the slot (1) and inserted from the other end face, and then from the other end face of the three slots (4) ahead. Inserted and inserted from one end face. The wave winding coil CW is inserted from one end face of the further three slots (7), inserted from the other end face, and sequentially inserted into the previous slot three by three, and finally the slot ( 34) is taken out from one end face.

  And in this invention, the shape of the coil end which protrudes from the both end surfaces of the stator core 10 of the said wave winding coil CU, CV, CW is formed so that it may overlap helically as shown in FIG. . That is, for example, when viewed from the end face on the paper side of FIG. 6, when the wave winding coil CU is inserted from a predetermined slot, it is drawn from the outer peripheral side of the coil end of the wave winding coil CV and inserted into the third slot. When inserted, it is inserted into the inner peripheral side of the coil end of the wave winding coil CW. Similarly, when the wave winding coil CV is inserted from a predetermined slot, it is pulled out from the outer peripheral side of the coil end of the wave winding coil CW, and when inserted into the third slot, the coil end of the wave winding coil CU Inserted on the inner circumference side. Similarly, when the wave winding coil CW is inserted from a predetermined slot, it is pulled out from the outer peripheral side of the coil end of the wave winding coil CU, and when inserted into the third slot, the coil end of the wave winding coil CV Inserted on the inner circumference side.

  In this embodiment, each of the wave winding coils CU, CV, CW is sequentially inserted into the next three slots, but how many slots are inserted according to the number of poles. For example, in the case of a two-layer 6-pole motor, five are sequentially inserted into the previous slot.

  As shown in FIGS. 6 to 8, the coil ends of the wave winding coils CU, CV, CW of each phase thus formed in a spiral shape are brought close to the outer diameter side and are formed as close as possible to the end face of the stator core 10. Is done. At this time, in the present invention, as described above, the both end face corners 12a of the teeth 12 and the back end face corners 11a of the slots 13 have a curved or tapered chamfered shape. The parts 12 a and 11 a can be prevented from coming into contact with and being damaged, and the coil end can be molded so as to be in closer contact with the end face of the stator core 10.

  Since both side end face corners 12a of the teeth 12 and the back end face corners 11a of the slots 13 are chamfered in a curved shape or a tapered shape, the coil loops when inserted into the slots of the stator core 10 are also compared. The coil end is closer to the end face of the stator core 10.

  And since the coil end of the coil of each phase is inserted into the slot 13 so as to overlap spirally when viewed from the end face direction of the stator core, the coil end becomes more compact, and variations in characteristics in each phase Less motor can be made with excellent characteristics.

  A rotating electrical machine such as a motor and a generator using the stator core 20 with a coil thus obtained reduces magnetic loss at the coil end and exhibits excellent performance.

  9 and 10 show another embodiment of a stator core according to the present invention. It should be noted that parts that are substantially the same as those of the above-described embodiment are given the same reference numerals to simplify the description.

  As shown in FIG. 9, in the stator core 10 a of this embodiment, 36 teeth 12 are formed on the outer periphery of the main body 11 in the case of this embodiment, and a coil is inserted between these teeth 12. Slot 13 is formed.

  As shown in FIG. 10, the stator core 10a is formed by laminating a plurality of electromagnetic steel plates 14 in the same manner as in the above embodiment. In this case, the both end face corners 12a of the teeth 12 are chamfered in a curved shape or a taper shape by laminating the electromagnetic steel sheets 14 gradually decreasing toward the opening on the end face side of the slot 13. It has a shape.

  Further, in the rear end surface corner portion 11a of the slot 13, by laminating the electromagnetic steel sheet 14 with gradually decreasing the radial width toward the end surface side opening portion of the slot 13, it is similarly curved or tapered. It has a chamfered shape.

  As a result, the inner periphery of the opening on the end surface side of the slot 13 has a curved surface or a tapered chamfered shape on both the side end surface corner portions 12a of the teeth 12 and the rear end surface corner portion 11a of the slot 13. .

  FIG. 11 shows another embodiment of the stator core with coils of the present invention, in which three-phase wave winding coils CU, CV, CW are inserted into the stator core 10a. In FIG. 11, the numbers assigned to the slots are numbers indicating the order of the slots assigned for convenience. In the present specification, the slot numbers are described in parentheses so as not to be confused with the numbers indicating the respective members.

