A photometer grating control mechanism based on a direct current motor plus an encoder and a driving method thereof

Abstract

The embodiment of the application provides a grating control mechanism and a driving method of a photometer based on a direct current motor and an encoder, and belongs to the technical field of photometers.The grating control mechanism of the photometer based on the direct current motor and the encoder comprises a grating seat, a direct current motor, an encoder, a shaft coupling, a screw rod support, a screw rod, a screw nut sliding block, a servo driver and a controller;the direct current motor is fixed on the screw rod support;the direct current motor drives the screw rod to rotate through the shaft coupling;the screw rod is matched with the screw nut sliding block to move;the controller, the direct current motor and the encoder are connected with the servo driver;the encoder is further connected with the controller, and the controller is used for reading a position signal fed back by the encoder;the screw nut sliding block is connected with the grating seat, and the screw rod is connected with the shaft coupling.The application can meet the need of rapid spectrum scanning, can effectively realize that the wavelength moving precision is 0.02 nm, and can improve the spectrum scanning speed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photometer technology, in particular to a photometer grating control mechanism based on a DC motor and an encoder and a driving method. BACKGROUND

[0002] In the existing photometer, the lead screw is driven by a stepper motor. However, the stepper motor has a low rotating speed, and the higher the rotating speed, the smaller the torque. In the case of fast wavelength movement, the lead screw may be locked, which limits the moving speed and precision of the slider in the grating control mechanism and makes it difficult to meet the need of fast spectrum scanning.

[0003] Therefore, how to overcome the above problems is a technical problem to be solved at present. SUMMARY

[0004] The present application aims to provide a photometer grating control mechanism based on a DC motor and an encoder and a driving method, which can improve the above problems.

[0005] The embodiments of the present application are implemented as follows:

[0006] In a first aspect, the present application provides a photometer grating control mechanism based on a DC motor and an encoder, which comprises a grating seat, a DC motor, an encoder, a shaft coupling, a lead screw support, a lead screw, a nut slider, a servo driver and a controller. The DC motor is fixed on the lead screw support, and the DC motor drives the lead screw to rotate through the shaft coupling. The lead screw and the nut slider move in cooperation, and the lead screw is connected with the shaft coupling. The controller, the DC motor and the encoder are connected with the servo driver. The encoder is also connected with the controller, and the controller is used for reading the position signal fed back by the encoder. The nut slider is connected with the grating seat.

[0007] In a possible embodiment, the DC motor is a DC brushless motor.

[0008] In a possible embodiment, the encoder is a 1000-line encoder.

[0009] In a possible embodiment, the encoder comprises an encoder signal line, which is fed back to the servo driver and also to the controller to form a double feedback control.

[0010] In a possible embodiment, the shaft coupling is a flexible shaft coupling.

[0011] In a possible embodiment, the pitch of the screw rod is 1 mm, wherein the wavelength movement of 20 nm corresponds to the movement of 1 mm of the nut slider, the nut slider needs to rotate the screw rod by 360 degrees to move 1 mm, the rotation of the screw rod by 360 degrees corresponds to 1000 pulse signals of the encoder, and one pulse signal corresponds to a wavelength movement accuracy of 0.02 nm.

[0012] In a possible embodiment, the model of the servo driver is ACS306.

[0013] In a possible embodiment, the model of the controller is STM32F103ZET6.

[0014] In a possible embodiment, the arm rod is arranged on the grating seat, the nut slider is connected with the arm rod, and the nut slider drives the grating to rotate through the arm rod.

[0015] In a possible embodiment, the model of the servo driver is ACS306.

[0016] The grating control mechanism and the driving method provided by the present application can adjust the movement speed and accuracy of the nut slider through the encoder, so as to meet the need of rapid spectrum scanning. In addition, the grating mechanism is driven by the DC motor combined with the encoder, so that the wavelength driving function can be realized, and greater torque and speed can be achieved, and higher position accuracy can be achieved. Furthermore, the wavelength movement accuracy of 0.02 nm can be effectively realized through the double feedback of the position signal of the encoder, and the spectrum scanning speed can be improved.

