CN102476311A - Magnetic suspension feeding platform for numerical control machine tool - Google Patents
Magnetic suspension feeding platform for numerical control machine tool Download PDFInfo
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- CN102476311A CN102476311A CN2010105535014A CN201010553501A CN102476311A CN 102476311 A CN102476311 A CN 102476311A CN 2010105535014 A CN2010105535014 A CN 2010105535014A CN 201010553501 A CN201010553501 A CN 201010553501A CN 102476311 A CN102476311 A CN 102476311A
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Abstract
The invention discloses a magnetic suspension feeding platform for a numerical control machine tool. The magnetic suspension feeding platform comprises a feeding platform and a long stator linear synchronous motor, wherein the long stator linear synchronous motor mainly comprises a stator core and a mover core which can move relative to the stator core. The magnetic suspension feeding platform is characterized in that: the feeding platform is arranged on the mover core; an exciting winding is arranged in the mover core; a thrust winding is arranged in the stator core; the feeding platform is provided with an eddy current sensor; the stator core is provided with a long grating sensor; the exciting winding and the eddy current sensor are connected to a magnetic suspension control system; and the thrust winding and the long grating sensor are connected to a feeding control system. In the invention, the feeding platform is suspended by using normal magnetic tensile force of the electrically-excited linear synchronous motor to eliminate friction, which plays an important role in further increasing the processing accuracy of the feeding platform for the numerical control machine tool.
Description
Technical field
The present invention relates to a kind of feeding platform, particularly relate to a kind of no friction of Digit Control Machine Tool, Digit Control Machine Tool magnetic suspension feeding platform of direct feeding of being used for, belong to fields of numeric control technique.
Background technology
The frictional resistance that the Digit Control Machine Tool feeding platform produces in process, particularly the non-linear friction when low speed influences the precision of feed system inevitably, causes feed system to produce creeping and causes reverse dead band.Friction is to cause one of numerical control machine heat deformation reason, is the key factor that influences machining accuracy.Friction also causes wearing and tearing, produces noise
Factor needs good lubricating to improve the lathe life-span.Therefore, how effectively to reduce or eliminate the friction oneself become the technical bottleneck of condition number controlled machine feeding platform performance.
Existing Digit Control Machine Tool magnetic suspension feeding platform utilizes permanent-magnet linear motor; The linear motor that perhaps utilizes other type is as driving element, and the electromagnet of additional multi-point support suspends, and device is complicated; The ability that particularly lacks the direct self-suspending of feeding platform; When machine body designs, have to consider the suspension problem, limited using and promoting of magnetic suspension feeding platform, influence the stability and the reliability of magnetic suspension feeding platform operation.
Summary of the invention
Goal of the invention: the present invention provides a kind of Digit Control Machine Tool magnetic suspension feeding platform; Its objective is that solution Digit Control Machine Tool magnetic suspension feeding platform in the past relies on the electromagnet multi-point support to suspend; Complex structure, stability and poor reliability particularly can't well solve the technical problem of frictional resistance.
Technical scheme: the present invention realizes through following technical scheme:
A kind of Digit Control Machine Tool magnetic suspension feeding platform; It is characterized in that: said feeding platform comprises feeding platform and long stator linear synchronous motor, when said long stator linear synchronous motor mainly comprises stator core and uses and the mover core that relatively moves of stator core; Said feeding platform is installed on the mover core; In said mover core, be provided with the Exciting Windings for Transverse Differential Protection that mover core is suspended in stator core, in said stator core, be provided with and promote the thrust winding that mover core moves with respect to stator core; Said feeding platform is provided with current vortex sensor; Said stator core is provided with long grating sensor; Said Exciting Windings for Transverse Differential Protection and current vortex sensor are connected to magnetic suspension control system; Said thrust winding is connected to feed control system with long grating sensor.
Said magnetic suspension control system comprises DC PWM converter, proportional controller and current PI adjuster; Said current vortex sensor is connected to proportional controller; Proportional controller is connected to the current PI adjuster; The current PI adjuster is connected to the DC PWM converter, and the DC PWM converter is connected to Exciting Windings for Transverse Differential Protection; Said feed control system comprises SPWM converter, position
Proportional controller, speed pi regulator, current PI adjuster and can produce the inverter of thrust; Said long grating sensor is connected to the position proportional adjuster; The position proportional adjuster is connected to the speed pi regulator; The speed pi regulator is connected to the current PI adjuster in the feed control system; This current PI adjuster is connected to the SPWM converter, and the SPWM converter is connected to the inverter that can produce thrust, and the inverter that can produce push current is connected with thrust winding.
