Rotor of hollow shaft motor

Abstract

A rotor of a hollow shaft motor according to the present invention is characterized by comprising: a plurality of magnets (20) arranged at equal intervals on the outer circumferential surface of a hollow shaft housing (11); a support member (30) for magnet regular position arrangement, which is inserted into a separation space (S) between the magnets (20) and supports the lower part of each of the magnets (20); and a rotor can (40) coupled to the support member (30) for magnet regular position arrangement to surround and protect the outer circumferential surfaces of the plurality of magnets (20), wherein a fitting protrusion (33) protruding from the inside of a ring-shaped support part (31) of the support member (30) for magnet regular position arrangement is elastically fitted into a fitting groove (11A) formed in the hollow shaft housing (11) in a fitting manner to maintain the coupling of the support member (30) for magnet regular position arrangement to the hollow shaft housing (11) with a strong binding force.

Description

Rotor of hollow shaft motor

[0001] The present invention relates to a rotor of a hollow shaft motor. Specifically, the present invention relates to a rotor of a hollow shaft motor used in an integrated brake system that uses a support member for magnet positioning on the outer circumferential surface of a hollow shaft housing of the hollow shaft motor to arrange a plurality of magnets at equal intervals to block contact between the magnets and at the same time prevent the magnets from coming off or rotating during the rotation of the hollow shaft, thereby improving the efficiency of the rotor.

[0002] In general, a motor consists of a rotor and a stator, and depending on the structure in which the magnet is installed on the outer peripheral surface of the rotor, the rotor is classified into an IPM (Internal Permanent Magnet) type rotor in which the magnet is inserted and bonded inside the rotor core, and an SPM (Surface Permanent Magnet) type rotor in which the magnet is attached to the surface of the rotor core.

[0003] In the case of the SPM type motor, as presented in Korean Patent No. 10-0812784, when the structure is such that the magnet is bonded to the rotor core to prevent the magnet from coming off, there is a concern that the bonding force may be weakened by environmental influences or the magnetizing force of the magnet may be reduced, causing the magnet to come off from its place due to the rotational force of the rotor when the rotor rotates. To resolve this, a plurality of magnet housings are press-fitted into installation grooves formed at equal intervals on the outer peripheral surface of the rotor, thereby preventing the magnet from coming off.

[0004] However, since additional costs are incurred for machining the rotor core for inserting the magnets, and since rotational force and dimensional accuracy between the rotational shaft and the core are required, not only does the manufacturing cost of the motor increase, but there is also a problem of reduced assembly productivity of the motor. In addition, even if the magnets are press-fitted and joined to each magnet housing, when the motor is used for a long period of time, the press-fit force of the magnet housing weakens, causing one or more of the heavy magnets to sag or flow down toward the bottom of the rotor, preventing the magnets from being aligned evenly, so that the opposing arrangement with the coils that make up the stator cannot be continuously maintained, and there is a problem of reduced rotor function due to weakened magnetic field strength.

[0005] In order to solve the above problems, as in Korean Patent No. 10-1728543, a mold is formed using an insert injection method using a mold on the outside of the core to prevent magnet detachment. However, in this case, the quality of the product deteriorates due to deformation of the mold, product defects occur, and there is a disadvantage in that the management cost for rotor production increases.

[0006] Accordingly, the present invention proposes a new hollow shaft motor rotor having a simple configuration that shortens the assembly process of rotation and prevents the magnet from detaching and rotating.

[0007] The purpose of the present invention is to provide a rotor of a hollow shaft motor capable of preventing motor drive control failure by blocking contact between magnets by accurately and stably aligning the magnets in the correct position.

[0008] Another object of the present invention is to provide a rotor of a hollow shaft motor in which a magnet positioning support member combined with a rotor can is easily connected to a hollow shaft housing with a strong bonding force to shorten the assembly process of the rotor, and at the same time, when the hollow shaft rotates, the hollow shaft, the magnet positioning support member, and the rotor can rotate integrally without idle rotation, thereby increasing the rotational force, and a rotor can that surrounds the outer peripheral surfaces of a plurality of magnets is connected to the magnet positioning support member with a simple configuration to prevent the magnets from rotating and coming off when the rotor rotates.

