JPH0441720A - Overhung type spindle - Google Patents

Abstract

PURPOSE:To facilitate regulation of imbalance by alternately providing the rotating shaft of a spindle with plural magnets and at least one nonmagnetic member in a place located on the inside of an iron core in the shaft direction. CONSTITUTION:The rotating shaft 3 of a spindle is provided with plural magnets 7 and at least one nonmagnetic ring 8 alternately arranged in a place located on the inside of an iron core 2 and the nonmagnetic ring is suitably ground to correct dynamic balance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a no-overhung spindle with an integrated electric motor used in textile machinery.

More specifically, the present invention relates to an integrated electric motor consisting of a machine frame, an iron core fixed to the inside of the machine frame, and a rotating shaft rotatably supported by the machine frame and extending from the inside of the iron core to the outside of the machine frame. Regarding overhung type spindles.

[Conventional technology]

In textile machinery, an overcoat with an integrated electric motor consists of a machine frame, an iron core fixed to the inside of the machine frame, and a rotating shaft rotatably supported by the machine frame and extending from the inside of the iron core to the outside of the machine frame. A hanging spindle is used.

In such an overhung spindle, if the center of gravity is offset from the rotation axis, the centrifugal force due to the eccentricity causes the spindle to whirl around when the spindle rotates, and in particular, the overhung spindle tip swings. The unbalanced force due to the whirling described above is transmitted from the bearing to the machine frame, causing vibration and noise.

If you try to cut the magnet itself to correct the balance of such an overhung spindle, the strength of the magnet may become small and it may crack. Therefore, in the past, the balance was corrected by cutting not the magnet but the circumferential surface of the rotor shaft to which the magnet is attached, that is, the circumferential surface of the rotor shaft located on the outside when viewed in the rotor axis direction near both ends of the magnet. Alternatively, balance could be improved by increasing the machining precision of the entire rotor, including the magnets, to reduce the amount of unbalance (in other words, by increasing the precision of balancing).

[Problem to be solved by the invention]

In recent years, as textile machines have become longer and faster, overhung spindle devices have become smaller, longer, and faster. Along with this, the magnet portion of the rotor has become smaller in diameter and longer (for example, when the rotor outer diameter is D and the rotor length is L, 3D≦L≦10D).

The conventional way of adjusting the balance of an elongated rotor by cutting only the circumferential surface of the rotor shaft on the outside of both ends of the magnet makes it difficult to adjust the imbalance that exists in the longitudinal center of the magnet. I can't. For this reason, when the rotor rotates at high speed, the shaft is deformed due to unbalance, causing vibration, and the portion of the rotating shaft that extends outside the machine frame swings around considerably. Through this reversal,
The cylindrical body or disk-shaped body fixed or attached to the shaft will be scattered. Additionally, there is a problem in that the rotating shaft may break due to fatigue of the rotating shaft due to vibration.

[Purpose of the invention]

In view of the above-mentioned problems, the present invention integrally incorporates an electric motor,
In overhung spindles, where the protruding part of the rotating shaft tends to swing back due to vibrations caused by unbalanced rotating shaft,
The object of the present invention is to provide a device that allows for easy adjustment of unbalance and is free from the above-mentioned problem of breakage.

[Means to solve the problem]

The present invention achieves the above object by providing a machine frame, an iron core fixed to the inside of the machine frame, and a machine frame rotatably supported by the machine frame and extending from the inside of the iron core to the outside of the machine frame. In an overhung spindle integrated with a motor and consisting of a rotating shaft, a plurality of magnets and at least one member made of a non-magnetic material are arranged alternately in the axial direction in a portion located inside an iron core of the rotating shaft. This is achieved by an overhung spindle, characterized in that the non-magnetic member is provided with a dynamic balance correction surface.

[For production]

In the present invention, a plurality of magnets and at least one member made of a non-magnetic material are arranged alternately in the axial direction in a portion located inside the iron core of the rotating shaft of the overhang type spindle. Since the body member is equipped with a dynamic balance correction surface, it is possible to shave off the non-magnetic member located in the axially intermediate part of the rotor magnet, and only the peripheral surface of the rotor on the outside of both ends of the conventional magnet can be removed. The accuracy of balance adjustment is increased compared to the case where the

In addition, since the diameter of the non-magnetic member is larger than the diameter of the rotating shaft and has a greater influence on dynamic balance, unbalance can be adjusted more easily by cutting the non-magnetic member.

Note that magnets may be located at both ends of the rotor in the axial direction, but if a non-magnetic material is located at one or both ends, the axial end surface of this non-magnetic material also serves as a dynamic balance correction surface. It can be used as

〔Example〕

The following will explain based on examples.

[Embodiment 1] FIG. 1 is a longitudinal sectional view of an embodiment in which the present invention is applied to a spindle for mounting a yarn package.

In FIG. 1, 1 is a machine frame that is fixedly installed, and 2 is a laminated iron core made of, for example, a silicon steel plate, which is fixed to the machine frame 1 by press fitting or the like.

The rotating shaft 3 is supported by the machine frame 1 by a pair of upper and lower bearings 6, and extends outward beyond the upper end of the machine frame 1.

A yarn package fixing member 5 is fixedly attached to the extending portion 3a of the rotating shaft 3, and a pin 4a is implanted in the package fixing member 5.

The engagement hole of the winding core 4 inserted into the rotating shaft 3 is engaged with the pin 4a, and the winding core 4 is supported on the rotating shaft 3.

