WO2016035533A1 - 回転電機のステータ、及びこれを備えた回転電機 - Google Patents
回転電機のステータ、及びこれを備えた回転電機 Download PDFInfo
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- WO2016035533A1 WO2016035533A1 PCT/JP2015/072982 JP2015072982W WO2016035533A1 WO 2016035533 A1 WO2016035533 A1 WO 2016035533A1 JP 2015072982 W JP2015072982 W JP 2015072982W WO 2016035533 A1 WO2016035533 A1 WO 2016035533A1
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- Prior art keywords
- stator
- rotor
- rotating electrical
- electrical machine
- inner diameter
- Prior art date
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/22—Notching the peripheries of circular blanks, e.g. laminations for dynamo-electric machines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Definitions
- the present invention relates to a stator for a rotating electrical machine and a rotating electrical machine including the stator.
- rotating electric machines are required to have a small size and high output.
- a rotating electric machine for example, it has a stator core having a large number of slots opened on the inner peripheral side, and a plurality of substantially U-shaped segment conductors are inserted into each slot, thereby improving the space factor and cooling. What improved the performance to improve the output is known.
- Patent Documents 1 and 2 Since the techniques of Patent Documents 1 and 2 are mainly intended for air-cooled and low-voltage (12 Vdc) vehicle AC generators, insulation by burr on the anti-connection side (segment insertion side) or connection side (anti-insertion side) Although it is only necessary to prevent destruction, in a rotating electric machine used for an electric vehicle or a hybrid electric vehicle, the voltage is as high as 150 to 300 Vdc (some of which are 600 Vdc by boosting), and a transformer such as direct liquid (for example, oil) cooling is used. Many are used in cases. Furthermore, since such a rotating electric machine has a high voltage, it is necessary to improve the insertion property of the segment coil, insulating paper, magnet, shaft, and housing by burr. Furthermore, it is necessary to prevent the core burr from falling off in terms of quality reliability.
- Patent Document 3 since the technology of Patent Document 3 is based on a rotating electrical machine with a round wire wound, the examination of the slot burr and the coil insertion direction that are most likely to cause dielectric breakdown has not been sufficiently performed. Insufficient consideration is given to a rotating electrical machine having a voltage of 150 to 300 Vdc (some of which have a voltage of 600 Vdc due to boosting) used in an electric vehicle or a hybrid electric vehicle, in which reliability is a problem.
- an object of the present invention is to provide a stator for a rotating electrical machine that is excellent in insulation and productivity, and a rotating electrical machine including the stator.
- the present application includes a plurality of means for solving the above-described problems.
- the present application includes a stator core provided with a plurality of slots, and a stator coil provided in the slots. N segment conductors (where N is a positive even number) are provided, and the stator coil is connected to the plurality of segment conductors via welds provided at the end portions of the respective segment conductors.
- stator of a rotating electrical machine in which the conductor end portion is annularly arranged in the circumferential direction at one coil end in the axial direction, and an N-row annular row is formed, the stator core on the status lot and the stator inner diameter side is punched
- the direction of the burr and the direction of the punching burr of the stator core on the stator outer diameter side are opposite to each other.
- the present invention can provide a stator for a rotating electrical machine that is excellent in insulation and productivity, and a rotating electrical machine including the stator.
- FIG. 1 It is a mimetic diagram showing the whole rotary electric machine composition concerning an embodiment of the present invention. It is a perspective view which shows the stator core of the rotary electric machine which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the electromagnetic steel plate which comprises the stator core which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the stator coil for three phases wound around a stator core. It is a perspective view which shows the stator coil of the U phase wound around a stator core. It is a perspective view which shows the stator coil of U1 phase wound around a stator core. It is a perspective view which shows the stator coil of U2 phase wound around a stator core.
- FIG. 1 It is a figure explaining the segment conductor of a stator coil, (a) is a figure which shows one segment conductor, (b) is a figure explaining coil formation by a segment conductor, (c) is arrangement
- FIG. 1 It is a top view which shows the state which inserts the stator core and rotor core of a rotary electric machine which concerns on embodiment of this invention, a permanent magnet, insulating paper, and a stator coil. It is a top view which shows the state which inserted the stator core and rotor core of the rotary electric machine which concerns on embodiment of this invention, a permanent magnet, insulating paper, and a stator coil. It is a top view which shows the state which inserts the stator core and rotor core of a rotary electric machine which concerns on the 2nd Embodiment of this invention, a permanent magnet, insulating paper, and a stator coil.
