JPH0140307Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a field device in a magnet motor with auxiliary magnetic poles, and particularly relates to the arrangement groove structure of the auxiliary magnetic poles.

[Conventional technology]

Conventionally, in a field device for a magnet motor with auxiliary magnetic poles, bosses 2, 2 are formed inside a cylindrical yoke 1, and a permanent magnet 3 is placed between the bosses 2, 2, as shown in FIG. The auxiliary magnetic pole 4 is placed and positioned, and is fixed to the inner circumferential surface of the yoke 1 with adhesive, and the auxiliary magnetic pole 4 is brought into contact with the side surface of the permanent magnet 3 to align the position, and the auxiliary magnetic pole 4 is fixed to the inner circumferential surface of the yoke 1 with adhesive. It was something that stuck to the surface.

[The problem that the idea aims to solve]

Such field devices had the following problems.

When fixing the auxiliary magnetic pole with adhesive, since there was no positioning part, it was necessary to use a special jig to hold it down until it hardened.

The rotor that is inserted and assembled hits the exposed corners of the permanent magnets, easily causing cracks or chips.

If stress is applied to the yoke due to an external impact such as dropping the motor or a flying stone, the permanent magnets and auxiliary magnetic poles fixed to the inner circumferential surface may peel off, or the permanent magnets may crack or chip, causing the yoke to fall off. Ta.

[Means to solve problems]

The present invention consists of a cylindrical yoke, a pair of resin holders arranged on both sides of the yoke, and a plurality of permanent magnets and permanent magnets sandwiched between the holders and arranged on the inner peripheral surface of the yoke. The holder is a magnetic motor having the same number of auxiliary magnetic poles as the yoke, and has a plurality of bent parts on both sides of the yoke to press and fix the holder. A plurality of protrusions protruding in the axial direction are integrally molded, and a positioning groove is formed on the outer periphery of the base of the holder to engage with the cut and bent portion of the yoke, and the protrusions of the holder move the permanent magnet inward. It is characterized by comprising a base portion that is held in the base portion, and a tip portion that is provided approximately in the center of the base portion and that forms a recess into which the auxiliary magnetic pole is inserted with the circumferential side surfaces of the permanent magnet on both sides of the base portion.

[Effect]

With this configuration, the permanent magnet and the auxiliary magnetic pole can be held and positioned in the axial direction via the holder, and a dedicated holding jig is not required. Furthermore, by making the thickness of the holder slightly thicker than the thickness of the permanent magnet, the rotor does not come into contact with the permanent magnet when the rotor is assembled, thereby preventing the permanent magnet from chipping or cracking. The annular base of the holder acts as a hoop to hold down each permanent magnet and auxiliary magnetic pole and strengthens them integrally, suppressing deformation of the yoke due to external impact etc. and preventing cracking or peeling of the magnets. Furthermore, recesses are formed on both sides of the tip of the holder, making it possible to handle cases where the position of the auxiliary magnetic pole relative to the permanent magnet differs depending on whether the motor rotates clockwise or counterclockwise.

〔Example〕

An embodiment of the present invention will be described based on the drawings. 1st
The figure shows a field device for a magnet motor with auxiliary magnetic poles according to the present invention, in which 1 is a cylindrical yoke, and at both ends there are cut and bent parts for positioning and holding permanent magnets and auxiliary magnetic poles via holders, as will be described later. A suitable number of sections 8 are provided. Reference numeral 3 denotes permanent magnets for a field fixed to the inner circumferential surface of the yoke 1, and four permanent magnets are used in this embodiment. Reference numeral 4 indicates auxiliary magnetic poles provided adjacent to the permanent magnets 3, which are used in the same number as the permanent magnets 3. Reference numeral 5 designates a holder made of resin, in which an annular base body 6 and a convex projection 7 protruding from the base body 6 in the axial direction are integrally formed. The base body 6 has an outer diameter that is approximately the same as the inner diameter of the yoke 1, and is inserted into the yoke 1. A positioning groove 9 is formed on the outer periphery of the base body 6 so that it engages with the bent portion 8 of the yoke 1. position. The protrusions 7 of the holder 5 are formed in the same number as the permanent magnets 3, and the protrusions 7 are formed in the same number as the permanent magnets 3.
The tip portion 11 has a smaller width in the circumferential direction. The circumferential width between the adjacent base portions 10, 10 is approximately the same as the circumferential width of the permanent magnet 3, so that the permanent magnet 3 can be held therebetween. Further, the tip portion 11 is formed approximately at the center of the base portion 10, and the tip portion 11
The auxiliary magnetic pole 4 can be disposed in a recess 12 formed by the side surface of the permanent magnet 3 on both sides of the tip 11. The thickness of the holder 5 is that of the permanent magnet 3
The thickness of the permanent magnet 3 is set to be thicker than that of the permanent magnet 3, so that when a rotor (not shown) is installed, the rotor does not come into direct contact with the corner of the permanent magnet 3.

