JP2005057865A - Structure of rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a rotor which can prevent magnetic flux from short circuiting between magnets constituted by skewing and which can improve the performance of a rotary electric machine. <P>SOLUTION: The structure of the rotor 11 includes a plurality of magnets 5 penetrating in the laminating direction of laminated cores 2, 3 obtained by laminating boards of magnetic substances in such a manner that positions of the magnets are skewed at centers of the laminated cores and a nonmagnetic substance layer 4 is formed on the skewed part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is a structure in which a plurality of magnets are provided so as to penetrate in the laminating direction of a laminated core formed by laminating magnetic plates, which is used in, for example, a rotating electric machine for driving. The present invention relates to a rotor having a structure in which magnet positions are skewed.

  2. Description of the Related Art Conventionally, as an example of an AC servo motor used for driving industrial equipment or the like, it has a structure in which a rotating shaft is provided and the magnetic poles of a plurality of ring-type polar anisotropic magnets are shifted (skewed) by a predetermined amount. A motor including a rotor and a stator fixed around the rotor is known (for example, Patent Document 1). In this example, an AC servo motor with reduced cogging torque is obtained by a rotor having a structure in which the magnetic poles of a plurality of ring-type polar anisotropic magnets are shifted by a predetermined amount.

Further, instead of the rotor made of the ring-type polar anisotropic magnet, as shown in FIG. 5, an example is shown in which a laminated core 51 (in the figure, laminated for convenience) In this structure, a plurality of magnets 52 are provided so as to penetrate in the laminating direction of the laminated body 51, and the axial position of the magnet 52 is skewed at an angle θ. A rotating electrical machine using a rotor having a structure skewed by an angle is also known.
JP-A-8-340652

  In the rotating electrical machine having the structure shown in FIG. 5, the magnetic flux φp perpendicular to the axis inherently rotates the rotating electrical machine. However, as shown in FIG. 6, by skewing one magnet 52 and the other magnet 52, the S pole of one magnet 52 and the N pole of the other magnet 52 become closer to each other in the axial direction (on the paper surface). There is a problem that the magnetic flux φv flows in the vertical direction) and that amount is subtracted from the rotational magnetic flux φp. As a result, the output of the rotating electrical machine was reduced, leading to performance degradation.

  An object of the present invention is to solve the above-described problems, to prevent a short circuit of magnetic flux between magnets configured by skewing, and to provide a rotor structure capable of improving the performance of a rotating electrical machine. To do.

  The structure of the rotor of the present invention is a structure in which a plurality of magnets are provided in the lamination direction of a laminated core formed by laminating magnetic plates, and the magnet position is skewed at the center of the laminated core. In the rotor having the structure, a non-magnetic layer is formed in the skew portion.

  In the structure of the rotor of the present invention, in the structure in which the laminated core of the rotor and the magnet are skewed at the central portion in the axial direction so as to reduce the cogging torque of the rotor, the circumferential phase is shifted due to the skew. There was a problem that magnetic flux short-circuited between magnets, but by forming a non-magnetic layer in the skew part, magnetic flux short-circuiting can be prevented and the performance of the rotating electrical machine can be improved. it can.

  In the rotor structure of the present invention, the non-magnetic layer may be an air layer. If comprised in this way, the layer of a nonmagnetic material can be comprised easily.

  In the rotor structure of the present invention, the non-magnetic layer may be a layer made of a stainless steel plate. If configured in this way, the stainless steel plate has almost the same strength and thermal expansion coefficient as the electromagnetic steel plate constituting the laminated core. No problems occur due to differences in materials.

  Further, in the rotor structure of the present invention, the notch is formed on both surfaces of the stainless steel plate, and the notch is engaged with the notch positioning holes of the laminated core contacting the both surfaces of the stainless steel plate, so that the nonmagnetic layer is formed. A skew angle between the sandwiched magnets may be defined. With this configuration, the stainless steel plate sandwiched between the skew portions of the rotor is provided with notches on both sides by press molding or the like, and if there is an air gap portion between the permanent magnet of the laminated core and the laminated steel plate, By using the air gap portion as a notch positioning hole and abutting the notch, the skew angle of the laminated core can be easily determined.

  FIGS. 1A and 1B are views for explaining an example of the structure of the rotor according to the present invention, respectively. FIG. 1A is an axial sectional view (for easy viewing of the drawings, all An example is shown in which the cross section of the member is not hatched, and FIG. 1B shows an example of a non-magnetic layer. In the example shown in FIGS. 1A and 1B, the rotor 11 includes a laminated core 2 formed by laminating electromagnetic steel sheets on the output shaft 1, and a laminated core formed by laminating electromagnetic steel sheets. 3 and a non-magnetic stainless steel plate 4 provided in the central portion of the laminated core between the two laminated cores 2 and 3 are shrink-fitted and configured in the lamination direction of the laminated cores 2 and 3. A plurality of permanent magnets 5 are fixed in the provided hole. Here, as shown in FIG.1 (b), the stainless steel plate 4 has the disk shape which has the hole part which the rotating shaft 1 penetrates in the center.

  Further, in the rotor 11 of the present invention, the laminated core 2 and the laminated core 3 are formed to be skewed at a circumferential angle position. That is, as shown in FIGS. 2 (a) and 2 (b), for example, the permanent magnet 5 fixed to the rotor 11 is divided in the axial direction corresponding to the laminated core 2 and the laminated core 3, and the circumferential direction. By providing a skew such that the skew angle, which is the deviation angle, is θ, the cogging torque between the stator and the rotor (not shown) is reduced. Further, in this example, when the permanent magnet 5 is fixed to the holes formed in the laminated core 2 and the laminated core 3, the shape of the hole and the shape of the permanent magnet 5 are not matched, and the air gap 6 is formed. . Thus, a stainless steel plate as a non-magnetic layer between the laminated core 2 and the laminated core 3 having a skew, in other words, in the central portion of the entire laminated core composed of the laminated core 2 and the laminated core 3. 4 is a feature of the present invention.

  In the structure of the rotor of the present invention, as described above, a plurality of magnets 5 are provided in the stacking direction of the stacked cores 2 and 3 formed by stacking magnetic plates, and the center of the stacked cores 2 and 3 is provided. This is characterized in that the magnet position is skewed at the portion, and a nonmagnetic layer (stainless steel plate 4 here) is formed at the skewed portion. In a rotor having such a structure, a short circuit of magnetic flux can be prevented by forming a non-magnetic layer in the skew portion, and the amount of magnetic flux used for rotation increases, so that the rotating electrical machine Performance can be improved.

  In the example described above, the stainless steel plate 4 is used as the non-magnetic layer, but the non-magnetic layer can be formed from other materials. As an example, even if the space between the laminated cores 2 and 3 is a space, and the nonmagnetic material layer is formed from the air layer, the same effect as that of the rotor structure described above can be obtained.

  Next, another embodiment will be described. FIG. 3 is a view for explaining another example of the structure of the rotor of the present invention. FIGS. 4 (a) and 4 (b) show other configurations of the stainless steel plate used in the rotor shown in FIG. It is a figure for demonstrating. In this example, an example in which a positioning mechanism for the skew angle θ of the laminated cores 2 and 3 is added to the stainless steel plate 4 as a non-magnetic layer is shown. That is, the stainless steel plate 4 which is a non-magnetic material installed between the laminated core 2 and the laminated core 3 is provided with notches 4a and 4b which are formed on both surfaces by press molding or the like and facing in opposite directions. The notches 4a and 4b are inserted into air gaps 6 formed in the gaps between the laminated core 2 and the permanent magnet 5 in the holes of the laminated core 3, respectively. By positioning the laminated core 2 and the laminated core 3 in the circumferential direction against the notches 4a and 4b, the skew angle θ between the laminated cores 2 and 3 can be positioned.

  In this example, a positioning mechanism for the skew angle θ between the laminated cores 2 and 3 is added to the stainless steel plate 4 provided to prevent a short circuit of the magnetic flux, thereby easily positioning the skew angle of the laminated core. Can do. In the above-described example, the air gap 6 of the laminated cores 2 and 3 is used as the notch positioning hole in order to engage the notches 4a and 4b. You may not want to use it. In such a case, a separate notch positioning hole can be provided in the adjacent laminated cores 2 and 3 where the air gap 6 is present, and the notches 4a and 4b can be engaged with the notch positioning holes.

  In order to reduce cogging torque, a structure in which a plurality of magnets are provided in the lamination direction of a laminated core formed by laminating magnetic plates, and the magnet position is skewed at the center of the laminated core. The rotor can be applied as a rotor for various motors used for driving industrial equipment or the like by forming a non-magnetic layer in the skew portion to prevent a magnet from being short-circuited at the skew portion.

(A), (b) is a figure for demonstrating an example of the structure of the rotor which concerns on this invention, respectively. (A), (b) is a figure for demonstrating an example of the laminated core each arrange | positioned skewing. It is a figure for demonstrating the other example of the structure of the rotor of this invention. (A), (b) is a figure for demonstrating the other structure of the stainless steel plate utilized with the rotor shown in FIG. 3, respectively. It is a figure for demonstrating an example of the rotor utilized for the conventional motor. It is a figure for demonstrating the problem in the rotor utilized for the conventional motor shown in FIG.

Explanation of symbols

1 output shaft,
2, 3 Laminated core 4 Stainless steel plate 4a, 4b Notch 5 Permanent magnet 11 Rotor

Claims (4)

  In a rotor having a structure in which a plurality of magnets are provided in the stacking direction of a stacked core formed by stacking magnetic plates, and the magnet position is skewed at the center of the stacked core, A rotor structure characterized by forming a non-magnetic layer.   The rotor structure according to claim 1, wherein the non-magnetic layer is an air layer.   The rotor structure according to claim 1, wherein the nonmagnetic layer is a layer made of a stainless steel plate.   The skew angle between the two magnets sandwiching the non-magnetic layer is defined by raising notches on both surfaces of the stainless steel plate and engaging the notches with the notch positioning holes of the laminated core in contact with both surfaces of the stainless steel plate. 3. The structure of the rotor according to 3.

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