JP3347945B2 - Permanent magnet rotor, method for adjusting magnetic properties thereof and apparatus for adjusting magnetic properties - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet rotor having a plurality of magnetic poles formed of permanent magnets on its outer peripheral surface and functioning as a rotor of a rotating electric machine, and a method for adjusting the magnetic characteristics of the permanent magnet rotor. And a magnetic characteristic adjusting device.

[0002]

2. Description of the Related Art A conventional permanent magnet rotor having a plurality of magnetic poles formed of arc-shaped permanent magnets mounted on its outer surface is disclosed, for example, in Japanese Patent Application Laid-Open No. Sho 62-166775, and Japanese Utility Model Application Laid-Open No. Sho.
As disclosed in Japanese Patent Application Laid-Open No. 1-68868, the corners of the four corners of the magnetic pole are cut off, or the width of the magnetic pole in the circumferential direction is reduced in the axial direction from the center to both ends. JP-A-62-1114454, JP-A-2-14
As shown in Japanese Patent No. 2333, air gap magnetic flux density waveforms are obtained by chamfering the circumferential end faces of the magnetic poles and tapering the radial thickness of the magnetic poles from the center toward both ends. Is adjusted to a target sine wave shape. Further, as shown in, for example, JP-A-60-226749 and JP-A-3-222641, the both ends of a magnetic pole are cut obliquely to form a parallelogram. Alternatively, it has been proposed that a skew effect be provided by forming a trapezoidal shape.

On the other hand, as a permanent magnet rotor having a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction and mounted on an outer surface, for example, Japanese Patent Application Laid-Open No. Hei 5-
As shown in Japanese Patent No. 175039, a notch whose area is gradually reduced in the circumferential direction is provided in the adjacent portion of each magnetic pole, for example, in Japanese Patent Application Laid-Open Nos. 59-144348 and 59-144352. As shown in FIG. 5, the length of each magnetic pole in the axial direction is made to be a gentle mountain shape in the circumferential direction.
As shown in Japanese Unexamined Patent Application Publication No. 59-144349, by forming the thickness of each magnet in the radial direction to be a gentle mountain shape in the circumferential direction, the air gap magnetic flux density waveform is changed to a target sinusoidal waveform. And Japanese Patent Laid-Open No. 57-27872, and Japanese Patent Laid-Open No. 4-255.
As disclosed in Japanese Patent Publication No. 440, it has been proposed to impart a skew effect by forming the division pattern of the magnetic poles into a twisted or lightning shape.

[0004]

The conventional permanent magnet rotor is constructed as described above. In order to adjust the air gap magnetic flux density waveform to a target sine wave shape or to give a skew effect, various types of magnetic poles are provided. Demagnetization adjustment is performed by processing, but permanent magnets that form magnetic poles generally have low mechanical strength and are easily chipped, which limits the processed shape, making demagnetization adjustment difficult and obtaining desired characteristics. There was a problem that can not be.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a permanent magnet rotor capable of easily performing demagnetization adjustment of a magnetic pole and obtaining desired characteristics, and its magnetic field. It is an object to provide a characteristic adjustment method and a magnetic characteristic adjustment device.

[0006]

According to a first aspect of the present invention, there is provided a permanent magnet rotor having a plurality of magnetic poles formed of permanent magnets mounted on an outer surface thereof. By irradiating a predetermined area of the surface with a laser or an electron beam to perform local heating, the irradiated area is demagnetized to make the air gap magnetic flux density waveform close to a sine wave .

Further, the permanent magnet rotor according to claim 2 of the present invention is characterized in that, in claim 1, the irradiation is performed so that both ends of the magnetic pole in the circumferential direction are minimum at the axial center and maximum at the axial ends. The width of each area is set.

According to a third aspect of the present invention, there is provided a permanent magnet rotor according to the first aspect, wherein irradiation regions are respectively set at both ends in the circumferential direction and both ends in the axial direction of the magnetic pole.

According to a fourth aspect of the present invention, in the permanent magnet rotor according to the first aspect of the present invention, the irradiation is performed over the entire axial direction of the magnetic pole so as to be minimum at the center in the circumferential direction and maximum at both ends in the circumferential direction. The depth of each area is set.

According to a fifth aspect of the present invention, there is provided a permanent magnet rotor according to the first aspect, wherein irradiation regions are respectively set over the entire area of the magnetic pole in the axial direction and at both ends in the circumferential direction.

According to a sixth aspect of the present invention, in the permanent magnet rotor according to the first aspect, one end in the circumferential direction extends sequentially from one end in the axial direction to the other end in the entire axial direction of the magnetic pole. As described above, the width of the irradiation area is set so that the other end in the circumferential direction is sequentially reduced from one end in the axial direction to the other end.

According to a seventh aspect of the present invention, in the permanent magnet rotator according to the first aspect, the permanent magnet rotor is sequentially expanded from one end in the axial direction to the other end in the axial direction at both ends in the circumferential direction over the entire area in the axial direction of the magnetic pole. The first magnetic pole having the width of the irradiation region set as described above, and the second having the width of the irradiation region set so as to gradually decrease from one end in the axial direction to the other end in the entire axial direction and at both ends in the circumferential direction. And the magnetic poles are alternately arranged.

