JP4599854B2 - AC rotating electric machine - Google Patents

AC rotating electric machine Download PDF

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JP4599854B2
JP4599854B2 JP2004053981A JP2004053981A JP4599854B2 JP 4599854 B2 JP4599854 B2 JP 4599854B2 JP 2004053981 A JP2004053981 A JP 2004053981A JP 2004053981 A JP2004053981 A JP 2004053981A JP 4599854 B2 JP4599854 B2 JP 4599854B2
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phase
neutral point
coil windings
coil
winding
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JP2005245163A (en
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裕 川筋
信行 本多
敬次 滝澤
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トヨタ自動車株式会社
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Description

  The present invention relates to an AC rotating electric machine, and more specifically, to a multiple-phase AC rotating electric machine including a plurality of coil windings connected in parallel in each phase.

  In a multi-phase AC electric motor (AC rotating electric machine) composed of a stator and a rotor, it is necessary to electrically couple coil windings (stator windings) of each phase at a neutral point.

For example, in Patent Document 1, shaping is performed by continuously covering the entire stator winding of the coil end from the inner peripheral side to the outer peripheral side of the stator core with an adhesive tape having electrical insulating properties. The structure which protects disconnection of time etc. and ensures the electrical coupling of a neutral point is disclosed.
JP-A-6-245423 JP 2002-171708 A

  Generally, in order to ensure the electrical coupling as described above, the coil ends are integrated by crimping or the like by pressure welding, so that the physique of the coupling portion increases and the space is limited. There is a risk of trouble when it is necessary to install an AC motor.

  In particular, in an AC motor driven by an inverter with high-speed switching, a surge due to the switching operation is generated, and a high surge voltage is applied to the stator winding. For this reason, the structure which tries to relieve the surge voltage in each stator winding by connecting a plurality of stator windings in parallel in each phase of the AC motor has been attempted.

  In addition, in order to reinforce the insulation between the neutral point and other parts with the application of a high voltage, the structure corresponding to the neutral point of each stator winding having an insulating coating is further inserted into the insulating sleeve. Is also adopted.

  However, in such a configuration, when the number of parallel connection wires of the stator windings in each phase is increased to alleviate the surge voltage, the number of insulating sleeves increases accordingly. For this reason, at the neutral point, a portion where these insulating sleeves overlap is inevitably generated, and the occupied space increases. As a result, there may be a problem in the arrangement in an application where the arrangement restriction of an automobile or the like is severe.

  The present invention is for solving such problems, and an object of the present invention is to suppress a space occupied by a neutral point in an AC rotating electrical machine, particularly an AC rotating electrical machine driven by an inverter. is there.

  An AC rotating electrical machine according to the present invention is a multi-phase AC rotating electrical machine, and includes a plurality of coil windings, a stator core, and an insulating sleeve. The plurality of coil windings are connected in parallel between each phase terminal and the neutral point in each of the plurality of phases. A plurality of coil windings are wound around the stator core. The insulating sleeve is provided corresponding to each of the plurality of phases. The node portion on the neutral point side of the plurality of coil windings is arranged in contact with the winding portion of the plurality of coil windings on the stator core, and the insulating sleeve includes a plurality of coils belonging to the same phase. At least part of the node portion on the neutral point side of the winding is inserted in common, and the portion of the node portion on the neutral point side of the plurality of coil windings that is not inserted into the insulating sleeve corresponds to the same phase Arranged in close proximity to the winding portions of the plurality of windings.

  Preferably, each phase terminal is connected to an output of a corresponding phase of a multi-phase inverter device composed of a plurality of switching elements.

  Preferably, the AC rotating electric machine is mounted on an automobile.

  The multi-phase AC rotating electrical machine according to the present invention includes a plurality of coil windings connected in parallel for each phase in order to reduce a surge voltage in each coil winding, and a neutral point of the coil winding belonging to the same phase. At least a part of the node part on the side is inserted into the insulating sleeve provided corresponding to each phase, and the part of the node part on the neutral point side that is not inserted into the insulating sleeve is in the same phase. It is arranged close to the winding part of the corresponding plurality of coil windings.

  Compared with the coil windings of different phases to which AC voltages with different phases are applied, since the applied voltage is in-phase between the coil windings of the same phase, a large voltage difference is unlikely to occur. For the node on the neutral point side, only the insulation coating provided on each coil winding is applied to both the part inserted in common with the other in-phase coil windings in the insulation sleeve and the part not inserted into the insulation sleeve. Insulation can be ensured.

