JP2023029265A - Magnetizing device and magnetizing method - Google Patents

Abstract

To provide a magnetizing device capable of sufficiently magnetizing an entire magnet with respect to a rotor in which the magnet is arranged.SOLUTION: A magnetizing device magnetizes a magnet arranged on a rotor of a motor. The rotor has a configuration in which a plurality of magnets are arranged on the rotor and a hole passing through the rotor is provided except a section where the magnet is arranged. The magnetizing device includes: a first magnetized unit that has a yoke and a coil and magnetizes the magnet from outside of the rotor; a second magnetized unit that has a yoke and a coil, being inserted into the hole penetrating the rotor, and magnetizes the magnet from inside of the rotor; a first power source for passing a first current to a coil of the first magnetized unit; and a second power source for passing a second current to the coil of the second magnetized unit.SELECTED DRAWING: Figure 1

Description

The present invention relates to a magnetizing device and a magnetizing method for magnetizing a magnet embedded in a rotor of a motor.

2. Description of the Related Art Among brushless motors in which magnets are embedded inside the rotor of the motor, motors in which magnets are arranged inside the rotor have been proposed (see, for example, Patent Documents 1 and 2).

Further, when magnetizing the magnet of the rotor, a magnetizing yoke (peripheral yoke) having a coil is arranged outside the rotor, and magnetization is performed by this magnetizing yoke (see, for example, Patent Documents 3).

JP 2014-107939 A JP 2015-177721 A JP 2010-104119 A

Even when magnetizing a rotor having magnets arranged at various positions, it is conceivable to arrange an outer yoke outside the rotor and perform magnetization by the outer yoke.

However, depending on the position of the magnet, when the magnet is magnetized by the outer yoke, the inner end of the magnet may not be magnetized, resulting in insufficient magnetization.

In order to solve the above-described problems, in the present invention, a magnetizing device and a magnetizing device capable of sufficiently magnetizing the entire magnets in a rotor having magnets that may be insufficiently magnetized are provided. It provides a method.

A magnetizing device of the present invention is a magnetizing device that magnetizes a magnet arranged in a rotor of a motor. A first magnetizing portion which has a yoke and a coil and magnetizes a magnet from the outside of the rotor, and a hole which has the yoke and the coil and penetrates the rotor. a second magnetized portion inserted into the rotor to magnetize the magnet from the inside of the rotor; a first power source for applying a first current to the coil of the first magnetized portion; and a second power source for applying a second current to the coil of the coil.

The magnetization method of the present invention is a magnetization method for magnetizing a magnet arranged in a rotor of a motor. A first magnetized portion having a yoke and a coil and disposed outside the rotor, and a hole passing through the rotor having the yoke and the coil. The inserted second magnetized portion, the first power supply for applying a first current to the coil of the first magnetized portion, and the second current being applied to the coil of the second magnetized portion. Using a second power supply for and a first current from the first power supply to the coil of the first magnetizing section to magnetize the magnet from the first magnetizing section, and a second power supply for A second current is supplied from the power supply No. 2 to the coil of the second magnetizing portion to magnetize the magnet from the second magnetizing portion.

According to the magnetizing device and the magnetizing method of the present invention described above, the magnet can be magnetized from the outside by the first magnetizing portion and the magnet can be magnetized from the inside of the rotor by the second magnetizing portion. Therefore, it becomes possible to sufficiently magnetize the entire magnet.

Further, according to the magnetizing device and the magnetizing method of the present invention, the first power source for applying the first current to the coil of the first magnetizing portion and the second power source to the coil of the second magnetizing portion. and a second power supply for supplying a current of . Therefore, by controlling the first current flowing from the first power source to the coil of the first magnetizing portion and the second current flowing from the second power source to the coil of the second magnetizing portion, , the magnet can be efficiently magnetized.