Further, according to a method of adjusting magnetic properties of a permanent magnet rotor according to claim 8 of the present invention, a permanent magnet rotor constituted by mounting a plurality of magnetic poles formed of a permanent magnet on an outer surface is mounted on a predetermined surface. Rotating at a rotational speed, measuring the magnetic or electrical properties of the permanent magnet rotor, irradiating the surface of the magnetic pole with a laser or electron beam, and setting the measured magnetic or electrical properties in advance. And setting a laser or electron beam irradiation area based on the comparison result.

According to a ninth aspect of the present invention, there is provided an apparatus for adjusting magnetic properties of a permanent magnet rotor, comprising: a magnetic pole between a magnetic pole of a permanent magnet rotor and a magnetic pole of a stator disposed opposite to the magnetic pole; The magnetic flux density generated in the air gap, the waveform of the voltage induced between the lines on the stator side, measuring means for measuring at least one of cogging torque, and a laser or a laser on the surface of the magnetic pole of the permanent magnet rotor A local heating means for irradiating an electron beam to locally heat an irradiation area; a measurement value measured by the measurement means is compared with a preset target reference value; and an irradiation area is set based on the comparison result to set a local heating area. Calculation control means for controlling the means.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIGS. 1 and 3 show different configurations of a permanent magnet rotor according to a first embodiment of the present invention in which a plurality of magnetic poles formed by arc-shaped permanent magnets are mounted on the outer surface of a yoke of a rotor shaft. FIGS. 2 and 4 show a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction on an outer surface of a yoke of a rotor shaft according to the first embodiment of the present invention. It is a perspective view which shows each different structure of the completed permanent magnet rotor.

FIG. 5 is a schematic diagram showing an enlarged cross section of a magnetic pole for explaining the gist of the present invention, and FIG. 6 performs demagnetization adjustment of the magnetic pole of the permanent magnet rotor shown in FIGS. FIG. 7 is a block diagram showing a schematic configuration of a magnetic characteristic adjusting device, and FIG.
FIG. 8 is a waveform diagram showing a waveform of an air gap magnetic flux density obtained by a Gauss meter of the magnetic property adjusting device in FIG. 8, and FIG. 8 shows a waveform of an induced voltage between the lines on the stator side obtained by the Fourier transformer of the magnetic property adjusting device in FIG. FIG. 9 is a waveform diagram showing a waveform of the cogging torque obtained by the torque detector of the magnetic characteristic adjusting device in FIG.

In the figure, 1 is a rotor shaft, 2 is a yoke fitted to the outer peripheral portion of the rotor shaft 1, 3 is an arc-shaped anisotropic permanent magnet, and a circle on the outer surface of the yoke 2 The plurality of magnetic poles 4, which are mounted at predetermined intervals in the circumferential direction, are formed by magnetically partitioning a cylindrical anisotropic permanent magnet fitted on the outer peripheral portion of the yoke 2 in the circumferential direction. The plurality of magnetic poles 5 are irradiation areas that are locally heated to a Curie point or higher by irradiating the surface of each of the magnetic poles 3 and 4 with a laser or an electron beam.
Is configured.

Reference numeral 7 denotes a stator which constitutes a rotating electric machine together with the permanent magnet rotor 6, and has a plurality of salient poles 7a provided with windings (not shown) on the inner peripheral side facing the permanent magnet rotor 6. are doing. Reference numeral 8 denotes a driving motor connected to the permanent magnet rotor 6 for rotationally driving the same. Reference numeral 9 denotes a torque detector which is disposed at a connection between the permanent magnet rotor 6 and the driving motor 8 and measures cogging torque. A rotation detector for detecting the number of rotations of the permanent magnet rotor 6, a Hall element 11 arranged on the salient pole 7a of the stator 7, and a Gauss meter 12 for measuring the air gap magnetic flux density in cooperation with the Hall element 11. is there.

Reference numeral 13 denotes a Fourier transformer for measuring the line voltage of the stator 7, and these 9 to 12 constitute measuring means. Reference numeral 14 denotes a laser oscillator serving as local heating means for locally heating the irradiation area 5 by irradiating a laser to a predetermined position on the surface of each of the magnetic poles 3 and 4 of the permanent magnet rotor 6 via an irradiation nozzle 15, and 16 denotes a torque Each data such as the cogging torque, the air gap magnetic flux density, and the line induced voltage of the stator 7 obtained by the detector 9, the Gauss meter 12, and the Fourier transformer 13 is compared with each predetermined target reference value. This is an arithmetic control unit that sets the laser irradiation area 5 based on the result and controls the laser oscillator 14.

FIG. 5 is a cross-sectional view schematically showing a cross section in the vicinity of each irradiation area 5 set by the arithmetic and control means 16 of the magnetic characteristic adjusting device constructed as described above. Each of the magnetic poles 3 and 4 has an axis of easy magnetization in the vertical direction, but the locally heated irradiation region 5 has a reduced amount of magnetic flux, that is, a demagnetized state, as compared with other portions. As described above, the present invention irradiates a predetermined position of each magnetic pole with a laser or an electron beam and locally heats the magnetic pole, thereby utilizing the fact that the irradiated area is in a demagnetized state. The demagnetization adjustment is performed.

Next, a method of adjusting the magnetic characteristics of the permanent magnet rotor by the magnetic characteristic adjusting device shown in FIG. 6 will be described. First, after the permanent magnet rotor 6 is mounted in the stator 7, the drive motor 8 is driven to rotate the permanent magnet rotor 6 at a predetermined rotation speed. The rotation speed is always detected by the rotation detector 10. Next, in this state, the cogging torque is detected by the torque detector 9, the air gap magnetic flux density is detected by the Hall element 11 and the Gauss meter 12, and the line induced voltage on the stator 7 side is detected by the Fourier transformer 13, respectively.