[0017] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of the drawings.

[0019] Figure 1 is a structural schematic diagram of a light meter grating control mechanism based on a direct current motor plus an encoder provided by the embodiments of the present application;

[0020] Figure 2 is Figure 1 a circuit structural schematic diagram of a light meter grating control mechanism based on a direct current motor plus an encoder;

[0021] Figure 3 is Figure 1 a structural schematic diagram of a grating seat in a light meter grating control mechanism based on a direct current motor plus an encoder;

[0022] Figure 4 is a flow schematic diagram of a driving method provided by another embodiment of the present application.

[0023] Reference signs:

[0024] 100 - a light meter grating control mechanism based on a direct current motor plus an encoder; 110 - a grating seat; 120 - a direct current motor; 130 - an encoder; 140 - a shaft coupling; 150 - a screw rod support; 160 - a screw rod; 170 - a screw nut slider; 180 - a servo driver; 190 - a controller; 111 - an arm rod; 113 - a fixing piece. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0026] Please refer to Figures 1 to 3The embodiment provides a grating control mechanism 100 of a photometer based on a direct current motor and an encoder, which comprises a grating seat 110, a direct current motor 120, an encoder 130, a shaft coupling 140, a screw rod support 150, a screw rod 160, a nut sliding block 170, a servo driver 180 and a controller 190.

[0027] The grating seat 110 is connected with the nut sliding block 170.

[0028] Optionally, the grating seat 110 is provided with an arm rod 111; one end of the arm rod 111 is fixedly connected with the nut sliding block 170, and the other end of the arm rod 111 is connected with the grating seat 110; and the nut sliding block 170 drives a grating (not shown in the figure) to rotate through the arm rod 111.

[0029] Optionally, the arm rod 111 is fixed on the grating seat 110 through a fixing piece 113.

[0030] Optionally, a sliding hole is arranged at the connection position of the arm rod 111 and the grating seat 110, so that the arm rod 111 can be driven to perform extension and contraction, thereby driving the grating seat 110 to move and further driving a grating (not shown in the figure) in the grating seat 110 to rotate.

[0031] That is, the nut sliding block 170 is driven to slide by the screw rod 140, and the grating is driven to rotate by the arm rod 111 through the sliding of the nut sliding block 170.

[0032] It should be understood that the grating can belong to the grating control mechanism 100 based on the direct current motor and the encoder, or belong to an external structure, that is, the grating control mechanism 100 based on the direct current motor and the encoder is used to drive the grating. Herein, no specific limitation is made.

[0033] The direct current motor 120 is fixed on the screw rod support 150, and the direct current motor 120 drives the screw rod 160 to rotate through the shaft coupling 140.

[0034] Optionally, the direct current motor 120 is a direct current brushless motor.

[0035] Optionally, the rated voltage of the direct current motor 120 is 24VDC, the rated rotating speed is 3000 revolutions per minute, and the rated torque is 0.125 newton meters; the power line of the direct current motor 120 comprises three wires of U, V and W; and the direct current motor 120 is connected to the servo driver 180 through the direct current motor power line.

[0036] Optionally, the direct current motor 120 is a high-speed direct current motor.

[0037] The encoder 130 is configured to feed back the position signal to the servo driver 180 and the controller 190 to form a double feedback control.

[0038] Optionally, the encoder 130 is a 1000 line encoder.

[0039] Optionally, the encoder 130 includes an encoder signal line including six wires of power supply VCC, ground GND, signal EA+, signal EA-, signal EB+, and signal EB-. The encoder 130 feeds back the position signal to the servo driver 180 and the controller 190 through the encoder signal line to form a double feedback control.

[0040] Optionally, the coupling 140 is a flexible coupling. The DC motor 120 is fixed on the screw rod support 150 to be connected with the screw rod 160 through the flexible coupling.

[0041] The screw rod 160 cooperates with the screw nut slider 170 to move (e.g., closely cooperate), that is, the screw nut slider 170 is installed on the screw rod 160 and can move (or slide) on the screw rod 160.

