CN113890290A - Magnetizing coil magnetic field regulation and control method - Google Patents
Magnetizing coil magnetic field regulation and control method Download PDFInfo
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- CN113890290A CN113890290A CN202111107545.9A CN202111107545A CN113890290A CN 113890290 A CN113890290 A CN 113890290A CN 202111107545 A CN202111107545 A CN 202111107545A CN 113890290 A CN113890290 A CN 113890290A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/003—Methods and devices for magnetising permanent magnets
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Abstract
The invention discloses a magnetizing coil magnetic field regulation and control method, which comprises the following steps: placing a magnetizing coil on a target magnetic pole in a rotor of a permanent magnet motor to be charged in a clinging manner; when the magnetizing field range generated by the magnetizing coil is overlapped with the adjacent magnetic poles positioned at the two sides of the target magnetic pole and the adjacent magnetic poles generate demagnetization, a conductor is additionally arranged around the magnetizing coil; enabling the conductor to generate a magnetic field opposite to the magnetizing magnetic field, and regulating and controlling the configuration of the magnetizing magnetic field by controlling the characteristics of the conductor, wherein the characteristics of the conductor comprise the position, the shape and the size of the conductor; each conductor is correspondingly arranged above other magnetic poles positioned at two sides of the target magnetic pole in a close way and is insulated from the other magnetic poles, so that the reverse magnetic field generated by each conductor weakens the non-magnetizing direction magnetic field of the adjacent magnetic pole. The position of the magnetizing magnetic field can be regulated and controlled only by additionally arranging the conductor around the magnetizing coil; the magnetizing requirements of motors with complex structures can be met by changing the positions, shapes and sizes of the conductors, and the universality is high.
Description
Technical Field
The invention belongs to the technical field of permanent magnet motor magnetization, and particularly relates to a method for regulating and controlling a magnetic field of a magnetizing coil.
Background
In the process of magnetizing the magnetic pole of the permanent magnet motor rotor by the magnetizing coil, the position shape (including parameters such as magnetic field size distribution, magnetic field direction and the like) of a generated magnetic field needs to be completely matched with the structure of the permanent magnet magnetic pole, otherwise, local unsaturated magnetization or local demagnetization of the magnetized magnetic pole can be caused.
The existing magnetic field configuration regulating and controlling method mainly changes parameters such as the shape, the size, the number of turns and the like of the magnetizing coil, but the magnetic field configuration regulating and controlling method by changing the coil parameters has some defects, for example, the gradient of the magnetic field configuration is insufficient; for some high field coils, complex coil structures cannot be employed for structural strength considerations; some special shapes cannot be realized in the coil winding process.
Therefore, the magnetizing requirement of the magnetic pole of the motor with a complex structure cannot be met only by adjusting the coil parameters. On the other hand, for magnetizing motors with different sizes and structures, magnetizing coils matched with the motors need to be specially designed, and the same magnetizing coil sometimes even cannot be suitable for motor magnetic poles with the same structure and similar sizes, so that the manufacturing, storage and other costs of the magnetizing coils are increased, the compatibility with a power supply system is poor, the coils need to be frequently replaced in the production process, and the production efficiency is low.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for regulating and controlling the magnetic field of a magnetizing coil, aiming at solving the problem that the existing method for regulating and controlling the magnetic field configuration of the magnetic field can not meet the magnetizing requirements of the magnetic poles of motors with certain complex structures only by regulating coil parameters; meanwhile, for magnetizing motors with different sizes and structures, magnetizing coils matched with the motors need to be specially designed, and the problem of poor universality exists.
In order to achieve the aim, the invention provides a magnetizing coil magnetic field regulating method, which comprises the following steps:
(1) placing a magnetizing coil on a target magnetic pole in a rotor of a permanent magnet motor to be charged in a clinging manner;
(2) when the magnetizing field range generated by the magnetizing coil is overlapped with the adjacent magnetic poles positioned at two sides of the target magnetic pole and demagnetization is generated on the adjacent magnetic poles, a conductor is additionally arranged around the magnetizing coil;
(3) enabling the conductor to generate a magnetic field opposite to the magnetizing magnetic field, and regulating and controlling the configuration of the magnetizing magnetic field by controlling the characteristics of the conductor, wherein the characteristics of the conductor comprise the position, the shape and the size of the conductor; each conductor is correspondingly arranged above other magnetic poles on two sides of the target magnetic pole in a close manner and is insulated from the other magnetic poles, so that the reverse magnetic field generated by each conductor weakens the non-magnetizing direction magnetic field of the adjacent magnetic pole.
