CN101276051A - Bidirectional linear accurate force actuator - Google Patents

Bidirectional linear accurate force actuator Download PDF

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Publication number
CN101276051A
CN101276051A CNA2008100247738A CN200810024773A CN101276051A CN 101276051 A CN101276051 A CN 101276051A CN A2008100247738 A CNA2008100247738 A CN A2008100247738A CN 200810024773 A CN200810024773 A CN 200810024773A CN 101276051 A CN101276051 A CN 101276051A
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CN
China
Prior art keywords
spring
force actuator
force
ball screw
bidirectional linear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2008100247738A
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Chinese (zh)
Inventor
姚正秋
王跃飞
李国平
周放
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Institute of Astronomical Optics and Technology NIAOT of CAS
Original Assignee
Nanjing Institute of Astronomical Optics and Technology NIAOT of CAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by Nanjing Institute of Astronomical Optics and Technology NIAOT of CAS filed Critical Nanjing Institute of Astronomical Optics and Technology NIAOT of CAS
Priority to CNA2008100247738A priority Critical patent/CN101276051A/en
Publication of CN101276051A publication Critical patent/CN101276051A/en
Pending legal-status Critical Current

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Abstract

A bidirectional linear accurate force actuator is composed of a stepping motor and a spring. The invention is characterized in that the stepping motor and a ball screw are permanently connected. The ball screw is connected with the mirror surface through the spring. At the same time a force measuring element is provided between the spring and the mirror surface. The output of the force measuring element is connected to a control circuit of the stepping motor. The spring of the optimized plan is a composite spring assembly. The stepping motor is fixed through a fixing mechanism and is connected with the ball screw which can move radically. The ball screw adopts an accurate guide screw. The invention overcomes a nonlinear problem that the acting force of the force actuator are in two directions in prior art. The bidirectional linear accurate force actuator of the invention can exert compressive force or stretching force to the mirror surface and at the same time guarantee the high-precision linearity of bidirectional function of the force actuator.

Description

Bidirectional linear accurate force actuator
Technical field
The present invention relates to the electromechanical component on a kind of optical instrument, be specifically related to a kind of bidirectional linear accurate force actuator.
Background technology
Force actuator is in the active optics technology of modern development, applies accurate power to optical element, controlling its face shape, thereby forms portion's external member of high-quality optical image.Traditional force actuator can only unidirectionally be exerted pressure, and when exerting pressure in the other direction, because the effect in gap, power is just controlled inaccurate.As the force actuator of European Southern Observatory, structure as shown in Figure 1, it is to contact with minute surface by a spring, can only use pressure spring, and minute surface is exerted pressure.When the mirror distortion needed pulling force, this force actuator just can not use.
For addressing this problem, develop a kind of pneumatic type force actuator in the prior art, as shown in Figure 2, its structure is that force actuator is connected with a corrugated tube by screw mandrel, is connected with minute surface by S-hook again.Motor can drive screw mandrel and corrugated tube is exerted pressure or pulling force to minute surface; But when driven by motor screw mandrel tension and compression corrugated tube, the bellows interior air produces pressure, and according to equation of gaseous state, P*V=C, and V=A*L so the power P of the displacement L of Electric Machine Control and generation is non-linear, like this, has increased the control difficulty and reduced precision.
Summary of the invention
At the nonlinear problem of force actuator acting force on both direction that exists in the prior art, the present invention will provide a kind of bidirectional linear accurate force actuator, the bidirectional force actuator of this new construction can be exerted pressure or pulling force to minute surface, can guarantee the high-precision linearity of force actuator beidirectional simultaneously.
The scheme of finishing the foregoing invention task is: a kind of bidirectional linear accurate force actuator, form by stepper motor and spring, it is characterized in that, stepper motor is fixedlyed connected with ball screw, ball screw by spring be connected with minute surface, simultaneously also be provided with load-sensing unit (for example, force transducer) between spring and minute surface, the output of this load-sensing unit connects the Stepping Motor Control circuit.
Force actuator general in the prior art is by computer control, so " output of load-sensing unit connects the Stepping Motor Control circuit " described in the such scheme can be the CPU that the output of load-sensing unit directly connects computing machine.
Above scheme is further optimized, and scheme more specifically following and that more optimize is arranged:
1, described spring is the complex spring combination;
2, described stepper motor is to fix by fixed mechanism, and is connected with the ball screw that can move radially.
3, described ball screw adopts accurate screw mandrel.
Stepper motor becomes accurate translation by its corner of the accurate control of computing machine by accurate screw mandrel, promotes complex spring, converts elastic force to and puts on the minute surface.The power size that applies after testing, if error is arranged, is compensated by the computer-controlled stepper motor rotation, to reach very high precision.
The effect of described complex spring combination is with two compression combinations that stage clip is suitable.Push-pull effort acts in the middle of two stage clips.Like this, when no matter force actuator draws or press, two springs all are under the compressive state works, the non-linear phenomena when having avoided with single spring zero crossing.Guaranteed that like this force actuator can two-way function, high-precision linearity has been arranged again.
The present invention has overcome the nonlinear problem of force actuator acting force on both direction that exists in the prior art, bidirectional linear accurate force actuator of the present invention can be exerted pressure or pulling force to minute surface, can guarantee the high-precision linearity of force actuator beidirectional simultaneously.
Description of drawings
Fig. 1 is traditional unidirectional force actuator structural representation;
Fig. 2 is the two-way non-linear force actuator of a present invention structural representation;
Fig. 3 is the bidirectional linear accurate force actuator structural representation of embodiment 1;
Fig. 4 is a complex spring unitized construction synoptic diagram.
Embodiment
Embodiment 1, and with reference to Fig. 3: bidirectional linear accurate force actuator, stepper motor 1 be by fixed mechanism 3 fixing (stepper motor 1 also can be fixing by thrust bearing and fixed mechanism 3 thereof), and is connected with the accurate screw mandrel 2 that can move radially.Accurate screw mandrel 2 is connected with load-sensing unit 5 by complex spring combination 4, and load-sensing unit 5 is connected with minute surface 6, and the output of while load-sensing unit 5 connects the computing machine of stepper motor 1 control circuit.
Stepper motor becomes accurate translation by its corner of the accurate control of computing machine by accurate screw mandrel, promotes complex spring, converts elastic force to, puts on the minute surface.The power size that applies, detect and with desirable value relatively, if error is arranged, rotate by computer-controlled stepper motor and to be compensated, to reach very high precision.
The effect of complex spring combination is with two compression combinations that stage clip is suitable.In the middle of two stage clips of push-pull effort effect.Like this, when no matter force actuator draws or press, two springs all are under the compressive state works, and has guaranteed that like this force actuator can two-way function, and high-precision linearity is arranged again.Its structure is with reference to Fig. 4: about two compression springs 7,8 be contained in the tubular spring case 9, the nut sleeve 10 by spring case one end makes up two compression springs.When nut rotates, promptly drive the spring case move left and right, its amount of movement provides the stack numerical value of making a concerted effort to become of two springs, and by pull bar 11 outputs.