Said stator core is arranged on the pedestal bottom, also is provided with auxiliary guide rail on pedestal top.
The magnetic pole of long stator linear synchronous motor is an excitation pole, also is the suspension magnetic pole simultaneously.
Advantage and effect: the present invention provides a kind of Digit Control Machine Tool magnetic suspension feeding platform; Comprise feeding platform and long stator linear synchronous motor; Said long stator linear synchronous motor mainly comprises stator core and the mover core that can do relative motion with stator core, and it is characterized in that: said feeding platform is fixedly connected with mover core; In said mover core, be provided with Exciting Windings for Transverse Differential Protection, in said stator core, be provided with thrust winding; Said feeding platform is provided with current vortex sensor; Said stator core is provided with long grating sensor; Said Exciting Windings for Transverse Differential Protection and current vortex sensor are connected to magnetic suspension control system; Said thrust winding is connected to feed control system with long grating sensor.
In order to solve the problem of Digit Control Machine Tool feeding platform existence in the past; The present invention realizes the feeding and the magnetic suspension of feeding platform by same linear synchronized motor simultaneously; That is to say linear synchronized motor and feeding platform are combined; Feeding platform is directly installed on the mover of long stator linear synchronous motor, the feed motion of feeding platform is to be realized by the tangential electromagnetic push of linear synchronized motor, changes electromagnetic push through the electric current of regulating thrust winding; Magnetic suspension force is the unilateral magnetic force that produces between the stator core of excitation pole and linear synchronized motor on the mover core, regulates magnetic suspension force through regulating exciting current.The magnetic pole of long stator linear synchronous motor is an excitation pole, also is the suspension magnetic pole simultaneously.The electromagnet magnetic suspension system that this is different from the past; This invention is that the magnetic suspension force that leans on motor self to produce moves; Feeding platform has the ability of direct self-suspending, and can overcoming in the past, feeding platform electromagnet multi-point support suspends, the device complicacy makes it influence operation stability and technology of dependability problem.
In addition, this invention also comprises following technical characterictic: the thrust winding electric current of long stator linear synchronous motor is that whole device provides electromagnetic push, and adopts i.One 0 vector control mode.
The size of exciting current is accomplished by magnetic suspension control system, and the main circuit of system is a direct current PwM converter, adopts the two closed-loop controls of hoverheight and exciting current.The hoverheight controller is a proportional controller, and preventing hoverheight overshoot, and exciting current adopts pi regulator.
The feeding process of platform is accomplished by feed control system, and this is the three ring control systems that a position, speed and electric current are formed.Position ring is a proportional controller, and speed and electric current adopt pi regulator.
Because the magnetic line of force is always closed along the minimum path of magnetic resistance; Feeding platform directly links to each other with the mover core of long stator linear synchronous motor; Under the magnetic pull effect, feeding platform and mover core can not be equivalent to guiding electromagnet of the prior art to the side deflection.The effect of magnetic pull is far longer than electromagnetic push, therefore, is equivalent to that there are a plurality of guiding electromagnets both sides on the direction of motion of motor.
The concrete advantage of the present invention is following:
The feeding of l, feeding platform and magnetic suspension are accomplished by same linear synchronized motor simultaneously, need not the electromagnet multi-point support and suspend, and platform structure is simple, reliability is high.
2, feeding platform mover direct and linear synchronized motor is fixedly linked, and the guide rail of feeding platform also is the auxiliary guide rail of linear synchronized motor simultaneously.
3, compare with the feeding platform of forming by pure permanent magnet linear synchronous motor in the past, overcome the shortcoming that air-gap field is difficult to regulate.
4, the feeding platform of forming with permanent magnetism in the past and electric excitation composite excitation linear synchronized motor relatively has the simple characteristics that realize easily of magnetic structure.
5, the feeding platform of this invention is not for there being the direct feeding of friction; And there is not frictional resistance between the guide rail; Improve the precision and the response speed of feed system, eliminated and creeped and reverse dead band, thermal deformation, wearing and tearing, noise and exempt to lubricate, improved the lathe life-span.
This invention adopts the normal direction magnetic pull of the linear synchronized motor of electric excitation that feeding platform is suspended to eliminate friction; Make the Digit Control Machine Tool feeding platform when directly driving, can fundamentally eliminate friction and realize no friction feed, and independent motor and the electromagnet established in addition need not resembling in the past; Thoroughly whole device is simplified, and improved operating efficiency greatly, significant to the machining accuracy of further raising Digit Control Machine Tool feeding platform.