- FIG. 1 It is a top view which shows the state which inserted the stator core and rotor core of the rotary electric machine which concerns on the 2nd Embodiment of this invention, a permanent magnet, insulating paper, and a stator coil. It is a schematic diagram which shows the cross-sectional state of the stator core and rotor core of the rotary electric machine which concern on embodiment of this invention. It is a schematic diagram which shows the cross section which inserts the stator core which concerns on embodiment of this invention into a housing. The block diagram which shows the structure of the vehicle carrying the rotary electric machine by this invention.
- axial direction refers to a direction along the rotation axis of the rotating electrical machine.
- the circumferential direction refers to the direction along the rotational direction of the rotating electrical machine.
- the “radial direction” refers to a radial direction (radial direction) when the rotational axis of the rotating electrical machine is the center.
- Inner circumference side refers to the radially inner side (inner diameter side)
- outer circumference side refers to the opposite direction, that is, the radially outer side (outer diameter side).
- FIG. 1 is a cross-sectional view showing a rotating electrical machine including a stator according to the present invention.
- the rotating electrical machine 10 includes a housing 50, a stator 20, a stator core 132, a stator coil 60, and a rotor 11.
- the stator 20 is fixed to the inner peripheral side of the housing 50.
- the rotor 11 is rotatably supported on the inner peripheral side of the stator 20.
- the housing 50 constitutes an outer casing of an electric motor that is formed into a cylindrical shape by cutting an iron-based material such as carbon steel, casting of cast steel or aluminum alloy, or pressing.
- the housing 50 is also referred to as a frame or a frame.
- a liquid cooling jacket 130 is fixed to the outer peripheral side of the housing 50.
- the inner peripheral wall of the liquid cooling jacket 130 and the outer peripheral wall of the housing 50 constitute a refrigerant passage 153 of a liquid refrigerant RF such as oil, and the refrigerant passage 154 is formed so as not to leak.
- the liquid cooling jacket 130 houses the bearings 144 and 145 and is also called a bearing bracket.
- the liquid accumulated in the refrigerant (oil) storage space 150 passes through the refrigerant passage 153 and flows out from the refrigerant outlets 154 and 155 toward the stator 20 to cool the stator 20.
- the stator 20 includes a stator core 132 and a stator coil 60.
- Stator core 132 is formed by laminating thin sheets of silicon steel plates.
- the stator coil 60 is wound around a plurality of slots 15 provided on the inner peripheral portion of the stator core 132. Heat generated from the stator coil 60 is transferred to the liquid cooling jacket 130 via the stator core 132 and is radiated by the refrigerant RF flowing through the liquid cooling jacket 130.
- the rotor 11 includes a rotor core 12 and a shaft 13.
- the rotor core 12 is made by laminating thin plates of silicon steel plates.
- the shaft 13 is fixed to the center of the rotor core 12.
- the shaft 13 is rotatably held by bearings 144 and 145 attached to the liquid cooling jacket 130 and rotates at a predetermined position in the stator 20 at a position facing the stator 20.
- the rotor 11 is provided with a permanent magnet 18 and an end ring 19.
- the rotating electrical machine 10 is disposed inside a liquid cooling jacket 130, and includes a housing 50, a stator 20 having a stator core 132 fixed to the housing 50, and rotation within the stator. And a freely arranged rotor 11.
- the liquid cooling jacket 130 includes an engine case and a transmission case.
- This rotating electrical machine 10 is a three-phase synchronous motor with a built-in permanent magnet.
- the rotating electrical machine 10 operates as an electric motor that rotates the rotor 11 by supplying a three-phase alternating current to the stator coil 60 wound around the stator core 132. Further, when driven by the engine, the rotating electrical machine 10 operates as a generator and outputs three-phase AC generated power. That is, the rotating electrical machine 10 has both a function as an electric motor that generates rotational torque based on electric energy and a function as a generator that generates electric power based on mechanical energy. Functions can be used selectively.
- the stator 20 fixed to the housing 50 is fixedly held in the liquid cooling jacket 130 by fastening a flange 115 provided on the housing 50 to the liquid cooling jacket 130 with a bolt 15.
- the rotor 11 is fixed to a shaft 118 supported by bearings 144 and 145 of the liquid cooling jacket 130 and is rotatably held inside the stator core 132.
- a stator 20 that generates a rotating magnetic field, and a rotor 11 that is rotated by a magnetic action of the stator 20 and that is rotatably arranged via an inner peripheral side of the stator 20 and a gap 850 are provided.
- FIG. 2 is a perspective view showing the housing 50 and the stator 20 of the rotating electrical machine 10 according to the first embodiment of the present invention.
