CN111490707A - Multi-mode electronic torque load meter - Google Patents
Multi-mode electronic torque load meter Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/38—Self-excitation by current derived from rectification of both output voltage and output current of generator
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Abstract
The invention discloses a multi-mode electronic torque load meter, comprising: the Hall sensor is used for measuring the voltage of the armature port of the generator and the current of the armature of the generator and feeding back the voltage and the current to the microprocessor through the signal conditioning circuit; the man-machine interaction panel is used for selecting a load mode and setting operation parameters required by load calculation modules corresponding to different load modes; the microprocessor is used for calling the corresponding load calculation module according to the selected different load modes; the load calculation module is used for calling induction parameters and/or operation parameters and/or fixed parameters required by the load calculation module; and the load calculation module is used for executing corresponding load calculation modules to obtain the duty ratio of a signal sent by a PWM driving chip for driving and controlling the direct current chopper so as to regulate the current of a load loop of the generator. The defect of single load working characteristic is overcome, the automatic load intensity adjusting and real-time displaying functions are achieved, and the set generator torque characteristic is achieved.
Description
Technical Field
The invention relates to the field of electrical engineering, in particular to a multi-mode electronic torque load meter.
Background
In the existing electric motor experimental device, a motor unit (motor-direct current generator) working mode is widely adopted, a direct current generator is used as a torque load adjusting device of a prime motor, and the generated voltage of the direct current generator (hereinafter referred to as generator) in a separately excited working mode is synchronously changed along with the rotating speed, so that three defects exist: 1) the load mechanical characteristics of the linear energy consumption linear motor exhibit a slope function rule, namely, the linear energy consumption load characteristics, other common types of torque loads such as a constant torque reaction load, a constant mechanical power load, a ventilator load and the like cannot be provided for experiments, and the development effect of motor teaching experiments is severely restricted; 2) the traditional generator load torque adjustment is manually operated through an external adjustable resistor, so that the real-time performance and the accuracy are poor; 3) the load torque cannot be directly read, and only the armature current of the motor can be manually converted. At present, electronic loads of various types on the market are limited to the application field of electrical circuits to realize automatic control and adjustment of load current, voltage, electric power or impedance, and no automatic adjusting device related to mechanical torque loads of motors is provided.
Disclosure of Invention
In view of the above problems, the present invention provides a multi-mode electronic torque load meter, which aims to solve the defect of single load operation characteristic of the existing dc generator load, and provides an electronic torque load meter with multiple selectable load modes, and has a function of automatically adjusting load intensity.
The invention is realized by the following technical scheme:
a multi-mode electronic torque load meter comprises a Hall sensor for detecting induction parameters obtained by a generator load loop, a direct current chopper for adjusting the current of the generator load loop, a microprocessor and a human-computer interaction panel;
the Hall sensor is used for measuring the voltage of the armature port of the generator and the current of the armature of the generator and feeding back the voltage and the current to the microprocessor through the signal conditioning circuit;
the man-machine interaction panel is used for selecting a load mode, setting operation parameters required by load calculation modules corresponding to different load modes, and displaying the load working parameters of the generator in real time during operation;
the microprocessor is used for calling the corresponding load calculation module according to the selected different load modes; the load calculation module is used for calling induction parameters and/or operation parameters and/or fixed parameters required by the load calculation module; the load calculation module is used for executing the corresponding load calculation module to obtain the duty ratio of a signal sent by a PWM driving chip used for driving and controlling the direct current chopper;
and the direct current chopper is connected with the output end of the microprocessor through a PWM driving chip and is used for acquiring the duty ratio of a signal output by the microprocessor and sent by the PWM driving chip to adjust the current of the load loop of the generator.
Optionally, when the selected load mode is an energy consumption load mode, the corresponding load calculation module is an energy consumption load calculation module, the operation parameter is a set signal duty ratio sent by the PWM driving chip, and the energy consumption load calculation module executes the following process:
and directly outputting the signal duty ratio sent by the PWM driving chip for driving and controlling the direct current chopper according to the set signal duty ratio sent by the PWM driving chip.
