JP2008017543A - Motor magnetization method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor magnetization method that can obtain large magnetization effects by a small magnetization current even if a rotor is magnetized in a state of combining permanent magnets with a back yoke. <P>SOLUTION: The motor magnetization method is used for a motor provided with an outer rotor 6 which has permanent magnets 14 and the back yoke (an annular region located radially externally from permanent magnets 14 of a rotor core 15), and having a space on the side opposite to the permanent magnets 14 with respect to the back yoke. A magnetization unit 40 is arranged on the permanent-magnet 14 side of the outer rotor 6 while being spaced apart at a gap between the outer rotor 6 and the unit. An auxiliary yoke 44 formed of a magnetic body is arranged on the side opposite to the permanent magnets 14 with respect to the back yoke so as to magnetize the outer rotor 6 by the magnetization unit 40. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for magnetizing a motor, and more particularly to a method for magnetizing a motor including an outer rotor and an axially opposed rotor.

  Magnetization of an outer rotor or an axially opposed rotor used in a motor is performed by energizing a magnetizer or a stator with a permanent magnet incorporated in the rotor.

  In such motors, the back yoke width of the rotor is usually designed to be sufficient for normal operation. That is, under normal operating conditions, the rotor back yoke width is reduced as much as possible without causing saturation, thereby reducing the size and reducing the cost. For this reason, in the magnetization, the back yoke is easily saturated by the magnetic flux generated by the large current flowing in the magnetizer or the stator.

  In the case of an outer rotor or an axially opposed rotor, the back yoke is generally determined by magnetic requirements, so the rotor back yoke easily magnetically saturates when magnetized, and a very large current is required to obtain the required magnetization. There is a problem of becoming. The inner rotor usually has a sufficient back yoke because the inner diameter of the rotor is engaged with the shaft.

On the other hand, when magnetizing a single magnet, a cylindrical magnetized yoke is provided with a predetermined gap and a permanent magnet is disposed, and a permanent magnet and a fixed gap are provided on the opposite side of the magnetized yoke via the permanent magnet. There is an auxiliary yoke that is spaced apart, and current is passed through a magnetizing coil wound around the magnetizing yoke to magnetize the permanent magnet (see, for example, Japanese Patent Application Laid-Open No. 11-288813 (Patent Document 1)). ). However, when such a permanent magnet, which is magnetized as a single unit, is later mated with the rotor core, the permanent magnet is attracted to the rotor core, which makes handling extremely complicated.
Japanese Patent Laid-Open No. 11-288813

  Accordingly, an object of the present invention is to provide a method for magnetizing a motor that can obtain a large magnetizing effect with a small magnetizing current even when a rotor is magnetized in a state where a permanent magnet and a back yoke are combined.

In order to solve the above problem, the magnetizing method of the motor of the present invention includes:
A method of magnetizing a motor comprising a rotor having a permanent magnet and a back yoke, and having a space on the opposite side of the permanent magnet with respect to the back yoke at the time of magnetization,
On the permanent magnet side of the rotor, a magnetizer is arranged with a gap between the rotor or in close contact with the rotor,
An auxiliary yoke made of a magnetic material is disposed in the space opposite to the permanent magnet with respect to the back yoke,
The rotor is magnetized by the magnetizer.

  According to the magnetizing method of the motor, a motor including an outer rotor having a permanent magnet and a back yoke, an axially opposed rotor, or the like is magnetic at least on the opposite side of the permanent magnet to the back yoke when magnetized. There is a space in which an auxiliary yoke can be placed. A magnet is disposed on the permanent magnet side of the rotor of such a motor with a gap between or in close contact with the rotor, and in the space on the opposite side of the permanent magnet with respect to the back yoke, An auxiliary yoke consisting of the above is arranged, and the rotor is magnetized by a magnetizer. At this time, high magnetic flux density at the time of magnetization can be dispersed by the auxiliary yoke to lower the magnetic resistance, and the same magnetizing effect as when there is no auxiliary yoke even if the current flowing through the magnetizing coil of the magnetizer is reduced Is obtained. Further, even when the same current as that without the auxiliary yoke is passed through the magnetizing coil of the magnetizer, a larger magnetizing effect can be obtained. Therefore, even if the rotor is magnetized in a state where the permanent magnet and the back yoke are combined, a large magnetizing effect can be obtained with a small magnetizing current.

  Further, in the motor magnetizing method, the back yoke does not saturate after the magnetizing current is passed, and the magnetic flux leaking from the back yoke becomes extremely small, so that the auxiliary yoke and the rotor can be easily separated. Therefore, the auxiliary yoke and the back yoke may be narrowed or brought into contact with each other, so that the auxiliary yoke can also be used for positioning the rotor. In particular, when magnetized with the rotor incorporated in the mechanism, the rotor may be deformed or the rotational axis may be displaced due to the attractive force at the time of magnetization, but by positioning the rotor using an auxiliary yoke, Such a problem can be solved.

  In one embodiment of the motor magnetizing method, the gap length between the back yoke and the auxiliary yoke of the rotor is smaller than the gap length between the magnetizer and the rotor.

  According to the above-described embodiment, by making the gap length between the back yoke and the auxiliary yoke of the rotor smaller than the gap length between the magnetizer and the rotor, the rotor due to the contact between the magnetizer and the rotor. The rotor can be fixed by the auxiliary yoke while preventing damage to the air gap (particularly the surface facing the air gap). Usually, the anti-air gap surface of the back yoke is thick enough to take a sufficient magnetic path, so that there is no problem in strength even if the auxiliary yoke contacts the back yoke. Note that the air gap surface is provided with a thin part to prevent leakage of magnetic flux between the poles even when the permanent magnet is directly exposed and even when the permanent magnet is embedded in the magnetic body. Normally, contact between the magnetizer and the rotor is undesirable.

  In one embodiment of the motor magnetizing method, the auxiliary yoke has a rotation preventing means provided on the auxiliary yoke side to prevent the rotor from rotating.

  According to the above embodiment, the rotation of the rotor is prevented by the rotation preventing means provided on the auxiliary yoke side, so that the position of the rotor can be fixed and reliable magnetization can be performed.

  In one embodiment of the motor magnetizing method, the back yoke of the rotor is not magnetically saturated when assembled as a motor.

  According to the embodiment described above, good motor characteristics can be obtained because the back yoke of the rotor is not magnetically saturated when assembled as a motor. Here, the magnetic saturation is a magnetic flux density in the vicinity of the knick point where the inclination is reduced in the BH curve (magnetic hysteresis curve). For example, in the case of a normal electromagnetic steel sheet, it is about 1.7 to 1.8 Tesla. The material may be selected depending on each magnet type, such as about 2.0 Tesla if electromagnetic soft iron is used, and about 2.3 Tesla if permendur is used.

  In one embodiment of the method for magnetizing a motor, the surface of the magnetized yoke portion of the magnetizer facing the permanent magnet is narrower than the magnetic pole area of the permanent magnet, and the auxiliary yoke The surface facing the permanent magnet is wider than the magnetic pole area of the permanent magnet.

  According to the above embodiment, the surface of the magnetized yoke portion of the magnetizer facing the permanent magnet of the magnetic material is made narrower than the magnetic pole area of the permanent magnet, thereby collecting the magnetic flux in the center direction of the magnetic pole surface to obtain the gap magnetic flux. By increasing the density and making the surface of the auxiliary yoke facing the permanent magnet wider than the magnetic pole area of the permanent magnet, the effect of lowering the magnetic resistance by dispersing the high magnetic flux density during magnetization by the auxiliary yoke is enhanced. Therefore, the strength of magnetization of the rotor can be further improved.

  In the motor magnetizing method according to an embodiment, the auxiliary yoke has a fixed position relative to the magnetizer.

  According to the above embodiment, for example, the magnetizer and the auxiliary yoke are integrated by a resin mold or the like, and the rotor is fixed and positioned by the auxiliary yoke whose relative position with the magnetizer is fixed. It is possible to determine the relative position of the rotor with respect to the magnetizer while ensuring a gap between the rotor and the rotor.

  In the magnetizing method of the motor according to one embodiment, after the magnetization, the magnetic poles are opposite to those at the time of magnetization, and a current sufficiently smaller than that at the time of magnetization is passed through the magnetizing coil of the magnetizer. And release the rotor.

  According to the above-described embodiment, the magnetic pole is opposite to that at the time of magnetization, and a repulsive force is generated between the magnetizer and the rotor by causing a sufficiently small current to flow through the magnetizing coil of the magnetizer. The magnetizer and the rotor can be easily separated, improving workability. The current value at this time must be sufficiently smaller than the magnetizing current so that the permanent magnet does not demagnetize.

  In the motor magnetizing method according to an embodiment, the magnetizer also serves as a stator disposed with an air gap therebetween.

  According to the above embodiment, the stator arranged with the rotor and the air gap spaced apart also serves as a magnetizer, so that it is not necessary to remove the magnetizer after magnetization and the process can be simplified.

  In one embodiment of the motor magnetizing method, the stator and the rotor to be opposed to each other with an air gap interposed therebetween are planes perpendicular to the rotation axis to which the rotor is fixed.

  According to the above embodiment, in the axial gap type motor in which the surface to be opposed to the stator and the rotor arranged with the rotor and the air gap therebetween is a plane perpendicular to the rotation axis to which the rotor is fixed, Even if the magnetizing method is applied to magnetize the rotor in a state where the permanent magnet and the back yoke are combined, a large magnetizing effect can be obtained with a small magnetizing current.

Moreover, in the magnetizing method of the motor of one embodiment,
The rotor has a substantially cylindrical shape,
A stator is disposed inside the rotor,
The outer peripheral surface of the stator and the inner peripheral surface of the rotor face each other with an air gap therebetween.

  According to the above embodiment, in the outer rotor type motor in which the outer peripheral surface of the stator disposed on the inner side of the substantially cylindrical rotor and the inner peripheral surface of the rotor face each other with an air gap therebetween, the magnetization of the motor is performed. Even if the method is applied to magnetize the rotor in a state where the permanent magnet and the back yoke are combined, a large magnetization effect can be obtained with a small magnetization current.

  In one embodiment of the motor magnetizing method, at least one of the inner peripheral surface of the auxiliary yoke and the outer peripheral surface of the rotor is preliminarily coated with a coating having a lower coefficient of friction than the processed surface of iron.

  According to the above-described embodiment, the coating of the rotor back yoke and the auxiliary yoke is performed in advance on at least one of the inner peripheral surface of the auxiliary yoke and the outer peripheral surface of the rotor by applying a coating having a friction coefficient lower than that of the iron processing surface. Even if the gap between them is small, the rotor can be easily removed. Further, it is more preferable to reduce the cost and man-hours by coating the inner peripheral surface of the auxiliary yoke without coating the outer peripheral surface of the rotor. This is because one auxiliary yoke can be used for manufacturing a plurality of motors.

  In the motor magnetizing method according to an embodiment, when the rotor, the magnetizer, and the auxiliary yoke are disposed at the magnetizing position, or when the magnetizer and the rotor are separated after the magnetizing, The rotor is guided by a guide.

  According to the above embodiment, when the rotor, the magnetizer, and the auxiliary yoke are arranged at the position at the time of magnetization, or when the magnetizer and the rotor are separated after magnetization, the rotor is guided by the guide ( In particular, it is possible to improve workability while reliably preventing contact between the magnet) and the surface facing the air gap.

  As is clear from the above, according to the magnetizing method of the motor of the present invention, when magnetizing the rotor in a state where the permanent magnet and the back yoke are combined, a motor having a large magnetizing effect with a small magnetizing current can be obtained. A magnetization method can be realized.

  Further, according to the magnetizing method of the motor of one embodiment, the gap length between the back yoke and the auxiliary yoke of the rotor is made smaller than the gap length between the magnetizer and the rotor. The rotor can be fixed by the auxiliary yoke while preventing damage to the rotor due to contact with the rotor.

  Further, according to the magnetizing method of the motor according to the embodiment, the rotor is prevented from rotating by the rotation preventing means provided on the auxiliary yoke side, so that the position of the rotor is fixed and the magnetization is reliably performed. Can do.

  Further, according to the magnetizing method of the motor of one embodiment, good motor characteristics can be obtained because the back yoke of the rotor is not magnetically saturated when assembled as a motor. Furthermore, since the back yoke has no leakage magnetic flux or is sufficiently small, the rotor and the auxiliary yoke can be easily separated after magnetization.

  Further, according to the magnetizing method of the motor of one embodiment, the surface of the magnetized yoke portion of the magnetizer facing the permanent magnet of the magnetic material is made narrower than the magnetic pole area of the permanent magnet, thereby The magnetic flux is gathered in the direction to increase the gap magnetic flux density, and the surface facing the permanent magnet of the auxiliary yoke is made wider than the magnetic pole area of the permanent magnet, so that the high magnetic flux density at the time of magnetization is dispersed by the auxiliary yoke and magnetized. The effect of lowering the resistance can be enhanced and the magnetization strength of the rotor can be further improved.

  According to the magnetizing method of the motor of one embodiment, the gap between the magnetizer and the rotor is fixed by fixing and positioning the rotor with the auxiliary yoke whose relative position to the magnetizer is fixed. The relative position of the rotor with respect to the magnetizer can be determined while ensuring.

  In addition, according to the magnetizing method of the motor according to the embodiment, a repulsive force is generated between the magnetizer and the rotor by causing a current that causes the magnetic pole to be opposite to that at the time of magnetization to flow in the magnetizing coil of the magnetizer. Works, the magnetizer and the rotor can be easily separated, and workability is improved.

  Further, according to the magnetizing method of the motor of one embodiment, the stator arranged with the rotor and the air gap spaced apart also serves as a magnetizer, so that it is not necessary to remove the magnetizer after magnetizing, and the process is performed. It can be simplified.

  Further, according to the magnetizing method of the motor according to the embodiment, the stator and the rotor to be opposed to each other are arranged so as to be opposed to the rotor and the air gap is a plane perpendicular to the rotation axis to which the rotor is fixed. In this axial gap motor, even if the rotor is magnetized in a state where the permanent magnet and the back yoke are combined by applying this magnetizing method, a large magnetizing effect can be obtained with a small magnetizing current. .

  According to the magnetizing method of the motor according to the embodiment, the outer rotor having a configuration in which the outer peripheral surface of the stator disposed on the inner side of the substantially cylindrical rotor and the inner peripheral surface of the rotor face each other with an air gap therebetween. In a type motor, even when the rotor is magnetized in a state where the permanent magnet and the back yoke are combined by applying the magnetizing method of the motor, a large magnetizing effect can be obtained with a small magnetizing current.

  Also, according to the magnetizing method of the motor of one embodiment, the rotor is coated with at least one of the inner peripheral surface of the auxiliary yoke or the outer peripheral surface of the rotor in advance, so that the friction coefficient is lower than that of the iron processed surface. Even if the gap between the back yoke and the auxiliary yoke is small, the rotor can be easily removed.In particular, by coating the inner peripheral surface of the auxiliary yoke without coating the outer peripheral surface of the rotor, the cost and man-hours can be reduced. Can be reduced.

  According to the magnetizing method of the motor of one embodiment, the rotor is guided when the rotor, the magnetizer, and the auxiliary yoke are arranged at the magnetizing position, or when the magnetizer and the rotor are separated after the magnetizing. Thus, the workability can be improved while reliably preventing contact between the rotor and the magnetizer.

  The motor magnetizing method of the present invention will be described in detail below with reference to the illustrated embodiments.

[First Embodiment]
FIG. 1 is a perspective view of an outer rotor and an external magnetizing device of an outer rotor type motor that is magnetized by the motor magnetizing method according to the first embodiment of the present invention, wherein 6 is an outer rotor, and 40 is the outer rotor 6. 1 is an external magnetizing device as an example of a magnetizer for magnetizing a magnet. This outer rotor type motor has a configuration in which an outer peripheral surface of a stator (not shown) disposed inside the substantially cylindrical outer rotor 6 and an inner peripheral surface of the outer rotor 6 face each other with an air gap therebetween. .

  As shown in FIG. 1, the outer rotor 6 is provided with a plurality of insertion holes 15 a in the axial direction at predetermined intervals in the circumferential direction in a cylindrical rotor core 15. Plate-like permanent magnets 14 made of a magnetic material are inserted into the plurality of insertion holes 15a of the rotor core 15, respectively. An annular region radially outward from the permanent magnet 14 of the rotor core 15 corresponds to a back yoke.

  The external magnetizing device 40 includes a magnetizing yoke portion 42 made of a magnetic material, and a cylindrical outer peripheral portion 43 that surrounds the entire circumference of the magnetizing yoke portion 42 with a predetermined interval in the radial direction. Yes. A DC power source 51 is connected to a connection portion 50 provided on the outer peripheral portion 43. The direct current power source 51 energizes the magnetizing coil of the magnetizing yoke portion 42.

  FIG. 2 is a longitudinal cross-sectional view showing a state in which the outer rotor 6 shown in FIG. 1 is mounted on the external magnetizing device 40. One end of the cylindrical outer rotor 6 is fixed to the outer edge side of the rotor support portion 5, and the rotor The rotary shaft 3 is inserted and fixed to a boss 7 provided at the center of the support portion 5.

  In the external magnetizing device 40, a cylindrical magnetizing yoke portion 42 is disposed on the base portion 41. A guide hole 40 a is provided in part of the magnetized yoke portion 42 and the base portion 41 along the central axis of the magnetized yoke portion 42. In the external magnetizing device 40, an auxiliary yoke 44 made of a magnetic material is disposed on the inner peripheral side of a cylindrical outer peripheral portion 43 that surrounds the outer peripheral side of the magnetized yoke portion 42. The base 41, the magnetized yoke 42 and the auxiliary yoke 44 are integrally formed by resin molding.

  As shown in FIG. 2, with the auxiliary yoke 44 disposed so as to surround the outer periphery of the outer rotor 6, current is passed through the magnetizing coil 45 of the external magnetizing device 40 to magnetize the outer rotor 6. By dispersing the high magnetic flux density at the time of magnetization by the auxiliary yoke 44 and relaxing the magnetic saturation, the magnetic resistance can be lowered, and the necessary magnetizing current can be reduced.

  According to the magnetizing method of the motor, in the outer rotor type motor, even if the outer rotor 6 is magnetized in a state where the permanent magnet 14 and the rotor core 15 are combined, a motor with a large magnetizing effect can be obtained with a small magnetizing current. Can be realized.

Further, a gap length L1 between the outer circumference of the outer rotor 6 and the inner circumference of the auxiliary yoke 44, and a gap length between the outer circumference of the magnetized yoke portion 42 of the external magnetizing device 40 and the inner circumference of the outer rotor 6 are described. L2 is
L1 <L2
Thus, the outer rotor 6 can be fixed by the auxiliary yoke 44 while preventing the outer rotor 6 from being damaged by the contact between the external magnetizing device 40 and the outer rotor 6. . This is because the back yoke is stronger than the air gap side of the rotor.

  Further, by making the surface of the magnetizing yoke portion 42 of the external magnetizing device 40 facing the permanent magnet 14 smaller than the magnetic pole area of the permanent magnet 14, the magnetic flux is collected in the center direction of the magnetic pole surface, and the gap magnetic flux density is increased. In addition, the surface of the auxiliary yoke 44 facing the permanent magnet 14 is made wider than the magnetic pole area of the permanent magnet 14, thereby increasing the effect of lowering the magnetic resistance by dispersing the high magnetic flux density during magnetization by the auxiliary yoke 44. Thus, the strength of magnetization of the outer rotor 6 can be further improved. In addition, with such magnetization, the magnetic flux is concentrated on the air gap side of the permanent magnet, and the opposite is to disperse the magnetic flux. Therefore, the magnetic path of the back yoke can be shortened.

  Further, the outer rotor 6 is fixed and positioned by the auxiliary yoke 44 whose relative position with the external magnetizing device 40 is fixed, thereby ensuring a gap between the external magnetizing device 40 and the outer rotor 6. Meanwhile, the relative position of the outer rotor 6 with respect to the external magnetizing device 40 can be determined.

  In addition, a repulsive force is exerted between the external magnetizing device 40 and the outer rotor 6 by causing a current that causes the magnetic pole to be opposite to that at the time of magnetization to flow in the magnetizing coil 45 of the external magnetizing device 40. The outer rotor 6 can be easily separated from the magnetizing device 40, and workability is improved. In this case, the current value must be sufficiently smaller than the magnetizing current so that the permanent magnet does not demagnetize. Specifically, a current value at the time of motor operation is sufficient.

  Further, a coating having a lower friction coefficient than that of the iron processed surface is applied to at least one of the inner peripheral surface of the auxiliary yoke 44 and the outer peripheral surface of the outer rotor 6 in advance, so that the back yoke of the outer rotor 6 and the auxiliary yoke 44 The outer rotor 6 can be easily pulled out even if the gap between them is small. In particular, by coating the inner peripheral surface of the auxiliary yoke 44 without coating the outer peripheral surface of the outer rotor 6, costs and man-hours can be reduced. This is because one auxiliary yoke can be used for manufacturing a plurality of motors.

  Further, when the outer rotor 6, the external magnetizing device 40 and the auxiliary yoke 44 are disposed at the magnetizing position, or when the external magnetizing device 40 and the outer rotor 6 are separated after magnetizing, the outer rotor 6 is guided ( By guiding through the guide holes 40a) provided in part of the magnetized yoke portion 42 and the base portion 41, the workability can be improved while preventing the outer rotor 6 and the external magnetizing device 40 from contacting each other.

[Second Embodiment]
FIG. 3 is a perspective view of an outer rotor and an external magnetizing device that are magnetized by the motor magnetizing method according to the second embodiment of the present invention, where 106 is an outer rotor, and 140 is for magnetizing the outer rotor 106. The external magnetizing device.

  As shown in FIG. 3, the outer rotor 106 is provided with a plurality of insertion holes 115a in the axial direction in the cylindrical rotor core 115 at predetermined intervals in the circumferential direction. Plate-like permanent magnets 114 made of a magnetic material are inserted into the plurality of insertion holes 115a of the rotor core 115, respectively. An annular region radially outward from the permanent magnet 114 of the rotor core 115 corresponds to a back yoke.

  The external magnetizing device 140 includes a magnetizing yoke portion 142 made of a magnetic material, and a cylindrical outer peripheral portion 143 that surrounds the entire circumference of the magnetizing yoke portion 142 at a predetermined interval in the radial direction. Yes. A DC power source 151 is connected to a connection portion 150 provided on the outer peripheral portion 143. The DC power supply 151 supplies current to the magnetizing coil of the magnetizing yoke part 142.

  The outer rotor 106 according to the second embodiment has the same configuration as that of the outer rotor 6 according to the first embodiment except for the notch 116 on the outer periphery of the rotor core 115. The external magnetizing device 140 according to the second embodiment has the same configuration as the external magnetizing device 40 according to the first embodiment except for the flat portion 146 inside the outer peripheral portion 43.

  The motor magnetizing method of the second embodiment has the same effect as the motor magnetizing method of the first embodiment.

  4 is a cross-sectional view showing a state in which the outer rotor 106 shown in FIG. 3 is attached to the external magnetizing device 140, and a plane portion as an example of rotation preventing means on the auxiliary yoke 144 side of the external magnetizing device 140. 146 is positioned by a notch 116 on the outer periphery of the rotor core 115. The cutout portions may be equally spaced as long as they are a few of the number of poles, but the nonuniform spacing uniquely determines the positional relationship between the magnetizing device 140 and the rotor magnet. That is, it is possible to prevent a mounting position error of the magnetizing device 140. 3 and 4, the notch 116 and the flat part 146 are shown deformed and enlarged, but the notch 116 and the flat part 146 have such a size that the back yoke is not saturated when the motor is operating. It is desirable to do.

  The flat portion 146 of the auxiliary yoke 144 prevents the outer rotor 106 from rotating.

  The magnetizing method of the motor of the second embodiment has the same effect as the motor magnetizing method of the first embodiment, and the outer rotor 106 is provided by the flat portion 146 provided on the auxiliary yoke 144 side as a rotation preventing means. By preventing the rotation, the position of the outer rotor 106 can be fixed and the magnetization can be performed reliably. Further, when this motor is operated inside the device, it can also function as a passage for ventilation or oil circulation in the flat portion 146.

[Third Embodiment]
FIG. 5 shows a longitudinal sectional view of a main part of a scroll compressor using an outer rotor type motor that is magnetized by the motor magnetizing method of the third embodiment of the present invention. The scroll compressor includes a main body portion 201, a cylindrical support portion 202 extending from the main body portion 201, a rotary shaft 203 inserted into the support portion 202, and a stator fixed to the outer periphery of the support portion 202. 204, a cylindrical outer rotor 206 that is fixed to the distal end side of the rotating shaft 203 protruding from the support portion 202 via the rotor support portion 205 and is disposed so as to surround the outer peripheral side of the stator 204, and the support portion A rotary bearing 208 provided on the inner side of 202 and on the main body 201 side, and a sub-bearing 209 provided on a position that is not continuous with the rotary bearing 208 inside the support unit 201 are provided. Each bearing is provided with an oil supply hole for supplying oil from the shaft. In this scroll compressor, the main body portion 201 and the support portion 202 are integrally formed.

  In the outer rotor 206, a plurality of plate-like permanent magnets 214 are embedded in the rotor core 215 made of a soft magnetic material such as iron at a predetermined interval in the circumferential direction. As a result, N-pole and S-pole magnetic poles appear alternately on the inner circumferential surface of the outer rotor 206 in the circumferential direction. An annular region radially outward from the permanent magnet 214 of the rotor core 215 corresponds to a back yoke.

  A compression unit 210 is disposed above the main body unit 201. The compression unit 210 includes a fixed scroll 211 fixed on the upper side of the main body 201 and a turning scroll 212 that is superimposed on the fixed scroll 211 and supported by the main body 201 so as to be revolved. The orbiting scroll 212 has an end plate 212a and a spiral wrap (not shown) provided on the end plate 212a. The spiral wrap of the orbiting scroll 212 is meshed with the spiral wrap provided on the fixed scroll 211 to form a plurality of compression chambers between the fixed scroll 211 and the orbiting scroll 212.

  Further, a boss 213 is erected on the lower side of the end plate 212 a of the orbiting scroll 212, and an eccentric shaft (not shown) fitted inside the boss 213 is provided on the upper end side of the rotary shaft 203.

  An annular member 245 is provided on the outer peripheral side of the lower end of the main body 201, and a cylindrical auxiliary yoke 244 having one end fixed on the outer peripheral side of the annular member 245 is disposed.

  As shown in FIG. 5, with the auxiliary yoke 244 arranged so as to surround the outer periphery of the outer rotor 206, by magnetizing the outer rotor 206 by passing a current through the stator 204 as an external magnetizing device, A high magnetic flux density at the time of magnetization can be dispersed by the auxiliary yoke 244 to reduce the magnetic resistance, and a necessary magnetizing current can be reduced.

  The motor magnetizing method of the third embodiment has the same effect as the motor magnetizing method of the first embodiment.

Further, a gap length L11 between the outer circumference of the outer rotor 206 and the inner circumference of the auxiliary yoke 244, and a gap length L12 between the outer circumference of the stator 204 as an external magnetizing device and the inner circumference of the outer rotor 206 are:
L11 <L12
Thus, the outer rotor 206 can be fixed by the auxiliary yoke 244 while preventing the outer rotor 206 from being damaged by the contact between the stator 204 and the outer rotor 206.

  In addition, since the stator 204 arranged with an air gap spaced apart from the outer rotor 206 also serves as a magnetizer, it is not necessary to remove the magnetizer after magnetization, and the process can be simplified. Further, if the back yoke is not magnetically saturated, the auxiliary yoke 244 has little leakage magnetic flux and can be easily removed without attracting force. In particular, when this motor is housed in a compression container, it is effective in a case where there is not enough space for the auxiliary yoke.

[Fourth Embodiment]
FIG. 6 is a longitudinal sectional view of an essential part of a scroll compressor using an outer rotor type motor that is magnetized by the motor magnetizing method of the fourth embodiment of the present invention. The compressor using the outer rotor type motor of the fourth embodiment has the same configuration as the scroll compressor using the outer rotor type motor of the third embodiment except for the method of fixing the auxiliary yoke. The same reference numerals are given to the constituent parts and the description thereof will be omitted.

  As shown in FIG. 6, the main part of the scroll compressor including the main body 201 is accommodated in a casing 345, and a cylindrical auxiliary yoke 344 is fixed to the inner periphery of the casing 345.

  The motor magnetizing method of the fourth embodiment has the same effect as the motor magnetizing method of the third embodiment. Furthermore, the rotor can be kept concentric with the inner periphery of the casing 345.

[Fifth Embodiment]
FIG. 7 is a longitudinal sectional view of an essential part of an axial gap type motor which is magnetized by the motor magnetizing method of the fifth embodiment of the present invention.

  As shown in FIG. 7, the axial gap type motor of the fifth embodiment includes a stator 421, a rotor 431 disposed on the stator 421 via an air gap, and a rotor 431 that is fixed to the rotor 431. The rotating shaft 403 is transmitted to the load, and has a rotating shaft 403 extending from the rotor 431 and rotatably supported by a bearing (not shown). The rotor 431 rotates around the axis of the rotating shaft 403 that is a predetermined rotating shaft.

  The stator 421 includes a stator core 424 attached to the inside of the casing 410 by, for example, press fitting or shrink fitting, and a coil 423 attached to the stator core 424.

  The stator core 424 has an annular back yoke 424a disposed so as to be substantially orthogonal to the rotating shaft 403, and a tooth 424b provided upright on the rotor 431 side of the back yoke 424a. Further, the inner diameter of the back yoke 424a of the stator core 424 may be large enough not to contact the rotating shaft 403, or a bearing may be provided.

  The teeth 424 b of the stator core 424 extend toward the rotor 431 along the axial direction of the rotating shaft 403, and a plurality of teeth are provided around the rotating shaft 403. Coils 423 are wound around the axes of the teeth 424b. The coil 423 is excited to generate an axial magnetic flux in the teeth 424b.

  The coil 423 is arranged in, for example, the U phase, V phase, W phase, U phase, V phase, and W phase in the circumferential direction, and each of the three phases is star-connected, and current is supplied from the inverter. Here, the teeth 424b are made of a powder magnetic core, and a part of the teeth 424b is embedded in a recess 424c provided in a back yoke 424a formed by laminating electromagnetic steel plates substantially orthogonal to the rotating shaft 403 in the axial direction. It is fixed in the state. Thereby, although the teeth 424b are independent of each other, they are connected via the back yoke 424a. As a means for fixing the teeth 424b, press-fitting, adhesion, or the like is used. An example of the dust core is a dust core. The electromagnetic steel plate is called a so-called silicon steel plate, but may be a thin plate such as amorphous or permalloy. These are selected according to the required characteristics.

  The depth of the recess 424c of the back yoke 424a is desirably in a range where the magnetic flux has an axial component. For example, if the magnetic flux density of the back yoke 424a is substantially close to the saturation region, it is desirable that the depth of the recess 424c is approximately equal to the thickness of the back yoke 424a or the teeth 424b are penetrated. In general, the depth of the concave portion 424c needs to be more than half of the thickness of the back yoke 424a. Then, since the magnetic flux reaches the back yoke 424a made of the laminated steel plate after the magnetic flux reaches a sufficient depth through the dust core, the magnetic resistance is low and the iron loss is also reduced. In addition, the magnetic flux passing through the back yoke 424a flows into the teeth 424b, and the magnetic flux passes through the teeth 424b and flows into the adjacent teeth 4b. The latter passes through a back yoke 424a made of a laminated steel plate. Note that the back yoke 424a and the teeth 424b may be formed of a dust core.

  The rotor 431 includes an annular back yoke 434 attached to the rotary shaft 403, a permanent magnet 433 provided on one surface of the back yoke 434 on the stator 421 side, and a permanent magnet 433 in cooperation with the back yoke 434. A rotor plate 435 is sandwiched. The rotor plate 435 is not essential.

  The back yoke 434 of the rotor 431 is made of a magnetic material. The permanent magnet 433 has different magnetic poles alternately in the circumferential direction of the rotating shaft 403, and generates magnetic flux in the direction along the rotating shaft 403.

  An annular auxiliary yoke 444 is arranged at a predetermined distance from the back yoke 434 in the casing 401 and on the opposite side of the back yoke 434 from the permanent magnet 433. The auxiliary yoke 444 is attached to the inside of the casing 410 by, for example, press fitting or shrink fitting.

  According to the above magnetizing method of the motor, the stator 421 and the rotor 431 that are arranged with an air gap spaced apart from the rotor 431 have a plane that is perpendicular to the rotating shaft 403 to which the rotor 431 is fixed. In an axial gap motor, it is possible to realize a magnetizing method for a motor that can obtain a large magnetizing effect with a small magnetizing current even if the rotor 431 is magnetized in a state where the permanent magnet 433 and the back yoke 434 are combined. .

  Further, the surface of the stator 421 facing the permanent magnet 433 of the teeth 424b (area area corresponding to L21) is made narrower than the magnetic pole area of the permanent magnet 433 (area area corresponding to L22), whereby the center of the magnetic pole face The magnetic flux is gathered in the direction to increase the gap magnetic flux density, and the surface of the auxiliary yoke 444 facing the permanent magnet 433 (region area corresponding to L23) is wider than the magnetic pole area of the permanent magnet 433 (region area corresponding to L22). By doing so, the effect of lowering the magnetic resistance by dispersing the high magnetic flux density at the time of magnetization by the auxiliary yoke 444 can be enhanced, and the strength of magnetization of the rotor 431 can be further improved.

  In addition, since the stator 421 arranged with the air gap away from the rotor 431 also serves as a magnetizer, it is not necessary to remove the magnetizer after magnetization, and the process can be simplified.

[Sixth Embodiment]
FIG. 8 is a longitudinal sectional view of a main part of an axial gap type motor that is magnetized by the motor magnetizing method according to the sixth embodiment of the present invention and an external magnetizing apparatus.

  As shown in FIG. 8, the rotor 531 includes an annular back yoke 534 attached to the rotation shaft 503, a permanent magnet 533 provided on one surface of the back yoke 534, and a permanent magnet in cooperation with the back yoke 534. A rotor plate 535 sandwiching 533 is provided.

  The external magnetizing device 540 includes a disk-shaped back yoke 524 disposed so as to be substantially orthogonal to the rotation shaft 403, and teeth as an example of a magnetizing yoke portion standing on the back yoke 524. 542 and a magnetized coil 545 attached to the tooth 542. A bottomed circular hole 540 a is provided in the approximate center of the back yoke 524.

  A plurality of positioning pins 510 (only two are shown in FIG. 8) are provided upright in the vicinity of the outer peripheral edge of the back yoke 524. The positioning pins 510 are arranged on the back yoke 524 at different pitches in the circumferential direction of the back yoke 524.

  On the external magnetizing device 540, the lower end of the rotating shaft 503 is inserted into the circular hole 540a of the back yoke 524, and a predetermined air gap is formed between the tip of the teeth 542 of the external magnetizing device 540 and the rotor plate 535. The rotor 531 is arranged.

  An auxiliary yoke 544 is disposed on the opposite side of the back yoke 434 from the permanent magnet 533 with a predetermined distance from the back yoke 534. The auxiliary yoke 544 is positioned by inserting an upper end portion of a positioning pin 510 erected on the back yoke 524 of the external magnetizing device 540 into the insertion hole 544a.

  According to the magnetizing method of the motor, in the axial gap type motor, even if the rotor 531 is magnetized in a state where the permanent magnet 533 and the back yoke 534 are combined, a motor with a large magnetizing effect can be obtained with a small magnetizing current. Can be realized.

  Further, the surface of the external magnetizing device 540 facing the permanent magnet 533 of the tooth 542 (region area corresponding to L31) is made narrower than the magnetic pole area of the permanent magnet 533 (region area corresponding to L32), whereby the magnetic pole The magnetic flux is collected in the center direction of the surface to increase the gap magnetic flux density, and the surface of the auxiliary yoke 544 facing the permanent magnet 533 (region area corresponding to L33) is the magnetic pole area of the permanent magnet 533 (region area corresponding to L32). By making the width wider, the effect of lowering the magnetic resistance by dispersing the high magnetic flux density at the time of magnetization by the auxiliary yoke 544 can be enhanced, and the strength of magnetization of the rotor 531 can be further improved.

[Seventh Embodiment]
FIG. 9 is a longitudinal sectional view of an essential part of an axial gap type motor that is magnetized by the magnetizing method of the motor according to the seventh embodiment of the present invention and an external magnetizing device. The main part of the axial gap type motor and the external magnetizing device of the seventh embodiment have the same configuration as that of the sixth embodiment except for the rotor positioning portion, and the same components are denoted by the same reference numerals. Description is omitted.

  As shown in FIG. 9, an annular member 511 as an example of a rotation preventing means positioned by a positioning pin 510 is externally fitted on the outer peripheral side of the back yoke 534. The annular member 511 is provided on the outer peripheral side and the lower side of the auxiliary yoke 544.

  FIG. 10 is a view of the main part of the axial gap type motor shown in FIG. 9 and the annular member 511 viewed from the lower side, and two linear lines that are substantially parallel to each other are located at opposite positions on the outer periphery of the rotor plate 535. A notch 535a is provided. In addition, two linear positioning portions 511a that are substantially parallel to each other are provided at opposing positions on the inner periphery of the annular member 511.

  The rotor plate 535 is fitted into the annular member 511 so that the positioning portion 511a of the annular member 511 faces the notch 535a of the rotor plate 535.

  According to the magnetizing method of the motor, in the axial gap type motor, even if the rotor 531 is magnetized in a state where the permanent magnet 533 and the back yoke 534 are combined, a motor with a large magnetizing effect can be obtained with a small magnetizing current. Can be realized.

  By preventing the rotation of the rotor 531 by the annular member 51 as the rotation preventing means provided on the auxiliary yoke 544 side, the position of the rotor 531 can be fixed and the magnetization can be reliably performed.

  Further, the surface (area area corresponding to L41) of the magnetizing yoke portion 142 of the external magnetizing device 540 facing the permanent magnet 533 is made smaller than the magnetic pole area (area area corresponding to L42) of the permanent magnet 533. Thus, the magnetic flux is gathered in the center direction of the magnetic pole surface to increase the gap magnetic flux density, and the surface (area area corresponding to L43) of the auxiliary yoke 544 facing the permanent magnet 533 corresponds to the magnetic pole area (L42) of the permanent magnet 533. By making the area larger than the area, the effect of lowering the magnetic resistance by dispersing the high magnetic flux density at the time of magnetization by the auxiliary yoke 544 can be enhanced, and the strength of magnetization of the rotor 531 can be further improved.

[Eighth Embodiment]
FIG. 11 is a cross-sectional view of an essential part of an axial gap type motor that is magnetized by the motor magnetizing method according to the eighth embodiment of the present invention.

  As shown in FIG. 11, the back yoke 634 of the rotor 631 has salient pole portions 634 a made of an iron core between the permanent magnets 633. Furthermore, a plate-like rotor plate 632 is further provided on the extension line in the axial direction of the permanent magnet 633 and the salient pole portion 634a. A space is provided between the permanent magnet 633 and the salient pole portion 634a so that the magnetic flux is not short-circuited, and the rotor plate 632 is also a region facing the region between the permanent magnet 633 and the salient pole portion 634a. Is provided with a slit 632a. The permanent magnet 633 and the rotor plate 632 are fixed to the back yoke 634 by adhesion or press fitting.

  Note that the salient pole portion 634a, the back yoke 634, and the rotor plate 632 are all made of a soft magnetic material, for example, iron. In particular, the rotor plate 632 is made of a material having a small iron loss (such as a dust core) in all directions. desirable.

  An auxiliary yoke 6474 is disposed on the opposite side of the stator 621 with respect to the rotor 631.

  According to the magnetizing method of the motor, in the axial gap type motor, even if the rotor 631 is magnetized in a state where the permanent magnet 633 and the back yoke 634 are combined, a motor with a large magnetizing effect can be obtained with a small magnetizing current. Can be realized.

  Further, since the stator 621 arranged with a gap between the rotor 631 and the air gap also serves as a magnetizer, it is not necessary to remove the magnetizer after magnetization, and the process can be simplified.

  In the first to eighth embodiments, good motor characteristics can be obtained because the back yoke of the rotor is not magnetically saturated when assembled as a motor.

  In the third and fourth embodiments, the magnetizing method of the outer rotor type motor used in the compressor has been described. However, the magnetizing method of the motor of the present invention is not limited to the compressor, and drives other driving mechanisms. You may apply to a motor. Moreover, you may use the axial gap type motor using the magnetizing method of the motor of 5th-8th embodiment for a compressor.

  Moreover, although the said 1st-4th embodiment demonstrated the magnetization method of the outer rotor type | mold motor, and the 5th-8th embodiment demonstrated the magnetization method of the axial gap type | mold motor, the motor of this invention This magnetizing method may be applied to a motor having another configuration including a rotor having a permanent magnet and a back yoke, and having a space on at least the back yoke opposite to the permanent magnet. In the axial gap type motor, the magnetizing device (except when the stator also serves as the stator) and the rotor may be in close contact with each other. In that case, a mechanism capable of maintaining a close contact state at the time of magnetization is necessary.

  Further, the description has been given of the rotor having a configuration in which the permanent magnets are all embedded in the rotor core. However, the same applies to a configuration in which the permanent magnets are arranged on the gap surface of the rotor.

FIG. 1 is a perspective view of an outer rotor and an external magnetizing device that are magnetized by the motor magnetizing method of the first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the outer rotor mounted on an external magnetizing device. FIG. 3 is a perspective view of an outer rotor and an external magnetizing device that are magnetized by the motor magnetizing method of the second embodiment of the present invention. FIG. 4 is a cross-sectional view of the outer rotor mounted on an external magnetizing device. FIG. 5 is a longitudinal sectional view of an essential part of a compressor using an outer rotor type motor that is magnetized by the motor magnetization method of the third embodiment of the present invention. FIG. 6 is a longitudinal sectional view of an essential part of a compressor using an outer rotor type motor that is magnetized by the motor magnetizing method of the fourth embodiment of the present invention. FIG. 7 is a longitudinal sectional view of an essential part of an axial gap type motor which is magnetized by the motor magnetizing method of the fifth embodiment of the present invention. FIG. 8 is a longitudinal sectional view of an essential part of an axial gap type motor which is magnetized by the motor magnetizing method of the sixth embodiment of the present invention. FIG. 9 is a longitudinal sectional view of an essential part of an axial gap type motor that is magnetized by the magnetizing method of the motor according to the seventh embodiment of the present invention and an external magnetizing device. FIG. 10 is a view of the main part and the rotor positioning part of the axial gap type motor shown in FIG. 9 as viewed from below. FIG. 11 is a cross-sectional view of an essential part of an axial gap type motor that is magnetized by the motor magnetizing method according to the eighth embodiment of the present invention.

