JP2001086710A - Method for manufacturing permanent-magnet motor and magnetizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the intensity distribution of a magnetizing magnetic field uniform at magnetizing of a magnet material provided in a rotor core having space sections. SOLUTION: Space sections 30 are formed in a rotor core 28, and at the same time, a magnet material 29' is attached to the outer peripheral surface of the core 28. A magnetizing device 31 is provided with a magnetizing yoke 33, magnetizing windings 32, and fitting members 34 which are fitted in the space sections 30 and made of a magnetic material. At the magnetization of the magnet material 29', the core 28 is set on the magnetizing device 31. At setting of the core 28 in addition, the fitting members 34 are respectively fitted in the space sections 30, and the windings 32 are energized. When the windings 32 are energized, a sufficient magnetizing magnetic circuit is formed, because the fitting members 34 are fitted in the space sections 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a permanent magnet type motor for magnetizing a magnet material provided on a rotor core having a space, and a magnetizing apparatus.

[0002]

For example, it is necessary to reduce the weight of a motor used in a mobile device such as a vacuum cleaner, and an example of this motor is shown in FIG. In the figure, a permanent magnet type motor is shown,
The stator 1 is configured by inserting and arranging a stator winding 4 in a slot 3 formed in an annular stator core 2.
A permanent magnet rotor 5 is provided inside the stator 1 with a gap. The rotor 5 includes a rotor core 6 having a rotating shaft 6a fixed to the center thereof, and, for example, four permanent magnets 7 attached to the outer periphery of the rotor 6. Furthermore, a plurality of spaces 8 are formed in the rotor core 6 for weight reduction.

As shown in FIG. 20, the magnetizing device 9 is configured by winding a magnetizing winding 11 around an annular magnetizing yoke 10. As shown in FIG. 20, the permanent magnet 7 is magnetized by the magnetizing device 9 in a state where a magnet material 7 'is attached to the rotor core 6 in advance. However,
At the time of this magnetization, since the above-mentioned space portion 8 exists in the rotor core 6, as shown by reference numeral Φ in FIG. 21, the magnetic force line Φ is formed only in a form not passing through the space portion 8. As shown in FIG. 22, the distribution of the intensity of the magnetizing magnetic field of the permanent magnet 7 is weak at the central portion. Therefore, there is a problem that the motor characteristics are deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a uniform distribution of the intensity of a magnetizing magnetic field for magnetizing a magnet material provided on a rotor core having a space. Is where you can do it.

[0005]

According to a first aspect of the present invention, there is provided a method of manufacturing a permanent magnet type motor, wherein a magnet material is provided on a rotor core having a space, and a fitting member made of a magnetic material is provided in the space. Fitting, and magnetizing the magnet material,
The method is characterized by including a step of removing the fitting member and a step of assembling the rotor core and the stator.

In this method of manufacturing a permanent magnet type motor, a magnetic material fitting member is fitted in the space,
Since the magnet material is magnetized, a sufficient magnetizing magnetic circuit is formed, and the magnetizing magnetic field strength distribution of the permanent magnet can be uniformly increased. As a result, it is possible to contribute to the improvement of the motor characteristics.

According to a second aspect of the present invention, there is provided a method of manufacturing a permanent magnet type motor, comprising the steps of: providing a rotor core having a space formed therein with a magnet material; and providing a stator on which the rotor core and the stator winding are wound. Assembling, fitting a fitting member made of a magnetic material into the space portion, magnetizing the magnet material by energizing the stator winding, and removing the fitting member. And has a feature.

In this method of manufacturing a permanent magnet type motor, a magnetic material fitting member is fitted in the space,
Since the magnet material is magnetized, the magnetizing magnetic field strength distribution of the permanent magnet can be uniformly increased. In particular, since the magnet material is magnetized by energizing the stator winding, it is possible to reduce the manufacturing cost without requiring a dedicated magnetized winding.

