CN86107217A - Displacement control device with the driving of constant temperature linear electric motors - Google Patents
Displacement control device with the driving of constant temperature linear electric motors Download PDFInfo
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- CN86107217A CN86107217A CN 86107217 CN86107217A CN86107217A CN 86107217 A CN86107217 A CN 86107217A CN 86107217 CN86107217 CN 86107217 CN 86107217 A CN86107217 A CN 86107217A CN 86107217 A CN86107217 A CN 86107217A
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Abstract
The present invention is the adjustable speed straight-line displacement control device of a kind of usefulness with thermostatically controlled linear electric motors driving, it is characterized in that thermostatically-controlled equipment is housed in linear electric motors, and the feedback that tests the speed, position detection control, electromagnetic braking location.Wherein linear electric motors can be the multipole DC linear electric motors of brushless, also can be the combined straight-line motors that direct current and micro-stepping are advanced, and the stator of its linear electric motors, but the also guideway of double as lathe of rotor realizes not having the magnetic pad guide rail of machinery contact.It provides a scheme for the straight-line motion mechanism that solves super-precision machine tools.
Description
The invention belongs to linear electric motors and drag automatic control technology.
Existing straight-line displacement control device is except that hydraulic drive, and major part is to utilize to place the motor-driven screw mandrel, moves thereby drive machine tool dragging plate; Just the Digit Control Machine Tool of new development is in recent years also controlled feeding by servo (rotation) motor-driven ball screw; This mechanism analyzes from performance: on the one hand owing to by the screw mandrel transmission, be subjected to certain placing restrictions on the raising precision; On the other hand according to the Theory of Automatic Control analysis, when being unified into closed-loop control system with the linear position detecting element, though pass through feedback compensation, improved the static immobilization precision of lathe greatly, but owing to comprised machine tool dragging plate in the system, the mechanical transmissioning piece that some dynamic response time constants such as screw mandrel are bigger makes the dynamic response variation, and has increased the complexity of system being carried out the stability correction.
Especially to the current science and techniques of defence, the electronic instrument industrial expansion is relevant Ultraprecision Machining directly, and above-mentioned mechanical transmission mechanism makes its development be subjected to certain restriction.The exploitation ultra-precision machine tool its essence is the kinematic accuracy that improves lathe, and wherein improving precision of rectilinear motion is an important techniques.
The present invention is from the electromechanical integration design philosophy, has taken all factors into consideration the straight-line feed relevant with precision of rectilinear motion and has driven control, microfeed, fine positioning, temperature Control Thermal Deformation, online detection, every technology such as error compensation.Adopt the current external linear electric motors of just developing to drive, and structurally drive requirement, done some following improvement for satisfying machine tool guideway at active development.Thereby saved mechanical organs such as drive lead screw, frame for movement is simplified greatly, main is to help further improving the straight-line displacement precision, improves dynamic response characteristic, for the straight-line motion mechanism that solves super-precision machine tools provides a scheme.
At first consider linear electric motors at the beginning of, secondary windings, in carrying out the electromagnetic energy transfer process, will produce heat, this will directly influence the thermal deformation of machine tool guideway, the present invention has increased a kind of thermostatically-controlled equipment in linear electric motors for this reason, wherein one of method is deciding at linear electric motors, rotor is embedded in the evaporation tube of freon refrigeration machine, (can certainly with semiconductor refrigerating element or other cooling module) utilizes the heat conduction of evaporation tube to lower the temperature, and detector unit is installed nearby by feedback, to reach the thermostatic control of certain limit, fundamentally eliminated the thermal deformation of machine tool guideway.
Secondly for satisfying the requirement of lathe to velocity of displacement, to obtain governor control characteristics preferably, this device increases by one group of winding that tests the speed in the DC linear electric motor preferably again in the low-speed characteristic that is adopted, according to the negative-feedback control of testing the speed of the relation of the output voltage of the winding that tests the speed and velocity of displacement, to obtain governor control characteristics preferably.
Be precisely controlling displacement quantity once more, parallel installation one linear position detecting element on machine tool guideway.Consider to have adopted at present more grating, inductosyn, these three kinds of linear position detecting elements of magnetic grid, because back two kinds are all utilized electromagnetic induction principle to detect, for preventing that electromagnetic induction on the linear electric motors is to its interference, it is more suitable to consider to adopt the grating that utilizes photoelectricity transformation principle to make the linear position detecting element, feed back by position probing and to control displacement, back cut-out armature winding electric current puts in place, making the thrust that is produced is zero, and utilize the magnetic force of Exciting Windings for Transverse Differential Protection generation that rotor is braked rapidly simultaneously, to reach accurate location.
In order to satisfy needed certain displacement amount of machine tooling and runnability, the DC linear electric motor that is adopted should be a multipolar dynamo, originally needed to increase brush commutates for this reason, but the present invention is owing to be equipped with position detecting element, detection signal in the time of just can be according to the pole span of design of electrical motor and displacement compares, come the sense of current of control break armature winding, so no longer need brush-commutatedly, promptly simplify the structure and reduced because some problems of brush-commutated existence.
