US20140312717A1 - Ironless magnetic linear motors having levitating and transversal force capacities - Google Patents
Ironless magnetic linear motors having levitating and transversal force capacities Download PDFInfo
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- US20140312717A1 US20140312717A1 US14/323,449 US201414323449A US2014312717A1 US 20140312717 A1 US20140312717 A1 US 20140312717A1 US 201414323449 A US201414323449 A US 201414323449A US 2014312717 A1 US2014312717 A1 US 2014312717A1
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- 238000005339 levitation Methods 0.000 claims abstract description 35
- 230000004044 response Effects 0.000 claims abstract description 7
- 239000013256 coordination polymer Substances 0.000 abstract description 4
- 230000010363 phase shift Effects 0.000 description 13
- 230000008901 benefit Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000003491 array Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
- H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/035—DC motors; Unipolar motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/02—Machines with one stator and two or more rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/18—Machines moving with multiple degrees of freedom
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/47—Air-gap windings, i.e. iron-free windings
Definitions
- the present invention generally relates to ironless magnetic linear motors.
- the present invention specifically relates to generating two or more controllable orthogonal forces in an ironless magnetic linear motor.
- FIGS. 1-4 illustrate a ironless magnetic linear motor 20 employing a magnetic track 30 and a forcer 40 .
- Magnetic track 30 includes a linear magnetic array 31 and a linear magnetic array 32 for generating a magnetic field ⁇ across a linear air gap as best shown in FIG. 3 .
- Linear magnetic arrays 31 and 32 have 180° degree spatial separation between adjacent magnets.
- Forcer 40 is disposed within the linear air gap along a center X-Z longitudinal plane CP of the linear air gap as best shown in FIG. 2 , and includes three (3) coils 41 - 43 with a 120°+n*360 degree spatial separation (n is an arbitrary integer) between adjacent coils.
- coil 41 is represented by its flow path for a commutation drive current I X1
- coil 42 is represented by its flow path for a commutation drive current I X2
- coil 43 is represented by its flow path for a commutation drive current I X3 .
- Opposing sets of drive turns of coils 41 - 43 orthogonal to a X drive axis of linear air gap and parallel to a Z levitation axis of linear air gap are internal to magnetic field ⁇ as best shown in FIGS. 2 and 4 .
- Opposing sets of levitating turns of coils 41 - 43 parallel to the X drive axis and orthogonal to the Z levitation axis are external to magnetic field ⁇ as best shown in FIG.
- an application of a 120° phase shift PS1 of commutation drive currents I X1 , I X2 and I X3 to coils 41 - 43 respectively, exclusively generates a drive force F X parallel to the X drive axis as best shown in FIG. 5 .
- a drawback of the structural configuration of ironless magnetic linear motor 20 is its inability to generate a substantially independent levitating force F Z parallel to the Z levitating axis as best shown in FIG. 5 and its inability to generate a substantially independent transversal force F Y parallel to the Y transversal axis of the linear air gap as best shown in FIG. 5 .
- the present invention provides a new and improved ironless magnetic linear motor implementing a new orientation of forcer 40 within the linear air gap of magnetic track 30 to thereby facilitate a superimposition of a commutation levitation current I Z and/or a commutation transversal current I Y on the commutation drive current I X for each coil of forcer 40 .
- one set of levitating turns of a coil parallel to the X drive axis and orthogonal to the Z levitation axis is internal to magnetic field
- an opposing set of levitating turns of a coil parallel to the X drive axis and orthogonal to the Z levitation axis is external to magnetic field.
- a commutation drive current is applied to the coil to generate a drive force parallel to the X drive axis and orthogonal to the Z levitation axis.
- a commutation levitating current is superimposed on and phase shifted from the commutation drive current to generate a levitating force orthogonal to the X drive axis and parallel to the Z levitation axis.
- a coil of the forcer is offset from a center X-Z longitudinal plane of the linear air gap.
- a commutation drive current is applied to the coil to generate a drive force parallel to the X drive axis and orthogonal to the Y transversal axis.
- a commutation transversal current is superimposed on and phase shifted from the commutation drive current to generate a transversal force orthogonal to the X drive axis and parallel to the Y transversal axis.
- a commutation drive current is applied to a coil of the forcer to generate a drive force parallel to the X drive axis.
- the forcer is orientated with the linear air gap to generate a force orthogonal to the X drive axis in response to an additional commutation coil current being superimposed on and phase shifted from the commutation drive current.
- FIG. 1 illustrates a view of an ironless magnetic linear motor in a X-Z plane as known in the art
- FIG. 2 illustrates a view of the ironless magnetic linear motor of FIG. 1 in a Y-Z plane
- FIG. 3 illustrates a view of a linear air gap of a magnetic track of FIG. 1 in a X-Y plane
- FIG. 4 illustrates a view of an application of commutation drive currents to coils of a forcer of FIG. 1 in a X-Z plane;
- FIG. 5 illustrates exemplary commutation drive currents applied to a forcer of FIG. 1 and an exemplary drive force generated by the forcer in response to the commutation drive currents as known in the art;
- FIG. 6 illustrates a view of an ironless magnetic linear motor in a Y-Z plane in accordance with a first embodiment of the present invention
- FIG. 7 illustrates a view of an application of commutation levitating currents to a forcer of FIG. 6 in a X-Z plane in accordance with the present invention
- FIG. 8 illustrates exemplary commutation levitating currents applied to the forcer of FIG. 7 and an exemplar levitation force generated by the forcer in response to the commutation levitating currents in accordance with the present invention
- FIG. 9 illustrates a view of an application of superimposed commutation drive currents and commutation levitating currents to the forcer of FIG. 7 in a X-Z plane in accordance with the present invention
- FIG. 10 illustrates exemplary phase shifting of commutation drive currents and commutation levitating currents as applied to the forcer of FIG. 9 in accordance with the present invention
- FIG. 11 illustrates a view of an ironless magnetic linear motor in a Y-Z plane in accordance with a second embodiment of the present invention
- FIG. 12 illustrates a view of an application of superimposed commutation drive currents and commutation levitating currents to a forcer of FIG. 11 in a X-Z plane in accordance with the present invention
- FIGS. 13 and 14 illustrate views of an ironless magnetic linear motor in a Y-Z plane in accordance with a third embodiment of the present invention
- FIG. 15 illustrates a view of an application of commutation transversal currents to a forcer of FIGS. 13 and 14 in a X-Z plane in accordance with the present invention
- FIG. 16 illustrates exemplary commutation transversal currents applied to a forcer of FIG. 15 and an exemplary transversal force generated by the forcer in response to the commutation transversal currents in accordance with the present invention
- FIG. 17 illustrates a view of an application of superimposed commutation drive currents and commutation transversal currents to the forcer of FIG. 2 in a X-Z plane in accordance with the present invention
- FIG. 18 illustrates exemplary phase shifting of commutation drive currents and commutation transversal currents as applied to the forcer of FIG. 17 ;
- FIG. 19 illustrates a commutation current superimposition/phase shifting control system in accordance with a fourth embodiment of the present invention.
