EP2801990A1 - Electric spindle, particularly for forming coils by winding a wire around a spool - Google Patents
Electric spindle, particularly for forming coils by winding a wire around a spool Download PDFInfo
- Publication number
- EP2801990A1 EP2801990A1 EP14167305.3A EP14167305A EP2801990A1 EP 2801990 A1 EP2801990 A1 EP 2801990A1 EP 14167305 A EP14167305 A EP 14167305A EP 2801990 A1 EP2801990 A1 EP 2801990A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spindle
- electric
- spindle shaft
- electric motor
- supporting element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/06—Coil winding
Definitions
- the present invention relates to an electric spindle, particularly for forming coils by winding a wire around a spool.
- the formation of coils by winding a wire about a spool is usually carried out using a spindle that is actuated by an electric motor and which makes the spool, on which the wire that is fed to the spool is to be wound, rotate about its own axis.
- Conventional electric spindles usually comprise a supporting element that supports the spindle shaft so that it can rotate about its own axis.
- Such shaft is actuated by an electric motor the body or enclosure of which is fixed to the supporting element in a cantilever fashion.
- an encoder Fixed to the other end of the electric motor body with respect to the supporting element is an encoder, the function of which is to control the rotation of the spindle shaft so as to allow adjustment of the rotation speed of the spindle shaft by means of a feedback control system.
- the aim of the present invention is to solve the above mentioned drawback by providing an electric spindle, particularly for forming coils by winding a wire around a spool, which is capable of reducing, to a considerable extent, the vibrations generated by the rotation of the spindle shaft so as to make it possible to achieve appreciably higher rotation speeds than those that can be achieved with conventional electric spindles.
- an object of the invention is to provide an electric spindle that makes it possible to achieve higher productivity levels with respect to those that can be achieved with conventional electric spindles.
- Another object of the invention is to provide an electric spindle that, even at high rotation speeds of the spindle shaft, ensures a high level of precision in the winding of the wire about the spool, thus ensuring a high level of quality in the finished product.
- a further object of the invention is to provide an electric spindle that prevents or substantially reduces problems of overheating and the onset of unwanted currents during winding.
- Another object of the invention is to provide an electric spindle that offers the highest guarantees of safety and reliability in use, and which can be produced at low cost.
- an electric spindle particularly for forming coils by winding a wire around a spool, comprising:
- the electric spindle generally designated by the reference numeral 1, comprises a supporting element 2 that supports, rotatably about its own axis 3a, a spindle shaft 3 that is connected to an electric motor 4 that can be actuated in order to cause the actuation, with a rotary motion about its own axis 3a relative to the supporting element 2, of the spindle shaft 3.
- the electric spindle in question comprises, furthermore, an encoder 5 which is connected to the spindle shaft 3 in order to control the rotation thereof.
- the encoder 5 is functionally connected to an electronic command and control element, conventional and not shown for the sake of simplicity, which oversees the operation of the electric spindle and which regulates the actuation of electric motor 4 as a function of the value read by the encoder 5 so as to maintain with precision the rotation speed of the spindle shaft 3 at a preset value.
- the body of the electric motor 4 and the body of the encoder 5 are connected directly to the supporting element 2.
- the term “directly” means that the electric motor body 4 and the body of the encoder 5 are both fixed to the supporting element 2 and that, in particular, the encoder 5 is not connected to the supporting element 2 by way of the electric motor body 4, as occurs in conventional electric spindles. This does not mean that there cannot be additional connection elements, such as for example blocks, inserts, spacers or the like, between the electric motor body 4 and the supporting element 2, and also between the body of the encoder 5 and the supporting element 2.
- the supporting element 2 and the electric motor body 4 are made in one piece i.e. the supporting element 2 also constitutes the electric motor body 4.
- the supporting element 2 is provided in the form of a housing, externally for example having an at least partly prismatic or parallelepiped shape, as illustrated, and, internally, having a cavity 7 that accommodates the stator 6 and the rotor 8 of the electric motor, the encoder 5 and the spindle shaft 3.
- the body or housing of the electric motor 4 is preferably constituted by the supporting element 2 proper. In this manner, the electric motor 4 and the encoder 5 are directly coupled inside a single body.
- the cavity 7 is conveniently substantially cylindrical and the spindle shaft 3 is arranged coaxially in such cavity 7.
