JP2012050263A - Reluctance motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reluctance motor, constructed in a cantilever structure, with the rotor supported on only one side of axial direction, and having plural layers of slits (flux barriers) raised in a convex shape from the outer to the inner periphery of the rotor provided in its radial direction, the reluctance motor being designed to improve torque characteristics.SOLUTION: The reluctance motor according to the prevent invention is a reluctance motor constructed in a cantilever structure, with the rotor supported on only side, in which the rotor, without a shaft hole in which the revolving shaft is to be fitted, comprises: a first rotor core having as many slits raised in a convex shape from the outer to the inner periphery as the number of poles formed therein; and a second rotor core including a shaft hole in which the revolving shaft is to be fitted, and having as many slits raised in a convex shape from the outer to the inner periphery as the number of poles formed therein, where the number of slits in the first rotor core is greater than that in the second rotor core.

Description

  The present invention relates to a reluctance motor using reluctance torque. Specifically, the present invention relates to a rotor core and a shaft of a reluctance motor.

  The reluctance motor is a synchronous motor that generates driving torque using reluctance torque. The reluctance torque is a torque generated by the difference between the inductance Ld in the center line direction (d axis) of the rotor magnetic pole and the inductance Lq in the center line direction (q axis) between the magnetic poles. Torque also increases.

That is, the torque τ of the reluctance motor can be obtained by the following equation (1).
τ = P × (Ld−Lq) × id × iq (1)
here,
P: Number of pole pairs Ld: d-axis inductance Lq: q-axis inductance id: d-axis current iq: q-axis current.

  Therefore, it is important to increase the d-axis inductance Ld and decrease the q-axis inductance Lq. In order to increase Ld, it is necessary to make the rotor shape such that the magnetic flux in the d-axis direction easily passes, and in order to decrease Lq, the magnetic flux in the q-axis direction is difficult to pass. In order to realize this, it is effective to provide a portion called a slit (flux barrier) in which the magnetic flux hardly passes in the rotor.

  It is a common method to arrange slits that protrude from the outer periphery of the rotor toward the inner periphery in parallel in a plurality of layers in the radial direction.

  In order to improve the power factor of the reluctance motor, the outline of the strip magnetic path and slit is formed in a hyperbola with respect to the cross section orthogonal to the motor rotation axis, and the strip magnetic path and slit are made wider as they are closer to the motor shaft. A reluctance motor has been proposed (see, for example, Patent Document 1).

  In this reluctance motor, the multi-layered slits are orthogonal throughout the q-axis magnetic flux, so that the salient pole ratio Ld / Lq is increased and the motor power factor is improved.

Japanese Patent Laid-Open No. 2002-199675

  However, when there is a restriction on the outer diameter of the rotor, if the ratio of the slit width in the radial direction is increased too much, the magnetic path width in the d-axis direction will inevitably be reduced, and Ld will be reduced to reduce the torque. Resulting in.

  In addition, the size of the slit that can be arranged in the rotor is limited by the inner diameter of the shaft insertion hole provided in the center of the rotor.

  The present invention has been made to solve the above-described problems, and has a cantilever structure in which the rotor is supported only on one side in the axial direction, and is a slit that protrudes from the outer periphery of the rotor toward the inner periphery ( Provided is a reluctance motor capable of improving torque characteristics in a reluctance motor provided with a plurality of layers in the radial direction.

The reluctance motor according to the present invention is a reluctance motor having a cantilever structure in which a rotor is supported only on one side.
The rotor is
A first rotor core in which there are no shaft holes into which the rotation shaft is fitted, and a plurality of slits that are convex from the outer periphery toward the inner periphery are formed for the number of poles;
A second rotor core having a shaft hole into which the rotating shaft is fitted, and a plurality of slits that are convex from the outer periphery toward the inner periphery, and formed by the number of poles;
The number of slits in the first rotor core is larger than the number of slits in the second rotor core.

  In the reluctance motor according to the present invention, since the number of slits in the first rotor core is larger than the number of slits in the second rotor core, torque characteristics can be improved.

It is a figure shown for a comparison and is a cross-sectional view of a general reluctance motor 500. It is a figure shown for a comparison and is a cross-sectional view of the stator 510 of a general reluctance motor 500. The figure shown for a comparison and the cross-sectional view of the rotor 520 of the general reluctance motor 500. FIG. AA sectional drawing of FIG. BB sectional drawing of FIG. It is a figure shown for a comparison and is a magnetic flux diagram of the d-axis direction of the general reluctance motor 500. FIG. It is a figure shown for a comparison, The magnetic flux diagram of the q-axis direction of the general reluctance motor 500 (The position of the rotor 520 differs 45 degrees (mechanical angle) from FIG. 6). The cross-sectional view of the rotor 620 which is shown for comparison and has a slit width larger than that of the rotor 520. The cross-sectional view of the rotor 720 which added the slit to the inner peripheral side of the rotor 520 in the figure shown for a comparison. FIG. 6 shows the first embodiment, and is a longitudinal sectional view of a rotor 120 (a CC sectional view of FIGS. 11 and 12). DD sectional drawing of FIG. EE sectional drawing of FIG. FIG. 5 is a diagram illustrating the first embodiment, and shows a d-axis inductance between a rotor (basic shape) stacked only with the second rotor core 121-2 and a rotor stacked only with the first rotor core 121-1. The figure which shows (Ld) and q-axis inductance (Lq). FIG. 5 shows the first embodiment, and shows torques of a rotor having a basic rotor shape that is laminated only by the second rotor core 121-2 and a rotor that is laminated only by the first rotor core 121-1. Figure. It is a figure which shows Embodiment 1, and is a longitudinal cross-sectional view of the rotor 220 of the modification 1 (FF sectional drawing of FIG. 16, FIG. 17). GG sectional drawing of FIG. HH sectional drawing of FIG. FIG. 5 shows the first embodiment and is a plan view of a first end plate 225a. FIG. 5 shows the first embodiment and is a plan view of a second end plate 225b. FIG. 5 shows the first embodiment, and is a longitudinal sectional view of a rotary compressor 800. FIG. 5 shows the first embodiment and is a plan view of a first end plate 225c. FIG. 5 shows the first embodiment and is a plan view of a second end plate 225d. It is a figure which shows Embodiment 1, and is a longitudinal cross-sectional view of the rotor 320 of the modification 2 (JJ sectional drawing of FIG. 24, FIG. 25). KK sectional drawing of FIG. MM sectional drawing of FIG. It is a figure which shows Embodiment 1, and is a longitudinal cross-sectional view of the rotor 420 of the modification 3 (NN sectional drawing of FIG. 24, FIG. 25). FIG. 27 is a sectional view taken along the line PP in FIG. 26. QQ sectional drawing of FIG. FIG. 5 shows the first embodiment and is a plan view of a first end plate 425a. FIG. 5 shows the first embodiment and is a plan view of a second end plate 425b. FIG. 5 shows the first embodiment and is a plan view of a first end plate 425c. FIG. 5 shows the first embodiment and is a plan view of a second end plate 425d. FIG. 9 shows the first embodiment, and is a transverse cross-sectional view of a first rotor core 921-1 of a rotor 920 of Modification Example 4; FIG. 9 shows the first embodiment, and is a transverse cross-sectional view of a second rotor core 921-2 of a rotor 920 of Modification Example 4;