- the housing 50 is formed in a cylindrical shape by drawing a steel plate (such as a high-tensile steel plate) having a thickness of about 2 to 5 mm.
- the housing 50 is provided with a plurality of flanges 115 attached to the liquid cooling jacket 130.
- the plurality of flanges 115 project outward in the radial direction at the periphery of one end surface of the cylindrical housing 50.
- the flange 115 is formed by cutting away a portion other than the flange 115 at an end portion formed at the time of drawing, and is integrated with the housing 50.
- the stator 20 includes a cylindrical stator core 132 and a stator coil 60 attached to the stator core 132.
- FIG. 3 is a perspective view showing the stator core 132
- FIG. 4 is a perspective view showing the electromagnetic steel plate 133 constituting the stator core 132.
- the stator core 132 is formed such that a plurality of slots 420 parallel to the axial direction of the stator core 132 are equally spaced in the circumferential direction.
- the number of slots 420 is, for example, 72 in the present embodiment, and the stator coil 60 described above is accommodated in the slot 420.
- the inner circumferential side of each slot 420 is an opening, and the circumferential width of this opening is substantially the same as or slightly smaller than the coil mounting portion of each slot 420 to which the stator coil 60 is mounted. Yes.
- Teeth 430 are formed between the slots 420, and each tooth 430 is integrated with an annular core back 440. That is, the stator core 132 is an integrated core in which the teeth 430 and the core back 440 are integrally formed.
- the teeth 430 serve to guide the rotating magnetic field generated by the stator coil 60 to the rotor 11 and generate a rotating torque in the rotor 11.
- the stator core 132 is formed by punching a magnetic steel sheet 133 (see FIG. 4) having a thickness of about 0.05 to 1.0 mm and laminating a plurality of formed annular magnetic steel sheets 133.
- the welded portion 200 is provided in parallel to the axial direction of the stator core 132 at the outer peripheral portion of the cylindrical stator core 132 by TIG welding, laser welding, or the like. As shown in FIG. 10, the welded portion 200 is formed in a semicircular weld groove 210 provided in advance on the outer periphery of the stator core 132, and the welded portion 200 protrudes outward in the radial direction of the stator core 132. There is no.
- the stator core 132 in this embodiment includes a slot 420 of the stator core 132 and an inner diameter of the stator core 132 in the direction of sag 800 (direction of burr 810) and a sag 800 of the outer diameter of the stator core 132 (direction of burr 810). Reverse the direction. By reversing the sagging 800 direction (burr 810 direction), the insertion property of the segment conductor 28, the insulating paper 300, and the housing 50 can be improved.
- the sag 800 (burr 810) can be managed by adjusting the clearance and punching pressure between the punch 850 and the die 860 during punching. Further, a progressive die for press work or a single shot type may be used by using a die for changing the direction of the punch 850 and the die 860 in order to reverse the sagging 800 and the burr 810.
- the coil film may be damaged by being inserted from the direction of the sag 800 reversed. As a result, the insulation is improved and workability is improved.
- the burr 810 can be prevented from falling off by being attached from the direction of the sag 800 of the stator core 132. Further, since the burr 810 can be attached without a gap, the reliability is improved.
- the stator core 132 is fitted and fixed to the inside of the above-described cylindrical group 50 by shrink fitting.
- a specific assembling method for example, first, the stator core 132 is disposed, and the stator 50 is preliminarily heated and fitted with a housing 50 whose inner diameter is expanded by thermal expansion. Next, the housing 50 is cooled to contract the inner diameter, and the outer periphery of the stator core 132 is tightened by the thermal contraction.
- the stator core 132 is shrink-fitted so that the inner diameter dimension of the housing 50 is smaller than the outer diameter dimension of the stator core 132 by a predetermined value so that the stator core 132 does not idle with respect to the housing 50 due to the reaction caused by the torque of the rotor 11 during operation. Accordingly, the stator core 132 is firmly fixed in the housing 50.
- the difference between the outer diameter of the stator core 132 at normal temperature and the inner diameter of the housing 50 is referred to as a tightening allowance.
- this allowance assuming the maximum torque of the rotating electrical machine 10
- the housing 50 has a predetermined tightening.
- the stator core 132 is held by the force.
- the stator core 132 is not limited to being fitted and fixed by shrink fitting, and may be fitted and fixed to the housing 50 by press fitting.
- the stator core 132 is provided with a welded portion 200 as shown in FIG.
- the welded portion 200 connects the laminated electromagnetic steel plates 133 and suppresses deformation of the electromagnetic steel plates 133 due to the tightening force of the housing 50.
- FIG. 5 is a perspective view showing a stator coil 60 for three phases.
