JP2007202268A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor that is simple in structure and facilitates the disposition of other electrical components. <P>SOLUTION: The motor is constructed of: a large number of teeth; field coils wound on the teeth; and slot insulating members placed between the field coils and the teeth. The teeth with the field coils wound thereon are annularly arranged. The slot insulating members are provided with a connecting wire support wall that is positioned on the inner radius side or the outer radius side of a tooth and supports a connecting wire for connecting a field coil. The connecting wire support walls are provided with multiple holding grooves that hold connecting wires inserted thereinto and are different in depth. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a crossover support structure for connecting a large number of field coils provided in an electric motor.

  A crossover support structure for connecting a field coil of an electric motor is described in, for example, Japanese Patent Application Laid-Open No. 2004-96838 (Patent Document 1).

  The electric motor shown here is provided with a jumper winding pin, a winding start curl pin, and a winding end curl pin on the side surface portion of the stator, and the jumper wire is hooked or tangled on these pins. In this way, the crossing line is held and twisted.

  In addition, there is a crossover support structure different from that of Patent Document 1. In itself, three hook-shaped holding grooves aligned in the radial direction are provided on the outer peripheral side of the teeth, and the crossover wires corresponding to the U-phase, V-phase, and W-phase field coils are divided and put in the grooves. . In this way, the U-phase, V-phase, and W-phase connecting wires are prevented from being short-circuited.

JP 2004-96838 A

  The crossover support structure described in Patent Document 1 has a complicated structure and the crossover work is troublesome. The support structure having three hook-shaped holding grooves has a complicated structure, and the three hook-shaped holding grooves occupy a large space at the side end of the stator, making it difficult to arrange other electric components.

  In view of the above problems, an object of the present invention is to provide an electric motor that has a simple structure and allows easy placement of other electrical components.

  The present invention relates to an electric motor in which teeth, a field coil wound around the teeth, a slot insulating member interposed between the field coil and the teeth, and a large number of teeth wound around the field coil are arranged in a ring shape. The slot insulation member is provided with a crossover support wall, which is located on the inner peripheral side or the outer peripheral side of the teeth, and supports the crossover connecting the field coil, and holds the crossover inserted and has a plurality of different depths. The holding groove is provided on the crossover support wall.

  According to the present invention, it is possible to provide an electric motor that has a simple structure and facilitates the placement of other electrical components.

  Embodiments of the present invention will be described with reference to the drawings.

  First, the structure of the electric motor and the support structure for the crossover will be described with reference to FIGS.

  FIG. 1 shows a stator 1 of a permanent magnet motor. A stator (not shown) is placed inside the stator 1. The permanent magnet motor is a so-called inner rotor type. The rotor includes a field magnetic pole formed of a large number of permanent magnets on the outer periphery.

  When the rotor is located outside the stator, an outer rotor type electric motor is obtained.

  The stator 1 is formed by annularly connecting a large number of divided stator cores 2 with an annular connecting yoke 3.

  The stator core 2 is formed by laminating electromagnetic steel plates as shown in FIGS. Stator core 2 has teeth 4. The teeth 4 have a yoke piece 5 on the outer peripheral side. The teeth 4 have a tooth tip enlarged portion 6 on the inner peripheral side. The yoke piece 5 has a dovetail 7 on the outer peripheral side.

  The slot insulating member 8 is provided on the teeth 4 of the stator core 2. The field coil 9 is wound around the teeth 4. The slot insulating member 8 is interposed between the tooth 4 and the field coil 9.

  The slot insulating member 8 is divided into upper and lower parts. The upper slot insulating member piece and the lower slot insulating member piece are vertically attached to the tooth 4. The field coil 9 is wound around the teeth 4 with the slot insulating member 8 covered.

  The slot insulating member can be integrally molded with the teeth 4. Since the slot insulating member 8 divided into the upper part and the lower part does not require a mold or molding work for integral molding, the productivity is good. Further, since there is no tooth 4 having a large heat capacity, there are few defects during molding.