Embodiment 1 FIG.
First, for comparison, a general reluctance motor 500 will be described with reference to FIGS.

  1 to 7 are diagrams for comparison, FIG. 1 is a cross-sectional view of a general reluctance motor 500, FIG. 2 is a cross-sectional view of a stator 510 of the general reluctance motor 500, and FIG. 4 is a cross-sectional view of a rotor 520 of a typical reluctance motor 500, FIG. 4 is a cross-sectional view taken along line AA of FIG. 3, FIG. 5 is a cross-sectional view taken along line BB of FIG. FIG. 7 is a magnetic flux diagram in the q-axis direction of a general reluctance motor 500 (the position of the rotor 520 is 45 ° (mechanical angle) different from FIG. 6).

  A general reluctance motor 500 shown in FIG. 1 has a cylindrical stator 510 and a gap having a predetermined radial dimension (not shown, the radial dimension being substantially the same) in the inner peripheral portion of the cylindrical stator 510. And a rotor 520 provided through a certain space.

  The stator 510 has a configuration similar to that of a permanent magnet type motor or induction motor using a permanent magnet as a rotor. As shown in FIG. 2, the stator 510 is formed by laminating a predetermined number of cylindrical stator cores 511 (magnetic steel plates (plate thickness is about 0.1 to 1.0 mm) punched into a predetermined shape). And windings 513 inserted through slots 515 formed at substantially equal intervals in the circumferential direction along the inner peripheral edge of the stator core 511 via insulating members (not shown). Prepare.

  The stator core 511 is a core back 512 having a cylindrical outer peripheral portion, and teeth 514 (tooth portions) are radially formed inward from the core back 512 in a plurality of radial directions. In the example of FIG. 2, the number of slots 515 is 24, and the number of teeth 514 is 24, which is the same as the number of slots 515.

  The winding 513 is, for example, a three-phase winding (for example, Y connection) of distributed winding or concentrated winding.

  The rotor 520 is disposed on the inner periphery of the stator 510 via a predetermined gap (a space in which the radial dimension is substantially constant).

  The rotor 520 will be described with reference to FIGS. 3 to 7. The rotor 520 may be simply referred to as a rotor. The number of poles of the rotor 520 is four. A rotor 520 disposed via a predetermined gap on the inner peripheral portion of the stator 510 that generates a rotating magnetic field has a rotor core 521 configured by laminating a predetermined number of electromagnetic steel plates punched into a predetermined shape; And a rotating shaft 524 fitted to the rotor core 521.

  The electromagnetic steel sheet constituting the rotor core 521 is provided with a first slit portion 522a, a second slit portion 522b, a third slit portion 522c, and a fourth slit portion 522d.

  The first slit portion 522a, the second slit portion 522b, the third slit portion 522c, and the fourth slit portion 522d have their apexes directed to the shaft holes into which the rotating shaft 524 is fitted, and from one d-axis. It has an arc shape (reverse arc shape) toward the other d axis (in the example of FIG. 3, the angle between one d axis and the other d axis is 90 ° (mechanical angle)). And these 1st slit part 522a, 2nd slit part 522b, 3rd slit part 522c, and 4th slit part 522d are as many as the said pole number (FIG. 3 4 poles) of the rotor core 521. It is formed at predetermined intervals in the circumferential direction along the outer periphery.

  The electromagnetic steel plates constituting the rotor core 521 are laminated by, for example, a general caulking 523 that fixes and cuts and raises protrusions formed on each electromagnetic steel plate by electromagnetic steel plates adjacent in the axial direction.

  The plurality of first slit portions 522a, second slit portions 522b, third slit portions 522c, and fourth slit portions 522d function as flux barriers. Therefore, q (quadrature) axis magnetic flux (magnetic flux from one q axis to the other q axis) from the stator core 511 is made difficult to pass (the q axis magnetic path is small), while the first slit portion 522a, The magnetic path (iron core part) between the second slit part 522b, the third slit part 522c, and the fourth slit part 522d is d (direct) magnetic flux from the stator core 511 (from one d axis to the other). (magnetic flux to the d-axis) is passed (d-axis magnetic path is large).

  When the rotor is in the position shown in FIG. 6, the magnetic flux passes through the steel plate portion between the slits (there is no hindrance to the flow of magnetic flux). On the other hand, when the rotor is at the position shown in FIG. 7, the slits obstruct the flow of the magnetic flux, so that the magnetic flux mainly tries to pass through the thin portion between the slit end and the outer periphery of the rotor. However, if a certain amount or more of magnetic flux tries to pass through the thin wall portion, magnetic saturation occurs, and the magnetic flux cannot pass any more. As a result, the magnetic flux passes between the slits as shown in FIG. 7, and the polarity generated in both the direction in which the magnetic flux easily passes in the rotor (d-axis) and the direction in which the magnetic flux does not easily pass (q-axis) is lost. Small or impossible to generate.

  As described above, the direction in which the magnetic flux easily flows in the rotor is defined as the d-axis direction, and the direction in which the magnetic flux does not easily flow through the slit is defined as the q-axis direction.