In one embodiment, when the magnetizing coil generates a magnetizing magnetic field, the magnetizing magnetic field enables a skeleton in a rotor of the permanent magnet motor to be charged to generate eddy current; and the non-magnetizing direction magnetic field of the adjacent magnetic poles is a superposed magnetic field of the magnetizing magnetic field and an induced magnetic field generated by the skeleton eddy current in the area of one side, close to the target magnetic pole, of the adjacent magnetic pole.
In one embodiment, the distance between the conductor and the magnetizing coil is determined according to the weakening favorable influence of the non-magnetizing direction magnetic field on the side area of the adjacent magnetic pole close to the target magnetic pole and the unfavorable influence of the weakening favorable influence on the magnetizing direction magnetic field of the target magnetic pole.
In one embodiment, step (3) specifically includes:
connecting conductors around the magnetizing coil end to end, wherein the conductors generate induced eddy currents under the magnetizing magnetic field of the magnetizing coil; and regulating and controlling the configuration of the magnetizing magnetic field by controlling the characteristics of the conductor according to the reverse magnetic field generated by the induced eddy current.
In one embodiment, the conductors around the magnetizing coil are connected end to end by a cable.
In one embodiment, step (3) specifically includes:
current is introduced to each conductor around the magnetizing coil, so that each conductor generates the reverse magnetic field; and regulating and controlling the configuration of the magnetizing magnetic field by controlling the characteristics of the conductor according to the reverse magnetic field.
In one embodiment, the conductor is made of a material with good electrical conductivity.
In one embodiment, the conductor is a solid copper conductor.
In one embodiment, the solid copper conductor is secured to a reinforcing structure.
In one embodiment, the magnetizing coil is a racetrack coil.
Generally, compared with the prior art, the technical scheme of the invention has the following technical effects:
(1) according to the method for regulating and controlling the magnetic field of the magnetizing coil, the conductor is additionally arranged, the reverse magnetic field generated by the conductor is superposed with the magnetizing magnetic field generated by the magnetizing coil, and the position and the shape of the magnetizing magnetic field are regulated and controlled, so that the non-magnetizing direction magnetic field of the adjacent magnetic pole part is weakened, and the good magnetizing effect is ensured; meanwhile, the added conductor can reduce the magnetic field of the high-field area of the magnetizing coil, improve the stress distribution of the magnetic field coil and prolong the service life of the magnetizing coil.
(2) According to the method for regulating and controlling the magnetic field of the magnetizing coil, the shape of the conductor can be optimized, the magnetic field configuration which cannot be realized by coil winding can be generated, and the magnetizing requirements of motors with complex structures can be met; the shape of the conductor, the distance between the conductor and the magnetizing coil and the like are changed, so that the same magnetizing coil can generate various different magnetic field configurations, the universality of the magnetizing coil and the compatibility of the magnetizing coil and a magnetizing power supply can be effectively improved, and the use cost of the magnetizing coil is reduced.
