JP2008022672A - Reluctance motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase magnetic saliency of a rotor core formed by laminating punched steel plates. <P>SOLUTION: First punched plates 6 are laminated on second punched plates 7 which are higher in the magnetic saliency than the first punched plates 6 to form a rotor core 8. The first punched plate 6 is arranged at both ends respectively in the axial direction of the rotor core 8, four pieces of first punched plates 6 are arranged in the middle of the rotor core so as to equally divide the rotor core 8 in the laminating direction length into, for example, five portions, and ten pieces of second punched plates 7 for example are respectively arranged between these first punched plates 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a reluctance motor having a rotor core formed by stacking punched plates made of steel plates.

  The reluctance motor is formed in the rotor core with reluctance (magnetic resistance) small and easy to pass magnetic flux and reluctance large and difficult to pass magnetic flux alternately in the same number as the number of poles. The reluctance torque is generated using the difference in the gap magnetic flux density between them (see, for example, Patent Document 1).

FIG. 9 shows a rotor core 100 of such a reluctance motor. The rotor core 100 is configured by laminating steel plates punched into a circle. Further, the rotor core 100 is formed from a plurality of slits 101 a to 101 c that are formed in an arc shape opposite to the outer peripheral circle and are arranged concentrically with the top of the arc facing the center of the rotor core 100. Slit groups 101 are provided at equal intervals along the circumferential direction by the number of poles. The slit group 101 functions as a flux barrier (magnetic flux barrier), so that the reluctance small portion and the large reluctance portion are formed. As a result, the rotor core 100 is provided with a so-called magnetic saliency. ing.
Japanese Patent No. 3286542

  Both ends of each of the slits 101a to 101c in the rotor core 100 having the above configuration are close to the outer periphery of the rotor core 100, and narrow bridge portions 100a are formed on the outer sides of the both ends. As a result, a magnetic path passing through the bridge portion 100a is formed, and a leakage magnetic flux passing through the magnetic path is generated. As a result, the magnetic saliency decreases and the reluctance torque generated decreases.

  In order to solve such a problem, it is conceivable to eliminate the bridge portion 100a to increase the magnetic saliency and efficiently generate the reluctance torque. However, if the bridge part 100a is eliminated, the parts connected by the bridge part 100a are divided, and the integrally formed punched steel sheets are separated. It is considered that it is very difficult to form the rotor core 100 by laminating such steel plates separated from each other.

  The present invention has been made in view of the above circumstances, and its purpose is to increase the magnetic saliency of the rotor core in the structure of the rotor core by stacking punched plates made of steel plates. The object is to provide a reluctance motor that can be used.

  The reluctance motor of the present invention is a reluctance motor having a rotor core formed by laminating punched plates made of steel plates, wherein the punched plate has a circular shape, and a portion that magnetically functions as a salient pole has a circular outer periphery. By forming a hole in a portion sandwiched between portions that function as salient poles in order to form in a plurality of locations, a main portion having a portion that functions as the salient pole in a plurality of locations, and the hole from the main portion The edge of the circular outer periphery is separated from the connecting island portion separated by a gap, and both ends of the hole are located near the circular outer periphery, and the outer peripheral edge portion of the hole is left outside the both ends of the hole. A first punched plate as a bridging portion for connecting to the first and the second punched plate as a whole and a circular shape having the same size as the first punched plate as a whole; In order to form the salient pole, by forming a gap between the ends of the first punched plate at the same position as the hole in the circular outer periphery in a portion sandwiched between the portions that function as the salient pole to form It is composed of a main part having a part to be functioned at a plurality of locations, and a second punched plate divided into separated island parts separated from the main part, the main part of the second punched plate, At least one of the first islands is connected so that each of the separation islands is connected to the main part of the first punched plate and the connecting island part connected to the main part by the bridging part. The rotor core is configured by stacking a plurality of the second punching plates on the punching plate.