A rotor 9 is attached to the rotating shaft 3 so as to face the laminated iron core 2, and the rotor 9 has a radial gap between the rotor 9 and the iron core 2 of 0.5 mm to 1 mm.

The rotor 9 is composed of a plurality of disk-shaped magnets 7 and one or more non-magnetic rings 8. When viewed in the axial direction of the rotating shaft 3, the non-magnetic rings 8 are located between the magnets 7. It's being pinched.

In this embodiment, the upper and lower end surfaces of the rotor 9 are also made of non-magnetic rings 8, but the upper and lower end surfaces may also be made of magnets 7 as in the embodiment shown in FIG.

The dynamic balance is corrected by cutting the circumferential surface of the rotating shaft 3 near the upper and lower end surfaces of the rotor 9 (X section in FIG. 1) and the outer circumferential surface of the non-magnetic ring 8.

[Example 2] Fig. 2 is a longitudinal sectional view of an example in which the present invention is applied to a so-called three-axis multi-plate friction false twisting device for twisting yarn, and only one of the three axes is used. It shows.

In FIG. 2, 11 is a fixedly installed machine frame, and 12 is a laminated iron core made of, for example, a silicon steel plate, which is fixed to the machine frame 11 by press-fitting or the like. The rotating shaft 13 is rotatably supported by the machine frame 11 by a bearing 16 and extends outward beyond the upper end surface of the machine frame 11, and a bolt 14 is screwed into the extending portion of the rotating shaft 13 from above. A circular disk 15 is fixed thereto.

A rotor 19 is attached to the rotating shaft 13 so as to face the iron core 12 and set to have a radial clearance of 0.5 g+1 to 1.0 mm.

The rotor 19 includes a disc-shaped magnet 17, a non-magnetic ring 18, a disc-shaped magnet 17...a disc-shaped magnet 17, a non-magnetic ring 18, and a disc-shaped magnet 17, that is, a plurality of disc-shaped magnets. disc-shaped magnet 17
and one or more non-magnetic rings 18, and the non-magnetic rings 18 are sandwiched between the magnets 17 when viewed in the axial direction of the rotating shaft 13.

In this embodiment as well, the dynamic balance is corrected by cutting the circumferential surface of the rotating shaft near the end face of the rotor 19 (X section in FIG. 2) and the outer circumferential surface of the non-magnetic ring 18.

In both of the above embodiments, the balance correcting member (ring 8.18 made of non-magnetic material) was manufactured separately from the rotating shaft 3.13 and fixed to the rotating shaft 3.13, but the balance correcting member 8.18
may be formed integrally with the axis of rotation 3.13.

〔Effect of the invention〕

In the present invention, a plurality of magnets and at least one member made of a non-magnetic material are arranged alternately in the axial direction in a portion located inside the iron core of the rotating shaft of the overhang type spindle. Since the body member is equipped with a dynamic balance correction surface, the member made of non-magnetic material located in the axially intermediate part of the rotor magnet can be shaved, and only the outer peripheral surface of the rogue on the outside of both ends of the conventional magnet can be removed. The adjustment accuracy will be higher than if the parts were cut.

In addition, the diameter of the non-magnetic member is larger than the diameter of the rotating shaft, which has a large effect on dynamic balance. Therefore, in the present invention, the unbalance can be adjusted more easily by cutting the non-magnetic member.

That is, according to the present invention, by attaching a non-magnetic ring to the rotor, providing a dynamic balance correction surface, and performing balance correction, it is possible to reduce the amount of unbalance of the rotation axis, and to reduce the amount of unbalance of the rotation axis near one end surface of the conventional rotor. Compared to balance correction that only cuts the surface, the whirling of the rotating shaft can be kept to a small level.

This suppresses the scattering of the yarn package or disc-shaped disk attached to the tip of the rotating shaft, and also prevents the shaft from breaking.

FIG. 3 shows the vibration values when rotating the yarn package rotation device (magnet length is about 4 times the magnet outer diameter) as shown in Example 1, for the conventional device (dashed line) and the device of the present invention (dashed line). (solid line), the horizontal axis shows the rotation speed of the rotating shaft, and the vertical axis shows the runout of the shaft tip.

The conventional device has a resonance point (in the example, approximately 0.6×10'
rps) The vibration level when passing is large. Furthermore, as the rotational speed increases beyond 1.8xlO'rp, the vibration level in the conventional device increases (as shown by the upward curve to the right in FIG. 3) and becomes extremely large. on the other hand,
According to the device of the present invention, the resonance point (approximately 0.6 x 10'
rps) and high-speed rotation to a relatively low level (
It can be suppressed.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional views of different embodiments of the present invention, and FIG. 3 is a diagram comparing the vibration levels of the inventive device and the conventional device. 1.11...Machine frame, 2.12...Iron core, 3.1
3...Rotating axis, 7.17-1. magnet, 8.1
8...Non-magnetic ring, 9.19-...Rotor

Claims (1)

[Claims] 1. An integrated electric motor consisting of a machine frame, an iron core fixed to the inside of the machine frame, and a rotating shaft rotatably supported by the machine frame and extending from the inside of the iron core to the outside of the machine frame. In the overhung spindle, a plurality of magnets and at least one non-magnetic member are arranged alternately in the axial direction in a portion located inside the iron core of the rotating shaft, and the non-magnetic member is An overhung spindle characterized by a dynamic balance correction surface.