Optionally, when the selected load mode is a torque load mode, the corresponding load calculation module is a torque load calculation module, the operating parameter is a set torque value, the induction parameter is a real-time current and voltage feedback value of an armature of the generator, the fixed parameter is a product value of a potential constant and an excitation magnetic flux of the generator, and the torque load calculation module executes the following processes:
calculating to obtain a current regulation set value through a current regulation set value algorithm according to the set torque value, the potential constant of the generator and the parameters of the excitation magnetic flux;
calculating the current to be controlled of a starting motor load loop through a PI algorithm according to the deviation between the current regulation given value and the real-time current feedback value of the generator armature, and converting the current to be controlled into a signal duty ratio output sent by a PWM driving chip;
the current regulation given value algorithm specifically comprises the following steps:
wherein,
for the purpose of regulating the set value for the current,
in order to be able to set the torque value,
is the potential constant of the generator and is,
is the field flux of the generator.
Optionally, when the selected load mode is a power load mode, the corresponding load calculation module is a power load calculation module, the operation parameter is a set power value, the sensing parameter is a real-time current feedback value of the generator armature and a real-time voltage feedback value of the generator armature, and the power load calculation module executes the following processes:
calculating by a current regulation given value algorithm according to the set power value and the real-time voltage feedback value of the generator armature to obtain a current regulation given value;
calculating to obtain the current required to be controlled of a generator load loop through a PI algorithm according to the deviation between the current regulation given value and the real-time current feedback value of the generator armature, and converting the current required to be controlled into a signal duty ratio output sent by a PWM driving chip;
the current regulation given value algorithm specifically comprises the following steps:
wherein,
for the purpose of regulating the set value for the current,
in order to set the power value of the power,
is a real-time voltage feedback value of the armature of the generator.
Optionally, when the selected load mode is a fan load mode, the corresponding load calculation module is a fan load calculation module, the operating parameter is a set wind coefficient value, the induction parameter is a real-time voltage and current feedback value of an armature of the generator, the fixed parameter is a potential constant and an excitation magnetic flux of the generator, and the fan load calculation module executes the following processes:
calculating to obtain a current regulation set value through a current regulation set value algorithm according to the set parameters such as the value of the wind power coefficient, the potential constant of the generator, the excitation magnetic flux and the like;
calculating the current to be controlled of a load loop of the starting motor through a PI algorithm according to the deviation between the current regulation given value and a real-time current feedback value of the generator armature, and converting the current to be controlled of the load loop of the starting motor into a signal duty ratio output sent by a PWM driving chip;
the current regulation given value algorithm specifically comprises the following steps:
wherein,
for a set value of the windage coefficient,
is the potential constant of the generator and is,
is the field magnetic flux of the generator,
is a real-time voltage feedback value of the armature of the generator.
Optionally, the PI algorithm specifically includes:
wherein,
the current value required to be controlled of the load loop of the generator,
for the purpose of regulating the set value for the current,
the feedback value of the current of the armature of the generator is real-time,
is a preset proportional parameter of the PI error regulator,
the preset integral parameter is the PI error regulator.
Optionally, the human-computer interaction panel is further configured to display the measurement parameter values in real time, where the measurement parameter values include a torque value of the generator load loop and a power value of the generator load loop.
Optionally, when the selected load mode is an energy consumption load mode, a torque load mode or a fan load mode, the measurement parameter value displayed by the human-computer interaction panel is a torque value of a generator load loop, the corresponding load calculation module is an energy consumption load calculation module, a torque load calculation module or a fan load calculation module, the induction parameters are real-time current and voltage feedback values of a generator armature, the fixed parameters are product values of a potential constant and excitation magnetic flux of the generator, and the energy consumption load calculation module, the torque load calculation module or the fan load calculation module further performs the following processes:
calculating a torque value of a load loop of the generator through a torque value algorithm of the load loop of the generator according to parameters such as a real-time current feedback value of an armature of the generator, a potential constant of the generator, an excitation magnetic flux and the like;
the torque value algorithm of the generator load loop specifically comprises the following steps:
wherein,
is the torque value of the generator load circuit,
is a real-time current feedback value of the armature of the generator,
is the potential constant of the generator and is,
is the field flux of the generator.