According to a third aspect of the present invention, in the method for manufacturing a permanent magnet type motor according to the first or second aspect, the fitting member is brought into contact with a portion of the space close to the magnet material. It has a characteristic in the manner described above.
At the time of magnetizing, a magnetic circuit for magnetizing is formed in a portion of the fitting member fitted to the space portion that is close to the magnet material. Thus, in this manufacturing method, the fitting member is
Since the space portion is brought into contact with a portion close to the magnet material, a minimum required magnetic circuit for magnetization is formed, and as a fitting member, even in the space portion,
Since it is sufficient to fit only the portion close to the magnet material, the material used for the fitting member can be reduced.

According to a fourth aspect of the present invention, there is provided the permanent magnet type motor manufacturing method according to the first or second aspect, wherein the fitting member is formed by laminating electromagnetic steel plates. Has features. In this manufacturing method, generation of eddy current in the fitting member can be suppressed, and the magnetizing magnetic field can be strengthened.

According to a fifth aspect of the present invention, there is provided the permanent magnet type motor manufacturing method according to the first or second aspect, wherein the rotor core has a magnet material accommodating portion, and the magnet material is a resin. It is made of a magnet material, and has a feature in that the magnet material is provided on the rotor core by insert molding in the magnet material accommodating portion. In this manufacturing method, the resin-made magnet material is embedded in the magnet material accommodating portion of the rotor core by insert molding. The work is not troublesome, and the arrangement of the magnet material on the rotor core is extremely easy. Further, the degree of freedom of the shape of the magnet material is increased.

According to a sixth aspect of the present invention, there is provided a method of manufacturing a permanent magnet type motor according to any one of the first to fifth aspects, wherein the space is provided on a pole center line. Has features. In this manufacturing method, it is possible to minimize the inhibition of the magnetic path formation by the space portion, and it is possible to suppress the deterioration of the motor characteristics.

According to a seventh aspect of the present invention, in the method of manufacturing a permanent magnet type motor according to the sixth aspect, the space is formed to have a shape expanding toward the rotation center of the rotor core. It has a characteristic where it is. In this manufacturing method, a portion that is not effectively used as a magnetic path can be used as a space portion, so that a reduction in motor characteristics can be suppressed and a reduction in weight can be achieved.

According to an eighth aspect of the present invention, in the method for manufacturing a permanent magnet type motor according to the sixth aspect, a plurality of spaces are provided, some of which are formed in different shapes. It is characterized by where it is. In this manufacturing method, since the shape of the space portion is different,
The output of the permanent magnet is also different, so that the rotational position can be detected. Further, when a specific direction or position is required for the rotor or shaft output, the position can be accurately and easily adjusted when the permanent magnet and the magnetized polarity are matched.

According to a ninth aspect of the present invention, there is provided the magnetizing device, comprising: a magnetizing yoke and a magnetizing winding; It is characterized in that it has a fitting member made of a magnetic material that fits into the space. In this magnetizing device, the magnet material is magnetized in a state where the fitting member made of a magnetic material is fitted in the space, so that a sufficient magnetizing magnetic circuit is formed, The distribution of the magnetizing magnetic field strength of the magnet can be increased uniformly. As a result, it is possible to contribute to the improvement of the motor characteristics.

According to a tenth aspect of the present invention, the magnetizing device is characterized in that the fitting member is configured to contact a portion of the space close to the magnet material. In this magnetizing device, the fitting member is brought into contact with a portion of the space close to the magnet material, so that a minimum necessary magnetic circuit for magnetization is formed. As, it is only necessary to fit only the part close to the magnet material in the space,
The material used for the fitting member can be reduced.

