JPH0134530Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a field device for a magnetic rotating electrical machine in which the field pole of a permanent magnet is fixed and held on a yoke.

[Prior art]

Conventionally, as this type of device,
There was something shown in the publication. This conventional field device is shown in FIGS. 1 and 2 as a front view and an enlarged view of the bent portion of the metal plate, and FIG. 3 is a plan view of the metal plate portion. In FIG. 3, protrusions 1 are provided at both ends of both sides of a metal plate 2, and an engaging portion 4 having a slanted cross section is formed by bending and raising a pair of cut grooves 3 on both sides.
The remaining portions on both ends of the projection piece 1 are bent and raised at a substantially right angle from the base of the projecting piece 1 to form a magnet holding part 5, and a hole 6 for a fixing pin is provided in the metal plate 2. At this time, the end of each protruding piece 1 remains extended as shown by the chain line.

The metal plate 2 thus formed is caulked and fixed to the inner surface of the yoke 7 with pins 8, as shown in FIG. Next, the magnets 10 with stepped portions 9 formed on both ends are inserted along the inner surface of the yoke 7 in the axial direction between both metal plates 2, and the magnets 10 are inserted at the tip sides of the F-shaped engaging portions 4, respectively. The magnet 10 is stopped from moving in the circumferential direction by engaging and pressing the stepped portion 9 of the magnet 10 and abutting each magnet clamping portion 5 .

Next, the tip of each protruding piece 1 is bent outward by 90 degrees to form a bent part 11, and is brought into contact with both end surfaces of the magnet 10.
Movement of the magnet 10 in the axial direction is stopped and held. 12 is a rotor.

In the above-mentioned conventional device, the formation of the metal plate 2 was complicated and expensive, and installation was troublesome. Also, magnet 10
This required a structure in which stepped portions 9 were formed on both sides.

[Summary of the idea]

This idea eliminates the drawbacks of the conventional device described above.The field pole is made into a composite structure by gluing a main pole made of a permanent magnet and an auxiliary pole made of steel in the circumferential direction, and the auxiliary pole is placed inside the yoke. Attach it to the peripheral surface using an attachment means, glue the main magnetic pole to the inner peripheral surface of the yoke, insert a U-shaped holding frame between each field pole, press the sides of both field poles with both sides, and Lock the bent protrusion in the middle part to the engagement groove in the middle part on the side surface of the auxiliary pole,
Both ends of the other main magnetic pole are locked with the locking protrusions provided on both ends of the other side, and the main magnetic pole is held on one of the auxiliary poles via the holding frame, making it easy and inexpensive to form the holding frame. It is an object of the present invention to provide a field device for a magnet rotating electrical machine that can be easily inserted and mounted between field poles.

[Example of idea]

FIGS. 4 and 5 are a front view and a view of the upper half of a field device of a magnet rotating electrical machine according to an embodiment of the present invention, as seen from the inside. 21 is a cylindrical yoke, 22
is a composite field pole, which has a composite structure in which a main pole 23 made of a permanent magnet made of ferrite material or the like and an auxiliary pole 24 made of a mild steel material are bonded in the circumferential direction. The auxiliary pole 24 is provided with an engagement groove 24a in the middle of one side thereof, and is attached to the inner surface of the yoke 21 by welding as attachment means. Reference numeral 25 denotes a holding frame made of an elastic thin metal plate and formed into a U-shaped cross section, which is inserted between each field pole 22, with its bottom abutting the inner surface of the yoke 21, and with both sides holding both field poles 2.
The main magnetic pole 23 is fixed to the inner surface of the yoke 21 by elastically pressing the side surface of the yoke 21, and is also fixed in the circumferential direction. The holding frame 25 is held in the engagement groove 24a of one of the auxiliary poles 24 by a bent protrusion 25a that is bent and raised in the circumferential direction at the middle part of one side, and is received in the axial direction. Further, at both ends of the other side of the holding frame 25, a locking protrusion 25b is provided which protrudes from the outer end of the field pole 22, protrudes outward in the circumferential direction, and has a rounded tip. The outer end of the magnetic pole 23 is locked to prevent movement in the axial direction.

The apparatus of the above embodiment is assembled as follows. An auxiliary pole 24 is welded and fixed to the inner peripheral surface of the yoke 21. The main magnetic pole 23 is preliminarily attached to the inner peripheral surface of the yoke 21 and one side of the auxiliary pole 24 with adhesive, and the holding frame 2
5 is inserted between each field pole 22 in the axial direction as shown by arrow B. At this time, the bent protrusion 25a on one side of the holding frame 25 has not yet been bent. The locking protrusion 25b on the other side has a rounded tip, and due to its elasticity, it bends inward and is easily inserted. Therefore, the bent protrusion 25a on one side is formed by bending,
It is locked in the engagement groove 24a of one of the auxiliary poles 24.