  Note that an insulating layer (not shown) is formed in advance on the inner peripheral surface of the slot 13 of the stator core 10a, as in the above embodiment. As the insulating layer, the above-described insulating coating film, an insulating cover made of resin or paper, and the like can be used. In addition, it is preferable that the insulating layer is formed along a curved surface or a tapered chamfered shape formed on both side end surface corner portions 12 a of the teeth 12 and the back end surface corner portion 11 a of the slot 13.

  In the stator core 20 with a coil, as shown in FIG. 11, for example, a wave coil CU that forms a U-phase coil is provided on one end face of the slot (33) (in the back side direction with respect to the paper face of FIG. 11). Is inserted from the other end surface of the three slots (36) after being inserted from the other end surface (end surface positioned in the front side direction with respect to the paper surface of FIG. 11), It is inserted from the end face. Further, it is inserted from one end face of the three ahead slot (3), inserted from the other end face, and inserted into the previous slot three by one in this way, and finally one of the slots (30) is finally inserted. It is taken out from the end face.

  Similarly, the wave coil CV forming the V-phase coil is inserted from one end face of the slot (35) and inserted from the other end face, and then from the other end face of the three slots (2) ahead. Inserted and inserted from one end face. Further, it is inserted from one end face of the third slot (5), inserted from the other end face, and sequentially inserted into the third slot in this way, and finally one of the slots (32) is inserted. It is taken out from the end face.

  Similarly, the wave winding coil CW forming the W-phase coil is inserted from one end face of the slot (1) and inserted from the other end face, and then from the other end face of the three slots (4) ahead. Inserted and inserted from one end face. The wave winding coil CW is inserted from one end face of the further three slots (7), inserted from the other end face, and sequentially inserted into the previous slot three by three, and finally the slot ( 34) is taken out from one end face.

  And in this invention, the shape of the coil end which protrudes from the both end surfaces of the stator core 10a of the said wave winding coil CU, CV, CW is formed so that it may overlap helically, as shown in FIG. That is, for example, when viewed from the end surface on the paper side of FIG. 11, when the wave winding coil CU is inserted from a predetermined slot, it is drawn from the inner peripheral side of the coil end of the wave winding coil CW and is inserted into the third slot. When inserted, it is inserted on the outer peripheral side of the coil end of the wave winding coil CV. Similarly, when the wave winding coil CV is inserted from a predetermined slot, it is pulled out from the inner peripheral side of the coil end of the wave winding coil CU, and when it is inserted into three slots ahead, the coil end of the wave winding coil CW. It is inserted on the outer peripheral side. Similarly, when the wave winding coil CW is inserted from a predetermined slot, the coil end of the wave winding coil CU is pulled out from the inner peripheral side of the coil end of the wave winding coil CV and inserted into the third slot. It is inserted on the outer peripheral side.

  Note that the number of slots in which the wave winding coils CU, CV, and CW are sequentially inserted is determined according to the number of poles as described above.

  As shown in FIG. 11, the coil ends of the spirally wound wave coils CU, CV, and CW are respectively brought close to the outer diameter side and formed so as to be as close as possible to the end face of the stator core 10. . At this time, in the present invention, as described above, the both end face corners 12a of the teeth 12 and the back end face corners 11a of the slots 13 have a curved or tapered chamfered shape. The parts 12 a and 11 a can be prevented from coming into contact with and being damaged, and the coil end can be molded so as to be in closer contact with the end face of the stator core 10.

  Since both side end face corners 12a of the teeth 12 and the back end face corners 11a of the slots 13 are chamfered in a curved shape or a tapered shape, the coil loops when inserted into the slots of the stator core 10 are also compared. The coil end is closer to the end face of the stator core 10.

  A rotating electrical machine such as a motor and a generator using the stator core with coil 20a thus obtained has a reduced magnetic loss at the coil end and exhibits excellent performance.

  Each of the above-described embodiments shown in FIGS. 6 to 11 is applied to a wave winding coil, but the stator core of the present invention can also be applied to a normal loop winding coil. Since it is the same as the stator core shown in FIGS. 1 to 5 in each of the following embodiments, the description thereof is omitted, and only the state in which the loop winding coil is inserted will be described.