Claims (4)

1, a kind of bidirectional linear accurate force actuator, form by stepper motor and spring, it is characterized in that, stepper motor is fixedlyed connected with ball screw, ball screw by spring be connected with minute surface, simultaneously also be provided with load-sensing unit between spring and minute surface, the output of this load-sensing unit connects the Stepping Motor Control circuit.
2, according to the described bidirectional linear accurate force actuator of claim 1, it is characterized in that: described spring is the complex spring combination.
3, according to claim 1 or 2 described bidirectional linear accurate force actuators, it is characterized in that: described stepper motor is to fix by fixed mechanism, and is connected with the ball screw that can move radially.
4, according to the described bidirectional linear accurate force actuator of claim 3, it is characterized in that: described ball screw adopts accurate screw mandrel.
CNA2008100247738A 2008-05-06 2008-05-06 Bidirectional linear accurate force actuator Pending CN101276051A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2008100247738A CN101276051A (en) 2008-05-06 2008-05-06 Bidirectional linear accurate force actuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2008100247738A CN101276051A (en) 2008-05-06 2008-05-06 Bidirectional linear accurate force actuator

Publications (1)

Publication Number Publication Date
CN101276051A true CN101276051A (en) 2008-10-01

Family

ID=39995645

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2008100247738A Pending CN101276051A (en) 2008-05-06 2008-05-06 Bidirectional linear accurate force actuator

Country Status (1)

Country Link
CN (1) CN101276051A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105650182A (en) * 2014-11-27 2016-06-08 罗伯特·博世有限公司 Linear actuator
CN107943123A (en) * 2017-11-02 2018-04-20 中国科学院长春光学精密机械与物理研究所 The control system and control method of a kind of force actuator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105650182A (en) * 2014-11-27 2016-06-08 罗伯特·博世有限公司 Linear actuator
CN105650182B (en) * 2014-11-27 2019-09-10 罗伯特·博世有限公司 Linear actuator
CN107943123A (en) * 2017-11-02 2018-04-20 中国科学院长春光学精密机械与物理研究所 The control system and control method of a kind of force actuator

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Open date: 20081001