JP4666500B2 - Rotor of permanent magnet embedded motor - Google Patents

Description

  The present invention relates to a permanent magnet embedding in which a permanent magnet is positioned in the circumferential direction by shifting the permanent magnet insertion hole toward the inside or outside in the radial direction with respect to the gap portion of the permanent magnet insertion hole into which the permanent magnet is not inserted. The present invention relates to a rotor of a built-in motor.

Conventionally, long holes of the rotor are formed wider in the circumferential direction than the permanent magnets, and gaps are provided on both sides in the circumferential direction of the permanent magnets loaded in these long holes, and both ends of the nonmagnetic metal pipe inserted into these gaps. A permanent magnet type brushless DC motor is proposed in which the permanent magnet is fixed in the long hole by causing the protruding end to protrude from the permanent magnet and plastically deforming these protruding ends (see, for example, Patent Document 1).
JP 2002-10544 A

  The rotor of the conventional permanent magnet type brushless DC motor has provided the space | gap for preventing the leakage of magnetic flux in the circumferential direction both sides of the permanent magnet insertion hole, and prevented the leakage of the magnetic flux. However, since there is a gap to prevent magnetic flux leakage, the permanent magnet cannot be positioned, and the permanent magnet has been positioned by providing a fixing projection or inserting a non-magnetic pipe into the gap. . However, the provision of the fixing protrusions causes magnetic flux leakage, which is a factor that deteriorates efficiency. In addition, when positioning is performed using a nonmagnetic pipe, there is a problem that the cost becomes high.

  The present invention has been made to solve the above-described problems, and does not require a large-scale permanent magnet positioning device for positioning the permanent magnet, and does not deteriorate the characteristics. An object is to provide a rotor for a motor.

  A rotor of a permanent magnet embedded motor according to the present invention includes a rotor core on which a plurality of electromagnetic steel plates are laminated, and a long hole shape that is provided in the rotor core so as to penetrate in the axial direction and is long in the circumferential direction. Two permanent magnet insertion holes, gaps formed at both ends in the circumferential direction in the permanent magnet insertion holes, and two sheets of electromagnetic steel plates that are formed in communication with the gaps between the gaps and separated by at least a predetermined distance The permanent magnet is provided at both ends of the permanent magnet insertion portion, the permanent magnet inserted into the permanent magnet insertion portion, and the permanent magnet. And an end plate made of a non-magnetic material that prevents the removal of the metal.

  The rotor of the embedded permanent magnet motor according to the present invention can position the permanent magnet in the permanent magnet insertion hole with the above-described configuration, and can also leak magnetic flux by communicating the gap and the permanent magnet insertion hole. Therefore, it is possible to obtain substantially the same characteristics as a state in which the permanent magnets are not arranged on the inner side and the outer side.

Embodiment 1 FIG.
1 to 3 are views showing a rotor of a general permanent magnet embedded motor, FIG. 1 is a plan view of an electromagnetic steel plate, FIG. 2 is a perspective view of the rotor, and FIG. 3 is a sectional view of the rotor. is there.
As the electromagnetic steel plate 1 of the rotor of the general embedded permanent magnet motor shown in FIG. 1, one having a thickness of 0.2 to 0.5 mm is used. The punched electromagnetic steel sheet 1 shown in FIG. 1 has four long-hole permanent magnet insertion holes 1a arranged in the circumferential direction, and a rivet insertion hole for inserting a rivet (described later) inside the permanent magnet insertion hole 1a. Four 1b are provided, and a shaft insertion hole 1c in which a shaft (described later) is fixed by press-fitting or the like is formed near the center of the electromagnetic steel sheet 1.

  The rotor 2 shown in FIG. 2 forms a rotor core 2c by laminating a plurality of the electromagnetic steel plates 1 shown in FIG. 1, and inserts four permanent magnets (described later) into the permanent magnet insertion holes 1a of the rotor core 2c. Then, the end plates 3 made of a non-magnetic material are aligned with both ends of the rotor 2 in the axial direction so that the permanent magnets do not fall out of the permanent magnet insertion holes 1 a, and the whole is caulked and fixed with four rivets 4. Then, the shaft 5 is inserted into and fixed to the shaft insertion hole 1c by press fitting, shrink fitting or the like.

  As shown in the cross-sectional view of FIG. 3, the permanent magnet 6 is inserted into the center of the permanent magnet insertion hole 1a, and when the length of the permanent magnet 6 is shorter than the permanent magnet insertion hole 1a, the circumferential direction of the permanent magnet 6 At both ends, a gap 1d where the permanent magnet 6 does not exist is formed. Since the gap 1d exists, the permanent magnet 6 can move in the permanent magnet insertion hole 1a, and thus cannot be positioned. Therefore, the permanent magnet 6 moves in the permanent magnet insertion hole 1a during start-up, operation, and deceleration, causing noise and vibration.

  Further, when the permanent magnet 6 moves in the permanent magnet insertion hole 1a, the balance of the magnetic force is lost, and the cogging torque, the distortion of the induced voltage, and the torque ripple increase. Accordingly, in order to fix the position of the permanent magnet 6, a protrusion that matches the width of the permanent magnet 6 with respect to the permanent magnet insertion hole 1 a and the diameter of the gap 1 d of the permanent magnet insertion hole 1 a in which the permanent magnet 6 is not inserted. Measures such as narrowing the width in the direction relative to the radial width of the permanent magnet 6 have been taken.

  However, the gap 1d of the permanent magnet insertion hole 1a in which the permanent magnet 6 is not inserted is to prevent leakage of magnetic flux between the magnetic poles, and magnetic flux leakage is increased by providing protrusions or narrowing the radial width. It led to the deterioration of the characteristics.

  Further, in the small permanent magnet embedded motor, the width of the gap 1d is small, the ratio of the projections is large, the leakage of magnetic flux becomes remarkable, and the characteristics are deteriorated.

  4 to 7 show the first embodiment, FIG. 4 is a plan view of the electromagnetic steel sheet 1, FIG. 5 is a cross-sectional view of a rotor of a permanent magnet embedded motor, and FIG. 6 is another permanent magnet embedded. FIG. 7 is a partially enlarged cross-sectional view of a rotor of a permanent magnet embedded motor.

  As shown in FIG. 4, the permanent magnet 6 is not inserted into the permanent magnet insertion portion 1m into which the permanent magnets 6 of the long permanent magnet insertion holes 1a arranged in the circumferential direction of the electromagnetic steel sheet 1 are inserted. It is displaced by a predetermined length radially inward from the gap 1d at both ends in the circumferential direction. However, the permanent magnet insertion portion 1m into which the permanent magnet 6 is inserted communicates with the gap portion 1d. This is for suppressing leakage of magnetic flux from the permanent magnet 6.

  As shown in FIG. 5, the permanent magnet 6 is inserted into the permanent magnet insertion portion 1 m of the rotor core 2 c, end plates 3 (see FIG. 2) are provided at both ends of the rotor 2, and the whole is caulked and fixed with rivets 4. To do.

  By comprising in this way, a level | step difference is formed in the both ends of the permanent magnet insertion part 1m in which the permanent magnet 6 is inserted, and the permanent magnet 6 is positioned by the level | step difference. Thus, the permanent magnet 6 is positioned without the permanent magnet 6 moving in the permanent magnet insertion hole 1a during operation.

  Further, the length for shifting the permanent magnet insertion portion 1m inward is the radial dimension of the connecting portion between the permanent magnet insertion portion 1m and the gap portion 1d, and the minimum value of the thickness of the permanent magnet 6 (in consideration of tolerance). By making it smaller, the permanent magnet 6 can be positioned without protruding from the permanent magnet insertion portion 1m into the gap portion 1d.

  As shown in FIG. 6, the permanent magnet insertion portion 1 m into which the permanent magnet 6 of the elongated permanent magnet insertion hole 1 a of the rotor core 2 c is inserted is from the gap portion 1 d at both ends in the circumferential direction where the permanent magnet 6 is not inserted. May be shifted a predetermined length radially outward. Also in this case, the permanent magnet insertion portion 1m into which the permanent magnet 6 is inserted communicates with the gap portion 1d.