Next, assembly will be explained.

The holder 5 coated with adhesive in advance is inserted into one end of the yoke 1, and the cut and bent portion 8 of the yoke 1 and the holder 5 are
and the positioning groove 9 of. As a result, one of the holders 5 and the yoke 1 are positioned. Next, adhesive is applied to the permanent magnet 3 and the auxiliary magnetic pole 4, and the permanent magnet 3 is attached to the base 10 of the protrusion 7 of the holder 5,
10 and formed by the side surface of this permanent magnet 3 and the tip 11 of the protrusion 7 of the holder 5.
The auxiliary magnetic pole 4 is attached to the side surface of the permanent magnet 3 and held. The yoke 1, permanent magnet 3, and auxiliary magnetic pole 4 are now positioned. In this case, the recesses 12 are formed on both sides of the tip 11, but they can be selected as appropriate depending on the rotational direction of the motor. moreover,
Insert a holder 5 of the same shape coated with adhesive into the other end of the yoke 1, sandwich the permanent magnet 3 and the auxiliary magnetic pole 4, and fit the other end of the yoke 1 into the positioning groove 9 of the holder 5. The permanent magnet 3 and the auxiliary magnetic pole 4 are pressed and fixed via the holders 5, 5. Finally, a plate spring-like holding jig is inserted inside the permanent magnet 3 and the auxiliary magnetic pole 4 and left in a high temperature atmosphere to harden the applied adhesive.

〔effect〕

As described in detail above, one type of holder can support both clockwise and counterclockwise rotation of the motor, improving productivity, preventing cracking and chipping of the magnet, and providing a high-quality field device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a field device for a magnet motor with auxiliary magnetic poles according to the present invention. FIG. 2 is a perspective view of a conventional field device for a magnet motor with auxiliary magnetic poles. Explanation of symbols, 1: Yoke, 2: Boss, 3: Permanent magnet, 4: Auxiliary magnetic pole, 5: Holder, 6: Base,
7: Protrusion, 8: Cutting and bending part, 9: Positioning groove, 1
0: base, 11: tip, 12: recess.

Claims (1)

[Scope of utility model registration request] A cylindrical yoke 1, a pair of resin holders 5 disposed on both sides of this yoke 1, and this holder 5.
A magnetic motor having a plurality of permanent magnets 3 sandwiched between them and disposed on the inner circumferential surface of a yoke 1 and auxiliary magnetic poles 4 of the same number as the permanent magnets 3, in which a holder 5 is pressed and fixed on both sides of the yoke 1. The holder 5 has a circular base body 6 inserted into the inner periphery of the yoke 1 and a plurality of protrusions 7 protruding from the base body 6 in the axial direction, which are integrally molded.
Furthermore, a positioning groove 9 is formed on the outer periphery of the base 6 of the holder 5 to engage with the cut and bent portion 8 of the yoke 1, and the protrusion 7 of the holder 5 has a base 10 that holds the permanent magnet 3 in the circumferential direction. A magnet with an auxiliary magnetic pole, which is provided approximately at the center of the base 10 and has a tip portion 11 that forms a recess 12 in which an auxiliary magnetic pole 4 is inserted with the circumferential side surfaces of the permanent magnet 3 on both sides of the base 10. Motor field device.