CN111490707A - A multi-mode electronic torque load meter - Google Patents

Abstract

The invention discloses a multi-mode electronic torque load meter. Load mode and setting the operating parameters required by the load calculation module corresponding to different load modes; the microprocessor is used to call the corresponding load calculation module according to the selected different load modes; used to call the induction parameters and/or load calculation modules required by the load calculation module Operating parameters and/or fixed parameters; used to execute the corresponding load calculation module to obtain the duty cycle of the signal sent by the PWM driver chip used to drive and control the DC chopper, thereby adjusting the current size of the generator load circuit. It solves the defect of single load working characteristics, has the function of automatic adjustment of load intensity and real-time display, and realizes the given generator torque characteristics.

Description

A multi-mode electronic torque load meter

technical field

The invention relates to the field of electrical engineering, in particular to a multi-mode electronic torque load meter.

Background technique

In the existing electrical motor experimental devices, the working mode of the motor unit (motor-DC generator) is widely used, and the DC generator is used as the torque load adjustment device of the prime mover. The generator voltage for short) changes synchronously with the rotational speed, and there are three major defects: 1) Its mechanical characteristics of the load show a ramp function law, that is, the linear energy consumption load characteristics, which cannot provide other commonly used types of torque loads for experiments, such as constant rotation. Torque reaction load, constant mechanical power load, fan load, etc., seriously restrict the development effect of electric motor teaching experiments; 2) The traditional generator load torque adjustment is manually operated through an external adjustable resistor, which has poor real-time and accuracy; 3 ) cannot directly read the load torque, and can only be manually converted by the motor armature current. At present, various types of electronic loads on the market are limited to the application field of electrical circuits to realize automatic controllable and adjustable load current, voltage, electric power or impedance, and there is no automatic adjustment device involving the mechanical torque load of the motor.

SUMMARY OF THE INVENTION

In view of the above problems, the purpose of the present invention is to provide a multi-mode electronic torque load meter, which aims to solve the defect of the single load working characteristic of the existing DC generator load, and provides an electronic torque load meter with multiple load modes optional, It has the function of automatic adjustment of load intensity.

The present invention is achieved through the following technical solutions:

A multi-mode electronic torque load meter, comprising a Hall sensor for detecting a generator load loop to obtain inductive parameters, a DC chopper for adjusting the current size of the generator load loop, a microprocessor and a human-computer interaction panel;

a Hall sensor for measuring the generator armature port voltage and the generator armature current and feeding back to the microprocessor through a signal conditioning circuit;

The human-computer interaction panel is used to select the load mode and set the operating parameters required by the load calculation module corresponding to different load modes, and display the load working parameters of the generator in real time during operation;

The microprocessor is used to call the corresponding load calculation module according to the selected different load modes; used to call the induction parameters and/or operating parameters and/or fixed parameters required by the load calculation module; used to execute the corresponding The load calculation module obtains the duty ratio of the signal sent by the PWM driver chip for driving and controlling the DC chopper;

The DC chopper is connected to the output end of the microprocessor through the PWM drive chip, and is used to obtain the duty cycle of the signal output by the PWM drive chip output by the microprocessor to adjust the generator load loop. current size.

Optionally, when the selected load mode is an energy consumption load mode, the corresponding load calculation module is an energy consumption load calculation module, and the operation parameter is the signal duty cycle sent by the set PWM drive chip, and the The energy consumption load calculation module performs the following processes:

According to the set duty ratio of the signal sent by the PWM driving chip, the duty ratio of the signal sent by the PWM driving chip for driving and controlling the DC chopper is directly output.

Optionally, 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, and the induction parameter is the generator armature. The real-time current and voltage feedback value of , the fixed parameter is the product value of the potential constant of the generator and the excitation magnetic flux, and the torque load calculation module performs the following process:

According to the set torque value, the potential constant of the generator and the parameters of the excitation magnetic flux, the current adjustment given value is calculated by the current adjustment given value algorithm;

According to the deviation of the current regulation given value and the real-time current feedback value of the generator armature, the required control current of the generator load circuit is calculated by the PI algorithm, and the required current is converted into the signal sent by the PWM drive chip. empty ratio output;

The specific algorithm of the current regulation given value is:

，

,

为电流调节给定值，

为设定的转矩值，

为发电机的电势常数，

为发电机的励磁磁通。in,

to adjust the given value for the current,

is the set torque value,

is the potential constant of the generator,

is the excitation 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, and the induction parameter is the real-time current of the generator armature. The feedback value and the real-time voltage feedback value of the generator armature, the power load calculation module performs the following process:

According to the set power value and the real-time voltage feedback value of the generator armature, the current adjustment given value is calculated by the current adjustment given value algorithm;

According to the deviation of the current regulation given value and the real-time current feedback value of the generator armature, the current to be controlled in the generator load circuit is calculated by the PI algorithm, and the current to be controlled is converted into the signal sent by the PWM drive chip. than output;

The specific algorithm of the current regulation given value is:

，

,

为电流调节给定值，

为设定的功率值，

为发电机电枢的实时电压反馈值。in,

to adjust the given value for the current,

is the set power value,

is the real-time voltage feedback value of the generator armature.

Optionally, when the selected load mode is the fan load mode, the corresponding load calculation module is the fan load calculation module, the operation parameter is the set wind coefficient value, and the induction parameter is the real-time value of the generator armature. Voltage and current feedback values, the fixed parameters are the potential constant of the generator and the excitation magnetic flux, and the fan load calculation module performs the following processes:

According to the set wind coefficient value, the potential constant of the generator and the excitation magnetic flux and other parameters, the current adjustment given value is calculated by the current adjustment given value algorithm;

According to the deviation of the current regulation given value and the real-time current feedback value of the generator armature, the required control current of the generator load circuit is calculated through the PI algorithm, and the required control current of the generator load circuit is converted into PWM The duty cycle output of the signal sent by the driver chip;

The specific algorithm of the current regulation given value is:

，

,

为设定的风力系数值，

为发电机的电势常数，

为发电机的励磁磁通，

为发电机电枢的实时电压反馈值。in,

is the set wind coefficient value,

is the potential constant of the generator,

is the excitation flux of the generator,

is the real-time voltage feedback value of the generator armature.

Optionally, the PI algorithm is specifically:

；

;

为发电机负载回路的需控电流值，

为电流调节给定值，

为发电机电枢实时电流反馈值，

为PI误差调节器的预置比例参数，

为PI误差调节器的预置积分参数。in,

is the controlled current value of the generator load circuit,

to adjust the given value for the current,

is the real-time current feedback value of the generator armature,

is the preset proportional parameter of the PI error regulator,

Preset integral parameters for the PI error regulator.

Optionally, the human-computer interaction panel is further configured to display measured parameter values in real time, and the measured and calculated parameters include the torque value of the generator load circuit and the power value of the generator load circuit.

Optionally, when the selected load mode is the energy consumption load mode, the torque load mode or the fan load mode, the measured parameter value displayed on the human-computer interaction panel is the torque value of the generator load circuit, and the corresponding The load calculation module is an energy consumption load calculation module, a torque load calculation module or a fan load calculation module, the inductive parameters are the real-time current and voltage feedback values of the generator armature, and the fixed parameters are the potential constant and the voltage of the generator. The product value of the excitation magnetic flux, the energy consumption load calculation module, the torque load calculation module or the fan load calculation module also performs the following process:

According to the real-time current feedback value of the generator armature, the potential constant of the generator and the excitation magnetic flux and other parameters, the torque value of the generator load circuit is calculated by the torque value algorithm of the generator load circuit;

The torque value algorithm of the generator load circuit is specifically:

，

,

为发电机负载回路的转矩值，

为发电机电枢的实时电流反馈值，

为发电机的电势常数，

为发电机的励磁磁通。in,

is the torque value of the generator load circuit,

is the real-time current feedback value of the generator armature,

is the potential constant of the generator,

is the excitation flux of the generator.

Optionally, when the selected load mode is the power load mode, the measured parameter value displayed on the human-computer interaction panel is the power value of the generator load circuit, and the corresponding load calculation module is a power load calculation module, and the The induction parameters are both 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 module also performs the following process:

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 of the generator load circuit is obtained by calculating the power value algorithm of the generator load circuit;

The power value algorithm of the generator load circuit is specifically:

，

,

为发电机负载回路的功率值，

为发电机电枢的实时电压反馈值，

为发电机电枢的实时电流反馈值。in,

is the power value of the generator load circuit,

is the real-time voltage feedback value of the generator armature,

is the real-time current feedback value of the generator armature.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

The multi-mode electronic torque load meter provided by the present invention selects different load torque modes and sets operating parameters through the human-computer interaction panel, measures the working parameters of the generator through the Hall sensor, and then uses the microprocessor to measure the working parameters according to the selected parameters. The selected load mode calls the corresponding load calculation module and calls the required parameters to obtain the duty cycle of the signal sent by the PWM driver chip that drives and controls the DC chopper, and finally adjusts the generator through the DC chopper The current size of the load loop realizes the automatic adjustment of the load characteristics by means of the closed-loop control of the generator armature current. The microprocessor calls the corresponding load calculation module according to the selected different load modes, and provides load calculation modules corresponding to various load modes. , which solves the defect of the single load working characteristic of the existing DC generator load.

Description of drawings

The accompanying drawings described herein are used to provide further understanding of the embodiments of the present invention, and constitute a part of the present application, and do not constitute limitations to the embodiments of the present invention. In the attached image:

Fig. 1 is the functional structure schematic diagram of the multi-mode electronic torque load meter provided by the present invention;

2 is an electrical schematic diagram of the application of the multi-mode electronic torque load meter provided by the present invention to a generator;

FIG. 3 is a block diagram of the load control program of the microprocessor in the multi-mode electronic torque load meter provided by the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and the accompanying drawings. as a limitation of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail in order to avoid obscuring the present invention.

Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention in at least one embodiment. Thus, 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 subcombination in one or more embodiments or examples. Furthermore, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and that the drawings 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, various types of electronic loads on the market are limited to the application field of electrical circuits to realize automatic controllable and adjustable load current, voltage, electric power or impedance, and there is no automatic adjustment device involving the mechanical torque load of the motor. Therefore, in order to overcome the defect of the single load working characteristic of the existing DC generator load, the present invention provides an electronic load torque meter with multiple load modes selectable, and also has the functions of load intensity adjustment and measurement display.

Adjustment control of generator electromagnetic torque:

；Definition and calculation formula of electromagnetic torque of DC generator:

;

；Definition and calculation formula of power generation potential of DC generator:

;

，

Generally, the internal resistance voltage drop of the generator armature can be ignored, so that:

,

in,

；Generator load mechanical characteristic equation formula:

;

保持恒定情况下，

与

成正比例关系，控制调节

，就实现对

的调节，而

的大小通过直流斩波器PWM占空比

的调节实现，不同负载模式选择不同的

调节规律（即

的变化规律），就可以提供不同的负载机械特性，即：

，因此，本发明通过调节发电机输出电流大小，进而实现既定发电机转矩特性。in the excitation flux

kept constant,

and

Proportional relationship, control regulation

, it is true

adjustment, while

The size of the PWM duty cycle through the DC chopper

The adjustment is realized, different load modes choose different

regulation (i.e.

The changing law), it can provide different mechanical characteristics of the load, namely:

Therefore, the present invention realizes a given generator torque characteristic by adjusting the output current of the generator.

为发电机转矩常数，

为发电机的电势常数，

为发电机的励磁磁通，

为发电机负载回路的需控电流值，

为发电机发电电势，

为发电机电枢的实时电压反馈值，

为直流斩波器 PWM驱动芯片所发出的信号占空比，

为斩波器输出端外接恒定负载电阻。in,

is the generator torque constant,

is the potential constant of the generator,

is the excitation flux of the generator,

is the controlled current value of the generator load circuit,

generating potential for the generator,

is the real-time voltage feedback value of the generator armature,

is the duty cycle of the signal sent by the DC chopper PWM driver chip,

Connect a constant load resistor to the output of the chopper.

A multi-mode electronic torque load meter realizes the adjustment of the torque load of the prime mover (AC and DC motors) by implementing different automatic control strategies for the electromagnetic torque of the DC generator in the motor unit.

The PWM drive chip is a pulse width modulation drive chip, the torque load mode refers to the 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 circuit current is equivalent to the generator load circuit current.

As shown in FIG. 1, a multi-mode electronic torque load meter provided by the present invention includes a Hall sensor for detecting the generator load loop to obtain inductive parameters, a DC chopper for adjusting the current size of the generator load loop, and a microprocessor. and human-computer interaction panel;

Hall sensor, used to measure the generator armature port voltage and generator armature current and feed back to the microprocessor through the signal conditioning circuit;

The human-computer interaction panel is used to select the load mode and set the operating parameters required by the load calculation module corresponding to different load modes, and display the load working parameters of the generator in real time during operation;

The microprocessor is used to call the corresponding load calculation module according to the selected different load modes; it is used to call the induction parameters and/or operating parameters and/or fixed parameters required by the load calculation module; it is used to execute the corresponding load calculation module to Obtain the duty cycle of the signal sent by the PWM driver chip used to drive and control the DC chopper;

The DC chopper is connected to the output end of the microprocessor through the PWM drive chip, and is used to obtain the duty cycle of the signal sent by the PWM drive chip output by the microprocessor to adjust the current size of the generator load circuit.

In the multi-mode electronic torque load meter provided by the present invention, the user first sets the operating parameters and selects the load mode through the human-computer interaction panel, and then detects the generator armature load loop through the Hall sensor to obtain the induction parameters, Then the microprocessor calls the corresponding load calculation module according to the selected different load modes and calls the induction parameters and/or operating parameters and/or fixed parameters required by the calculation module, and finally executes the load calculation module to obtain the drive control DC chopper The duty cycle of the signal sent by the PWM driver chip of the generator, and then the DC chopper adjusts the current size of the generator load circuit according to the signal duty cycle sent by the PWM driver chip output by the microprocessor, thereby realizing the adjustment of the load intensity. , By setting up multiple load calculation modules in the microprocessor, the defect of the single load working characteristic of the existing DC generator load is solved.

Specifically, as shown in Figure 2, first, the user operates the human-computer interaction panel to set the operating parameters and select the mode, and then the human-computer interaction panel interacts with the microprocessor. At this time, the Hall voltage sensor HV measures the generator armature The voltage at both ends, the Hall current sensor HI measures the armature current of the generator, and then the inductive parameters obtained after the measurement are fed back to the microprocessor through the signal conditioning current, and the microprocessor calls the corresponding load calculation module according to the selected load mode to obtain the PWM The duty cycle of the signal sent by the drive chip is output to the PWM drive chip connected to the output end of the microprocessor, and then drives the DC chopper to adjust the generator load loop. The size of the current can realize the adjustment of the load intensity.

和PWM驱动芯片组成了一个电流回路。In Figure 2, TV is a transistor, VD is a diode, L is an inductance coil, and the output end of the chopper is connected to a constant load resistance

It forms a current loop with the PWM driver chip.

、PI误差调节器的预置比例和积分参数值进行初始化，以作为调用后续负载计算模块所需的固定参数。As shown in Figure 3, before the multi-mode electronic torque load meter is operating, the microprocessor is also used for the constant load resistance value, generator power generation parameters

, The preset proportional and integral parameter values of the PI error regulator are initialized as fixed parameters required to call the subsequent load calculation module.

Among them, when the selected load mode is the energy consumption load mode, the corresponding load calculation module is the energy consumption load calculation module, the operating parameter is the signal duty cycle sent by the set PWM driver chip, and the energy consumption load calculation module performs the following process :

According to the set signal duty cycle sent by the PWM drive chip, the signal duty cycle sent by the PWM drive chip used to drive and control the DC chopper is directly output.

Among them, the duty cycle of the signal sent by the set PWM drive chip is manually set, and according to the artificially set signal duty cycle, the DC chopper is driven and controlled by the PWM drive chip for output.

Wherein, when the selected load mode is the torque load mode, the corresponding load calculation module is the torque load calculation module, the operating parameter is the set torque value, and the induction parameter is the real-time current feedback value of the generator armature, The fixed parameter is the product of the generator's potential constant and the excitation magnetic flux. The torque load calculation module performs the following processes:

According to the set torque value, the potential constant of the generator and the parameters of the excitation magnetic flux, the current adjustment given value is calculated by the current adjustment given value algorithm;

According to the deviation of the current adjustment given value and the real-time current feedback value of the generator armature, the current to be controlled in the load circuit of the generator is calculated by the PI algorithm, and the current to be controlled is converted into the signal duty cycle output by the PWM drive chip;

The specific algorithm of current regulation given value is:

，

,

为电流调节给定值，

为设定的转矩值，

为发电机的电势常数，

为发电机的励磁磁通。in,

to adjust the given value for the current,

is the set torque value,

is the potential constant of the generator,

is the excitation flux of the generator.

Specifically, the PI algorithm is as follows:

；

;

为发电机负载回路的需控电流值，

为电流调节给定值，

为发电机电枢实时电流反馈值，

为PI误差调节器的预置比例参数，

为PI误差调节器的预置积分参数。in,

is the controlled current value of the generator load circuit,

to adjust the given value for the current,

is the real-time current feedback value of the generator armature,

is the preset proportional parameter of the PI error regulator,

Preset integral parameters for the PI error regulator.

Wherein, when the selected load mode is the power load mode, the corresponding load calculation module is the power load calculation module, the operating parameter is the set power value, and the induction parameter is the real-time current feedback value of the generator armature and the real-time current feedback value of the generator armature. The voltage feedback value, the power load calculation module performs the following process:

According to the set power value and the real-time voltage feedback value of the generator armature, the current adjustment given value is calculated by the current adjustment given value algorithm;

According to the deviation of the current regulation given value and the real-time current feedback value of the generator armature, the current to be controlled by the generator load circuit is calculated through the PI algorithm, and the current to be controlled is converted into the signal duty cycle output from the PWM drive chip;

The specific algorithm of current regulation given value is:

，

,

为电流调节给定值，

为设定的功率值，

为发电机电枢的实时电压反馈值。其中PI算法与转矩负载中的PI算法一致，在此不再赘述。in,

to adjust the given value for the current,

is the set power value,

is the real-time voltage feedback value of the generator armature. The PI algorithm is consistent with the PI algorithm in the torque load, and will not be repeated here.

Among them, when the selected load mode is the fan load mode, the corresponding load calculation module is the fan load calculation module, the operating parameter is the set wind coefficient value, the induction parameter is the real-time voltage and current feedback value of the generator armature, and the fixed parameter For the generator's potential constant and field flux, the fan load calculation module performs the following process:

According to the set wind coefficient value, the potential constant of the generator and the excitation magnetic flux and other parameters, the current adjustment given value is calculated by the current adjustment given value algorithm;

According to the deviation of the current regulation set value and the real-time current feedback value of the generator armature, the required control current of the generator load circuit is calculated by the PI algorithm, and the required control current of the generator load circuit is converted into the signal sent by the PWM drive chip. duty cycle output;

The specific algorithm of current regulation given value is:

，

,

为设定的风力系数值，

为发电机的电势常数，

为发电机的励磁磁通，

为发电机电枢的实时电压反馈值。其中的PI算法与转矩负载中的PI算法一致，在此不再赘述。in,

is the set wind coefficient value,

is the potential constant of the generator,

is the excitation flux of the generator,

is the real-time voltage feedback value of the generator armature. The PI algorithm is consistent with the PI algorithm in the torque load, and will not be repeated here.

Among them, the human-computer interaction panel is also used to display the measured parameter values in real time, and the measured parameters include the torque value of the generator load circuit and the power value of the generator load circuit.

Specifically, when the selected load mode is energy consumption load mode, torque load mode or fan load mode, the measured parameter value displayed on the human-computer interaction panel is the torque value of the generator load circuit, and the corresponding load calculation module is the energy In the load consumption calculation module, torque load calculation module or fan load calculation module, the induction parameters are the real-time current and voltage feedback values of the generator armature, and the fixed parameters are the product value of the potential constant of the generator and the excitation magnetic flux. The load calculation module, torque load calculation module or fan load calculation module also performs the following process:

According to the real-time current feedback value of the generator armature, the potential constant of the generator and the excitation magnetic flux and other parameters, the torque value of the generator load circuit is calculated by the torque value algorithm of the generator load circuit;

The torque value algorithm of the generator load circuit is as follows:

，

,

为发电机负载回路的转矩值，

为发电机电枢的实时电流反馈值，

为发电机的电势常数，

为发电机的励磁磁通，

的取值来源于发电机额定铭牌参数换算或实验测定结果，发电机采用他励额定励磁方式工作。in,

is the torque value of the generator load circuit,

is the real-time current feedback value of the generator armature,

is the potential constant of the generator,

is the excitation flux of the generator,

The value of is derived from the conversion of the rated nameplate parameters of the generator or the experimental measurement results, and the generator works in the separately excited rated excitation mode.

Specifically, when the selected load mode is the power load mode, the measured parameter value displayed on the human-computer interaction panel is the power value of the generator load circuit, the corresponding load calculation module is the power load calculation module, and the induction parameters are the generator armatures. The real-time current feedback value of the generator armature and the real-time voltage feedback value of the generator armature, the power load calculation module also performs the following processes:

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 of the generator load circuit is calculated by the power value algorithm of the generator load circuit;

The power value algorithm of the generator load circuit is as follows:

，

,

为发电机负载回路的功率值，

为发电机电枢的实时电压反馈值，

为发电机电枢的实时电流反馈值。in,

is the power value of the generator load circuit,

is the real-time voltage feedback value of the generator armature,

is the real-time current feedback value of the generator armature.

The specific embodiments described above further describe the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. a multi-mode electronic torque load meter, is characterized in that, comprises the Hall sensor that detects the load circuit of generator and obtains the induction parameter, the DC chopper that regulates the current size of the load circuit of described generator, microprocessor and human. computer interaction panel; a Hall sensor for measuring the generator armature port voltage and the generator armature current and feeding back to the microprocessor through a signal conditioning circuit; The human-computer interaction panel is used to select the load mode and set the operating parameters required by the load calculation module corresponding to different load modes, and display the load working parameters of the generator in real time during operation; The microprocessor is used to call the corresponding load calculation module according to the selected different load modes; used to call the induction parameters and/or operating parameters and/or fixed parameters required by the load calculation module; used to execute the corresponding The load calculation module obtains the duty ratio of the signal sent by the PWM driver chip for driving and controlling the DC chopper; The DC chopper is connected to the output end of the microprocessor through the PWM drive chip, and is used to obtain the duty cycle of the signal output by the PWM drive chip output by the microprocessor to adjust the generator load loop. current size. 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, and the operation parameter For the set signal duty cycle sent by the PWM drive chip, the energy consumption load calculation module performs the following process: According to the set duty ratio of the signal sent by the PWM driving chip, the duty ratio of the signal sent by the PWM driving chip for driving and controlling the DC chopper is directly output. 3. The multi-mode electronic torque load meter 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, and the operation The parameter is the set torque value, the induction parameter is the real-time current and voltage feedback value of the generator armature, the fixed parameter is the product value of the potential constant of the generator and the excitation magnetic flux, and the torque load calculation module Perform the following procedure: According to the set torque value, the potential constant of the generator and the parameters of the excitation magnetic flux, the current adjustment given value is calculated by the current adjustment given value algorithm; According to the deviation of the current regulation given value and the real-time current feedback value of the generator armature, the required control current of the generator load circuit is calculated by the PI algorithm, and the required current is converted into the signal sent by the PWM drive chip. empty ratio output; The specific algorithm of the current regulation given value is:

, in,

to adjust the given value for the current,

is the set torque value,

is the potential constant of the generator,

is the excitation 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, and the operating parameter is The set power value, the induction parameter is 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 module performs the following process: According to the set power value and the real-time voltage feedback value of the generator armature, the current adjustment given value is calculated by the current adjustment given value algorithm; According to the deviation of the current regulation given value and the real-time current feedback value of the generator armature, the current to be controlled in the generator load circuit is calculated by the PI algorithm, and the current to be controlled is converted into the signal sent by the PWM drive chip. than output; The specific algorithm of the current regulation given value is:

, in,

to adjust the given value for the current,

is the set power value,

is the real-time voltage feedback value of the generator armature. 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, and the operating parameters are The set wind coefficient value, the induction parameter is the real-time voltage and current feedback value of the generator armature, the fixed parameter is the potential constant and the excitation magnetic flux of the generator, and the fan load calculation module performs the following process: According to the set wind coefficient value, the potential constant of the generator and the excitation magnetic flux and other parameters, the current adjustment given value is calculated by the current adjustment given value algorithm; According to the deviation of the current regulation given value and the real-time current feedback value of the generator armature, the required control current of the generator load circuit is calculated through the PI algorithm, and the required control current of the generator load circuit is converted into PWM The duty cycle output of the signal sent by the driver chip; The specific algorithm of the current regulation given value is:

, in,

is the set wind coefficient value,

is the potential constant of the generator,

is the excitation flux of the generator,

is the real-time voltage feedback value of the generator armature. 6. The multi-mode electronic torque load meter according to any one of claims 3-5, wherein the PI algorithm is specifically:

; in,

is the controlled current value of the generator load circuit,

to adjust the given value for the current,

is the real-time current feedback value of the generator armature,

is the preset proportional parameter of the PI error regulator,

Preset integral parameters for the PI error regulator. 7. The multi-mode electronic torque load meter according to any one of claims 1-5, wherein the human-computer interaction panel is also used for real-time display of measured and calculated parameter values, and the measured and calculated parameters include a generator load loop The torque value and the power value of the generator load circuit. 8 . The multi-mode electronic torque load meter 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 The measured parameter value is the torque value of the generator load circuit, the corresponding load calculation module is an energy consumption load calculation module, a torque load calculation module or a fan load calculation module, and the induction parameters are the real-time current of the generator armature and the voltage feedback value, the fixed parameters are the product value of the potential constant of the generator and the excitation magnetic flux, and the energy consumption load calculation module, the torque load calculation module or the fan load calculation module all also perform the following process: According to the real-time current feedback value of the generator armature, the potential constant of the generator and the excitation magnetic flux and other parameters, the torque value of the generator load circuit is calculated by the torque value algorithm of the generator load circuit; The torque value algorithm of the generator load circuit is specifically:

, in,

is the torque value of the generator load circuit,

is the real-time current feedback value of the generator armature,

is the potential constant of the generator,

is the excitation flux of the generator. 9 . The multi-mode electronic torque load meter according to claim 7 , wherein when the selected load mode is a power load mode, the measured parameter value displayed on the human-computer interaction panel is the power of the generator load circuit. 10 . value, the corresponding load calculation module is a 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 module also performs the following process : 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 of the generator load circuit is obtained by calculating the power value algorithm of the generator load circuit; The power value algorithm of the generator load circuit is specifically:

, in,

is the power value of the generator load circuit,

is the real-time voltage feedback value of the generator armature,

is the real-time current feedback value of the generator armature.

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