Here, the cogging torque, the air gap magnetic flux density and the line induced voltage detected as described above will be considered. First, although the cogging torque generated by the relationship of the magnetic inhomogeneity of the groove and the armature core winding, as shown by torque T ₁ in FIG. 9, is detected sizable cogging torque in the state of unadjusted . In addition, when the accuracy of the shape and dimensions of the magnetic pole 3 or the assembling dimension to the yoke 2 is poor, for example, the gap magnetic flux density varies as shown by a broken line in the waveform of the gap magnetic flux density shown in FIG. In addition, the line induced voltage is required to be a sine-wave-shaped waveform when the rotating electric machine is required to have smooth rotation, small torque ripple, and small rotation unevenness. As shown by a broken line in FIG. 8, a sinusoidal waveform is not obtained.

Finally, the arithmetic and control means 16 compares each waveform thus obtained with a preset target reference value, that is, a waveform shown by a solid line in each of FIGS. A predetermined portion of the surface of the magnetic pole 3 which needs to be demagnetized in order to match the portion shown by the solid line with the waveform shown by the solid line, that is, a laser irradiation area 5 is set and a control command is sent to the laser oscillator 14, The laser oscillator 14 irradiates a laser to the irradiation area 5 on the surface of the magnetic pole 3 through the irradiation nozzle 15 based on this control command, and performs local heating at a temperature equal to or higher than the Curie point. At this time, one of the permanent magnet rotor 6 and the stator 7 is moved in the axial direction so that the work is easy, and the magnetic pole 3 is exposed.

As described above, according to the first embodiment, the magnetic poles 3, 4,
By irradiating a laser to the irradiation area 5 on the surface of the surface of the substrate and performing local heating, the irradiation area 5 is demagnetized, that is, demagnetized, so that various processes are performed on the magnetic pole as described in the related art. It is possible to provide a permanent magnet rotor capable of easily performing demagnetization adjustment and obtaining desired magnetic characteristics without necessity, and a method and an apparatus for adjusting the magnetic characteristics thereof.

Embodiment 2 10 and 11 show different configurations of a permanent magnet rotor in which a plurality of magnetic poles formed by arc-shaped permanent magnets are mounted on the outer surface of a yoke of a rotor shaft according to a second embodiment of the present invention. FIG. 12 to FIG. 15 show a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction on an outer surface of a yoke of a rotor shaft according to a second embodiment of the present invention. It is a perspective view which shows each different structure of the completed permanent magnet rotor.

In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description is omitted. 1
Reference numeral 7 denotes a plurality of magnetic poles mounted on the outer surface of the yoke 2 at predetermined intervals in a circumferential direction as shown in FIG. 10, and eight magnetic poles are formed by arc-shaped anisotropic permanent magnets. Are located. Reference numeral 18 denotes an irradiation area formed by irradiating laser to both ends in the circumferential direction of each of the magnetic poles 17 and performing local heating above the Curie point. The irradiation area 18 is minimum at the axial center and maximum at the axial ends. The width is set as follows.
Although the case where the width of the irradiation area 18 in FIG. 10 is changed linearly is shown, it goes without saying that the width of the irradiation area 19 may be changed in a curved manner as shown in FIG.

Numeral 20 denotes four magnetic poles formed by magnetically partitioning a cylindrical anisotropic permanent magnet fitted on the outer surface of the yoke 2 in the circumferential direction as shown in FIG. A laser is applied to the boundary of each of the magnetic poles 20 along the axial direction, and an irradiation region formed by performing local heating above the Curie point, the minimum at the axial center, and the maximum at both axial ends. The width is set so that Reference numeral 22 denotes an irradiation area formed in the same manner as the irradiation area 21 as shown in FIG. 13, and the minimum width of the irradiation area 21 has a certain size, but the minimum width of the irradiation area 22 is It is formed to be almost zero. FIG. 12 and FIG.
Shows the case where the width of each of the irradiation regions 21 and 22 is changed linearly, but the width of each of the irradiation regions 23 and 24 may be changed in a curved shape as shown in FIGS. Needless to say.

As described above, according to the second embodiment, each irradiation having a width at both ends in the circumferential direction of each of the magnetic poles 17 and 20 is minimum at the center in the axial direction and maximum at both ends in the axial direction. By setting the regions 18, 19, 21, 22, 23, and 24 and irradiating the portions with laser to perform local heating, the respective irradiated regions 18, 19, 21, 22, 23, and 2 are irradiated.
4 is demagnetized, that is, demagnetized, so that the circumferential width of the magnetic pole is set at the center in the axial direction as described in the above-mentioned prior art, for example, as shown in Japanese Utility Model Application Laid-Open No. 61-68868. Since the same function as reducing from the part toward the both ends can be exhibited without applying various shapes to the magnetic pole as in the past, the air gap magnetic flux density waveform can be easily changed to the target sine wave shape. A permanent magnet rotor that can be adjusted to obtain desired characteristics can be provided.