An eleventh aspect of the present invention is characterized in that the fitting member is formed by laminating electromagnetic steel sheets. According to this, the generation of the eddy current in the fitting member can be suppressed, and the magnetizing magnetic field can be strengthened.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In FIG.
4 shows a 4-pole 6-slot permanent magnet motor 21 after manufacture. In the figure, a stator 22 has a stator winding 25 in a slot 24 formed in an annular stator core 23.
Are inserted and arranged. A permanent magnet rotor 26 is provided inside the stator 22 with a gap. The rotor 26 includes a rotor core 28 having a rotating shaft 27 fixed to the center thereof, and, for example, four permanent magnets 29 attached to the outer periphery of the rotor 26.
Further, the rotor core 28 has a space 30 for weight reduction.
Are formed. This space portion 30 is circular, and is formed on the pole center lines C1 to C4 when the pole center lines are denoted by reference numerals C1, C2, C3, and C4.

As shown in FIG. 3, the permanent magnet 29 is magnetized by a magnetizing device 31 in a state where a magnet material 29 'is attached to a rotor core 28 in advance. The magnetizing device 31 has a magnetizing yoke 33 in which a magnetizing winding 32 is wound at a position opposing a magnet material 29 ′, and furthermore, a magnetic material, for example, an iron fitting that fits into the space 30. Joint member 3
4. The winding directions of the magnetized windings 32 are alternately reversed. Also, the fitting member 34
Is formed in a columnar shape so as to be able to fit and contact the space 30 substantially all around, and is attached to the bottom of the magnetic pole yoke 33 through a mounting member (not shown) made of an insulating material.

When magnetizing the magnet material 29 ', the rotor core 28 is set in the magnetizing device 31 as shown in FIG. In this case, each fitting member 34 is fitted into each space 30. Then, the magnetized windings 32 are energized. In this case, since each fitting member 34 is fitted in each space 30, a sufficient magnetizing magnetic circuit Φ is formed as shown in FIG.
Strong magnetization is applied over the entire area. As a result,
As shown in FIG. 4, the magnetizing magnetic field intensity distribution of the permanent magnet 29 can be uniformly increased. Thereafter, the rotor core 28 is taken out of the magnetizing device 31 and inserted and arranged in the stator 22 to constitute the permanent magnet type motor 21.

According to the above-described embodiment, the magnet material 29 'is magnetized in a state where the fitting member 34 made of a magnetic material is fitted in the space 30. The distribution can be strengthened uniformly. As a result, it is possible to contribute to improvement of the motor characteristics. In particular, the space 30 is defined by the polar center line C
Since the space 30 is provided on the C1 to C4, it is possible to minimize the hindrance of the space portion 30 from forming a magnetic path, thereby suppressing a decrease in motor characteristics.

FIGS. 5 to 8 show a second embodiment of the present invention. This embodiment differs from the first embodiment in the following points. That is, as shown in FIG. 6, the rotor core 28 is formed with a magnet material accommodating portion 41 in an arc slit shape. The magnet material 29 'is made of a resin magnet material containing magnetic powder. This magnet material 29 '
Is provided in the rotor core 28 by disposing the rotor core 28 in a mold (not shown) and insert-molding the rotor core 28 in the molten state in the magnet material accommodating portion 41.

After the insert molding (after taking out from the mold), the rotor core 28 is set in the magnetizing device 31 shown in FIG. 7, and at this time, each fitting member 42 is fitted in each space 30. (See FIG. 5). In FIG. 5, the fitting member 42 and the magnet material 29 'are hatched for convenience. The fitting member 42 is formed by stacking electromagnetic steel sheets. Then, the magnetized windings 32 are energized. In this case, since each fitting member 34 is fitted in each space 30, a sufficient magnetic circuit for magnetizing is formed as shown in FIG. Strong magnetization is applied throughout the entire region.

Further, according to the second embodiment, since the resin magnet material is embedded in the magnet material accommodating portion 41 of the rotor core 28 by insert molding, for example, the magnet material made of a magnetic material is accommodated in the magnet material accommodating portion. The press-fitting operation is not troublesome as compared with the case where the press-fitting is arranged in the portion 41, and the arrangement of the magnet material 29 'on the rotor core 28 is extremely easy. In addition, magnet material 2
The degree of freedom of the 9 'shape is increased. Further, according to the second embodiment, since the fitting member 42 is formed by laminating the electromagnetic steel plates, the generation of the eddy current in the fitting member 42 can be suppressed, and the magnetizing magnetic field can be strengthened.

