JP2010093918A - Divided core and rotating electric machine using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a divided core which suppresses an iron loss and sufficiently positions a coil, and a rotating electric machine using the divided core. <P>SOLUTION: The divided core 2310 is constituted of a silicon steel plate, and includes: a first member 2320 having teeth 2321 on which a coil is to be wound; and a second member 2330 whose silicon content rate is lower than that of the silicon steel plate, laminated in the central axial direction of a stator with respect to the first member 2320, and comprises teeth 2331 on which a coil is to be wound, and a flange 2332 which is arranged at tips of the teeth 2331 and bent after the insertion of the coil to position the coil. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a split core and a rotating electric machine using the same, and more particularly to a split core configured by stacking steel plates and a rotating electric machine using the same.

Conventionally, rotating electrical machines are disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-187478 (Patent Document 1), Japanese Patent Application Laid-Open No. 11-164526 (Patent Document 2), Japanese Patent Application Laid-Open No. 2007-195278 (Patent Document 3), and Japanese Patent Application Laid-Open No. No. 111745 (Patent Document 4).
JP 2004-187478 A JP 11-164526 A JP 2007-195278 A Japanese Patent Application Laid-Open No. 7-1111745

In patent document 1, the structure by which a bending piece is extended at the front-end | tip of each teeth is disclosed.
Patent Document 2 discloses a configuration in which the development core is configured by laminating a large number of steel plates, and a pair of projecting pieces are formed so as to project further in the projecting direction from the tip of the teeth.

  Patent Document 3 discloses that a pair of flexible tongue pieces is provided at the tip of each magnetic pole.

  Patent Document 4 discloses a structure of an electric motor in which a high silicon plate and a low silicon plate are alternately laminated to lower the iron loss as a whole.

  In the prior art, it has been difficult to sufficiently hold the coil while reducing the iron loss of the stator.

  Accordingly, the present invention has been made to solve the above-described problems, and provides a split core capable of reliably holding a coil while reducing iron loss and a rotating electric machine using the same. For the purpose.

  The split core according to the present invention is a split core that is split in the circumferential direction so as to constitute a part of the stator, and is composed of a silicon steel plate and includes a first member that has a teeth portion for winding a coil. The silicon content is lower than that of the silicon steel sheet, and is laminated in the direction of the central axis of the stator with respect to the first member, and is provided at the tip of the tooth portion and wound after insertion of the coil. And a second member having a flange portion for positioning.

  In the split core of the stator configured as described above, since the first steel plate contains a large amount of silicon, iron loss can be suppressed.

  Furthermore, since the second member has a collar portion that is bent after coil insertion to position the coil, the coil can be reliably held.

Preferably, the second member is made of SPCC (steel plate cold commercial).
Preferably, the second member is laminated so as to be fewer than the first member.

  Preferably, the rotating electrical machine according to the present invention includes the above-described split core.

  According to the present invention, it is possible to provide a split core that can suppress the occurrence of iron loss and can reliably hold a coil, and a rotating electrical machine using the split core.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  FIG. 1 is a cross-sectional view of a rotating electrical machine having a stator composed of divided cores according to an embodiment of the present invention. Referring to FIG. 1, rotating electric machine 2200 includes a stator 2300 and a rotor 2400 provided on the inner peripheral side of stator 2300. The stator 2300 has a ring shape and is disposed so as to surround the rotor 2400.

  Stator 2300 includes a divided core 2310 divided in the circumferential direction and a coil 2390 wound around divided core 2310. The coil 2390 is wound around the split core 2310 and is held by the flange 2332 at the tip thereof.

  FIG. 2 is a plan view showing a first member constituting the split core according to the embodiment of the present invention. FIG. 3 is a plan view showing a second member constituting the split core according to the embodiment of the present invention. Referring to FIG. 2, first member 2320 is formed of a silicon steel plate. The first member 2320 has a tooth portion 2321 for inserting a coil. Teeth portion 2321 extends in the inner circumferential direction.