- the spindle shaft 3 is intended to be connected with an axial end thereof, which is constituted by the left-hand end in Figures 1 and 4 , to a conventional spool-holder, not shown for the sake of simplicity.
- the spindle shaft 3 is supported, rotatably about its own axis 3a, within the cavity 7 by way of bearings 9, 10, 11 which are arranged proximate to the axial ends thereof.
- At least one of the bearings 9, 10 that are arranged proximate to the axial end of the spindle shaft 3 that is intended to be engaged with the spool of the coils to be produced is constituted by a ceramic ball bearing.
- the spindle shaft 3 is supported by way of a pair of ceramic ball bearings 9, 10.
- the spindle shaft 3 is supported by another ball bearing 11.
- the rotor 8 of the electric motor 4 is preferably arranged at an intermediate region of the axial extension of the spindle shaft 3 within the cavity 7.
- the rotor 8 of the electric motor 4 is fixed to a portion of the lateral surface of the spindle shaft 3 and the stator 6 of the electric motor 4 is fixed to the walls of the cavity 7 which face the rotor 8.
- the outer surface of the supporting element 2, at the stator 6 and the rotor 8 of the electric motor 4, is conveniently provided with fins 15 in order to facilitate the removal of heat.
- the encoder 5 is arranged around the spindle shaft 3 proximate to its other axial end with respect to its axial end that is intended to be connected to the spool of the coil to be produced.
- the encoder 5 is arranged outside the axial portion of the spindle shaft 3 which is arranged between the bearings 10, 11.
- the bearing 11 is arranged between the rotor 8 and the encoder 5.
- a device 12 is provided for the safety locking of the rotation of the spindle shaft 3.
- Such device 12 for safety locking comprises, in a way that is known per se, a star wheel 13 that is integral with the spindle shaft 3 in rotation about its own axis 3a and a locking element 14 that faces the star wheel 13 laterally and which can be engaged on command with one of the recesses of the star wheel 13.
- the particular manner with which the supporting element 2, the electric motor 4 and the encoder 5 are made and assembled considerably reduces vibrations and makes it possible to obtain fully satisfactory operation with high rotation speeds, even higher than 15,000 rpm.
- the electric spindle according to the invention fully achieves the set aim in that it can achieve without problems rotation speeds of the spindle shaft which are appreciably higher than those that can be achieved with conventional electric spindles, thus enabling the winding machine, on which it is installed, to attain considerable increases in production.
- Another advantage of the electric spindle according to the invention is that it can operate at high speeds without problems of overheating.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
- a supporting element (2);
- a spindle shaft (3) that is supported, so that it can rotate about its own axis (3a), by the supporting element (2);
- an electric motor (4) for actuating, with a rotary motion about its own axis (3a), the spindle shaft (3);
- an encoder (5) connected to the spindle shaft (3) in order to control its rotation,
the body of said electric motor (4) and the body of the encoder (5) being connected directly to the supporting element (2).
Description
- The present invention relates to an electric spindle, particularly for forming coils by winding a wire around a spool.
- As is known, the formation of coils by winding a wire about a spool is usually carried out using a spindle that is actuated by an electric motor and which makes the spool, on which the wire that is fed to the spool is to be wound, rotate about its own axis.
- In order to achieve increasingly high productivity levels, it is necessary to achieve increasingly higher spindle rotation speeds, even higher than 15,000 rpm.
- Achievement of this result, in conventional electric spindles, is impeded by the high vibrations that develop at such rotation speeds and which impede obtaining a precise winding and make the mounting of measurement devices on the winding machine difficult.
- Conventional electric spindles usually comprise a supporting element that supports the spindle shaft so that it can rotate about its own axis. Such shaft is actuated by an electric motor the body or enclosure of which is fixed to the supporting element in a cantilever fashion. Fixed to the other end of the electric motor body with respect to the supporting element is an encoder, the function of which is to control the rotation of the spindle shaft so as to allow adjustment of the rotation speed of the spindle shaft by means of a feedback control system.
- Such configuration of conventional electric spindles, as mentioned above, represents a limitation on reaching high rotation speeds of the spindle shaft, owing to the high vibrations that develop.
- The aim of the present invention is to solve the above mentioned drawback by providing an electric spindle, particularly for forming coils by winding a wire around a spool, which is capable of reducing, to a considerable extent, the vibrations generated by the rotation of the spindle shaft so as to make it possible to achieve appreciably higher rotation speeds than those that can be achieved with conventional electric spindles.