  In the above description, the permanent magnet insertion portion 1m of the permanent magnet insertion hole 1a in the electromagnetic steel plate 1 in the entire axial direction of the rotor 2 is shifted in the radial direction with respect to the gap portion 1d. It may be applied to at least two sheets separated by a predetermined distance so that the permanent magnet 6 can be positioned. In this case, the gap 1d does not coincide with the position in the axial direction, but there is no problem. However, the permanent magnet insertion part 1m shifted in the radial direction on one electromagnetic steel sheet 1 is provided with a gap between the permanent magnet 6 and the end plate 3, and the thickness of the electromagnetic steel sheet 1 is 0.2. Impossible because it is as thin as ~ 0.5mm.

  Further, by arranging the permanent magnet insertion portion 1m on the inner side and the outer side of the gap portion 1d in which the permanent magnet 6 is not inserted, the radial width of the gap portion 1d can be increased (see, for example, FIG. 7). ), It is possible to increase the radial width of the gap 1d regardless of the radial width of the permanent magnet 6.

Embodiment 2. FIG.
8 to 11 are diagrams showing the second embodiment. FIG. 8 is a perspective view of a rotor of a permanent magnet embedded motor, FIG. 9 is a cross-sectional view of a rotor without a protrusion, and FIG. FIG. 11 is a cross-sectional view of a rotor having a thin portion instead of a protrusion.

  As shown in FIG. 8, the rotor 2 according to the second embodiment is a combination of a permanent magnet insertion hole 1 a of the electromagnetic steel sheet 1 having a protrusion (described later) and a protrusion having no protrusion. In the example of FIG. 8, several electromagnetic steel sheets 1 at both ends in the axial direction have protrusions, and the electromagnetic steel sheet 1 in the central part in the axial direction has no protrusions.

  The cross section of the rotor 2 at the central portion in the axial direction without projections is as shown in FIG. 9, and the permanent magnet 6 is not positioned in the permanent magnet insertion hole 1a.

  FIG. 10 shows a cross section of a portion formed of the electromagnetic steel plate 1 in which the permanent magnet fixing protrusion 1e is provided in the permanent magnet insertion hole 1a. In FIG. 10, two permanent magnet fixing projections 1e are provided on the long side (the side in the circumferential direction) inside the permanent magnet insertion hole 1a. Then, the gap 1d and the permanent magnet insertion portion 1m are partitioned by the permanent magnet fixing protrusion 1e. The interval between the permanent magnet fixing projections 1e is made substantially the same as the circumferential length of the permanent magnet 6. Two permanent magnet fixing protrusions 1e may be provided on the outer long side of the permanent magnet insertion hole 1a.

  Normally, the permanent magnet fixing protrusion 1e is generally applied to the entire electromagnetic steel plate 1 of the rotor 2, but when the gap 1d is narrow, such as a small motor, the permanent magnet fixing protrusion 1e is Magnetic flux leakage occurs, causing deterioration of characteristics. In order to minimize the magnetic flux leakage, by applying the permanent magnet fixing projections 1e to several laminated magnetic steel sheets 1, the influence of the magnetic flux leakage is reduced and the deterioration of the characteristics can be prevented.

  Further, the minimum number of the electromagnetic steel sheets 1 provided with the permanent magnet fixing protrusions 1e is two (however, the two are separated by a predetermined distance), and by using two, the leakage of magnetic flux is minimized. It becomes.

  Further, the position where the electromagnetic steel sheet 1 having the permanent magnet fixing protrusions 1e is arranged is not limited to both axial ends as shown in FIG. 8, and may be arranged at any position on the rotor 2 with a predetermined interval. .

  FIG. 11 shows a cross-sectional view of the rotor 2 having a thin portion 1f that completely separates the permanent magnet insertion portion 1m and the gap portion 1d into which the permanent magnet 6 is not inserted. When the gap 1d is small as in a small motor, the permanent magnet fixing projection 1e may not be manufactured. In such a case, the electromagnetic steel sheet 1 has a thin portion 1f that completely separates the permanent magnet insertion portion 1m and the gap portion 1d. The circumferential width of the thin portion 1f is preferably about the thickness of the electromagnetic steel sheet 1 (0.2 to 0.5 mm).