Optionally, when the selected load mode is a power load mode, the measured parameter value displayed by the human-computer interaction panel is a power value of a load loop of the generator, the corresponding load calculation module is a power load calculation module, the sensing parameters are a real-time current feedback value of an armature of the generator and a real-time voltage feedback value of the armature of the generator, and the power load calculation modules each further perform the following processes:
calculating a power value of a load loop of the generator through a power value algorithm of the load loop of the generator according to a real-time current feedback value of the armature of the generator and a real-time voltage feedback value of the armature of the generator;
the power value algorithm of the generator load loop specifically comprises the following steps:
wherein,
is the power value of the load loop of the generator,
is a real-time voltage feedback value of the armature of the generator,
the feedback value is the real-time current feedback value of the armature of the generator.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention provides a multi-mode electronic torque load meter, which selects different load torque modes and sets operation parameters through a human-computer interaction panel, measures the working parameters of a generator through a Hall sensor, then the microprocessor calls the corresponding load calculation module and calls the needed parameters according to the selected load mode, the PWM driving chip is used for obtaining the duty ratio of a signal sent by the PWM driving chip for driving and controlling the direct current chopper, and finally the current of a load loop of the generator is adjusted through the direct current chopper, the load characteristics are automatically adjusted in a generator armature current closed-loop control mode, the microprocessor calls corresponding load calculation modules according to different selected load modes, load calculation modules corresponding to various load modes are provided, and the defect of single load working characteristics of the existing direct current generator load is overcome.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of a functional structure of a multi-mode electronic torque load meter provided by the present invention;
FIG. 2 is an electrical schematic diagram of the multi-mode electronic torque load meter of the present invention applied to a generator;
fig. 3 is a block diagram of a load control program of a microprocessor in the multi-mode electronic torque load meter according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
At present, electronic loads of various types on the market are limited to the application field of electrical circuits to realize automatic control and adjustment of load current, voltage, electric power or impedance, and no automatic adjusting device related to mechanical torque loads of motors is provided. Therefore, in order to overcome the defect of single load working characteristic of the load of the traditional direct current generator, the invention provides the electronic load torque meter with multiple selectable load modes, and simultaneously has the functions of load intensity adjustment and measurement display.
Adjusting and controlling the electromagnetic torque of the generator:
the electromagnetic torque definition and calculation formula of the direct current generator is as follows:
；
the generating potential of the direct current generator is defined and calculated by the formula:
；
the voltage drop across the generator armature can generally be neglected so that:
，
wherein,
the mechanical characteristic equation of the generator load is as follows:
；
in the field magnetic flux
Under the condition of keeping constant the flow of the air,
and
in direct proportional relation, control and regulate
Then realize to
Is adjusted, and
is measured by the PWM duty cycle of the DC chopper
Is prepared byImplementation, different load mode selection
Regulation law (i.e. of
Of the load) different load mechanical characteristics can be provided, namely:
therefore, the invention realizes the set generator torque characteristic by adjusting the output current of the generator.
Wherein,
as a function of the torque constant of the generator,
is the potential constant of the generator and is,
is the field magnetic flux of the generator,
the current value required to be controlled of the load loop of the generator,
to generate the electrical potential for the generator,
is a real-time voltage feedback value of the armature of the generator,
is the duty ratio of the signal sent by the PWM driving chip of the direct current chopper,
the output end of the chopper is externally connected with constant load electricityAnd (4) blocking.
A multi-mode electronic torque load meter realizes the regulation of the torque load of a prime motor (an alternating current motor and a direct current motor) by implementing different automatic control strategies on the electromagnetic torque of a direct current generator in a motor unit.