[0042] Optionally, the screw pitch of the screw rod 160 is 1 mm, the wavelength movement of the screw nut slider 170 corresponding to 1 mm movement is 20 nm, 1 mm movement of the screw nut slider 170 requires 360 degrees rotation of the screw rod 160, 360 degrees rotation of the screw rod 160 corresponds to 1000 pulse signals of the encoder 130, and the wavelength movement precision corresponding to one pulse signal is 0.02 nm.

[0043] Optionally, the screw rod 160 is a threaded screw rod.

[0044] Of course, in actual use, the screw rod 160 can also be a non-threaded screw rod, which is not specifically limited here.

[0045] Optionally, the servo driver is ACS306.

[0046] It should be understood that the above model is only an example and is not limited.

[0047] The controller 190, the DC motor 120, and the encoder 130 are connected with the servo driver 180. The encoder 130 is also connected with the controller 190, and the controller 190 is configured to read the position signal fed back by the encoder 130.

[0048] Optionally, the controller 190 can be an MCU (Microcontroller Unit).

[0049] Optionally, the model of the controller 190 is STM32F103ZET6.

[0050] Optionally, the controller 190 includes four groups of signals, i.e., a rotation direction control line, a rotation step control line, an enable control line, and a working state detection line.

[0051] As an implementation manner, the controller 190 includes a control port and a detection port, the detection port is connected with the encoder 130, and the control port is connected with the servo driver 180.

[0052] Optionally, the control port includes a rotation direction control, a rotation step control, an enable control, and a working state detection.

[0053] In the implementation process, the photometer grating control mechanism 100 based on a direct current motor and an encoder provided by the embodiment can adjust the moving speed and precision of the nut sliding block 170 through the encoder 130 to meet the need of rapid spectrum scanning, by arranging the grating seat 110, the direct current motor 120, the encoder 130, the shaft coupling 140, the screw rod support 150, the screw rod 160, the nut sliding block 170, the servo driver 180, and the controller 190. Secondly, the wavelength driving function can be realized by using the direct current motor 120 combined with the encoder 130 to drive the grating mechanism, so that greater torque and rotating speed can be realized, and higher position precision is also achieved. Further, the wavelength moving precision can be effectively realized as 0.02 nm through the double feedback of the position signal of the encoder 130. Further, the spectrum scanning speed can be improved. Further, the high-precision instrument demand is met, and the product performance is improved by using the high-speed direct current motor 120 and the double feedback control mode of the encoder 130.

[0054] Please refer to Figure 4 The embodiment of the application further provides a driving method, which is used for driving the photometer grating control mechanism 100 based on a direct current motor and an encoder as described above, and the driving method includes the following steps.

[0055] In step S201, the controller sends a pulse signal and a rotation direction signal to the servo driver.

[0056] As an implementation manner, the controller sends a pulse signal and a rotation direction signal to the servo driver through a rotation direction control line, a rotation step control line, an enable control line, and a working state detection line.

[0057] In step S202, the servo driver controls the direct current motor to drive the screw rod to rotate according to the pulse signal and the rotation direction signal.

[0058] As an implementation, the servo driver, after receiving the pulse signal and the steering signal, analyzes the pulse signal and the steering signal, and controls the DC motor to drive the screw rod to rotate through three power lines U, V and W.

[0059] In step S203, the encoder feeds back a position signal to the servo driver and the controller when the screw rod rotates.

[0060] It should be understood that the position signal is an encoded signal.

[0061] As an implementation, the encoder encodes the position signal into signals EA+, EA-, EB+ and EB-, and sends the encoded position signal to the servo driver and the controller based on the signals EA+, EA-, EB+ and EB- to form a double feedback control.

[0062] In step S204, the controller decodes the position signal to obtain the position information of the nut slider, so as to control the grating to rotate according to the position information.