  Therefore, since the number of insulating sleeves and the required sleeve length can be reduced, the space occupied by the neutral point can be suppressed, and the arrangement restriction of the AC motor can be relaxed.

  In particular, in an AC rotating electrical machine that is driven to rotate by an inverter device that is prone to surge, even when the number of parallel connection of coil windings in each phase is increased to reduce surge voltage, It is possible to suppress a significant increase in the occupied space.

  Moreover, when mounting in the motor vehicle with a large restriction | limiting space restrictions, the arrangement | positioning can be made flexible by suppressing the occupation space of a neutral point.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or an equivalent part, and the description shall not be repeated in principle.

  FIG. 1 is an electric circuit diagram illustrating the configuration and power supply form of an AC rotating electrical machine according to the present invention. In FIG. 1, a three-phase AC motor 50 is shown as a typical example of a multi-phase AC rotating electric machine.

  The AC motor 50 according to the present invention is a three-phase motor including a U phase, a V phase, and a W phase, and includes phase terminals 55u, 55v, and 55w corresponding to the U phase, the V phase, and the W phase, respectively. The phase terminals 55u, 55v, 55w are electrically connected to the output terminals 25u, 25v, 25w of the inverter device 20, respectively.

  The AC motor 50 further includes coil windings 61u, 61v, 61w, 62u, 62v, and 62w. Coil windings 61 u and 62 u are connected in parallel between U-phase terminal 55 u and neutral point 60. Neutral point nodes connected to the neutral points 60 of the coil windings 61u and 62u are denoted by reference numerals 61un and 62un, respectively.

  Similarly, coil windings 61v and 62v are connected in parallel between V-phase terminal 55v and neutral point 60. Neutral point nodes 61 vn and 62 vn of coil windings 61 v and 62 v are connected to neutral point 60. Coil windings 61w and 62w are connected in parallel between W-phase terminal 55w and neutral point 60. Neutral point nodes 61wn and 62wn of coil windings 61w and 62w are connected to neutral point 60.

  Inverter device 20 includes switching elements Q1 to Q6 and diodes D1 to D6. Switching elements Q1 and Q2 constitute a U-phase arm, and are connected in series between power supply line 11 and ground line 12 from battery 10. Similarly, switching elements Q3 and Q4 constitute a V-phase arm and are connected in series between power supply line 11 and earth line 12. Further, switching elements Q5 and Q6 constitute a W-phase arm, and are connected in series between power supply line 11 and earth line 12.

  As the switching elements Q1 to Q6, for example, an IGBT (Insulated Gate Bipolar Transistor) is applied. Diodes D1-D6 are antiparallel diodes provided corresponding to switching elements Q1-Q6, respectively.

  Output terminal 25u is electrically connected to a connection node of switching elements Q1 and Q2, output terminal 25v is electrically connected to a connection node of switching elements Q3 and Q4, and output terminal 25w is connected to switching elements Q5 and Q6. It is electrically connected to the connection node.

  The inverter device 20 converts the DC input voltage supplied from the battery 10 between the power supply line 11 and the earth line 12 into a three-phase AC voltage and generates the output terminals 25u, 25v, and 25w. The AC motor 50 is rotationally driven by a three-phase AC voltage supplied from the inverter device 20.

  FIG. 2 is a schematic diagram for explaining the outer shape of the AC motor 50.

  Referring to FIG. 2, AC electric motor 50 includes a rotor 70 formed to be rotatable around rotation shaft 51 and a stator 80 provided on the outer periphery of rotor 70. The stator 80 includes a stator core 85 configured by stacking annular magnetic steel plates and a coil winding 90 wound around the stator core 85. The coil winding 90 generally represents the coil windings 61u to 61w and 62u to 62w shown in FIG. These coil windings are electrically coupled to each other at a node corresponding to the neutral point 60 shown in FIG. These neutral point nodes are arranged in contact with the coil winding 90 wound around the stator core 85 along the coil axis direction.

  Therefore, if the space occupied by the coupling node of the neutral point 60 is increased, the size of the stator portion along the motor axis direction is increased, and the arrangement thereof is restricted.

  FIG. 3 is a diagram illustrating a neutral point structure shown as a comparative example. FIG. 3 corresponds to a plan view seen from the X direction in FIG.

  Referring to FIG. 3, the neutral point nodes 61un to 61wn and 62un to 62wn of the coil winding are integrated at the neutral point 60 by caulking such as pressure welding, and electrical coupling is ensured. At this time, the neutral point nodes 61un to 61wn and 62un to 62wn are each inserted into the insulating sleeves 101 to 106 formed of an insulating member in addition to being covered with the insulating film, The insulation between other coil windings is strengthened.