  Referring to FIG. 3, second member 2330 is configured by SPCC. The silicon content of second member 2330 is lower than the silicon content of first member 2320. Therefore, the second member 2330 made of SPCC can be easily bent. The second member 2330 is formed with a tooth portion 2331 extending in the inner circumferential direction. Between the tooth portions 2331 is a slot, and a coil is wound around this slot. A collar portion 2332 is provided at the tip of the tooth portion 2331. The flange 2332 is bent in the outer circumferential direction after the coil is inserted to hold the coil. SPCC has no insulating coating on the surface. On the other hand, the silicon steel plate is provided with an insulating coating on the surface.

The generation of iron loss can be suppressed by this insulating coating.
FIG. 4 is a perspective view of a split core configured by laminating the first member shown in FIG. 2 and the second member shown in FIG. Referring to FIG. 4, first member 2320 and second member 2330 are stacked to form a split core. The lamination method of the first member 2320 and the second member 2330 is not particularly limited as long as at least one first member 2320 and at least one second member 2330 are included. In this example, the number of second members 2330 is stacked so as to be smaller than the number of first members 2320.

  5 and 6 are diagrams for explaining the first and second steps of the method of inserting a coil into the split cores laminated in FIG. Referring to FIG. 5, coil 2390 is fitted into a slot between teeth. The coil 2390 is formed in an annular shape in advance, and the split core 2310 is inserted from the outside thereof. At this time, the flange portion 2332 is arranged to extend in the circumferential direction so as not to interfere with the insertion.

  FIG. 6 is a diagram for explaining a process of bending the flange after inserting the coil into the split core. As shown in FIG. 6, after inserting the coil 2390 into the teeth, the flange portion 2332 is bent in the circumferential direction. By this bending process, the flange portion 2332 is bent toward the outer peripheral side. As a result, the coil 2390 is held by the flange portion 2332.

  FIG. 7 is a cross-sectional view of a rotating electrical machine having a stator composed of split cores according to the present invention. Referring to FIG. 7, rotating electric machine 2200 includes a stator 2300 formed in an annular shape, a rotating shaft 2410 that is inserted into stator 2300 and is rotatable about rotation center line O, and rotating shaft 2410. And a rotor 2400 provided so as to be rotatable about a rotation center line O.

  The rotor 2400 includes a rotor core 2420 formed by laminating a plurality of electromagnetic steel plates, and a plurality of permanent magnets 2430 attached to the rotor core 2420. In the vicinity of the outer peripheral edge portion of the rotor core 2420, a plurality of magnet insertion holes 2450 extending with respect to the rotation center line O are provided at intervals in the circumferential direction. The permanent magnet 2430 is inserted into the magnet insertion hole 2450 and fixed by the resin 2440 filled in the magnet insertion hole 2450.

  FIG. 8 is a diagram for illustrating the configuration of the drive unit of the vehicle including the rotating electrical machine according to the embodiment of the present invention. In FIG. 8, the electric circuit for driving the rotary electric machine mounted in the vehicle according to this invention is shown. Referring to FIG. 8, PCU (power control unit) 2700 includes converter 2710, inverter 2720, control device 2730, capacitors C1 and C2, power supply lines PL1 to PL3, output lines 2740U, 2740V, and 2740W. including. Converter 2710 is connected between battery 3000 and inverter 2720, and inverter 2720 is connected to rotating electrical machine 2200 via output lines 2740U, 2740V, and 2740W.

  Battery 3000 connected to converter 2710 is a secondary battery such as nickel metal hydride or lithium ion. Battery 3000 supplies the generated DC voltage to converter 2710 and is charged by the DC voltage received from converter 2710.

Converter 2710 includes power transistors Q1 and Q2, diodes D1 and D2, and a reactor L. Power transistors Q1 and Q2 are connected in series between power supply lines PL2 and PL3, and receive a control signal from control device 2730 as a base. Diodes D1 and D2 are connected between the collector and emitter of power transistors Q1 and Q2, respectively, so that current flows from the emitter side to the collector side of power transistors Q1 and Q2. Reactor L has one end connected to power supply line PL1 connected to the positive electrode of battery 3000, and the other end connected to a connection point of power transistors Q1 and Q2.