- Within this aim, an object of the invention is to provide an electric spindle that makes it possible to achieve higher productivity levels with respect to those that can be achieved with conventional electric spindles.
- Another object of the invention is to provide an electric spindle that, even at high rotation speeds of the spindle shaft, ensures a high level of precision in the winding of the wire about the spool, thus ensuring a high level of quality in the finished product.
- A further object of the invention is to provide an electric spindle that prevents or substantially reduces problems of overheating and the onset of unwanted currents during winding.
- Another object of the invention is to provide an electric spindle that offers the highest guarantees of safety and reliability in use, and which can be produced at low cost.
- This aim and these and other objects which will become better apparent hereinafter are achieved by an electric spindle, particularly for forming coils by winding a wire around a spool, comprising:
- a supporting element;
- a spindle shaft that is supported, so that it can rotate about its own axis, by said supporting element;
- an electric motor for actuating, with a rotary motion about its own axis, said spindle shaft;
- an encoder connected to said spindle shaft in order to control its rotation;
- Further characteristics and advantages of the invention will become better apparent from the description of a preferred, but not exclusive, embodiment of the electric spindle according to the invention, which is illustrated by way of non-limiting example in the accompanying drawings wherein:
-
Figure 1 schematically illustrates the electric spindle according to the invention in a partially sectional perspective view; -
Figure 2 is an end view of the electric spindle according to the invention, seen from an axial end thereof; -
Figure 3 is an end view of the electric spindle according to the invention, seen from the opposite axial end; -
Figure 4 is a schematic axial cross-sectional view of the electric spindle according to the invention, taken along the line IV-IV inFigure 3 . - With reference to the figures, the electric spindle according to the invention, generally designated by the
reference numeral 1, comprises a supportingelement 2 that supports, rotatably about itsown axis 3a, aspindle shaft 3 that is connected to an electric motor 4 that can be actuated in order to cause the actuation, with a rotary motion about itsown axis 3a relative to the supportingelement 2, of thespindle shaft 3. - The electric spindle in question comprises, furthermore, an
encoder 5 which is connected to thespindle shaft 3 in order to control the rotation thereof. Theencoder 5 is functionally connected to an electronic command and control element, conventional and not shown for the sake of simplicity, which oversees the operation of the electric spindle and which regulates the actuation of electric motor 4 as a function of the value read by theencoder 5 so as to maintain with precision the rotation speed of thespindle shaft 3 at a preset value. - According to the invention, the body of the electric motor 4 and the body of the
encoder 5 are connected directly to the supportingelement 2. - The term "directly" means that the electric motor body 4 and the body of the
encoder 5 are both fixed to the supportingelement 2 and that, in particular, theencoder 5 is not connected to the supportingelement 2 by way of the electric motor body 4, as occurs in conventional electric spindles. This does not mean that there cannot be additional connection elements, such as for example blocks, inserts, spacers or the like, between the electric motor body 4 and the supportingelement 2, and also between the body of theencoder 5 and the supportingelement 2. - Preferably, the supporting
element 2 and the electric motor body 4 are made in one piece i.e. the supportingelement 2 also constitutes the electric motor body 4. - More specifically, the supporting
element 2 is provided in the form of a housing, externally for example having an at least partly prismatic or parallelepiped shape, as illustrated, and, internally, having acavity 7 that accommodates thestator 6 and therotor 8 of the electric motor, theencoder 5 and thespindle shaft 3. - In substance, in the electric spindle according to the invention, the body or housing of the electric motor 4 is preferably constituted by the supporting
element 2 proper. In this manner, the electric motor 4 and theencoder 5 are directly coupled inside a single body. - The
cavity 7 is conveniently substantially cylindrical and thespindle shaft 3 is arranged coaxially insuch cavity 7. - The
spindle shaft 3 is intended to be connected with an axial end thereof, which is constituted by the left-hand end inFigures 1 and4 , to a conventional spool-holder, not shown for the sake of simplicity. - The
spindle shaft 3 is supported, rotatably about itsown axis 3a, within thecavity 7 by way ofbearings - Advantageously, at least one of the
bearings spindle shaft 3 that is intended to be engaged with the spool of the coils to be produced is constituted by a ceramic ball bearing. - Preferably, proximate to the axial end thereof that is intended to be engaged with the spool of the coil to be produced, the