  The winding rods 20 and 21 are provided integrally with the slot insulating member 8. The winding rod 20 is positioned on the inner peripheral side of the tooth 4, and the winding rod 21 is positioned on the outer peripheral side of the tooth 4. Since the winding rods 20 and 21 are provided, many field coils 9 can be wound without being collapsed.

  Since the yoke piece 5 is in a straight line during winding, the gap between the teeth 4 at the time of the winding machine can be increased, so that aligned winding is performed better.

  The twelve stator cores 2 around which the field coils are wound are arranged in a ring shape in the molding die. At this time, the adjacent yoke pieces 5 are arranged so that the end faces of each other are joined without a gap. Then, the powder iron core is poured into a molding die and heated and cured to form the connecting yoke 3.

  As a result, the 12 stator cores 2 that have been divided are joined together by the connecting yoke 3 to form one stator 1. In the case of a dust core without a resin binder, the magnetic flux density is high, but the bending strength is small, so it cannot be used as a structural member as it is, so the use of a dust core with a resin binder reduces the magnetic flux density by volume. The structural part of the attachment part was formed by covering.

  Since the dovetail 7 of the yoke piece 5 is molded integrally with the connecting yoke 3, the divided stator core 2 is strongly coupled. Since the yoke 3 is molded so that the connection yoke 3 covers the vicinity of the outer periphery on both side surfaces, the coupling of the stator core 2 is further strengthened.

  Adjacent yoke pieces 5 join the end faces of each other without gaps, so that there is little magnetic resistance and good magnetic flux flow. Further, since the connecting yoke 3 made of a dust core is present on the outer periphery of the yoke piece 5, the magnetic path is increased and the flow of magnetic flux is further improved.

  The dust core of the material used for the connecting yoke 3 is a mixture of iron powder particles and a resin binder. The resin binder uses a thermosetting resin. The powder iron core injected into the molding die is cured by heating to form the strongly connected connecting yoke 3.

  The crossover support wall 25 is provided in the slot insulating member 8. The connecting wire support wall 25 holds the connecting wire 26 of the field coil 9. The connecting wire 26 is a wire that connects between the wound field coils 9.

  The crossover support wall 25 is provided on the winding rod 21 located on the outer peripheral side of the tooth 4. The crossover support wall 25 is formed so as to extend the tip of the winding rod 21. In the outer rotor type electric motor different from this embodiment, the crossover support wall is provided on the winding rod 20 located on the inner peripheral side of the tooth 4.

  The holding grooves 27, 28, and 29 are provided on the crossover support wall 25. The crossover 26 is inserted and held in the holding grooves 27, 28, and 29. A deep retaining groove 27 deeply cut out from the tip of the crossover support wall 25, a middle retaining groove 28, and a shallow retaining groove 29 are provided.

  As shown in FIG. 5, the three types of holding grooves 27, 28, and 29 having different depths are provided symmetrically across an imaginary line 40 that runs vertically in the center of the tooth 4. A holding groove 29 with a shallow depth is disposed closer to the imaginary line 40 with the holding groove 28 having a middle depth in between, and a holding groove 27 with a deeper depth is disposed away from the imaginary line 40.

  In this embodiment, three types of holding grooves 27, 28, 29 are provided in both the upper and lower slot insulating member pieces. The same slot insulating member piece can be used for both the upper and lower sides, which is advantageous in terms of productivity.

  The three types of holding grooves can be used to hold the crossover with only one of the slot insulating member pieces, but since two types of slot insulating member pieces are used, it is disadvantageous in terms of productivity. Become.

  Crossover wiring will be described with reference to FIGS. 1 to 4 and FIGS. 6 to 8.

  First, the entire connection will be described with reference to the connection diagram of FIG.

  The field coils shown in (1) to (12) of FIG. 8 correspond to the field coils of (1) to (12) shown in FIG. (1), (4), (7), (10) are U-phase field coils. (2), (5), (8), (11) are V-phase field coils. (3), (6), (9), (12) are W-phase field coils.

  The field coils of each phase are connected in series via a jumper wire. One terminal of the field coil of (1) is in the U phase of the power supply terminal 41, one terminal of the field coil of (2) is in the V phase of the power supply terminal 41, and the field coil of (3). Is connected to the W phase of the power supply terminal 41.

One of the terminals of the field coils (10), (11), and (12) is a neutral point terminal 4 respectively.
2 is connected.

  As shown in FIG. 1, the power supply terminal 41 and the neutral point terminal 42 are collectively provided on one side of the stator core 2.

  FIG. 6 shows the actual wiring in which the jumper wires are arranged only on the power supply terminal or neutral point terminal side.

  First, the wiring of the connecting wire of the field coil belonging to the U phase will be described.

The connecting wire 26 -A of the field coil 9 is inserted and held in a holding groove 27 (deep groove) on the left side of the connecting wire support wall 25. Further, the end of the extended connecting line 26 -A is connected and locked to the U phase of the power supply terminal 41.
(1) The other connecting wire 26 -B of the field coil 9 is inserted and held in the holding groove 27 (deep groove) on the right side of the connecting wire support wall 25. Further, the crossover line 26 -B extends along the back side of the crossover support wall 25 and (4) comes to the crossover support wall 25 of the field coil 9.

  Here, the crossover wire 26 -B is inserted and held in the holding groove 27 (deep groove) on the left side of the crossover support wall 25, bent to the front side, and (4) connected to the field coil 9. (4) The other connecting wire 26 -B of the field coil 9 is inserted and held in the holding groove 27 (deep groove) on the right side of the connecting wire support wall 25 corresponding to (4) the field coil 9 to support the connecting wire. Go around the back of the wall 25.

  Then, the connecting wire 26-B crosses (7) the field coil 9 and (10) the field coil 9 in the manner described above. (10) The jumper wire 26 -B coming out from the other side of the field coil 9 is inserted and held in the holding groove 27 (deep groove) on the right side of the jumper wire support wall 25 and goes around the back surface of the jumper wire support wall 25.

  Further, the connecting wire 26 -B extending so as to crawl along the back surface of the connecting wire support wall 25 is (12) a holding groove 27 (deep groove) on the right side of the connecting wire support wall 25 corresponding to the field coil 9. Insertion is held. Here, the connecting wire 26 -B bent to the front side is connected and locked to the U phase of the neutral point terminal 42.

  As described above, all of the connecting wires of (1) field coil 9, (4) field coil 9, (7) field coil 9, and (10) field coil 9 belonging to the U phase are supported by connecting wires. The wiring is inserted and held in the holding groove 27 at a deep depth of the wall 25.

  Next, the wiring of the field coil belonging to the V phase will be described.

  One of the connecting wires 26 -C of the field coil 9 is inserted and held in a holding groove 28 (a groove having a middle depth) on the left side of the connecting wire support wall 25. Further, the leading end of the extended connecting line 26 -C is connected and locked to the U phase of the power supply terminal 41.

  (2) The other jumper wire 26 -D of the field coil 9 is inserted and held in the holding groove 28 (groove having a middle depth) on the right side of the jumper wire support wall 25, and the back surface side of the jumper wire support wall 25. Turn it back on. The connecting wire 26-D extends to the (5) field coil 9, (8) field coil 9, and (11) field coil 9 in the same manner as the V-phase connecting wire described above.

  (11) The connecting wire 26 -D of the field coil 9 is inserted and held in the holding groove 28 (groove having a middle depth) on the right side of the connecting wire support wall 25 and is turned to the back side of the connecting wire support wall 25. Re-insert. (12) After being inserted and held in the holding groove 28 on the right side of the crossover support wall 25 corresponding to the field coil 9 (medium depth groove), the crossover 26-D is connected to the neutral point terminal 42. It is connected and locked to the V phase.