[0009] The above-mentioned object and other inherent objects of the present invention can all be easily achieved by the present invention described below.

[0010] The rotor of the hollow shaft motor according to the present invention is:

[0011] A plurality of magnets (20) arranged at equal intervals on the outer circumference of the hollow shaft housing (11);

[0012] A support member (30) for positioning the magnets (20) and supporting each lower part of the magnets (20) while being inserted into the gap space (S) between the magnets (20); and

[0013] A rotor can (40) that is combined with a support member (30) for magnet positioning and wraps and protects the outer peripheral surface of a plurality of magnets (20);

[0014] Including,

[0015] The magnet positioning support member (30) is characterized in that the protruding fitting projection (33) on the inside of the ring-shaped support portion (31) is elastically fitted into the fitting groove (11A) formed in the hollow shaft housing (11) in a fitted manner so that the magnet positioning support member (30) is firmly fixed to the hollow shaft housing (11).

[0016] In the present invention, the support member (30) for positioning the magnet is an injection-molded product made of a synthetic resin material having elasticity, and includes a ring-shaped support member (31) that supports the magnet (20);

[0017] A vertical support (32) for maintaining the magnet spacing, which is fitted into a plurality of magnet spacing spaces (S) that protrude upward at equal intervals from the ring-shaped support (31);

[0018] It may be configured to include a protrusion (33) protruding from the inner surface of the ring-shaped support (31).

[0019] In the present invention, a plurality of fitting grooves (34) may be formed at equal intervals on the outer circumferential surface of the ring-shaped support portion (31).

[0020] In the present invention, one or more fitting projections (33) protruding from the inner surface of the ring-shaped support portion (31) of the magnet positioning support member (30) may be fitted into one or more circular fitting grooves (11A) formed in the hollow shaft housing (11) below the magnet, so that the magnet positioning support member (30) is maintained in combination with the hollow shaft (10).

[0021] In the present invention, it is preferable that a plurality of fitting protrusions (41) protruding at equal intervals inwardly from the lower circumference of the rotor can (40) are pressed into a plurality of fitting grooves (34) formed at equal intervals on the outer circumferential surface of the ring-shaped support portion (31) of the magnet positioning support member (30) so that the magnet positioning support member (30) and the rotor can (40) are maintained in combination and wrap around and protect the circumferential surface of the magnet (20).

[0022] The rotor of the hollow shaft motor according to the present invention is:

[0023] A plurality of magnets (20) arranged at equal intervals on the outer circumference of the hollow shaft housing (11);

[0024] A support member (30) for positioning the magnets (20) and supporting each lower part of the magnets (20) while being inserted into the gap space (S) between the magnets (20); and

[0025] A rotor can (40) that is combined with a support member (30) for magnet positioning and wraps and protects the outer peripheral surface of a plurality of magnets (20);

[0026] It is characterized in that the support member (30) for positioning the magnet is guided upwardly along the fitting guide groove (11B) formed in the hollow shaft housing (11) by including a protrusion (33) protruding from the inside of the ring-shaped support portion (31) so that the fitting protrusion (33) is caught on the upper end of the fitting guide groove (11B) and is elastically pressed in so that the support member (30) for positioning the magnet is firmly fixed to the hollow shaft housing (11).

[0027] In the present invention, the support member (30) for positioning the magnet is an injection-molded product made of a synthetic resin material having elasticity, and includes a ring-shaped support member (31) that supports the magnet (20);

[0028] A vertical support (32) for maintaining the magnet spacing, which is fitted into a plurality of magnet spacing spaces (S) that protrude upward at equal intervals from the ring-shaped support (31);

[0029] It may be configured to include a protrusion (33) protruding from the inner surface of the ring-shaped support (31).

[0030] In the present invention, a plurality of fitting grooves (34) may be formed at equal intervals on the outer circumferential surface of the ring-shaped support portion (31).

[0031] In the present invention, one or more fitting projections (33) protruding from the inner surface of the ring-shaped support portion (31) of the magnet positioning support member (30) may be guided and fitted into one or more circular fitting guide grooves (11B) formed in the hollow shaft housing (11) below the magnet (20), so that the magnet positioning support member (30) may be maintained in combination with the hollow shaft (10).

[0032] In the present invention, it is preferable that a plurality of fitting protrusions (41) protruding at equal intervals inwardly from the lower circumference of the rotor can (40) are pressed into a plurality of fitting grooves (34) formed at equal intervals on the outer circumferential surface of the ring-shaped support portion (31) of the magnet positioning support member (30) so that the magnet positioning support member (30) and the rotor can (40) are maintained in combination, thereby wrapping and protecting the circumferential surface of the magnet (20).

[0033] The present invention provides a magnet positioning support member coupled to a rotor can that is firmly and fit-fitfully connected to a hollow shaft to support a plurality of magnets arranged on the outer circumference of the hollow shaft, thereby preventing the bonded magnets from sagging or flowing down due to weakened bonding force or weakened magnetization force caused by environmental influences, thereby ensuring that the magnets are accurately and stably aligned and installed in their proper positions, thereby preventing weakening of the magnetic field strength by continuously maintaining the opposite arrangement with the coils that constitute the stator assembly, thereby preventing loss of function of the rotor, thereby improving the quality of the rotor and enhancing the reliability of the rotor.

[0034] In addition, the present invention has the effect of reducing the deterioration of the quality or defect rate of the rotor by effectively preventing the magnet and the magnet positioning support member from coming off when the hollow shaft rotates by wrapping and protecting the outer peripheral surface of the magnet with a rotor can that is simply combined with a magnet positioning support member.

[0035] In addition, the present invention maintains a constant gap between magnets by means of a vertical protrusion for maintaining the gap of a support member for magnet positioning, thereby preventing motor drive control failure and motor damage that may occur due to contact between magnets, thereby extending the life of the rotor and improving its quality.

[0036] In addition, the present invention has the effect of reducing manufacturing costs by improving assembly productivity by shortening the rotor assembly process by easily fitting a support member for magnet positioning to a hollow shaft housing without welding or separate adhesive.

[0037] In addition, the present invention has the effect of preventing the support member for magnet positioning from shaking or coming off when the hollow shaft rotates by firmly bonding the support member for magnet positioning to the hollow shaft, and also preventing the magnet from rotating when the hollow shaft rotates.

[0038] FIG. 1 is a perspective view of a first embodiment of a rotor of a hollow shaft motor according to the present invention.

[0039] Figure 2 is an exploded perspective view of a first embodiment of a rotor of a hollow shaft motor according to the present invention.

[0040] FIG. 3 is a perspective view of a partial assembly of a rotor of a hollow shaft motor according to a first embodiment of the present invention.

[0041] Figure 4 is a cross-sectional view taken along line AA of Figure 1.

[0042] Figure 5 is a cross-sectional view taken along line BB of Figure 1.

[0043] Fig. 6 is a perspective view of a second embodiment of a rotor of a hollow shaft motor according to the present invention.

[0044] Fig. 7 is an exploded perspective view of a second embodiment of a rotor of a hollow shaft motor according to the present invention.

[0045] Fig. 8 is a partially excerpted perspective view of a second embodiment of a rotor of a hollow shaft motor according to the present invention.

[0046] Figure 9 is a cross-sectional view taken along line CC of Figure 6.

[0047] Figure 10 is a cross-sectional view taken along line DD of Figure 6.

[0048] Fig. 11 is a cross-sectional view taken along line EE of Fig. 6.

[0049] The present invention will be described in detail below with reference to the attached drawings.

[0050] FIG. 1 is a perspective view of a first embodiment of a rotor (100) of a hollow shaft motor according to the present invention, FIG. 2 is a disassembled perspective view of a first embodiment of a rotor (100) of a hollow shaft motor according to the present invention, FIG. 3 is a perspective view of a part of a first embodiment of a rotor (100) of a hollow shaft motor according to the present invention, FIG. 4 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 5 is a cross-sectional view taken along line BB of FIG. 1.

[0051] In general, a hollow shaft motor includes a rotor (100) referred to as a rotor assembly including a screw shaft, a motor housing, a stator assembly coupled to the inside of the motor housing, and a hollow shaft (10) positioned on the inside of the stator assembly, and the screw shaft has a lower portion coupled to the hollow shaft (10) so as to rotate together with the rotor (100). A ball nut is coupled to the outer circumference of the screw shaft, and the ball nut moves upward or downward according to the rotation of the screw shaft to generate or remove pressure on the piston.

[0052] As illustrated in FIGS. 1 to 5, a rotor (100) of a hollow shaft motor according to the present invention comprises: a hollow shaft (10) into which a screw shaft (not illustrated) is fitted and which has a space therein; a plurality of magnets (20) arranged at equal intervals on the outer circumferential surface of a hollow shaft housing (11); a support member (30) for positioning magnets formed of an injection-molded synthetic resin material having elasticity and which is fitted into a space (S) between the magnets (20) and which supports the lower circumferential surface of the magnets (20) as a stopper; and a rotor can (40) which is combined with the support member (30) for positioning magnets and wraps and protects the outer circumferential surface of the magnets (20). It is preferable that the rotor can (40) be formed of a stainless steel material.

[0053] The above hollow shaft (10) is known in various forms as a structure in which upper and lower bearings are installed on the upper and lower parts of the hollow shaft housing (11) and a screw shaft (not shown) is inserted and installed.

[0054] The rotor (100) of the hollow shaft motor according to the present invention is arranged by bonding a plurality of magnets (20) at equal intervals on the outer circumferential surface of the hollow shaft housing (11) of the hollow shaft (10) with an adhesive, and then a plurality of vertical supports (32) for maintaining the gap between magnets of the support member (30) for positioning the magnets are fitted into the gap space (S) between the magnets (20) so that the magnets (20) are accurately and stably aligned and installed at the correct position at a certain interval, thereby preventing motor drive control failure and motor damage that may occur due to contact between the magnets (20) and the magnets (20).

[0055] In addition, by supporting the lower portion of each magnet (20) by the ring-shaped support portion (31) of the support member (30) for magnet positioning, the bonded magnet (20) is prevented from having a tendency to sag or flow downward due to weakened bonding force or weakened magnetization force caused by environmental influences, thereby preventing the magnet (20) from being detached from the weight body, so that the magnet (20) can be accurately and stably aligned in the position, and the opposite arrangement with the coils constituting the stator assembly can be continuously maintained, thereby preventing weakening of the magnetic field strength and preventing loss of function of the rotor (100).

[0056] The support member (30) for positioning the magnet is formed in a state in which a plurality of magnet spacing maintaining vertical supports (32) are inserted into a plurality of magnet spacing spaces (S) at equal intervals above the upper edge surface of the ring-shaped support member (31) that supports the magnet (20) and protrude upward, and one or more insertion projections (33) protruding on the inner surface of the ring-shaped support member (31) are elastically inserted into one or more circular insertion grooves (11A) formed in the hollow shaft housing (11) below the magnet (20) so that the support member (30) for positioning the magnet is maintained in combination with the hollow shaft housing (11) with a strong bonding force, and the vertical supports (32) for positioning the magnet are inserted between the vertical supports (32) for positioning the magnet and the vertical supports (32) for positioning the magnet on the upper edge surface of the ring-shaped support member (31). The lower surface of each magnet (20) can perform a stopper function by supporting it in an interviewed state, so that even if a strong rotational force of the hollow shaft (10) is generated when the hollow shaft motor is driven, the magnet (20) is prevented from coming off and rotating.

[0057] The above magnet positioning support member (30) has elasticity, so that when the ring-shaped support part (31) of the magnet positioning support member (30) is elastically spread along the outer circumferential surface of the hollow shaft housing (11) and is fitted, the fitting projection (33) is formed in a semicircular protrusion shape, so that it smoothly slides along the outer circumferential surface of the hollow shaft housing (11) and is elastically pressed into the circular fitting groove (11A) to be fitted, thereby maintaining the joint, so that when the hollow shaft (10) rotates, the hollow shaft housing (11) and the magnet positioning support member (30) do not rotate without each other and maintain a strong bonding force as an integral part, thereby preventing a decrease in the rotational force. If the fitting projection (33) is formed in a circular shape, it is difficult to accurately fit it into the circular fitting groove (11A), so it is preferable to form it in a semicircular shape, and the circular fitting groove (11A) is formed in a circular shape. It may be replaced with a fitting hole.