  However, in the neutral point structure shown in FIG. 3, since one insulating sleeve is provided for each coil winding, a plurality of coils are provided in the vicinity of the neutral point 60 in which the coil winding is integrally accommodated. Insulating sleeves 101 to 106 must be arranged so as to overlap each other, and the occupied space is increased in the motor axial direction (the vertical direction of the paper surface).

  FIG. 4 shows a neutral point structure according to the embodiment of the present invention. FIG. 4 corresponds to a plan view seen from the X direction in FIG.

  Referring to FIG. 4, in the embodiment of the present invention, neutral point nodes 61un to 61wn and 62un to 62wn of the coil winding integrally caulked at neutral point 60 are common to each phase. Inserted into the sleeve. In FIG. 3, insulating sleeves 101 to 103 are provided corresponding to the U phase, the V phase, and the W phase, respectively.

  At least a part of the neutral point nodes 61un and 62un is inserted into the inside of the insulating sleeve 101 in common. Further, of the neutral point nodes 61un and 62un that are not inserted into the insulating sleeve 101, in accordance with the region where the U-phase coil winding (not shown) having the same phase is wound in the lower region, Arranged at the top.

  Similarly, at least a part of the neutral point nodes 61 vn and 62 vn is inserted in the inside of the insulating sleeve 102, and a V-phase coil winding (not shown) having the same phase is provided for a portion not inserted into the insulating sleeve 102. Arranged at the top of the area to be wound. Further, at least a part of the neutral point nodes 61wn and 62wn is inserted in the inside of the insulating sleeve 103, and a V-phase coil winding (not shown) of the same phase is wound at a portion not inserted in the insulating sleeve 103. Arranged at the top of the area to be turned.

  By adopting such a configuration, the number of insulating sleeves that overlap in the motor shaft direction at the neutral point 60 is reduced, so that an increase in occupied space is suppressed.

  In addition, since AC voltages with different phases are applied to coil windings of different phases, the voltage difference between these coil windings tends to be large, while the applied voltage is in-phase between coil windings of the same phase. For this reason, a large voltage difference is unlikely to occur. For this reason, with the arrangement of the neutral point node as described above, it is possible to ensure the insulation only by the insulating film provided on each coil winding even for the portion not inserted in the insulating sleeve. .

  As described above, according to the neutral point structure of the stator according to the present invention, the number of insulating sleeves and the required sleeve length can be reduced. Can be relaxed.

  The same neutral point structure can be similarly applied when the number of coil windings in each phase is increased.

  FIG. 5 is an electric circuit showing the configuration of the stator of AC electric motor 50 # in which four corresponding coil windings are connected in parallel.

Referring to FIG. 5, AC electric motor 50 # includes coil windings 61u to 61w, 62u to 62w,
63u-63w and 64u-64w. Four coil windings 61 u to 64 u are connected in parallel between U-phase terminal 55 u and neutral point 60. The neutral point nodes connected to the neutral points 60 of the coil windings 61u to 64u are indicated by reference numerals 61un to 64un, respectively.

  Similarly, the four coil windings 61v to 64v are connected in parallel between the V-phase terminal 55v and the neutral point 60. The neutral point nodes 61 vn to 64 vn of the coil windings 61 v to 64 v are connected to the neutral point 60. The coil windings 61w to 64w are connected in parallel between the W-phase terminal 55w and the neutral point 60. The neutral points 61 wn to 64 wn of the coil windings 61 w to 64 w are connected to the neutral point 60.

  FIG. 6 is a diagram for explaining a layout arrangement in the vicinity of neutral point 60 of AC electric motor 50 # shown in FIG.

  Referring to FIG. 6, the arrangement of coil windings 61u to 61w and 62u to 62w for four coil windings connected in parallel in each phase is similar to that shown in FIG. Therefore, the detailed description will not be repeated.

  Furthermore, insulating sleeves 110 to 112 are further provided for the additionally provided coil windings 63u to 63w and 64u to 64w. Insulating sleeve 110 is provided for the U phase, and corresponding neutral winding nodes 63un and 64un are inserted in common in coil windings 63u and 64u. Further, the portion of the neutral point nodes 63un and 64un that is not inserted into the insulating sleeve 110 is matched to the region where a U-phase coil winding (not shown) having the same phase is wound in the lower region thereof. Arranged at the top.

  Similarly, at least a part of the neutral point nodes 63 vn and 64 vn is inserted into the inside of the insulating sleeve 111 corresponding to the V phase in common, and the V-phase coil winding ( (Not shown) is routed at the top of the area where it is wound.