Description of drawings
Figure l is a Digit Control Machine Tool magnetic suspension feeding platform structural representation of the present invention;
Fig. 2 is this invention platform control system theory diagram;
Label declaration is following among the figure: l, feeding platform; 2, mover core; : 3, Exciting Windings for Transverse Differential Protection; 4, stator core melon thrust winding .6, auxiliary guide rail; 7, current vortex sensor .8, long grating sensor; 9, feed control system; 10, magnetic suspension control system; 11, pedestal.
The tool specific embodiment
Below in conjunction with accompanying drawing the present invention is done further explanation:
Digit Control Machine Tool magnetic suspension feeding platform; Comprise feeding platform l and long stator linear synchronous motor; When said long stator linear synchronous motor mainly comprises stator core 4 and uses and the mover core 2 that relatively moves of stator core 4, said feeding platform l is installed on the mover core 2; In said mover core 2, be provided with Exciting Windings for Transverse Differential Protection 3, Exciting Windings for Transverse Differential Protection 3 can be so that produce magnetic suspension between mover core 2 and the stator core 4; In said stator core 4, be provided with thrust winding 5, thrust winding 5 can be so that mover core 2 relatively moves with respect to stator core 4.As scheme shown in the l, the wiring direction of Exciting Windings for Transverse Differential Protection 3 and thrust winding 5 is vertical along the moving direction of stator core 4 with mover core 2.Said feeding platform l is provided with current vortex sensor 7; Said stator core 4 is provided with long grating sensor 8; Said Exciting Windings for Transverse Differential Protection 3 is connected to magnetic suspension control system 10 with current vortex sensor 7; Said thrust winding 5 is connected to feed control system 9 with long grating sensor 8.
As shown in Figure 2, said magnetic suspension control system 10 comprises PwM converter, proportional controller and current PI adjuster; Said current vortex sensor 7 is connected to proportional controller, and proportional controller is connected to the current PI adjuster, and the current PI adjuster is connected to the PwM converter, and the PwM converter is connected to Exciting Windings for Transverse Differential Protection 3; Exciting Windings for Transverse Differential Protection 3 links to each other with direct current PwM converter, in air gap, produces magnetic field, and its size is decided by hoverheight.With given hoverheight and the current vortex sensor 7 detected feedbacks formation error signal of highly comparing; This error signal passing ratio adjuster computing obtains the specified rate of exciting current; Produce the control signal of direct current PwM converter through the current PI adjuster; Through changing the size that duty is recently regulated exciting current, air-gap field is regulated, thus the size of change magnetic pull; Form the automatic regulating system of a hoverheight; Feeding platform l is in suspended state when the equal and opposite in direction of the gross weight of feeding platform l, mover core 2 and the load of feeding platform l institute and magnetic pull, and this process is accomplished by magnetic suspension control system 10, to guarantee that hoverheight is constant when the load disturbance.
Said feed control system 9 comprises sPwM converter, position proportional adjuster, speed pi regulator, current PI adjuster and can produce the inverter of thrust; Said sPwM converter is exactly the sine wave pulse width modulated converter; Said long grating sensor 8 is connected to the position proportional adjuster, and the position proportional adjuster is connected to the speed pi regulator, and speed PI transfers
The joint device is connected to the current PI adjuster in the feed control system 9, and this current PI adjuster is connected to the sPwM converter, and the sPwM converter is connected to the inverter that can produce thrust, and the inverter that can produce thrust is connected with thrust winding 5.
After feeding three-phase symmetrical sine electric current in the thrust winding 5 in stator core 4, in air gap, produce travelling-magnetic-field.The excitation field that travelling-magnetic-field and the Exciting Windings for Transverse Differential Protection on mover core 23 produce interacts and produces electromagnetic push.
The feeding process of feeding platform l is accomplished by feed control system 9, and this is the three ring control systems that a position, speed and electric current are formed.With the amount of feeding formation position error signal of comparing with long grating sensor 8 detected feedback quantities; This error signal obtains the specified rate of feed speed through the computing of position proportional adjuster; It with relatively form the feed speed error signal by isolated feedback speed signal in the long grating sensor 8 detected position signallings; This error signal is through forming the specified rate of electric current after the computing of speed pi regulator; The formation current error signal of comparing with the feedback quantity of electric current again, this error signal obtains producing the control signal of the inverter of thrust through the computing of current PI adjuster, through the thrust winding electric current is adopted i.One 0 vector control mode, the regulating action of the system that accomplishes.Therefore, feed control system 9 also is a positional servosystem in essence.