  If the electromagnetic steel sheet 1 having the thin portion 1f shown in FIG. 11 is arranged on the entire rotor 2, the leakage of magnetic flux becomes large and the characteristics deteriorate. Therefore, by using the electromagnetic steel plate 1 having the thin portion 1f shown in FIG. 11 for the portion of the electromagnetic steel plate 1 where the protrusion of the rotor 2 shown in FIG. 8 is present, the permanent magnet 6 is positioned by the thin portion 1f. While performing, it is possible to reduce magnetic flux leakage.

  Also in this case, the minimum number of the electromagnetic steel sheets 1 provided with the thin-walled portion 1f is two (however, the two sheets are separated from each other by a predetermined distance). Become.

Embodiment 3 FIG.
12 to 17 show the third embodiment. FIG. 12 is a cross-sectional view of a rotor of an embedded permanent magnet motor before positioning of the permanent magnet. FIG. 13 is an embedded permanent magnet motor before positioning of the permanent magnet. FIG. 14 is a perspective view of a rotor of an embedded permanent magnet motor in which a permanent magnet is positioned by rotating a lower rotor core. FIG. 15 is a perspective view of an upper rotor of an embedded permanent magnet motor. FIG. 16 is a sectional view of the lower rotor, and FIG. 17 is a sectional view taken along the line DD of FIG.

  As shown in FIG. 12, normally, the permanent magnet 6 is made smaller than the permanent magnet insertion portion 1m, and the permanent magnet 6 is dimensioned so that it can be reliably inserted into the permanent magnet insertion portion 1m. However, since the size of the permanent magnet 6 is small, there is a gap between the permanent magnet 6 and the permanent magnet fixing projection 1e, and the permanent magnet 6 moves in the permanent magnet insertion portion 1m during operation, causing noise. .

  Therefore, as shown in FIG. 13, the rotor core 2c is divided into an upper rotor core 2a (an example of a rotor core block) and a lower rotor core 2b (an example of a rotor core block). The upper rotor core 2a and the lower rotor core 2b are fixed in the axial direction by caulking, bonding, welding, or the like. The space between the upper rotor core 2a and the lower rotor core 2b is not fixed. The upper rotor core 2a and the lower rotor core 2b are overlapped with each other, and the permanent magnet 6 is inserted into the permanent magnet insertion portion 1m.

  As shown in FIG. 14, while the upper rotor core 2a is fixed, the lower rotor core 2b is fixed to the permanent magnet 6 with the permanent magnet fixing protrusion 1e of the upper rotor core 2a and the permanent magnet fixed to the lower rotor core 2b. It rotates with respect to the circumferential direction until it completely contacts the projection 1e.

  The cross section of the rotor 2 before the rivet is fixed, in which the permanent magnet 6 is positioned, is as shown in FIGS. As shown in FIG. 15, in the upper rotor core 2a, the permanent magnets 6 are moved counterclockwise and positioned in contact with the permanent magnet fixing projections 1e in the respective permanent magnet insertion portions 1m.

  Further, as shown in FIG. 16, in the lower rotor core 2b, each permanent magnet 6 is moved in the clockwise direction and positioned in contact with the permanent magnet fixing projection 1e in each permanent magnet insertion portion 1m. .

  17 is a cross-sectional view taken along the line DD of FIG. The permanent magnet 6 is pressed by one end of the permanent magnet fixing projection 1e of the upper rotor core 2a, and the other end of the permanent magnet 6 is pressed by the permanent magnet fixing projection 1e of the lower rotor core 2b. 6 is positioned by the permanent magnet fixing projection 1e. Thereby, the noise during driving | operation by the movement in the permanent magnet insertion part 1m of the permanent magnet 6 can be reduced.

  Further, since the lower rotor core 2b is rotated so as to fill the gap between the permanent magnet insertion portion 1m and the permanent magnet 6, the same effect as the step skew (the permanent magnet 6 is inclined with respect to the axis) is obtained. Therefore, the cogging torque can be reduced and the torque ripple can be reduced. It is also possible to intentionally increase the gap between the permanent magnet insertion portion 1m and the permanent magnet 6 and increase the rotation angle of the lower rotor core 2b, thereby further generating the effect of step skew.