1 is a schematic configuration diagram (perspective view) of a magnetizing device according to a first embodiment of the present invention; FIG. FIG. 2 is a plan view of the magnetizing device of FIG. 1; 2 is a plan view of the rotor of FIG. 1; FIG. FIG. 4 is a plan view of a state in which the magnetizing device of FIG. 2 and the rotor of FIG. 3 are assembled; 2 is a circuit block diagram including a power source of the magnetizing device according to the first embodiment of the present invention; FIG. 4 is a schematic configuration diagram (a plan view of a main part) of a rotor and a magnetizing device in Analysis Example 1; FIG. 8 is a diagram showing the relationship between the yoke current in Analysis Example 1 and the generated magnetic field at point A6; FIG. FIG. 11 is a schematic configuration diagram (plan view of main parts) of a rotor and a magnetizing device in Analysis Example 2; FIG. 10 is a diagram showing the relationship between the yoke current in Analysis Example 2 and the generated magnetic field at point B6;

First, prior to describing specific embodiments of the present invention, an outline of the present invention will be described.

The rotor of the motor has magnets embedded in holes provided in the rotor.
The rotor of the motor may also be provided with holes or holes (holes passing through the rotor) in addition to the holes in which the magnets are embedded, if necessary. Specific examples thereof include the void 37 and the mass reduction hole 38 shown in FIG. 2 of Patent Document 1, and the flux barrier 62 shown in FIG. 5 of Patent Document 2.
In this way, the purpose of providing holes or holes in areas other than the portion of the rotor where the magnets are embedded is to reduce the weight of the rotor, air-cool the rotor, facilitate the insertion of magnets, provide a flux barrier, and the like. is mentioned.
Then, depending on the purpose, a hole or hole having an appropriate size and shape is provided at an appropriate position.

In the present invention, a hole provided in the rotor (a hole passing through the rotor) other than the hole in which the magnet is embedded is used, and the magnet is magnetized from the inside of the rotor by inserting the hole into the hole. , constitute a second magnetized portion.
Further, in the present invention, the coil of the first magnetized portion that magnetizes the magnet from the outside of the rotor and the coil of the second magnetized portion that magnetizes the magnet from the inside of the rotor are supplied from separate power sources. It is constructed so that magnetization is performed by applying an electric current.

A magnetizing device of the present invention is a magnetizing device that magnetizes a magnet arranged on a rotor of a motor.
In the magnetizing device of the present invention, a plurality of magnets are arranged in the rotor, and holes penetrating through the rotor are provided in areas other than the portions where the magnets are arranged.
Furthermore, the magnetizing device of the present invention has a yoke and a coil, and has a first magnetizing portion that magnetizes the magnet from the outside of the rotor; a second magnetized portion for magnetizing the magnet from inside the rotor; a first power supply for applying a first current to the coil of the first magnetized portion; and a second power supply for supplying two currents.

A magnetization method of the present invention is a magnetization method for magnetizing a magnet arranged in a rotor of a motor.
In the magnetizing method of the present invention, the rotor is configured such that a plurality of magnets are arranged in the rotor, and holes passing through the rotor are provided in areas other than the portions where the magnets are arranged.
Furthermore, in the magnetization method of the present invention, a first magnetizing portion having a yoke and a coil and disposed outside the rotor; a second magnetized portion, a first power source for applying a first current to the coil of the first magnetized portion, and a second power supply for applying a second current to the coil of the second magnetized portion power supply and use. A first current is supplied from the first power source to the coil of the first magnetized portion to magnetize the magnet from the first magnetized portion, and the second magnetized portion is magnetized from the second power source. A second current is applied to the coil of to magnetize the magnet from the second magnetizing portion.

In the present invention, the first magnetizing portion is arranged outside the rotor and magnetizes the magnets of the rotor from the outside.
The first magnetized portion is configured to have a yoke and a coil.
A first current is supplied from a first power source to the coil of the first magnetized portion. Therefore, a first power source is electrically connected to the coil of the first magnetized portion.

