JP2010081715A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase circuit inductance of an AC rotary electric machine easily. <P>SOLUTION: The rotary electric machine has: a rotor 11 of a roughly hollow cylindrical shape, which rotates around a rotating shaft; and a stator core 21 which is of a roughly cylindrical shape arranged so as to pass through the hollow part of the rotor 11, on the outside circumferential surface of which a plurality of stator slots 29 extending in the direction of the rotating shaft are formed, and which is made stationary and fixed. Each stator slot 29 has: coils 31, 32 extending in the direction of the rotating shaft; a non-magnetic slot wedge 41, which extends in the direction of the rotating shaft and is fitted into the opening side of the stator slot 29 from the coils 31, 32 inside the stator slot 29; and a spacer 51 which extends in the direction of the rotating shaft, is inserted so as to contact the coils, and has magnetism. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a rotating electric machine having an armature in which slots are formed.

  For example, when a multiphase AC rotating electrical machine is driven using an inverter device, a harmonic current resulting from switching of the inverter is generated in the drive current. Thereby, in addition to the loss due to the fundamental wave current, the harmonic loss due to the harmonic current is generated in the winding.

  In order to reduce the loss due to the harmonic current, for example, as disclosed in Patent Document 1, a method of increasing the circuit inductance to reduce the harmonic current is known.

Although this method deteriorates the power factor, a design for increasing the slot leakage inductance, such as deepening the slot and increasing the number of coil turns, has been performed. It is also known to insert a reactor in series between the inverter device and the armature winding terminal.
JP-A-5-95642

  However, when it is necessary to design a low inductance such as a high-speed large-capacity machine, a multi-phase motor, or a low-voltage high-current motor, there is a limit to increasing the inductance by designing the rotating electrical machine.

  In addition, there is a method of applying a magnetic slot wedge as a method of increasing the leakage inductance, but there are cases where the wedge shape has many restrictions and the inductance cannot be easily increased.

  In addition, since electromagnetic force or the like acts on the wedge of the magnetic slot, loosening or dropping is likely to occur. As a result, safety and reliability are lowered, so that it may not be applicable to high-speed, large-capacity machines, multiphase motors, and low-voltage, high-current motors.

  On the other hand, when inserting a reactor in series with a circuit, it is necessary to flow a fundamental current through the reactor. This increases the size of the apparatus, causing loss and magnetic sound.

  The present invention solves the above-described problems, and an object of the present invention is to increase the slot leakage magnetic flux of the AC rotating electric machine and easily increase the circuit inductance.

  In order to achieve the above object, a rotating electrical machine according to the present invention includes a substantially cylindrical rotor having a rotation axis as a rotation center, and a hollow portion extending in the rotation axis direction so as to surround the rotor. A plurality of stator slots extending in the direction of the rotation axis are formed on the inner peripheral side surface of the hollow portion, the stator cores are stationary and fixed, and the stator slots are disposed in the stator slots. A coil extending in the direction of the rotation axis, a nonmagnetic slot wedge extending in the direction of the rotation axis and attached to be fitted closer to the opening side of the stator slot than the coil in the stator slot, and the rotation A spacer that extends in the axial direction and is magnetically inserted into contact with the coil in the stator slot.

  The rotating electrical machine according to the present invention includes a substantially hollow cylindrical rotor that rotates around a rotating shaft, and a substantially cylindrical shape that is disposed so as to penetrate through the hollow portion of the rotor, and the rotating shaft is disposed on an outer peripheral side surface. A plurality of stator slots extending in a direction are formed, the stator core fixed stationary, a coil disposed in each stator slot and extending in the rotation axis direction, and extending in the rotation axis direction, A nonmagnetic slot wedge attached to be fitted closer to the opening side of the stator slot than the coil in the stator slot, and extends in the rotation axis direction so as to contact the coil in the stator slot And a spacer provided with magnetism.

  The rotating electrical machine according to the present invention has a hollow cylindrical shape arranged around the rotating shaft, and a plurality of armature slots extending in the rotating shaft direction includes at least one of an outer peripheral surface and an inner peripheral surface of the hollow portion. An armature formed in each armature slot and extending in the direction of the rotation axis, and extending in the direction of the rotation axis, and in the armature slot more than the coil in the armature slot A non-magnetic slot wedge attached so as to be fitted to the opening side, and a spacer extending in the direction of the rotation axis and inserted in contact with the coil in the armature slot and provided with magnetism. It is characterized by.

