JPH09140077A - Rotor in rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor in a rotating machine wherein its stable magnetic flux density can be obtained making the stable bonding of its magnet to its shaft possible to keep the air gap between its magnet and stator constant uniformly. SOLUTION: A rotor 2 of a rotating machine comprises a shaft 5, a magnet 6 to be fixed on the shaft 5 and a pipe 7 to be fixed in an engagement way on the outer periphery of the magnet 6. In a large-diameter portion 50 of the shaft 5, groove portions 53 with wide widths are formed leaving flange portions 51 therein as they are. Further, a bonding agent 8 is applied to the groove portions 53 for the magnet 6 to be disposed and fixed on the large-diameter portion 50. Also, the pipe 7 is fixed in an engagement way on the magnet 6 along its outer periphery. Therefore, the magnet 6 is disposed on the shaft 5 concentrically with it to keep the air gap between the magnet 6 and the stator of the rotating machine constant uniformly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor in a rotating machine used in an electric motor or the like, and more particularly to bonding a shaft constituting the rotor and a magnet.

[0002]

2. Description of the Related Art Conventionally, rotors used in electric motors, etc.
As shown in FIG. 7, it is configured by including a rotatable shaft and a magnet fixed to the shaft. By applying an adhesive to the outer circumference of the shaft and sliding the magnets together, a gap is formed between the shaft and the magnet. It was fixed so that it could not be done.

[0003]

However, in the conventional method of adhering the shaft and the magnet, if the amount of the adhesive applied to the shaft varies, or if a part of the force is applied during the sliding operation, it is possible to cause a problem as shown in FIG. As described above, the film thickness of the adhesive changes and the outer circumference of the magnet cannot be aligned at a position concentric with the shaft, and the air gap between the magnet and the stator is not aligned. Since the magnetic flux emitted from the magnet has a property of passing the shortest distance, if the air gap is wide, the magnetic flux will flow to the shaft or the magnet without flowing to the stator. Therefore, a stable magnetic flux density cannot be obtained, the magnetic flux does not act effectively, and cogging torque and torque ripple characteristics are not stable. Further, since the stable adhesion cannot be maintained, the magnet comes off.

The present invention solves the above-mentioned problems, and enables stable adhesion between the shaft and the magnet, so that the air gap between the magnet and the stator can be made uniform and a stable magnetic flux density can be obtained. An object is to provide a rotor in a rotating machine.

[0005]

A rotor in a rotating machine according to the present invention is a rotor in a rotating machine including a shaft and a magnet fixed to the shaft with an adhesive, the magnet being fixed to the rotor. A groove for applying an adhesive is formed in a part of an outer peripheral portion of the shaft.

Further preferably, the groove may be formed in the circumferential direction of the shaft.

A rotor in this rotating machine is a rotor in a rotating machine including a shaft and a magnet fixed to the shaft with an adhesive, and one of outer peripheral portions of the shaft to which the magnet is fixed. A groove for applying an adhesive is formed in the portion, and at least 2 is formed in the groove.
It is characterized in that an elastic tape is wound around the place.

Further, it is preferable that the pipe is arranged so as to be fitted on the outer circumference of the magnet.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial sectional view of a motor. A rotor 2 is rotatably supported in a motor body 1 via bearings, and a stator 3 is attached to the outer periphery of the rotor 2. A gap called an air gap 4 is formed between the rotor 2 and the stator 3.

As shown in FIG. 2, the rotor 2 has a stepped shaft 5 having bearings at both ends thereof, a magnet 6 fixed to the shaft 5, and a magnet 6 fitted around the magnet 6. It is provided with a pipe 7.

The large-diameter portion 50 of the shaft 5 is provided with two groove portions 53 having a wide width and a slight depth except for the jaw portions 51 formed at the central portion and both side portions. The adhesive 8 is applied to the groove portion 53. The magnet 6 is shown in FIG.
As shown in FIG. 3, the jaw portion 5 of the large diameter portion 50 is divided into four grooves for one groove 53 and is adhered to the adhesive 8.
1 is supported and fixed. Then, a thin pipe 7 is provided on the outer periphery of the magnet 6 so as to regulate the magnet 6.
Is fitted.

Further, a multi-pole stator 3 is arranged on the outer periphery of the pipe 7, and the above-mentioned air gap 4 is formed between the stator 3 and the magnet 6.

In this embodiment, the magnet 6 is supported by the jaw 51 and fixed by the adhesive applied in the groove 53 formed in a wide width, so that the outer periphery of the magnet 6 is substantially concentric with the shaft 5. The air gap 4 can be formed to have the same width over the entire circumference. Further, since the magnet 6 is sufficiently adhered and regulated by the pipe 7, the magnet 6 does not peel off and pop out.