Said stator core 4 is arranged on pedestal 11 bottoms, also is provided with auxiliary guide rail 6 on pedestal 11 tops.When magnetic suspension feeding platform l does not work, be parked on the auxiliary guide rail 6 on the pedestal 11, said mover core 2 moves along auxiliary guide rail 6 when working exactly.Auxiliary guide rail 6 is the guide rail of feeding platform, also is the guide rail of linear synchronized motor simultaneously, not be used in and establishes guide rail on the long stator linear synchronous motor in addition, when saving material, has improved operating efficiency.
The platform feeding of this invention and magnetic suspension are realized by same director's linear stator synchronous motor simultaneously; Feeding platform is directly installed on the mover of long stator linear synchronous motor; The feed motion of feeding platform is to be realized by the tangential electromagnetic push of linear synchronized motor, changes electromagnetic push through the electric current of regulating thrust winding; Magnetic suspension force is the unilateral magnetic force that produces between the stator core of excitation pole and long stator linear synchronous motor on the mover core; Regulate magnetic suspension force through regulating exciting current; The magnetic suspension force that feeding platform relies on motor self to produce moves, and has the ability of direct self-suspending.
The magnetic pole of this long stator linear synchronous motor is an excitation pole, also is the suspension magnetic pole simultaneously.
Fig. 2 is the theory diagram of feed control system and magnetic suspension control system.
This invention adopts the normal direction magnetic pull of the long stator linear synchronous motor of electric excitation that feeding platform is suspended to eliminate friction; Make the Digit Control Machine Tool feeding platform when directly driving, can fundamentally eliminate friction and realize no friction feed; And need not establish motor and electromagnet separately in addition; Machining accuracy to further raising Digit Control Machine Tool feeding platform is significant, and simple for structure reasonable, relatively is beneficial at numerical control field and applies.
Claims (1)
1. Digit Control Machine Tool magnetic suspension feeding platform; It is characterized in that: said feeding platform comprises feeding platform and long stator linear synchronous motor, when said long stator linear synchronous motor mainly comprises stator core and uses and the mover core that relatively moves of stator core; Said feeding platform is installed on the mover core; In said mover core, be provided with the Exciting Windings for Transverse Differential Protection that mover core is suspended in stator core, in said stator core, be provided with and promote the thrust winding that mover core moves with respect to stator core; Said feeding platform is provided with current vortex sensor; Said stator core is provided with long grating sensor; Said Exciting Windings for Transverse Differential Protection and current vortex sensor are connected to magnetic suspension control system; Said thrust winding is connected to feed control system with long grating sensor; Said magnetic suspension control system comprises DC PWM converter, proportional controller and current PI adjuster; Said current vortex sensor is connected to proportional controller; Proportional controller is connected to the current PI adjuster; The current PI adjuster is connected to the DC PWM converter, and direct current PwM converter is connected to Exciting Windings for Transverse Differential Protection; Said feed control system comprises SPWM converter, position proportional adjuster, speed pi regulator, current PI adjuster and can produce the inverter of thrust; Said long grating sensor is connected to the position proportional adjuster; The position proportional adjuster is connected to the speed pi regulator; The speed pi regulator is connected to the current PI adjuster in the feed control system; This current PI adjuster is connected to the SPWM converter, and the SPWM converter is connected to the inverter that can produce thrust, and the inverter that can produce push current is connected with thrust winding; Said stator core is arranged on the pedestal bottom, also is provided with auxiliary guide rail on pedestal top; The magnetic pole of long stator linear synchronous motor is an excitation pole, also is the suspension magnetic pole simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105535014A CN102476311A (en) | 2010-11-22 | 2010-11-22 | Magnetic suspension feeding platform for numerical control machine tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105535014A CN102476311A (en) | 2010-11-22 | 2010-11-22 | Magnetic suspension feeding platform for numerical control machine tool |
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| Publication Number | Publication Date |
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| CN102476311A true CN102476311A (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105535014A Pending CN102476311A (en) | 2010-11-22 | 2010-11-22 | Magnetic suspension feeding platform for numerical control machine tool |
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| CN (1) | CN102476311A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105500032A (en) * | 2016-01-06 | 2016-04-20 | 沈阳工业大学 | Magnetic levitation motion stage provided with controllable excitation linear synchronous motors and used for vertical machining center |
-
2010
- 2010-11-22 CN CN2010105535014A patent/CN102476311A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105500032A (en) * | 2016-01-06 | 2016-04-20 | 沈阳工业大学 | Magnetic levitation motion stage provided with controllable excitation linear synchronous motors and used for vertical machining center |
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Application publication date: 20120530 |