The PWM driving chip is a pulse width modulation driving chip, the torque load mode refers to a constant torque load mode, the PI algorithm is a proportional-integral control algorithm, and the power load mode is a constant power load mode.
Note: the generator armature loop current is equal to the generator load loop current.
As shown in FIG. 1, the multi-mode electronic torque load meter provided by the invention comprises a Hall sensor for detecting induction parameters obtained by a generator load loop, a direct current chopper for adjusting the current of the generator load loop, a microprocessor and a man-machine interaction panel;
the Hall sensor is used for measuring the voltage of an armature port of the generator and the current of the armature of the generator and feeding back the voltage and the current to the microprocessor through the signal conditioning circuit;
the man-machine interaction panel is used for selecting a load mode, setting operation parameters required by load calculation modules corresponding to different load modes, and displaying the load working parameters of the generator in real time during operation;
the microprocessor is used for calling the corresponding load calculation module according to the selected different load modes; the load calculation module is used for calling induction parameters and/or operation parameters and/or fixed parameters required by the load calculation module; the load calculation module is used for executing corresponding load calculation to obtain the duty ratio of a signal sent by a PWM driving chip used for driving and controlling the direct current chopper;
and the direct current chopper is connected with the output end of the microprocessor through the PWM driving chip and is used for acquiring the duty ratio of a signal output by the microprocessor and sent by the PWM driving chip to adjust the current of the load loop of the generator.
The invention provides a multi-mode electronic torque load instrument, firstly, a user sets operation parameters and selects a load mode through a man-machine interaction panel, then a Hall sensor detects an armature load loop of a generator to obtain induction parameters, then the microprocessor calls corresponding load calculation modules according to the selected different load modes, calls induction parameters and/or operation parameters and/or fixed parameters required by the calculation modules, finally executes the load calculation modules to obtain the duty ratio of signals sent by a PWM driving chip for driving and controlling the direct current chopper, then the direct current chopper adjusts the current of the load loop of the generator according to the duty ratio of the signal output by the microprocessor and sent by the PWM driving chip, and then realize load intensity and adjust, through set up multiple load calculation module in microprocessor, solved the single load working characteristic defect of current DC generator load.
Specifically, as shown in fig. 2, firstly, a user operates a human-computer interaction panel to set operation parameters and select a mode, then the human-computer interaction panel interacts with a microprocessor, at this time, a hall voltage sensor HV measures voltage at two ends of a generator armature, a hall current sensor HI measures current of the generator armature, then measured induction parameters are fed back to the microprocessor through signal conditioning current, the microprocessor calls a corresponding load calculation module according to the selected load mode to obtain a signal duty ratio sent by a PWM driving chip, the signal duty ratio sent by the PWM driving chip is output to the PWM driving chip connected with an output end of the microprocessor, and then a direct current chopper is driven to adjust the current of a load loop of the generator, so that adjustment of load intensity is realized.
In FIG. 2, TV is a triode, VD is a diode, L is an inductor, and a constant load resistor is externally connected to the output end of the chopper
And the PWM driving chip forms a current loop.
As shown in FIG. 3, before the multi-mode electronic torque load meter is operated, the microprocessor is also used for adjusting the constant load resistance value and the generator power generation parameter
Initialization of preset proportional and integral parameter values of PI error regulatorAnd converting the load into a fixed parameter required by calling a subsequent load calculation module.
When the selected load mode is the energy consumption load mode, the corresponding load calculation module is the energy consumption load calculation module, the operation parameter is the signal duty ratio sent by the set PWM driving chip, and the energy consumption load calculation module executes the following processes:
and directly outputting the signal duty ratio sent by the PWM driving chip for driving and controlling the direct current chopper according to the set signal duty ratio sent by the PWM driving chip.
The set duty ratio of the signal sent by the PWM driving chip is set artificially, and the direct current chopper is driven and controlled to output through the PWM driving chip according to the artificially set duty ratio of the signal.