  According to the present invention, it is possible to increase the slot leakage magnetic flux of the AC rotating electric machine and easily increase the circuit inductance.

  Hereinafter, embodiments of a rotating electrical machine according to the present invention will be described with reference to the drawings.

[First Embodiment]
A first embodiment of a rotating electrical machine according to the present invention will be described with reference to FIGS. FIG. 1 is a partial cross-sectional view showing a part of the stator of the rotating electrical machine of the present embodiment. FIG. 2 is a schematic perspective view showing the appearance of the inter-coil magnetic spacer 51 of FIG. FIG. 3 is a perspective view showing the appearance of the sub-wedge nonmagnetic spacer 42 and the groove bottom nonmagnetic spacer 43 of FIG.

  The rotating electrical machine of this embodiment includes a substantially cylindrical inner rotor 11 having a rotation axis as a rotation center and a hollow portion formed so as to surround the inner rotor 11 and extends in the direction of the rotation axis. This is an inner rotor type rotating electrical machine having a hollow cylindrical shape and having an outer stator core 21 fixed stationary and having a stator as an armature.

  As shown in FIG. 1, a plurality of stator slots 29 extending in the rotation axis direction are formed in parallel in the circumferential direction on the inner peripheral surface 22 of the hollow portion 23 of the outer stator core 21 in the circumferential direction. Yes. In FIG. 1, only one stator slot 29 is shown.

  In each of the plurality of stator slots 29, there are two layers of coils extending in the direction of the rotation axis, that is, a first coil 31 on the groove bottom side of the stator slot 29 and a second coil 32 on the opening side. Has been placed. Each of the first coil 31 and the second coil 32 is provided with a ground insulation 35 that covers the outer periphery thereof.

  A nonmagnetic slot wedge 41 extending in the direction of the rotation axis is fitted into each stator slot 29 so as to be closer to the opening side of the stator slot 29 than the second coil 32.

  An inter-coil magnetic spacer 51 is inserted between the second coil 32 and the first coil 31. As shown in FIG. 2, the inter-coil magnetic spacer 51 is in the form of a strip extending in the rotation axis direction and has magnetism.

  The inter-coil magnetic spacer 51 is formed by mixing a magnetic material such as iron powder and a nonmagnetic material such as a non-conductive adhesive and an epoxy resin. Further, a flat plate thinner than the plate thickness h 1 of the magnetic spacer shown in FIG. 2 may be laminated and inserted into the stator slot 29.

  A non-wedge nonmagnetic spacer 42 is inserted between the nonmagnetic slot wedge 41 and the second coil 32. A groove bottom nonmagnetic spacer 43 is inserted between the bottom of the stator slot 29 and the first coil 31. These sub-wedge nonmagnetic spacers 42 and groove bottom nonmagnetic spacers 43 are in the form of strips extending in the direction of the rotation axis, as shown in FIG. 3, for example, glass / polyester laminates. Similarly to the inter-coil magnetic spacer 51 of FIG. 2, flat plates thinner than the plate thickness h2 of the non-wedge nonmagnetic spacer 42 or the groove bottom nonmagnetic spacer 43 shown in FIG.

  This groove bottom nonmagnetic spacer 43 has a function of insulating the first coil 31 and the slot wall surface including the bottom of the stator slot 29, and the first coil 31 and the second coil 32 are located at desired positions in the stator slot 29. And a dimension adjusting function for disposing them.

  In each stator slot 29, the first coil 31 and the second coil 32 are arranged, and the nonmagnetic slot wedge 41, the non-wedge nonmagnetic spacer 42, the inter-coil magnetic spacer 51, and the groove bottom nonmagnetic spacer 43 are inserted. Then, it is vacuum impregnated with an epoxy resin or the like.

  In addition, the rotating electrical machine of the present embodiment is configured such that a power conversion device (not shown) such as an inverter device can be connected to the first and second coils 31 and 32 to supply a drive current.

  The inductance of the multi-phase AC rotating electric machine is determined by the magnitudes of the slot leakage magnetic flux, the jagged leakage magnetic flux, the coil end leakage magnetic flux, the inter-phase leakage magnetic flux, etc. in the stator slot 29 and the slots formed in the rotor.

  In this embodiment, the slot leakage magnetic flux is mainly increased. The slot leakage magnetic flux can be calculated from the dimensions of the groove width and groove depth of the stator slot 29 and the dimensions of the coils inserted into the stator slot 29, that is, the first and second coils 31 and 32.

  For this reason, when a magnetic material is inserted under the nonmagnetic slot wedge 41 of the stator slot 29 and between the first and second coils 31 and 32, magnetic flux easily passes through the magnetic material portion compared to air. The slot leakage magnetic flux increases. For this reason, circuit inductance increases.

  Moreover, compared with the case where each spacer is comprised only with the nonmagnetic spacer, in this embodiment, winding inductance increases. For this reason, harmonic loss can be reduced.

  Further, since electromagnetic force or the like does not act on the nonmagnetic slot wedge 41, it is possible to suppress loosening, dropping off, and the like. For this reason, the safety and reliability of the rotating electrical machine are improved.

  Furthermore, if it is determined that the inductance is smaller than the desired value when an AC voltage is applied to the rotating electrical machine in which no magnetic spacer is inserted and the inductance is measured, the portion where the non-magnetic spacer has been inserted is magnetized. Replace the spacer. As a result, the slot leakage magnetic flux can be increased without significant design change, and the circuit inductance can be increased.

  As can be seen from the above description, according to the present embodiment, the slot leakage magnetic flux of the AC rotating electric machine can be increased and the circuit inductance can be easily increased without adding a large reactor.

[Second Embodiment]
A second embodiment of the rotating electrical machine according to the present invention will be described with reference to FIG. FIG. 4 is a partial cross-sectional view showing a part of the stator of the rotating electric machine according to the second embodiment of the present invention. In addition, this embodiment is a modification of 1st Embodiment, Comprising: The same code | symbol is attached | subjected to the same part or similar part as 1st Embodiment, and duplication description is abbreviate | omitted.

  In the present embodiment, a sub-wedge magnetic spacer 52 is inserted between the nonmagnetic slot wedge 41 and the second coil 32. The under-wedge magnetic spacer 52 has the same function as the inter-coil magnetic spacer 51 described in the first embodiment.

  Thereby, in addition to the effect of the first embodiment, it is possible to further increase the slot leakage inductance.

[Third Embodiment]
A third embodiment of the rotating electrical machine according to the present invention will be described with reference to FIG. FIG. 5 is a partial cross-sectional view showing a part of the stator of the rotating electrical machine of the present embodiment. In addition, this embodiment is a modification of 1st Embodiment, Comprising: The same code | symbol is attached | subjected to the same part or similar part as 1st Embodiment, and duplication description is abbreviate | omitted.

  In the present embodiment, a single layer coil 33 extending in the direction of the rotation axis is disposed in the stator slot 29. As in the first embodiment, the single-layer coil 33 is provided with a ground insulation 35 on the outside thereof.

  A non-wedge magnetic spacer 52 is inserted between the nonmagnetic slot wedge 41 and the single-layer coil 33 as in the third embodiment.

  As a result, even in the case of the single-layer coil 33, the slot leakage inductance can be easily increased as in the first embodiment.

[Fourth Embodiment]
A fourth embodiment of the rotating electrical machine according to the present invention will be described with reference to FIG. FIG. 6 is a partial cross-sectional view showing a part of the stator of the rotating electric machine according to the fourth embodiment of the present invention. In addition, this embodiment is a modification of 1st Embodiment, Comprising: The same code | symbol is attached | subjected to the same part or similar part as 1st Embodiment, and duplication description is abbreviate | omitted.

  The rotating electrical machine according to the present embodiment includes a substantially hollow cylindrical outer rotor 15 that rotates around a rotation axis, and a substantially cylindrical shape that is fixed so as to pass through the hollow portion of the outer rotor 15. This is an outer rotor type rotating electrical machine having an inner stator stator core 25 and having the stator as an armature.

  As shown in FIG. 6, a plurality of stator slots 29 extending in the rotational axis direction are formed on the outer peripheral surface 26 of the inner stator core 25 at intervals in the circumferential direction.

  As in the first embodiment, each stator slot 29 is provided with the first coil 31 and the second coil 32, and includes a non-magnetic slot wedge 41, a non-wedge non-magnetic spacer 42, an inter-coil magnetic spacer 51, and After the groove bottom nonmagnetic spacer 43 is inserted, it is vacuum impregnated with epoxy resin or the like.

  According to the present embodiment, the same effect as that of the first embodiment can be obtained also in the outer rotor type rotating electrical machine.

[Other Embodiments]
The description of the above embodiment is an example for explaining the present invention, and does not limit the invention described in the claims. Moreover, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.

  In the second and third embodiments, the inner rotor type rotating electrical machine has been described, but the present invention is not limited to this. It can also be used for an outer rotor type rotating electrical machine.

  Moreover, although said embodiment demonstrated the case where a stator became an armature, it is not restricted to this. Even when the rotor is an armature, the under-wedge magnetic spacers 52 and the like may be inserted into a plurality of armature slots formed in the rotor serving as the armature.

It is a fragmentary cross-sectional view which shows a part of stator of the rotary electric machine of 1st Embodiment which concerns on this invention. It is a schematic perspective view which shows the external appearance of the magnetic spacer between coils of FIG. It is a perspective view which shows the external appearance of the non-wedge nonmagnetic spacer and groove bottom nonmagnetic spacer of FIG. It is a fragmentary cross-sectional view which shows a part of stator of the rotary electric machine of 2nd Embodiment which concerns on this invention. It is a partial cross section figure which shows a part of stator of the rotary electric machine of 3rd Embodiment which concerns on this invention. It is a fragmentary cross-sectional view which shows a part of stator of the rotary electric machine of 4th Embodiment which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Inner type | mold rotor, 15 ... Outer type | mold rotor, 21 ... Outer type stator iron core, 22 ... Inner peripheral surface, 23 ... Hollow part, 25 ... Inner type stator iron core, 26 ... Outer peripheral surface, 29 ... Stator Slot, 31 ... 1st coil, 32 ... 2nd coil, 33 ... Single layer coil, 35 ... Insulation against ground, 41 ... Nonmagnetic slot wedge, 42 ... Nonmagnetic spacer under wedge, 43 ... Nonmagnetic spacer at groove bottom, 51 ... Magnetic spacer between coils, 52 ... Under-wedge magnetic spacer

Claims (5)

A substantially cylindrical rotor having a rotation axis as a rotation center;
A substantially cylindrical shape having a hollow portion extending in the rotation axis direction and surrounding the rotor, and a plurality of stator slots extending in the rotation axis direction are formed on an inner peripheral side surface of the hollow portion, A stationary stator core,
A coil disposed in each stator slot and extending in the direction of the rotation axis;
A non-magnetic slot wedge extending in the direction of the rotation axis and attached to be fitted closer to the opening side of the stator slot than the coil in the stator slot;
A spacer that extends in the direction of the rotation axis, is inserted to contact the coil in the stator slot, and has magnetism;
A rotating electrical machine comprising: A substantially hollow cylindrical rotor that rotates about a rotation axis;
A substantially cylindrical shape disposed so as to penetrate through the hollow portion of the rotor, and a plurality of stator slots extending in the direction of the rotation axis are formed on the outer peripheral side surface, and the stator core fixed stationary,
A coil disposed in each stator slot and extending in the direction of the rotation axis;
A non-magnetic slot wedge extending in the direction of the rotation axis and attached to be fitted closer to the opening side of the stator slot than the coil in the stator slot;
A spacer that extends in the direction of the rotation axis, is inserted to contact the coil in the stator slot, and has magnetism;
A rotating electrical machine characterized by comprising:   The rotating electrical machine according to claim 1, wherein the spacer includes a sub-wedge spacer inserted between the non-magnetic slot wedge and the coil. The coil includes a first coil disposed on the bottom side in the stator slot, and a second coil disposed on the opening side of the stator coil in the stator slot,
The spacer includes an inter-coil spacer inserted between the first coil and the second coil;
The rotating electrical machine according to any one of claims 1 to 3, wherein A hollow cylinder disposed around the rotation axis, and a plurality of armature slots extending in the direction of the rotation axis formed on at least one of an outer peripheral surface and an inner peripheral surface of the hollow portion;
A coil disposed in each armature slot and extending in the direction of the rotation axis;
A non-magnetic slot wedge that extends in the direction of the rotation axis and is attached to be fitted closer to the opening side of the armature slot than the coil in the armature slot;
A spacer that extends in the direction of the rotation axis, is inserted so as to be in contact with the coil in the armature slot, and has magnetism;
A rotating electric machine comprising:

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