- FIG. 20 illustrates a first exemplary mechanical coupling of a pair of ironless magnetic linear motor of the present invention to an object
- FIG. 21 illustrates a second exemplary mechanical coupling a pair of ironless magnetic linear motor of the present invention to an object
- FIG. 22 illustrates a view of an ironless magnetic linear motor of FIG. 21 in a X-Z plane
- FIG. 23 illustrates a third exemplary mechanical coupling a pair of ironless magnetic linear motor of the present invention to an object
- FIG. 24 illustrates a view of a mechanical coupling of a pair of ironless magnetic linear motor of FIG. 23 in a X-Z plane.
- an ironless magnetic linear motor 21 of the present invention employing magnetic track 30 and forcer 40 with forcer 40 having a new and unique orientation within the linear air gap.
- forcer 40 is disposed within the linear air gap along a center X-Z longitudinal plane CP of the linear air gap as best shown in FIG. 6 .
- coil 41 of forcer 40 is represented by its flow path for a commutation levitating current I Z1
- coil 42 is of forcer 40 is represented by its flow path for a commutation levitating current I Z2
- coil 43 of forcer 40 is represented by its flow path for a commutation levitating current I Z3 .
- Opposing sets of drive turns of coils 41 - 43 orthogonal to the X drive axis and parallel to the Z levitation axis are internal to magnetic field ⁇ as best shown in FIG. 7 .
- One set of levitating turns of coils 41 - 43 parallel to the X drive axis and orthogonal to the Z levitation axis from a bottom perspective of FIG. 7 is external to magnetic field ⁇
- the opposing set of levitating turns of coils 41 - 43 parallel to the X drive axis and orthogonal to the Z levitation axis from a top perspective of FIG. 7 is internal to magnetic field ⁇ .
- the present invention provides for a phase shifting of a superimposition of commutation levitating currents I Z1 , I Z2 and I Z3 on commutation drive currents I X1 , I X2 and I X3 , respectively, to facilitate a maximum decoupling, if not a complete decoupling, of drive force F X ( FIG. 5 ) and levitating force F Z ( FIG. 8 ).
- coil 41 of forcer 40 is represented by its flow path for a superimposition of commutation levitating current I Z1 on commutation drive coil I X1
- coil 42 of forcer 40 is represented by its flow path for a superimposition of commutation levitating current I Z2 on commutation drive coil I X2
- coil 43 of forcer 40 is represented by its flow path for a superimposition of commutation levitating current I Z3 on commutation drive coil I X3 .
- commutation levitating current I Z1 is phase shifted from commutation drive coil I X1 by a 90° phase shift PS2
- commutation levitating current I Z2 is phase shifted from commutation drive coil I X2 by 90° phase shift PS2
- commutation levitating current I Z3 is phase shifted from commutation drive coil I X3 by 90° phase shift PS2.
- an ironless magnetic linear motor 22 of the present invention employing magnetic track 30 and forcer 40 with forcer 40 having a opposite orientation within the linear air gap as compared to the forcer 40 orientation of the linear air gap of motor 21 ( FIG. 6 ).
- opposing sets of drive turns of coils 41 - 43 orthogonal to the X drive axis and parallel to the Z levitation axis are internal to magnetic field ⁇ as best shown in FIG. 12 .
- the present invention provides for a phase shifting of a superimposition of commutation levitating currents I Z1 , I Z2 and I Z3 on commutation drive currents I X1 , I X2 and I X3 , respectively, to facilitate a minimal decoupling, if not a complete decoupling, of drive force F X ( FIG. 5 ) and levitating force F Z ( FIG. 8 ).
- a phase shifting of a superimposition of commutation levitating currents I Z1 , I Z2 and I Z3 on commutation drive currents I X1 , I X2 and I X3 respectively, to facilitate a minimal decoupling, if not a complete decoupling, of drive force F X ( FIG. 5 ) and levitating force F Z ( FIG. 8 ).
- coil 41 of forcer 40 is represented by its flow path for a superimposition of commutation levitating current I Z1 on commutation drive coil I X1
- coil 42 of forcer 40 is represented by its flow path for a superimposition of commutation levitating current I Z2 on commutation drive coil I X2
- coil 43 of forcer 40 is represented by its flow path for a superimposition of commutation levitating current I Z3 on commutation drive coil I X3 .
- commutation levitating current I Z1 is phase shifted from commutation drive coil I X1 by a 90° phase shift PS2
- commutation levitating current I Z2 is phase shifted from commutation drive coil I X2 by 90° phase shift PS2
- commutation levitating current I Z3 is phase shifted from commutation drive coil I X3 by 90° phase shift PS2.
- an ironless magnetic linear motor 23 of the present invention employing magnetic track 30 and forcer 40 with forcer 40 having a new and unique orientation within the linear air gap.
