JP2010093879A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine with an insulator suitable for insulation of a conductive coil. <P>SOLUTION: The rotary electric machine has a stator core 412, which has a plurality of slots 411, a stator 4, which has a conductor 413 inserted via an insulator 200 into the plurality of slots 411, and a rotor 5, which is counterposed rotatably to the stator 4. Moreover, the insulator 200 is structurized such that it has a crossover part 210 for tying the fellow insulators inserted between adjacent slots 411. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine.

  Conventionally used rotating electrical machines have coils wound in distributed windings in a large number of slots provided so as to open to the inner peripheral side of the stator core, and supply alternating current to the conduction coil of the stator. Thus, a rotating magnetic field is generated in the stator, and a rotating torque is generated in the rotor by the rotating magnetic field. The rotating electrical machine needs to insulate the stator core from the conduction coil so that the stator core and the conduction coil in the slot do not approach each other and cause a ground fault. As shown in FIG. 1, an insulator having a folded shape at the end of the stator core is known.

Japanese Patent Laid-Open No. 11-27888

  Insulating paper that insulates the conductive coil from the stator core requires an insulating paper shape that suppresses scratches on the conductive coil and can withstand high voltages. However, the conventional technology does not always take this into account. There wasn't.

  The objective of this invention is providing the rotary electric machine provided with the insulator suitable for insulation of a conductive coil.

  The present invention relates to a stator core having a plurality of slots, a stator having a conductor inserted into the plurality of slots via an insulator, and a rotor disposed to face the stator and rotatably provided. And the insulator is a rotating electrical machine having a bridging portion for connecting insulators inserted between adjacent slots.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary electric machine provided with the insulator suitable for insulation of a conductive coil can be obtained.

  Hereinafter, a rotating electrical machine according to an embodiment of the present invention will be described.

  The rotating electrical machine of the present embodiment is a rotating electrical machine that includes an insulator suitable for a segment conduction coil that is formed in a rectangular cross section along the slot shape. For example, the insulator is connected to the end of the stator core, and the conduction coil is inserted from the rotation axis direction of the stator. This can prevent the insulator from shifting when the conductive coil is inserted. Further, since the height of the insulator from the stator core can be adjusted after inserting the conductive coil, the insulation can be enhanced.

  In this embodiment, a conduction coil is inserted into a number of slots provided so as to open to the inner peripheral side of the stator core, and an alternating current is supplied to the conduction coil of the stator, whereby a rotating magnetic field is applied to the stator. A rotating electrical machine that generates rotational torque in the rotor is used. As a type of rotating electrical machine, for example, there are an induction motor using a cage rotor and a synchronous motor having a permanent magnet on the rotor. Since these induction motors and synchronous motors can also be used as generators, both of them are referred to as rotating electric machines.

  As an embodiment, a rotary electric machine for a hybrid vehicle will be described with reference to the drawings. FIG. 1 is a side sectional view of an induction type rotating electrical machine. FIG. 2 is a perspective view of a cross section of the rotor. FIG. 3 is an exploded perspective view of each part related to the induction type rotating electric machine according to the present embodiment.

  The induction-type rotating electrical machine shown in FIG. 1 has a bottomed cylindrical housing 1 that is open at one end in the axial direction, and a cover 2 that seals the open end of the housing 1. A water channel forming member 22 is provided inside the housing 1, one end of the water channel forming member 22 is fixed between the housing 1 and the cover 2, and a water channel 24 is formed between the stator 4 and the housing 1. Is done. Cooling water is taken into the water channel 24 from the cooling water intake 32, and the cooling water is discharged from the water channel 24 to the discharge port 34 to cool the rotating electrical machine. The housing 1 and the cover 2 are fastened by a plurality of, for example, six bolts 3.

  A water channel forming member 22 is provided on the inner periphery of the housing 1, and the stator 4 is fixed inside the water channel forming member 22 by shrink fitting or the like. The stator 4 includes a stator core 412 having a plurality of slots 411 provided at equal intervals in the circumferential direction, and a three-phase stator coil 413 wound in each slot 411. In this embodiment, there are 8 poles and 48 slots, and the stator coil 413 is connected by star connection.

  In addition, the rotor 5 is disposed on the inner periphery of the stator core 412 so as to be rotatable through a minute gap so as to face the stator core 412. The rotor 5 is fixed to the shaft 6 and rotates integrally with the shaft 6. The shaft 6 is rotatably supported by ball bearings 7a and 7b that function as a pair of bearings provided in the housing 1 and the cover 2, respectively. Of these bearings 7 a and 7 b, the bearing 7 a on the cover 2 side is fixed by a substantially rectangular fixing plate 8, and the bearing 7 b on the bottom side of the housing 1 is in a recess provided on the bottom of the housing 1. It is fixed. For this reason, the rotor 5 rotates relative to the stator 4, and the shaft 6 is driven by a pulley 12 attached to the cover 2 side end of the shaft 6 via a sleeve 9 and a spacer 10 with a nut 11. A rotational force is output to the outside, or a rotational force from the pulley 12 is input to the shaft 6. Since the outer periphery of the sleeve 9 and the inner periphery of the pulley 12 are slightly conical, the pulley 12 and the shaft 6 are firmly integrated by the tightening force of the nut 11 so that they can rotate integrally. It has become.

  The rotor 5 has conductor bars 511 extending in the rotation axis direction at equal intervals over the entire circumference in the circumferential direction, and a pair of short-circuit rings 512 are provided to short-circuit each conductor bar 511 at both ends in the rotation axis direction. It is a connected cage rotor. The conductor bar 511 is embedded in a rotor core 513 made of a magnetic material. FIG. 2 shows a cross-sectional structure taken along a plane perpendicular to the rotation axis to clearly show the relationship between the rotor core 513 and the conductor bar 511, and the short-circuit ring 512 and the shaft 6 on the pulley 12 side are visible. Absent.

  The rotor core 513 is formed of a laminated steel plate formed by punching or etching an electromagnetic steel plate having a thickness of about 0.05 to 1 mm and laminating the formed electromagnetic steel plates. As shown in FIGS. 2 and 3, substantially fan-shaped cavities 514 are provided at equal intervals in the circumferential direction on the inner peripheral side for weight reduction. A plurality of spaces in which the respective conductor bars 511 are arranged are provided on the outer peripheral side. The rotor core 513 has a conductor bar 511 on the stator side, and a rotor yoke 530 for forming a magnetic circuit inside the conductor bar 511. In the present embodiment, the stator has an 8-pole stator coil, and the magnetic circuit formed in the rotor yoke 530 has a radial direction in comparison with an induction motor having a 2-pole or 4-pole stator coil. Can be made thinner. The thickness can be reduced by increasing the number of poles compared to 8 poles, but there is a problem in that the output and efficiency are lowered if 12 poles or more. Accordingly, the rotating electric machine for running the vehicle including the engine start function is preferably 6 to 10 poles, particularly 8 or 10 poles.

  Each conductor bar 511 and the short-circuit ring 512 are made of aluminum, and are formed so as to be integrated with the rotor core 513 by die casting. The short-circuit rings 512 arranged at both ends of the rotor core are provided so as to protrude from the rotor core 513 to both ends in the axial direction.

  A detection rotor 132 is provided on the bottom side of the housing 1, and the rotation sensor 13 for detecting the rotation speed and the rotor position detects the teeth of the detection rotor 132 to detect the position and rotation of the rotor 5. An electric signal for detecting the rotation speed of the child 5 is output.

  The stator 4 shown in FIG. 3 has a stator core 412 in which 72 slots 411 are formed at equal intervals in the circumferential direction, and a stator coil 413 inserted in the slot 411. The stator core 412 is made of a laminated steel plate formed by, for example, punching or etching a magnetic steel plate having a thickness of about 0.05 to 1 mm and laminating the formed magnetic steel plates, and is equally spaced in the circumferential direction. A plurality of slots 411 arranged radially are formed. In this embodiment, the number of slots is 72. Teeth 414 are provided between these slots 411, and each tooth 414 is integrated with an annular core back 430. That is, each tooth 414 and the core back 430 are integrally formed. Moreover, the inner peripheral side of the slot 411 is opened, and the coil which comprises the stator coil 413 is inserted from this opening part. The width of the opening in the circumferential direction is substantially equal to or slightly larger than the coil mounting portion of each slot in which the coil is mounted.

  Moreover, the crossover wires are arranged on the coil ends, and the arrangement is orderly as a whole, and the entire rotating electrical machine is downsized. In addition, reliability can be ensured in terms of electrical insulation. In particular, recently, rotating electric machines for driving automobiles have a high operating voltage, and many of them exceed 100V. Depending on the case, a voltage of 400V or 600V may be applied, and the reliability between the lines of the conductive coil is important.

  In FIG. 4, a conduction coil 413 is inserted into the stator 4, and an insulator 200 protrudes from the end surface of the stator core 412 so that the insulation between the conduction coil 413 and the stator core 412 is maintained. The insulator 200 protrudes from the end surface of the stator core 412 by about 2 mm to 5 mm.

  The insulator 200 is made of an insulating member made of a plate material, and has a thickness of about 0.1 to 0.5 mm. Further, the insulator 200 has a crossing portion 210.

  Next, the insulating structure of the stator 4 will be described. As shown in FIG. 4, the insulator 200 is inserted into the slot 411 of the stator core 412 in advance. A substantially round or substantially rectangular conductive coil 413 is inserted there from the rotation axis direction.

  When the conductive coil 413 is inserted from the rotation axis direction of the stator core 412, the insulator 200 inserted in the slot 411 is connected by the crossover part 210, so that the crossover part is inserted by the positioning jig 211 after the conductive coil 413 is inserted. 210 can be used to adjust the required height to ensure insulation of the insulator. Furthermore, the deviation generated during insertion can be adjusted, and reliable electrical insulation is possible, resulting in an insulation structure suitable for higher voltage.