- FIGS. 6, 7 and 8 are perspective views showing a U-phase stator coil 60, a U1-phase stator coil 60 and a U2-phase stator coil 60 wound around the stator core 132, respectively.
- the stator coil 60 is wound in a distributed winding manner and connected in a star connection configuration.
- the distributed winding is a winding method in which the phase windings are wound around the stator core 132 so that the phase windings are accommodated in two slots 420 that are separated across the plurality of slots 420.
- distributed winding is adopted as the winding method, so that the formed magnetic flux distribution is closer to a sine wave than concentrated winding, and has a feature that reluctance torque is likely to be generated. Therefore, this rotating electrical machine 10 has improved controllability using field-weakening control and reluctance torque, and can be used over a wide rotational speed range from a low rotational speed to a high rotational speed, and is suitable for an electric vehicle. Excellent motor characteristics can be obtained.
- the stator coil 60 constitutes a three-phase star-connected phase coil, and the cross section may be round or square, but the cross section inside the slot 420 is used as effectively as possible, Since a structure that reduces the space in the slot tends to improve efficiency, a square cross section is desirable from the viewpoint of improving efficiency.
- the square shape of the cross section of the stator coil 60 may be a shape in which the circumferential direction of the stator core 132 is short and the radial direction is long, or conversely, the circumferential direction is long and the radial direction is short. Good.
- the stator coil 60 uses a rectangular wire in which the rectangular cross section of the stator coil 60 is long in the circumferential direction of the stator core 132 and short in the radial direction of the stator core 132 in each slot 420.
- the rectangular wire has an outer periphery covered with an insulating film.
- a segment conductor 28 having a substantially U shape is formed such that the apex 28C on the anti-welding side coil end 61 is a turning point.
- the non-welding side coil end 61 apex 28 ⁇ / b> C may have a substantially U shape so as to fold back the direction of the conductor.
- the shape is limited to a shape in which the apex 28C of the anti-welding side coil end 61 and the conductor skew portion 28F of the anti-welding side anti-welding side coil end 61 form a substantially triangular shape when viewed from the radial direction. Absent.
- the conductor is substantially parallel to the end surface of the stator core 132 (when viewed from the radial direction, the anti-welding side coil end 61C and the anti-welding side coil end 61 may be a substantially trapezoidal shape).
- the segment conductor 28 is inserted into the status lot 420 from the axial direction. Connection is made as shown in FIG. 3B at another segment conductor 28 inserted at a predetermined slot 420 and the conductor end 28E (for example, by welding).
- the segment conductor 28 includes a conductor straight portion 28S that is a portion inserted into the slot 420 and a conductor skew portion 28D that is a portion inclined toward the conductor end portion 28E of the segment conductor 28 to be connected. (The skewed portion 28D and the end portion 28E are formed by bending).
- FIG. 3C shows an example in which four segment conductors 28 are inserted into one slot 420.
- the cross section is a substantially rectangular conductor, the space factor in the slot 420 can be improved. The efficiency of 10 is improved.
- FIG. 4 is a view when the connection operation of FIG. 3B is repeated until the segment conductor 28 becomes annular, and a coil for one phase (for example, U phase) is formed.
- the coil for one phase is configured such that the conductor end 28E gathers in one axial direction, and forms a welding side coil end 62 and an anti-welding side coil end 61 where the conductor end 28E gathers.
- a terminal of each phase (U-phase terminal 42U in the example of FIG. 4) is formed at one end, and a neutral wire 41 is formed at the other end.
- a total of six coils (U1, U2, V1, V2, W1, W2) of the stator coil 60 are mounted in close contact with the stator core 132.
- the six coils constituting the stator coil 60 are arranged at appropriate intervals by the slot 420.
- One coil end 140 of the stator coil 60 has AC terminals 41 (U), 42 (V), 43 (W), which are coil conductors for input / output of the stator coils 60 of each of the three UVW phases, and a neutral point.
- the connection conductor 40 is drawn out.
- AC terminals 41 (U), 42 (V), and 43 (W) for receiving three-phase AC power are arranged in the axial direction from the coil end 140 to the stator core 132 in order to improve workability in the assembly of the rotating electrical machine 10. It is arranged so as to protrude outward.
- the stator 20 is connected to a power converter (not shown) via the AC terminals 41 (U), 42 (V), and 43 (W), so that AC power is supplied.
- a jumper wire is arranged at the coil end 140, which is a portion of the stator coil 60 that protrudes outward in the axial direction from the stator core 132, and the overall arrangement is orderly.
- the coil end 140 is orderly from the viewpoint of improving the reliability with respect to the insulation characteristics.