  According to the present invention, the first punched plate connects the main portion and the connection island portion by the bridge portion, so that the main portion and the connection island portion are held integrally. On the other hand, the second punched plate forms a portion that functions magnetically as a salient pole by a spaced gap that is open at both ends at a circular outer periphery. Polarity increases. Then, the divided main portion and the separation island portion of the second punching plate are connected to the main portion and the connecting island portion that are integrally held with the first punching plate, respectively, so that at least one first Since the rotor core is configured by stacking a plurality of second punched plates against the punched plate, each punched plate can be held integrally and the magnetic saliency of the rotor core can be increased. The torque generated can be increased.

(First embodiment)
A first embodiment of the present invention will be described below with reference to FIGS.
FIG. 6 is a longitudinal side view of the reluctance motor 1 cut along a plane including the rotation axis center. The reluctance motor 1 includes a cylindrical stator 2, a rotor 3 disposed inside the stator 2 with a gap, brackets 4 and 5 fixed on both sides in the axial direction of the stator 2, It is comprised.

  Among these, the external perspective view of the rotor 3 is shown in FIG. The rotor 3 is laminated and fixed with a first punched plate (indicated by reference numeral 6 in FIG. 2) and a second punched plate (indicated by reference numeral 7 in FIG. 3) formed by punching electromagnetic steel sheets. A rotary shaft 10 made of, for example, stainless steel is press-fitted and fixed in a shaft hole 9 formed in the central portion of the rotor core 8 having a substantially cylindrical shape. The bearings 11 and 12 are fitted to the rotary shaft 10 so as to be positioned near both axial ends of the rotor core 8.

  Further, the rotor core 8 has both end surfaces in the axial direction (upper and lower surfaces in FIGS. 5 and 6) covered with, for example, a mold resin 13 (corresponding to a resin) integrally molded with a PET resin. 13 is also filled in the rotor core 8. That is, the rotor core 8 is covered with the mold resin 13 except for the portion facing the inner surface of the stator 2.

  On the other hand, as shown in FIG. 6, the stator 2 is configured by winding a plurality of stator windings 15 on a stator core 14 obtained by punching electromagnetic steel sheets and stacking and fixing them. Brackets 4 and 5 having a U-shaped cross section formed of, for example, aluminum are fixed to both sides of the stator core 14 in the axial direction, and the stator 2 is sandwiched between the brackets 4 and 5. It is attached.

  Of these, the bearing 12 of the rotor 3 is fitted into the bearing recess 5 a formed at the center of the inner surface of the bracket 5, while the bearing 11 is inserted into the bearing hole 4 a formed at the center of the bracket 4. It is mated. In addition, the rotary shaft 10 is inserted into the bearing hole 4a so that the upper end of the rotary shaft 10 protrudes upward in FIG. With such a configuration, the rotor 3 is rotatably attached to the brackets 4 and 5 via the bearings 11 and 12.

  FIG. 2 is a plan view of the first punched plate 6 for constituting the rotor core 8. The outer periphery of the first punching 6 has a circular shape, and a circular hole portion 16 forming the shaft hole 9 for press-fitting the rotary shaft 10 is formed at the center. Further, the first punching plate 6 is formed in an arc shape opposite to the outer peripheral circle, and a plurality of holes arranged concentrically with the apex of the arc facing the center of the first punching plate 6. Four flux barriers 17 composed of 17a to 17c are provided at equal intervals along the circumferential direction.

  A substantially X-shaped portion surrounded by the four holes 17c is a main portion 6a, and salient pole portions 18 having a small reluctance (magnetic resistance) and functioning magnetically as salient poles at four ends of the main portion 6a. Is formed. Moreover, the site | part between the hole 17c and the hole 17b, the site | part between the hole 17b and the hole 17a, and the site | part on the outer peripheral side from the hole 17a are set as connection island part 6b-6d, respectively. With such a configuration, the reluctance at a portion between the salient pole portion 18 and another adjacent salient pole portion 18 is increased. Moreover, the both ends of each hole 17a-17c are approaching the outer periphery of the 1st punching board 6, and the narrow bridge | bridging part 6e (equivalent to a bridge part) is formed in the outer side of the said both ends, respectively. The

  Moreover, in the 1st punching board 6, the straight line which connects the both ends of connection island part 6b-6d, the edge part of the outer peripheral side of the main part 6a, and the edge part of the outer peripheral side of the main part 6a, and the center hole part 16 A circular caulking portion 6f (details will be described later) for stacking and fixing other punched plates is provided near the hole portion 16 above.