Embodiment 3 16 and 17 show different configurations of the permanent magnet rotor according to the third embodiment of the present invention, in which a plurality of magnetic poles formed by arc-shaped permanent magnets are mounted on the outer surface of the yoke of the rotor shaft. FIGS. 18 and 19 show a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in the circumferential direction on the outer surface of the yoke of the rotor shaft according to the third embodiment of the present invention. It is a perspective view which shows each different structure of the completed permanent magnet rotor.

In the figure, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and the description is omitted. Reference numeral 25 denotes an irradiation area formed by irradiating a laser to both ends in the circumferential direction and both ends in the axial direction of each magnetic pole 17 and locally heating the magnetic pole 17 to a temperature equal to or higher than the Curie point, as shown in FIG. Although the irradiation area 25 in FIG. 16 shows a case where the irradiation area 25 is formed in a straight line, it goes without saying that the irradiation area 26 may be formed in a curved shape as shown in FIG. 27 are at both ends in the axial direction of the boundary between the magnetic poles 20,
This is an irradiation area formed by irradiating a laser in a tapered shape toward the center and performing local heating at a temperature higher than the Curie point. Although the irradiation area 27 in FIG. 18 shows a case where the irradiation area 27 is formed in a linear shape, it goes without saying that the irradiation area 27 may be formed in a curved shape as shown in FIG.

As described above, according to the third embodiment, the laser beam is applied to the boundary between the magnetic poles 17 and 20, that is, both ends in the circumferential direction and both ends in the axial direction, thereby performing local heating. Since the regions 25, 26, 27, and 28 are set and demagnetization is adjusted, as described in the above-mentioned prior art, for example, as shown in Japanese Patent Application Laid-Open No. Can be exhibited without performing various shape processing as in the related art, so that the waveform of the air gap magnetic flux density is changed to a target sine wave shape as in the case of the second embodiment. A permanent magnet rotor that can be easily adjusted to obtain desired characteristics can be provided.

Embodiment 4 FIG. 20 to 22 show a permanent magnet in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in the circumferential direction are mounted on the outer surface of a yoke of a rotor shaft according to a fourth embodiment of the present invention. It is a perspective view which shows each different structure of a magnet rotor in the state which removed the rotor shaft. In the figure, the same parts as those in each of the first to third embodiments are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 29 denotes an irradiation area formed in the same manner as in each of the above embodiments as shown in FIG.
0 is formed at one axial end so that the axial width increases from the center to both ends. 20 shows the case where the irradiation area 29 is formed at one end in the axial direction of each magnetic pole 20, but as shown in FIG.
May be formed at both ends in the axial direction. Reference numeral 31 denotes an irradiation area formed at the boundary between the magnetic poles 20 so that the width in the circumferential direction decreases from one end in the axial direction to the other end, as shown in FIG.

As described above, according to the fourth embodiment, from the center of each magnetic pole 20 to the boundary, in the case of FIG. 20, it is shaped like a mountain, in the case of FIG. 21, it is made elliptical, and in the case of FIG. Since the demagnetization is adjusted so as to have a trapezoidal shape, similarly to the case of the third embodiment, the waveform of the air gap magnetic flux density can be changed to a target sine wave or It is possible to provide a permanent magnet rotor capable of easily adjusting to a rectangular wave shape and obtaining desired characteristics.

Embodiment 5 FIG. FIGS. 23 to 26 are different from each other in Embodiment 5 of the present invention in which a plurality of magnetic poles formed by arc-shaped or strip-shaped permanent magnets are mounted on the outer surface of a yoke of a rotor shaft. FIG. 2A is a perspective view, FIG. 2B is a front view, and FIG.
7 to 29 show a permanent magnet in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on the outer surface of a yoke of a rotor shaft according to a fifth embodiment of the present invention. 4A and 4B show different configurations of a rotor, wherein FIG. 4A is a perspective view and FIG. 4B is a front view.

Referring to FIG.
The same reference numerals are given to the same parts as those in and the description is omitted. Numeral 32 denotes an irradiation area formed in the same manner as in each of the above embodiments as shown in FIG. 23, over the entire area in the axial direction of each magnetic pole 17 and becomes minimum at the center in the circumferential direction and becomes maximum at both ends in the circumferential direction. The depth is set as follows. In addition,
This irradiation area 32 is shown as being formed on an arc-shaped magnetic pole 17, but as shown in FIG.
The irradiation area 34 may be formed similarly to the irradiation area 32. Reference numeral 35 denotes an irradiation area formed over the entire area in the axial direction of each magnetic pole 17 as shown in FIG. 25 and at both ends in the circumferential direction. Reference numeral 36 denotes a strip-shaped magnetic pole 33 as shown in FIG. This is the formed irradiation area.

The numeral 37 denotes each magnetic pole 20 as shown in FIG.
The cross section is formed in an arcuate shape in an irradiation region in which the depth is set so as to be minimum at the center in the circumferential direction and maximum at both ends in the circumferential direction. It is needless to say that the irradiation region 38 may be formed so that the cross section thereof has a sinusoidal shape as shown in FIG. Further, reference numeral 39 denotes an irradiation region formed over the entire axial direction of each magnetic pole 20 and at both ends in the circumferential direction as shown in FIG.
The cross section is formed in a triangular shape.