- a copper wire insulated with enamel or the like having a substantially rectangular cross section is formed into a substantially U-shaped segment conductor 28 having the anti-welding side coil end apex 28C as a turning point as shown in FIG. .
- the non-welding side coil end apex 28 ⁇ / b> C may be any shape that wraps around the conductor in a substantially U shape.
- the shape is not limited to a shape in which the anti-welding side coil end apex 28C and the anti-welding side anti-welding side coil end conductor skew portion 28F form a substantially triangular shape when viewed from the radial direction as shown in FIG.
- the conductor in a part of the anti-welding side coil end apex 28C, is substantially parallel to the end face of the stator core 21 (the conductors of the anti-welding side coil end apex 28C and the anti-welding side coil end when viewed from the radial direction).
- the shape may be a substantially trapezoidal shape with the skew portion 28F).
- the segment conductor 28 is inserted into the status lot from the axial direction. Connection is made as shown in FIG. 8B at another segment conductor 28 inserted at a predetermined slot away from the conductor end portion 28E (for example, by welding). At this time, the segment conductor 28 is formed with a conductor straight line portion 28S that is a portion inserted into the slot and a conductor skew portion 28D that is a portion inclined toward the conductor end portion 28E of the segment conductor to be connected. (The skewed portion 28D and the end portion 28E are formed by bending). 2, 4, 6... (Multiple of 2) segment conductors are inserted into the slots.
- FIG. 8C shows an example in which four segment conductors are inserted in one slot. However, since the cross section is a substantially rectangular conductor, the space factor in the slot can be improved, and the efficiency of the rotating electrical machine can be improved. improves.
- the stator coil 60 has a structure in which the outer periphery of the conductor is covered with an insulating film, and the electrical insulation is maintained.
- the insulation coil 300 (see FIG. 2) maintains the withstand voltage. Therefore, it is preferable because the reliability can be further improved.
- the insulating paper 300 is disposed in the slot 420 and the coil end 140.
- the insulating paper 300 (so-called slot liner) disposed in the slot 420 is disposed between the segment conductors 28 inserted into the slot 420 and between the segment conductor 28 and the inner surface of the slot 420, and between the segment conductors.
- the withstand voltage between the segment conductor 28 and the inner surface of the slot 420 is improved.
- the insulating paper 300 disposed at the coil end 140 is used by being disposed in an annular shape between the segment conductors for interphase insulation and interconductor insulation at the coil end 140.
- the insulating paper 300 serves as a holding member that prevents dripping when a resin member (for example, polyester or epoxy liquid varnish) is dropped on the whole or a part of the stator coil.
- the insulating paper 300 is an insulating sheet made of heat-resistant polyamide paper, for example, and has a thickness of about 0.1 to 0.5 mm.
- the entire stator coil is covered with a resin member to enhance insulation.
- the first resin member for example, polyester or epoxy liquid varnish
- the first resin member is dropped on the whole or a part of the stator coil and cured.
- the vicinity of the welded portion may be covered with a second resin member (for example, an epoxy-based powder varnish).
- FIG. 9 is a schematic diagram showing a cross section of the rotor 11 and the stator 20.
- the stator coil 60 and the insulating paper 300 accommodated in the shaft 13 and the slot 420 are omitted.
- the rotor 11 has a rotor core 12 and a permanent magnet 18 held in a magnet insertion hole 159 formed in the rotor core 12.
- ⁇ Rotor core ⁇ In the rotor core 12, rectangular parallelepiped magnet insertion holes 159 are formed at equal intervals in the circumferential direction in the vicinity of the outer periphery, and permanent magnets 18 are embedded in each magnet insertion hole 159 and fixed with an adhesive or the like. .
- the circumferential width of the magnet insertion hole 159 is larger than the circumferential width of the permanent magnet 18, and magnetic gaps 156 are formed on both sides of the permanent magnet 18.
- the magnetic gap 156 may be embedded with an adhesive, or may be solidified integrally with the permanent magnet 18 with a resin. Furthermore, depending on use conditions, there may be a clearance in which the magnet can be inserted only by the magnet.
- the rotor core 12 in this embodiment includes a magnet insertion hole 159 of the rotor core 12 and a sagging 800 direction of the inner diameter of the rotor core 12 (burr 810 direction) and a sagging 800 of the outer diameter of the rotor core 12 (burr 810 direction). ) Direction is reversed. By reversing the sagging 800 direction (the burr 810 direction), the insertability between the shaft 118, the permanent magnet 18, and the stator 20 and the rotor 11 can be improved.