In order further to be suitable for the requirement of super-precision machine tools, another scheme of the invention process is that its linear electric motors adopt direct current to add micro-stepping to advance the combined straight-line motor, promptly when utilizing above-mentioned multipole brushless DC linear electric motor to drive, add a little feeding linear stepping motor again.This little feeding linear stepping motor can utilize the magnetostriction principle of piezoelectric ceramics to make, its step pitch can design as requested between 5～0.01 microns, utilize that direct current generator carries out soon, feeding control at a slow speed, utilize micro-stepping motors to carry out microfeed, to satisfy the requirement of ultraprecise processing.Also must further improve the resolution ratio and the precision of position detecting element for this reason, based on existing grating detection component owing to reasons such as manufacturing process, under the situation of the incisure density of failing to improve the Grating glass ruler, can further segment by electronic circuit and improve resolution ratio, adopt the software point compensation to improve precision simultaneously, promptly after whole device installs, again by more higher leveled position-measurement device, as laser interferometer, after measuring relatively, utilize the software control of microcomputer, in the EPROM memory, set multiple spot, carry out point compensation and improve accuracy of detection.
This invention has been because the linear electric motors driving has been adopted in the displacement between guide rail in addition, thereby just can realize between the guideway not having the magnetic pad guide rail of machinery contact, fundamentally eliminated owing to the unevenness between guide rail etc., transmission brought bad phenomenon such as vibration.Accompanying drawing is one of its embodiment, promptly utilize the rotor double as guideway of linear electric motors, for guaranteeing the balance between magnetic cushion steam crack, imagination is installed a gap measuring element between air gap, according to detection signal control both sides Exciting Windings for Transverse Differential Protection electric current, to change the attraction (or repulsive force) of both sides stator to rotor, promptly the suspending power of magnetic pad guide rail is aligned magnetic cushion steam crack spacing.Certain moving direction according to guide rail, suffered gravity of planker and the direction that adds suffered cutting force in man-hour, the shape of its guideway also should be different, and the design of the linear motor stator electric of double as generation magnetic pad buoyancy and location layout etc. also need be taken all factors into consideration.
Description of drawings:
(1) is detector unit in the accompanying drawings, (2) be the air gap clearance detecting element, (3) be planker, (4) be the slide rule of position detecting element, (5) are the scale of position detecting element, and (6) are linear motor rotor, (7) be linear motor stator electric, (8) be the evaporation tube of refrigeration machine, (9) are air gap, and (10) are bed piece.
Claims (6)
1, a kind of adjustable speed straight-line displacement control device that drives with linear electric motors is characterized in that having thermostatically-controlled equipment in the linear electric motors, and has the feedback of testing the speed, position detection control, electromagnetic braking location.
2, the straight-line displacement control device of stipulating as claim item 1, it is characterized in that said thermostatically-controlled equipment is to adopt the rotor that cooling module is embedded linear electric motors, near the stator, comes cooling motor and guide rail, and detector unit is housed, carry out thermostatic control by feedback.
3,, it is characterized in that said linear electric motors are a kind ofly to have the winding that tests the speed simultaneously, and utilize the multipole brushless DC linear electric motor of position detection signal control commutation as the straight-line displacement control device of claim item 1 or 2 regulations.
4, straight-line displacement control device as claim item 1 or 2 regulations, it is characterized in that said linear electric motors are combined straight-line motors that a kind of direct current of being combined by DC linear electric motor and little feeding linear stepping motor and micro-stepping are advanced, utilize DC linear electric motor to carry out soon feeding at a slow speed, utilize little feeding linear stepping motor to carry out microfeed, wherein little feeding linear stepping motor can be to utilize the magnetostriction principle of piezoelectric ceramics to make, and wherein DC linear electric motor is to have the multipole brushless DC linear electric motor that tests the speed winding and utilize position detection signal control to commutate simultaneously.
5, as the straight-line displacement control device of claim item 1 to 4 any regulation, it is characterized in that moving guide rail wherein is a kind of stator that utilizes linear electric motors, the magnetic pad guide rail of rotor double as guideway, and gap measuring element is housed, between air gap by feeding back the air gap that the exciting current of controlling linear electric motors obtains balance.
6, as the straight-line displacement control device of claim item 1 to 5 any regulation, it is characterized in that by the detected displacement signal of position detecting element, must further segment by electronic circuit, to improve resolution ratio, utilize the software control of microcomputer simultaneously, set multiple spot and carry out point compensation, to improve accuracy of detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86107217 CN86107217A (en) | 1986-10-16 | 1986-10-16 | Displacement control device with the driving of constant temperature linear electric motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86107217 CN86107217A (en) | 1986-10-16 | 1986-10-16 | Displacement control device with the driving of constant temperature linear electric motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86107217A true CN86107217A (en) | 1987-06-10 |
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ID=4803519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86107217 Pending CN86107217A (en) | 1986-10-16 | 1986-10-16 | Displacement control device with the driving of constant temperature linear electric motors |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86107217A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101075129B (en) * | 2006-05-16 | 2011-06-29 | 浙江捷昌线性驱动科技股份有限公司 | Intelligent driven controlling system |
| CN103465102A (en) * | 2013-09-16 | 2013-12-25 | 苏州凯欧机械科技有限公司 | Cooling device for linear motor machine tool guide rail |
-
1986
- 1986-10-16 CN CN 86107217 patent/CN86107217A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101075129B (en) * | 2006-05-16 | 2011-06-29 | 浙江捷昌线性驱动科技股份有限公司 | Intelligent driven controlling system |
| CN103465102A (en) * | 2013-09-16 | 2013-12-25 | 苏州凯欧机械科技有限公司 | Cooling device for linear motor machine tool guide rail |
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| C06 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |