JP2009050131A - Polarizing apparatus - Google Patents

Abstract

To provide a magnetizing apparatus capable of improving the efficiency of magnetization without leakage of a magnetic field.
A magnetizing device includes a magnetizing yoke having a plurality of protrusions having a trapezoidal shape on an inner diameter side in accordance with a shape of a claw of a rotor of a rotating electric machine, A wound magnetizing coil 30 is provided. The magnetizing yoke 20 has an annular portion 24 disposed on the outer peripheral side of the plurality of projecting portions 22, and the magnetizing coil 30 is between the plurality of projecting portions 22 arranged in the circumferential direction. It is wound around the ring portion 24. By passing an electric current through the magnetizing coil 30, the magnet mounted between the claw portions of the rotor is magnetized.
[Selection] Figure 3

Description

  The present invention relates to a magnetizing device that magnetizes a magnet incorporated in a rotor of a vehicle AC generator mounted on a passenger car or truck.

Conventionally, a magnetic field is generated by winding a rectangular portion (Fig. 5) projecting toward the inner diameter side of the magnetized yoke (Fig. 6), and flowing a high current for a moment, and then flowing this magnetic field through the magnet material. A magnetizing apparatus that performs magnetizing is known (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 11-275825 (page 3-4, FIG. 1-7)

  As shown in FIG. 7, the shape of the claw portion 100 of the rotor of the vehicle alternator has a trapezoidal shape, and by attaching a magnet 102 such as neodymium between the adjacent claw portions 100, Generation of leakage magnetic flux between the parts 100 can be prevented, and the power generation performance of the vehicular generator can be improved. Such a magnet 102 must be magnetized after assembling because the assemblability deteriorates if it is magnetized before assembling on the rotor. FIG. 8 shows a state in which the conventional magnetized yoke 110 is disposed so as to face the claw portion 100.

  By the way, since the conventional magnetizing yoke 110 has a rectangular shape, the magnetic field of the magnetizing yoke 110 arranged so as to face the claw portion 100 is likely to leak to the adjacent claw portion 100, and the efficiency of magnetization is increased. There was a problem of being bad. FIG. 9 is a view of the area A shown in FIG. 8 as viewed from the direction of the rotation axis. Since the claw portions 100A and 100B have a trapezoidal shape, a part of the magnetic field generated by the N-pole magnetizing yoke 110 is partially applied to the claw portion 100B adjacent to the claw portion 100A facing the N-pole magnetizing yoke 110. And leaks occur.

  In addition, each winding wound around the rectangular magnetizing yoke adjacent in the circumferential direction cannot be directly wound around the magnetizing yoke because the interval between the adjacent magnetizing yokes is narrow. The magnetic yoke is inserted in the radial direction. In order to facilitate the insertion, the insertion is performed in a state where a predetermined gap is formed between the winding and the magnetized yoke, and the gap is filled with resin so that the winding does not move during energization. There is also a problem that the amount of resin to be filled is increased and cooling performance is lowered.

  The present invention has been created in view of the above points, and an object of the present invention is to provide a magnetizing apparatus capable of improving the efficiency of magnetization without leakage of a magnetic field. Another object of the present invention is to provide a magnetizing device capable of improving the cooling performance.

  In order to solve the above-described problems, a magnetizing apparatus according to the present invention includes a magnetizing yoke having a plurality of protrusions whose inner diameter side ends have a trapezoidal shape in accordance with the shape of a claw of a rotor of a rotating electrical machine, And a magnetizing coil wound around the magnetizing yoke, and magnetizing the magnet mounted between the claws by passing a current through the magnetizing coil. By combining the shape of the claw part of the rotor with the shape of the magnetizing yoke opposite to this, the leakage efficiency of the magnetic field generated between the adjacent magnetizing yoke and the claw part of the rotor is eliminated. Can be improved.

  Moreover, as for the several projection part mentioned above, it is desirable for an inner diameter side edge part to have a trapezoid shape, and for an outer diameter side from an inner diameter side edge part to have a rectangular cross-sectional shape. Thereby, since it is only necessary to change only the tip shape of the protruding portion of the magnetized yoke, the design change can be minimized.

  The magnetizing yoke described above has an annular portion disposed on the outer peripheral side of the plurality of projecting portions, and the magnetizing coil is between the plurality of projecting portions arranged in the circumferential direction, and the annular portion It is desirable to be wound around. By winding the magnetizing coil directly around the annular part, the gap between the magnetizing coil and the magnetizing yoke can be reduced and the magnetizing coil can be easily fixed, and the magnetizing coil is fixed. Therefore, the amount of resin used can be reduced and the cooling performance can be improved. Further, since the three sides of the magnetized coil excluding the inner peripheral side of the annular portion are exposed to the outside, the magnetized coil can easily dissipate heat, and the cooling performance can be further improved.