spindle shaft 3 is supported by way of a pair ofceramic ball bearings - Proximate to the other axial end thereof, the
spindle shaft 3 is supported by another ball bearing 11. - The
rotor 8 of the electric motor 4 is preferably arranged at an intermediate region of the axial extension of thespindle shaft 3 within thecavity 7. - Advantageously, the
rotor 8 of the electric motor 4 is fixed to a portion of the lateral surface of thespindle shaft 3 and thestator 6 of the electric motor 4 is fixed to the walls of thecavity 7 which face therotor 8. - The outer surface of the supporting
element 2, at thestator 6 and therotor 8 of the electric motor 4, is conveniently provided withfins 15 in order to facilitate the removal of heat. - The
encoder 5 is arranged around thespindle shaft 3 proximate to its other axial end with respect to its axial end that is intended to be connected to the spool of the coil to be produced. - Preferably, the
encoder 5 is arranged outside the axial portion of thespindle shaft 3 which is arranged between thebearings bearing 11 is arranged between therotor 8 and theencoder 5. - For completeness of description, it should be noted that a
device 12 is provided for the safety locking of the rotation of thespindle shaft 3. -
Such device 12 for safety locking comprises, in a way that is known per se, astar wheel 13 that is integral with thespindle shaft 3 in rotation about itsown axis 3a and alocking element 14 that faces thestar wheel 13 laterally and which can be engaged on command with one of the recesses of thestar wheel 13. - Operation of the electric spindle according to the invention is evident from what is described and explained above. In essence, the actuation of the electric motor 4 causes the rotation of the
spindle shaft 3 about itsown axis 3a relative to the supportingelement 2. The rotation speed of thespindle shaft 3 is detected by theencoder 5 which is connected, as said above, in a way that is known per se, to an electronic command and control element that, if the rotation speed of thespindle shaft 3 drifts away from the preset speed, intervenes on the electric motor 4 so as to return the speed to the desired value. - In the electric spindle according to the invention, the particular manner with which the supporting
element 2, the electric motor 4 and theencoder 5 are made and assembled considerably reduces vibrations and makes it possible to obtain fully satisfactory operation with high rotation speeds, even higher than 15,000 rpm. - Furthermore, the use of ceramic bearings in order to support the spindle shaft makes it possible to contain the development of heat and thus to prevent the overheating of the electric spindle even at high rotation speeds.
- In practice it has been found that the electric spindle according to the invention fully achieves the set aim in that it can achieve without problems rotation speeds of the spindle shaft which are appreciably higher than those that can be achieved with conventional electric spindles, thus enabling the winding machine, on which it is installed, to attain considerable increases in production.
- Another advantage of the electric spindle according to the invention is that it can operate at high speeds without problems of overheating.
- The electric spindle, thus conceived, is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims. Moreover, all the details may be substituted by other, technically equivalent elements.
- In practice the materials employed, provided they are compatible with the specific use, and the dimensions, may be any according to requirements and to the state of the art.
- The disclosures in Italian Patent Application No.
MI2013A000771 - Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.
Claims (10)
- An electric spindle, particularly for forming coils by winding a wire around a spool, comprising:- a supporting element (2);- a spindle shaft (3) that is supported, so that it can rotate about its own axis (3a), by said supporting element (2);- an electric motor (4) for actuating, with a rotary motion about its own axis (3a), said spindle shaft (3);- an encoder (5) connected to said spindle shaft (3) in order to control its rotation;
characterized in that the body of said electric motor (4) and the body of said encoder (5) are connected directly to said supporting element (2). - The electric spindle according to claim 1, characterized in that said supporting element (2) constitutes the body of said electric motor (4).
- The electric spindle according to claims 1 and 2, characterized in that said supporting element (2) is provided in the form of a box-like enclosure in which there is a cavity (7) that accommodates the stator (6) and the rotor (8) of the electric motor (4), said encoder (5) and said spindle shaft (3).
- The electric spindle according to one or more of the preceding claims, characterized in that the rotor (8) of said electric motor (4) is fixed to a portion of the lateral surface of said spindle shaft (3) and the stator (6) of said electric motor (4) is fixed to the side walls of said cavity (7) which face said rotor (8).
- The electric spindle according to one or more of the preceding claims, characterized in that said rotor (8) of the electric motor (4) is arranged at an intermediate region of the axial extension of said spindle shaft (3) in said cavity (7).