  FIG. 3 is a plan view of the second punched plate 7 for constituting the rotor core 8. The second punching plate 7 has substantially the same shape as the first punching plate 6, the outer periphery thereof is circular, and a hole having the same shape as the hole 16 of the first punching plate 6 is in the center. 19 is formed. Further, four flux barriers 20 including a plurality of spaced gap portions 20a to 20c formed substantially in the same manner as the holes 17a to 17c of the first punching plate 6 are provided at equal intervals along the circumferential direction. .

  However, each of the gaps 20 a to 20 c extends to the outer periphery of the second punching plate 7 at both ends. That is, the separation gaps 20a to 20c are opened to the outer periphery in the radial direction of the second punching plate 7 by extending the both end portions of the holes 17a to 17c of the first punching plate 6 as they are and eliminating the bridge portion 6e. It is in the form of letting.

  A substantially X-shaped portion surrounded by the four spaced-apart gaps 20c serves as a main portion 7a, and salient pole portions 21 having small reluctance and magnetically functioning as salient poles are formed at four ends of the main portion 7a. Is done. Further, a part between the separation gap part 20c and the separation gap part 20b, a part between the separation gap part 20b and the separation gap part 20a, and a part on the outer peripheral side from the separation gap part 20a are respectively separated from the separation island part 7b to 7b. 7d.

  With such a configuration, the reluctance at a portion between the salient pole portion 21 and another adjacent salient pole portion 21 is increased. Moreover, the main part 7a and the isolation | separation island parts 7b-7d are divided | segmented by the separation | spacing space | gap parts 20a-20c, and the 2nd punching board 7 is in the disjointed state. The second punching plate 7 is also provided with a circular caulking portion 7f (details will be described later) at the same position as the caulking portion 6f in the first punching plate 6.

  FIG. 4 is a longitudinal side view taken along line XX of FIG. 3 and shows a cross section of a caulking portion 7 f provided on the main portion 7 a of the second punching plate 7. As shown in FIG. 4, the caulking portion 7f is formed with a protruding piece 22 (corresponding to a convex portion) having a substantially V shape and having a flat portion at the deepest portion so as to protrude downward in FIG. Yes. By forming the projecting piece 22, a projecting piece trace hole 23 (corresponding to a recess) is formed above the projecting piece 22.

  In addition, although not shown in figure, the other caulking part 7f of the 2nd punching board 7 and the caulking part 6f of the 1st punching board 6 are also provided with the same protruding piece and protruding piece trace hole. With such a configuration, for example, when the second punching plate 7 is stacked on the first punching plate 6, the projecting piece 22 of the second punching plate 7 is a trace of the projecting piece of the preceding first punching plate 6. Fit into the hole. That is, each recessed part and convex part are fitted.

Subsequently, a process of forming the rotor core 8 by laminating the first punching plate 6 and the second punching plate 7 having the above-described configuration will be described.
The first punching plate 6 and the second punching plate 7 are formed by sequentially punching strip-shaped electromagnetic steel plates with a progressive press device (not shown). In this progressive press apparatus, a station for punching holes 17a to 17c and a station for punching bridge 6e are provided. In the station for punching bridge 6e, the upper die is lowered or not lowered. If the upper die is not lowered, the first punching plate 6 in which the holes 17a to 17c are formed leaving the bridge portion 6e is formed. If the upper die is lowered, the bridge portion 6e is formed. Is also punched out to form the second punched plate 7 in which the spaced gaps 20a to 20c are formed.

  And in the last station of a progressive press apparatus, an external shape is punched and the 1st punching board 6 and the 2nd punching board 7 are cut | disconnected from a strip | belt-shaped electromagnetic steel plate. At this time, the punched plate punched first is received by a pedestal supported by a spring, and the punched plate punched this time is overlaid on the uppermost punched plate received on the pedestal. At the same time, they are joined by the concave and convex fitting of the caulking portions 6f and 7f described above.

