JP6669626B2 - Magnetizing device - Google Patents

Description

  The present invention relates to a magnetizing device.

  A magnetizing device for magnetizing a rotor core mounted on a motor has been developed. Patent Document 1 discloses that a magnetizing device sandwiches a magnetized yoke for magnetizing a rotor core and a peripheral portion of an electromagnetic steel plate of the rotor core from a lamination direction of the electromagnetic steel plates to suppress deformation of the electromagnetic steel plate when magnetized. Means.

JP-A-2005-222744

  As described above, the invention described in Patent Document 1 suppresses deformation of the electromagnetic steel sheet when the rotor core is magnetized. Also in the magnetizing device, it was found that a large force acts on the coil of the magnetized yoke, and dielectric breakdown occurs between the coil and the core of the magnetized yoke.

  The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a magnetizing device capable of suppressing dielectric breakdown between a coil and a core of a magnetizing yoke.

  A magnetizing device according to the present invention includes a core having an insertion hole into which a rotor core is inserted, a coil formed in the core and generating a magnetic field for magnetizing the rotor core, and a position of an end of the coil. A magnet holding yoke having a mold portion defining the position of the core portion, a core holding portion defining the position of the core portion, and a coil end holding portion defining the position of the end portion of the coil portion, and the core holding portion contacts the mold portion. The surface has a concave portion, and a part of the mold portion enters the concave portion to form a convex portion.

  According to the present invention, it is possible to provide a magnetizing device capable of suppressing dielectric breakdown between a coil and a core of a magnetized yoke.

FIG. 7 is a diagram for explaining the overall configuration of a magnetizing device 101 according to a comparative example. FIG. 9 is a diagram for explaining a configuration of a magnetized yoke 110 according to a comparative example. FIG. 2 is a diagram for explaining a configuration of a magnetized yoke 10 according to the embodiment. FIG. 4 is a diagram for explaining a method of forming a mold section 13 according to the present embodiment.

  Hereinafter, with reference to the drawings, according to a magnetizing device according to a comparative example in which dielectric breakdown may occur between the coil and the core of the magnetized yoke, and to the present embodiment capable of suppressing the dielectric breakdown. The magnetizing device will be described in this order.

(Comparative example)
FIG. 1 is a diagram for explaining the overall configuration of a magnetizing device 101 according to a comparative example, and shows a configuration when the magnetizing device 101 is viewed from a horizontal direction. The magnetizing device 101 includes a magnetizing yoke 110 for magnetizing the rotor core 102 and the like.

  FIG. 2 is a diagram for explaining the configuration of the magnetized yoke 110 according to the comparative example. FIG. 2 is an enlarged view of a portion of a range A in FIG. 1, showing a configuration of an upper portion of a magnetized yoke 110.

  The magnetized yoke 110 includes a core portion 111 having an insertion hole (not shown) into which the rotor core 102 is inserted, a coil portion 112 formed in the core portion 111, and a magnetic field generating end portion. , A “coil end”), a mold portion 113 for regulating the position of the core, a core holding portion 114 for regulating the position of the core portion 111, a coil end holding portion 115 for regulating the position of the coil end, and a coil. A bolt 116 for fixing the end holding portion 115 to the core holding portion 114, a bolt 117 for fixing the core holding portion 114 to the core portion 111, and the like are provided.

  The magnetizing yoke 110 having such a configuration generates a large magnetic field when magnetizing the rotor core. At this time, an expansion force (hoop force) 131 that tends to round the coil portion 112 due to the high magnetic field acts in the axial direction. Then, the coil portion 112 is moved by the expansion force 131, and the insulating film of the coil portion 112 is worn by the coil rubbing at the end of the core portion 111 (for example, the portion in the range B in FIG. 2), and the core portion 111 and the coil Insulation breakage may occur between the portion and the portion 112.

That is, the load 132 is applied to the coil end pressing portion 115 by the expansion force 131, whereby the entire coil end moves, the coil portion 112 moves, and the coil may be rubbed at the end of the core portion 111.
Further, the point of force 135 in the mold portion 113 is located at the position of the load 132 applied to the coil end holding portion 115, and the bending moment applied to the bolts 116 and 117 is large.

