JP2002223548A - Polarizing device for permanent magnet rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polarizing device for permanent magnet motor capable of facilitating coil winding work and improving polarizing accuracy. SOLUTION: This polarizing device includes a first cylindrical magnetic member 11, a second cylindrical magnetic member 12 which is fitted into the first cylindrical magnetic member 11 and in which a plurality of grooves 13 extending axially in the outer periphery of the fitted section are formed at prescribed intervals in the peripheral direction, and the coil 18 wound along the respective grooves 13 in the second cylindrical magnetic member 12. By energizing the coil 18, permanent magnets which are not magnetized in the permanent magnet rotor are polarized, and are disposed so as to face each other via air-gaps inside the second cylindrical magnetic member 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a magnetizing device for a permanent magnet rotor which forms a magnetic pole by magnetizing an unmagnetized permanent magnet disposed on an outer peripheral surface of the rotor.

[0002]

2. Description of the Related Art A conventional magnetizing device for a permanent magnet rotor disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 9-163692 has a cylindrical shape around a rotor (not shown) as shown in FIG. And the magnetized iron core 1
The coils 2 are wound around a plurality of grooves 1a formed at positions opposed to the unmagnetized permanent magnets of the rotor, respectively, so that the directions of the coils 2 adjacent to each other are different. Each non-magnetized permanent magnet is magnetized by passing a current, and magnetized so that the magnetic poles alternately become N-pole and S-pole.

[0003]

As described above, in the conventional permanent magnet rotor magnetizing device, a plurality of grooves 1a extending in the axial direction are formed in the inner circumferential surface of the magnetized iron core 1 in the circumferential direction. And the coil 2 is wound around each of the grooves 1a. Therefore, the coil 2 must be wound around each of the grooves 1a formed on the inner peripheral surface of the magnetized iron core 1. Therefore, the winding operation becomes difficult, and the winding accuracy of the coil 2 is deteriorated, so that a desired magnetization accuracy cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a magnetizing device for a permanent magnet rotor which can easily wind a coil and improve the magnetizing accuracy. It is intended to provide.

[0005]

According to a first aspect of the present invention, there is provided a magnetizing device for a permanent magnet rotor, wherein the magnetizing device is fitted inside a first cylindrical magnetic member and inside the first cylindrical magnetic member. A second cylindrical magnetic member having a plurality of axially extending grooves formed at predetermined intervals in the circumferential direction on the outer peripheral surface to be fitted, and each groove of the second cylindrical magnetic member; And a coil wound along the coil. When the coil is energized, the non-magnetized permanent magnet of the permanent magnet rotor disposed opposite to the inside of the second cylindrical magnetic member via a gap is magnetized. It is like that.

Further, a permanent magnet rotor magnetizing device according to claim 2 of the present invention is such that each groove is skewed in claim 1.

According to a third aspect of the present invention, in the magnetizing apparatus for a permanent magnet rotor according to the first or second aspect, the second cylindrical magnetic member has the same cross-sectional shape as each groove on the outer peripheral side. A plurality of annular magnetic plate members having a plurality of notches formed at the same intervals as the respective grooves are stacked and configured such that the respective notches are sequentially shifted in the circumferential direction, and the grooves skewed by the respective notches. Is formed.

According to a fourth aspect of the present invention, there is provided a permanent magnet rotor magnetizing apparatus according to the second or third aspect, wherein both end surfaces of the second cylindrical magnetic member are successively arranged in a plane perpendicular to each groove. It is formed in a continuous zigzag shape.

According to a fifth aspect of the present invention, there is provided a magnetizing device for a permanent magnet rotor according to any one of the first to fourth aspects, wherein a portion left inside each groove of the second cylindrical magnetic member. Has a thickness of 0.5 mm or less.

According to a sixth aspect of the present invention, there is provided a magnetizing device for a permanent magnet rotor according to any one of the first to fourth aspects, wherein both axial end faces of the second cylindrical magnetic member are provided. A chamfer is formed at a corner where the inner surface intersects.

According to a seventh aspect of the present invention, there is provided the permanent magnet rotor magnetizing apparatus according to any one of the first to sixth aspects, wherein the inner surface of each groove of the second cylindrical magnetic member is coated by electrodeposition. It is intended to be applied.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. FIG. 1 is a perspective view showing a configuration of a permanent magnet rotor magnetizing apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a first and second cylindrical magnets of the permanent magnet rotor magnetizing apparatus shown in FIG. FIG. 3 is a perspective view showing a state where members are separated.
FIG. 4 is a characteristic diagram showing the relationship between the thickness of the portion left inside each groove of the second cylindrical magnetic member and the magnetic flux density, FIG. 4 is a diagram showing the measurement position of the magnetic flux density in FIG. 3, and FIG. It is sectional drawing which shows the shape of the edge part of each groove | channel of a 2nd cylindrical magnetic member.