  In the above description, the permanent magnet fixing protrusions 1e are formed in the permanent magnet insertion holes 1a of all the electromagnetic steel plates 1 of the upper rotor core 2a and the lower rotor core 2b. The permanent magnet fixing projections 1e may be formed on at least one electromagnetic steel plate 1 of each of 2a and the lower rotor core 2b.

  Further, although the rotor core 2c shown in FIG. 13 is divided into the upper rotor core 2a and the lower rotor core 2b, it may be divided into three or more. When it is divided into three or more, by fixing one or more rotor cores and rotating one or more rotor cores, the permanent magnets 6 are brought into contact with the permanent magnet fixing protrusions 1e, It is possible to position.

  Further, even in a rotor core in which electromagnetic steel sheets are not fixed in the axial direction by caulking, adhesion, welding, or the like, a permanent magnet insertion portion 1m and a permanent magnet are permanently fixed by fixing a part of the upper part and rotating a part of the lower part. The permanent magnet 6 can be positioned by filling one gap with the magnet 6. Further, even if the portion to be fixed is not the upper portion, it may be a part of the rotor, and if the place to be rotated is not the lower portion and other than the fixed portion, the permanent magnet 6 is fixed to the permanent magnet fixing protrusion 1e. It is possible to fix it by making it abut against. At this time, a permanent magnet fixing protrusion 1e is formed on at least one of the electromagnetic steel sheets 1 to be fixed at the upper part, and a permanent magnet fixing protrusion is formed on at least one of the electromagnetic steel sheets 1 to be rotated at the lower part. It is sufficient that 1e is formed.

Embodiment 4 FIG.
18 and 19 show the fourth embodiment. FIG. 18 is a partially enlarged cross-sectional view of a rotor of a permanent magnet embedded motor before permanent magnet fixing. FIG. 19 shows permanent magnet embedded after permanent magnet fixing. It is a partial expanded sectional view of the rotor of a type | mold motor.
Usually, as shown in FIG. 18, the permanent magnet 6 is made smaller than the permanent magnet insertion hole 1a, and the permanent magnet 6 is dimensioned to be surely inserted into the permanent magnet insertion hole 1a. However, since the size of the permanent magnet 6 is small, a gap 1g is generated in the radial direction between the permanent magnet 6 and the permanent magnet insertion hole 1a. Since the gap 1g exists, the permanent magnet 6 is not positioned, and the permanent magnet 6 moves during operation, causing noise.

  Therefore, as shown in FIG. 19, after inserting the permanent magnet 6 into the permanent magnet insertion hole 1a, it is possible to fill the gap 1g by applying an external force in the radial direction from the outside of the rotor 2. Further, since the permanent magnet 6 is pressed by the electromagnetic steel sheet 1, the permanent magnet 6 does not move during operation, so that noise is reduced.

Embodiment 5. FIG.
20 to 23 show the fifth embodiment. FIG. 20 is a partially enlarged sectional view of a rotor of an embedded permanent magnet motor in which no permanent magnet is inserted. FIG. 21 is a sectional view of a permanent magnet. 22 is a partial enlarged cross-sectional view of a rotor of a permanent magnet embedded motor in which a protrusion is present in the permanent magnet insertion hole 1a and no permanent magnet is inserted, and FIG. 23 is another protrusion in the permanent magnet insertion hole 1a. It is a partial expanded sectional view of the rotor of the permanent magnet embedded type motor which exists and the permanent magnet is not inserted.

  The permanent magnet 6 is usually coated to improve water resistance and moisture resistance. The thickness of the permanent magnet 6 can be divided into a thickness tp of the permanent magnet material 6a and a thickness tc of the coating 6b, and the thickness of the permanent magnet 6 is tp + 2tc (see FIG. 21). By setting tp <A <tp + 2tc with respect to the width (in the radial direction of the rotor) A of the permanent magnet insertion hole 1a shown in FIG. 20, the permanent magnet 6 is press-fitted and inserted into the permanent magnet insertion hole 1a. . Further, since A> tp, the permanent magnet material 6a is not scraped even if it is press-fitted, and only the coating 6b is scratched and can be press-fitted. By press-fitting the permanent magnet 6, the permanent magnet 6 can be positioned and held, and the permanent magnet 6 can be positioned without requiring a special positioning device.