  Moreover, it is desirable to use a rectangular wire having a rectangular cross section as the above-described magnetizing coil. As a result, the space factor of the magnetizing coil can be increased, and the magnetizing efficiency can be improved by increasing the current.

  Moreover, it is desirable to further include a cooling member that is disposed around the above-described magnetizing coil and cools the magnetizing coil. Specifically, it is desirable that the cooling member described above is opposed to three sides of the magnetized coil located on the outer diameter side and both end surfaces in the axial direction of the annular portion. Since the area exposed to the outside of the magnetizing coil increases, the exposed portion can be cooled over a wide range by the cooling member, and the cooling performance can be further improved.

  Hereinafter, a magnetizing apparatus according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings. As shown in FIG. 7, a rotor 1 of a rotating electrical machine (for example, a vehicular AC generator) to be magnetized has claw portions as a plurality of claw-shaped magnetic poles that alternately form NS magnetic poles along the rotation direction. A pair of pole cores 200 and 202 having 100, a magnet 102 such as neodymium mounted between the claws 100 of the pair of pole cores 200 and 202, and an insulated copper wire are wound cylindrically and concentrically. A rotating excitation coil (not shown) and a rotating shaft 210 are provided. Actually, a pair of cooling fans (not shown) used for discharging the cooling air sucked along the rotating shaft 210 in the radial direction is welded to the axial end surfaces of the pole cores 200 and 202, respectively. Is attached by.

  FIG. 1 is a diagram illustrating an overall configuration of a magnetizing apparatus according to an embodiment. The magnetizing device 10 of the present embodiment includes a magnetizing yoke 20 having a plurality of protrusions 22 whose inner diameter side ends have a trapezoidal shape in accordance with the shape of the claw portion 100 of the rotor 1, and the magnetizing yoke 20 is wound around the magnetizing yoke 20. A rotated magnetizing coil 30 and a cooling member 40 arranged around the magnetizing coil 30 to cool the magnetizing coil 30 are provided.

  FIG. 2 is a partial perspective view showing the detailed shape of the magnetized yoke 20. FIG. 3 is a partial perspective view showing a state in which the magnetizing coil 30 is wound around the magnetizing yoke 20. As shown in FIG. 2, the plurality of protrusions 22 provided on the magnetized yoke 20 have a trapezoidal shape on the inner diameter side end 22 </ b> A and a rectangular cross-sectional shape on the outer diameter side from the inner diameter side end. The magnetized yoke 20 has an annular portion 24 arranged on the outer peripheral side of the plurality of protrusions 22.

  As shown in FIG. 3, the magnetizing coil 30 is wound around the annular portion 24 between the plurality of protrusions 22 arranged in the circumferential direction. The magnetizing coil 30 uses a rectangular wire having a rectangular cross section. The cooling member 40 disposed around the magnetizing coil 30 to cool the magnetizing coil 30 is provided on three sides of the magnetizing coil 30 located on each of the outer diameter side and both end surfaces in the axial direction of the annular portion 24, that is, protrusions. It is formed in a U shape so that a part other than a part of the magnetizing coil 30 located in the space between the parts 22 faces. For example, the cooling member 40 is constituted by a cooling pipe through which a coolant flows. By cooling the cooling member 40 in contact with the surface of the magnetizing coil 30, the temperature of the magnetizing coil 30 can be lowered to a lower temperature (for example, 0 ° C. or less) than before, and the coil resistance can be lowered. The magnetic current and the magnetic field generated by this current can be increased. As a result, the magnetization time during mass production can be shortened, and the magnetization quality can be stabilized by using a strong magnetic field.

  Magnetization of the magnet 102 using the magnetizing device 10 is performed after the magnet 102 before magnetization is mounted on the rotor 1. Specifically, the rotor 1 assembled as shown in FIG. 7 is arranged so that the claw portion 100 of the rotor 1 of the same shape and the tip portion of the projection 22 of the magnetizing yoke 20 face each other. After being set on the inner peripheral side, a current is passed through the magnetizing coil 30 to generate a magnetic field that passes through each protrusion 22 and the claw part 100 disposed opposite thereto, and is mounted between adjacent claw parts 100. The magnet 102 is magnetized. When magnetizing, it is necessary to generate a magnetic field so that the N-pole protrusions 22 and the S-pole protrusions 22 are alternately arranged in the circumferential direction. For this reason, the winding directions of the magnetizing coils 30 are made opposite to each other for the adjacent magnetizing coils 30, or the directions of the currents flowing through the magnetizing coils 30 are mutually adjacent. The opposite is necessary.

