JP7026082B2 - Magnetized yoke - Google Patents

Description

The present invention relates to a magnetizing yoke used in a magnetizing device that magnetizes a magnet.

As an example of a magnetizing device that magnetizes a magnet, a magnetizing yoke having a winding wound around an iron core is placed close to the magnet to be magnetized, and a pulse current is passed through the winding to make the magnetizing yoke. A magnetizing device that generates a strong magnetic field and applies a magnetic field to the magnet to magnetize the magnet is known. In the magnetizing yoke used in such a magnetizing device, an extremely large pulse current repeatedly flows through the winding, so that the coating of the winding tends to be thermally deteriorated. Furthermore, in the winding of the magnetizing yoke, a force in one direction acts when a current flows, and a force in the opposite direction acts when the current is cut off, so that mechanical deterioration of the coating occurs every time a pulse current is passed. .. Therefore, in many cases, the failure of the magnetizing yoke causes the coating of the winding to gradually deteriorate due to repeated magnetizing, and finally the coating of the winding breaks down to cause a short-circuit failure.

As an example of the conventional technique for reducing the failure caused by the dielectric breakdown of the winding coating and improving the durability of the magnetized yoke, the iron core and the winding are filled with a resin such as epoxy resin for molding. The magnetized yoke is known (see, for example, Patent Document 1). According to the magnetizing yoke having such a configuration, the force acting on the winding when the pulse current flows is relaxed by the resin, so that the mechanical deterioration of the winding coating can be reduced. Further, in order to reduce the possibility that the resin formed around the iron core and the winding will be damaged by the force acting on the winding, a magnetizing yoke having an uneven end face plate in contact with the resin is known (for example, Patent Document). See 1).

Japanese Unexamined Patent Publication No. 2014-096897

In recent years, there has been an increasing need for a magnetizing yoke capable of magnetizing a larger and stronger magnet, such as a rotor (rotor) of a motor of an electric vehicle. In such a magnetized yoke, a larger pulse current needs to flow through the winding, so that the force acting on the winding when the pulse current flows is greater, thereby filling the iron core and around the winding. A large force acts on the molded resin. Also, in such a magnetized yoke, a thicker winding is inevitably required because a larger current needs to flow through the winding. As the winding becomes thicker, it becomes difficult to wind the winding with a small bending radius, so that the bending radius of the winding inevitably increases, which tends to create a space between the bent portion of the winding and the iron core. The greatest force acts on the bent portion of the winding (particularly the boundary portion between the bent portion of the winding and the straight portion). Therefore, when the space between the bent portion of the winding and the iron core becomes large, the force acting on the winding when a pulse current is passed can be suppressed only by the resin filled and molded around the iron core and the winding. It's getting harder.

For this reason, simply filling the iron core and windings with resin and molding them is sufficient to deteriorate the coating of the windings in order to construct a magnetizing yoke that can magnetize a larger and stronger magnet. It cannot be suppressed, and there is a risk that practical durability cannot be obtained. Further, since the space between the bent portion of the winding and the iron core is narrow, it may be difficult to fill the resin. Therefore, the conventional magnetized yoke may be in a state where the resin is not filled, which may greatly reduce the durability.

The present invention has been made in view of such a situation, and an object thereof is to provide a magnetized yoke having higher durability.

<First aspect of the present invention>
A first aspect of the present invention is around a winding, a hole for accommodating the winding, an iron core in which the teeth around which the winding is wound are alternately formed in the circumferential direction, and around the iron core and the winding. It is a magnetized yoke including a resin that is filled and molded, and a winding support portion that is provided in a space between the bent portion of the winding and the iron core and supports the winding.

According to the first aspect of the present invention, the movement of the bent portion of the winding on which the maximum force acts when a pulse current is passed through the winding can be suppressed by the winding support portion, and thus the winding in particular. It is possible to effectively suppress the mechanical deterioration of the bent portion of the winding where the dielectric breakdown of the coating is likely to occur. Further, there are no restrictions on the shape of the iron core or the like in designing the shape of the iron core or the like so that optimum magnetism can be performed according to the shape or the like of the magnet to be magnetized. Therefore, according to the first aspect of the present invention, there is an effect that a magnetizing yoke having higher durability can be provided without lowering the magnetizing efficiency.