- forcer 40 is disposed within the linear air gap at an offset to center X-Z longitudinal plane CP of the linear air gap as best shown in FIGS. 13 and 14 .
- coil 41 of forcer 40 is represented by its flow path for a commutation levitating current I Y1
- coil 42 is of forcer 40 is represented by its flow path for a commutation levitating current I Y2
- coil 43 of forcer 40 is represented by its flow path for a commutation levitating current I Y3 .
- Opposing sets of drive turns of coils 41 - 43 orthogonal to the X drive axis and parallel to the Z levitation axis are internal to magnetic field ⁇ as best shown in FIG. 15 .
- Opposing sets of levitating turns of coils 41 - 43 parallel to the X drive axis and orthogonal to the Z levitation axis are external to magnetic field ⁇ as best shown in FIG. 15 .
- an application of a 120° phase shift PS1 of commutation transversal currents I Y1 , I Y2 and I Y3 to coils 41 - 43 respectively, generates a transversal force F Y parallel to the Y transversal axis as best shown in FIG. 16 .
- the present invention provides for a phase shifting of a superimposition of commutation transversal currents I Y1 , I Y2 and I Y3 on commutation drive currents I X1 , I X2 and I X3 , respectively, to facilitate a minimal decoupling, if not a complete decoupling, of drive force F X ( FIG. 5 ) and transversal force F Y ( FIG. 16 ).
- drive force F X FIG. 5
- transversal force F Y FIG. 16
- coil 41 of forcer 40 is represented by its flow path for a superimposition of commutation transversal current I Y1 on commutation drive coil I X1
- coil 42 of forcer 40 is represented by its flow path for a superimposition of commutation transversal current I Y2 on commutation drive coil I X2
- coil 43 of forcer 40 is represented by its flow path for a superimposition of commutation transversal current I Y3 on commutation drive coil I X3 .
- commutation transversal current I Y1 is phase shifted from commutation drive coil I X1 by a 90° phase shift PS2
- commutation transversal current I Y2 is phase shifted from commutation drive coil I X2 by 90° phase shift PS2
- commutation transversal current Y Y3 is phase shifted from commutation drive coil I X3 by 90° phase shift PS2.
- a commutation current superimposition/phase shifting control system 50 of the present invention employing M number of forcer position sensors 51 , where M ⁇ 1, and a commutation current generator 52 .
- Sensor(s) 51 operate to measure the relative position (up to 360 spatial degrees) of coils of a forcer within the magnetic field generated by the linear arrays of magnets within the linear air gap of the magnetic track.
- sensor(s) 51 are position transducers strategically positioned relative to the forcer to thereby provide signals FPS indicative of a position of coils of a forcer within the magnetic field in view of the structural configurations of the magnetic track and the force.
- sensor(s) 51 are magnetic flux sensors (e.g., Hall sensors) strategically positioned relative to the forcer within the magnetic field to thereby provide signals FPS indicative of a position of coils of a forcer within the magnetic field in view of the structural configurations of the magnetic track and the forcer.
- Commutation current generator 52 operates to provide a phase shifting of a N number of superimposition of commutation levitating currents I Z on respective commutation drive currents I X and/or a phase shifting of a N number of superimposition of commutation transversals currents I Y on respective commutation drive currents I X as shown in FIG. 19 .
- This operation of generator 52 is in accordance with new and unique superimposition/phase shifting commutation algorithm designed in view of the structural configurations and relative orientations of the magnetic track, the forcer and sensors 51 .
- phase shifting/superimposition inventive principles of the present invention in the context of (1) the numerous variations in a structural configuration of a magnetic track, (2) the numerous variations in a structural configuration of a forcer, (3) the numerous variations in the orientation of a forcer in a linear air gap of a magnetic track in accordance with the present invention, (4) the numerous variations in a structural configuration of forcer position sensors, (5) the phase shifting range for commutation coil currents of the same type, (6) the phase shifting range for commutation coil currents of a dissimilar types and (7) the implementation of a positive slope and/or a negative slope for the commutation coil currents.
- a pair of ironless magnetic linear motors 23 ( FIGS. 13-15 ) are mechanically coupled in an eccentric to opposing sides of an object 60 whereby motors 23 can be operated to selectively move object 60 in an X drive direction of their respective linear air gaps and in a Y transversal direction of their respective linear air gaps.
- a pair of ironless magnetic linear motors 24 are mechanically coupled in an eccentric to opposing sides of an object 61 .
- Each motor 24 includes a pair of magnetic tracks 30 mechanically coupled to align their respective linear air gaps as an integrated linear air gap.
- Each motor 24 further includes pair of outside forcers 40 (O) within the integrated linear air gap to selectively generate a drive force F X , a levitation force F Z , a drive torque R X , a levitating torque R Y and a transversal torque R Z .
- Each motor 24 further includes an internal forcer 40 (I) within the integrated linear air gap to selectively generate a drive force F X , a transversal force F Y , and levitating torque R Z .
- the result is a six (6) degree of freedom control of object 61 relative to a coordinate system of object 61 with a long stroke of object 61 along the X drive axis of the integrated linear air gaps of motors 24 and shorts strokes of object 61 along the Z levitating axes and the Y transversal axes of the integrated linear air gaps of motors 24 .
- a pair of ironless magnetic linear motors 25 of the present invention are mechanically coupled in an eccentric to opposing sides of an object 62 with each motor 25 having an ironless magnetic linear motor 26 of the present invention being mechanically coupled thereto.
- Each motor 25 and motor 26 includes a pair of magnetic tracks 30 mechanically coupled to align their respective linear air gaps as a an integrated linear air gap.
- Each motor 25 further includes pair of forces 40 within the integrated linear air gap to selectively generate a drive force F X , a levitation force F Z , a drive torque R X , a levitating torque R Y and a transversal torque R Z .