Explanation of symbols

3, 203, 403, 503 ... Rotating shaft 5, 205 ... Rotor support 6, 106, 206 ... Outer rotor 7 ... Boss 14, 114, 214, 433, 533, 633 ... Permanent magnet 15, 115, 215 ... Rotor core 40 , 140, 540 ... external magnetizing device 42,142 ... magnetizing yoke part 43,143 ... peripheral part 44,244,344,444,544,644 ... auxiliary yoke 45 ... magnetizing coil 50,150 ... connecting part 51, 151 ... DC power supply 116 ... notch 146 ... plane part 201 ... main body part 202 ... support part 204,421,621 ... stator 208 ... rotary bearing 209 ... sub-bearing 210 ... compression part 211 ... fixed scroll 212 ... orbiting scroll 212a ... End plate 213 ... Boss 245 ... Ring member 345 ... Casing 410 ... Casing 423 ... Coil 424 ... Stator core 424a ... Bar Cook yoke 424b ... Teeth 431, 531, 631 ... Rotor 434, 534, 634 ... Back yoke 435, 535, 632 ... Rotor plate 510 ... Positioning pin 511 ... Ring member 524 ... Back yoke 542 ... Teeth 545 ... Magnetized coil

Claims (12)

A rotor (6, 106, 206, 431, 531, 631) having a permanent magnet (14, 114, 214, 433, 533, 633) and a back yoke is provided, and at least permanent with respect to the back yoke when magnetized. A method of magnetizing a motor having a space on the opposite side of a magnet (14, 114, 214, 433, 533, 633),
On the rotor (6,106,206,431,531,631) side of the permanent magnet (14,114,214,433,533,633) side, the rotor (6,106,206,431,531,631) The magnetizers (40, 140, 204, 421, 540, 621) are arranged with a gap between them or in close contact with each other,
Auxiliary yokes (44, 244, 344, 444, 544, 644) made of a magnetic material are placed in the space opposite to the permanent magnets (14, 114, 214, 433, 533, 633) with respect to the back yoke. Place and
A method for magnetizing a motor, characterized in that the rotor (6, 106, 206, 431, 531, 631) is magnetized by the magnetizer (40, 140, 204, 421, 540, 621). The method of magnetizing a motor according to claim 1.
The gap length between the back yoke of the rotor (6, 106, 206) and the auxiliary yoke (44, 244, 344) is determined by the magnetizer (40, 140, 204) and the rotor (6, 106, 206). 206), the magnetizing method for the motor. In the magnetizing method of the motor according to claim 1 or 2,
A motor characterized in that the auxiliary yoke (44,544) has rotation preventing means (146,511) provided on the auxiliary yoke (44,544) side to prevent the rotation of the rotor (106,531). Magnetization method. In the magnetizing method of the motor according to any one of claims 1 to 3,
A method of magnetizing a motor, wherein the back yoke of the rotor (6, 106, 206, 431, 531, 631) is not magnetically saturated when assembled as a motor. In the magnetizing method of the motor according to any one of claims 1 to 4,
The surface of the magnetized yoke portion of the magnetizer (40, 140, 421, 540) facing the permanent magnet (14, 114, 433, 533) of the magnetic material is the permanent magnet (14, 114, 433, 533). The surface of the auxiliary yoke (44,444,544) facing the permanent magnet (14,114,433,533) is smaller than the magnetic pole area of the permanent magnet (14,114,433,533). A method of magnetizing a motor, characterized in that it is wider than a magnetic pole area. In the magnetizing method of the motor according to any one of claims 1 to 5,
The auxiliary yoke (44, 244, 344, 444, 544, 644) has a relative position with the magnetizer (40, 140, 204, 421, 540, 621) determined. Magnetization method. In the magnetizing method of the motor according to any one of claims 1 to 6,
After magnetization, the magnetic poles are opposite to those at the time of magnetization, and the magnetizers (40, 140, 540) are passed through a magnetizing coil of the magnetizer (40, 140, 540) with a current sufficiently smaller than that at the time of magnetization. ) And the rotor (6, 106, 531) are separated from each other. In the magnetizing method of the motor according to any one of claims 1 to 6,
A magnetizing method for a motor, wherein the magnetizers (204, 421, 621) serve as the rotors (206, 431, 631) and a stator arranged with an air gap therebetween. In the magnetizing method of the motor according to any one of claims 1 to 7,
The rotor (431, 531, 631) and the stator (421, 621) disposed with an air gap therebetween and the surfaces to be opposed to the rotor (431, 531, 631) are arranged to face the rotor (431, 531, 631). Is a plane orthogonal to the fixed rotation axis (403, 503). In the magnetizing method of the motor according to any one of claims 1 to 7,
The rotor (6, 106, 206) has a substantially cylindrical shape,
A stator (204) is disposed inside the rotor (6, 106, 206),
A method for magnetizing a motor, characterized in that the outer peripheral surface of the stator (204) and the inner peripheral surface of the rotor (6, 106, 206) face each other with an air gap therebetween. In the magnetizing method of the motor according to claim 10,
At least one of the inner peripheral surface of the auxiliary yoke (44,244) or the outer peripheral surface of the rotor (6,106,206) is preliminarily coated with a coating whose friction coefficient is lower than that of the iron processed surface. The method of magnetizing the motor. The method of magnetizing a motor according to claim 10 or 11,
When the rotor (6, 106), the magnetizer (40, 140), and the auxiliary yoke (44) are arranged at the magnetizing position, or after magnetizing, the magnetizer (40, 140) and the rotor A method of magnetizing a motor, characterized in that the rotor (6, 106) is guided by a guide (40a) when releasing (6, 106).

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