When an electric current flows through the coil passing through the stator, a field is generated between the stator 3 and the magnet 7 to rotate the rotor 2.

The groove portion formed in the large-diameter portion 50 of the shaft 5 may be a plurality of groove portions 55 formed in the axial direction of the shaft 5, as shown in FIG. in this case,
The width of the groove 55 is preferably formed larger than that of the jaw 54 in order to enhance the adhesive effect of the adhesive 8 applied to the groove 55. Then, after the adhesive is applied, the magnet 6 is supported and fixed by the jaw portion 54.

Further, the large diameter portion 50 of the shaft 5 may be provided with a plurality of slots. Also in this case, in order to improve the adhesive effect, it is preferable to make the shape of the slot as large as possible.

The rotor 22 shown in FIGS. 5 and 6 shows another embodiment of the present invention, in which the large diameter portion 50 of the shaft 5 of the rotor 22 has a jaw portion formed in the central portion and both side portions. With the exception of 51, two wide and slightly deep groove portions 53 are formed. Resilient tapes 25 are wound on both sides of each groove 53.
The adhesive 8 is applied between 5 and 25. Tape 25
The tape may be a generally well-known tape as long as it is elastic.

The magnet 6 is adhered to the adhesive 8 so as to compress the tape 25 on the outer periphery of the tape 25.
When the pipe 7 is fitted onto the outer circumference of the magnet 6, the magnet 6 is positioned and regulated by the inner circumference of the pipe 7. Therefore, the magnets 6 are aligned with the inner circumference of the pipe 7, and a slight gap is formed between the magnet 6 and the jaw portion 51 of the shaft 5.

In the rotor 22 of this embodiment,
Since the outer circumferences of the magnets 6 are aligned, the air gap with the stator is also uniformly aligned over the entire circumference, and a stable magnetic flux density is obtained.

[0021]

According to the rotor of the present invention, a groove is formed in a part of the outer peripheral portion of a shaft which constitutes the rotor, and an adhesive is applied to the groove. And since the magnet is fixed by adhesion to the outer periphery of the shaft to which the adhesive is applied,
The magnet can be aligned concentrically with the shaft. Therefore, the air gap formed between the magnet and the stator is uniformly aligned, a stable magnetic flux density is obtained, the cogging torque and torque ripple characteristics are stabilized, and the magnet does not peel off from the shaft.

Further, according to the rotor of the second embodiment of the present invention, a groove is formed in a part of the outer peripheral portion of the shaft forming the rotor, and an adhesive is applied to the groove. Then, a tape having elasticity is wound around at least two places of the groove, and a magnet is fixed so as to compress the tape.
Furthermore, since the pipe is fitted so as to regulate the outer circumference of the magnet, the air gap formed between the magnet and the stator is uniform over the entire circumference, a stable magnetic flux density is obtained, and cogging torque and torque ripple characteristics are improved. It is stable and the magnet does not come off the shaft.

[Brief description of the drawings]

FIG. 1 is a sectional view of a motor using a rotor according to an embodiment of the present invention.

FIG. 2 is a front sectional view of a rotor according to an embodiment of the present invention.

FIG. 3 is a side sectional view of FIG.

FIG. 4 is a perspective view showing another embodiment of the shaft.

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

6 is a side sectional view of FIG.

FIG. 7 is a perspective view showing a conventional rotor.

FIG. 8 is a side sectional view showing a conventional rotor.

[Explanation of symbols]

 2, 22 ... Rotor 3 ... Stator 4 ... Air gap 5 ... Shaft 6 ... Magnet 7 ... Pipe 8 ... Adhesive 25 ... Tape 51 ... Jaw 53 ... Groove

Claims (5)

[Claims] 1. A rotor in a rotating machine comprising a shaft and a magnet fixed to the shaft with an adhesive, wherein the adhesive is applied to a part of an outer peripheral portion of the shaft to which the magnet is fixed. A rotor in a rotating machine, wherein a groove is formed. 2. The rotor according to claim 1, wherein the groove is formed in a circumferential direction of the shaft. 3. A rotor in a rotating machine comprising a shaft and a magnet fixed to the shaft with an adhesive, wherein the adhesive is applied to a part of an outer peripheral portion of the shaft to which the magnet is fixed. A rotor for a rotating machine, wherein a groove having a groove is formed, and a tape having elasticity is wound in at least two places in the groove. 4. The rotor according to claim 3, wherein the groove is formed in a circumferential direction of the shaft. 5. The rotor for a rotating machine according to claim 3, wherein a pipe is arranged so as to be fitted on the outer circumference of the magnet.