CN112069659A - Mathematical model construction method and device for controlling rotating speed of server fan - Google Patents
Mathematical model construction method and device for controlling rotating speed of server fan Download PDFInfo
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Abstract
The invention discloses a mathematical model construction method and a mathematical model construction device for controlling the rotating speed of a server fan, and relates to the technical field of server heat dissipation. The method comprises the following steps: based on a mathematical model of the direct current motor, firstly, speed and ripple wave filtering is carried out on the direct current motor, then amplitude limitation is carried out on the output of the filtered direct current motor, the output of the direct current motor after the amplitude limitation is divided into two paths to be fed back, one path is fed back to the input end of the direct current motor, the other path is fed back to the input end of the direct current motor to be subjected to summation and integration operation, and in addition, optimization processing is carried out on the obtained control system. By adopting the method, the fan can be well controlled, the heat dissipation capacity is increased on the premise of saving additional electronic devices, a high-quality heat dissipation processing mode is achieved with low cost, the heat dissipation performance is improved, and the running stability of the server is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of server heat dissipation, in particular to a mathematical model construction method and device for controlling the rotating speed of a server fan.
Background
The server is one kind of computer, provides services such as calculation, storage, data exchange and the like for internet users, and is an important component node in the internet era. The server has the working characteristics of high operation rate, long operation time, high data throughput and the like, and the hardware of the server mainly comprises a circuit board and mechanism devices, so that the server can emit a large amount of heat energy when in operation, and if the heat energy cannot be timely and effectively discharged, the service lives of the circuit board and electronic components and the robustness of the whole system can be seriously influenced.
For solving the heat dissipation problem of server, guarantee that the server can be in the reliable operation of high temperature environment, in the current design, the inside a plurality of small-size fans that can dispose usually of server, the rotation through the fan distributes out the inside heat energy of server, consequently, ensures that the reasonable rotational speed of fan is the key of guaranteeing effective heat dissipation. The traditional fan control scheme generally outputs PWM waves to a motor through a BMC to control the rotating speed, the control effect of the motor is that the feedback is carried out through a temperature sensor, and how to reasonably control the speed of the fan is achieved, so that the fan can well control the temperature, and a deep research and effective method is lacked.
Disclosure of Invention
The embodiment of the invention provides a mathematical model construction method and a mathematical model construction device for controlling the rotating speed of a server fan, so that the fan can better realize temperature control, the heat dissipation performance is improved, and the running stability of a server is improved.
In order to achieve the purpose, the invention discloses the following technical scheme:
in one aspect, the present invention provides a method for constructing a mathematical model for controlling a rotational speed of a server fan, the method comprising:
s1, filtering the speed and the ripple of the direct current motor based on the mathematical model of the direct current motor;
s2, limiting the amplitude of the output of the filtered direct current motor;
s3, dividing the output of the DC motor after amplitude limitation into two paths for feedback, wherein one path is fed back to the input end of the DC motor, and the other path is fed back to the input end of the DC motor for quadrature operation after summation and integration operation, so as to obtain the mathematical expression of the control system as follows:
wherein, UmIs the voltage value u after amplitude limiting of the DC motor3Indicating motor friction.
Further, the method further includes simplifying the control system in step S3, including the following steps:
carrying out input amplitude limiting on an initial stage of a direct current motor control system;
and (4) performing an integration action on the direct current motor control system after input amplitude limiting.
Further, the input amplitude limiting is performed at the initial stage of the dc motor control system, specifically using the following formula:
further, the integration function is performed on the dc motor control system after the input amplitude limiting, specifically using the following formula:
according to the method for constructing the mathematical model for controlling the rotating speed of the server fan, the direct current motor control system further comprises a transition stage to a stable state after the integration stage, and the transition stage specifically adopts the following formula;
in another aspect, the present invention provides an apparatus for constructing a mathematical model for controlling a rotational speed of a server fan, the apparatus including:
the filtering unit is used for filtering the speed and the ripple waves of the direct current motor based on a mathematical model of the direct current motor;
the amplitude limiting unit is used for limiting the amplitude of the filtered output of the direct current motor through the amplitude limiter;
and the feedback unit is used for feeding back the output of the direct current motor after amplitude limitation in two paths, wherein one path is fed back to the input end of the direct current motor, and the other path is fed back to the input end of the direct current motor for quadrature after summation and integration operation.
Further, the device also comprises a circuit simplifying unit which is used for optimizing the direct current motor control system.
Based on the above, further, the circuit simplifying unit includes:
the input amplitude limiting module is used for carrying out input amplitude limiting on the initial stage of the direct current motor control system;
the integral action module is used for carrying out integral action on the direct current motor control system after input amplitude limiting;
and the transition module is used for realizing the transition of the direct current motor control system to a stable state after the integration action stage.