In the present invention, the second magnetizing portion is inserted into a hole provided in the rotor and passing through the rotor, and magnetizes the magnet of the rotor from the inside of the rotor.
The second magnetized portion is also configured to have a yoke and a coil.
A second current is supplied from a second power source to the coil of the second magnetized portion. Therefore, a second power source is electrically connected to the coil of the second magnetized portion.
The second power supply and the first power supply for applying the first current to the coil of the first magnetizing portion are two separate power supplies. A magnetizing device is configured with a first power supply and a second power supply, respectively.

Since the first power supply and the second power supply are two separate power supplies, the first current is passed through the coil of the first magnetized portion and the second current is passed through the coil of the second magnetized portion. and can be different currents.

Examples of the hole penetrating through the rotor provided in the rotor into which the second magnetized portion is inserted have the following configuration.
(1) A hole provided between adjacent magnets (for example, the mass reduction hole 38 in FIG. 2 of Patent Document 1) (2) A hole provided inside the magnet at the same radial position as the magnet (for example, the Gaps 37 in FIG. 2 of Document 1)
(3) A hole provided inside the magnet at a radial position different from that of the magnet (for example, the flux barrier 62 in FIG. 5 of Patent Document 2)

When magnetizing the magnet of the rotor, the second magnetized portion is inserted into the hole provided in the rotor, and the rotor is assembled inside the first magnetized portion.
Then, the magnets of the rotor are magnetized by the first magnetized portion and the second magnetized portion.
In particular, when the first magnetized portion and the second magnetized portion are configured to have coils, the coils of the first magnetized portion and the coils of the second magnetized portion are supplied with current from respective power sources. to generate a magnetic field in the coil. As a result, the magnets of the rotor can be magnetized by the coils of the first magnetized portion and the coils of the second magnetized portion.

According to the magnetizing device and the magnetizing method of the present invention, the magnet can be magnetized from the outside by the first magnetizing section and the magnet can be magnetized from the inside of the rotor by the second magnetizing section. , it becomes possible to sufficiently magnetize the entire magnet.

Further, according to the magnetizing device and the magnetizing method of the present invention, the first power source for applying the first current to the coil of the first magnetizing portion and the second power source to the coil of the second magnetizing portion. and a second power supply for supplying a current of .
Thereby, the first current flowing from the first power supply to the coil of the first magnetizing portion and the second current flowing from the second power supply to the coil of the second magnetizing portion can be controlled. Thus, the magnet can be efficiently magnetized.

In the magnetizing device of the present invention, the first current and the second current are preferably arranged such that the time when the first current reaches its peak and the time when the second current reaches its peak substantially match each other. It is configured to allow current to flow.
More preferably, a delay circuit is connected to either the first power supply or the second power supply, and the delay circuit delays the time when the first current reaches its peak and the time when the second current reaches its peak. , and substantially match each other.
By adopting these configurations, the magnet can be magnetized more efficiently.

(First embodiment)
FIG. 1 shows a schematic configuration diagram (perspective view) of a magnetizing device according to a first embodiment of the present invention. FIG. 1 shows a magnetizing device 1 in which a rotor 20 of a motor is incorporated.
A magnetizing device 1 according to the present embodiment is a device that magnetizes a magnet 21 embedded in a rotor 20 .
2 shows a plan view of the magnetizing device 1 of FIG. 1, FIG. 3 shows a plan view of the rotor 20, and FIG. 4 shows a plan view of the magnetizing device 1 with the rotor 20 incorporated therein.

A rotor 20 to be magnetized by the magnetizing device 1 is connected to a shaft (output shaft) 24 .
The magnets 21 are embedded in holes 22 radially provided along the radial direction of the rotor 20 .

A hole 23 is provided through the rotor 20 at a position between two adjacent magnets 21 of the rotor 20 .
This hole 23 is positioned between two adjacent magnets 21 and is arranged to protrude inward (toward the shaft 24 ) from the inner end of the magnet 21 .