- Each motor 26 further includes a single forcer 40 within the integrated linear air gap to selectively generate a drive force F X , and a transversal force F Y .
- the result is a six (6) degree of freedom control of object 62 relative to a coordinate system of object 62 with a long stroke of object 62 along the X drive axis of the integrated linear air gaps of motors 24 and shorts strokes of object 62 along the Z levitating axes and the Y transversal axes of the integrated linear air gaps of motors 24 .
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Abstract
A ironless magnetic motor (21-23) employs a magnetic track (30) and a forcer (40). The forcer (40) is orientated in relations to a magnetic field (β) across a linear air gap of the magnetic track (30) to generate a drive force (FX) parallel to the X drive axis and orthogonal to the Z levitation axis in response to a commutation drive current (IX) and to generate a force (FZ, FY) orthogonal to the X drive axis in response to a commutation coil current (IZ, IY) being superimposed on and phase shifted from the commutation drive current (IX). To this end, a set of levitating turns of the coil (41) parallel to the X drive axis and orthogonal to the Z levitation axis may be internal or external to magnetic field (β), and the forcer (40) may be centered or offset from a center X-Z longitudinal axis (CP) of the linear air gap.
Description
- This application claims the benefit or priority of and describes the relationships between the following applications: wherein this application is a continuation of U.S. patent application Ser. No. 12/064,967, filed Feb. 27, 2008, which is the National Stage of International Application No. PCT/1B2006/052772, filed Aug. 29, 2005, which claims benefit of U.S.
provisional application 60/712,233 filed Aug. 29, 2005, all of which are incorporated herein in whole by reference. - The present invention generally relates to ironless magnetic linear motors. The present invention specifically relates to generating two or more controllable orthogonal forces in an ironless magnetic linear motor.
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FIGS. 1-4 illustrate a ironless magneticlinear motor 20 employing amagnetic track 30 and aforcer 40.Magnetic track 30 includes a linearmagnetic array 31 and a linearmagnetic array 32 for generating a magnetic field β across a linear air gap as best shown inFIG. 3 . Linearmagnetic arrays -
Forcer 40 is disposed within the linear air gap along a center X-Z longitudinal plane CP of the linear air gap as best shown inFIG. 2 , and includes three (3) coils 41-43 with a 120°+n*360 degree spatial separation (n is an arbitrary integer) between adjacent coils. As shown inFIG. 4 ,coil 41 is represented by its flow path for a commutation drive current IX1,coil 42 is represented by its flow path for a commutation drive current IX2 andcoil 43 is represented by its flow path for a commutation drive current IX3. - Opposing sets of drive turns of coils 41-43 orthogonal to a X drive axis of linear air gap and parallel to a Z levitation axis of linear air gap are internal to magnetic field β as best shown in
FIGS. 2 and 4 . Opposing sets of levitating turns of coils 41-43 parallel to the X drive axis and orthogonal to the Z levitation axis are external to magnetic field β as best shown in FIG. As a result, an application of a 120° phase shift PS1 of commutation drive currents IX1, IX2 and IX3to coils 41-43, respectively, exclusively generates a drive force FX parallel to the X drive axis as best shown inFIG. 5 . - A drawback of the structural configuration of ironless magnetic
linear motor 20 is its inability to generate a substantially independent levitating force FZ parallel to the Z levitating axis as best shown inFIG. 5 and its inability to generate a substantially independent transversal force FY parallel to the Y transversal axis of the linear air gap as best shown inFIG. 5 . To overcome these drawbacks, the present invention provides a new and improved ironless magnetic linear motor implementing a new orientation offorcer 40 within the linear air gap ofmagnetic track 30 to thereby facilitate a superimposition of a commutation levitation current IZ and/or a commutation transversal current IY on the commutation drive current IX for each coil offorcer 40. - In a first form of the present invention, one set of levitating turns of a coil parallel to the X drive axis and orthogonal to the Z levitation axis is internal to magnetic field, and an opposing set of levitating turns of a coil parallel to the X drive axis and orthogonal to the Z levitation axis is external to magnetic field. A commutation drive current is applied to the coil to generate a drive force parallel to the X drive axis and orthogonal to the Z levitation axis. A commutation levitating current is superimposed on and phase shifted from the commutation drive current to generate a levitating force orthogonal to the X drive axis and parallel to the Z levitation axis.
- In a second form of the present invention, a coil of the forcer is offset from a center X-Z longitudinal plane of the linear air gap. A commutation drive current is applied to the coil to generate a drive force parallel to the X drive axis and orthogonal to the Y transversal axis. A commutation transversal current is superimposed on and phase shifted from the commutation drive current to generate a transversal force orthogonal to the X drive axis and parallel to the Y transversal axis.
- In a third form of the present invention, a commutation drive current is applied to a coil of the forcer to generate a drive force parallel to the X drive axis. The forcer is orientated with the linear air gap to generate a force orthogonal to the X drive axis in response to an additional commutation coil current being superimposed on and phase shifted from the commutation drive current.
- The foregoing forms and other forms of the present invention as well as various features and advantages of the present invention will become further apparent from the following detailed description of various embodiments of the present invention read in conjunction with the accompanying drawings. The detailed description and drawings are merely illustrative of the present invention rather than limiting, the scope of the present invention being defined by the appended claims and equivalents thereof.