  Further, at least a part of the neutral point nodes 63wn and 64wn are inserted in common inside the insulating sleeve 112 corresponding to the W phase, and the V-phase coil winding (see FIG. (Not shown) is routed at the top of the area where it is wound.

  By adopting such a structure, regardless of the coil windings connected in parallel for each phase, the insulation reinforcement between the coil windings of the other phases can be achieved at the neutral point node of each phase coil winding. By inserting into the common insulating sleeve for the necessary part, and for the non-inserting part to the insulating sleeve, by arranging it in the upper part of the area where the coil winding of the same phase is wound, In addition to ensuring the necessary insulation at the neutral point, the space occupied by the neutral point can be reduced. As a result, the layout restrictions of the AC rotating electric machine can be relaxed.

  Note that the AC rotating electrical machine according to the present invention is suitable for mounting on a vehicle such as an automobile, which must be arranged in a narrow space such as an area below the floor.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is an electric circuit diagram explaining the structure and power supply form of an AC rotating electrical machine according to the present invention. It is the schematic explaining the external shape of the alternating current motor shown by FIG. It is a figure explaining the neutral point structure shown as a comparative example. It is a figure which shows the neutral point structure according to embodiment of this invention of the alternating current rotating electrical machine shown in FIG. It is an electric circuit diagram which shows the stator structure of the AC rotary electric machine which increased the number of coil windings of each phase. FIG. 6 is a diagram showing a neutral point structure according to the embodiment of the present invention of the AC rotating electric machine shown in FIG. 5.

Explanation of symbols

  20 Inverter device, 25u, 25v, 25w Output terminal (inverter device), 50, 50 # AC motor, 55u, 55v, 55w Each phase terminal (AC motor), 60 Neutral point, 61u, 61v, 61w, 62u, 62v 62w, 63u, 63v, 63w, 64u, 64v, 64w, 90 coil winding, 61un, 61vn, 61wn, 62un, 62vn, 62wn, 63un, 63vn, 63wn, 64un, 64vn, 64wn neutral point node, 70 rotations Child, 80 stator, 85 stator core, 101-103, 110-112 insulation sleeve, Q1-Q6 switching element

Claims (3)

  1. A multi-phase AC rotating electric machine,
    In each of the plurality of phases, a plurality of coil windings connected in parallel between each phase terminal and a neutral point;
    A stator core around which the plurality of coil windings are wound;
    An insulating sleeve provided corresponding to each of the plurality of phases,
    The node portion on the neutral point side of the plurality of coil windings is arranged in contact with the winding portion of the coil winding to the stator core,
    At least a part of the node portion on the neutral point side of the plurality of coil windings belonging to the same phase is inserted into the insulating sleeve in common,
    Of the node portions on the neutral point side of the plurality of coil windings, a portion that is not inserted into the insulating sleeve is arranged close to a winding portion of the plurality of coil windings corresponding to the same phase. AC rotating electric machine.
  2.   The AC rotating electrical machine according to claim 1, wherein each of the phase terminals is connected to an output of a corresponding phase of a multi-phase inverter device configured by a plurality of switching elements.
  3.   The AC rotating electric machine according to claim 1, wherein the AC rotating electric machine is mounted on an automobile.
JP2004053981A 2004-02-27 2004-02-27 AC rotating electric machine Expired - Fee Related JP4599854B2 (en)

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JP2004053981A JP4599854B2 (en) 2004-02-27 2004-02-27 AC rotating electric machine

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JP2019115165A (en) 2017-12-22 2019-07-11 日本電産株式会社 Stator, motor, and air blower

Citations (1)

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Publication number Priority date Publication date Assignee Title
JP2002044892A (en) * 2000-07-27 2002-02-08 Matsushita Electric Ind Co Ltd Electric motor and electric compressor mounted with this electric motor

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JPS55106440U (en) * 1979-01-22 1980-07-25
JP2602829B2 (en) * 1987-04-23 1997-04-23 株式会社日立製作所 Armature winding of rotating electric machine
JP2945227B2 (en) * 1993-01-26 1999-09-06 三菱電機株式会社 Lead wire connection device for rotating electric machine stator
JPH0984289A (en) * 1995-09-12 1997-03-28 Fuji Electric Co Ltd Insulated coil for inverter driven electric rotating machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002044892A (en) * 2000-07-27 2002-02-08 Matsushita Electric Ind Co Ltd Electric motor and electric compressor mounted with this electric motor

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