FIGS. 9 and 10 show a third embodiment of the present invention. In this embodiment, the space 43 is
It is formed in a shape that spreads toward the center of rotation of the rotor core 28, and the fitting member 44 is characterized in that it matches the shape. According to this embodiment, a portion that is not effectively used as a magnetic path can be used as the space 43, and a reduction in motor characteristics can be suppressed, and the weight can be reduced.

FIG. 11 shows a fourth embodiment of the present invention.
The third embodiment is different from the third embodiment in that a portion close to the portion is contacted. According to the fourth embodiment, the required minimum magnetic circuit for magnetization is formed, and as the fitting member 45, only the portion of the space 43 close to the magnet material 29 'is used. Therefore, the material used for the fitting member 45 can be reduced.

FIG. 12 shows a fifth embodiment of the present invention, in which a plurality of, for example, four spaces 46 to 49 are provided.
The space portions 46 to 48 are formed in a circular shape, and the remaining one space portion 49 is formed in a non-circular shape (D shape). In this case, the fitting members 50 to 52 corresponding to the space portions 46 to 48 have a columnar shape, and the fitting member 53 corresponding to the space portion 49 is formed in a D-shaped column shape. According to the fifth embodiment, since the shape of one space portion 49 is different, the corresponding permanent magnet 29 is formed.
Are different from each other, so that the rotational position can be detected. Further, when a specific direction or position is required for the rotor 26 or the shaft output, the position can be accurately and easily adjusted when the permanent magnet and the polarity to be magnetized are matched. 18 shows the sixth to eleventh embodiments of the present invention, in which the shape and arrangement of the space 61, the shape of the fitting member 62, and the shape of the magnet material accommodating portion 63 are different. is there.

The present invention may be implemented as follows. That is, a magnet material is provided on the rotor core in which the space is formed, the rotor core and the stator on which the stator core is wound are assembled, and a fitting member made of a magnetic material is fitted in the space. By energizing the stator winding, the magnet material may be magnetized and the fitting member may be removed.

By magnetizing the magnet material by energizing the stator windings as described above, it is possible to reduce the manufacturing cost without requiring a dedicated magnetized winding. In this case, the order of performing the step of assembling the rotor core and the stator on which the stator core is wound and the step of fitting the fitting member made of a magnetic material into the space may be reversed. The fitting member may be separate from the magnetized yoke.

[0030]

As is clear from the above description, the present invention can provide a uniform distribution of the intensity of the magnetizing magnetic field when magnetizing the magnet material provided on the rotor core having the space. This can contribute to improvement of motor characteristics.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, and is a plan view of a rotor and a magnetizing device for showing a state of magnetization.

FIG. 2 is a front view of a motor.

FIG. 3 is a perspective view of a rotor and a magnetizing device before magnetizing.

FIG. 4 is a diagram showing a magnetizing magnetic field of a permanent magnet.

FIG. 5 shows a second embodiment of the present invention, and is a plan view of a rotor core with a fitting member fitted therein.

FIG. 6 is a perspective view of a rotor core before magnetic material insert molding.

FIG. 7 is a perspective view of a rotor and a magnetizing device after magnet material insert molding and before magnetizing.

FIG. 8 is a diagram corresponding to FIG. 1;

FIG. 9 is a view corresponding to FIG. 5, showing a third embodiment of the present invention.

FIG. 10 is a diagram corresponding to FIG. 1;

FIG. 11 is a view corresponding to FIG. 5, showing a fourth embodiment of the present invention;

FIG. 12 is a view corresponding to FIG. 5, showing a fifth embodiment of the present invention.

FIG. 13 is a view corresponding to FIG. 5, showing a sixth embodiment of the present invention.