- the sag 800 (burr 810) can be managed by adjusting the clearance and punching pressure between the punch 850 and the die 860 during punching. Further, a progressive die for press work or a single shot type may be used by using a die for changing the direction of the punch 850 and the die 860 in order to reverse the sagging 800 and the burr 810. The punching method will be described later.
- the permanent magnet 18 forms the field pole of the rotor 11.
- one magnetic pole is formed by one permanent magnet 18, but one magnetic pole may be formed by a plurality of permanent magnets.
- the magnetization direction of the permanent magnet 18 is in the radial direction, and the direction of the magnetization direction is reversed for each field pole. That is, assuming that the surface on the stator side of the permanent magnet 18 for forming a certain magnetic pole is magnetized to the N pole and the surface on the shaft side is magnetized to the S pole, the surface on the stator side of the permanent magnet 18 forming the adjacent magnetic pole is The S pole and the shaft side surface are magnetized so as to be the N pole.
- the 12 permanent magnets 18 are magnetized so as to alternately change the magnetization direction for each magnetic pole at equal intervals in the circumferential direction, so that the rotor 11 forms 12 magnetic poles. Yes.
- the permanent magnet 18 may be embedded in the magnet insertion hole 159 of the rotor core 12 after being magnetized, or may be inserted into the magnet insertion hole 159 of the rotor core 12 before being magnetized, and then magnetized by applying a strong magnetic field. May be.
- the magnetized permanent magnet 18 has a strong magnetic force. If the magnet is magnetized before the permanent magnet 18 is fixed to the rotor 11, a strong attractive force is generated between the permanent magnet 18 and the rotor core 12. This suction force hinders work. Further, dust such as iron powder may adhere to the permanent magnet 18 due to the strong attractive force. Therefore, in order to improve the productivity of the rotating electrical machine 10, it is desirable that the permanent magnet 18 is magnetized after being inserted into the magnet insertion hole 159 of the rotor core 12.
- neodymium-based, samarium-based sintered magnets, ferrite magnets, neodymium-based bonded magnets, and the like can be used as the permanent magnet 18, but the residual magnetic flux density of the permanent magnet 18 is 0.4-1. About 3T is desirable, and a neodymium magnet is more suitable.
- the auxiliary magnetic pole 160 is formed between the permanent magnets 18 forming the magnetic pole.
- the auxiliary magnetic pole 160 acts so that the magnetic resistance of the q-axis magnetic flux generated by the stator coil 60 is reduced.
- the auxiliary magnetic pole 160 causes the magnetic resistance of the q-axis magnetic flux to be much smaller than the magnetic resistance of the d-axis magnetic flux, so that a large reluctance torque is generated.
- the permanent magnet type rotating electrical machine has been described, but the feature of the present invention relates to the coil end welded portion of the stator, so that the rotor is not a permanent magnet type, but an induction type, synchronous reluctance, It can be applied to a claw magnetic pole type.
- the winding method is a wave winding method, but any winding method having similar characteristics can be applied.
- FIG. 18 is a powertrain of a hybrid vehicle on the premise of four-wheel drive.
- An engine and a rotating electrical machine 10 are provided as main power on the front wheel side.
- the power generated by the engine and the rotating electrical machine 10 is shifted by the transmission and transmitted to the front wheel drive wheels.
- the rotating electrical machine 10 disposed on the rear wheel side and the rear wheel side driving wheel are mechanically connected to transmit power.
- the rotating electrical machine 10 starts the engine, and switches between generation of driving force and generation of electric power for recovering energy at the time of vehicle deceleration as electric energy according to the traveling state of the vehicle.
- the driving and power generation operation of the rotating electrical machine 10 are controlled by the power converter so that the torque and the rotational speed are optimized in accordance with the driving situation of the vehicle. Electric power necessary for driving the rotating electrical machine 10 is supplied from the battery via the power converter. Further, when the rotating electrical machine 10 is in a power generation operation, the battery is charged with electrical energy via the power conversion device.
- the rotating electrical machine 10 that is the power source on the front wheel side is disposed between the engine and the transmission, and has the configuration described with reference to FIGS.
- the rotating electrical machine 10 that is a driving force source on the rear wheel side the same one can be used, or a rotating electrical machine having another general configuration can be used.
- the present invention can also be applied to a hybrid system other than the four-wheel drive system.
- this invention is not limited to the above-mentioned Example, Various modifications are included.
- the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
- an electric vehicle or a rotating electric machine for a hybrid electric vehicle has been described.
- an alternator a starter generator (including a motor generator), an electric compressor, an electric motor
- motors for automobiles such as pumps can be applied to industrial motors such as elevators and motors for home appliances such as air conditioner compressors.