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FIG. 1 illustrates a view of an ironless magnetic linear motor in a X-Z plane as known in the art; -
FIG. 2 illustrates a view of the ironless magnetic linear motor ofFIG. 1 in a Y-Z plane; -
FIG. 3 illustrates a view of a linear air gap of a magnetic track ofFIG. 1 in a X-Y plane; -
FIG. 4 illustrates a view of an application of commutation drive currents to coils of a forcer ofFIG. 1 in a X-Z plane; -
FIG. 5 illustrates exemplary commutation drive currents applied to a forcer ofFIG. 1 and an exemplary drive force generated by the forcer in response to the commutation drive currents as known in the art; -
FIG. 6 illustrates a view of an ironless magnetic linear motor in a Y-Z plane in accordance with a first embodiment of the present invention; -
FIG. 7 illustrates a view of an application of commutation levitating currents to a forcer ofFIG. 6 in a X-Z plane in accordance with the present invention; -
FIG. 8 illustrates exemplary commutation levitating currents applied to the forcer ofFIG. 7 and an exemplar levitation force generated by the forcer in response to the commutation levitating currents in accordance with the present invention; -
FIG. 9 illustrates a view of an application of superimposed commutation drive currents and commutation levitating currents to the forcer ofFIG. 7 in a X-Z plane in accordance with the present invention; -
FIG. 10 illustrates exemplary phase shifting of commutation drive currents and commutation levitating currents as applied to the forcer ofFIG. 9 in accordance with the present invention; -
FIG. 11 illustrates a view of an ironless magnetic linear motor in a Y-Z plane in accordance with a second embodiment of the present invention; -
FIG. 12 illustrates a view of an application of superimposed commutation drive currents and commutation levitating currents to a forcer ofFIG. 11 in a X-Z plane in accordance with the present invention; -
FIGS. 13 and 14 illustrate views of an ironless magnetic linear motor in a Y-Z plane in accordance with a third embodiment of the present invention; -
FIG. 15 illustrates a view of an application of commutation transversal currents to a forcer ofFIGS. 13 and 14 in a X-Z plane in accordance with the present invention; -
FIG. 16 illustrates exemplary commutation transversal currents applied to a forcer ofFIG. 15 and an exemplary transversal force generated by the forcer in response to the commutation transversal currents in accordance with the present invention; -
FIG. 17 illustrates a view of an application of superimposed commutation drive currents and commutation transversal currents to the forcer ofFIG. 2 in a X-Z plane in accordance with the present invention; -
FIG. 18 illustrates exemplary phase shifting of commutation drive currents and commutation transversal currents as applied to the forcer ofFIG. 17 ; -
FIG. 19 illustrates a commutation current superimposition/phase shifting control system in accordance with a fourth embodiment of the present invention; -
FIG. 20 illustrates a first exemplary mechanical coupling of a pair of ironless magnetic linear motor of the present invention to an object; -
FIG. 21 illustrates a second exemplary mechanical coupling a pair of ironless magnetic linear motor of the present invention to an object; -
FIG. 22 illustrates a view of an ironless magnetic linear motor ofFIG. 21 in a X-Z plane; -
FIG. 23 illustrates a third exemplary mechanical coupling a pair of ironless magnetic linear motor of the present invention to an object; and -
FIG. 24 illustrates a view of a mechanical coupling of a pair of ironless magnetic linear motor ofFIG. 23 in a X-Z plane. - Referring to
FIG. 6 , an ironless magneticlinear motor 21 of the present invention employingmagnetic track 30 and forcer 40 withforcer 40 having a new and unique orientation within the linear air gap. Specifically,forcer 40 is disposed within the linear air gap along a center X-Z longitudinal plane CP of the linear air gap as best shown inFIG. 6 . As shown inFIG. 7 ,coil 41 offorcer 40 is represented by its flow path for a commutation levitating current IZ1,coil 42 is offorcer 40 is represented by its flow path for a commutation levitating current IZ2,coil 43 offorcer 40 is represented by its flow path for a commutation levitating current IZ3. - Opposing sets of drive turns of coils 41-43 orthogonal to the X drive axis and parallel to the Z levitation axis are internal to magnetic field β as best shown in
FIG. 7 . One set of levitating turns of coils 41-43 parallel to the X drive axis and orthogonal to the Z levitation axis from a bottom perspective ofFIG. 7 is external to magnetic field β, while the opposing set of levitating turns of coils 41-43 parallel to the X drive axis and orthogonal to the Z levitation axis from a top perspective ofFIG. 7 is internal to magnetic field β. As a result, an application of a 120° phase shift PS1 of commutation levitating currents IZ1, IZ2 and IZ3 to coils 41-43, respectively, generates a levitating force FZ parallel to the Z levitating axis as best shown inFIG. 8 . - The present invention provides for a phase shifting of a superimposition of commutation levitating currents IZ1, IZ2 and IZ3 on commutation drive currents IX1, IX2 and IX3, respectively, to facilitate a maximum decoupling, if not a complete decoupling, of drive force FX (
FIG. 5 ) and levitating force FZ (FIG. 8 ). Specifically, as shown inFIG. 9 ,coil 41 offorcer 40 is represented by its flow path for a superimposition of commutation levitating current IZ1 on commutation drive coil IX1,coil 42 offorcer 40 is represented by its flow path for a superimposition of commutation levitating current IZ2 on commutation drive coil IX2, andcoil 43 offorcer 40 is represented by its flow path for a superimposition of commutation levitating current IZ3 on commutation drive coil IX3. As shown inFIG. 10 , commutation levitating current IZ1 is phase shifted from commutation drive coil IX1 by a 90° phase shift PS2, commutation levitating current IZ2 is phase shifted from commutation drive coil IX2 by 90° phase shift PS2, and commutation levitating current IZ3 is phase shifted from commutation drive coil IX3 by 90° phase shift PS2. - Referring to