[0063] In summary, the present application provides a grating control mechanism and driving method of a spectrometer based on a DC motor and an encoder. The grating seat 110, the DC motor 120, the encoder 130, the shaft coupling 140, the screw rod support 150, the screw rod 160, the nut slider 170, the servo driver 180 and the controller 190 are arranged, so that the movement speed and precision of the nut slider 170 are adjusted by the encoder 130 to meet the needs of rapid spectrum scanning. Secondly, the grating mechanism is driven by the DC motor 120 combined with the encoder 130, so that the wavelength driving function can be realized, the greater torque and speed can be realized, and the higher position precision is also achieved. Further, the wavelength movement precision of 0.02 nm can be effectively realized by the double feedback of the position signal of the encoder 130. Further, the spectrum scanning speed can be improved.

[0064] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "arrange", "mount", "connect", "join" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0065] It should be noted that like reference numerals and characters refer to like elements throughout the following figures and the following description, and that, unless otherwise indicated, like elements in two or more figures are not necessarily drawn to scale.

[0066] In the description of the application, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer" and the like refer to the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product of the application is usually placed, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. The above description is only the preferred embodiment of the application and is not intended to limit the application. For those skilled in the art, the application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A photometer grating control mechanism based on a DC motor and encoder, characterized in that, include: grating mount, DC motor, encoder, coupling, lead screw support, lead screw, lead screw nut slider, servo driver and controller; The DC motor is fixed on the lead screw bracket, and the DC motor drives the lead screw to rotate through the coupling; The lead screw moves in conjunction with the lead screw nut slider, and the lead screw is connected to the coupling; The controller, the DC motor, and the encoder are all connected to the servo driver; The encoder is also connected to the controller, which is used to read the position signal fed back by the encoder. The nut slider is connected to the grating seat; the grating seat is provided with an arm; the arm is connected to the nut slider; the arm is fixed to the grating seat by a fixing member; a sliding hole is provided at the connection between the arm and the grating seat to facilitate the extension and retraction of the arm, thereby driving the grating seat and the grating inside the grating seat to rotate; The nut slider drives the grating to rotate via the arm, and the grating is located outside the main axis; the encoder includes encoder signal lines, which feed back to the servo driver and the controller to form dual feedback control; The controller is used to send pulse signals and steering signals to the servo driver; The servo driver is used to control the DC motor to drive the lead screw to rotate according to the pulse signal and the steering signal; The encoder is used to feed back a position signal to the servo driver and the controller when the lead screw rotates; the controller decodes the position signal to obtain the position information of the lead screw slider, so as to control the rotation of the grating according to the position information; the encoder is a 1000-line encoder; the lead screw pitch is 1 mm, wherein a 1 mm movement of the lead screw slider corresponds to a 20 nm wavelength movement of the grating, a 1 mm movement of the lead screw slider requires a 360-degree rotation of the lead screw, a 360-degree rotation of the lead screw corresponds to 1000 pulse signals from the encoder, and the wavelength movement accuracy corresponding to one pulse signal is 0.02 nm; by using a DC motor combined with an encoder to drive the grating mechanism, the wavelength driving function is realized, which achieves higher torque and speed while also having higher position accuracy.

2. The photometer grating control mechanism based on a DC motor and encoder according to claim 1, characterized in that, The DC motor is a brushless DC motor.

3. The photometer grating control mechanism based on a DC motor and encoder according to claim 1, characterized in that, The coupling is a flexible coupling.

4. The photometer grating control mechanism based on a DC motor and encoder according to claim 1, characterized in that, The servo driver model is ACS306.

5. The photometer grating control mechanism based on a DC motor and encoder according to claim 1, characterized in that, The controller model is STM32F103ZET6.

6. The photometer grating control mechanism based on a DC motor and encoder according to claim 1, characterized in that, The grating mount is equipped with an arm; The arm is connected to the nut slider; The grating is rotated by the arm of the nut slider.

7. A driving method, characterized in that, The driving method is used to drive the photometer grating control mechanism based on a DC motor and encoder as described in any one of claims 1-6. The driving method includes: The controller sends pulse signals and steering signals to the servo driver; The servo driver controls the DC motor to drive the lead screw to rotate according to the pulse signal and the steering signal; The encoder feeds back a position signal to the servo driver and the controller when the lead screw rotates; The controller decodes the position signal to obtain the position information of the nut slider, so as to control the rotation of the grating according to the position information.

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