JPH06311678A - Rotor structure of permanent magnet-type synchronous motor - Google Patents

Abstract

PURPOSE:To efficiently perform the assembly operation of ring-shaped permanent magnets and to easily automate the assembly operation by a method wherein a ring-shaped spacer is installed between the ring-shaped permanent magnets for a rotor. CONSTITUTION:In a rotor, ring-shaped permanent magnets 11 and ring-shaped spacers 16 are inserted alternately into a shaft 12. The ring-shaped permanent magnets 11 and the ring-shaped spacers 16 are fixed to the shaft 12 by an adhesive 15. The ring-shaped spacers 16 are constituted to be thinner than the thickness of the ring-shaped permanent magnets 11 so as to prevent the adhesive protruding on them from protruding from the outer circumferential face of the ring-shaped permanent magnets 11. When each protrusion 17 is formed at the edge on one side of each ring-shaped permanent magnet 11, the adhesive 15 does not protrude to the surface of the ring-shaped permanent magnets 11 when the permanent magnets are fixed to the shaft 12 by the adhesive, and their assembly operation can be performed efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor structure of a permanent magnet type synchronous motor using a ring-shaped permanent magnet.

[0002]

2. Description of the Related Art FIG. 7 is a diagram showing a rotor structure using a conventional ring-shaped permanent magnet. In FIG. 7, a ring-shaped permanent magnet 1 is arranged on a shaft 2 and is magnetized with multiple poles to form a rotor. The ring-shaped permanent magnet 1 is bonded to the shaft 2 with an adhesive 5. The stator core 3 is arranged on the outer circumference of the rotor with a gap therebetween, and the coils 4 are mounted in a plurality of slots arranged in the inner diameter of the stator core 3. The plurality of ring-shaped permanent magnets 1 are bonded to the shaft 2 with an adhesive 5. At the time of assembly, an adhesive is applied to the outer diameter of the shaft and the inner diameter of the ring-shaped permanent magnet, and the ring-shaped permanent magnet is inserted into the shaft.

[0003]

In the above-described conventional rotor, since the plural ring-shaped permanent magnets 1 are fixed to the shaft 2 by the adhesive 5, the extra adhesive 5 is used for the ring-shaped permanent magnet 1. After protruding from the gap and inserting the ring-shaped permanent magnet into the shaft, it was necessary to wipe off the excess adhesive 5 that had protruded. Further, in the case of a ring-shaped permanent magnet having anisotropy in the magnetic pole direction, it is necessary to align the poles when assembling the ring-shaped permanent magnet, and this alignment is difficult. It was Further, there is a problem that the magnetic flux generated from the axial end of the ring-shaped permanent magnet does not work to generate a rotational force and the magnetic flux is not effectively used.

The present invention has been made to solve the above problems, and a ring-shaped permanent magnet is bonded by an adhesive.
When fixing to the shaft, the adhesive does not stick out between the ring-shaped permanent magnets, and it is easy to assemble the ring-shaped permanent magnet that has anisotropy in the magnetic pole direction. The purpose is to obtain a rotor structure that can effectively utilize the generated magnetic flux.

[0005]

In the rotor structure according to the present invention, a ring-shaped spacer having a thickness smaller than that of the magnet is provided between the ring-shaped permanent magnets. Further, a thin projection is provided on one end surface of the ring-shaped permanent magnet. Further, the ring-shaped permanent magnet is provided with dents on both inner diameter sides, and pins are inserted into the dents.

[0006]

In the present invention, the ring-shaped permanent magnet is fixed to the shaft by the adhesive agent by providing the ring-shaped spacer between the ring-shaped permanent magnets and the projection on one end surface of the ring-shaped permanent magnet. At this time, the adhesive does not stick out to the surface of the permanent magnet, and the assembling work can be performed efficiently.

[0007] Further, when the ring-shaped permanent magnet is fixed to the shaft by an adhesive, the adhesive is permanently attached by providing a dimple on the inner diameter side of both end faces of the ring-shaped permanent magnet and inserting a pin into this dimple. Assembling work can be performed efficiently without protruding to the outer peripheral surface of the magnet, and in the case of a ring-shaped permanent magnet having anisotropy in the magnetic pole direction, the poles can be easily aligned. .

[0008]

Embodiment 1 FIG. 1 is an overall configuration diagram of an embodiment of the present invention. In the rotor of FIG. 1, the ring-shaped permanent magnet 11 is attached to the shaft 12.
And the ring-shaped spacers 16 are alternately inserted. The ring-shaped permanent magnet 11 and the ring-shaped spacer 16 are
It is fixed to the shaft 12 by the adhesive 15. The ring-shaped spacer 16 is configured to be thinner than the thickness of the ring-shaped permanent magnet, and prevents the adhesive that protrudes on the ring-shaped spacer 16 from protruding from the outer peripheral surface of the ring-shaped permanent magnet. FIG. 2 is a detailed view of the rotor portion of FIG.