<Second aspect of the present invention>
A second aspect of the present invention is, in the first aspect of the present invention described above, the winding support portion is a magnetized yoke made of a material having higher strength than the resin.
According to the second aspect of the present invention, the movement of the bent portion of the winding, which exerts the maximum force when a pulse current is passed through the winding, can be effectively suppressed with higher strength, and thus further. Durability can be improved.

<Third aspect of the present invention>
A third aspect of the present invention is, in the first aspect or the second aspect of the present invention described above, the winding support portion is a magnetized yoke formed of an insulator.
According to the third aspect of the present invention, since the eddy current loss does not occur in the winding support member, it is possible to reduce the possibility that the magnetizing efficiency is lowered due to the eddy current loss.

<Fourth aspect of the present invention>
A fourth aspect of the present invention is that in the first aspect of the present invention described above, the winding support portion is a part of the iron core.
According to the fourth aspect of the present invention, since the winding support portion and the iron core can be made of a common material, it is possible to reduce the manufacturing cost of the magnetized yoke.

<Fifth aspect of the present invention>
A fifth aspect of the present invention is that in any one of the first to fourth aspects of the present invention described above, the winding support portion has a contact portion in contact with the inner peripheral surface of the bent portion of the winding. A magnetized yoke having a curved surface along the inner peripheral surface of the bent portion of the winding.
According to the fifth aspect of the present invention, the inner peripheral surface of the bent portion of the winding is in surface contact with the winding support member instead of the point contact, so that the bent portion of the winding and the winding support member are in surface contact with each other. The force acting on the contacting part is dispersed. As a result, mechanical deterioration of the bent portion of the winding can be suppressed more effectively, so that the durability can be further improved.

<Sixth Embodiment of the present invention>
A sixth aspect of the present invention is, in the fifth aspect of the present invention described above, from the center of the virtual circle inscribed or circumscribed to the contact portion of the winding support portion to the center of the contact portion of the winding support portion. The angle between the line segment of No. 1 and the line segment passing through the center of the virtual circle and parallel to the front surface of the tooth is 40 degrees or more and 50 degrees or less.
According to the sixth aspect of the present invention, it is possible to keep the sliding between the winding and the winding support portion within a small angle range due to the vibration of the winding. Furthermore, it becomes possible to secure a space for filling the resin between the winding and the winding support portion, and it is possible to alleviate the force acting on the winding and reduce the mechanical deterioration of the winding coating. can.

According to the present invention, it is possible to provide a magnetized yoke having higher durability.

The front view which illustrated the main part of the magnetizing yoke which concerns on this invention. The wiring diagram of the winding of the magnetizing yoke which concerns on this invention. FIG. 3 is a cross-sectional view of a main part which is an enlarged view of a part of the magnetizing yoke of the first embodiment. FIG. 2 is a cross-sectional view of a main part which is an enlarged view of a part of the magnetizing yoke of the second embodiment. FIG. 3 is a cross-sectional view of a main part which is an enlarged view of a part of the magnetizing yoke of the third embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
It is needless to say that the present invention is not particularly limited to the examples described below, and various modifications can be made within the scope of the invention described in the claims.

FIG. 1 is a front view illustrating a main part of a magnetizing yoke according to the present invention. FIG. 2 is a wiring diagram of the winding 21 of the magnetizing yoke according to the present invention.

The magnetizing yoke according to the present invention includes a magnetizing yoke main body 10, a winding 21, and a resin 22, which are iron cores. The magnetizing yoke according to the present invention is used in a magnetizing device that generates a strong magnetic field by passing a pulse current through the winding 21 and applies a magnetic field to the magnet of the work 30 to magnetize the magnet.