Drawings
FIG. 1 is a diagram illustrating a distribution of a magnetizing field generated by a magnetizing coil in one embodiment;
FIG. 2 is a schematic diagram illustrating the distribution of the magnetizing field generated by the magnetizing coil and the induced field generated by the skeleton eddy current in adjacent pole regions in one embodiment;
FIG. 3 is a schematic diagram of an embodiment of an optimized magnetizing field configuration with additional conductors;
FIG. 4 is a flow diagram of a method for controlling a magnetic field of a magnetizing coil in one embodiment;
FIGS. 5a and 5b are schematic diagrams of the magnetic field distribution near the magnetizing coil without and after the conductor is added, respectively;
FIG. 6 is a schematic diagram of a coil for magnetizing a high-power permanent magnet motor commonly used in the art;
FIG. 7 is a schematic diagram of a permanent magnet motor rotor according to one embodiment;
FIG. 8 is a graph of pulsed magnetizing current in one embodiment;
FIG. 9 is a schematic diagram illustrating the distribution of the magnetization field of the target pole without the addition of the square copper bars in one embodiment;
FIG. 10 is a schematic view of the magnetic field distribution in the non-charging direction of adjacent poles without adding square copper bars in one embodiment;
FIG. 11 is a schematic view of the magnetic field distribution in the non-charging direction of adjacent poles after adding square copper bars in one embodiment;
FIG. 12 is a schematic diagram illustrating the magnetization field distribution of the target pole after adding the square copper bars in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The existing magnetic field configuration regulation and control method can not meet the magnetizing requirements of magnetic poles of motors with complex structures only by regulating coil parameters; meanwhile, for magnetizing motors with different sizes and structures, magnetizing coils matched with the motors need to be specially designed, and the problem of poor universality exists.
It should be noted that the magnetizing coil for the existing permanent magnet motor generally adopts a runway coil, and has a good magnetizing effect when magnetizing a magnetic steel embedded rotor with a large pole pitch. However, when a rotor with a smaller pole pitch is magnetized, the magnetizing field range generated by the magnetizing coil overlaps with adjacent magnetic poles on both sides of the target magnetic pole, which easily causes demagnetization in an adjacent magnetic pole region, as shown in fig. 1, and especially has a larger influence on demagnetization of a partial region (i.e., a partial region of an adjacent magnetic pole right below the magnetizing coil, hereinafter referred to as an adjacent magnetic pole portion) of the adjacent magnetic pole close to one side of the target magnetic pole (i.e., the current magnetic pole to be magnetized as shown in fig. 1).
The main reason for generating demagnetization by adjacent magnetic poles is that when a target magnetic pole is magnetized, a non-magnetizing directional magnetic field is generated in the adjacent magnetic pole area, and the non-magnetizing directional magnetic field causes the adjacent magnetic pole area to generate demagnetization. Specifically, the non-magnetizing directional magnetic field includes: firstly, a magnetizing coil is introduced with a magnetizing field (such as a magnetizing field shown in fig. 2) generated by pulse magnetizing current, so that a certain size of magnetizing field distribution also exists in an adjacent magnetic pole area, and the included angle between the magnetizing field direction distributed in the area and the magnetizing direction required by the adjacent magnetic pole is large, so that in the process of magnetizing a target magnetic pole, the adjacent magnetic pole which is charged or to be charged is demagnetized. Secondly, in the induced magnetic field generated by the skeleton induced eddy current of the permanent magnet motor at the rising edge stage and the early stage of the falling edge of the pulse magnetizing current, as shown in fig. 2, the skeleton eddy current has a flow direction opposite to that of the pulse magnetizing current, so that the skeleton generates an induced magnetic field opposite to the magnetizing magnetic field, and transverse superposed magnetic field components of the magnetizing magnetic field and the induced magnetic field on adjacent magnetic pole parts are dominant, as shown in fig. 3, so that the adjacent magnetic pole parts have obvious demagnetization risks.
It can be understood that, when the magnetizing coil is used for magnetizing a rotor with a smaller pole pitch, the more adjacent magnetic pole regions in which the magnetizing field ranges generated by the magnetizing coil overlap, the larger the demagnetizing regions on the adjacent magnetic pole regions are, and the magnetizing performance is reduced by the existing adjustment for the magnetizing coil, and the motor performance is reduced by the adjustment for the permanent magnet motor framework. Therefore, a method of improving the demagnetization resistance of the adjacent magnetic poles by adjusting the magnetizing coil and the bobbin is not preferable.
The magnetizing coil magnetic field regulating method provided by the invention has the advantages that the conductor is additionally arranged around the commonly used magnetizing coil in the field, the conductor is utilized to generate a magnetic field opposite to the magnetizing field, the magnetizing field configuration is regulated and controlled by controlling the characteristics of the conductor, namely, the magnetizing field configuration is optimized, so that the non-magnetizing direction magnetic field of the adjacent magnetic pole parts is weakened, namely, the transverse superposed magnetic field which is mainly occupied by the adjacent magnetic pole parts is weakened, and the demagnetization resistance of the adjacent magnetic pole parts is improved.