When the selected load mode is a torque load mode, the corresponding load calculation module is a torque load calculation module, the operation parameter is a set torque value, the induction parameter is a real-time current feedback value of an armature of the generator, the fixed parameter is a product value of a potential constant and an excitation magnetic flux of the generator, and the torque load calculation module executes the following processes:
calculating to obtain a current regulation set value through a current regulation set value algorithm according to a set torque value, a potential constant of the generator and parameters of excitation magnetic flux;
calculating the current to be controlled of a starting motor load loop through a PI algorithm according to the deviation of the current regulation given value and the real-time current feedback value of the generator armature, and converting the current to be controlled into a signal duty ratio output sent by a PWM driving chip;
the current regulation given value algorithm specifically comprises the following steps:
wherein,
for the purpose of regulating the set value for the current,
in order to be able to set the torque value,
is the potential constant of the generator and is,
is the field flux of the generator.
Specifically, the PI algorithm specifically includes:
wherein,
the current value required to be controlled of the load loop of the generator,
for the purpose of regulating the set value for the current,
the feedback value of the current of the armature of the generator is real-time,
is a preset proportional parameter of the PI error regulator,
the preset integral parameter is the PI error regulator.
When the selected load mode is the power load mode, the corresponding load calculation module is the power load calculation module, the operation parameter is a set power value, the induction parameter is a real-time current feedback value of the armature of the generator and a real-time voltage feedback value of the armature of the generator, and the power load calculation module executes the following processes:
calculating by a current regulation given value algorithm according to the set power value and the real-time voltage feedback value of the generator armature to obtain a current regulation given value;
calculating to obtain the current to be controlled of a generator load loop through a PI algorithm according to the deviation of the current regulation given value and the real-time current feedback value of the generator armature, and converting the current to be controlled into a signal duty ratio output sent by a PWM driving chip;
the current regulation given value algorithm specifically comprises the following steps:
wherein,
for the purpose of regulating the set value for the current,
in order to set the power value of the power,
is a real-time voltage feedback value of the armature of the generator. The PI algorithm is consistent with the PI algorithm in the torque load, and is not described herein again.
When the selected load mode is the fan load mode, the corresponding load calculation module is a fan load calculation module, the operation parameter is a set wind coefficient value, the induction parameter is a real-time voltage and current feedback value of a generator armature, the fixed parameter is a potential constant and excitation flux of the generator, and the fan load calculation module executes the following processes:
calculating to obtain a current regulation set value through a current regulation set value algorithm according to the set parameters such as the wind power coefficient value, the potential constant of the generator, the excitation magnetic flux and the like;
calculating the current to be controlled of a load loop of the starting motor through a PI algorithm according to the deviation between the current regulation given value and a real-time current feedback value of the armature of the generator, and converting the current to be controlled of the load loop of the generator into a signal duty ratio output sent by a PWM driving chip;
the current regulation given value algorithm specifically comprises the following steps:
wherein,
for a set value of the windage coefficient,
is the potential constant of the generator and is,
is the field magnetic flux of the generator,
is a real-time voltage feedback value of the armature of the generator. The PI algorithm is consistent with the PI algorithm in the torque load, and is not described herein again.
The man-machine interaction panel is also used for displaying measurement and calculation parameter values in real time, and the measurement and calculation parameters comprise a torque value of a load loop of the generator and a power value of the load loop of the generator.
Specifically, when the selected load mode is an energy consumption load mode, a torque load mode or a fan load mode, the measurement parameter value displayed by the human-computer interaction panel is a torque value of a generator load loop, the corresponding load calculation module is an energy consumption load calculation module, a torque load calculation module or a fan load calculation module, the induction parameters are real-time current and voltage feedback values of a generator armature, the fixed parameters are product values of a potential constant and excitation magnetic flux of the generator, and the energy consumption load calculation module, the torque load calculation module or the fan load calculation module further executes the following processes:
calculating a torque value of a load loop of the generator through a torque value algorithm of the load loop of the generator according to parameters such as a real-time current feedback value of an armature of the generator, a potential constant of the generator, an excitation magnetic flux and the like;
the torque value algorithm of the generator load loop specifically comprises the following steps:
wherein,
is the torque value of the generator load circuit,
is a real-time current feedback value of the armature of the generator,
is the potential constant of the generator and is,
is the field magnetic flux of the generator,
the value of the generator is derived from the parameter conversion or experimental determination result of the rated nameplate of the generator, and the generator works in a separately excited rated excitation mode.