FIG. 11 , an ironless magneticlinear motor 22 of the present invention employingmagnetic track 30 andforcer 40 withforcer 40 having a opposite orientation within the linear air gap as compared to theforcer 40 orientation of the linear air gap of motor 21 (FIG. 6 ). Specifically, opposing sets of drive turns of coils 41-43 orthogonal to the X drive axis and parallel to the Z levitation axis are internal to magnetic field β as best shown inFIG. 12 . One set of levitating turns of coils 41-43 parallel to the X drive axis and orthogonal to the Z levitation axis from a top perspective ofFIG. 12 is external to magnetic field β, while the opposing set of levitating turns of coils 41-43 parallel to the X drive axis and orthogonal to the Z levitation axis from a bottom perspective of FIG. 12 is internal to magnetic field β. As a result, an application of a 120° phase shift PS1 of commutation levitating currents IZ1, IZ2 and IZ3 to coils 41-43, respectively, generates a levitating force FZ parallel to the Z levitating axis as best shown inFIG. 8 . - The present invention provides for a phase shifting of a superimposition of commutation levitating currents IZ1, IZ2 and IZ3 on commutation drive currents IX1, IX2 and IX3, respectively, to facilitate a minimal decoupling, if not a complete decoupling, of drive force FX (
FIG. 5 ) and levitating force FZ (FIG. 8 ). Specifically, as shown inFIG. 12 ,coil 41 offorcer 40 is represented by its flow path for a superimposition of commutation levitating current IZ1 on commutation drive coil IX1,coil 42 offorcer 40 is represented by its flow path for a superimposition of commutation levitating current IZ2 on commutation drive coil IX2, andcoil 43 offorcer 40 is represented by its flow path for a superimposition of commutation levitating current IZ3 on commutation drive coil IX3. As shown inFIG. 10 , commutation levitating current IZ1 is phase shifted from commutation drive coil IX1 by a 90° phase shift PS2, commutation levitating current IZ2 is phase shifted from commutation drive coil IX2 by 90° phase shift PS2, and commutation levitating current IZ3 is phase shifted from commutation drive coil IX3 by 90° phase shift PS2. - Referring to
FIGS. 13-15 , an ironless magneticlinear motor 23 of the present invention employingmagnetic track 30 andforcer 40 withforcer 40 having a new and unique orientation within the linear air gap. Specifically,forcer 40 is disposed within the linear air gap at an offset to center X-Z longitudinal plane CP of the linear air gap as best shown inFIGS. 13 and 14 . As shown inFIG. 15 ,coil 41 offorcer 40 is represented by its flow path for a commutation levitating current IY1,coil 42 is offorcer 40 is represented by its flow path for a commutation levitating current IY2,coil 43 offorcer 40 is represented by its flow path for a commutation levitating current IY3. - Opposing sets of drive turns of coils 41-43 orthogonal to the X drive axis and parallel to the Z levitation axis are internal to magnetic field β as best shown in
FIG. 15 . Opposing sets of levitating turns of coils 41-43 parallel to the X drive axis and orthogonal to the Z levitation axis are external to magnetic field β as best shown inFIG. 15 . As a result, an application of a 120° phase shift PS1 of commutation transversal currents IY1, IY2 and IY3 to coils 41-43, respectively, generates a transversal force FY parallel to the Y transversal axis as best shown inFIG. 16 . - The present invention provides for a phase shifting of a superimposition of commutation transversal currents IY1, IY2 and IY3 on commutation drive currents IX1, IX2 and IX3, respectively, to facilitate a minimal decoupling, if not a complete decoupling, of drive force FX (
FIG. 5 ) and transversal force FY (FIG. 16 ). Specifically, as shown inFIG. 17 ,coil 41 offorcer 40 is represented by its flow path for a superimposition of commutation transversal current IY1 on commutation drive coil IX1,coil 42 offorcer 40 is represented by its flow path for a superimposition of commutation transversal current IY2 on commutation drive coil IX2, andcoil 43 offorcer 40 is represented by its flow path for a superimposition of commutation transversal current IY3 on commutation drive coil IX3. As shown inFIG. 18 , commutation transversal current IY1 is phase shifted from commutation drive coil IX1 by a 90° phase shift PS2, commutation transversal current IY2 is phase shifted from commutation drive coil IX2 by 90° phase shift PS2, and commutation transversal current YY3 is phase shifted from commutation drive coil IX3 by 90° phase shift PS2. - In practice, the present invention does not impose any limitations or any restrictions as a system for controlling a ironless magnetic linear motor of the present invention. In one embodiment as illustrated in
FIG. 19 , a commutation current superimposition/phase shiftingcontrol system 50 of the present invention employing M number offorcer position sensors 51, where M≧1, and a commutationcurrent generator 52. Sensor(s) 51 operate to measure the relative position (up to 360 spatial degrees) of coils of a forcer within the magnetic field generated by the linear arrays of magnets within the linear air gap of the magnetic track. In one embodiment, sensor(s) 51 are position transducers strategically positioned relative to the forcer to thereby provide signals FPS indicative of a position of coils of a forcer within the magnetic field in view of the structural configurations of the magnetic track and the force. In a second embodiment, sensor(s) 51 are magnetic flux sensors (e.g., Hall sensors) strategically positioned relative to the forcer within the magnetic field to thereby provide signals FPS indicative of a position of coils of a forcer within the magnetic field in view of the structural configurations of the magnetic track and the forcer. - Commutation
current generator 52 operates to provide a phase shifting of a N number of superimposition of commutation levitating currents IZ on respective commutation drive currents IX and/or a phase shifting of a N number of superimposition of commutation transversals currents IY on respective commutation drive currents IX as shown inFIG. 19 . This operation ofgenerator 52 is in accordance with new and unique superimposition/phase shifting commutation algorithm designed in view of the structural configurations and relative orientations of the magnetic track, the forcer andsensors 51. - Referring to