Fig. 4 is a flowchart of a method for regulating a magnetic field of a magnetizing coil according to an embodiment of the present invention, and as can be seen from fig. 4, the method for regulating a magnetic field of a magnetizing coil according to the present embodiment includes steps S10 to S30, which are detailed as follows:
and S10, placing the magnetizing coil on the target magnetic pole in the rotor of the permanent magnet motor to be charged in a clinging manner.
And S20, when the magnetizing field range generated by the magnetizing coil is overlapped with the adjacent magnetic poles positioned at the two sides of the target magnetic pole and demagnetization is generated on the adjacent magnetic poles, a conductor is additionally arranged around the magnetizing coil.
In steps S10 and S20, the provided magnetizing coil may be a coil for magnetizing the entire rotor of a high-power permanent magnet motor, such as a runway-type coil, which is commonly used in the art. By utilizing the magnetizing coil, the conductor is additionally arranged around the magnetizing coil, and the magnetizing requirements of motors with complex structures can be met by optimizing the position, the shape and the size of the conductor, so that the magnetizing coil is high in universality.
And S30, enabling the conductor to generate a magnetic field opposite to the magnetizing magnetic field, and regulating and controlling the configuration of the magnetizing magnetic field by controlling the characteristics of the conductor, wherein the characteristics of the conductor comprise the position, the shape and the size of the conductor. The two conductors are correspondingly arranged above other magnetic poles on two sides of the target magnetic pole in a close manner and are insulated from the other magnetic poles, so that the reverse magnetic field generated by each conductor weakens the non-magnetizing direction magnetic field of the adjacent magnetic pole.
From the above analysis of the reason for demagnetization of adjacent magnetic poles, it can be seen that the non-magnetizing direction magnetic field of the adjacent magnetic pole region is mainly determined by the magnetizing magnetic field generated by the pulse magnetizing current and the transverse superposed magnetic field component of the induced magnetic field generated by the skeleton eddy current. Therefore, weakening the non-magnetizing direction magnetic field of the adjacent magnetic field area is mainly to weaken the transverse superposed magnetic field of the adjacent magnetic pole part.
In step S30, the additional peripheral conductor may generate a magnetic field opposite to the magnetizing field by using the principle of electromagnetic induction, or may be provided by passing current through the conductor by using a power source. Wherein, the principle of utilizing the electromagnetic induction principle to provide reverse magnetic field does: at the rising edge stage of the pulse magnetizing current, the conductor induces an eddy current opposite to the pulse magnetizing current, a reverse magnetic field generated by the eddy current is superposed with a magnetizing magnetic field generated by the magnetizing coil, the transverse superposed magnetic field of the adjacent magnetic pole part is weakened, and the longitudinal magnetic field of the adjacent magnetic pole part can be enhanced, so that the two have positive effects on the demagnetization resistance of the adjacent magnetic pole. Meanwhile, since the eddy current has a certain weakening effect on the magnetic field near the magnetizing coil, referring to fig. 5a and 5b, the stress of the magnetizing coil is also reduced, and the effect is significant for a hollow coil.
It should be noted that fig. 5a and 5b are schematic diagrams of magnetic field distribution near the magnetizing coil after a conductor is not installed and a conductor is installed, respectively. In fig. 5a and 5b, the darker left area indicates the maximum magnetizing magnetic field strength, the darker right area indicates the minimum magnetizing magnetic field strength, and the lighter middle area indicates the maximum and minimum magnetizing magnetic field strengths.
The shape, position and size of the conductor can be optimally adjusted based on actual conditions, but the conductors arranged around the magnetizing coil are required to be connected end to form a closed loop (the situation that the current is introduced by using a power supply can be avoided).
Specifically, the conductor may be made of a magnetic conductive material or a non-magnetic conductive material, and is preferably made of a material having a good non-magnetic conductivity, such as copper or aluminum, in consideration of movement of the rotor after magnetization. Since the electromagnetic induction effect is not as strong as possible (because the reverse magnetic field weakens the magnetizing direction magnetic field of the target magnetic pole), a solid copper conductor with high mechanical strength can be adopted in the specific treatment process in consideration of manufacturability and low cost, and the electromagnetic induction effect is regulated and controlled by adjusting the size and the position.