Specifically, when the selected load mode is the power load mode, the measurement parameter value displayed by the human-computer interaction panel is the power value of the generator load loop, the corresponding load calculation module is the power load calculation module, the induction parameters are the real-time current feedback value of the generator armature and the real-time voltage feedback value of the generator armature, and the power load calculation modules all further execute the following processes:
calculating the power value of the generator load loop through a power value algorithm of the generator load loop according to the real-time current feedback value of the generator armature and the real-time voltage feedback value of the generator armature;
the power value algorithm of the generator load loop specifically comprises the following steps:
wherein,
is the power value of the load loop of the generator,
is a real-time voltage feedback value of the armature of the generator,
the feedback value is the real-time current feedback value of the armature of the generator.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A multi-mode electronic torque load meter is characterized by comprising a Hall sensor for detecting induction parameters obtained by a generator load loop, a direct current chopper for adjusting the current of the generator load loop, a microprocessor and a human-computer interaction panel;
the Hall sensor is used for measuring the voltage of the armature port of the generator and the current of the armature of the generator and feeding back the voltage and the current to the microprocessor through the signal conditioning circuit;
the man-machine interaction panel is used for selecting a load mode, setting operation parameters required by load calculation modules corresponding to different load modes, and displaying the load working parameters of the generator in real time during operation;
the microprocessor is used for calling the corresponding load calculation module according to the selected different load modes; the load calculation module is used for calling induction parameters and/or operation parameters and/or fixed parameters required by the load calculation module; the load calculation module is used for executing the corresponding load calculation module to obtain the duty ratio of a signal sent by a PWM driving chip used for driving and controlling the direct current chopper;
and the direct current chopper is connected with the output end of the microprocessor through a PWM driving chip and is used for acquiring the duty ratio of a signal output by the microprocessor and sent by the PWM driving chip to adjust the current of the load loop of the generator.
2. The multi-mode electronic torque load meter according to claim 1, wherein when the selected load mode is an energy consumption load mode, the corresponding load calculation module is an energy consumption load calculation module, the operation parameter is a set duty ratio of a signal sent by the PWM driving chip, and the energy consumption load calculation module performs the following process:
and directly outputting the signal duty ratio sent by the PWM driving chip for driving and controlling the direct current chopper according to the set signal duty ratio sent by the PWM driving chip.
3. The multi-mode electronic torque load instrument according to claim 1, wherein when the selected load mode is a torque load mode, the corresponding load calculation module is a torque load calculation module, the operation parameter is a set torque value, the induction parameter is a real-time current and voltage feedback value of a generator armature, the fixed parameter is a product value of a potential constant and an excitation magnetic flux of the generator, and the torque load calculation module performs the following process:
calculating to obtain a current regulation set value through a current regulation set value algorithm according to the set torque value, the potential constant of the generator and the parameters of the excitation magnetic flux;
calculating the current to be controlled of a starting motor load loop through a PI algorithm according to the deviation between the current regulation given value and the real-time current feedback value of the generator armature, and converting the current to be controlled into a signal duty ratio output sent by a PWM driving chip;
the current regulation given value algorithm specifically comprises the following steps:
wherein,
for the purpose of regulating the set value for the current,
in order to be able to set the torque value,
is the potential constant of the generator and is,
is the field flux of the generator.
