WO2021136348A1 - 电机平均电流平滑处理方法及系统、电机电流采样设备 - Google Patents

电机平均电流平滑处理方法及系统、电机电流采样设备 Download PDF

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WO2021136348A1
WO2021136348A1 PCT/CN2020/141261 CN2020141261W WO2021136348A1 WO 2021136348 A1 WO2021136348 A1 WO 2021136348A1 CN 2020141261 W CN2020141261 W CN 2020141261W WO 2021136348 A1 WO2021136348 A1 WO 2021136348A1
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current
motor
average
smoothing
average current
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PCT/CN2020/141261
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French (fr)
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朱志浩
黄迪
樊响
顾昕华
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沈机(上海)智能系统研发设计有限公司
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14Estimation or adaptation of machine parameters, e.g. flux, current or voltage
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/003Measuring mean values of current or voltage during a given time interval

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  • the present invention relates to the technical field of motor current, in particular to a method and system for smoothing the average current of a motor, and a motor current sampling device.
  • CNC machine tool is the abbreviation of computer numerical control machine tools (computer numerical control machine tools), which is an automated machine tool equipped with a program control system.
  • the control system can logically process a program with a control code or other symbolic instructions, decode it, express it with coded numbers, and input it into the numerical control device through an information carrier. After arithmetic processing, the numerical control device sends out various control signals to control the action of the machine tool, and automatically process the parts according to the shape and size required by the drawing.
  • the control system of a new generation of high-end CNC machine tools has the ability to connect to industrial cloud services. It has the ability to identify machine tool wear online and monitor changes in machine tool processing efficiency in conjunction with intelligent detection services and specific mathematical models running in the cloud.
  • the mathematical model obtains a physical result by comparing the continuous changes in the amplitude of the average current of the spindle/feed axis motor during similar processing performed by the machine tool, and requires the front-end sampling system to smoothly preprocess the collected average current of the motor.
  • FFT Fast Fourier Transform
  • wavelet-changed time-frequency domain round-trip transformation is usually used to achieve continuous smoothing of the output value of the current sampling system.
  • the above method requires a complicated high-order circuit filter to be arranged on the current sampling circuit system; and the filter time parameter adjustment range is relatively small.
  • the purpose of the present invention is to provide a method and system for smoothing the average current of a motor, and a motor current sampling device, which can quickly process the multiphase current collected from the motor and provide continuous and smooth motor current. average value.
  • the cumulative time parameter t s of the first-order system is an integer multiple of ⁇ .
  • the present invention provides a motor average current smoothing processing system, including an acquisition module and a processing module;
  • the acquisition module is used to acquire current parameters of the motor
  • the cumulative time parameter t s of the first-order system is an integer multiple of ⁇ .
  • the present invention provides a storage medium on which a computer program is stored, and when the program is executed by a processor, the above-mentioned motor average current smoothing processing method is realized.
  • the present invention provides a terminal, including: a processor and a memory;
  • the memory is used to store a computer program
  • the processor is configured to execute the computer program stored in the memory, so that the terminal executes the above-mentioned method for smoothing the average current of the motor.
  • the present invention provides a motor current sampling device, which includes a multi-phase synchronous sampling current sensor, a multi-channel synchronous sampling ADC circuit and a microprocessor;
  • the multi-phase synchronous sampling current sensor is used to synchronously collect and collect the analog current value of each phase
  • the multi-channel synchronous sampling ADC circuit is used for multi-channel synchronous sampling of the analog current value of each phase and converting it into a digital current value;
  • the microprocessor is used to obtain the average motor current based on the above-mentioned motor average current smoothing processing method based on the digital current value.
  • the microprocessor adopts an FPGA; the current sensor adopts a Hall sensor.
  • it further includes a bus interface circuit for outputting the average current of the motor.
  • the multi-phase synchronous sampling current sensor includes U-phase, V-phase and W-phase synchronous sampling current sensors.
  • the method and system for smoothing the average current of the motor, and the motor current sampling device of the present invention have the following beneficial effects:
  • FIG. 1 shows a flowchart of an embodiment of the smoothing processing method for the average current of a motor according to the present invention
  • FIG. 2 shows a time-domain diagram of current, excitation signal, and response signal in an embodiment of the smoothing processing method for the average current of the motor according to the present invention
  • FIG. 3 shows a schematic diagram of the structure of the motor average current smoothing system in an embodiment of the present invention
  • FIG. 4 shows a schematic diagram of the structure of the terminal of the present invention in an embodiment
  • FIG. 5 shows a schematic diagram of the structure of the motor current sampling device in an embodiment of the present invention
  • Fig. 6 is a schematic diagram of an application scenario of the motor current sampling device of the present invention in an embodiment
  • FIG. 7 shows a schematic diagram of internal logic of the microprocessor in an embodiment of the present invention.
  • Figure 8 shows a schematic diagram of the average current of the motor obtained according to the theoretical algorithm in the drilling operation of the machining center
  • Fig. 9 is a schematic diagram showing the average motor current obtained by performing the drilling operation of the machining center according to the motor average current smoothing method of the present invention.
  • the motor average current smoothing processing method and system and the motor current sampling device of the present invention can quickly process the multiphase current collected from the motor and provide a continuous and smooth average motor current. Meet the needs of practical applications.