As described above, according to the fifth embodiment, the depth is set such that the magnetic poles 17, 20, and 33 have the minimum depth at the center in the circumferential direction and the maximum at both ends in the circumferential direction. Each irradiation area 32, 34, 37, 38
In addition, since the irradiation areas 35, 36, and 39 are formed over the entire area in the axial direction and at both ends in the circumferential direction to adjust the demagnetization, for example, as described in the above prior art, for example, Japanese Patent Application Laid-Open No. Sho 62-114454. Gazette, JP-A-2-142333
As shown in the publication, the same function as in the prior art, such as chamfering the circumferential end face of the magnetic pole or tapering the thickness of the magnetic pole in the radial direction from the center toward both ends. The present invention provides a permanent magnet rotor that can exhibit the desired characteristics by easily adjusting the waveform of the air gap magnetic flux density to a target sine wave shape because the magnetic pole can be exerted without performing various shapes processing on the magnetic pole. can do.

Embodiment 6 FIG. 30 and 31 show different configurations of a permanent magnet rotor in which a plurality of magnetic poles formed by arc-shaped permanent magnets are mounted on the outer surface of a yoke of a rotor shaft according to a sixth embodiment of the present invention. 32 and 33 show a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in the circumferential direction on the outer surface of the yoke of the rotor shaft according to the sixth embodiment of the present invention. It is a perspective view which shows each different structure of the completed permanent magnet rotor.

Referring to FIG.
The same reference numerals are given to the same parts as those in and the description is omitted. As shown in FIG. 30, 40 extends over the entire area of each magnetic pole 17 in the axial direction, and one end in the circumferential direction is sequentially enlarged from one end in the axial direction to the other end, and the other end in the circumferential direction is from one end in the axial direction to the other end. The irradiation area is formed by setting the width so as to sequentially reduce. When the permanent magnets are arranged in two or more rows, the magnetic poles 17 are sequentially shifted by a predetermined angle in the circumferential direction for each row as shown in FIG. 31, and the irradiation areas 40 of each row are arranged obliquely in a straight line. You should do it.

Further, reference numeral 41 denotes each magnetic pole 20 as shown in FIG.
Over the entire area in the axial direction of the boundary portion, and the width in one end in the circumferential direction is gradually increased from one end in the axial direction to the other end, and the width in the other end in the circumferential direction is gradually reduced from one end in the axial direction to the other end. This is an irradiation area formed by setting. When the permanent magnets are arranged in two or more rows, as shown in FIG.
May be sequentially shifted by a predetermined angle in the circumferential direction for each row, and the irradiation areas 41 of each row may be arranged obliquely in a straight line. 31 and 33, each irradiation area 40,
Although the case where 41 are arranged in a straight line has been described, for example, as shown in FIG. 34, each irradiation area 41 may be arranged so as to be shifted by the width of each row.

As described above, according to the sixth embodiment, the circumference of the magnetic pole 17 and the magnetic pole 20 extends over the entire area in the axial direction, and one end in the circumferential direction is sequentially enlarged from one end to the other end. The other end in the direction is set to have a width so as to be sequentially reduced from one end to the other end, and the irradiation areas 40 and 41 are formed to adjust the demagnetization. For example, the same skew effect as disclosed in JP-A-60-226749 and JP-A-57-27872 can be obtained without subjecting the magnetic poles to various shapes as in the prior art. A permanent magnet rotor capable of obtaining desired characteristics can be provided.

Embodiment 7 FIG. FIG. 35 is a perspective view showing a configuration of a permanent magnet rotor in which a plurality of magnetic poles formed by arc-shaped permanent magnets are mounted on the outer surface of a yoke of a rotor shaft according to a seventh embodiment of the present invention. Is a configuration of a permanent magnet rotor according to a seventh embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on an outer surface of a yoke of a rotor shaft. FIG.

In the figure, reference numeral 42 denotes a first magnetic pole having an irradiation area 43 formed over the entire area in the axial direction and at both ends in the circumferential direction and having a width set so as to gradually expand from one end in the axial direction to the other end. , 44 have an irradiation area 45 formed over the entire area in the axial direction and at both ends in the circumferential direction and having a width set so as to sequentially reduce from one end in the axial direction to the other end.
The magnetic poles 42 and 44 are alternately arranged on the outer surface of the yoke 2. As shown in FIG. 36, in the case of the magnetic poles 46 formed by magnetically partitioning a cylindrical permanent magnet in the circumferential direction, the magnetic poles 46 are alternately oriented at the boundary between the magnetic poles 46 with respect to the axial direction. Alternatively, the irradiation area 47 may be formed to be inclined.

As described above, according to the seventh embodiment, the irradiation area formed with the width set so as to gradually expand from one end to the other end in the axial direction over the entire area in the axial direction and at both ends in the circumferential direction. A first magnetic pole 42 having a first magnetic pole 43 and a second magnetic pole having an irradiation area 45 formed by setting a width so as to sequentially reduce from one end in the axial direction to the other end;
Since the shapes of the magnetic poles 42 and 44 are trapezoidal by thermal demagnetization, a skew effect similar to that of the sixth embodiment can be obtained.
Since the magnetic pole can be obtained without subjecting the magnetic pole to various shapes as in the related art, it is possible to provide a permanent magnet rotor capable of easily obtaining desired characteristics. still,
In each of the above embodiments, the case where each irradiation region is formed by irradiating a laser has been described. However, similar effects can be obtained by irradiating an electron beam. Further, in each of the above embodiments, the configuration in which the yoke is fitted to the rotor shaft has been described, but the same applies to the configuration in which the rotor shaft is provided with a step and also serves as the yoke. The effect can be obtained. Furthermore, although not described in the above embodiments, after assembling the permanent magnet to the rotor shaft, each irradiation area is formed and the shape of each magnetic pole is set, so that the assembling accuracy is improved. This eliminates the necessity and facilitates the assembling work.

[0046]

As described above, according to the first aspect of the present invention, in the permanent magnet rotor constituted by mounting a plurality of magnetic poles formed of permanent magnets on the outer surface, the predetermined surface of the magnetic poles By irradiating a laser or an electron beam to the area and performing local heating, the irradiated area is demagnetized to obtain desired magnetic characteristics, so that demagnetization adjustment of the magnetic pole can be easily performed.
A permanent magnet rotor capable of making the air gap magnetic flux density waveform close to a sine wave can be provided.

According to a second aspect of the present invention, in the first aspect, the width of the irradiation area is set so that the width of the irradiation region is minimized at both ends in the circumferential direction of the magnetic pole and at the center in the axial direction, and maximized at both ends in the axial direction. Since each is set, it is possible to provide a permanent magnet rotor capable of easily adjusting the waveform of the air gap magnetic flux density to a target waveform and obtaining desired characteristics.

According to a third aspect of the present invention, in the first aspect, the irradiation regions are set at both ends in the circumferential direction and at both ends in the axial direction of the magnetic pole, respectively, so that the waveform of the air gap magnetic flux density is changed to the target wave shape. Thus, it is possible to provide a permanent magnet rotor that can be easily adjusted to obtain desired characteristics.

According to a fourth aspect of the present invention, in the first aspect, the depth of the irradiation region is set so as to be minimum over the entire area in the axial direction of the magnetic pole and at the center in the circumferential direction and maximum at both ends in the circumferential direction. Are set respectively, it is possible to provide a permanent magnet rotor capable of easily adjusting the waveform of the air gap magnetic flux density to a target waveform and obtaining desired characteristics.

According to the fifth aspect of the present invention, in the first aspect, since the irradiation areas are set over the entire area of the magnetic pole in the axial direction and at both ends in the circumferential direction, the waveform of the air gap magnetic flux density is changed to the target wave shape. Thus, it is possible to provide a permanent magnet rotor that can be easily adjusted to obtain desired characteristics.

According to a sixth aspect of the present invention, in the first aspect, the circumferential direction is such that one end of the magnetic pole extends in the axial direction from one end in the axial direction to the other end. Since the width of the irradiation area is set so that the other end in the direction is sequentially reduced from one end in the axial direction to the other end, a permanent magnet rotor capable of easily obtaining desired characteristics by a skew effect is provided. Can be.

According to a seventh aspect of the present invention, in the first aspect, the irradiation area extends over the entire area of the magnetic pole in the axial direction and extends from one end to the other end in the axial direction at both ends in the circumferential direction. And a second magnetic pole having an irradiation area whose width is set so as to gradually decrease from one end in the axial direction to the other end in the entire axial direction and at both ends in the circumferential direction. Since they are arranged alternately, it is possible to provide a permanent magnet rotor capable of easily obtaining desired characteristics by a skew effect.

According to claim 8 of the present invention, a step of rotating a permanent magnet rotor constituted by mounting a plurality of magnetic poles formed of permanent magnets on the outer surface at a predetermined number of rotations,
Measuring the magnetic or electrical properties of the permanent magnet rotor; irradiating the surface of the magnetic pole with a laser or an electron beam; comparing the measured magnetic or electrical properties with a preset target reference; Setting the laser or electron beam irradiation area based on the comparison result, it is possible to provide a permanent magnet rotor magnetic property adjusting method capable of easily adjusting the magnetic properties of the permanent magnet rotor. .

According to the ninth aspect of the present invention, the magnetic flux density of the magnetic flux generated in the air gap between the magnetic poles of the permanent magnet rotor and between the magnetic poles of the stator disposed opposite to the magnetic poles, Measuring means for measuring at least one of the waveform of the voltage induced between the stator-side wires and the cogging torque,
Local heating means for irradiating the surface of the magnetic pole of the permanent magnet rotor with a laser or an electron beam to locally heat the irradiation area,
Computation control means for comparing the measurement value measured by the measurement means with a preset target reference value and setting an irradiation area based on the comparison result and controlling the local heating means, so that the permanent magnet rotor And a magnetic property adjusting device for a permanent magnet rotor capable of easily adjusting the magnetic properties of the permanent magnet rotor.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a permanent magnet rotor having a plurality of magnetic poles formed by arc-shaped permanent magnets mounted on an outer surface of a yoke of a rotor shaft according to Embodiment 1 of the present invention. .

FIG. 2 is a perspective view of a permanent magnet rotation apparatus according to a first embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on an outer surface of a yoke of a rotor shaft. It is a perspective view which shows the structure of a child.

FIG. 3 shows a configuration different from FIG. 1 of the permanent magnet rotor in which a plurality of magnetic poles formed by arc-shaped permanent magnets are mounted on the outer surface of the yoke of the rotor shaft in the first embodiment of the present invention. FIG.

FIG. 4 is a perspective view of a permanent magnet rotating apparatus according to a first embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on an outer surface of a yoke of a rotor shaft. FIG. 3 is a perspective view showing a configuration different from that of FIG.

FIG. 5 is an enlarged view showing a cross section of a magnetic pole in an enlarged manner to explain the gist of the present invention.