  Converter 2710 boosts the DC voltage received from battery 3000 using reactor L, and supplies the boosted boosted voltage to power supply line PL2. In addition, converter 2710 steps down the DC voltage received from inverter 2720 and charges battery 3000.

  Inverter 2720 includes a U-phase arm 2750U, a V-phase arm 2750V, and a W-phase arm 2750W. Each phase arm is connected in parallel between power supply lines PL2 and PL3. U-phase arm 2750U includes power transistors Q3 and Q4 connected in series, V-phase arm 2750V includes power transistors Q5 and Q6 connected in series, and W-phase arm 2750W includes power transistors connected in series. Transistors Q7 and Q8 are included. Diodes D3 to D8 are respectively connected between the collector and emitter of power transistors Q3 to Q8 so that current flows from the emitter side to the collector side of power transistors Q3 to Q8. A connection point of each power transistor in each phase arm is connected to a semi-neutral point side of each phase coil of rotating electrical machine 2200 as a motor generator via output lines 2740U, 2740V, and 2740W.

  Inverter 2720 converts a DC voltage received from power supply line PL2 into an AC voltage based on a control signal from control device 2730, and outputs the AC voltage to rotating electric machine 2200. Inverter 2720 rectifies the AC voltage generated by rotating electric machine 2200 into a DC voltage and supplies the rectified voltage to power supply line PL2.

  Capacitor C1 is connected between power supply lines PL1 and PL3, and smoothes the voltage level of power supply line PL1. Capacitor C2 is connected between power supply lines PL2 and PL3, and smoothes the voltage level of power supply line PL2.

  Control device 2730 calculates each phase coil voltage of rotating electrical machine 2200 based on the motor torque command value, each phase current value of rotating electrical machine 2200, and the input voltage of inverter 2720, and based on the calculation result, power transistors Q3-3. A PWM (Pulse Width Modulation) signal for turning on / off Q8 is generated and output to inverter 2720.

  Control device 2730 calculates the duty ratio of power transistors Q1 and Q2 for optimizing the input voltage of inverter 2720 based on the motor torque command value and motor rotation speed described above, and the power is calculated based on the calculation result. A PWM signal for turning on / off transistors Q1 and Q2 is generated and output to converter 2710.

  Further, control device 2730 controls the switching operation of power transistors Q1 to Q8 in converter 2710 and inverter 2720 in order to charge battery 3000 by converting AC power generated by rotating electrical machine 2200 into DC power.

  In PCU 2700, converter 2710 boosts a DC voltage received from battery 3000 based on a control signal from control device 2730 and supplies the boosted voltage to power supply line PL2. Inverter 2720 receives the DC voltage smoothed by capacitor C2 from power supply line PL2, converts the received DC voltage into an AC voltage, and outputs the AC voltage to rotating electrical machine 2200.

  Inverter 2720 converts the AC voltage generated by the regenerative operation of rotating electrical machine 2200 into a DC voltage and outputs the DC voltage to power supply line PL2. Converter 2710 receives the DC voltage smoothed by capacitor C2 from power supply line PL2, and steps down the received DC voltage to charge battery 3000.

  9 to 12 are diagrams showing an example of a laminated state of the first member and the second member in the split core according to the embodiment of the present invention. With reference to FIG. 9, both ends in the axial direction may be constituted by the second member 2330, and the other may be constituted by the first member 2320.

  Further, as shown in FIG. 10, both ends and the central portion in the axial direction may be configured by the second member 2330, and the other may be configured by the first member 2320. In the arrangement shown in FIGS. 9 and 10, the number of first members 2320 is increased, and the number of second members 2330 formed of SPCC can be minimized. In this case, the coil performance is emphasized.

  Referring to FIG. 11, first members 2320 and second members 2330 may be alternately stacked. In addition, as illustrated in FIG. 12, one second member 2330 may be stacked on the plurality of first members 2320.

  11 and 12, the coil can be fixed, the magnetic flux density of the gap can be improved, and the eddy loss of the coil can be reduced.

  As described above, in rotary electric machine 2200 and its split core 2310 according to the present invention, since first member 2320 made of a silicon steel plate is included, occurrence of iron loss can be suppressed.

  In addition, since the second member 2330 made of SPCC is provided with the flange 2332, the coil 2390 can be held by bending the flange 2332 outward as shown in FIG.

  Further, the gap magnetic flux fluctuation due to the flange 2332 can be reduced. Specifically, the flange 2332 has a function of reducing the torque ripple by making the gap magnetic flux sinusoidal. Thereby, excellent magnetic properties can be exhibited. In addition, the vortex loss of the coil can be reduced. Specifically, the distance from the gap surface of the coil 2390 can be managed. Further, the amount of leakage magnetic flux across the coil 2390 can be reduced by the shielding effect of the flange portion 2332.

  The split core 2310 according to the present invention is composed of a silicon steel plate, and has a first member 2320 having a tooth portion 2321 for winding the coil 2390, and a silicon content lower than that of the silicon steel plate, and is compared with the first member 2320. A second portion having a tooth portion 2331 for winding the coil 2390 and a flange portion 2332 provided at the tip of the tooth portion 2331 and bent after the insertion of the coil 2390 to position the coil 2390, which are laminated in the central axis direction of the stator. Member 2330.

  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 sectional drawing of the rotary electric machine which has a stator comprised with the split core according to embodiment of this invention. It is a top view which shows the 1st member which comprises the division | segmentation core according to embodiment of this invention. It is a top view which shows the 2nd member which comprises the split core according to embodiment of this invention. It is a perspective view of the split core comprised by laminating | stacking the 1st member shown in FIG. 2, and the 2nd member shown in FIG. It is a figure for demonstrating the 1st process of the method of inserting a coil in the division | segmentation core laminated | stacked in FIG. It is a figure for demonstrating the 2nd process of the method of inserting a coil in the division | segmentation core laminated | stacked in FIG. It is sectional drawing of the rotary electric machine which has a stator comprised with the division | segmentation core according to this invention. It is a figure for demonstrating the structure of the drive part of the vehicle provided with the rotary electric machine according to embodiment of this invention. It is a figure which shows an example of the lamination | stacking state of the 1st member and the 2nd member in the split core according to embodiment of this invention. It is a figure which shows an example of the lamination | stacking state of the 1st member and the 2nd member in the split core according to embodiment of this invention. It is a figure which shows an example of the lamination | stacking state of the 1st member and the 2nd member in the split core according to embodiment of this invention. It is a figure which shows an example of the lamination | stacking state of the 1st member and the 2nd member in the split core according to embodiment of this invention.

Explanation of symbols

  2200 Rotating electrical machine, 2300 Stator, 2310 Divided core, 2320 First member, 2321 Teeth part, 2330 Second member, 2331 Teeth part, 2332 Gutter part, 2390 Coil, 2400 Rotor, 2410 Rotating shaft, 2420 Rotor core, 2430 Permanent magnet, 2440 Resin, 2450 Magnet insertion hole, 2710 Converter, 2720 Inverter, 2730 Controller, 3000 Battery.

Claims (4)

A split core that is split in the circumferential direction to form part of the stator,
A first member composed of a silicon steel plate and having a teeth portion for winding a coil;
The silicon content is lower than that of the silicon steel sheet, and is laminated in the direction of the central axis of the stator with respect to the first member, and is provided at the tip of the tooth portion and bent after inserting the coil. And a second member having a flange portion for positioning the coil.   The split core according to claim 1, wherein the second member is made of SPCC (steel plate cold commercial).   The split core according to claim 1, wherein the second member is laminated so as to be smaller than the first member.   A rotating electrical machine comprising the split core according to any one of claims 1 to 3.

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