[0058] In the embodiment of the present invention, the elasticity of the support member (30) for positioning the magnet is utilized to flexibly push up from the bottom of the hollow shaft housing (11) and fit it in, thereby shortening the assembly process. Alternatively, the elasticity of the support member (30) for positioning the magnet may be utilized to flexibly push down from the top of the hollow shaft housing (11) and fit it in, or two support members (30) for positioning the magnet may be used at the top and bottom of the hollow shaft housing (11) and installed to face each other.

[0059] A plurality of fitting protrusions (41) protruding at equal intervals inwardly from the lower circumference of the rotor can (40) are pressed into a plurality of fitting grooves (34) formed at equal intervals on the outer circumferential surface of the ring-shaped support portion (31) of the magnet positioning support member (30) so that the magnet positioning support member (30) and the rotor can (40) are maintained in combination while wrapping and protecting the circumferential surface of the magnet (20), thereby shortening the assembly process between the rotor can (40) and the magnet positioning support member (30), and at the same time effectively preventing the magnet (20) and the magnet positioning support member (30) from being detached from the outside and from being rotated, thereby realizing a stable rotor (100).

[0060] FIG. 6 is a perspective view of a second embodiment of a rotor of a hollow shaft motor according to the present invention, FIG. 7 is an exploded perspective view of a second embodiment of a rotor of a hollow shaft motor according to the present invention, FIG. 8 is a partially excerpted perspective view of a second embodiment of a rotor of a hollow shaft motor according to the present invention, FIG. 9 is a cross-sectional view taken along line CC of FIG. 6, FIG. 10 is a cross-sectional view taken along line DD of FIG. 6, and FIG. 11 is a cross-sectional view taken along line E-E of FIG.

[0061] According to FIGS. 6 to 11, the second embodiment is identical to the overall configuration of the rotor (100) of the hollow shaft motor according to the first embodiment of the present invention illustrated in FIGS. 1 to 5, so the description of the configuration of each overlapping part is identical to that described in the first embodiment, so a detailed description is omitted.

[0062] In the second embodiment, it is preferable that one or more insertion projections (33) protruding from the inner surface of a ring-shaped support portion (31) constituting a magnet positioning support member (30) be guided upward along one or more insertion guide grooves (11B) formed in a hollow shaft housing (11) so that the semicircular insertion projections (33) are caught in the semicircle of the upper inner end of the insertion guide groove (11B) and are elastically pressed in so as to be inserted in a fitting manner so that the magnet positioning support member (30) is firmly coupled to the hollow shaft housing (11) and the upper inner end of the insertion guide groove (11B) is formed in a semicircle corresponding to the upper semicircle of the insertion projection (33) to expand the fitting area.

[0063] The above fitting guide groove (11B) is formed by extending from directly below the magnet (20) arranged on the outer circumferential surface of the hollow shaft housing (11) to the lower end of the lower circumferential surface of the hollow shaft housing (11), and the lower end of the fitting guide groove (11B) is formed as an open groove to easily provide insertion guidance of the fitting projection (33).

[0064] Accordingly, since the fitting projection (33) is guided quickly and easily along the fitting guide groove (11B) to achieve flexible fitting, easier rotor assembly can be achieved, a stable and accurate joining process can be performed, and the rotor assembly process can be efficiently shortened.

[0065] It should be noted that the above description of the present invention is merely provided as an example to facilitate understanding of the present invention and is not intended to define the scope of the present invention. The scope of protection of the present invention is defined by the appended claims, and all simple modifications or variations of the present invention within this scope should be construed as falling within the scope of protection of the present invention.

Claims

1. A plurality of magnets (20) arranged at equal intervals on the outer circumference of the hollow shaft housing (11); A support member (30) for positioning the magnets (20) and supporting each lower part of the magnets (20) while being inserted into the gap space (S) between the magnets (20); and A rotor can (40) that is combined with a support member (30) for magnet positioning and wraps and protects the outer peripheral surface of a plurality of magnets (20); Including, A rotor of a hollow shaft motor characterized in that a protrusion (33) protruding from the inside of a ring-shaped support portion (31) of a support member (30) for positioning the magnet is elastically fitted into a fitting groove (11A) formed in a hollow shaft housing (11) in a manner that the support member (30) for positioning the magnet is firmly fixed to the hollow shaft housing (11).