4. The multi-mode electronic torque load meter according to claim 1, wherein when the selected load mode is a power load mode, the corresponding load calculation module is a power load calculation module, the operation parameter is a set power value, the sensing parameter is a real-time current feedback value of a generator armature and a real-time voltage feedback value of the generator armature, and the power load calculation module performs the following processes:
calculating by a current regulation given value algorithm according to the set power value and the real-time voltage feedback value of the generator armature to obtain a current regulation given value;
calculating to obtain the current required to be controlled of a generator load loop through a PI algorithm according to the deviation between the current regulation given value and the real-time current feedback value of the generator armature, and converting the current required to be controlled into a signal duty ratio output sent by a PWM driving chip;
the current regulation given value algorithm specifically comprises the following steps:
wherein,
for the purpose of regulating the set value for the current,
in order to set the power value of the power,
is a real-time voltage feedback value of the armature of the generator.
5. The multi-mode electronic torque load meter according to claim 1, wherein when the selected load mode is a fan load mode, the corresponding load calculation module is a fan load calculation module, the operation parameter is a set wind coefficient value, the induction parameter is a real-time voltage and current feedback value of an armature of the generator, the fixed parameter is a potential constant and an excitation flux of the generator, and the fan load calculation module performs the following processes:
calculating to obtain a current regulation set value through a current regulation set value algorithm according to the set parameters such as the value of the wind power coefficient, the potential constant of the generator, the excitation magnetic flux and the like;
calculating the current to be controlled of a load loop of the starting motor through a PI algorithm according to the deviation between the current regulation given value and a real-time current feedback value of the generator armature, and converting the current to be controlled of the load loop of the starting motor into a signal duty ratio output sent by a PWM driving chip;
the current regulation given value algorithm specifically comprises the following steps:
wherein,
for a set value of the windage coefficient,
is the potential constant of the generator and is,
is the field magnetic flux of the generator,
is a real-time voltage feedback value of the armature of the generator.
6. The multi-mode electronic torque load meter according to any one of claims 3-5, wherein the PI algorithm is embodied as:
wherein,
the current value required to be controlled of the load loop of the generator,
for the purpose of regulating the set value for the current,
the feedback value of the current of the armature of the generator is real-time,
is a preset proportional parameter of the PI error regulator,
the preset integral parameter is the PI error regulator.
7. The multi-mode electronic torque load meter according to any one of claims 1-5, wherein the human-machine interface panel is further configured to display the measurement parameters in real time, wherein the measurement parameters include a torque value of the generator load loop and a power value of the generator load loop.
8. The multi-mode electronic torque load instrument according to claim 7, wherein when the selected load mode is an energy consumption load mode, a torque load mode or a fan load mode, the measured parameter value displayed by the human-computer interaction panel is a torque value of a generator load loop, the corresponding load calculation module is an energy consumption load calculation module, a torque load calculation module or a fan load calculation module, the induction parameters are real-time current and voltage feedback values of a generator armature, the fixed parameters are product values of a potential constant and excitation magnetic flux of the generator, and the energy consumption load calculation module, the torque load calculation module or the fan load calculation module further performs the following processes:
calculating a torque value of a load loop of the generator through a torque value algorithm of the load loop of the generator according to parameters such as a real-time current feedback value of an armature of the generator, a potential constant of the generator, an excitation magnetic flux and the like;
the torque value algorithm of the generator load loop specifically comprises the following steps:
wherein,
is the torque value of the generator load circuit,
is a real-time current feedback value of the armature of the generator,
is the potential constant of the generator and is,
is the field flux of the generator.
9. The multi-mode electronic torque load instrument according to claim 7, wherein when the selected load mode is a power load mode, the measured parameter value displayed by the human-computer interaction panel is a power value of a generator load loop, the corresponding load calculation module is a power load calculation module, the sensing parameters are a real-time current feedback value of a generator armature and a real-time voltage feedback value of the generator armature, and the power load calculation modules further perform the following processes:
calculating a power value of a load loop of the generator through a power value algorithm of the load loop of the generator according to a real-time current feedback value of the armature of the generator and a real-time voltage feedback value of the armature of the generator;
the power value algorithm of the generator load loop specifically comprises the following steps:
wherein,
is the power value of the load loop of the generator,
is a real-time voltage feedback value of the armature of the generator,
the feedback value is the real-time current feedback value of the armature of the generator.
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