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
the embodiment of the application provides a mathematical model construction method and device for controlling the rotating speed of a server fan, based on a mathematical model of a direct current motor, firstly, the direct current motor is subjected to speed and ripple wave filtering, then, the amplitude of the output of the filtered direct current motor is limited, the output of the direct current motor after the amplitude limitation is divided into two paths to be fed back, one path of the output is fed back to the input end of the direct current motor, the other path of the output is fed back to the input end of the direct current motor after summation and integration operation, and in addition, the obtained control system is subjected to optimization processing. The method and the device can realize good control on the fan, increase the heat dissipation capacity on the premise of saving additional electronic devices, thereby realizing a high-quality heat dissipation processing mode with low cost, improving the heat dissipation performance and increasing the running stability of the server.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic flowchart of a mathematical model construction method for controlling a rotational speed of a server fan according to an embodiment of the present disclosure;
fig. 2 is a diagram of a mathematical model of a conventional dc motor;
FIG. 3 is a structural diagram of a dynamic flexibility control system of the DC motor according to the present embodiment;
FIG. 4 is a block diagram of the control system of FIG. 3 after optimization;
FIG. 5 is a graph of simulated velocity response of the dynamic compliance control system;
FIG. 6 is a simulated velocity response diagram of the control system without the control algorithm of the present embodiment;
fig. 7 is a schematic structural diagram of a mathematical model construction apparatus for controlling a rotational speed of a server fan according to an embodiment of the present disclosure.
Reference numerals:
the device comprises a 1-filtering unit, a 2-amplitude limiting unit, a 3-feedback unit, a 4-circuit simplifying unit, a 41-input amplitude limiting module, a 42-integration action module and a 43-transition module.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a flowchart of a mathematical model construction method for controlling a rotational speed of a server fan according to an embodiment of the present invention.
Referring to fig. 1, the implementation steps of this embodiment are as follows:
s1, filtering the speed and the ripple of the direct current motor based on the mathematical model of the direct current motor;
s2, limiting the amplitude of the output of the filtered direct current motor;
and S3, dividing the output of the DC motor after amplitude limitation into two paths for feedback, wherein one path is fed back to the input end of the DC motor, and the other path is fed back to the input end of the DC motor for quadrature after summation and integration operation.
Specifically, referring to fig. 2, the above-described construction method is adopted to obtain a dynamic flexibility change structure diagram of the dc motor shown in fig. 3. Where DCM denotes the dc motor transfer function of fig. 2, via limiter UmThe amplitude of the direct current motor is limited in a range, and therefore damage to the motor is avoided. And then, the output of the direct current motor is divided into two paths for feedback, one path is directly fed back to the input end of the DCM, and on the other hand, the output of the direct current motor is fed back to the input end of the direct current motor for quadrature after a series of steps of summation and integration. In the context of figure 3 of the drawings,
for speed-measuring and filtering modules, UmThe value at which the limiter is supplied, i.e. the specified maximum voltage supplied to the motor, is mathematically represented by the control system of fig. 3 as follows:
wherein, UmIs the voltage value u after amplitude limiting of the DC motor3The friction force of the motor is shown, and the friction force integrates the position condition of the motor. P can be obtained by the formula, so that a closed-loop control is formed with the output end.
Specifically, in the system shown in fig. 3, in order to make the feedback element have higher gain characteristic, a larger parameter q, a constant parameter k, is usually selected1And k2Generally set k1≥k2. In addition, an integrating limiter UmShould be as large as possible so that better system performance can be achieved.
Next, based on the above control system, simplification processing is performed thereon.
Firstly, performing input amplitude limiting on an initial stage of a direct current motor control system, and specifically adopting the following formula:
the error of the system state is larger at the initial stage of the system transient state, and the q in the selection strategy is larger, so that the amplitude limiter can almost continuously adjust the variable feedback gain p to a large enough value so as to ensure that the direct current motor control system performs direct current operation within a limit range.
Next, performing an integration function on the dc motor control system after the input amplitude limiting specifically using the following formula:
due to k1≥k2Thus k is2/k1The results obtained are very small and, when reflected in actual control, make the simplified dynamic compliance controller function as an output integral controller.
Further, after the integral action stage of the direct current motor control system, the direct current motor control system also comprises a transition stage to a stable state, wherein the transition stage specifically adopts the following formula;
in the transition stage, the control system will run continuously, and finally the system stable state is achieved. After the above simplification of the dc motor dynamic flexibility control system, an optimized fan control system structure diagram as shown in fig. 3 is obtained. In the debugging of the direct current motor, the current loop in the last loop is set by the motor set, so the current of the control secondary loop is established in a speed control loop, wherein omega and I aremIs a saturated part, TlIs the load force to which the dc motor is subjected. In FIG. 4 is GθAs a position controller, GωThe speed controller and the controller respectively control the speed and the position of the direct current motor.