The magnetizing yoke main body 10 has a cylindrical shape having a circular through hole 11 in which the magnetizing work 30 is arranged. The work 30 is, for example, a rotor (rotor) of a motor. The magnetizing yoke body 10 includes a plurality of slots 12 and a plurality of teeth 13 formed alternately at equal intervals in the circumferential direction thereof. The plurality of slots 12 are holes in which the windings 21 are accommodated, and are through holes penetrating the magnetizing yoke body 10 in the axial direction. The plurality of teeth 13 are portions around which the winding 21 is wound, and are formed so as to have a one-to-one correspondence with the magnet of the work 30. The size and shape of the magnetizing yoke body 10, the size and shape of the through hole 11, and the positions, sizes, and shapes of the slots 12 and teeth 13 are set so that the magnet of the work 30 (not shown) can be magnetized most efficiently (not shown). It is set according to the position, size, shape, etc. of the magnet of the work 30 so that the magnetic flux enters perpendicular to the magnet).

The winding 21 is an electric wire with an insulating coating. The windings 21 wound around the plurality of teeth 13 through the plurality of slots 12 are connected in series, and are alternately reversed so that the N-pole magnetic field and the S-pole magnetic field are alternately generated in the plurality of teeth 13. It is wound around a plurality of teeth 13 in the winding direction of. A power supply device (not shown) that generates a pulse current is connected to both ends of the winding 21. The thickness of the electric wire of the winding 21 and the material and thickness of the coating are set according to, for example, the required magnetic force and the magnitude of the pulse current flowing through the winding 21. Further, the number of turns of the winding 21 in each tooth 13 is set according to the energization time of the pulse current flowing through the winding 21, the peak current value, and the like.
Although not shown, it is preferable to provide a sheet-like insulating paper or the like made of an insulating material between the adjacent windings 21 and between the windings 21 and the slot 12.

The resin 22 is, for example, an epoxy resin, and is filled and molded around the magnetizing yoke main body 10 and the winding 21. After the resin 22 is filled and molded, the magnetized yoke is in a state where most of the winding 21 and the magnetized yoke main body 10 are covered with the resin 22. If the strength of the resin 22 (for example, tensile strength, etc.) is too high, cracks are likely to occur, and if it is too low, the force acting on the winding 21 cannot be suppressed. That is, the strength of the resin 22 is appropriately set according to the specifications of the magnetizing yoke and the like.

<First Example>
FIG. 3 is an enlarged cross-sectional view of a part of the magnetizing yoke according to the present invention of the first embodiment.

The magnetized yoke according to the present invention further includes a winding support member 23 that functions as a winding support portion that supports the winding 21. The winding support member 23 is provided in the space 212 between the bent portion 211 of the winding 21 and the teeth 13. As shown in the figure, the bent portion 211 of the winding 21 is a portion of the winding 21 that is bent into a U shape. The winding support member 23 is, for example, a plate-shaped member having a certain thickness, and is formed of an insulator. More specifically, the winding support member 23 is made of a polyamide resin such as a baking material (phenol resin) or MC nylon (registered trademark), and is provided on each of the plurality of teeth 13. The winding support member 23 is provided on the front surface 131 and the rear surface of each tooth 13. Further, insulating paper 24, which is a sheet-like member made of an insulating material, is provided in the gap between the winding 21 and the teeth 13 and between the winding 21 and the winding support member 23. ing.

By providing the winding support member 23 in the space 212 between the bent portion 211 and the teeth 13 of the winding 21 in this way, the winding 21 on which the largest force acts when a pulse current is passed through the winding 21. The movement of the bent portion 211 can be suppressed by the winding support member 23. As a result, deterioration of the bent portion 211 of the winding 21, which is particularly prone to dielectric breakdown, can be effectively suppressed. Further, in designing the shape of the magnetizing yoke main body 10 so that optimum magnetism can be performed according to the shape of the work 30 to be magnetized, there are no restrictions on the shape of the magnetizing yoke main body 10 or the like. Therefore, according to the present invention, it is possible to provide a magnetizing yoke having higher durability without lowering the magnetizing efficiency.