The magnetizing device 1 includes an outer yoke 2 and a coil 5 that magnetize the magnet 21 from the outside of the rotor 20 as a first magnetizing portion that magnetizes the magnet 21 .
The magnetizing device 1 also includes an inner peripheral yoke 6 and a coil 7 that magnetize the magnet 21 from inside the rotor 20 as a second magnetizing portion that magnetizes the magnet 21 .

The outer yoke 2 constituting the first magnetized portion is arranged so as to surround the outer side of the rotor 20, and the coil 5 is inserted into the hole 3 provided in the portion near the inner periphery of the outer yoke 2 to form the coil. It is insulated and fixed by the support 4 .
For example, the coil connects two coils 5 and extends above the coil 5 in a substantially U shape.

The coil support 4 can be made of, for example, glass epoxy (epoxy glass resin).
The coil 5 of the first magnetized portion can be configured by using an electric wire formed of a wire material with high conductivity such as a copper wire and covering the circumference of the electric wire with an insulating covering material.
A power supply for applying current to the coil 5 is connected to the coil 5 of the first magnetized portion.

The inner yoke 6 forming the second magnetized portion is inserted into a hole 23 provided in the rotor 20 .
A coil 7 is provided on the inner peripheral yoke 6 . For example, the coil 7 connects two coils 7 and extends above the coil 7 in a substantially U shape.

The inner peripheral yoke 6 can be made of, for example, glass epoxy (epoxy glass resin) or the like.
The coil 7 of the second magnetized portion uses an electric wire formed of a wire material with high conductivity such as copper wire, similarly to the coil 5 provided on the outer yoke 2 of the first magnetized portion. can be configured such that the periphery of is covered with an insulating covering material.
A power source for applying current to the coil 7 is connected to the coil 7 of the second magnetized portion.

Further, the magnetizing device 1 of the present embodiment further includes a power source for applying current to the coil 5 of the first magnetizing portion and a power source for applying current to the coil 7 of the second magnetizing portion. are two separate power sources, respectively, and are configured with these two power sources.

FIG. 5 shows a circuit block diagram including a power source of the magnetizing device 1 of this embodiment.
The magnetizing device 1 of this embodiment has a CPU (Central Processing Unit) 31, a delay circuit 32, a first gate circuit 33 and a second gate circuit 34, as shown in FIG.

The CPU 31 controls the delay circuit 32, the first gate circuit 33, and the second gate circuit 34 based on the magnetization command signal Sm.
The first gate circuit 33 serves as a first power source for supplying current to the coil 5 of the first magnetized portion, and generates a first gate signal S1 under the control of the CPU 31 . Based on the pulse of the first gate signal S1, a pulsed current is supplied to the coil 5 of the first magnetized portion as the first current.
The second gate circuit 34 serves as a second power source for supplying current to the coil 7 of the second magnetized portion, and generates a second gate signal S2 under the control of the CPU 31 . Based on the pulse of the second gate signal S2, a pulsed current is supplied to the coil 7 of the second magnetized portion as the second current.
The delay circuit 32 is connected to the second gate circuit 34 and delays the second gate signal S2 generated by the second gate circuit 34 with respect to the first gate signal S1 generated by the first gate circuit 33 .

Here, the reason why the delay circuit 32 delays the second gate signal S2 with respect to the first gate signal S1 in the magnetizing device 1 of the present embodiment will be described in detail below.

Since the first magnetized portion (the outer yoke 2 and the coil 5) is relatively unrestricted, a coil with a large winding diameter can be used as the coil 5 of the first magnetized portion.
On the other hand, since the second magnetized portion (the inner yoke 6 and the coil 7) is inserted into the hole 23 penetrating the rotor 20, the coil 7 of the second magnetized portion has a winding diameter of It becomes necessary to use a coil with a small .
Moreover, since the magnetizing device 1 is required to have durability so as to be able to magnetize a large amount of the rotor 20, Joule loss (copper loss) generated in the windings of the coils becomes a problem.