Based on the control system, simulation is carried out in the speed controller, and when the system has load sudden change within 0.09s, speed response graphs obtained by the dynamic flexible variable control system and the control system without the control algorithm are respectively shown in fig. 5 and fig. 6. Comparing fig. 5 and fig. 6, it can be seen that the speed response fluctuation is smaller and the performance is better after the algorithm of the dynamic flexible variable structure is added.
Fig. 7 is a schematic structural diagram of a mathematical model building apparatus for controlling a rotational speed of a server fan according to an embodiment of the present invention, including:
the filtering unit 1 is used for filtering the speed and ripple waves of the direct current motor based on a mathematical model of the direct current motor;
the amplitude limiting unit 2 is used for limiting the amplitude of the output of the filtered direct current motor through an amplitude limiter;
and the feedback unit 3 is used for feeding back the output of the direct current motor after amplitude limitation in two paths, wherein one path is fed back to the input end of the direct current motor, and the other path is fed back to the input end of the direct current motor for product calculation after summation and integration operation.
Further, the apparatus further comprises a circuit simplifying unit 4 for optimizing the dc motor control system.
Specifically, the circuit simplifying unit includes:
an input amplitude limiting module 41, configured to perform input amplitude limiting on an initial stage of the dc motor control system;
an integration module 42, configured to perform integration on the dc motor control system after input amplitude limiting;
and a transition module 43 for realizing the transition of the direct current motor control system to the stable state after the integration action stage.
The contents, which are not described in detail in the mathematical model construction apparatus for controlling the rotational speed of the server fan provided in the embodiment of the present application, may refer to the mathematical model construction method for controlling the rotational speed of the server fan provided in the above embodiment, and are not described herein again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that any modification, improvement and equivalent substitution made without departing from the principle of the present invention are included in the protection scope of the present invention.
Claims (8)
1. A mathematical model construction method for controlling the rotating speed of a server fan is characterized by comprising the following steps:
s1, filtering the speed and the ripple of the direct current motor based on the mathematical model of the direct current motor;
s2, limiting the amplitude of the output of the filtered direct current motor;
s3, dividing the output of the DC motor after amplitude limitation into two paths for feedback, wherein one path is fed back to the input end of the DC motor, and the other path is fed back to the input end of the DC motor for quadrature operation after summation and integration operation, so as to obtain the mathematical expression of the control system as follows:
wherein, UmIs the voltage value u after amplitude limiting of the DC motor3Indicating motor friction.
2. The method for constructing a mathematical model for controlling the fan speed of a server according to claim 1, further comprising simplifying the control system in step S3, comprising the following steps:
carrying out input amplitude limiting on an initial stage of a direct current motor control system;
and (4) performing an integration action on the direct current motor control system after input amplitude limiting.
3. The method according to claim 2, wherein the input amplitude limiting is performed at an initial stage of the dc motor control system, specifically using the following formula:
4. the method as claimed in claim 2, wherein the integration of the dc motor control system after input amplitude limiting is performed by using the following formula:
5. the method as claimed in claim 2, wherein the dc motor control system further includes a transition stage to a steady state after the integration stage, and the transition stage specifically adopts the following formula:
6. a mathematical model construction apparatus for controlling a rotational speed of a server fan, to which the mathematical model construction method for controlling a rotational speed of a server fan according to any one of claims 1 to 5 is applied, comprising:
the filtering unit is used for filtering the speed and the ripple waves of the direct current motor based on a mathematical model of the direct current motor;
the amplitude limiting unit is used for limiting the amplitude of the filtered output of the direct current motor through the amplitude limiter;
and the feedback unit is used for feeding back the output of the direct current motor after amplitude limitation in two paths, wherein one path is fed back to the input end of the direct current motor, and the other path is fed back to the input end of the direct current motor for quadrature after summation and integration operation.
7. The apparatus of claim 6, further comprising a circuit simplification unit for optimizing the DC motor control system.
8. The apparatus of claim 7, wherein the circuit simplification unit comprises:
the input amplitude limiting module is used for carrying out input amplitude limiting on the initial stage of the direct current motor control system;
the integral action module is used for carrying out integral action on the direct current motor control system after input amplitude limiting;
and the transition module is used for realizing the transition of the direct current motor control system to a stable state after the integration action stage.
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| CN111414057A (en) * | 2020-03-12 | 2020-07-14 | 苏州浪潮智能科技有限公司 | Fan rotating speed control method and system, electronic equipment and storage medium |
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| CN111414057A (en) * | 2020-03-12 | 2020-07-14 | 苏州浪潮智能科技有限公司 | Fan rotating speed control method and system, electronic equipment and storage medium |
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| 刘法志: "光刻机换台过程控制算法研究", 知网, pages 124 - 128 * |
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