The winding support member 23 is preferably made of a material having higher strength (for example, tensile strength) than the resin 22. As a result, the movement of the bent portion 211 of the winding 21 on which the largest force acts when a pulse current is passed through the winding 21 can be effectively suppressed with higher strength, so that the durability of the magnetized yoke can be improved. It can be further improved. Further, the material of the winding support member 23 may be, for example, a non-magnetic material, but if a metal is used, an eddy current flows to generate heat, and a loss (eddy current loss) occurs. Therefore, the winding support member 23 is preferably formed of an insulator, whereby the possibility that the magnetizing efficiency is lowered due to the eddy current loss can be reduced.

Further, as shown in the drawing, the winding support member 23 has a curved surface shape in which the contact portion 231 in contact with the inner peripheral surface of the bent portion 211 of the winding 21 is along the inner peripheral surface of the bent portion 211 of the winding 21. Is preferable. For example, the bending radius of the bent portion 211 of the winding 21 is determined according to the thickness of the winding 21. The shape of the winding support member 23 is set to an appropriate curved surface shape according to, for example, the bending radius of the bending portion 211 of the winding 21. By forming the winding support member 23 in such a shape, the inner peripheral surface of the bent portion 211 of the winding 21 comes into surface contact with the winding support member 23 instead of point contact, and the winding 21 is bent. The force acting on the portion where the portion 211 and the winding support member 23 are in contact with each other is dispersed. As a result, deterioration of the bent portion 211 of the winding 21 can be suppressed more effectively, so that the durability can be further improved.

Then, a line segment L1 from the center O of the virtual circle S circumscribing the contact portion 231 of the winding support member 23 to the center M of the contact portion 231 of the winding support member 23, and the teeth passing through the center O of the virtual circle S. It is preferable that the angle formed by the line segment L2 parallel to the front surface 131 of 13 is 40 degrees or more and 50 degrees or less. In particular, it is more preferable that the angle formed is 45 degrees. This makes it possible to keep the sliding between the winding 21 and the winding support member 231 due to the vibration of the winding 21 within a small angle range. Further, it becomes possible to secure a space for filling the resin between the winding 21 and the winding support member 231 to alleviate the force acting on the winding 21 and mechanically deteriorate the coating of the winding 21. Can be reduced.

The virtual circle O may be a circle inscribed as well as a circle circumscribed in the contact portion 231 of the winding support member 23. Even when such a virtual circle O is inscribed, the length of the line segment L1 changes and the position of the line segment L2 only shifts in parallel, so that the angles formed are the same.

<Second Example>
FIG. 4 is an enlarged cross-sectional view of a part of the magnetizing yoke according to the present invention of the second embodiment.
The magnetized yoke of the second embodiment is different from the first embodiment in that the winding support member 23 is made of metal. Since the other configurations are the same as those in the first embodiment, detailed description thereof will be omitted. As described above, in the magnetized yoke according to the present invention, the winding support member 23 can be formed of metal, and the effect of the present invention can be obtained even in such an embodiment.

<Third Example>
FIG. 5 is an enlarged cross-sectional view of a part of the magnetizing yoke according to the present invention of the third embodiment.
The magnetized yoke of the third embodiment is not provided with the winding support member 23 of the first embodiment, and supports the winding 21 by the space 212 between the bent portion 211 of the winding 21 and the teeth 13. The winding support portion 131 is formed on the teeth 13. That is, the winding support portion 131 is formed as a part of the magnetized yoke main body 10 (teeth 13) which is an iron core. The winding support portion 131 is provided on the front surface and the rear surface of each tooth 13. Further, in the gap between the winding 21 and the teeth 13, an insulating paper 24, which is a sheet-like member made of an insulating material, is provided. Since the configurations other than the above are the same as those in the first embodiment, detailed description thereof will be omitted.