In the drawing, reference numeral 11 denotes a first cylindrical magnetic member, and 12 denotes a second cylindrical magnetic member fitted inside the first cylindrical magnetic member 11, and an outer peripheral surface fitted with the second cylindrical magnetic member. Are formed with a plurality of grooves 13 extending in the axial direction at predetermined intervals in the circumferential direction, and the thickness (indicated by t in FIG. 4) of the portion left inside each groove 13 is It is formed to a thickness of 0.5 mm or less that does not impair the mechanical strength.
Then, both end surfaces 1 in the axial direction of the second cylindrical magnetic member 12
A corner 16 or 17 at which the groove 4 intersects the inner surface 15 of each groove 13 is chamfered 16 or 17 as shown in FIG. 5, and the inner surface 15 of each groove 13 is electrodeposited. Reference numeral 18 denotes a coil wound around each groove 13. The coils 18 are configured by a power supply device (not shown) so that the directions of currents flowing adjacent to each other are different.

Next, each groove 1 of the second cylindrical magnetic member 12
The reason why the thickness t of the portion left inside 3 is formed to be 0.5 mm or less will be described. First, coil 1
8, a current of 10 KA was applied to the coil 1 as shown in FIG.
8 on the straight line L inclined 4 degrees from the center of the inner surface of the second cylindrical magnetic member 12,
Changes in magnetic flux density at positions separated by 1.0 mm and 1.5 mm are represented by thicknesses t of 0 mm, 0.25 mm, 0.5 mm,
The measurement was performed for 0.75 mm and 1.0 mm, respectively, and the results were shown by curves A, B, C, D, and E in FIG.

As is apparent from FIG. 3, the magnetic flux density increases as the thickness t decreases, and decreases as the distance from the inner peripheral surface of the second cylindrical magnetic member 12, that is, as the distance from the coil 18, decreases. I have. On the other hand, when the decrease of the magnetic flux density at each position is compared with each of the curves A, B, C, D, and E, the curves A,
Regarding B and C, even at a position 1.5 mm away,
Although a desired magnetic flux density of 2 T (tesla), which must be ensured when a current of 0 KA flows, is maintained, the curves D and E are 2 T (tesla) or less, and the wall thickness t is 0. 0.75mm, 1.0mm larger than 5mm
In case (2), it is difficult to maintain the desired magnetic flux density, and it is clear that the thickness t must be formed to 0.5 mm or less.

As described above, according to the first embodiment, the magnetized iron core is connected to the first cylindrical magnetic member 11 and the second cylindrical magnetic member 11 fitted inside the first cylindrical magnetic member 11. As shown in FIG. 2, the coil 1 is divided into magnetic members 12 and each groove 13 formed on the outer peripheral surface of the second cylindrical magnetic member 12
After winding the coil 8, the magnetizing device is formed by fitting the inside of the first cylindrical magnetic member 11 to form a magnetizing device. Since only the winding accuracy of the coil can be improved, a desired magnetization accuracy can be obtained.

Each groove 13 of the second cylindrical magnetic member 12
Since the thickness t of the portion left inside is less than 0.5 mm, a desired magnetic flux density can be secured, and both ends of the second cylindrical magnetic member 12 in the axial direction can be secured. Face 1
4 and the inner surface 15 of each groove 13 intersect with a chamfer 1
Since the steps 6 and 17 are performed, it is possible to prevent the insulating film of the coil 18 from being peeled off by the corners and the insulating property from being lowered. In addition, since the inner surface 15 of each groove 13 of the second cylindrical magnetic member 12 is subjected to the electrodeposition coating, the insulation can be improved.

Embodiment 2 FIG. FIG. 6 is a perspective view showing a configuration of a permanent magnet rotor magnetizing apparatus according to Embodiment 2 of the present invention, and FIG. 7 is a first and second cylindrical magnets of the permanent magnet rotor magnetizing apparatus shown in FIG. It is a perspective view showing the state where members were separated. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. 19
Is a second cylindrical magnetic member fitted inside the first cylindrical magnetic member 11, and a plurality of skewed axially extending grooves 20 are formed on the fitted outer peripheral surface in the circumferential direction. Are formed at predetermined intervals.

Although not shown, as in the first embodiment, the thickness of the portion left inside each groove 20 is 0.5 mm or less, and is formed to a thickness that does not impair the mechanical strength. Also, the corners where the axial both end surfaces of the second cylindrical magnetic member 19 intersect with the inner surface of each groove 20 are chamfered, and the inner surface of each groove 20 is coated with electrodeposition. It has been subjected.

As described above, according to the second embodiment, since the groove 20 is formed on the outer peripheral surface of the second cylindrical magnetic member 19, the skew processing is facilitated, and the skew magnetization with high precision is achieved. It is possible to improve characteristics such as cogging torque and torque ripple of the permanent magnet rotor.