  The stator core with a coil shown in FIG. 12 is obtained by inserting a three-phase coil wound in a loop into the stator core 10 shown in FIGS. In FIG. 12, U1 to U6 are U-phase coils, W1 to W6 are W-phase coils, V1 to V6 are V-phase coils. The coil is arranged in the middle and the V-phase coil is arranged on the inner periphery.

  Even when such a coil wound in a loop is inserted by a normal method, by using the stator core 10 shown in FIGS. 1 to 5, the coil end is in close contact with the stator core and becomes compact, and each phase coil Since the end arrangement is almost completely uniform, a motor having excellent characteristics can be manufactured.

  The stator core with a coil shown in FIGS. 13 and 14 is obtained by inserting a three-phase coil wound around the stator core 10 shown in FIGS. 1 to 5 so that coil ends overlap in a spiral shape.

  As shown in FIG. 13, in each slot 13, one side of a different coil is inserted radially outward (back) and radially inward (front). For example, one slot 13a is described as “U1U12”, which means that one side of the U1 coil is inserted radially outward and one side of the U12 coil is inserted radially inward. Means. For example, when viewing the coil of U1, the other side of the coil of U1 is inserted as "V2U1" in the slot 13b that is five away from the slot 13a, that is, inward in the radial direction of the slot. In this way, each coil is inserted radially outward of one of the slots 13 on one side and radially inward of a slot five away from the other side. Thus, 12 coils each of U1 to U12 as the U phase, V1 to V12 as the V phase, and W1 to W12 as the W phase are inserted.

  And the coil end of each coil is formed so that it may mutually spirally overlap as shown in FIG. Also in this stator core with a coil, by using the stator core 10 shown in FIGS. 1 to 5, the coil end is in close contact with the stator core to be compact, and a motor having excellent characteristics can be manufactured.

It is a top view which shows one Embodiment of the stator core by this invention. It is the elements on larger scale of the stator core. It is sectional drawing along the III-III arrow line in FIG. It is sectional drawing along the IV-IV arrow line in FIG. It is a partial expansion perspective view of the stator core. It is a schematic plan view which shows one Embodiment of the stator core with a coil by this invention. It is a perspective view of the stator core with the coil. It is a front view of the stator core with the same coil. It is a top view which shows other embodiment of the stator core by this invention. It is the elements on larger scale of the stator core. It is a schematic plan view which shows other embodiment of the stator core with a coil by this invention. It is a top view which shows other embodiment of the stator core with a coil by this invention. It is explanatory drawing seen from the plane which shows other embodiment of the stator core with a coil by this invention. It is a top view of the stator core with the same coil.

Explanation of symbols

10, 10a Stator core 11 Main body 11a Back end corner 12 of slot 12 Teeth 12a End corner 13 of tooth 12 Slot 14 Magnetic steel sheet 20, 20a Stator core CU with coil U phase wave coil CV V phase wave coil CW W Phase-wound coils U1-U12 U-phase coils V1-V12 V-phase coils W1-W12 W-phase coils

Claims (6)

A cylindrical wall portion formed by laminating a plurality of electromagnetic steel plates, a plurality of teeth projecting at predetermined intervals from the inner periphery or outer periphery of the cylindrical wall portion, and a slot formed between these teeth In a stator core having
The both side end face corners of the teeth and the back end face corners of the slot are chamfered into a curved surface or a tapered shape by laminating the electromagnetic steel sheets gradually decreasing toward the end face side opening of the slot. A stator core characterized by having a curved shape.   The stator core with a coil according to claim 1, wherein an insulating layer is provided on an inner periphery of the slot of the stator core according to claim 1, and a coil is inserted into the slot.   By inserting from one end face of the slot and inserting from the other end face, and then inserting from the other end face of the previous slot and inserting from one end face by the number determined according to the number of poles. The stator core with a coil according to claim 2, wherein a three-phase coil moving in a waveform is inserted into the slot.   The stator core with a coil according to claim 2, wherein the coil is formed of a three-phase coil in a loop shape formed for each pole, and both sides of each coil are inserted between predetermined slots.   The stator core with a coil according to any one of claims 2 to 4, wherein the coil is inserted into the slot so that a coil end of each coil is spirally overlapped when viewed from an end surface direction of the stator core.   The stator core with a coil according to any one of claims 2 to 5, wherein the coil includes a coil that travels in parallel with a plurality of conductive wires.