- The electric spindle according to one or more of the preceding claims, characterized in that said spindle shaft (3) is supported so that it can rotate about its own axis (3a) inside said cavity (7) by way of bearings (9, 10, 11), at least some of said bearings (9, 10, 11) being constituted by ceramic bearings.
- The electric spindle according to one or more of the preceding claims, characterized in that said spindle shaft (3) is supported so that it can rotate about its own axis (3a) inside said cavity (7), proximate to its axial end intended to be engaged with the spool of the coils to be produced, by at least one ceramic bearing (9, 10).
- The electric spindle according to one or more of the preceding claims, characterized in that said encoder (5) is arranged proximate to the axial end of said spindle shaft (3) that is opposite with respect to its axial end intended to be connected to the spool of the coil to be produced.
- The electric spindle according to one or more of the preceding claims, characterized in that between said rotor (8) of the electric motor (4) and said encoder (5), said spindle shaft (3) is supported by an additional bearing (11) that is interposed between said spindle shaft (3) and the side walls of said cavity (7).
- The electric spindle according to one or more of the preceding claims, characterized in that it comprises a device (12) for the safety locking of the rotation of said spindle shaft (3).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000771A ITMI20130771A1 (en) | 2013-05-10 | 2013-05-10 | ELECTRO-SPINDLE, PARTICULARLY FOR THE FORMATION OF COILS THROUGH THE WINDING OF A THREAD AROUND A ROCKET. |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2801990A1 true EP2801990A1 (en) | 2014-11-12 |
Family
ID=48670696
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14167305.3A Withdrawn EP2801990A1 (en) | 2013-05-10 | 2014-05-07 | Electric spindle, particularly for forming coils by winding a wire around a spool |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2801990A1 (en) |
IT (1) | ITMI20130771A1 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201918836U (en) * | 2010-05-06 | 2011-08-03 | 宁波市镇海众鑫数控(自动化)机床厂 | Electric spindle with detecting device capable of eliminating axial displacement |
CN202028775U (en) * | 2011-03-17 | 2011-11-09 | 常州克迈特数控科技有限公司 | Spindle of high speed direct-connected machining center |
CN102389984A (en) * | 2010-11-18 | 2012-03-28 | 西安合升动力科技有限公司 | Compound permanent-magnetic synchronous electric spindle used for turning, milling and grinding |
CN102394536A (en) * | 2010-11-18 | 2012-03-28 | 西安合升动力科技有限公司 | Permanent magnet synchronous grinding electric spindle |
CN202343961U (en) * | 2011-11-15 | 2012-07-25 | 山东宏康机械制造有限公司 | Electric main shaft for lathe |
CN202479516U (en) * | 2012-02-06 | 2012-10-10 | 徐松茂 | Mounting structure of water cooling headstock of multistage frequency conversion electric spindle of numerical control machine tool |
EP2514556A1 (en) * | 2011-04-21 | 2012-10-24 | BIESSE S.p.A. | Operating head for processing wood components or the like |
-
2013
- 2013-05-10 IT IT000771A patent/ITMI20130771A1/en unknown
-
2014
- 2014-05-07 EP EP14167305.3A patent/EP2801990A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201918836U (en) * | 2010-05-06 | 2011-08-03 | 宁波市镇海众鑫数控(自动化)机床厂 | Electric spindle with detecting device capable of eliminating axial displacement |
CN102389984A (en) * | 2010-11-18 | 2012-03-28 | 西安合升动力科技有限公司 | Compound permanent-magnetic synchronous electric spindle used for turning, milling and grinding |
CN102394536A (en) * | 2010-11-18 | 2012-03-28 | 西安合升动力科技有限公司 | Permanent magnet synchronous grinding electric spindle |
CN202028775U (en) * | 2011-03-17 | 2011-11-09 | 常州克迈特数控科技有限公司 | Spindle of high speed direct-connected machining center |
EP2514556A1 (en) * | 2011-04-21 | 2012-10-24 | BIESSE S.p.A. | Operating head for processing wood components or the like |
CN202343961U (en) * | 2011-11-15 | 2012-07-25 | 山东宏康机械制造有限公司 | Electric main shaft for lathe |
CN202479516U (en) * | 2012-02-06 | 2012-10-10 | 徐松茂 | Mounting structure of water cooling headstock of multistage frequency conversion electric spindle of numerical control machine tool |
Also Published As
Publication number | Publication date |
---|---|
ITMI20130771A1 (en) | 2014-11-11 |
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