2. In the first paragraph, the support member (30) for positioning the magnet is an injection-molded product made of a synthetic resin material having elasticity, and includes a ring-shaped support member (31) that supports the magnet (20); A vertical support (32) for maintaining the magnet spacing, which is fitted into a plurality of magnet spacing spaces (S) that protrude upward at equal intervals from the ring-shaped support (31); A rotor of a hollow shaft motor characterized by including a protrusion (33) protruding from the inner surface of a ring-shaped support (31).

3. A rotor of a hollow shaft motor characterized in that a plurality of fitting grooves (34) are formed at equal intervals on the outer circumferential surface of the ring-shaped support portion (31) in the second paragraph.

4. A rotor of a hollow shaft motor, characterized in that in the first paragraph, one or more fitting projections (33) protruding from the inner surface of a ring-shaped support portion (31) of a magnet positioning support member (30) are fitted into one or more circular fitting grooves (11A) formed in the hollow shaft housing (11) below the magnet, so that the magnet positioning support member (30) is maintained in combination with the hollow shaft (10).

5. A hollow shaft motor rotor characterized in that, in the first paragraph, a plurality of fitting protrusions (41) protruding at equal intervals inwardly from the lower circumference of the rotor can (40) are pressed into a plurality of fitting grooves (34) formed at equal intervals on the outer circumference surface of the ring-shaped support portion (31) of the magnet positioning support member (30) so that the magnet positioning support member (30) and the rotor can (40) are maintained in combination, thereby wrapping and protecting the circumference surface of the magnet (20).

6. A plurality of magnets (20) arranged at equal intervals on the outer circumference of the hollow shaft housing (11); A support member (30) for positioning the magnets (20) and supporting each lower part of the magnets (20) while being inserted into the gap space (S) between the magnets (20); and A rotor can (40) that is combined with a support member (30) for magnet positioning and wraps and protects the outer peripheral surface of a plurality of magnets (20); A rotor of a hollow shaft motor, characterized in that the magnet positioning support member (30) is guided upwardly along the fitting guide groove (11B) formed in the hollow shaft housing (11) by including a fitting projection (33) protruding from the inside of the ring-shaped support portion (31) so that the fitting projection (33) is caught on the upper end of the fitting guide groove (11B) and is elastically pressed in so that the magnet positioning support member (30) is firmly connected to the hollow shaft housing (11) with a fitting fit.

7. In the 6th paragraph, the support member (30) for the magnet positioning arrangement is an injection-molded product made of a synthetic resin material having elasticity, and includes a ring-shaped support member (31) that supports the magnet (20); A vertical support (32) for maintaining the magnet spacing, which is fitted into a plurality of magnet spacing spaces (S) that protrude upward at equal intervals from the ring-shaped support (31); A rotor of a hollow shaft motor characterized by including a protrusion (33) protruding from the inner surface of a ring-shaped support (31).

8. A rotor of a hollow shaft motor characterized in that a plurality of fitting grooves (34) are formed at equal intervals on the outer circumferential surface of the ring-shaped support portion (31) in the 7th paragraph.

9. In the sixth paragraph, a rotor of a hollow shaft motor characterized in that one or more fitting projections (33) protruding from the inner surface of a ring-shaped support portion (31) of a magnet positioning support member (30) are guided and fitted into one or more circular fitting guide grooves (11B) formed in the hollow shaft housing (11) below the magnet (20), thereby maintaining the magnet positioning support member (30) in combination with the hollow shaft (10).

10. In the sixth paragraph, a plurality of fitting protrusions (41) protruding at equal intervals inwardly from the lower circumference of the rotor can (40) are pressed into a plurality of fitting grooves (34) formed at equal intervals on the outer circumferential surface of the ring-shaped support portion (31) of the magnet positioning support member (30) so that the magnet positioning support member (30) and the rotor can (40) are maintained in combination, thereby wrapping and protecting the circumferential surface of the magnet (20).

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