CN212509039U - Hydraulic motor rotating speed closed-loop control system - Google Patents
Hydraulic motor rotating speed closed-loop control system Download PDFInfo
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- CN212509039U CN212509039U CN202020374222.0U CN202020374222U CN212509039U CN 212509039 U CN212509039 U CN 212509039U CN 202020374222 U CN202020374222 U CN 202020374222U CN 212509039 U CN212509039 U CN 212509039U
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Abstract
The utility model discloses a hydraulic motor rotational speed closed-loop control system, include: the display is used for inputting a rotating speed calibration program command; a rotation speed sensor for detecting a rotation speed of the hydraulic motor; and the controller is respectively connected with the display and the rotating speed sensor and is used for receiving a rotating speed calibration program command signal input by the display and the motor rotating speed input by the rotating speed sensor, and when the expected rotating speed of the hydraulic motor is changed, the controller controls the rotating speed of the hydraulic motor to reach the expected rotating speed through the electro-proportional valve. The utility model discloses a hydraulic motor rotational speed closed-loop control system, control accuracy is high, response speed is fast, can reduce the steady state time among the hydraulic motor rotational speed closed-loop control, and the result of use is outstanding.
Description
Technical Field
The utility model relates to a hydraulic motor rotational speed closed-loop control system belongs to hydraulic motor rotational speed control technical field.
Background
Hydraulic transmission technology has become an essential component in various industrial fields, such as the fields of machinery, electronics, steel, transportation vehicles and manufacturing, rubber, textile, chemical, food, packaging, printing, and tobacco. In advanced technological fields such as nuclear industry and aerospace, hydraulic transmission technology also occupies an important position. Among hydraulic system actuators, a constant-displacement motor is often used to control the rotational speed. The fixed displacement motor is a hydraulic motor with a constant theoretical output displacement per revolution. According to the formula n, Q is multiplied by 1000 × η/V, n is the motor speed, Q is the input flow of the motor, η is the volumetric efficiency of the motor, and V is the displacement of the motor. Since the volumetric efficiency of the motor and the displacement of the motor are determined by the characteristics of the motor itself, controlling the rotational speed of the motor is typically accomplished by controlling the input flow to the motor.
At present, the rotation speed of the motor reaches the expected rotation speed by adopting a closed loop control of Proportional Integral Derivative (PID). The controller outputs a Pulse Width Modulation (PWM) signal according to the change of the rotating speed of the motor, the Pulse Width Modulation (PWM) signal acts on the electric proportional valve to be represented as a current signal, the opening size of the electric proportional valve is controlled, the input flow of the motor is further controlled, and the aim of controlling the rotating speed of the motor by the controller is finally achieved. For example, when the desired rotational speed of the motor becomes greater relative to the current rotational speed, the value of the Pulse Width Modulation (PWM) signal becomes greater and the actual motor rotational speed increases. When the desired rotational speed of the motor is reduced relative to the current rotational speed, the value of a Pulse Width Modulation (PWM) signal is reduced and the actual rotational speed of the motor is reduced.
In the motor rotational speed closed-loop control, the time taken for the motor to stabilize from the current rotational speed to the desired rotational speed is referred to as the steady-state time in the motor rotational speed closed-loop control. If the desired speed of the motor is too high relative to the current speed, i.e., the motor suddenly increases from a low speed to a high speed, the controller outputs a Pulse Width Modulation (PWM) signal that increases in value. However, as the hydraulic system is slow in response, the motor speed cannot respond quickly, and the value of a Pulse Width Modulation (PWM) signal is increased to be large all the time, so that the system overshoots. The problems presented are motor speed oscillations and longer steady-state times.
Disclosure of Invention
To the problem that above-mentioned prior art exists, the utility model provides a hydraulic motor rotational speed closed-loop control system.
In order to achieve the above object, the utility model discloses a hydraulic motor rotational speed closed-loop control system, include:
the display is used for inputting a rotating speed calibration program command;
a rotation speed sensor for detecting a rotation speed of the hydraulic motor;
and the controller is respectively connected with the display and the rotating speed sensor and is used for receiving a rotating speed calibration program command signal input by the display and the motor rotating speed input by the rotating speed sensor, and when the expected rotating speed of the hydraulic motor is changed, the controller controls the rotating speed of the hydraulic motor to reach the expected rotating speed through the electro-proportional valve.
As an improvement, the controller receives a rotating speed calibration program command signal and then obtains the relation between the rotating speed and the current of the hydraulic motor.
As an improvement, when the expected rotation speed of the hydraulic motor is changed, the controller obtains a current value corresponding to the expected rotation speed according to the relation between the rotation speed of the hydraulic motor and the current.
As an improvement, the controller controls the rotating speed of the hydraulic motor to 90% of the expected rotating speed by constant current, and then uses the proportional-integral-derivative closed-loop control to enable the rotating speed of the hydraulic motor to reach the expected rotating speed according to the rotating speed of the hydraulic motor.