It will be appreciated that the larger the size of the conductor, the greater the inductive effect, but on the one hand it need not be too great as mentioned aboveThe strong inductive effect, on the other hand, the increase in size causes an increase in the coupling of size and position to the inductive effect, which leads to a complex design and thus to a cross section of the conductor<10×20mm2And the temperature rise is reasonable. The above parameters are simply and conveniently processed and then mainly regulated and controlled by positions, the magnetic poles are slightly close to each other under the condition of ensuring insulation, and the distance between the magnetic poles and the magnetizing coil is determined according to the beneficial influence of weakening of the magnetic field in the non-magnetizing direction of the adjacent magnetic pole part. However, considering that the reverse magnetic field generated by the conductor also has a weakening effect on the magnetic field in the magnetizing direction of the target magnetic pole (i.e. the magnetizing magnetic field mentioned above), the distance between the conductor and the magnetizing coil can be comprehensively determined by taking the adverse effect of the reverse magnetic field on the magnetic field in the magnetizing direction of the target magnetic pole into consideration when the distance between the conductor and the magnetizing coil is designed.
To more clearly illustrate the method for regulating the magnetic field of the magnetizing coil provided by this embodiment, the following examples are given:
taking the modification of the integral magnetizing coil of the high-power fan rotor as an example, the core part of the conventional runway-type coil is a runway-type winding formed by winding 3 cakes of single hollow wires, wherein the cakes are electromagnetically connected in series end to end in the same winding direction, and cooling channels are connected in parallel, and the structure of the runway-type coil can be seen in fig. 6. The magnetizing coil is originally used for magnetizing a magnetic steel embedded rotor with a large pole spacing, and the magnetizing effect is good through theoretical demonstration and practical test.
Attempts have been made to use the magnetizing coil for a more powerful rotor. Referring to fig. 7, the motor rotor has a small pole pitch, and when the motor rotor is directly magnetized by the pulse magnetizing current shown in fig. 8, the magnetizing field of the target magnetic pole and the non-magnetizing directional magnetic field of the adjacent magnetic pole shown in fig. 9 and 10 are generated. As can be seen from fig. 9 and 10, the magnetization field of the target magnetic pole is basically qualified, but the non-magnetization direction magnetic field of the adjacent magnetic pole portion is high, so that demagnetization can be generated on the adjacent magnetic pole portion when the target magnetic pole is magnetized, and the original scheme cannot be used for remediation after the target magnetic pole is magnetized.
By adopting the scheme provided by the embodiment, namely, the square copper strip is additionally arranged on one side of the magnetizing coil, and the size optimization is carried out to a certain extent, as shown in fig. 11. Therefore, the square copper strip induces current opposite to the direction of the magnetizing coil, a longitudinal magnetic field is enhanced in the middle area of the magnetizing coil and the square copper strip, and a transverse magnetic field is weakened. The magnetic field in the target magnetic pole region is less affected by the distance from the target magnetic pole, as shown in fig. 12, and thus the whole is advantageous for magnetization.
By adopting the correction scheme, the design of replacing the magnetizing coil and the system is omitted, the cost of production and test is reduced, the magnetizing performance of the system is improved, only the copper strip needs to be additionally arranged outside the magnetizing coil, and the magnetizing coil is connected end to end in the modes of cables and the like, so that the universality of the original design scheme and products is realized.
Generally, compared with the prior art, the technical scheme of the invention has the following technical effects:
(1) according to the method for regulating and controlling the magnetic field of the magnetizing coil, the conductor is additionally arranged, the reverse magnetic field generated by the conductor is superposed with the magnetizing magnetic field generated by the magnetizing coil, and the position and the shape of the magnetizing magnetic field are regulated and controlled, so that the non-magnetizing direction magnetic field of the adjacent magnetic pole part is weakened, and the good magnetizing effect is ensured; meanwhile, the added conductor can reduce the magnetic field of the high-field area of the magnetizing coil, improve the stress distribution of the magnetic field coil and prolong the service life of the magnetizing coil.