When the winding support portion 131 that supports the winding 21 is formed in the teeth 13 in the space 212 between the bent portion 211 and the teeth 13 of the winding 21 in this way, a pulse current is passed through the winding 21. The movement of the bent portion 211 of the winding 21 on which the largest force acts can be suppressed by the winding support portion 131. As a result, the magnetized yoke of the third embodiment can effectively suppress the deterioration of the bent portion 211 of the winding 21 which is particularly prone to dielectric breakdown, and thus has higher durability as in the first embodiment. A high magnetizing yoke can be provided. Further, in the magnetized yoke of the third embodiment, the winding support portion 131 that supports the winding 21 in the space 212 between the bent portion 211 of the winding 21 and the teeth 13 is formed as a part of the teeth 13. Therefore, for example, even when the space 212 between the bent portion 211 of the winding 21 and the teeth 13 is narrow and it is difficult to insert the winding support member 23 of the first embodiment between them, the wearing has higher durability. A magnetic yoke can be provided.

Further, as shown in the figure, the winding support portion 131 of the third embodiment has a curved surface shape in which the contact portion 132 in contact with the inner peripheral surface of the bent portion 211 of the winding 21 is along the inner peripheral surface of the bent portion 211 of the winding 21. It is preferable that it is. For example, the bending radius of the bent portion 211 of the winding 21 is determined according to the thickness of the winding 21. The shape of the winding support portion 131 is set to an appropriate curved surface shape according to, for example, the bending radius of the bending portion 211 of the winding 21. By forming the winding support portion 131 in such a shape, the inner peripheral surface of the bent portion 211 of the winding 21 comes into surface contact with the winding support portion 131 instead of point contact, and the winding 21 is bent. The force acting on the portion where the portion 211 and the winding support portion 131 are in contact with each other is dispersed. As a result, deterioration of the bent portion 211 of the winding 21 can be suppressed more effectively, so that the durability can be further improved.

Further, since the winding support portion 131 of the third embodiment is formed as a part of the magnetized yoke main body 10 which is an iron core, the material of the winding support portion 131 and the magnetized yoke main body 10 can be standardized. Therefore, the manufacturing cost of the magnetized yoke itself can be reduced.

Also in the third embodiment, as in the first embodiment, the winding support portion 131 is located from the center (not shown) of the virtual circle (not shown) externally attached to the contact portion 132 of the winding support portion 131. A line segment (not shown) to the center of the contact portion 132 (not shown) and a line segment passing through the center of the virtual circle and parallel to the front surface of the teeth 13 (front surface of the winding support portion 131) (shown). It is preferable that the angle formed with (1) is 40 degrees or more and 50 degrees or less, and it is more preferable that the angle formed with the object is 45 degrees. This makes it possible to keep the sliding between the winding 21 and the winding support portion 131 due to the vibration of the winding 21 within a small angle range. Further, it becomes possible to secure a space for filling the resin between the winding 21 and the winding support portion 131, alleviating the force acting on the winding 21 and mechanically deteriorating the coating of the winding 21. Can be reduced.

10 Magnetized yoke body (iron core)
11 Through hole 12 Slot 13 Teeth 131 Winding support 21 Winding 22 Resin 23 Winding support member 24 Insulating paper

Claims (6)

Insulated windings and
A hole for accommodating the winding and an iron core in which the teeth around which the winding is wound are alternately formed in the circumferential direction.
A resin filled and molded around the iron core and the winding
It is provided in a semicircular space created by the bending radius of the winding between the bent portion bent in a U shape of the winding and the end face in the axial direction of the iron core, and the movement of the winding when energized. A magnetized yoke comprising a winding support portion that supports the winding so as to suppress the above. The magnetizing yoke according to claim 1, wherein the winding support portion is made of a material having a strength higher than that of the resin. The magnetizing yoke according to claim 1 or 2, wherein the winding support portion is formed of an insulator. In the magnetized yoke according to claim 1, the winding support portion is a magnetized yoke that is a part of the iron core. In the magnetized yoke according to any one of claims 1 to 4, in the winding support portion, the contact portion in contact with the inner peripheral surface of the bent portion of the winding is the inner circumference of the bent portion of the winding. A magnetized yoke that has a curved surface along the surface. In the magnetizing yoke according to claim 5, a line segment from the center of a virtual circle inscribed or circumscribed to the contact portion of the winding support portion to the center of the contact portion of the winding support portion, and the virtual. A magnetized yoke having an angle of 40 degrees or more and 50 degrees or less with a line segment passing through the center of a circle and parallel to the front surface of the tooth.

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