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Abstract
Description
なお、以下の説明では、回転電機の一例として、ハイブリット自動車に用いられる電動機を用いる。また、以下の説明において、「軸方向」は回転電機の回転軸に沿った方向を指す。周方向は回転電機の回転方向に沿った方向を指す。「径方向」は回転電機の回転軸を中心としたときの動径方向(半径方向)を指す。「内周側」は径方向内側(内径側)を指し、「外周側」はその逆方向、すなわち径方向外側(外径側)を指す。
ステータ20は、円筒状のステータコア132と、このステータコア132に装着されるステータコイル60と、を有している。
ステータコア132について、図3および図4を参照して説明する。図3は、ステータコア132を示す斜視図であり、図4は、ステータコア132を構成する電磁鋼板133を示す斜視図である。ステータコア132は、図3に示すように、ステータコア132の軸方向に平行な複数のスロット420が周方向に等間隔となるように形成されている。
図2および図5~図8を参照してステータコイル60について説明する。図5は、三相分のステータコイル60を示す斜視図である。図6、7および8は、それぞれステータコア132に巻回されるU相のステータコイル60、U1相のステータコイル60およびU2相のステータコイル60を示す斜視図である。
次にロータ11について、図1および図9を参照して説明する。図9は、ロータ11およびステータ20の断面を示す模式図である。なお、煩雑さを避けるために、シャフト13やスロット420の内部に収容されているステータコイル60、絶縁紙300は省略している。
ロータコア12には、直方体形状の磁石挿入孔159が外周部近傍において周方向に等間隔で形成されており、各磁石挿入孔159には永久磁石18が埋め込まれ、接着剤などで固定されている。磁石挿入孔159の円周方向の幅は、永久磁石18の円周方向の幅よりも大きく形成されており、永久磁石18の両側には磁気的空隙156が形成されている。この磁気的空隙156は接着剤を埋め込んでもよいし,樹脂で永久磁石18と一体に固めてもよい。さらに、使用条件によっては磁石のみで磁石が挿入できるクリアランスがあってもよい。
永久磁石18は、ロータ11の界磁極を形成するものである。なお、本実施形態では、一つの永久磁石18で一つの磁極を形成する構成としているが、一つの磁極を複数の永久磁石によって構成してもよい。各磁極を形成するための永久磁石を複数に増やすことで、永久磁石が発する各磁極の磁束密度が大きくなり、磁石トルクを増大することができる。
11:ロータ
12:ロータコア
13:シャフト
15:ボルト
18:永久磁石
19:エンドリング
20:ステータ
28:セグメント導体
28C:反溶接側コイルエンド頂点
28D:結線側セグメント導体コイル斜行部
28E:導体端部
28F:反結線側セグメント導体コイル斜行部
40:中性点結線用導体
41:交流端子(U)、42(V)、43(W)
50:ハウジング
60:ステータコイル
61:反溶接側コイルエンド
62:溶接側コイルエンド
115:フランジ
130:液冷ジャケット
132;ステータコア
133:電磁鋼板
140:コイルエンド
144:軸受
145:軸受
150:冷媒(油)貯蔵空間
153:冷媒通路
154:冷媒出口
155:冷媒出口
156:磁気的空隙
159:磁石挿入孔
200:溶接部
201:加締め部
210:溶接溝
300:絶縁紙
420:スロット
430:ティース
440:コアバック
800:ダレ
810:バリ
850:パンチ
860:ダイ
Claims (10)
- 複数のスロットが設けられたステータコアと、
前記スロットに設けられたステータコイルとを有し、
各々の前記スロットにN本(ただし、Nは正の偶数)のセグメント導体が設けられ、
前記ステータコイルは、各々のセグメント導体の導体端部に設けられた溶接部を介して、複数の前記セグメント導体が接続されて構成され、
前記導体端部は、軸方向一方のコイルエンドで周方向に環状に配列され、N列の環状列が構成されている回転電機のステータにおいて、
ステータスロットおよびステータ内径側のステータコアの打ち抜きバリの向きと、ステータ外径側のステータコアの打ち抜きバリの向きとが逆である回転電機のステータ。 - 請求項1に記載の回転電機のステータと、
複数の磁石挿入穴が設けられたロータコアと、前記磁石挿入穴に挿入された磁石とを有し、内径側にはシャフトが挿入される内径穴を有するロータとを備え、
前記ロータが前記ステータの内径側に空隙を介して配置され、
前記磁石挿入穴および前記内径穴のロータコアの打ち抜きバリの向きと、ロータ外径側のロータコアの打ち抜きバリの向きが逆である回転電機。 - 請求項2に記載の回転電機において、
ステータコアとロータコアとが同じ鋼板シートから打ち抜かれた回転電機。 - 請求項2に記載の回転電機において、
積層鋼板のプレスの方向、セグメント導体のスロットへの挿入方向、ハウジングへステータを入れる方向、ステータへロータを入れる方向、ロータへ磁石を入れる方向、ロータへシャフトを入れる方向が全て同じ方向である回転電機。 - 請求項2に記載の回転電機において、
積層鋼板のプレスの方向、ハウジングへステータを入れる方向、ステータへロータを入れる方向、ロータへ磁石を入れる方向、ロータへシャフトを入れる方向が同じ方向であり、
前記セグメント導体のスロットへの挿入方向のみが逆方向である回転電機。 - 請求項2に記載の回転電機において、