  Since the magnetic flux passes through the iron core (magnetic steel plate) as a magnetic path, as shown in FIG. 3, the arc shape is directed from the one d-axis to the other d-axis with the apex facing the shaft hole into which the rotating shaft 524 is fitted. By providing the first slit portion 522a, the second slit portion 522b, the third slit portion 522c, and the fourth slit portion 522d, a magnetic flux can flow as shown in FIG. The direction in which the magnetic flux flows is the d-axis direction, and the magnetic flux does not easily flow through the slits (the first slit portion 522a, the second slit portion 522b, the third slit portion 522c, and the fourth slit portion 522d). Direction is the q-axis direction. A saliency is generated in the rotor 520 by the d-axis through which the magnetic flux flows and the q-axis through which the magnetic flux is difficult to flow, and reluctance torque can be generated.

  However, when the slit width Ls (FIG. 3) is small or the magnetic flux passing through the rotor 520 becomes large, magnetic saturation occurs, and the magnetic flux passes through the slit. If this happens, the saliency is lost and the torque is reduced.

  FIG. 8 is a view for comparison, and is a cross-sectional view of a rotor 620 having a slit width larger than that of the rotor 520. In order to achieve higher torque, one effective measure is to reduce the q-axis inductance, that is, to make it difficult for the magnetic flux in the q-axis direction to flow. For this purpose, it is preferable to make the slit width Ls1 larger than the slit width Ls of the rotor 520 (Ls1> Ls) or increase the number of slit layers as in the rotor 620 shown in FIG.

  However, if the slit width Ls1 is larger than the slit width Ls of the rotor 520 (Ls1> Ls) as in the rotor 620 shown in FIG. 8, the magnetic path width Lf1 in the d-axis direction rotates as shown in FIG. It becomes smaller than the magnetic path width Lf in the d-axis direction of the child 520 (Lf1 <Lf), and Ld becomes smaller.

  Further, the reason why the number of slit layers is increased is that, for example, a fifth slit portion 722e (shown by a broken line) to be added covers the shaft hole into which the rotating shaft 724 is fitted, such as the rotor 720 shown in FIG. In reality, it cannot be added.

  In FIGS. 8 and 9, the reference numerals that are not described are changed from “5” to “6” or “7” in the first digit of the reference numerals shown in FIG. Or the thing with the same alphabet points out the same part. For example, the caulking 623 is the same as the caulking 523.

  10 to 12 show the first embodiment. FIG. 10 is a longitudinal sectional view of the rotor 120 (a sectional view taken along the line CC in FIGS. 11 and 12). FIG. 11 is a sectional view taken along the line DD in FIG. 12 is a cross-sectional view taken along the line EE of FIG.

  The rotor 120 of the first embodiment will be described with reference to FIGS. 10 to 12. The rotor 120 may be simply called a rotor. The rotor 120 according to the first embodiment includes a first rotor core 121-1 configured by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape (there is no shaft hole and the number of slits per magnetic pole). 5) and a second rotor core 121-2 (having a shaft hole and having four slits per magnetic pole) constituted by laminating a predetermined number of magnetic steel sheets punched into a predetermined shape. And a rotating shaft 124 fitted to the second rotor core 121-2. The rotor 120 is a four-pole rotor.

  In the rotor 120 according to the first embodiment, the rotor core 121 includes two types of first rotor cores 121-1 (no shaft hole and five slits per magnetic pole) and a second rotor core. It is characterized in that it is composed of 121-2 (having an axial hole and the number of slits is 4 per magnetic pole).

  Since the first rotor core 121-1 does not have a shaft hole into which the rotating shaft 124 is fitted, the number of slits can be increased as compared with the second rotor core 121-2 having a shaft hole. In addition, although the 1st rotor core 121-1 adds the slit for 1 layer here, it is preferable that the number of the slits to add is larger.

  However, it is assumed that the motor has a cantilever structure in which the rotor is supported on one side. For example, a motor such as a rotary compressor having a cantilever rotor used in a refrigeration cycle is an object.

  By combining the two types of the first rotor core 121-1 and the second rotor core 121-2, a higher torque can be achieved than a motor composed of only the second rotor core 121-2. I can plan.

  As shown in FIG. 11, the first rotor core 121-1 includes a first slit portion 122a, a second slit portion 122b, a third slit portion 122c, from the inner peripheral side toward the outer peripheral side. A fourth slit portion 122d is provided, and a fifth slit portion 122e is formed inside the first slit portion 122a.

  The first slit portion 122a, the second slit portion 122b, the third slit portion 122c, the fourth slit portion 122d, and the fifth slit portion 122e are oriented with one apex at the center of the rotor. Is an arc shape (reverse arc shape) from the other d axis (in the example of FIG. 11, the angle between one d axis and the other d axis is 90 ° (mechanical angle)). In addition, the first slit portion 122a, the second slit portion 122b, the third slit portion 122c, the fourth slit portion 122d, and the fifth slit portion 122e have the same number of poles (four poles in FIG. 11). ) Are formed at predetermined intervals in the circumferential direction along the outer periphery of the first rotor core 121-1.

  The electromagnetic steel plates constituting the first rotor iron core 121-1 are laminated by, for example, a general caulking 123 that fixes the cut and raised protrusions formed on each electromagnetic steel plate by fitting the electromagnetic steel plates adjacent to each other in the axial direction. Is done. However, the fixing of the electromagnetic steel plate of the first rotor core 121-1 is not limited to the caulking 123. For example, fixing with rivets, welding or the like may be used.

  In addition, as shown in FIG. 12, the second rotor core 121-2 includes a first slit portion 122a, a second slit portion 122b, and a third slit portion from the inner peripheral side toward the outer peripheral side. 122c and a fourth slit portion 122d are formed.

  The first slit portion 122a, the second slit portion 122b, the third slit portion 122c, and the fourth slit portion 122d face the apex toward the center of the rotor, and from one d axis to the other d axis (see FIG. In the example of FIG. 12, the angle between one d-axis and the other d-axis is 90 ° (mechanical angle)). And these 1st slit part 122a, 2nd slit part 122b, 3rd slit part 122c, and 4th slit part 122d are the 2nd rotor by the said pole number (FIG. 12 4 poles). It is formed at predetermined intervals in the circumferential direction along the outer periphery of the iron core 121-2.

  The electromagnetic steel sheets constituting the second rotor core 121-2 are laminated by a general caulking 123 that is fixed by fitting the cut and raised protrusions formed on each electromagnetic steel sheet with the adjacent electromagnetic steel sheets in the axial direction. Is done. However, the fixing of the electromagnetic steel plate of the second rotor core 121-2 is not limited to the caulking 123. For example, fixing with rivets, welding or the like may be used.

  The first rotor core 121-1 shown in FIG. 11 to which the slit (fifth slit portion 122e) is added in this way is in the q-axis direction with respect to the second rotor core 121-2 shown in FIG. The flow of magnetic flux can be suppressed, and Lq can be reduced. Further, since the magnetic path width in the d-axis direction is not reduced by the addition of the slit (fifth slit portion 122e), Ld is not reduced. That is, since the magnetic path width in the d-axis direction between the first slit portions 122a of the second rotor core 121-2 shown in FIG. 12 is wider than other portions, the fifth slit portion 122e is provided there. Even if two are added, the magnetic path width between the first slit part 122a and the fifth slit part 122e and the magnetic path width between the fifth slit part 122e are larger than the magnetic path widths of other parts. There is no narrowing.

  13 and 14 show the first embodiment, and FIG. 13 shows only the rotor (basic shape) laminated with only the second rotor core 121-2 and the first rotor core 121-1. FIG. 14 is a diagram showing a d-axis inductance (Ld) and a q-axis inductance (Lq) with a laminated rotor, FIG. 14 is a diagram showing a rotor having a rotor basic shape laminated with only the second rotor core 121-2; It is a figure which shows a torque with the rotor laminated | stacked only with the rotor core 121-1. For comparison, both have the same thickness (rotor core width).

  As can be seen from FIG. 13, it can be confirmed that the Lq of the rotor laminated with only the first rotor core 121-1 is reduced with respect to the basic shape Lq. However, the Ld of the rotor laminated with only the first rotor core 121-1 is not reduced with respect to the basic shape Ld.

  Further, as described above, since the torque generated by the reluctance motor is proportional to (Ld−Lq), the rotor laminated only by the first rotor core 121-1 has higher torque than the basic shape. It can be confirmed from FIG.

  In the rotor 120 of the present embodiment, two types of rotor cores (first rotor core 121-1 and second rotor core 121-2) are separately stacked and combined in the axial direction to form one unit. It is a rotor. The rotating shaft 124 is inserted from the end of the rotor 120 from the second rotor core 121-2 side having a shaft hole. The depth at which the rotating shaft 124 is inserted is such that when the rotating shaft 124 comes into contact with the first rotor core 121-1 having no shaft hole, the first rotor core 121-1 and the second rotor core 121-. Since there is a possibility that the first rotor core 121-1 may come off from the boundary surface with the shaft 2, it is safe if there is a slight margin (gap, see FIG. 10) between the boundary surface and the shaft end.

  The rotation shaft 124 receives stress (centrifugal force) during rotation of the rotor 120 at the second rotor core 121-2 into which the rotation shaft 124 is inserted. However, since the first rotor core 121-1 is fixed to the second rotor core 121-2 by caulking 123 to the second rotor core 121-2, the stress when the rotor 120 rotates. It is weak against (centrifugal force). Therefore, it is preferable that the thickness L1 of the first rotor core 121-1 is smaller than the thickness L2 of the second rotor core 121-2 (L1 <L2).

  15 to 17 show the first embodiment. FIG. 15 is a longitudinal sectional view of the rotor 220 according to the first modified example (cross-sectional view taken along line FF in FIGS. 16 and 17). FIG. -G sectional drawing and FIG. 17 are HH sectional views of FIG.

  In order to increase the strength against stress during rotation, end plates (first end plate 225a and second end plate 225b) are provided on both axial end surfaces of the rotor core 221, as shown in FIG. Also good. With reference to FIGS. 15 to 17, the rotor 220 of Modification 1 will be described. The rotor 220 may be simply called a rotor. The rotor 220 of the first modification is a first rotor core 221-1 configured by laminating a predetermined number of magnetic steel sheets punched into a predetermined shape (no shaft hole and 5 slits per magnetic pole). And a second rotor core 221-2 (having a shaft hole and the number of slits is 4 per magnetic pole) configured by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape. Rotor core 221, rotary shaft 224 fitted to second rotor core 221-2, first end plate 225a and second end plate 225b provided at both axial ends of the rotor, and rotor A rivet 226 that penetrates the iron core 221 and integrates the first and second end plates 225 a and 225 b with the rotor core 221 is provided. The rotor 120 is a four-pole rotor.

  As shown in FIG. 16, the first rotor core 221-1 has four rivet insertion holes 227 for the rivets 226 formed in the vicinity of the outer periphery of the rotor on the d-axis. A difference from the first rotor core 121-1 (FIG. 11) is that a rivet insertion hole 227 is formed instead of the caulking 123. Note that the reference numerals not described in FIG. 16 are changed from “1” to “2” in the first digit with respect to the reference numerals shown in FIG. Point to the same location. For example, the first slit portion 222a is the same as the first slit portion 122a.

  In the second rotor core 221-2, as shown in FIG. 17, four rivet insertion holes 227 for the rivets 226 are formed in the vicinity of the outer periphery of the rotor on the d-axis. A difference from the second rotor core 121-2 (FIG. 12) is that a rivet insertion hole 227 is formed instead of the caulking 123. Note that the reference numerals not described in FIG. 17 are the same as those shown in FIG. 12 except that the first digit is changed from “1” to “2”. Point to the same location. For example, the first slit portion 222a is the same as the first slit portion 122a.

  18 and 19 show the first embodiment. FIG. 18 is a plan view of the first end plate 225a, and FIG. 19 is a plan view of the second end plate 225b.

  As shown in FIG. 18, the first end plate 225a provided at the axial end of the first rotor core 221-1 is disk-shaped and is substantially equidistant in the circumferential direction in the vicinity of the outer peripheral edge. Four rivet insertion holes 225a-1 are formed. Since the first rotor core 221-1 has no shaft hole, the first end plate 225a also has no shaft hole. However, when using in common with the 2nd end plate 225b mentioned later, you may form a shaft hole in the 1st end plate 225a.

  As shown in FIG. 19, the second end plate 225b provided at the axial end of the second rotor core 221-2 is disk-shaped and is substantially equidistant in the circumferential direction in the vicinity of the outer peripheral edge. Four rivet insertion holes 225b-1 are formed. In addition, a shaft hole 225b-2 into which the rotating shaft 224 is inserted is formed at the center of the second end plate 225b.

  For example, when the rotor 220 is used in a rotary compressor, requirements required for the rotor 220 will be described. First, the rotary compressor will be briefly described. FIG. 20 shows the first embodiment, and is a longitudinal sectional view of the rotary compressor 800.

  An example of the rotary compressor 800 shown in FIG. 20 is a vertical type in which the inside of the sealed container 870 is high-pressure. A compression element 820 is housed in the lower part of the hermetic container 870. A reluctance motor 810, which is an electric element that drives the compression element 820, is accommodated above the compression element 820 in the upper part of the sealed container 870.

  Refrigerating machine oil 890 that lubricates each sliding portion of the compression element 820 is stored at the bottom of the sealed container 870.

  First, the configuration of the compression element 820 will be described. A cylinder 801 in which a compression chamber is formed has a cylinder chamber (not shown) that has a substantially circular outer periphery and a space that is substantially circular in plan view. The cylinder chamber is open at both axial ends. The cylinder 801 has a predetermined axial height in a side view.

  Parallel vane grooves that communicate with a cylinder chamber that is a substantially circular space of the cylinder 801 and extend in the radial direction are provided so as to penetrate in the axial direction.

  In addition, a back chamber, which is a substantially circular space in plan view, communicating with the vane groove is provided on the back surface (outside) of the vane groove.

  A suction port (not shown) through which suction gas from the refrigeration cycle passes through the cylinder 801 passes through the cylinder chamber from the outer peripheral surface of the cylinder 801.

  The cylinder 801 is provided with a discharge port (not shown) in which the vicinity of the edge of the circle forming the cylinder chamber which is a substantially circular space (the end surface on the reluctance motor 810 side) is cut out.

  The material of the cylinder 801 is gray cast iron, sintered, carbon steel, or the like.

  The rolling piston 802 rotates eccentrically in the cylinder chamber. The rolling piston 802 has a ring shape, and the inner periphery of the rolling piston 802 is slidably fitted to the eccentric shaft portion of the rotating shaft 224.

  The rolling piston 802 is assembled so that there is always a constant gap between the outer periphery of the rolling piston 802 and the inner wall of the cylinder chamber of the cylinder 801.

  The material of the rolling piston 802 is alloy steel containing chromium or the like.

  The vane 803 is accommodated in the vane groove of the cylinder 801, and the vane 803 is always pressed against the rolling piston 802 by a vane spring 808 provided in the back pressure chamber. In the rotary compressor 800, since the inside of the sealed container 870 is at a high pressure, when the operation is started, a force due to the differential pressure between the high pressure in the sealed container 870 and the pressure in the cylinder chamber acts on the back surface (back pressure chamber side) of the vane 803. Therefore, the vane spring 808 is mainly used for the purpose of pressing the vane 803 against the rolling piston 802 when the rotary compressor 800 is started (when there is no difference between the pressure in the sealed container 870 and the cylinder chamber).

  The shape of the vane 803 is a flat shape (the thickness in the circumferential direction is smaller than the length in the radial direction and the axial direction).

  High-speed tool steel is mainly used as the material for the vane 803.

  The main bearing 804 is slidably fitted to a main shaft portion (a portion above the eccentric shaft portion and fitted to the rotor 220) of the rotating shaft 224, and includes a cylinder chamber (including a vane groove) of the cylinder 801. ) Is closed (reluctance motor 810 side).

  The main bearing 804 includes a discharge valve (not shown). However, it may be attached to either one or both of the main bearing 804 and the sub-bearing 805.

  The main bearing 804 has a substantially inverted T shape when viewed from the side.

  The sub-bearing 805 is slidably fitted to the sub-shaft portion (the portion below the eccentric shaft portion) of the rotating shaft 224, and the other end surface (refrigerating machine oil 890) of the cylinder chamber (including the vane groove) of the cylinder 801. Block the side).

  The secondary bearing 805 is substantially T-shaped in a side view.

  The material of the main bearing 804 and the sub bearing 805 is the same as the material of the cylinder 801, such as gray cast iron, sintered, carbon steel, and the like.

  A discharge muffler 807 is attached to the main bearing 804 on the outer side (reluctance motor 810 side). The high-temperature and high-pressure discharge gas discharged from the discharge valve of the main bearing 804 enters the discharge muffler 807 and is then discharged from the discharge muffler 807 into the sealed container 870. However, there may be a discharge muffler 807 on the auxiliary bearing 805 side.

  A suction muffler 821 is provided beside the hermetic container 870, which sucks low-pressure refrigerant gas from the refrigeration cycle and prevents liquid refrigerant from being directly sucked into the cylinder chamber of the cylinder 801 when the liquid refrigerant returns. The suction muffler 821 is connected to the suction port of the cylinder 801 via the suction pipe 822. The main body of the suction muffler 821 is fixed to the side surface of the sealed container 870 by welding or the like.

  A terminal 824 (referred to as a glass terminal) connected to a power source that is a power supply source is fixed to the sealed container 870 by welding. In the example of FIG. 20, a terminal 824 is provided on the upper surface of the sealed container 870. A lead wire 823 from a reluctance motor 810 that is an electric element is connected to the terminal 824.

  A discharge pipe 825 having both ends opened is inserted into the upper surface of the sealed container 870. The discharge gas discharged from the compression element 820 is discharged from the sealed container 870 through the discharge pipe 825 to the external refrigeration cycle.

  A general operation of the rotary compressor 800 will be described. When electric power is supplied from the terminal 824 and the lead wire 823 to the stator 812 of the reluctance motor 810 that is an electric element, the rotor 220 rotates. Then, the rotating shaft 224 fixed to the rotor 220 rotates, and accordingly, the rolling piston 802 rotates eccentrically in the cylinder chamber of the cylinder 801. A space between the cylinder chamber of the cylinder 801 and the rolling piston 802 is divided into two by a vane 803. As the rotary shaft 224 rotates, the volume of these two spaces changes, the volume gradually increases on one side and the refrigerant is sucked from the suction muffler 821, and the volume gradually decreases on the other side. The refrigerant gas is compressed. The compressed discharge gas is discharged once from the discharge muffler 807 into the sealed container 870, passes through a reluctance motor 810 that is an electric element, and is discharged from the discharge pipe 825 on the upper surface of the sealed container 870 to the outside of the sealed container 870. The

When the discharge gas (including the refrigerating machine oil 890) passing through the reluctance motor 810, which is an electric element, is not provided in the first end plate 225a and the second end plate 225b of the rotor 220, the discharge gas passes therethrough. ,
(1) Air gap including slot opening of stator 812;
(2) Stator notch disposed on the outer periphery of the stator 812.
In this case, the flow path area is insufficient.

  Therefore, it is necessary to provide openings in the first end plate 225a and the second end plate 225b of the rotor 220 for allowing the discharge gas to pass therethrough. In the rotor core 221, slits (first slit portion 222a, second slit portion 222b, third slit portion 222c, and fourth slit portion 222d), which are spaces, penetrate in the axial direction. If the first end plate 225a and the second end plate 225b of the rotor 220 are provided with openings that communicate with the slits of the rotor core 221, the slits of the rotor core 221 (the first slit portion 222a and the second end plate 225b). The second slit portion 222b, the third slit portion 222c, and the fourth slit portion 222d) can be used as discharge gas flow paths.

  21 and 22 show the first embodiment. FIG. 21 is a plan view of the first end plate 225c, and FIG. 22 is a plan view of the second end plate 225d.

  The first end plate 225c and the second end plate 225d shown in FIGS. 21 and 22 are slits of the rotor core 221, respectively (first slit portion 222a, second slit portion 222b, and third slit portion 222c. , Open portions 225c-3 and 225d-3 communicating with the fourth slit portion 222d). Here, the shapes of the openings 225c-3 and 225d-3 are the same as the slits (the first slit 222a, the second slit 222b, the third slit 222c, and the fourth slit 222d). However, it is not limited to this shape. The shape is not limited as long as it is an opening communicating with the slits of the rotor core 221 (the first slit portion 222a, the second slit portion 222b, the third slit portion 222c, and the fourth slit portion 222d). The rivet insertion holes 225c-1 and 225d-1 are the same as the rivet insertion holes 225a-1 and 225b-1. The shaft hole 225d-2 is the same as the shaft hole 225b-2.

  Thus, by providing the first end plate 225c and the second end plate 225d on the rotor 220, for example, the reluctance motor 810 having a cantilever structure (the stator 812 and the rotor 220) is added to the rotary compressor 800. Even when installed, the strength of the rotor 220 can be increased by the end plates (first end plate 225c, second end plate 225d) without hindering the flow of the discharge gas (including the refrigerator oil 890). .

  As described above, in the rotor 120 of the first embodiment, the rotor core 121 has two types of the first rotor core 121-1, which has no shaft hole and the number of slits is five per magnetic pole. 2 rotor cores 121-2 (having shaft holes and having four slits per magnetic pole), q-axis inductance Lq is reduced, and high torque of the reluctance motor can be expected.

  Moreover, in order to supplement the strength of the rotor core portion without the shaft hole, the strength of the rotor can be increased by providing an end plate (example of the rotor 220).

  Further, by providing the end plate with an opening communicating with the slit of the rotor core 221, for example, a reluctance motor 810 having a cantilever structure (stator 812, rotor 220 (with end plate)) is provided in the rotary compressor 800. Even when installed, the strength of the rotor 220 can be increased by the end plates (first end plate 225c, second end plate 225d) without hindering the flow of the discharge gas (including the refrigerator oil 890). .

  23 to 25 are diagrams showing the first embodiment. FIG. 23 is a longitudinal sectional view of a rotor 320 according to the second modification (a sectional view taken along line JJ in FIGS. 24 and 25). FIG. -K sectional drawing, FIG. 25 is MM sectional drawing of FIG.

  In the rotor 120 shown in FIG. 10 and the rotor 220 shown in FIG. 15 described above, the first rotor cores 121-1, 212-1 having no shaft hole and five slits per magnetic pole and shaft holes are provided. A combination of the four second rotor cores 121-2 and 221-2 with the number of slits per magnetic pole was used to increase the torque. However, it is not easy to accurately match the axes of the first rotor cores 121-1 and 212-1 having no shaft holes with the central axes of the rotary shafts 124 and 224.

  Accordingly, a rotor 320 of Modification 2 that solves the above-described problem will be described with reference to FIGS. 23 to 25.

  The rotor 320 of the second modification is configured by a rotor core 321 composed of a first rotor core 321-1 and a second rotor core 321-2, a large diameter portion 324a, and a small diameter portion 324b. A rotating shaft 324.

The rotor 320 of the second modification differs from the rotor 220 of the first modification in the following points.
(1) The first rotor core 321-1 has a shaft hole into which the small diameter portion 324b of the rotation shaft 324 is inserted at the center. However, the diameter of the shaft hole of the first rotor core 321-1 is smaller than the diameter of the shaft hole of the second rotor core 321-2;
(2) The rotating shaft 324 includes a large diameter portion 324a and a small diameter portion 324b.

  As shown in FIG. 24, the first rotor core 321-1 has a shaft hole into which the small-diameter portion 324b of the rotary shaft 324 is inserted into the first rotor core 121-1 shown in FIG. It has been added. The diameter of this shaft hole is smaller than the diameter of the shaft hole of the second rotor core 321-2.

  As shown in FIG. 25, the second rotor core 321-2 has the same configuration as the second rotor core 121-2 shown in FIG. However, although the first digit is changed from “1” to “3” with respect to the code shown in FIG. 12, the same numeral or alphabet in other digits indicates the same part. For example, the caulking 323 is the same as the caulking 123.

  The rotor 320 of Modification 2 is smaller than the diameter of the shaft hole of the second rotor core 321-2, but the small-diameter portion 324b of the rotation shaft 324 is also inserted into the first rotor core 321-1. A shaft hole is added. Therefore, the rotor 320 of the modified example 2 is more accurate than the rotor 120 shown in FIG. 10 with the axes (axis centers) of the first rotor core 321-1 and the second rotor core 321-2. It becomes possible to match.

  Further, in the rotor 320 of the second modified example, since the small diameter portion 324b of the rotating shaft 324 is also inserted into the first rotor core 321-1, the strength against stress during rotation is higher than that of the rotor 120 shown in FIG. Increase.

  The increase in torque does not change because the number of slits in the first rotor core 321-1 is larger than the number of slits in the second rotor core 321-2.

  Since the strength of the rotor increases as the diameter of the rotating shaft increases, it is preferable that L3 and L4 in FIG. 23 satisfy the relationship L3 <L4.

  26 to 32 are diagrams showing the first embodiment. FIG. 26 is a longitudinal sectional view of the rotor 420 of the third modification (NN sectional view of FIGS. 24 and 25), and FIG. 27 is a diagram of FIG. -P sectional view, FIG. 28 is a QQ sectional view of FIG. 26, FIG. 29 is a plan view of the first end plate 425a, FIG. 30 is a plan view of the second end plate 425b, and FIG. FIG. 32 is a plan view of the plate 425c, and FIG. 32 is a plan view of the second end plate 425d.

  In order to further increase the strength of the rotor 320 of the second modification, an end plate may be added to the rotor in the same manner as the rotor 220 of the first modification.

  A rotor 420 according to Modification 3 will be described with reference to FIGS. 26 to 32. As illustrated in FIG. 26, the rotor 420 of the third modification is different from the rotor 320 of the second modification in that end plates (first end plate 425 a, second end plate 425 b, first end plate 425 c, second End plate 425d) and a rivet 426 for integrating them is added.

  A rotor 420 according to the third modification includes a rotor core 421 including a first rotor core 421-1 and a second rotor core 421-2, a large diameter portion 424a, and a small diameter portion 424b. A rotary shaft 424, a first end plate 425a provided at the axial end of the first rotor core 421-1, and a second end provided at the axial end of the second rotor core 421-2. An end plate 425b and a rivet 426 that penetrates the rotor core 421 and integrates the first end plate 425a and the second end plate 425b with the rotor core 421 are provided.

  As shown in FIG. 27, the first rotor core 421-1 has four rivet insertion holes 427 for the rivets 426 in the vicinity of the rotor outer periphery on the d-axis. A difference from the first rotor core 321-1 (FIG. 24) is that a rivet insertion hole 427 is formed instead of the caulking 323. 27, the reference numerals not described in FIG. 27 are changed from “3” to “4” in the first digit with respect to the reference numerals shown in FIG. Point to the same location. For example, the first slit portion 422a is the same as the first slit portion 322a.

  In the second rotor core 421-2, as shown in FIG. 28, four rivet insertion holes 427 for the rivets 426 are formed in the vicinity of the rotor outer periphery on the d-axis. A difference from the second rotor core 321-2 (FIG. 25) is that a rivet insertion hole 427 is formed instead of the caulking 323. Note that the reference numerals not described in FIG. 28 are the same as those shown in FIG. 25 except that the first digit is changed from “3” to “4”. Point to the same location. For example, the first slit portion 422a is the same as the first slit portion 322a.

  In the rotor 420 of the third modification, the first end plate 425a and the second end plate 425b and the rotor core 421 are integrated by the rivet 426, so that the strength of the rotor core is higher than that of the rotor 320 of the second modification. Can be further increased.

  As shown in FIG. 29, the first end plate 425a provided at the axial end of the first rotor core 421-1 is disk-shaped and is substantially equidistant in the circumferential direction in the vicinity of the outer peripheral edge. Four rivet insertion holes 425a-1 are formed. The first end plate 425a is formed with a shaft hole 425a-2 into which the small diameter portion 424b of the rotation shaft 424 is inserted.

  As shown in FIG. 30, the second end plate 425b provided at the axial end of the second rotor core 421-2 is disk-shaped and is substantially equidistant in the circumferential direction in the vicinity of the outer peripheral edge. Four rivet insertion holes 425b-1 are formed. Further, a shaft hole 425b-2 into which the rotation shaft 424 is inserted is formed at the center of the second end plate 425b.

  When the rotor 420 of the third modification is used in the rotary compressor 800, an opening communicating with the slit of the rotor core 421 is required on the end plate. In that case, openings 425c-3 and 425d-3 are provided as in the first end plate 425c and the second end plate 425d shown in FIGS. The openings 425c-3 and 425d-3 communicate with the slits (the first slit 422a, the second slit 422b, the third slit 422c, and the fourth slit 422d) of the rotor core 421, respectively. ing. Here, the shapes of the openings 425c-3 and 425d-3 are the same as the slits (the first slit 422a, the second slit 422b, the third slit 422c, and the fourth slit 422d). However, it is not limited to this shape. Any shape can be used as long as it is an opening communicating with the slits of the rotor core 421 (the first slit portion 422a, the second slit portion 422b, the third slit portion 422c, and the fourth slit portion 422d). The rivet insertion holes 425c-1 and 425d-1 are the same as the rivet insertion holes 425a-1 and 425b-1. The shaft holes 425c-2 and 425d-2 are the same as the shaft holes 425a-2 and 425b-2.

  Thus, by providing the first end plate 425c and the second end plate 425d on the rotor 420, for example, the cantilevered reluctance motor 810 (stator 812, rotor 420) is added to the rotary compressor 800. Even when installed, the strength of the rotor 420 can be increased by the end plates (the first end plate 425c and the second end plate 425d) without hindering the flow of the discharge gas (including the refrigerator oil 890). .

  FIGS. 33 and 34 are diagrams showing the first embodiment. FIG. 33 is a cross-sectional view of the first rotor core 921-1 of the rotor 920 of the fourth modification, and FIG. 34 is the rotor 920 of the fourth modification. It is a cross-sectional view in the 2nd rotor core 921-2.

  The rotor 920 of the fourth modification is intended to reduce torque ripple. Similarly to the rotors 120 to 420, the rotor 920 includes two types of first rotor cores 921-1 and second rotor cores 921-2.

  Although it is common to use skew caulking as one of the methods for reducing torque ripple, stress acts on the caulking portion, so that the magnetic characteristics are deteriorated. Therefore, it is not preferable to arrange the skew caulking in a location that becomes a magnetic path in the d-axis direction, and it is preferable to arrange it in the q-axis direction.

  The skew caulking is a well-known technique disclosed in, for example, JP-A-5-42332. A caulking part (skew caulking) consisting of a cut and raised protrusion hole provided in communication with a skew escape hole formed in the electromagnetic steel sheet is fitted into an adjacent electromagnetic steel sheet and connected by caulking. Further, it is formed by rotating a die that receives the laminated iron core in order to form a predetermined skew.

  The rotor 920 of the modification 4 is different from the rotors 120 to 420 in that the caulking or rivet insertion hole on the d axis is abolished and the fourth outermost slits 122d, 222d, and 322d on the q axis are eliminated. , 422d, an arcuate skew caulking 928 is provided. The skew caulking 928 is formed along the outer peripheral edge of the rotor 920, and includes a cut and raised protrusion hole provided in communication with the skew escape hole and a cut and raised protrusion.

  When the rotor core is formed by laminating the first rotor core 921-1 and the second rotor core 921-2 of the rotor 920 of the modified example 4, the cut and raised provided in communication with the skew escape hole The slits (first slit portion 922a, second slit portion 922b, third slit portion 922c, and fifth slit portion 922e) are made electromagnetic by a skew caulking 928 composed of a ridge protrusion hole and a raised protrusion. Each steel plate has a skewed shape with a predetermined angle shift. Thereby, torque ripple can be reduced.

  120 rotor, 121 rotor core, 121-1 first rotor core, 121-2 second rotor core, 122a first slit portion, 122b second slit portion, 122c third slit portion, 122d fourth slit portion, 122e fifth slit portion, 123 caulking, 124 rotating shaft, 220 rotor, 221 rotor core, 221-1 first rotor core, 221-2 second rotor core, 222a 1st slit part, 222b 2nd slit part, 222c 3rd slit part, 222d 4th slit part, 222e 5th slit part, 223 caulking, 224 Rotating shaft, 225a 1st end plate, 225a -1 rivet insertion hole, 225b second end plate, 225b-1 rivet insertion hole, 225b-2 shaft hole, 225c first end plate 225c-1 rivet insertion hole, 225d-2 shaft hole, 225c-3 opening, 225d second end plate, 225d-1 rivet insertion hole, 225d-3 opening, 226 rivet, 227 rivet insertion hole, 320 rotor, 321 rotor core, 321-1 first rotor core, 321-2 second rotor core, 322a first slit portion, 322b second slit portion, 322c third slit portion, 322d Fourth slit portion, 322e Fifth slit portion, 323 caulking, 324 rotating shaft, 324a large diameter portion, 324b small diameter portion, 420 rotor, 421 rotor core, 421-1 first rotor core, 421 -2 2nd rotor iron core, 422a 1st slit part, 422b 2nd slit part, 422c 3rd slit part, 422 Fourth slit portion, 422e Fifth slit portion, 424 Rotating shaft, 425a First end plate, 425a-1 Rivet insertion hole, 425a-2 Shaft hole, 425b Second end plate, 425b-1 Rivet insertion Hole, 425b-2 shaft hole, 425c first end plate, 425c-1 rivet insertion hole, 425c-2 shaft hole, 425c-3 opening, 425d second end plate, 425d-1 rivet insertion hole 425d-2 shaft hole, 425d-3 opening, 426 rivet, 427 rivet insertion hole, 500 reluctance motor, 510 stator, 511 stator core, 512 core back, 513 winding, 514 teeth, 515 slot, 520 Rotor, 521 Rotor core, 522a 1st slit part, 522b 2nd slit part, 522c 1st 3 slit portion, 522d 4th slit portion, 523 caulking, 524 rotating shaft, 620 rotor, 621 rotor core, 622a first slit portion, 622b second slit portion, 622c third slit portion, 622d Fourth slit portion, 623 caulking, 624 rotation shaft, 720 rotor, 721 rotor core, 722a first slit portion, 722b second slit portion, 722c third slit portion, 722d fourth slit portion, 722e Fifth slit portion, 723 caulking, 724 rotary shaft, 800 rotary compressor, 801 cylinder, 802 rolling piston, 803 vane, 804 main bearing, 805 secondary bearing, 807 discharge muffler, 808 vane spring, 810 reluctance motor, 812 Stator, 820 pressure Element, 821 Suction muffler, 823 Lead wire, 824 terminal, 825 Discharge pipe, 870 Sealed container, 890 Refrigerator oil, 920 Rotor, 921-1 First rotor core, 921-2 Second rotor core, 922a First slit portion, 922b Second slit portion, 922c Third slit portion, 922e Fifth slit portion, 928 Skew caulking.

Claims (9)

In a reluctance motor with a cantilever structure in which the rotor is supported only on one side,
The rotor is
A first rotor core in which there are no shaft holes into which the rotation shaft is fitted, and a plurality of slits that are convex from the outer periphery toward the inner periphery are formed for the number of poles;
A second rotor core having the shaft hole into which the rotating shaft is fitted, and having a plurality of slits that are convex from the outer periphery toward the inner periphery,
The reluctance motor according to claim 1, wherein the number of slits in the first rotor core is greater than the number of slits in the second rotor core.   Of the plurality of slits in the first rotor core, a slit provided in addition to the plurality of slits in the second rotor core is formed in the portion corresponding to the shaft hole of the second rotor core. The reluctance motor according to claim 1.   3. The rotary shaft is inserted into the second rotor core with a predetermined gap left to the vicinity of the boundary between the first rotor core and the second rotor core. The reluctance motor described. In a reluctance motor with a cantilever structure in which the rotor is supported only on one side,
The rotor is
A first rotor core having a shaft hole into which a small-diameter portion of the rotating shaft is fitted, and having a plurality of slits that are convex from the outer periphery toward the inner periphery,
A second rotor core having a shaft hole into which the large-diameter portion of the rotating shaft is fitted, and a plurality of slits that are convex from the outer periphery toward the inner periphery, and formed by the number of poles;
The reluctance motor according to claim 1, wherein the number of slits in the first rotor core is greater than the number of slits in the second rotor core.   5. The reluctance motor according to claim 1, wherein an axial length of the first rotor core is shorter than an axial length of the second rotor core. 6. An end plate is provided at one axial end of the first rotor core and one axial end of the second rotor core;
6. The reluctance motor according to claim 1, wherein the first rotor core, the second rotor core, and the end plate are integrated with a rivet.   The reluctance motor according to claim 1, wherein the first rotor core and the second rotor core are stacked by caulking.   8. The reluctance motor according to claim 7, wherein the caulking is a skew caulking comprising a cut and raised protrusion hole provided in communication with a skew escape hole and a cut and raised protrusion.   The reluctance motor according to claim 8, wherein the skew caulking is provided in a q-axis direction.

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