(This embodiment)
Therefore, in the magnetizing device according to the present embodiment, in order to disperse the load applied to the coil end holding portion and to reduce the bending moment applied to the two bolts, the surface where the core holding portion and the mold portion are in contact with each other, A concave portion is provided in the core pressing portion, and the mold portion enters the concave portion to form a convex portion, so that the core pressing portion and the mold portion are engaged with each other, and the load applied to the coil end pressing portion is also applied to the core pressing portion. The bending moment applied to the two bolts is also reduced.

  FIG. 3 is a diagram for explaining the configuration of the magnetized yoke 10 according to the present embodiment. The overall configuration of the magnetizing device according to the present embodiment is substantially the same as that of the magnetizing device 101 according to the comparative example, and illustration and description thereof are omitted here. FIG. 3 is also an enlarged view of a portion corresponding to the range A in FIG. 1, and shows the configuration on the coil end side of the upper part of the magnetized yoke 10.

  The magnetized yoke 10 also includes the core portion 11, the coil portion 12, the mold portion 13, the core pressing portion 14, the coil end pressing portion 15, the bolts 16 and 17, and the like. When a concave portion 18 which is depressed in the outer diameter direction is provided and the mold portion 13 is formed, the mold enters the concave portion 18 and the convex portion 19 is formed in the mold portion 13.

  According to such a configuration, even when the coil expansion force 31 acts in the axial direction when magnetizing, the protrusion 19 of the mold portion 13 is hooked on the recess 18 of the core pressing portion 14 and the coil expansion force 31 Are distributed to a load 32 applied to the coil end holding portion 15 and a load 33 applied to the core holding portion 14. At this time, by making the recess 18 large, the load 32 applied to the coil end holding portion 15 can be further reduced.

Also, the point of force 35 in the molded portion 13 approaches the bolt 16 or the bolt 17 side, and the bending moment applied to the bolt 16 or the bolt 17 can be reduced.
In addition, the amount of movement of the entire coil end, that is, the movement of the coil portion 12 can be reduced, and deterioration of insulation due to coil rubbing at the end of the core portion 11 can be suppressed.

  The concave portion 18 of the core pressing portion 14 according to the present embodiment is provided with a taper (inclined portion) 20 on the bottom surface or side surface forming the concave portion 18, and is filled with resin to form the mold portion 13. Occasionally, voids can be prevented from remaining in the mold portion 13.

FIG. 4 is a view for explaining a method of forming the mold section 13 according to the present embodiment.
When forming the mold part 13, as shown in FIG. 4, the magnetized yoke 10 during manufacture is turned upside down, that is, with the coil end side down, and the resin filling hole (shown in FIG. )) And inject the resin downward. At this time, even if the air 21 is contained in the resin, the air 21 escapes upward along the taper 20 on the upper surface of the concave portion 18, so that the air 21 does not accumulate in the mold portion 13, And a mold part 13 having sufficient strength can be formed.

  As described above, the magnetizing device according to the present embodiment generates the magnetic field for magnetizing the rotor core formed on the core portion 11 and the core portion 11 having the insertion hole into which the rotor core is inserted. A coil part 12, a mold part 13 for defining the position of the end of the coil part 12, a core holding part 14 for defining the position of the core part 11, and a coil end holding part for defining the position of the end of the coil part 12 The core holding portion 14 has a concave portion 18 on a surface in contact with the mold portion 13, and a part of the mold portion 13 enters the concave portion 18 to form a convex portion 19. .

  With such a configuration, dielectric breakdown between the coil part 12 and the core part 11 of the magnetized yoke 10 can be suppressed.

DESCRIPTION OF SYMBOLS 10 Magnetization yoke 11 Core part 12 Coil part 13 Mold part 14 Core holding part 15 Coil end holding part 16, 17 Bolt 18 Depression 19 Convex part 20 Taper 21 Air 31 Coil expanding force 32, 33 Load 35 Power point

Claims (1)

A core portion having an insertion hole into which the rotor core is inserted,
A coil unit formed on the core unit and generating a magnetic field for magnetizing the rotor core;
A mold part that defines the position of the end of the coil part,
A core presser that defines the position of the core,
A coil end holding portion that defines the position of the end of the coil portion ;
A first bolt for fixing the coil end holding portion to the core holding portion;
A second bolt for fixing the core holding portion to the core portion;
A magnetized yoke having
The core pressing portion has a concave portion on a surface in contact with the mold portion, a part of the mold portion enters the concave portion to form a convex portion ,
The recess reaches almost immediately below the first bolt;
Magnetizer.

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