U相、V相、W相の各相の結線端子が、セグメント導体のスロットへの挿入方向にある回転電機。 - 請求項4または請求項5に記載の回転電機において、
U相、V相、W相の各相の交流端子が、セグメント導体のスロットへの挿入方向側にある回転電機 - 請求項7に記載の回転電機において、
ステータコイルの冷却が油によってなされている回転電機。 - 請求項1に記載の回転電機のステータと、
複数の誘導バー挿入部が設けられたロータコアと、前記挿入部に挿入された誘導バーとを有し、内径側にはシャフトが挿入される内径穴を有するロータとを備え、
前記ロータが前記ステータの内径側に空隙を介して配置され、
誘導バー挿入部および内径穴のロータコアの打ち抜きバリの向きと、ロータ外径側のロータコアの打ち抜きバリの向きとが逆である誘導回転電機。 - 請求項1に記載の回転電機のステータと、
複数のスリットが設けられたロータコアを有し、内径側にはシャフトが挿入される内径穴を有するロータとを備え、
前記ロータが前記ステータの内径側に空隙を介して配置され、
複数のスリットおよび内径穴のロータコアの打ち抜きバリの向きと、ロータ外径側のロータコアの打ち抜きバリの向きとが逆であるシンクロナスリラクタンストルク回転電機。
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US15/505,998 US20170256997A1 (en) | 2014-09-05 | 2015-08-17 | Stator of Rotary Electric Machine and Rotary Electric Machine Equipped with the Same |
JP2016546401A JPWO2016035533A1 (ja) | 2014-09-05 | 2015-08-17 | 回転電機のステータ、及びこれを備えた回転電機 |
CN201580044174.0A CN106575890A (zh) | 2014-09-05 | 2015-08-17 | 旋转电机的定子和具备它的旋转电机 |
EP15837413.2A EP3197019A4 (en) | 2014-09-05 | 2015-08-17 | Stator for rotary electric machine and rotary electric machine equipped with same |
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JP2018207610A (ja) * | 2017-05-31 | 2018-12-27 | アイシン精機株式会社 | 回転電機 |
DE102019128588A1 (de) | 2018-10-26 | 2020-04-30 | Fanuc Corporation | Verfahren zum herstellen einer motorummantelung mit integriertem stator |
Families Citing this family (6)
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JP6796449B2 (ja) * | 2016-10-21 | 2020-12-09 | 東芝産業機器システム株式会社 | 同期リラクタンス型回転電機 |
JP7039264B2 (ja) * | 2017-11-21 | 2022-03-22 | 山洋電気株式会社 | 回転電機のステータ及びその組み立て方法 |
CN108400663B (zh) * | 2018-05-09 | 2024-01-09 | 江苏富丽华通用设备股份有限公司 | 一种永磁电机的永磁转子 |
US20210359579A1 (en) * | 2018-09-10 | 2021-11-18 | Hitachi Automotive Systems, Ltd. | Stator of Rotary Electric Machine and Rotary Electric Machine Including Stator |
JP7103122B2 (ja) * | 2018-09-27 | 2022-07-20 | 株式会社デンソー | 回転電機 |
JP7052767B2 (ja) * | 2019-03-28 | 2022-04-12 | 株式会社デンソー | 回転電機、およびその固定子 |
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DE102019128588A1 (de) | 2018-10-26 | 2020-04-30 | Fanuc Corporation | Verfahren zum herstellen einer motorummantelung mit integriertem stator |
US11309752B2 (en) | 2018-10-26 | 2022-04-19 | Fanuc Corporation | Method of manufacturing motor jacket incorporating stator |
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EP3197019A1 (en) | 2017-07-26 |
JPWO2016035533A1 (ja) | 2017-05-18 |
US20170256997A1 (en) | 2017-09-07 |
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