FIG. 6 is a block diagram showing a schematic configuration of a magnetic characteristic adjusting device that performs demagnetization adjustment of the magnetic poles of the permanent magnet rotor shown in FIGS. 1 to 4;

7 is a waveform chart showing a waveform of an air gap magnetic flux density obtained by a Gauss meter of the magnetic characteristic adjusting device in FIG. 6;

8 is a waveform diagram showing a waveform of an induced voltage between lines on a stator side obtained by a Fourier transformer of the magnetic characteristic adjusting device in FIG. 6;

9 is a waveform diagram showing a waveform of a cogging torque obtained by a torque detector of the magnetic characteristic adjusting device in FIG.

FIG. 10 is a perspective view showing a configuration of a permanent magnet rotor in which a plurality of magnetic poles formed by arc-shaped permanent magnets are mounted on an outer surface of a yoke of a rotor shaft according to a second embodiment of the present invention. .

FIG. 11 is a perspective view of a permanent magnet rotor having a plurality of magnetic poles formed by arc-shaped permanent magnets mounted on an outer surface of a yoke of a rotor shaft according to a second embodiment of the present invention, which is different from FIG. FIG.

FIG. 12 is a perspective view of a permanent magnet rotor according to a second embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on the outer surface of a yoke of a rotor shaft. It is a perspective view which shows the structure of a child.

FIG. 13 is a perspective view of a permanent magnet rotor according to a second embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on the outer surface of a yoke of a rotor shaft. FIG. 13 is a perspective view showing a configuration different from that of FIG. 12 of the child.

FIG. 14 is a perspective view of a permanent magnet rotating apparatus according to a second embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on an outer surface of a yoke of a rotor shaft. FIG. 14 is a perspective view showing a configuration different from that of FIG.

FIG. 15 is a perspective view of a permanent magnet rotating apparatus according to a second embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on an outer surface of a yoke of a rotor shaft. FIG. 15 is a perspective view showing a configuration different from that of FIG. 14 of the child.

FIG. 16 is a perspective view showing a configuration of a permanent magnet rotor in which a plurality of magnetic poles formed by arc-shaped permanent magnets are mounted on the outer surface of a yoke of a rotor shaft according to Embodiment 3 of the present invention. .

FIG. 17 is a perspective view of a permanent magnet rotor according to a third embodiment of the present invention, in which a plurality of magnetic poles formed by arc-shaped permanent magnets are mounted on an outer surface of a yoke of a rotor shaft, which is different from FIG. FIG.

FIG. 18 is a perspective view of a permanent magnet rotor according to a third embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on the outer surface of a yoke of a rotor shaft. It is a perspective view which shows the structure of a child.

FIG. 19 is a perspective view of a permanent magnet rotor according to a third embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on the outer surface of a yoke of a rotor shaft. FIG. 19 is a perspective view showing a configuration different from that of FIG. 18 of the child.

FIG. 20 is a perspective view of a permanent magnet rotor according to a fourth embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on the outer surface of a yoke of a rotor shaft. FIG. 4 is a perspective view showing a configuration of a magnetic pole part of the child.

FIG. 21 is a perspective view showing a permanent magnet rotor having a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction on an outer surface of a yoke of a rotor shaft according to a fourth embodiment of the present invention. FIG. 21 is a perspective view showing a configuration of the magnetic pole portion of the child different from that of FIG. 20.

FIG. 22 is a perspective view of a permanent magnet rotor according to a fourth embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on the outer surface of a yoke of a rotor shaft. FIG. 22 is a perspective view showing a configuration of the magnetic pole portion of the child different from that of FIG. 21.

FIG. 23 shows a configuration of a permanent magnet rotor in which a plurality of magnetic poles formed by arc-shaped permanent magnets are mounted on the outer surface of a yoke of a rotor shaft according to a fifth embodiment of the present invention; Is a perspective view, and (B) is a front view.

24A and 24B show a configuration of a permanent magnet rotor in which a plurality of magnetic poles formed by strip-shaped permanent magnets are mounted on an outer surface of a yoke of a rotor shaft according to a fifth embodiment of the present invention; FIG. Is a perspective view, and (B) is a front view.

FIG. 25 is a diagram illustrating a configuration different from FIG. 23 of a permanent magnet rotor in which a plurality of magnetic poles formed by arc-shaped permanent magnets are mounted on the outer surface of a yoke of a rotor shaft according to a fifth embodiment of the present invention. (A) is a perspective view and (B) is a front view.

26 is different from FIG. 24 in the permanent magnet rotor in which a plurality of magnetic poles formed by strip-shaped permanent magnets are mounted on the outer surface of the yoke of the rotor shaft according to the fifth embodiment of the present invention. (A) is a perspective view and (B) is a front view.

FIG. 27 is a perspective view of a permanent magnet rotation apparatus according to a fifth embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on the outer surface of a yoke of a rotor shaft. 2A is a perspective view, and FIG. 2B is a front view.

FIG. 28 is a perspective view of a permanent magnet rotation device according to a fifth embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on the outer surface of a yoke of a rotor shaft. FIG. 27A is a perspective view, and FIG. 27B is a front view, showing a configuration different from FIG.

FIG. 29 is a perspective view of a permanent magnet rotation device according to a fifth embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on an outer surface of a yoke of a rotor shaft. 28A shows a configuration different from that of FIG. 28, wherein FIG. 28A is a perspective view and FIG. 28B is a front view.

