JPS6260451A - Permanent-magnet field disk type synchronous machine - Google Patents

Abstract

PURPOSE:To bond permanent magnets firmly to a rotor by disposing a plurality of the fan-shaped permanent magnets at the predetermined positions of the discoid rotor while N pole and S poles are alternately arranged through a ferromagnetic body. CONSTITUTION:A plurality of (an even numbered) fan-shaped windows are formed to the circumferential sections of two discoid rotors 15 to which a shaft 1 is fitted, and permanent magnets 3 are inserted. The fan shapes 3' of oppositely faced surfaces in the rotors 15 are made slightly larger than the permanent magnets 3. Ferromagnetic bodies 20 are inserted into the fan shapes 3' and held by the two rotors 15, and the fan-shaped permanent magnets 3 are arranged on both sides of the ferromagnetic bodies 20 while N poles and S poles are alternately disposed, and bonded with the ferromagnetic bodies 20 by adhesives. Accordingly, the permanent magnets 3 are bonded firmly with the rotors 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a permanent magnet field disk type synchronous machine used in various actuators for industrial equipment and the like.

[Conventional technology]

Such a synchronous machine has conventionally been used, for example, as shown in FIGS. 5 and 6. In this figure, 1 is a rotating shaft, and 2 is a rotor fixed to the rotating shaft 1. The rotor 2 is formed into a disk shape as shown in FIG. 6, and permanent magnets 3 are arranged on both sides of the rotor 2, alternating S and N poles. The permanent magnets 3 are fan-shaped and are arranged radially around the rotating shaft 1 at approximately equal intervals.
It is fixed to the rotor 2 by adhesive. 5 is a stator core, and 6 is an armature, each of which maintains a slight clearance with respect to the rotor 2. γ is the housing, and is fixed to the pole 9 with the spacer 8 sandwiched therebetween.

Fins 10 for heat radiation are formed on the outer surface of the housing T. (SAE Paper 83 [Problems to be Solved by the Invention]) In such a synchronous machine, the permanent magnet follows the rotating magnetic field formed by the armature, and the rotor rotates.By the way, the permanent magnet is fixed to the rotor by adhesive. Because of this, the heat from long-term use may deteriorate the bond and cause the permanent magnets to be pulled out of the rotor.In such a case, depending on the clearance between the rotor and the armature, the permanent magnets pulled out from the rotor may be pulled out of the rotor. There is a problem that contact may occur and damage the armature.

Therefore, an object of the present invention is to securely fix the permanent magnets to the rotor.

〔problem? Means to solve]

In order to solve the above-mentioned problems and achieve the objects, the present invention provides a permanent magnet field disk type synchronous machine in which a plurality of permanent magnets are arranged in a disk-shaped rotor. A ferromagnetic material is fixed, and a permanent magnet is fixed to the rotor via the ferromagnetic material.

[Effect]

The attractive force of the permanent magnet acts more strongly on the ferromagnetic body fixed to the a-sunset body than on the nine armatures separated by a predetermined clearance.

Therefore, the permanent magnet is firmly bonded to the ferromagnetic material and is securely fixed to the rotor.

〔Example〕

1 and 2 show an embodiment of a permanent magnet field disk type synchronous machine according to the present invention. 1 is a rotating shaft;
Reference numeral 15 denotes a disk-shaped rotor to which this rotating shaft IK is fixed. The rotor 15 is divided into two parts perpendicularly to the rotating shaft 1, and fan-shaped holes into which the permanent magnets 3t are inserted are formed at predetermined locations where the permanent magnets 3 are to be installed. 20 is a ferromagnetic material such as silicon steel. This ferromagnetic material 20 has a fan shape that is slightly larger than the fan-shaped hole, and its peripheral edge portion is held at the joint portion of the rotor 15 at the periphery of the hole. The permanent magnet 3 is fitted into the hole on both sides of the ferromagnetic material 20 fixed to the rotor 15 so as to be in contact with the ferromagnetic material 20, thereby being fixed to the rotor 15. When fixing the ferromagnetic material 20 and the permanent magnets 15 to the rotor, an adhesive is used as in the past.

Therefore, according to this structure, the permanent magnet 3 is attached to the rotor 15.
It is sandwiched between the magnets and is firmly coupled to the nine ferromagnetic material 20, so that it will not be pulled out from the rotor 15.

FIG. 3 shows another embodiment of the invention. This is an acid-formed protrusion 21 m for positioning on the ferromagnetic material 21 . The convex portion 21 & makes it easier to attach the ferromagnetic body 21 and prevents the ferromagnetic body 21 from shifting due to rotation of the rotor 16. In addition, the convex portion 21
m may be formed all along the periphery of the ferromagnetic material 210, or may be formed only at a specific portion. Further, a ninth recess 16g into which the projection 21aft is fitted is formed on the periphery of the hole of the rotor 16.

FIG. 4 shows another embodiment of the present invention, in which a tapered surface 17a is formed in the hole of the rotor 17 to prevent the permanent magnet 3 from protruding or popping out. In this case, the permanent magnet 3 is shaped so as to come into close contact with the tapered surface 17a, and is inserted into the hole from the divided surface side of the divided rotor 1T.

According to this structure, it is possible to more reliably prevent the permanent magnet 3 from flying out.

〔Effect of the invention〕

As explained above, in the present invention, a ferromagnetic material is fixed to the rotor, and a permanent magnet is fixed to the rotor via the ferromagnetic material. The magnets are securely fixed by the rotor.

[Brief explanation of drawings]

1 and 8g2 are structural explanatory diagrams showing a first embodiment of the present invention, FIG. 3 is a sectional view of a rotor showing a second embodiment of the present invention, and FIG. 4 is a diagram showing a third embodiment of the present invention. Cross-sectional view of the rotor showing the embodiment, FIG. 5 i1...Rotating shaft 3...
Permanent magnets 15, 16, 17... Rotor 17a...
・Tapered surface 20.21...Ferromagnetic material 21a...
Convex Patent Applicant Nissan Automatic Co., Ltd. Figure 1 Figure 2 Figure S Figure B

Claims (1)

[Claims] In a permanent magnet field disk type synchronous machine in which a plurality of permanent magnets are arranged in a disk-shaped rotor, a ferromagnetic material is fixed at a predetermined location of the rotor, and the permanent magnet is attached to the rotor through the ferromagnetic material. A permanent magnet field disk type synchronous machine characterized by being fixed to.