(2) According to the method for regulating and controlling the magnetic field of the magnetizing coil, the shape of the conductor can be optimized, the magnetic field configuration which cannot be realized by coil winding can be generated, and the magnetizing requirements of motors with complex structures can be met; the shape of the conductor, the distance between the conductor and the magnetizing coil and the like are changed, so that the same magnetizing coil can generate various different magnetic field configurations, the universality of the magnetizing coil and the compatibility of the magnetizing coil and a magnetizing power supply can be effectively improved, and the use cost of the magnetizing coil is reduced.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A magnetizing coil magnetic field regulation and control method is characterized by comprising the following steps:
(1) placing a magnetizing coil on a target magnetic pole in a rotor of a permanent magnet motor to be charged in a clinging manner;
(2) when the magnetizing field range generated by the magnetizing coil is overlapped with the adjacent magnetic poles positioned at two sides of the target magnetic pole and demagnetization is generated on the adjacent magnetic poles, a conductor is additionally arranged around the magnetizing coil;
(3) enabling the conductor to generate a magnetic field opposite to the magnetizing magnetic field, and regulating and controlling the configuration of the magnetizing magnetic field by controlling the characteristics of the conductor, wherein the characteristics of the conductor comprise the position, the shape and the size of the conductor; each conductor is correspondingly arranged above other magnetic poles on two sides of the target magnetic pole in a close manner and is insulated from the other magnetic poles, so that the reverse magnetic field generated by each conductor weakens the non-magnetizing direction magnetic field of the adjacent magnetic pole.
2. The method for regulating and controlling the magnetic field of the magnetizing coil according to claim 1, wherein when the magnetizing coil generates a magnetizing magnetic field, the magnetizing magnetic field enables a skeleton in a rotor of the permanent magnet motor to be charged to generate eddy currents; and the non-magnetizing direction magnetic field of the adjacent magnetic poles is a superposed magnetic field of the magnetizing magnetic field and an induced magnetic field generated by the skeleton eddy current in the area of one side, close to the target magnetic pole, of the adjacent magnetic pole.
3. The method for regulating the magnetic field of the magnetizing coil according to claim 2, wherein the distance between the conductor and the magnetizing coil is determined according to the beneficial effect of weakening of the non-magnetizing direction magnetic field in the region of the adjacent magnetic pole on the side close to the target magnetic pole and the adverse effect of the weakening of the non-magnetizing direction magnetic field on the magnetizing direction magnetic field of the target magnetic pole.
4. The magnetizing coil magnetic field regulating method according to claim 3, wherein the step (3) specifically comprises:
connecting conductors around the magnetizing coil end to end, wherein the conductors generate induced eddy currents under the magnetizing magnetic field of the magnetizing coil; and regulating and controlling the configuration of the magnetizing magnetic field by controlling the characteristics of the conductor according to the reverse magnetic field generated by the induced eddy current.
5. The method for regulating the magnetic field of the magnetizing coil according to claim 4, wherein conductors around the magnetizing coil are connected end to end through a cable.
6. The magnetizing coil magnetic field regulating method according to claim 3, wherein the step (3) specifically comprises:
current is introduced to each conductor around the magnetizing coil, so that each conductor generates the reverse magnetic field; and regulating and controlling the configuration of the magnetizing magnetic field by controlling the characteristics of the conductor according to the reverse magnetic field.
7. The method for regulating the magnetic field of the magnetizing coil according to claim 5 or 6, wherein the conductor is made of a material with good electrical conductivity.
8. The method of claim 7, wherein the conductor is a solid copper conductor.
9. The method of claim 8, wherein the solid copper conductor is affixed to a reinforcing structure.
10. The method for regulating the magnetic field of the magnetizing coil according to claim 1, wherein the magnetizing coil is a racetrack coil.
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2021
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| CN1044942C (en) * | 1989-08-30 | 1999-09-01 | 托林顿公司 | Method and apparatus for forming magnetized zones on magnetizable body |
| JPH11275825A (en) * | 1998-03-19 | 1999-10-08 | Mitsubishi Electric Corp | Magnetizing device |
| JP2017060240A (en) * | 2015-09-15 | 2017-03-23 | パナソニックＩｐマネジメント株式会社 | Embedded magnet type rotor magnetization method and embedded magnet type rotor |
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