FIG. 1 shows an external perspective view of a rotor core 8 configured by the above-described steps. The first punched plates 6 are disposed at both ends of the rotor core 8 in the axial direction, respectively, and in the middle thereof, four pieces are arranged so that the stacking direction length of the rotor core 8 is divided into, for example, five equal parts. The first punching plate 6 is arranged. For example, ten second punching plates 7 are arranged between the first punching plates 6.
The rotor core 8 is a cavity extending in the axial direction by connecting the holes 17a to 17c of the first punched plate 6 and the spaced gap portions 20a to 20c of the second punched plate 7 to each other. Portions 8a to 8c are formed.

Next, the operation and effect of the above configuration will be described.
Since the first punching plate 6 constituting the rotor core 8 has the bridge portions 6e at both ends of the holes 17a to 17c, as in the prior art, the magnetic material passing through the bridge portion 6e. A road will be formed. As a result, the difference between the gap magnetic flux density between the stator 2 and the salient pole portion 18 and the gap magnetic flux density between the stator 2 and the portion where the flux barrier 17 is formed is reduced. That is, the saliency of the salient pole portion 18 is the same as that of the prior art.

  On the other hand, the second punching plate 7 has both end portions of the separation gaps 20a to 20c communicating with the outer periphery of the second punching plate 7 in the plane direction, and thus passes through these both end portions. No magnetic path is formed. Thereby, the difference between the gap magnetic flux density between the stator 2 and the salient pole portion 21 and the gap magnetic flux density between the stator 2 and the portion where the flux barrier 20 is formed increases. That is, the flux barrier 20 including the spaced gap portions 20a to 20c can effectively function as a magnetic flux barrier, and can increase the saliency of the salient pole portion 21.

  Since the rotor core 8 is formed by laminating six first punching plates 6 and fifty second punching plates 7, the entire rotor core 8 is used by the amount of the second punching plate 7 used. As a result, the reluctance torque can be generated.

  Further, in the step of laminating the first punching plate 6 and the second punching plate 7, since the caulking portions 6 f and 7 f are coupled by the concave and convex fitting, the separated island portion of the second punching plate 7 is used. 7b to 7d are coupled to the separated island portions 7b to 7d of the other adjacent second punching plate 7 or the connecting island portions 6b to 6d of the adjacent first punching plate 6 and may be separated. Absent. Therefore, each punched plate can be held without using a separate holding member in the middle of the lamination.

  Further, since the rotor core 8 is configured to be covered with the mold resin 13 integrally molded with PET resin, the mechanical strength is improved. Moreover, this can reduce vibration during rotation and reduce noise due to vibration.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG.
In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted and only a different part is demonstrated hereafter. FIG. 7 is a view corresponding to FIG. 1 in the first embodiment, and shows an external perspective view of the rotor core 30. In the rotor core 30, first punched plates 6 are disposed at both ends in the axial direction, and 54 second punched plates 7 are disposed between the first punched plates 6, for example.

  When the rotor core 30 having the above-described configuration is used for the rotor 3 of the reluctance motor 1, the amount of the second punched plate 7 that is formed by stacking four more than the rotor core 8 in the first embodiment, The saliency of the rotor core 30 as a whole can be further increased, and thereby a larger reluctance torque can be generated.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG.
In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted and only a different part is demonstrated hereafter. FIG. 8 is a view corresponding to FIG. 1 in the first embodiment, and shows an external perspective view of the rotor core 40. The rotor core 40 has hollow portions 40a to 40c that extend in the axial direction and are formed in the same manner as the hollow portions 8a to 8c in the first embodiment. In the hollow portions 40a to 40c, for example, permanent magnets 41a to 41c made of sintered neodymium are embedded.

  These permanent magnets 41a to 41c have substantially the same shape as the corresponding hollow portions 40a to 40c. The permanent magnets 41a to 41c are magnetized so as to have the same polarity in the radial direction and to have different polarities in the circumferential direction.

  When the rotor core 40 having the above-described configuration is used for the rotor 3 of the reluctance motor 1, in addition to the reluctance torque, torque due to the permanent magnet field is also generated, so that the torque generated as a whole of the reluctance motor 1 can be increased. it can.

The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following modifications or expansions are possible.
The number of holes 17a to 17c of the first punching plate 6 and the number of spaced gaps 20a to 20c of the second punching plate 7 and the ratio of stacking the first punching plate 6 and the second punching plate 7 are generated. It can be appropriately increased or decreased based on the magnitude of the reluctance torque to be applied and the mechanical strength of the rotor core.

The rotor 3 may have another pole number configuration such as a six-pole configuration.
If there is no problem in the mechanical strength against the centrifugal force of the rotor 3, the mold resin 13 does not have to be filled in the rotor core. Further, the processing itself with the mold resin 13 may be eliminated.
The rotor core 40 in the third embodiment may be configured, for example, such that the permanent magnet 41a is embedded only in the cavity 40a, or the permanent magnets 41a, 41c are embedded in the cavity 40a, 40c. The arrangement can be appropriately changed according to the magnitude of torque to be generated.

1 is an external perspective view of a rotor core showing a first embodiment of the present invention. Top view of the first punched plate Plan view of second punched plate Vertical side view showing the caulking part External perspective view of rotor Longitudinal side view showing main part of reluctance motor FIG. 1 equivalent diagram showing a second embodiment of the present invention FIG. 1 equivalent view showing a third embodiment of the present invention 1 equivalent diagram showing the prior art

Explanation of symbols

In the drawings, 1 is a reluctance motor, 6 is a first punching plate, 7 is a second punching plate, 6a and 7a are main portions, 6b to 6d are connection island portions, 6e is a bridge portion (bridge portion), and 7b. ˜7d is a separation island part, 8 is a rotor core, 13 is a mold resin (resin), 17a to 17c are holes, 18, 21 are salient pole parts (saliency poles), 20a to 20c are spaced gap parts, and 22 is a salient part. A piece (convex portion), 23 is a protruding piece trace hole (concave portion), 30 is a rotor core, 40 is a rotor core, 40a to 40c are hollow portions, and 41a to 41c are permanent magnets.

Claims (6)

In a reluctance motor having a rotor core constructed by stacking punched plates made of steel plates,
The punched plate is
Forming a hole in a portion sandwiched between portions that function as salient poles in order to form a circular shape and magnetically function as salient poles at a plurality of locations on the outer periphery of the circle, thereby functioning as salient poles Divided into a main part having a plurality of portions and a connecting island part separated from the main part via the hole, and both ends of the hole are located near the outer circumference of the circle, and outside the both ends of the hole. A first punched plate having a left circular outer peripheral edge portion as a bridge portion for connecting the connecting island portion to the main portion;
As a whole, a circular shape having the same size as the first punched plate is formed, and a portion that functions as a salient pole is formed between a portion that functions as a salient pole in order to form a portion that functions magnetically as a salient pole at a plurality of locations on the outer circumference A main part having a plurality of portions functioning as the salient poles separated from the main part by forming spaced-apart gaps having both ends opened at a circular outer periphery at the same position as the hole of the first punched plate A second punched plate divided into separated island parts,
Consisting of
The main portion of the second punched plate and the separation island portion are respectively connected to the main portion of the first punched plate and the connecting island portion connected to the main portion by the bridge portion. A reluctance motor, wherein the rotor core is configured by stacking a plurality of the second punching plates on at least one of the first punching plates so as to be connected to each other.   2. The reluctance motor according to claim 1, wherein the stacked punching plate is connected to another punching plate by fitting a concave portion and a convex portion.   The rotor core is formed by stacking so that at least one first punched plate is disposed every time a predetermined number of the second punched plates are stacked. The reluctance motor according to 1 or 2.   Among the punched plates constituting the rotor core, punched plates at both axial ends are the first punched plates, and the punched plates stacked between the first punched plates are the second punched plates. The reluctance motor according to claim 1, wherein the reluctance motor is provided.   The rotor core is formed in the rotor core by connecting the hole portion of the stacked first punched plate and the spacing gap portion of the stacked second punched plate. 5. The reluctance motor according to claim 1, wherein a permanent magnet is embedded in at least a part of the hollow portion extending in the axial direction. The rotor core has at least both axial end surfaces thereof covered with a resin, and / or the hole portion of the first punching plate and the spacing gap portion of the second punching plate. The reluctance motor according to claim 1, wherein the resin is filled with resin.

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