  FIGS. 5A to 5G show a method of forming a substantially S-shaped insulator 200 having a connection between two adjacent slots. The insulator 200 is formed by a bending process so as to have a shape along the shape of the slot 411 of the stator core 412 having the transition portion 210.

  In the case of a low voltage, the structure may not be such that adjacent conductive coils 413 are separated, but in the case of a high voltage, an insulator 200 structure in which the conductive coils 413 are surely separated and the conductive coil 413 is wrapped is preferable.

  FIGS. 6A to 6D show a method of forming the substantially S-shaped insulator 200 having a connection between three adjacent slots. The insulator 200 includes a transition portion 210 and is formed by a bending process so as to have a shape along the shape of the slot 411 of the stator core 412.

  FIGS. 7A to 7D show a method of forming the substantially square-shaped insulator 200 having a connection between two adjacent slots. It is formed by a bending process so as to have a shape along the shape of the slot 411 of the stator core 412 provided with the transition portion 210.

  As described above, the shape of the insulator can be changed according to the conductive coil 413 inserted into the slot 411, and high insulation can be ensured in the same bending process as the conventional method of forming an insulator.

  Furthermore, if the structure of the insulator 200 is a structure in which all slots are connected to each other, an insulation distance between the conductive coil 413 and the stator core 412 can be secured, and insulation can be improved.

  8A to 8C show a state where the insulator 200 according to the embodiment is inserted into the stator core 412. FIG. The crossover part 210 preferably has a structure straddling adjacent slots 411. FIG. 8A shows a state where the insulator 200 described in FIG. 5 is inserted into the slot 411. Two adjacent slots are connected by a crossover.

  FIGS. 8B and 8C show a state where the insulator 200 described in FIG. 6 is inserted into the slot 411. In FIG. 8B, two sets of insulators 200 are inserted in three adjacent slots in the radial direction. 8C, two sets of insulators 200 are inserted in the slots 411 in the radial direction as in FIG. 8B. Unlike FIG. 8B, the insulators 200 on the radially outer side The arrangement with the radially inner insulator 200 is shifted by one slot in the circumferential direction.

  FIG. 9 shows the state of positioning control by adjusting the height of the insulator.

  As shown in FIG. 9, by providing a positioning jig 211 between the stator core and the transition portion 210 of the insulator 200, the protrusion of the insulator 200 is adjusted to a required height that ensures insulation of the insulator 200. can do.

  Further, before the conductive coil 413 is inserted, the transition portion 210 of the insulator 200 can be used as a latch by the positioning jig 211.

  Thereby, after inserting the conductive coil 413 into the insulator 200, the height of the insulator from the end surface of the stator core 412 can be controlled, and productivity is improved.

  Further, the transition portion 210 of the insulator 200 may be cut after the height from the stator core 412 is made substantially constant.

  As described above, by inserting the insulator 200 having the transition portion 210 into the stator core 412, the transition portion 210 can be used to adjust the required height to ensure insulation of the insulator. Furthermore, the deviation generated during insertion can be adjusted, and reliable electrical insulation is possible, and an insulation structure suitable for higher voltage can be obtained.

The side sectional view of the induction type rotating electrical machine which constitutes one embodiment of the present invention is shown. The expansion | deployment perspective view of each component of FIG. 1 is shown. The perspective view of the stator 4 of FIG. 1 is shown. The detailed drawing of the stator of the Example of this invention is shown. The manufacturing process figure of an insulator is shown. The manufacturing process figure of an insulator is shown. The manufacturing process figure of an insulator is shown. A detailed view of the stator is shown. Insulator positioning control is shown.

Explanation of symbols

4 Stator 5 Rotor 200 Insulator 210 Crossover 211 Positioning jig 411 Slot 412 Stator core 413 Conducting coil

Claims (7)

A stator core having a plurality of slots;
A stator having a conductor inserted through an insulator into the plurality of slots;
A rotor disposed opposite to the stator and rotatably provided;
The said insulator is a rotary electric machine which has a crossing part for connecting the insulators inserted between adjacent slots. The rotating electrical machine according to claim 1,
The conductor is a rotating electrical machine inserted from the direction of the rotation axis. The rotating electrical machine according to claim 1,
The rotating electrical machine, wherein the insulator is insulating paper. The rotating electrical machine according to claim 1,
The rotary electric machine has a shape of any one of an approximately S shape, an approximately B shape, an approximately 6 shape, an approximately U shape, and an approximately B shape. The rotating electrical machine according to claim 1,
The crossing part of the insulator is a rotating electrical machine straddling two adjacent slots. The rotating electrical machine according to claim 1,
The rotating electrical machine in which the insulator protrudes from an end surface of the stator core, and is inserted into the slot with a substantially constant height protruding from the end surface of the stator core. A stator core having a plurality of slots;
A stator having a conductor inserted through an insulator into the plurality of slots;
A rotor provided rotatably through a gap so as to face the stator,
The rotating electrical machine according to claim 1, wherein the insulator includes a transition portion having a connection at a coil end portion protruding from an end face of the stator.

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