FIG. 14 is a view corresponding to FIG. 5, showing a seventh embodiment of the present invention;

FIG. 15 is a view corresponding to FIG. 5, showing an eighth embodiment of the present invention.

FIG. 16 is a view corresponding to FIG. 5, showing a ninth embodiment of the present invention;

FIG. 17 is a view corresponding to FIG. 5, showing a tenth embodiment of the present invention;

FIG. 18 is a view corresponding to FIG. 5, showing an eleventh embodiment of the present invention.

FIG. 19 is a diagram corresponding to FIG. 2 showing a conventional example.

FIG. 20 is a diagram corresponding to FIG. 3;

FIG. 21 is a diagram corresponding to FIG. 1;

FIG. 22 is a diagram corresponding to FIG. 4;

[Explanation of symbols]

21 is a permanent magnet type motor, 22 is a stator, 23 is a stator core, 25 is a stator winding, 26 is a rotor, 28 is a rotor core, 29 is a permanent magnet, 29 'is a magnet material, and 30 is a space. , 31 are a magnetizing device, 32 is a magnetized winding, 33 is a magnetized yoke, 34 is a fitting member, 41 is a magnet material accommodating portion, 42 is a fitting member, 43 is a space portion, and 44 and 45 are fitted. Reference numerals 46 to 49 denote space portions, 50 to 53 denote fitting members, 61 denotes a space portion, and 62 denotes a fitting member.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H02K 21/14 H02K 21/14 MF term (reference) 5H615 AA01 BB01 BB07 BB14 PP02 SS05 SS51 TT05 5H619 AA01 AA05 BB01 BB13 BB15 PP02 PP08 PP14 5H621 AA03 BB07 GA01 GA04 GA11 JK02 JK05 5H622 AA03 CA02 CA05 CA10 CA13 PP03 PP19 QB02 QB09 QB10

Claims (11)

[Claims] A step of providing a magnet material on a rotor core in which a space is formed; a step of fitting a fitting member made of a magnetic material into the space; and a step of magnetizing the magnet material; A method for manufacturing a permanent magnet motor, comprising: a step of removing the fitting member; and a step of assembling the rotor core and a stator. 2. A step of providing a magnet material on a rotor core in which a space is formed; a step of assembling the rotor core with a stator on which a stator winding is wound; and a magnetic material in the space. A permanent magnet type comprising: a step of fitting a fitting member made of stainless steel; a step of magnetizing the magnet material by supplying electricity to the stator winding; and a step of removing the fitting member. Motor manufacturing method. 3. The method of manufacturing a permanent magnet type motor according to claim 1, wherein the fitting member is brought into contact with a portion of the space that is close to the magnet material. 4. The method for manufacturing a permanent magnet motor according to claim 1, wherein the fitting member is formed by laminating electromagnetic steel sheets. 5. The rotor core has a magnet material housing, and the magnet material is made of a resin magnet material, and the rotor core is provided with the magnet material by insert molding in the magnet material housing. The method for manufacturing a permanent magnet type motor according to claim 1 or 2, wherein 6. The method for manufacturing a permanent magnet motor according to claim 1, wherein the space is provided on a pole center line. 7. The method for manufacturing a permanent magnet motor according to claim 6, wherein the space portion is formed in a shape expanding toward a rotation center portion of the rotor core. 8. The method for manufacturing a permanent magnet motor according to claim 6, wherein a plurality of space portions are provided, and some of the space portions are formed in different shapes. 9. A magnetizing device that includes a magnetizing yoke and a magnetizing winding and magnetizes a rotor having a permanent magnet material having a space formed in a rotor core, wherein the magnet fits into the space. A magnetizing device having a fitting member made of a material. 10. The magnetizing device according to claim 9, wherein the fitting member is configured to come into contact with a portion of the space close to the magnet material. 11. The magnetizing device according to claim 9, wherein the fitting member is formed by laminating electromagnetic steel sheets.