  As described above, the crossover wires of (2) field coil 9, (5) field coil 9, (8) field coil 9, and (11) field coil 9 belonging to the V phase are all crossover support walls. 25 is inserted into and held in the holding groove 28 having a middle depth.

  Next, the wiring of the field coil belonging to the W phase will be described.

  (3) One connecting wire 26 -E of the field coil 9 is inserted and held in a holding groove 29 (shallow groove) on the left side of the connecting wire support wall 25. Further, the leading side of the extended connecting wire 26 -E is connected and locked to the W phase of the power supply terminal 41.

  (3) The other connecting wire 26 -F of the field coil 9 is inserted and held in the holding groove 29 (shallow groove) on the right side of the connecting wire support wall 25, and is turned around to the back surface side of the connecting wire support wall 25. . The connecting wire 26-F passes over (6) field coil 9, (9) field coil 9, and (12) field coil 9 in the same manner as the U-phase connecting wire described above.

  (12) The connecting wire 26 -F of the field coil 9 is inserted and held in the holding groove 28 (groove having a middle depth) on the right side of the connecting wire support wall 25 and then connected to the W phase of the neutral point terminal 42. Locked.

  As described above, the crossover wires of (3) field coil 9, (6) field coil 9, (9) field coil 9, and (12) field coil 9 belonging to the W phase are all crossover support walls. Wiring is carried out by being inserted and held in the holding groove 28 having a shallow depth of 25.

  As described above, the connecting wires of the field coils belonging to the U phase, the V phase, and the W phase are inserted and held in the holding grooves of the connecting wire support wall 25 and wired so as to crawl along the connecting wire support wall 25. In this wiring, since the depth of the holding groove is changed corresponding to the U phase, the V phase, and the W phase, the connecting wires of the respective phases are wired at intervals. Short-circuiting that crossover wires of different phases come into contact is prevented.

  Moreover, the wiring along the crossover support wall can be performed only by inserting and holding the crossover in the holding groove. Wiring work is easy.

  Further, since the holding grooves having different depths are provided on the crossover support wall, the configuration is simple and easy to make.

  Further, the structure provided with the crossover support wall is different from the structure provided with the three hook-shaped holding grooves described in the conventional example, and the space at the side end portion of the stator (stator) is large with the three hook-shaped holding grooves. Since the occupation is eliminated, the arrangement of other electrical components is facilitated.

  As shown in FIGS. 1 to 4, the crossover support wall 25 has a bowl-shaped groove 43 on the back surface side (opposite the field coil). It is formed so as to extend along the direction in which the annularly arranged stator cores 2 to 4 are arranged. This bowl-shaped groove 43 is used for storing a position sensor for detecting the magnetic pole position of the rotor and electrical components.

  FIG. 7 shows the actual wiring in which the connecting wires are laid using the lower connecting wire support wall on which the power supply terminals and the neutral point terminals are not placed.

  (3) Field coil 9, (6) Field coil 9, (9) Field coil 9, (12) Field coil 9 are partly or wholly used by using the lower connecting wire support wall 25. The crossover wire is wired.

  The wiring shown in FIG. 7 or FIG. 6 can be selected depending on the arrangement of the electrical components installed in the electric motor.

  The winding of the field coil will be described.

  As shown in FIG. 6, the stator cores are lined up by being supported by the winding hire so that they are lined up straight. The winding of the (1) field coil 9, (4) field coil 9, (7) field coil 9, (10) field coil 9 belonging to the U-phase It is performed sequentially while inserting and holding each time. After the field coil belonging to the U phase is wound, the V phase and the W phase are sequentially wound. In this way, winding is performed.

It is a figure concerning the Example of this invention, and is the figure which looked at the inside of an electric motor from the side surface side. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 according to the embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line BB in FIG. 1 according to the embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line CC of FIG. 1 according to the embodiment of the present invention. FIG. 5 is a single-part view of a crossover support wall that does not hold a crossover, according to an embodiment of the present invention. It is an actual wiring diagram of the connecting wire held by the connecting wire support wall according to the embodiment of the present invention. FIG. 5 is an actual wiring diagram in which a connecting wire is held using a lower connecting wire support wall on which a power supply terminal and a neutral point terminal are not placed, according to the embodiment of the present invention. It is a connection diagram of a field coil according to the embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 4 ... Teeth, 9 ... Field coil, 8 ... Slot insulation member, 26 ... Crossover, 25 ... Crossover support wall, 27 ... Holding groove, 28 ... Holding groove, 29 ... Holding groove

Claims (12)

An electric motor in which teeth, a field coil wound around the teeth, a slot insulating member interposed between the field coils and the teeth, and a large number of the teeth around which the field coils are wound are arranged in a ring shape In
Located on the inner or outer peripheral side of the teeth, a crossover support wall for supporting a crossover connecting the field coil is provided on the slot insulating member,
An electric motor characterized in that a plurality of holding grooves that hold the connecting wire to be inserted and have different depths are provided on the connecting wire support wall. A plurality of teeth each including a tooth having a yoke piece; a field coil wound around the tooth; and a slot insulating member interposed between the field coil and the tooth. In the electric motor in which the teeth are aligned in a ring shape and the yoke part one end surfaces of the adjacent teeth are joined to each other,
The slot insulating member is provided with a crossover support wall that is located on the inner peripheral side or the outer peripheral side of the teeth and supports a crossover connecting the mutual field coils.
An electric motor characterized in that a plurality of holding grooves that hold the connecting wire to be inserted and have different depths are provided on the connecting wire support wall. The electric motor according to claim 2, wherein
An electric motor characterized in that an annular connecting yoke for connecting the yoke pieces is formed of a powdered iron core in which iron powder particles and a resin binder are mixed. The electric motor according to claim 3, wherein
The yoke piece has a dovetail on the opposite side of the teeth,
The electric motor characterized in that the dovetail is mold-bonded to a dust core. An electric motor in which teeth, a field coil wound around the teeth, a slot insulating member interposed between the field coils and the teeth, and a large number of the teeth around which the field coils are wound are arranged in a ring shape In
The field coil has a plurality of each of the U phase, the V phase, and the W phase,
Located on the inner or outer peripheral side of the teeth, a crossover support wall for supporting a crossover connecting the field coil is provided on the slot insulating member,
A plurality of holding grooves that hold the connecting wire to be inserted and have different depths are provided in the connecting wire support wall,
A plurality of the field coils for each phase are connected in series by the jumper wires, and one end of each phase is connected to a power supply terminal and the other end is connected to a neutral point terminal. In the electric motor according to any one of claims 1 to 5,
The crossover support wall has an eaves-like groove extending along the direction in which the teeth are arranged on the opposite side of the field coil. In the electric motor according to any one of claims 1 to 5,
The electric motor characterized in that the plurality of holding grooves are of three types: shallow depth, middle depth, and deep depth. The electric motor according to claim 7, wherein
The electric motor according to claim 3, wherein the three types of holding grooves are provided symmetrically across an imaginary line that runs vertically through the center of the tooth. The electric motor according to claim 8, wherein
The three types of holding grooves are arranged in such a way that a holding groove having a shallow depth is closer to the imaginary line and a holding groove having a deep depth is away from the imaginary line with a holding groove having a middle depth in between An electric motor characterized by that. In the electric motor according to any one of claims 1 to 5,
The electric motor according to claim 1, wherein the crossover support walls having the plurality of holding grooves are present on both upper and lower sides of the teeth. In the electric motor according to any one of claims 1 to 5,
2. The electric motor according to claim 1, wherein the slot insulating member is formed of two slot insulating member pieces that are vertically combined. In the electric motor according to any one of claims 1 to 5,
The slot insulating member has a winding rod that accommodates the field coil wound around the inner peripheral side and the outer peripheral side of the teeth,
An electric motor characterized in that the connecting wire support wall is formed by extending a front side of the winding rod located on the opposite side of the rotor.

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