FIG. 6 is a view of a field device showing another embodiment of this invention, viewed from the inside. The U-shaped holding frame 26 has a bent protrusion 26a in the middle of one side.
is before bending, and both ends of the other side are extended as shown by chain lines and bent outward by 180 degrees to form a locking protrusion 26b, and each tip is rounded. Each holding frame 26 is inserted between each field pole 22 in the axial direction, and the bent protrusion 26a in the middle of one side is bent and engaged with the engagement groove 24a of one auxiliary pole 24, and both sides of the other side are bent. Both ends of the other main magnetic pole 23 are locked by the projections 26b to ensure axial retention.

Note that the holding frame is made of an elastic thin metal plate, preferably a non-magnetic material, but even a magnetic material such as a steel plate can be used without any problem since leakage of magnetic flux is slight. Further, a spring plate material may be used as the thin metal plate material.

In the above embodiment, the auxiliary pole 24 is attached to the inner circumferential surface of the yoke 21 by welding (skip welding or spot welding), but bolts, tightening screws,
Alternatively, attachment means such as caulking using rivets may be used.

[Effect of idea]

As described above, according to this invention, the field pole has a composite structure in which the main pole of the permanent magnet and the auxiliary pole of the steel product are bonded in the circumferential direction, and the auxiliary pole is attached to the inner circumferential surface of the yoke. Installation: Glue the main magnetic pole to the inner surface of the yoke and the side of the auxiliary pole, insert the holding frame bent into a U shape in the axial direction between each field pole, press the sides of both field poles with both sides, The bent protrusion in the middle of one side locks into the engagement groove of one auxiliary pole, and the locking protrusions protruding from both ends of the other side lock both ends of the other main pole. Since the other main magnetic pole is held by one of the auxiliary poles through the holding frame, the holding frame can be formed easily and inexpensively, and it is easy to insert and attach between the field poles, improving workability. The magnetic poles are reliably held.

[Brief explanation of the drawing]

Figure 1 is a front view showing the field device of a conventional magnetic rotating electric machine, Figure 2 is an enlarged front view of the bent part of the metal plate in Figure 1, and Figure 3 is the metal plate in Figure 1 in direction A. FIG. 4 is an enlarged plan view of the upper half of a field device for a magnetic rotating electrical machine according to an embodiment of the invention;
FIG. 5 is a bottom view of the device shown in FIG. 4, and FIG. 6 is a bottom view corresponding to FIG. 5 of a field device showing another embodiment of this invention. 21...Yoke, 22...Field pole, 23...Main magnetic pole, 24...Auxiliary pole, 24a...Engagement groove, 25...
...Holding frame, 25a...Bending protrusion, 25b...
Locking protrusion, 26...holding frame, 26a...bending protrusion, 26b...locking protrusion, and the same reference numerals in the drawings indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] (1) Composite construction in which a main pole made of a permanent magnet and an auxiliary pole made of steel are adhered in the circumferential direction,
The auxiliary pole is provided with an engagement groove in the middle part of one side and is attached to the inner circumferential surface of the yoke by an attachment means, and the main magnetic pole includes a plurality of field poles bonded to the inner circumferential surface of the yoke, and U made from elastic thin metal plate material
It is bent into a letter shape, and a bent protrusion is formed in the middle part of one side after insertion, and both ends of the other side protrude from the field tip in the axial direction, and in the circumferential direction. A plurality of holding frames are provided with locking protrusions that are bent outwardly and have rounded ends in the axial direction, and each of these holding frames has its bottom between the respective field poles. It is inserted in the axial direction in contact with the inner circumferential surface of the steel, elastically presses the side surfaces of both field poles with both sides, and engages the engagement groove of one of the auxiliary poles with the bent protrusion on the one side in the axial direction. The outer end of the other main magnetic pole is clamped and locked by the locking protrusions at both ends of the other side, and the main magnetic pole is held by the auxiliary pole via the holding frame. A field device for a magnetic DC machine featuring: (2) The field device for a magnetic rotating electric machine as set forth in claim 1 of the utility model registration claim, wherein the locking protrusion of the holding frame is formed by bending outward in the circumferential direction into an arc shape. . (3) The field device for a magnetic rotating electric machine according to claim 1, wherein the locking protrusion of the holding frame is formed by being folded outward in the circumferential direction. (4) The field device for a magnetic rotating electric machine as set forth in any one of claims 1 to 3 of the claims for utility model registration, wherein the holding frame is formed by bending a thin steel plate.