  As described above, in the magnetizing apparatus 10 of the present embodiment, the shape of the claw portion 100 of the rotor 1 and the shape of the magnetizing yoke 20 facing the rotor 100 are matched to each other so that the magnetizing yoke 20 and the rotor 1 adjacent to each other are matched. The efficiency of magnetization can be improved by eliminating the leakage of the magnetic field generated between the claw portions 100 of the magnet. Each protrusion 22 has a trapezoidal shape at the inner diameter side end, and has a rectangular cross-sectional shape on the outer diameter side from the inner diameter side end. For the magnetized yoke 20, only the tip shape of the protrusion 22 is changed. As a result, design changes can be minimized.

  Further, by winding the magnetizing coil 30 directly around the annular portion 24 of the magnetizing yoke 20, the gap between the magnetizing coil 30 and the magnetizing yoke 20 can be reduced and the magnetizing coil 30 can be reduced. Fixing is facilitated, and the amount of resin used for fixing the magnetizing coil 30 can be reduced to improve the cooling performance. Further, since the three sides of the magnetized coil 30 excluding the inner peripheral side of the annular portion 24 are exposed to the outside, the magnetized coil 30 can easily dissipate heat, and the cooling performance can be further improved. In particular, since the area exposed to the outside of the magnetized coil 30 increases, the exposed portion can be cooled over a wide range by the cooling member 40, and the cooling performance can be further improved. Further, by using a rectangular wire having a rectangular cross section as the magnetizing coil 30, the space factor of the magnetizing coil 30 can be increased, and the magnetizing efficiency can be improved by increasing the current.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the above-described embodiment, a case where a neodymium magnet is used as the magnet 102 has been described, but the type of the magnet 102 may be other than that.

  Further, in the above-described embodiment, each protrusion 22 provided on the magnetizing yoke 20 has a trapezoidal shape at the inner diameter side end 22A and a rectangular cross-sectional shape at the outer diameter side from the inner diameter side end. However, as shown in FIG. 4, the shape (trapezoidal shape) of the end portion on the inner diameter side may be maintained as it is on the outer diameter side.

It is a figure which shows the whole structure of the magnetizing apparatus of one Embodiment. It is a partial perspective view which shows the detailed shape of a magnetizing yoke. It is a fragmentary perspective view which shows the state by which the magnetizing coil was wound by the magnetizing yoke. It is a fragmentary perspective view which shows the shape of the magnetizing yoke of a modification. It is a partial perspective view which shows the shape of the conventional magnetizing yoke. It is a partial perspective view which shows the state by which the magnetizing coil was wound around the conventional magnetizing yoke. It is a perspective view which shows the rotor with which the magnet was mounted | worn. It is a figure which shows the correspondence of the conventional magnetizing yoke and the nail | claw part of a rotor. It is the figure which looked at the A area | region shown in FIG. 8 from the rotating shaft direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor 10 Magnetization apparatus 20 Magnetization yoke 22 Protrusion part 22A Inner diameter side edge part 24 Ring part 30 Magnetization coil 40 Cooling member 100 Claw part 102 Magnet 200, 202 Pole core 210 Rotating shaft

Claims (6)

A magnetizing yoke having a plurality of protrusions whose inner diameter side end portion has a trapezoidal shape in accordance with the shape of the claw portion of the rotor of the rotating electrical machine,
A magnetizing coil wound around the magnetizing yoke;
And magnetizing a magnet mounted between the claw portions by causing a current to flow through the magnetizing coil. In claim 1,
The plurality of protrusions have a trapezoidal shape at an inner diameter side end, and a rectangular cross section at an outer diameter side from the inner diameter side end. In claim 1 or 2,
The magnetized yoke has an annular portion disposed on the outer peripheral side of the plurality of protrusions,
The magnetizing device, wherein the magnetizing coil is wound around the annular portion between the plurality of protrusions arranged in the circumferential direction. In claim 3,
A magnetizing device using a rectangular wire having a rectangular cross section as the magnetizing coil. In claim 3 or 4,
A magnetizing apparatus further comprising a cooling member disposed around the magnetizing coil to cool the magnetizing coil. In claim 5,
The magnetizing device, wherein the cooling member faces three sides of the magnetizing coil located on the outer diameter side and both axial end surfaces of the annular portion.

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