FIGS. 6-19 , those having ordinary skill in the art will appreciate numerous advantages of the present invention including, but not limited to, addressing the drawbacks of the background art previously described herein. Furthermore, those having ordinary skill in the art will appreciate how to apply the phase shifting/superimposition inventive principles of the present invention to ironless magnetic liner motors in addition to motors 21-23 shown inFIGS. 6 , 11, 13 and 14, respectively. In particular, those having ordinary skill in the art will appreciate how to apply the phase shifting/superimposition inventive principles of the present invention in the context of (1) the numerous variations in a structural configuration of a magnetic track, (2) the numerous variations in a structural configuration of a forcer, (3) the numerous variations in the orientation of a forcer in a linear air gap of a magnetic track in accordance with the present invention, (4) the numerous variations in a structural configuration of forcer position sensors, (5) the phase shifting range for commutation coil currents of the same type, (6) the phase shifting range for commutation coil currents of a dissimilar types and (7) the implementation of a positive slope and/or a negative slope for the commutation coil currents. The result is numerous variations of combinations of ironless magnetic linear motors in accordance with the inventive principles of the present invention, such as, for example, the utilization of one or more magnetic tracks to build a more degree of freedom (position and/or orientation) stage/manipulator as will now be exemplary described herein in the context ofFIGS. 20-24 . - Referring to
FIG. 20 , a pair of ironless magnetic linear motors 23 (FIGS. 13-15 ) are mechanically coupled in an eccentric to opposing sides of anobject 60 wherebymotors 23 can be operated to selectively moveobject 60 in an X drive direction of their respective linear air gaps and in a Y transversal direction of their respective linear air gaps. - Referring to
FIGS. 21 and 22 , a pair of ironless magneticlinear motors 24 are mechanically coupled in an eccentric to opposing sides of anobject 61. Eachmotor 24 includes a pair ofmagnetic tracks 30 mechanically coupled to align their respective linear air gaps as an integrated linear air gap. Eachmotor 24 further includes pair of outside forcers 40(O) within the integrated linear air gap to selectively generate a drive force FX, a levitation force FZ, a drive torque RX, a levitating torque RY and a transversal torque RZ. Eachmotor 24 further includes an internal forcer 40(I) within the integrated linear air gap to selectively generate a drive force FX, a transversal force FY, and levitating torque RZ. The result is a six (6) degree of freedom control ofobject 61 relative to a coordinate system ofobject 61 with a long stroke ofobject 61 along the X drive axis of the integrated linear air gaps ofmotors 24 and shorts strokes ofobject 61 along the Z levitating axes and the Y transversal axes of the integrated linear air gaps ofmotors 24. - Referring to
FIGS. 23 and 24 , a pair of ironless magneticlinear motors 25 of the present invention are mechanically coupled in an eccentric to opposing sides of anobject 62 with eachmotor 25 having an ironless magneticlinear motor 26 of the present invention being mechanically coupled thereto. Eachmotor 25 andmotor 26 includes a pair ofmagnetic tracks 30 mechanically coupled to align their respective linear air gaps as a an integrated linear air gap. Eachmotor 25 further includes pair offorces 40 within the integrated linear air gap to selectively generate a drive force FX, a levitation force FZ, a drive torque RX, a levitating torque RY and a transversal torque RZ. Eachmotor 26 further includes asingle forcer 40 within the integrated linear air gap to selectively generate a drive force FX, and a transversal force FY. The result is a six (6) degree of freedom control ofobject 62 relative to a coordinate system ofobject 62 with a long stroke ofobject 62 along the X drive axis of the integrated linear air gaps ofmotors 24 and shorts strokes ofobject 62 along the Z levitating axes and the Y transversal axes of the integrated linear air gaps ofmotors 24. - While the embodiments of the invention disclosed herein are presently considered to be preferred, various changes and modifications can be made without departing from the spirit and scope of the invention. The scope of the invention is indicated in the appended claims, and all changes that come within the meaning and range of equivalents are intended to be embraced therein.
Claims (24)
1. An ironless magnetic motor, comprising:
a magnetic track generating a magnetic field (β) across a linear air gap having a X drive axis, a Y transversal axis and a Z levitation axis, the X, Y and Z axis being mutually orthogonal; and
a forcer including a coil disposed within the linear air gap, the forcer being positioned in an X-Z plane, and
wherein a first set of levitating turns of the coil parallel to the X drive axis and orthogonal to the Z levitation axis is internal to magnetic field (β),
wherein a second set of levitating turns of the coil parallel to the X drive axis and orthogonal to the Z levitation axis is external to magnetic field (β),
wherein an opposing set of drive turns of the coil orthogonal to the X drive axis and parallel to the Z levitation axis is substantially internal to magnetic field (β),
wherein a commutation drive current (IX) is applied to the coil to generate a drive force (FX) parallel to the X drive axis and orthogonal to the Z levitation axis, and
wherein a commutation levitating current (IZ) is superimposed on and phase shifted from the commutation drive current (IX) to generate a levitating force (FZ) orthogonal to the X drive axis and parallel to the Z levitation axis.
2. The ironless magnetic motor of claim 1 , wherein the phase shifting of commutation levitating current (IZ) from the commutation drive current (IX) is such that the levitating force (FZ) is at least substantially decoupled from the drive force (FX).
3. The ironless magnetic motor of claim 1 , wherein the phase shifting of commutation levitating current (IZ) from the commutation drive current (IX) is 90 degrees.
4. The ironless magnetic motor of claim 1 , wherein the forcer is centered on a center X-Z longitudinal plane (CP) of the linear air gap.
5. The ironless magnetic motor of claim 1 , wherein the first set of levitating turns of the coil is a top set of levitating turns of the coil.
6. The ironless magnetic motor of claim 1 , wherein the second set of levitating turns of the coil is a top set of levitating turns of the coil.
7. An ironless magnetic motor, comprising:
a magnetic track generating a magnetic field (β) across a linear air gap having a X drive axis, a Y transversal axis and a Z levitation axis, the X, Y and Z axis being mutually orthogonal; and
a forcer including a coil disposed within the linear air gap, the forcer being positioned in an X-Z plane, and
wherein the forcer is offset from a center X-Z longitudinal plane (CP) of the linear air gap,
wherein a commutation drive current (IX) is applied to the coil to generate a drive force (FX) parallel to the X drive axis and orthogonal to the Y transversal axis, and
wherein a commutation transversal current (IY), which is superimposed on and phase shifted from the commutation drive current (IX), is applied to the coil to generate a transversal force (FY) orthogonal to the X drive axis and parallel to the Y transversal axis.