FIG. 30 is a perspective view showing a configuration of a permanent magnet rotor having a plurality of magnetic poles formed by arc-shaped permanent magnets mounted on an outer surface of a yoke of a rotor shaft according to a sixth embodiment of the present invention. .

31 is different from FIG. 30 in a permanent magnet rotor in which a plurality of magnetic poles formed by arc-shaped permanent magnets are mounted on an outer surface of a yoke of a rotor shaft according to a sixth embodiment of the present invention. FIG.

FIG. 32 is a perspective view of a permanent magnet rotation device according to a sixth embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on an outer surface of a yoke of a rotor shaft. It is a perspective view which shows the structure of a child.

FIG. 33 is a perspective view of a permanent magnet rotor according to a sixth embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in the circumferential direction are mounted on the outer surface of a yoke of a rotor shaft. 33 is a perspective view showing a configuration different from that of FIG. 32 of the child. FIG.

FIG. 34 is different from FIG. 31 in the permanent magnet rotor in which a plurality of magnetic poles formed by cylindrical permanent magnets are mounted on the outer surface of the yoke of the rotor shaft according to the sixth embodiment of the present invention. FIG.

FIG. 35 is a perspective view showing a configuration of a permanent magnet rotor in which a plurality of magnetic poles formed by arc-shaped permanent magnets are mounted on an outer surface of a yoke of a rotor shaft according to a seventh embodiment of the present invention. .

FIG. 36 is a perspective view of a permanent magnet rotation device according to a seventh embodiment of the present invention, in which a plurality of magnetic poles formed by magnetically partitioning a cylindrical permanent magnet in a circumferential direction are mounted on the outer surface of a yoke of a rotor shaft. It is a perspective view which shows the structure of a child.

[Explanation of symbols]

1 rotor shaft, 2 yokes, 3, 4, 17, 20, 33
Magnetic poles, 5, 18, 19, 21, 22, 23, 24, 2
5,26,27,28,29,30,31,32,3
4,35,36,37,38,39,40,41,4
3, 45 irradiation area, 6 permanent magnet rotor, 7 stator, 8 drive motor, 9 torque detector, 10 rotation detector, 11 Hall element, 12 Gauss meter, 13
Fourier transformer, 14 laser oscillator, 15 irradiation nozzle, 16 operation control means, 42 first magnetic pole, 44
Second magnetic pole.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 1/17 H02K 1/27 H02K 15/03

Claims (9)

(57) [Claims] In a permanent magnet rotor having a plurality of magnetic poles formed of permanent magnets mounted on an outer surface, a predetermined area on the surface of the magnetic pole is irradiated with a laser or an electron beam to perform local heating. A permanent magnet rotor characterized in that the irradiation region is demagnetized by performing the operation so that the air gap magnetic flux density waveform approaches a sine wave . 2. The permanent magnet according to claim 1, wherein the width of the irradiation area is set at both ends in the circumferential direction of the magnetic pole and at the center in the axial direction so as to be minimum and at both ends in the axial direction maximum. Rotor. 3. An irradiation area is set at both ends in the circumferential direction and at both ends in the axial direction of the magnetic pole.
A permanent magnet rotor as described. 4. The depth of the irradiation area is set to be minimum over the entire area of the magnetic pole in the axial direction and at the center in the circumferential direction and maximum at both ends in the circumferential direction.
A permanent magnet rotor as described. 5. The permanent magnet rotor according to claim 1, wherein irradiation regions are set over the entire axial region of the magnetic pole and at both ends in the circumferential direction. 6. The other end in the circumferential direction extends from one end in the axial direction to the other end in such a manner that one end of the magnetic pole extends in the axial direction from one end in the axial direction to the other end. 2. The permanent magnet rotor according to claim 1, wherein the width of the irradiation area is set so as to be sequentially reduced. 7. A first magnetic pole having a width of an irradiation area set so as to extend from one end in the axial direction to the other end in the axial direction over the entire area of the magnetic pole in the axial direction, and the entire area in the axial direction. 2. A second magnetic pole having a width of an irradiation area set so as to extend from one end in the axial direction to the other end in the axial direction at both ends in the circumferential direction. Permanent magnet rotor. 8. A step of rotating a permanent magnet rotor constituted by mounting a plurality of magnetic poles formed of permanent magnets on an outer surface at a predetermined number of revolutions, and magnetic or electric characteristics of the permanent magnet rotor. Measuring, the step of irradiating the surface of the magnetic pole with a laser or an electron beam, and comparing the measured magnetic properties or electrical properties with a preset target reference and based on the comparison result and the laser or Setting a region to be irradiated with an electron beam. 9. A magnetic flux density of a magnetic flux generated in a gap between the magnetic poles of the permanent magnet rotor and between the magnetic poles and a magnetic pole of a stator disposed opposite to each other, and induced between lines on the stator side. The waveform of the voltage to be measured, measuring means for measuring at least one of the cogging torque, and a local heating means for irradiating the surface of the magnetic pole of the permanent magnet rotor with a laser or an electron beam to locally heat the irradiation area, Computation control means for comparing the measurement value measured by the measurement means with a preset target reference value, setting the irradiation area based on the comparison result, and controlling the local heating means. A magnetic property adjusting device for a permanent magnet rotor.