As shown in FIG. 8, a plurality of notches 21 having the same sectional shape on the outer peripheral side as the grooves 20 in FIG. As shown in FIG. 9, the annular magnetic plate member 22 may be laminated so that the notches 21 are sequentially shifted in the circumferential direction to form the second cylindrical magnetic member 23. In addition to the effect similar to that of the configuration shown in FIG. 7, the generation of eddy current can be prevented by the laminating effect, and the punching process using a mold becomes possible. And the cost can be reduced.

Embodiment 3 FIG. FIG. 10 is an exploded view showing a configuration of a main part of a permanent magnet rotor magnetizing apparatus according to a third embodiment of the present invention. FIG. 11 is a view for explaining the principle of the invention applied to the third embodiment. FIG. In the figure, the same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 24 denotes a second cylindrical magnetic member in which a plurality of grooves 25 skewed on the outer peripheral surface and extend in the axial direction are formed at predetermined intervals in the circumferential direction as in the second embodiment. The two axial end faces are each groove 2
A surface 26 orthogonal to 5 is formed in a zigzag shape which is sequentially connected in the circumferential direction.

Although not shown, as in the first embodiment, the thickness of the portion left inside each groove 25 is 0.5 mm or less, and is formed to a thickness that does not impair the mechanical strength. In addition, the corners where the both end surfaces in the axial direction of the second cylindrical magnetic member 24 intersect with the inner surface of each groove 25 are chamfered, and the inner surface of each groove 25 is coated with electrodeposition. It has been subjected.

Next, the reason why both end surfaces of the second cylindrical magnetic member 24 are formed in a zigzag shape in which surfaces 26 orthogonal to the respective grooves 25 are sequentially connected in the circumferential direction will be described. First, for example, in the case of the second cylindrical magnetic member 19 according to the second embodiment, as shown in FIG. 11A, a magnetic flux Φ induced by a current I flowing through the coil 18 near the end face thereof.
Is to try to Toro a second cylindrical magnetic member 19 inside the atmosphere, the left in the figure the coil 18, i.e. the angle alpha ₁ of the end face and the coil _18, the corner alpha ₁ side of the narrower of the alpha ₂ As a result, the magnetized permanent magnet is formed to be greatly inclined to the right side of the inclination of the coil 18, so that there is a problem that the skew magnetization is not accurately performed.

On the other hand, the second circle in the third embodiment
In the case of the cylindrical magnetic member 24, both ends of each groove 25 are directly
Intersection, that is, a surface 26 orthogonal to the coil 18 is formed
Therefore, as shown in FIG.
Angle between the coil 26 and the coil 18 ₁, Α₂Are equal and the magnetic
Bundle Φ is evenly distributed on both sides and magnetic flux density is equal on both sides
As a result, the magnetized permanent magnet tilts the coil.
Skew magnetization is performed accurately.
Is

As described above, according to the third embodiment, both end surfaces of the second cylindrical magnetic member 24 are formed in a zigzag shape in which the surfaces 26 orthogonal to the respective grooves 25 are successively connected in the circumferential direction. Since the angles α ₁ and α ₂ formed between the end face and the coil 18 can be made equal by the respective surfaces 26 and the magnetic flux densities on both sides of the coil 18 can be evenly distributed, the magnetization of the permanent magnets is , The skew magnetization can be performed with higher accuracy, and the characteristics of the permanent magnet rotor such as cogging torque and torque ripple can be further improved.

[0027]

As described above, according to the first aspect of the present invention, the first cylindrical magnetic member and the outer peripheral surface fitted inside the first cylindrical magnetic member are fitted. A second cylindrical magnetic member formed with a plurality of grooves extending in the axial direction at predetermined intervals in the circumferential direction, and wound along each groove of the second cylindrical magnetic member A coil, and energizing the coil to magnetize the non-magnetized permanent magnet of the permanent magnet rotor that is disposed opposite to the inside of the second cylindrical magnetic member via a gap. It is possible to provide a permanent magnet rotor magnetizing device that can easily perform the winding operation and improve the magnetizing accuracy.

According to a second aspect of the present invention, since each groove is skewed in the first aspect, skew processing is facilitated and characteristics such as cogging torque and torque ripple of the permanent magnet rotor are improved. It is possible to provide a permanent magnet rotor magnetizing device that can be improved.

According to a third aspect of the present invention, in the first or second aspect, the second cylindrical magnetic member is provided on the outer peripheral side with the same cross-sectional shape as each groove and at the same interval as each groove. A plurality of annular magnetic plate members formed with a plurality of notches are stacked and configured such that each notch is sequentially shifted in the circumferential direction,
Since the skewed groove is formed in each notch, it is possible to provide a permanent magnet rotor magnetizing device that can increase productivity and reduce cost.

According to a fourth aspect of the present invention, in the second or third aspect, both end surfaces of the second cylindrical magnetic member are formed in a zigzag shape in which surfaces orthogonal to the respective grooves are sequentially connected. Therefore, it is possible to provide a permanent magnet rotor magnetizing device capable of performing skew magnetization with higher accuracy and improving characteristics such as cogging torque and torque ripple of the permanent magnet rotor.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the thickness of a portion left inside each groove of the second cylindrical magnetic member is 0.5 mm. As described below, it is possible to provide a permanent magnet rotor magnetizing device capable of securing a desired magnetic flux density and improving magnetization accuracy.

According to a sixth aspect of the present invention, in any one of the first to fourth aspects, a chamfer is formed at a corner where the axial both end surfaces of the second cylindrical magnetic member and the inner surfaces of the grooves intersect. Therefore, it is possible to provide a permanent magnet rotor magnetizing device capable of preventing a decrease in insulation.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the inner surface of each groove of the second cylindrical magnetic member is subjected to electrodeposition coating, so that the insulating property is improved. It is possible to provide a permanent magnet rotor magnetizing device capable of improving the performance.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a magnetizing device for a permanent magnet rotor according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing a state in which first and second cylindrical magnetic members of the permanent magnet rotor magnetizing device in FIG. 1 are separated.

FIG. 3 is a characteristic diagram showing a relationship between a thickness of a portion left inside each groove of the second cylindrical magnetic member and a magnetic flux density.

FIG. 4 is a diagram showing a measurement position of a magnetic flux density in FIG. 3;

FIG. 5 is a cross-sectional view showing the shape of the end of each groove of the second cylindrical magnetic member.

FIG. 6 is a perspective view showing a configuration of a permanent magnet rotor magnetizing apparatus according to Embodiment 2 of the present invention.

7 is a perspective view showing a state in which first and second cylindrical magnetic members of the magnetizing device for a permanent magnet rotor in FIG. 6 are separated.

FIG. 8 is a plan view showing a main part of a magnetizing device for a permanent magnet rotor according to a second embodiment of the present invention, which has a configuration different from that of FIG. 6;

FIG. 9 is a side view showing a main part in FIG.

FIG. 10 is an expanded view showing a configuration of a main part of a magnetizing device for a permanent magnet rotor according to a third embodiment of the present invention.

FIG. 11 is a diagram for explaining the principle of the invention applied to the third embodiment.

FIG. 12 is a perspective view showing a configuration of a conventional magnetizing device for a permanent magnet rotor.

[Explanation of symbols]

11 first cylindrical magnetic member, 12, 19, 23, 24
Second cylindrical magnetic member, 13, 20, 25 grooves, 14
End face, 15 inner face, 16, 17 chamfer, 18 coil, 21 notch, 22 annular magnetic plate member, 26
surface.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masafumi Okazaki 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Koichiro Kamei 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F term in Ryo Denki Co., Ltd. (reference) 5H622 AA03 CA01 CA05 QB03 QB09 QB10

Claims (7)

[Claims] 1. A first cylindrical magnetic member, and a plurality of axially extending grooves are fitted on an inner peripheral surface of the first cylindrical magnetic member and are fitted in an outer peripheral surface of the first cylindrical magnetic member. A second cylindrical magnetic member formed with an interval of, and coils wound along each of the grooves of the second cylindrical magnetic member. 2. A magnetizing device for a permanent magnet rotor, wherein an unmagnetized permanent magnet of a permanent magnet rotor arranged opposite to the inside of the cylindrical magnetic member via an air gap is magnetized. 2. The magnetizing device for a permanent magnet rotor according to claim 1, wherein each groove is skewed. 3. The second cylindrical magnetic member includes a plurality of annular magnetic plate members having the same cross-sectional shape as the respective grooves on the outer peripheral side and having a plurality of notches formed at the same intervals as the respective grooves. 3. The permanent magnet rotor according to claim 2, wherein said cutouts are laminated so as to be sequentially shifted in a circumferential direction, and said cutouts form skewed grooves. Porcelain device. 4. The permanent magnet rotor according to claim 2, wherein both end surfaces of the second cylindrical magnetic member are formed in a zigzag shape in which surfaces orthogonal to the respective grooves are sequentially connected. Magnetizer. 5. The permanent member according to claim 1, wherein a thickness of a portion left inside each groove of the second cylindrical magnetic member is 0.5 mm or less. Magnet rotor magnetizing device. 6. The corner according to claim 1, wherein corners at which both axial end surfaces of the second cylindrical magnetic member intersect with inner surfaces of the grooves are chamfered. Permanent magnet rotor magnetizing device. 7. The magnetizing device for a permanent magnet rotor according to claim 1, wherein an inner surface of each groove of the second cylindrical magnetic member is coated with an electrodeposition coating. .