8. The ironless magnetic motor of claim 7 , wherein the phase shifting of commutation transversal current (IY) from the commutation drive current (IX) is such that the transversal force (FY) is at least substantially decoupled from the drive force (FX).
9. The ironless magnetic motor of claim 7 , wherein the phase shifting of commutation transversal current (IY) from the commutation drive current (IX) is 90 degrees.
10. The ironless magnetic motor of claim 7 , wherein a first set of levitating turns of the coil parallel to the X drive axis and orthogonal to the Z levitation axis is external to magnetic field (β).
11. The ironless magnetic motor of claim 10 , wherein a second set of levitating turns of the coil parallel to the X drive axis and orthogonal to the Z levitation axis is external to magnetic field (β).
12. An ironless magnetic motor, comprising:
a magnetic track generating a magnetic field (β) across a linear air gap having an X drive axis, a Y transversal axis and a Z levitation axis, the X, Y and Z axis being mutually orthogonal; and
a forcer including a coil disposed within the linear air gap, and
wherein the forcer is offset from a center X-Z longitudinal plane (CP) of the linear air gap,
wherein a commutation drive current (IX) is applied to the coil to generate a drive force (FX) parallel to the X drive axis and orthogonal to the Y transversal axis, and
wherein a commutation transversal current (IY) is superimposed on and phase shifted from the commutation drive current (IX) to generate a transversal force (FY) orthogonal to the X drive axis and parallel to the Y transversal axis.
13. The ironless magnetic motor of claim 12 , wherein the transversal force (FY) is at least substantially decoupled from the drive force (FX).
14. The ironless magnetic motor of claim 12 , wherein the phase shifting of commutation transversal current (IY) from the commutation drive current (IX) is 90 degrees.
15. The ironless magnetic motor of claim 12 , wherein a first set of levitating turns of the coil parallel to the X drive axis and orthogonal to the Z levitation axis is external to the magnetic field (β).
16. The ironless magnetic motor of claim 15 , wherein a second set of levitating turns of the coil parallel to the X drive axis and orthogonal to the Z levitation axis is external to magnetic field (β).
17. An ironless magnetic motor, comprising:
a magnetic track generating a magnetic field (β) across a linear air gap having an X drive axis, a Y transversal axis and a Z levitation axis, the X, Y and Z axis being mutually orthogonal; and
a forcer including a coil disposed within the linear air gap, and
wherein a commutation drive current (IX) is applied to the coil to generate a drive force (FY) parallel to the X drive axis, and
wherein the forcer is orientated within the linear air gap to generate a force (FZ, FY) orthogonal to the X drive axis in response to a commutation coil current (IZ, IY) being superimposed on and phase shifted from the commutation drive current (IX).
18. The ironless magnetic motor of claim 17 , wherein the force (FZ, FY) is a levitating force (FZ) that is at least substantially decoupled from the drive force (FX).
19. The ironless magnetic motor of claim 17 , wherein the force (FZ, FY) is a transversal force (FY) that is at least substantially decoupled from the drive force (FX).
20. The ironless magnetic motor of claim 17 , wherein the phase shifting of commutation coil current (IZ, IY) from the commutation drive current (IX) is 90 degrees.
21. The ironless magnetic motor of claim 17 , wherein a set of levitating turns of the coil parallel to the X drive axis and orthogonal to the Z levitation axis is external to magnetic field (β).
22. The ironless magnetic motor of claim 17 , wherein a set of levitating turns of the coil parallel to the X drive axis and orthogonal to the Z levitation axis is internal to magnetic field (β).
23. The ironless magnetic motor of claim 17 , wherein the forcer is centered on a center X-Z longitudinal plane (CP) of the linear air gap.
24. The ironless magnetic motor of claim 17 , wherein the forcer is offset from a center X-Z longitudinal plane (CP) of the linear air gap.
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US14/323,449 US20140312717A1 (en) | 2005-08-29 | 2014-07-03 | Ironless magnetic linear motors having levitating and transversal force capacities |
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PCT/IB2006/052772 WO2007026270A1 (en) | 2005-08-29 | 2006-08-10 | Ironless magnetic linear motors having levitating and transversal force capacities |
US6496708A | 2008-02-27 | 2008-02-27 | |
US14/323,449 US20140312717A1 (en) | 2005-08-29 | 2014-07-03 | Ironless magnetic linear motors having levitating and transversal force capacities |
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US12/064,967 Continuation US8803372B2 (en) | 2005-08-29 | 2006-08-10 | Ironless magnetic linear motors having levitating and transversal force capacities |
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EP (1) | EP1927180B1 (en) |
JP (1) | JP5329222B2 (en) |
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- 2006-08-10 EP EP06795630.0A patent/EP1927180B1/en active Active
- 2006-08-10 US US12/064,967 patent/US8803372B2/en active Active
- 2006-08-10 CN CN2006800315503A patent/CN101253673B/en active Active
- 2006-08-10 WO PCT/IB2006/052772 patent/WO2007026270A1/en active Application Filing
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2008
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10411527B2 (en) * | 2014-12-25 | 2019-09-10 | Thk Co., Ltd. | Linear motor |
US20180048195A1 (en) * | 2016-08-10 | 2018-02-15 | Chin-Hsing Feng | Electric motor |
Also Published As
Publication number | Publication date |
---|---|
KR20080046642A (en) | 2008-05-27 |
JP5329222B2 (en) | 2013-10-30 |
EP1927180B1 (en) | 2015-11-04 |
CN101253673B (en) | 2011-08-31 |
WO2007026270A1 (en) | 2007-03-08 |
US8803372B2 (en) | 2014-08-12 |
US20080246348A1 (en) | 2008-10-09 |
JP2009506747A (en) | 2009-02-12 |
CN101253673A (en) | 2008-08-27 |
EP1927180A1 (en) | 2008-06-04 |
KR101270048B1 (en) | 2013-05-31 |
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