Since the coil 5 of the first magnetized portion uses a coil with a large winding diameter, it has large resistance and inductance. In order to obtain a magnetic field for magnetization, the coil 5 of the first magnetizing portion needs to pass a current of several kA to ten and several kA, and the pulse width of the current also increases.
Since a coil with a small winding diameter is used for the coil 7 of the second magnetized portion, its resistance and inductance are small.
Here, if one power supply is connected to both the coil 5 of the first magnetized portion and the coil 7 of the second magnetized portion, the coil 7 of the second magnetized portion will also , a current of several kA to ten and several kA similar to the coil 5 of the first magnetized portion is supplied. At this time, the Joule loss in the coil 7 of the second magnetized portion, which has low resistance and inductance, becomes unnecessarily large. Therefore, the durability of the coil 7 of the second magnetized portion may deteriorate.

Therefore, a first power supply for applying a current to the coil 5 of the first magnetized portion and a second power supply for applying a current to the coil 7 of the second magnetized portion are provided as separate power supplies. prepare. As a result, the current (first current) flowing through the coil 5 of the first magnetized portion and the current (second current) flowing through the coil 7 of the second magnetized portion are adjusted to appropriate current amounts and pulses. width can be made.
In this case, since the resistance and inductance of the coil 7 of the second magnetized portion are small, the second power supply supplies a current with a small current amount and a narrow pulse width to the coil 7 of the second magnetized portion. do.

However, the first current supplied from the first power source to the coil 5 of the first magnetized portion and the second current supplied from the second power source to the coil 7 of the second magnetized portion may be supplied at the same time. When supplied, the pulse widths of the respective currents are different, so that the peak times of the currents do not match, and efficient magnetization cannot be achieved.

Therefore, in the magnetizing device 1 of the present embodiment, as shown in FIG. 5, the delay circuit 32 is connected to the second gate circuit 34 constituting the second power supply.
As a result, the second power supply (second gate circuit 34 ) to the coil 7 of the second magnetizing portion, the supply of the second current having a narrow pulse width can be delayed to substantially match the peak times of the current. Efficient magnetization becomes possible by matching the peak times of the current.

In the magnetizing device 1 of the present embodiment, when magnetizing the magnets 21 of the rotor 20, as shown in FIGS. The inner peripheral yoke 6 of the first magnetized portion is inserted, and the rotor 20 is assembled inside the outer peripheral yoke 2 of the first magnetized portion.
Then, from the first power source (first gate circuit 33) to the coil 5 of the first magnetized portion, and from the second power source (second gate circuit 34) to the coil 7 of the second magnetized portion, A magnetic field is generated in each of the coils 5 and 7 by applying an electric current to magnetize the magnet 21 from the outside of the rotor 20 and from the inside of the rotor 20, respectively.
This makes it possible to sufficiently magnetize the entire arranged magnets 21 .

According to the magnetizing device 1 of the present embodiment described above, the first magnetizing portion composed of the outer yoke 2 and the coil 5 and the second magnetizing portion composed of the inner yoke 6 and the coil 7 are provided. and
As a result, the magnet 21 can be magnetized from the outside by the first magnetizing portion and the magnet 21 can be magnetized from the inside of the rotor 20 by the second magnetizing portion. It becomes possible to magnetize.

Further, according to the magnetizing device 1 of the present embodiment, the first power source (first gate circuit 33) for applying the first current to the coil 5 of the first magnetizing portion and the second and a second power source (second gate circuit 34) for applying a second current to the coil 7 of the magnetic portion.
Thereby, the first current flowing from the first power source to the coil 5 of the first magnetized portion and the second current flowing from the second power source to the coil 7 of the second magnetized portion are controlled. By doing so, it becomes possible to magnetize the magnet 21 efficiently.

Furthermore, according to the magnetizing device 1 of the present embodiment, the delay circuit 32 is connected to the second power supply (the second gate circuit 34), and the delay circuit 32 delays the second current from the second power supply. , with respect to the first current from the first power supply. As a result, the time when the first current reaches its peak and the time when the second current reaches its peak can be substantially matched, so that efficient magnetization can be achieved.

(Modification)
The position of the hole in the rotor for providing the inner peripheral yoke of the second magnetized portion is not limited to the position between two adjacent magnets as in the first embodiment. It does not matter if it is the position.
For example, like the air gap 37 in FIG. 2 of Patent Document 1, a hole provided inside the magnet at the same radial position as the magnet, or like the flux barrier 62 in FIG. It is also possible to use overlapping holes.
In either case, the inner yoke and coil of the second magnetized portion may be configured so as to match the positions of the rotor holes.

Further, in the first embodiment, the magnet 23 is arranged between the first magnetized portion and the second magnetized portion. , are not particularly limited, and other positional relationships are possible.

Further, in the first embodiment, the magnets 21 are embedded in the holes 22 provided in the rotor 20, but other configurations in which the magnets are arranged in the rotor, such as magnets on the surface of the rotor, may be used. A mounted configuration can also be employed.

Further, in the first embodiment, the magnets 21 are arranged radially on the rotor 20, but the arrangement of the magnets on the rotor is not limited to the radial arrangement, and other arrangements may be adopted. Even with the arrangement of , the entire magnet can be sufficiently magnetized by the first magnetized portion and the second magnetized portion.
Other arrangements of magnets include, for example, a configuration in which magnets are arranged along the outer circumference of the rotor, such as the configuration of FIG. 7 of Patent Document 2 and the configuration of FIG. 1 of Patent Document 3.

In the first embodiment, the first current is a wide pulse and the second current is a narrow pulse. ) was connected to the delay circuit 32 .
On the other hand, for example, when the first current is a narrower pulse than the second current, a delay circuit is connected to the first power supply through which the first current flows, and the first and the peak times of the currents of the second current are almost matched.

<Analysis example>
Here, regarding the actual configuration of the magnetizing device of the present invention including the first magnetizing portion and the second magnetizing portion and the configuration of the magnetizing device including only the first magnetizing portion, A computer simulation was used to analyze the magnitude of the magnetic field generated at several points on the magnet when the magnet placed on the rotor was magnetized.
The configuration of the magnetizing device having only the first magnetizing portion is substituted by the configuration of the magnetizing device of the present invention by not applying current to the coil of the second magnetizing portion.

(Analysis example 1)
FIG. 6 shows a schematic configuration diagram (plan view of essential parts) of the rotor and the magnetizing device of Analysis Example 1. As shown in FIG.
FIG. 6 shows a plan view of a main part (one unit of repetition, a part bounded by the center line of two radially arranged magnets 21) of the rotor 20 and the magnetizing device having a circular planar shape. .
As shown in FIG. 6, the magnets 21 are arranged radially.
The coil 5 in the outer yoke 2 has 6×2=12 windings, and the coil 7 in the inner yoke 6 has two windings. The inner peripheral yoke 6 is positioned between two adjacent magnets 21 and includes the same radial position as the inner ends of the magnets 21 .

Analysis of the generated magnetic field was performed at three locations (A1 to A3) near the sides of the magnet 21 and three locations (A4 to A6) near the center line of the magnet 21. FIG.
Then, the current flowing through the coil 5 in the outer yoke 2 (hereinafter referred to as "outer yoke current") is changed to 18 kA, 19 kA, 20 kA, and 21 kA, and the current flowing through the coil 7 in the inner yoke 6 (hereinafter referred to as "outer yoke current"). 0 kA (no current flow), 15 kA, 16 kA, 17 kA, 18 kA, 19 kA, and 20 kA. was analyzed.

Here, out of the six points A1 to A6, the point A6 (the innermost point on the center line of the magnet 21) where the generated magnetic field is the weakest is the combination of the outer yoke current and the inner yoke current and the generated magnetic field. are shown in Table 1 and FIG.
In FIG. 7, the horizontal axis represents the inner peripheral yoke current, the vertical axis represents the generated magnetic field (T), and the values of the same outer peripheral yoke current are connected by lines.

As can be seen from Table 1 and FIG. 7, compared to the case where the inner yoke current is 0 kA and only the first magnetized portion is used, the inner yoke current is 15 to 20 kA and the second magnetized portion was also used, a significant difference was observed in the generated magnetic field at point A6.
As shown in FIG. 7, when a magnetic field of 1.5 T or more is required, the inner yoke current should be 17 kA or more for the outer yoke current of 20 kA.

Further, among the six points A1 to A6, at the central and outer points A1, A2, A4, and A5, there was no clear difference in the magnitude of the generated magnetic field and magnetic lines of force depending on the presence or absence of the inner yoke current. In these respects, the influence of the first magnetized portion is large, and it is considered that the first magnetized portion is sufficiently magnetized.
On the other hand, at the inner points A3 and A6, the magnitude of the generated magnetic field and the lines of magnetic force are different depending on the presence or absence of the inner yoke current.
Therefore, by also using the second magnetized portion, the inside of the magnet can be sufficiently magnetized, and the range in which the desired magnetic field is generated can be expanded.

(Analysis example 2)
FIG. 8 shows a schematic configuration diagram (plan view of essential parts) of the rotor and the magnetizing device of Analysis Example 2. As shown in FIG.
In FIG. 8, of the rotor 20 and the magnetizing device having a circular planar shape, the plane of the main part (one unit of repetition, the part bordering on the center line of the two adjacent coil supports 4 in the outer yoke 2) Figure shows.
As shown in FIG. 8, two magnets 21 arranged diagonally with respect to the radial direction of the rotor 20 and one magnet 21 arranged along the outer circumference of the rotor 20, for a total of three magnets. 21 are arranged in a substantially triangular shape.
The coil 5 in the outer yoke 2 has 12×2=24 windings, and the coil 7 in the inner yoke 6 has 4 windings. The inner peripheral yoke 6 is located between two magnets 21 arranged obliquely with respect to the radial direction of the rotor 20 and is arranged inside the same radial position as the inner end of the magnets 21 .
The generated magnetic field was analyzed at six locations (B1 to B6) near the side surface of the magnet 21 arranged obliquely to the radial direction of the rotor 20 and near the side surface of the magnet 21 arranged along the outer circumference of the rotor 20. It was performed at 6 locations (C1 to C6).
Then, the outer yoke current is changed to 15 kA, 16 kA, 17 kA, 18 kA, 19 kA and 20 kA, and the inner yoke current is changed to 0 kA (no current flow), 10 kA, 11 kA, 12 kA, 13 kA, 14 kA and 15 kA. , the magnitude (T) of the generated magnetic field was analyzed.

Here, of the 12 points B1 to B6 and C1 to C6, the point B6 (the innermost point of the magnet 21) where the generated magnetic field is the weakest is the combination of the outer yoke current and the inner yoke current and the generated magnetic field. are shown in Table 2 and FIG.
In FIG. 9, the horizontal axis represents the inner peripheral yoke current, the vertical axis represents the generated magnetic field (T), and the values of the same outer peripheral yoke current are connected by lines.

As can be seen from Table 2 and FIG. 9, compared to the case where the inner yoke current is 0 kA and only the first magnetized portion is used, the inner yoke current is 10 to 15 kA and the second magnetized portion was also used, a significant difference in the generated magnetic field at point B6 was observed.
As shown in FIG. 9, when a magnetic field of 2.0 T or more is required, an inner yoke current of 10 kA or more is sufficient for an outer yoke current of 18 kA, and an outer yoke current of 17 kA is , the inner yoke current should be 13 kA or more.

At points B1, B2, B4, B5, and C1 to C6 among the 12 points B1 to B6 and C1 to C6, there is a clear difference in the magnitude of the generated magnetic field and magnetic lines of force depending on the presence or absence of the inner yoke current. there was no In these respects, the influence of the first magnetized portion is large, and it is considered that the first magnetized portion is sufficiently magnetized.
On the other hand, at the points B3 and B6 on the inner side, the magnitude of the generated magnetic field and the lines of magnetic force differed depending on the presence or absence of the inner yoke current.
Therefore, in the configuration of Analysis Example 2, similarly to the configuration of Analysis Example 1, by using the second magnetized portion, the inside of the magnet can be sufficiently magnetized, and a desired magnetic field is generated. You can extend the range.

From the results of Analysis Example 1 and Analysis Example 2, points other than inner points A3, A6, B3, and B6 are substantially sufficiently magnetized even by the first magnetized portion alone. Therefore, the magnetization of the magnet, that is, the formation of the N pole and the S pole, can be performed only by the first magnetized portion. Further, the magnet can be magnetized by the first magnetizing portion regardless of the arrangement of the magnet on the rotor.

In addition, when the first and second magnetized portions are used, the inner points A3, A6, B3, and B6, which are difficult to magnetize sufficiently with only the first magnetized portion, , can be sufficiently magnetized, so that the entire magnet can be sufficiently magnetized.

The effect of sufficiently magnetizing the entire magnet by the second magnetizing portion is affected by the distance between the second magnetizing portion and the magnet. distance should not be too large. Therefore, regardless of the arrangement of the magnets and the second magnetized portion on the rotor, the effect of sufficiently magnetizing the entire magnet by the second magnetized portion can be obtained to some extent.

1 magnetizing device 2 outer yoke 3 hole 4 coil support 5 coil 6 inner yoke 7 coil 20 rotor 21 magnet 22 hole 23 hole 24 shaft (output shaft) 31 CPU, 32 delay circuit, 33 first gate circuit, 34 second gate circuit

Claims (5)

A magnetizing device for magnetizing a magnet arranged in a rotor of a motor,
The rotor has a configuration in which a plurality of the magnets are arranged in the rotor, and a hole penetrating the rotor is provided in a portion other than the portion where the magnets are arranged,
a first magnetizing section having a yoke and a coil and magnetizing the magnet from the outside of the rotor;
a second magnetizing portion having a yoke and a coil, inserted into a hole passing through the rotor, and magnetizing the magnet from inside the rotor;
a first power source for applying a first current to the coil of the first magnetized portion;
a second power source for applying a second current to the coil of the second magnetized portion;
A magnetizing device. 2. The magnetizing device according to claim 1, wherein said magnet is arranged between said first magnetizing portion and said second magnetizing portion. 3. The method according to claim 2, wherein the first current and the second current are supplied such that the peak time of the first current and the peak time of the second current substantially match. magnetizing device. A delay circuit is connected to either one of the first power supply and the second power supply, and the time at which the first current reaches a peak and the time at which the second current reaches a peak are determined by the delay circuit. , are substantially matched. A magnetization method for magnetizing a magnet arranged in a rotor of a motor, comprising:
The rotor has a configuration in which a plurality of the magnets are arranged in the rotor, and a hole penetrating the rotor is provided in a portion other than the portion where the magnets are arranged,
a first magnetized portion having a yoke and a coil and arranged outside the rotor;
a second magnetized portion having a yoke and a coil and inserted into a hole passing through the rotor;
a first power source for applying a first current to the coil of the first magnetized portion;
using a second power source for applying a second current to the coil of the second magnetizing portion,
applying the first current from the first power supply to the coil of the first magnetized portion to magnetize the magnet from the first magnetized portion;
and magnetizing the magnet from the second magnetizing section by applying the second current from the second power supply to the coil of the second magnetizing section.

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