Next, the operation of the first embodiment will be described with reference to FIGS. In the first embodiment, when the ring-shaped permanent magnet 11 is assembled to the shaft 12 using the adhesive 15, the excess adhesive 15 protrudes from the end surface of the ring-shaped permanent magnet, but collects on the upper portion of the ring-shaped spacer 16.
It does not protrude from the outer peripheral surface of the ring-shaped permanent magnet. For this reason, it is not necessary to wipe off the excess adhesive 15, and the efficiency of the rotor assembling work is improved. On the other hand, since the spacers are inserted between the ring-shaped permanent magnets 11 at both ends of the ring-shaped permanent magnets, leakage of the magnetic flux from the axial end faces of the ring-shaped permanent magnet is reduced, and the magnetic flux can be effectively used.

Second Embodiment FIG. 3 is an overall configuration diagram of a second embodiment of the present invention. Although the ring-shaped spacer 16 is used in the first embodiment,
In the second embodiment, as shown in FIG. 3, the ring-shaped permanent magnet 11 is used.
The protrusion 17 is provided on the end surface on one side, and the same effect as that of the first embodiment can be obtained without the ring spacer. Here, the protrusion 17 is configured to be thinner than the magnet thickness, and prevents the adhesive that protrudes thereon from protruding from the outer peripheral surface of the ring-shaped permanent magnet. In the present embodiment, since the ring-shaped spacer is unnecessary, the number of parts is reduced, and further more than in the first embodiment.
The efficiency of rotor assembly work is improved. Figure 4 (a)
FIG. 4 is an end view of the ring-shaped permanent magnet 11 with protrusions as viewed from the line AA of FIG. 3, and FIG. 4B is a partial cross-sectional view taken along the line BB of FIG. 4A.

Third Embodiment FIG. 5 is an overall configuration diagram of a third embodiment of the present invention. Although the ring-shaped spacer 16 is used in the first embodiment, in the third embodiment, as shown in FIG. By inserting the pin 19, the same effect as that of the first embodiment can be obtained without the ring-shaped spacer 16. Generally, in the case of a ring-shaped permanent magnet having anisotropy in the magnetic pole direction, it is necessary to match the magnetic pole direction when the ring-shaped permanent magnet is assembled. The magnetic poles can be easily positioned, and the efficiency of the rotor assembling work is improved. Figure 6
FIG. 5A is an end view of the ring-shaped permanent magnet 11 with dimples as seen from the line CC in FIG. is there.
FIG. 6A is a partial cross-sectional view taken along the line DD of FIG. 6A.

[0012]

As described above, according to the present invention, when the ring-shaped magnet is incorporated into the shaft, the excess adhesive does not stick out to the outer peripheral surface of the magnet, so that the extra work of wiping the adhesive is unnecessary, Work efficiency improves. Also, by providing a dimple on the inner diameter side of the ring-shaped magnet, the poles of the ring-shaped permanent magnet having anisotropy in the magnetic pole direction can be easily positioned, and automation of assembly work of the ring-shaped permanent magnet is facilitated. .

Further, since the magnetic flux of the permanent magnet is also generated from the end surface of the permanent magnet, by providing a space having an optimum width (1 to 1.5 times the motor gap) between the ring-shaped permanent magnets, The magnetic flux generated from the end face of the permanent magnet can be effectively utilized, and the characteristics which are substantially the same as those of the case where all of the magnets are used instead of the space are obtained, and the magnet material is saved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the rotor according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a rotor according to a second embodiment of the present invention.

FIG. 4 is an end view of a ring-shaped permanent magnet with protrusions according to a second embodiment.

FIG. 5 is a sectional view of a rotor according to a third embodiment of the present invention.

FIG. 6 is an end view of a ring-shaped permanent magnet with dimples according to a third embodiment.

FIG. 7 is a cross-sectional view showing a conventional rotor structure.

[Explanation of symbols]

 1 Ring Magnet 2 Shaft 3 Stator Core 4 Coil 5 Adhesive 11 Ring Magnet 12 Shaft 13 Stator Core 15 Adhesive 16 Ring Spacer 17 Protrusion 18 Kubomi 19 Pin 20 Magnetic Flux

Claims (3)

[Claims] 1. A rotor having a plurality of ring-shaped permanent magnets magnetized in multiple poles, a stator core having a main magnetic pole forming a closed magnetic path of magnetic flux, and a main magnetic pole of the stator core. A permanent magnet type synchronous motor having a plurality of coils according to claim 1, wherein a ring-shaped spacer is provided between the ring-shaped permanent magnets of the rotor. 2. A rotor structure for a permanent magnet type synchronous motor, characterized in that, in the ring-shaped permanent magnet of the rotor, one end surface of a magnetic pole is formed in a protruding shape. 3. A rotor structure for a permanent magnet type synchronous motor, characterized in that, in the ring-shaped permanent magnet of the rotor, both side surfaces of magnetic poles are provided with dents and pins are inserted into the dents.