As an improvement, the rotating speed sensor adopts an encoder or a proximity switch.
Compared with the prior art, the utility model discloses a hydraulic motor rotational speed closed-loop control system, control accuracy is high, response speed is fast, can reduce the steady state time among the hydraulic motor rotational speed closed-loop control, and the result of use is outstanding.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a control flow chart of the present invention;
in the figure: 1. display, 2, controller, 3, rotational speed sensor, 4, electric proportional valve, 5, hydraulic motor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms used herein in the specification of the present invention are for the purpose of describing particular embodiments only and are not intended to limit the present invention.
As shown in fig. 1, a closed-loop control system for the rotation speed of a hydraulic motor comprises:
the display 1 is used for inputting a rotating speed calibration program command;
a rotational speed sensor 3 for detecting the rotational speed of the hydraulic motor 5;
and the controller 2 is respectively connected with the display 1 and the rotating speed sensor 3 and is used for receiving a rotating speed calibration program command signal input by the display 1 and the motor rotating speed input by the rotating speed sensor 3, and when the expected rotating speed of the hydraulic motor 5 is changed, the controller 2 controls the rotating speed of the hydraulic motor 5 to reach the expected rotating speed through the electro-proportional valve 4.
As an improvement, the controller 2 receives a rotation speed calibration program command signal, and then obtains the relationship between the rotation speed and the current of the hydraulic motor 5.
As a modification, when the desired rotation speed of the hydraulic motor 5 is changed, the controller 2 obtains a current value corresponding to the desired rotation speed according to the relationship between the rotation speed of the hydraulic motor 5 and the current.
As an improvement, the controller 2 controls the rotation speed of the hydraulic motor 5 to 90% of the desired rotation speed by constant current, and then controls the rotation speed of the hydraulic motor 5 to reach the desired rotation speed by using a closed loop control of proportional integral derivative according to the rotation speed of the hydraulic motor 5.
As a modification, the rotation speed sensor 3 employs an encoder or a proximity switch.
Example 1
As shown in fig. 2, the control method for reducing the steady-state time in the hydraulic motor rotating speed closed-loop control system comprises the following steps:
firstly, an operator enters a page of a rotating speed calibration program of the display 1 and clicks a calibration button;
step two, the controller 2 calls a rotation speed calibration subroutine to obtain the relation between the rotation speed and the current of the hydraulic motor 5;
step three, when the expected rotating speed of the hydraulic motor 5 is changed, the controller 2 obtains a current value corresponding to the expected rotating speed according to the relation between the rotating speed and the current in the step two;
step four, the controller 2 outputs a corresponding Pulse Width Modulation (PWM) signal according to the current value of the step three, and enters step five when the rotating speed of the hydraulic motor 5 is increased or reduced to 90% of the expected rotating speed;
and step five, the controller 2 collects the rotating speed of the hydraulic motor 5, and uses Proportional Integral Derivative (PID) closed-loop control to enable the rotating speed of the hydraulic motor to reach the expected rotating speed according to the rotating speed of the hydraulic motor 5.
The above description is only exemplary of the invention, and should not be taken as limiting the invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the invention should be included in the scope of the invention.
Claims (3)
1. A hydraulic motor speed closed loop control system, comprising:
the display is used for inputting a rotating speed calibration program command;
a rotation speed sensor for detecting a rotation speed of the hydraulic motor;
the controller is respectively connected with the display and the rotating speed sensor and is used for receiving a rotating speed calibration program command signal input by the display and the motor rotating speed input by the rotating speed sensor;
and when the expected rotating speed of the hydraulic motor is changed, the controller obtains a current value corresponding to the expected rotating speed according to the relation between the rotating speed of the hydraulic motor and the current.
2. The closed-loop control system for the rotating speed of the hydraulic motor as claimed in claim 1, wherein the controller controls the rotating speed of the hydraulic motor to 90% of the desired rotating speed by constant current, and then controls the rotating speed of the hydraulic motor to reach the desired rotating speed by proportional-integral-derivative closed-loop control according to the rotating speed of the hydraulic motor.
3. The closed-loop control system for the rotating speed of the hydraulic motor as claimed in claim 1, wherein the rotating speed sensor adopts an encoder or a proximity switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020374222.0U CN212509039U (en) | 2020-03-23 | 2020-03-23 | Hydraulic motor rotating speed closed-loop control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020374222.0U CN212509039U (en) | 2020-03-23 | 2020-03-23 | Hydraulic motor rotating speed closed-loop control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212509039U true CN212509039U (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020374222.0U Active CN212509039U (en) | 2020-03-23 | 2020-03-23 | Hydraulic motor rotating speed closed-loop control system |
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| Country | Link |
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| CN (1) | CN212509039U (en) |
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2020
- 2020-03-23 CN CN202020374222.0U patent/CN212509039U/en active Active
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