  Moreover, as shown in FIG. 22, you may provide the uneven | corrugated shaped protrusion part 1h facing a part of two sides of the longitudinal direction of each permanent magnet insertion hole 1a. By setting the distance B between the protrusions 1h at this time to be tp <B <tp + 2tc, the permanent magnet 6 is press-fitted by the protrusion 1h, and the distance B between the protrusions 1h is larger than tp. The permanent magnet 6 can be positioned without the permanent magnet material 6a being scraped. When the permanent magnet 6 is press-fitted into the permanent magnet insertion hole 1a, the permanent magnet 6 is only in contact with part of the two sides in the longitudinal direction of the permanent magnet insertion hole 1a.

  FIG. 23 shows another form of protrusion 1k. The planar protrusion 1k is provided so as to face a part of two sides in the longitudinal direction of the permanent magnet insertion hole 1a. By making the protruding portion 1k flat, the area to be press-fitted is increased, so that the permanent magnet 6 can be held more firmly.

Embodiment 6 FIG.
24 to 28 are diagrams showing the sixth embodiment. FIG. 24 is a sectional view of a rotor of a permanent magnet embedded motor, FIG. 25 is a plan view of an end plate 3, and FIG. 26 is a permanent magnet embedded motor. 27 is a sectional view of a rotor of a permanent magnet embedded motor according to a modification, and FIG. 28 is a sectional view of a rotor of a permanent magnet embedded motor according to another modification.

  In the first to fifth embodiments, the rotor 2 includes the laminated electromagnetic steel sheets 1, the permanent magnet insertion hole 1a for inserting the permanent magnet 6, and the permanent magnet insertion hole 1a or the permanent magnet insertion portion 1m. A permanent magnet 6 inserted into the rotor, a gap 1d for preventing leakage of magnetic flux, an end plate 3 mounted on the end face in the axial direction of the rotor 2, and a non-magnetic rivet for fixing the end plate 3 4. Usually, the rivet insertion hole 1b through which the rivet 4 passes is not obstructed by the magnetic flux at the center of the rotor 2 or the like, and is not provided at the same position as the gap 1d and the permanent magnet insertion hole 1a.

  In the present embodiment, as shown in FIG. 24, a rivet fixing hole 3b is provided in the end plate 3 so that the non-magnetic rivet 4 passes through the gap 1d (see FIG. 25) and inserted. By making the distance between the rivets 4 substantially the same as the width of the permanent magnet 6, the permanent magnet 6 can be fixed by the end plate fixing rivets 4 without providing the permanent magnet fixing projections 1e and the thin portion 1f. it can. As shown in FIG. 25, the end plate 3 is provided with a rivet fixing hole 3b so that the rivet 4 can pass through the gap 1d and the permanent magnet 6 can be positioned by the two rivets 4. The hole 3a is also provided near the center. The external appearance of the rotor 2 having such a configuration is as shown in FIG.

  27, when the diameter of the rivet 4 is larger than the radial width of the gap 1d, the rivet 4 is inserted into the gap 1d by matching the shape of the gap 1d with the shape of the rivet 4. It is possible to position the permanent magnet 6.

  When the rivet 4 is a magnetic material, if the rivet 4 is present in the gap 1d, the magnetic flux passes through the rivet 4 and leakage of the magnetic flux occurs. Therefore, when the rivet 4 for fixing the end plate 3 is a magnetic body, as shown in FIG. 28, the rivet 4 is embedded on the inner side (center side of the rotor 2) with respect to the gap 1d, and a part of the rivet 4 is a gap. By projecting into the portion 1d, leakage of magnetic flux can be minimized, and the permanent magnet 6 can be fixed by the rivet 4. Further, even if the magnetic rivet 4 is embedded on the outer side (outer peripheral side of the rotor 2) and a part of the rivet 4 protrudes into the gap 1d, the same effect as that embedded in the inner side can be obtained. it can. Further, the rivet 4 may be made of a non-magnetic material, and the leakage of magnetic flux is reduced compared to when the rivet 4 is a magnetic material, and the permanent magnet 6 can be fixed by the rivet 4.

Embodiment 7 FIG.
29 to 32 are diagrams showing Embodiment 7, FIG. 29 is a perspective view of a rotor of an embedded permanent magnet motor, FIG. 30 is a cross-sectional view of the rotor of an embedded permanent magnet motor, FIG. 32 is a cross-sectional view taken along the line AA of FIG.
As shown in FIGS. 29 and 30, the rotor 2 includes a laminated electromagnetic steel sheet 1, a permanent magnet insertion hole 1 a for inserting the permanent magnet 6, and a permanent magnet 6 inserted into the permanent magnet insertion hole 1 a. A gap 1d for preventing leakage of magnetic flux, an end plate 30 mounted on the axial end surface of the rotor core 2c, and a magnetic or non-magnetic rivet 4 for fixing the end plate 30. Prepare.

  As shown in FIG. 31, a permanent magnet fixing cut-and-raised portion 30c (an example of a permanent magnet fixing protrusion) is provided on a surface of the end plate 30 to be combined with the electromagnetic steel plate 1, and the permanent magnet fixing cut-and-raised portion is provided. The part 30c is configured to fit in the gap 1d that prevents leakage of magnetic flux. The permanent magnet fixing cut-and-raised portion 30c of the end plate 30 is structured so as to press both ends in the circumferential direction of the permanent magnet 6 in a state where the rotor core 2c is fixed by the rivet 4. With such a structure, it is possible to fix the permanent magnet 6 with the rivet 4 at the same time as fixing the end plate 30.

  Since the permanent magnet 6 is positioned by fitting the cut-and-raised part 30c for fixing the permanent magnet of the end plate 30 into the gap 1d, the shape of the electromagnetic steel sheet 1 of the rotor core 2c remains the same as before and the mold is used. The permanent magnet 6 can be positioned without change. Further, the permanent magnet 6 can be held also by providing the permanent magnet fixing cut-and-raised portion 30 c of the end plate 30 only on one of the end plates 30 on both end faces of the rotor 2.

  As shown in FIG. 32, instead of the permanent magnet fixing cut-and-raised portion 30c, a permanent magnet fixing convex portion 30d (an example of a permanent magnet fixing protrusion) formed by press molding may be used. Thereby, there exists the same effect.

It is a figure which shows the rotor of a common permanent magnet embedded motor, and is a top view of an electromagnetic steel plate. It is a figure which shows the rotor of a general permanent magnet embedded type motor, and is a perspective view of a rotor. It is a figure which shows the rotor of a general permanent magnet embedded type motor, and is sectional drawing of a rotor. FIG. 3 is a diagram showing the first embodiment and is a plan view of the electromagnetic steel sheet 1. FIG. 5 shows the first embodiment, and is a cross-sectional view of a rotor of a permanent magnet embedded motor. It is a figure which shows Embodiment 1 and is sectional drawing of the rotor of another permanent magnet embedded type motor. FIG. 5 is a diagram showing the first embodiment and is a partial enlarged cross-sectional view of a rotor of a permanent magnet embedded motor. It is a figure which shows Embodiment 2, and is a perspective view of the rotor of a permanent magnet embedded type motor. It is a figure which shows Embodiment 2, and is sectional drawing of the rotor of a part without a processus | protrusion. It is a figure which shows Embodiment 2, and is sectional drawing of the rotor of a part with a processus | protrusion. FIG. 10 is a diagram illustrating the second embodiment, and is a cross-sectional view of a rotor having a thin portion instead of a protrusion. FIG. 6 is a diagram showing a third embodiment, and is a cross-sectional view of a rotor of an embedded permanent magnet motor before positioning of the permanent magnet. It is a figure which shows Embodiment 3, and is a perspective view of the rotor of the permanent magnet embedded motor before permanent magnet positioning. FIG. 10 is a diagram showing a third embodiment, and is a perspective view of a rotor of an embedded permanent magnet motor in which a lower rotor is rotated to position a permanent magnet. It is a figure which shows Embodiment 3, and is sectional drawing of the upper rotor of a permanent magnet embedded type motor. It is a figure which shows Embodiment 3, and is sectional drawing of a lower rotor. It is a figure which shows Embodiment 3, and is DD sectional drawing of FIG. It is a figure which shows Embodiment 4, and is the elements on larger scale of the rotor of the permanent magnet embedded type motor before permanent magnet fixation. It is a figure which shows Embodiment 4, and is a partial expanded sectional view of the rotor of the permanent magnet embedded type motor after permanent magnet fixation. It is a figure which shows Embodiment 5, and is the elements on larger scale of the rotor of the permanent magnet embedded type motor in which the permanent magnet is not inserted. It is a figure which shows Embodiment 5, and is sectional drawing of a permanent magnet. FIG. 10 is a diagram showing the fifth embodiment, and is a partial enlarged cross-sectional view of a rotor of a permanent magnet embedded motor in which a protrusion is present in a permanent magnet insertion hole 1a and no permanent magnet is inserted. It is a figure which shows Embodiment 5, and is a partial expanded sectional view of the rotor of the permanent magnet embedded motor in which another protrusion exists in the permanent magnet insertion hole 1a, and the permanent magnet is not inserted. It is a figure which shows Embodiment 6, and is sectional drawing of the rotor of a permanent magnet embedded type motor. FIG. 10 shows the sixth embodiment and is a plan view of the end plate 3. It is a figure which shows Embodiment 6, and is a perspective view of the rotor of a permanent magnet embedded type motor. It is a figure which shows Embodiment 6, and is sectional drawing of the rotor of the permanent magnet embedded type motor of a modification. It is a figure which shows Embodiment 6, and is sectional drawing of the rotor of the permanent magnet embedded type motor of another modification. It is a figure which shows Embodiment 7, and is a perspective view of the rotor of a permanent magnet embedded type motor. It is a figure which shows Embodiment 7, and is sectional drawing of the rotor of a permanent magnet embedded type motor. It is a figure which shows Embodiment 7, and is AA sectional drawing of FIG. It is a figure which shows Embodiment 7, and is AA sectional drawing of FIG.

Explanation of symbols

  1 magnetic steel sheet, 1a permanent magnet insertion hole, 1b rivet insertion hole, 1c shaft insertion hole, 1d gap, 1e permanent magnet fixing projection, 1f thin wall, 1g clearance, 1h projection, 1k projection, 1m permanent magnet insertion Part, 2 rotor, 2a upper rotor core, 2b lower rotor core, 2c rotor core, 3 end plate, 3a shaft insertion hole, 3b rivet fixing hole, 4 rivet, 5 shaft, 6 permanent magnet, 6a permanent Magnet material, 6b coating, 30 end plate, 30c cut-and-raised part for fixing permanent magnet, 30d convex part for fixing permanent magnet.

Claims (3)

A rotor core on which a plurality of electromagnetic steel sheets are laminated;
A permanent magnet insertion hole that is provided in the rotor core so as to penetrate in the axial direction and is long in the circumferential direction,
A permanent magnet press-fitted near the center of the permanent magnet insertion hole and coated on the surface of the permanent magnet material;
A gap formed at both circumferential ends in the permanent magnet insertion hole;
A non-magnetic end plate provided at both ends of the rotor core and used to prevent the permanent magnet from coming off;
The permanent magnet insertion hole is formed with a protruding portion facing a part of two sides in the longitudinal direction, the thickness of the permanent magnet material in the radial direction is tp, the thickness of the coating is tc, and between the protruding portions When the distance is B, the relationship of tp <B <tp + 2tc is satisfied, and the permanent magnet is press-fitted into the permanent magnet insertion hole while the coating of the permanent magnet is in contact with the protrusion. Rotor of magnet-embedded motor. Interior permanent magnet motor rotor according to claim 1, characterized by being configured the projecting portions in uneven shape. Claim 1 interior permanent magnet motor rotor, wherein the said projecting portion is constituted by a plane contact surface between the permanent magnet.

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