  • T the motor current cycle
  • i m the peak current
  • the angular velocity of the motor rotor. Therefore, theoretically the average value of the motor current sampled value can be expressed as Among them, T is the motor current cycle, and Further, from the above formula we can know In the actual calculation process, T is the actual value provided by the CNC machine tool. Then, after every T period, a real number type calculation result will be generated But these There is no continuously changing correspondence between the data. When the motor speed is very slow (that is, the T value is large), it takes a long time to obtain a specific calculation result, and the data does not have continuity in theory.
  • the method for smoothing the average current of a motor of the present invention includes the following steps:
  • Step S1 Obtain current parameters of the motor.
  • the required current parameter is obtained from the parameters collected by the current parameter collecting device.
  • the current parameters at least include i m being the current peak value and ⁇ being the motor rotor angular velocity.
  • the S-domain transfer function of the first-order system in control theory can be expressed as Where ⁇ is an adjustable system constant.
  • the cumulative time parameter t s of the first-order system is an integer multiple of ⁇ .
  • the motor average current smoothing processing system of the present invention includes an acquisition module 31 and a processing module 32.
  • the acquisition module 31 is used to acquire the current parameters of the motor.
  • L -1 represents the anti-Laplace transform
  • i m is the current peak value
  • is the angular velocity of the motor rotor
  • is the adjustable system constant.
  • the cumulative time parameter t s of the first-order system is an integer multiple of ⁇ .
  • the division of the various modules of the above device is only a division of logical functions, and may be fully or partially integrated into a physical entity during actual implementation, or may be physically separated.
  • these modules can all be implemented in the form of software called by processing elements; they can also be implemented in the form of hardware; some modules can be implemented in the form of calling software by processing elements, and some of the modules can be implemented in the form of hardware.
  • the x module can be a separately established processing element, or it can be integrated into a chip of the above-mentioned device for implementation.
  • it can also be stored in the memory of the above-mentioned device in the form of program code. Call and execute the functions of the above x module.
  • each step of the above method or each of the above modules can be completed by an integrated logic circuit of hardware in the processor element or instructions in the form of software.
  • the above modules may be one or more integrated circuits configured to implement the above methods, for example: one or more application specific integrated circuits (ASICs for short), or one or more microprocessors ( Digital Singnal Processor, referred to as DSP), or, one or more Field Programmable Gate Array (Field Programmable Gate Array, referred to as FPGA), etc.
  • ASICs application specific integrated circuits
  • DSP Digital Singnal Processor
  • FPGA Field Programmable Gate Array
  • the processing element may be a general-purpose processor, such as a central processing unit (CPU for short) or other processors that can call program codes.
  • CPU central processing unit
  • these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC for short).
  • a computer program is stored on the storage medium of the present invention, and when the computer program is executed by a processor, the above-mentioned motor average current smoothing processing method is realized.
  • the storage medium includes: ROM, RAM, magnetic disk, U disk, memory card, or optical disk, etc., which can store program codes.
  • the terminal of the present invention includes: a processor 41 and a memory 42.
  • the memory 42 is used to store computer programs.
  • the memory 42 includes various media capable of storing program codes, such as ROM, RAM, magnetic disk, U disk, memory card, or optical disk.
  • the processor 41 is connected to the memory 42 and is configured to execute the computer program stored in the memory 42 so that the terminal executes the above-mentioned pedestrian attribute recognition method.
  • the processor 41 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU for short), a network processor (Network Processor, NP for short), etc.; it may also be a digital signal processor (Digital Signal Processor). , DSP for short), Application Specific Integrated Circuit (ASIC for short), Field Programmable Gate Array (FPGA for short) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • CPU Central Processing Unit
  • NP Network Processor
  • DSP Digital Signal Processor
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • the motor current sampling device of the present invention includes a multi-phase synchronous sampling current sensor 51, a multi-channel synchronous sampling ADC circuit 52 and a microprocessor 53.
  • the multi-phase synchronous sampling current sensor 51 is used to synchronously collect the analog current value of each phase.
  • the current sensor is a Hall sensor.
  • the multi-phase synchronous sampling current sensor includes U-phase, V-phase and W-phase synchronous sampling current sensors.
  • the multi-channel synchronous sampling ADC circuit 52 is connected to the multi-phase synchronous sampling current sensor 51, and is used for multi-channel synchronous sampling of the analog current value of each phase and converting it into a digital current value;
  • the microprocessor 53 is connected to the multi-channel synchronous sampling ADC circuit 52, and is used to obtain the average motor current based on the above-mentioned motor average current smoothing processing method based on the digital current value.
  • the microprocessor adopts FPGA.
  • the motor current sampling device of the present invention further includes a bus interface circuit 54 connected to the microprocessor 53 for outputting the average current of the motor.
  • FIG. 6 is a schematic diagram of an application scenario of the motor current sampling device of the present invention in an embodiment.
  • the microprocessor is responsible for digitally calculating and processing the original sampled data from the multi-channel synchronous sampling ADC circuit according to the motor average current smoothing method of the present invention to form a smooth average current value and send it to On the bus communication system.
  • the method for smoothing the average current of the motor of the present invention is optionally executed on the microprocessor, and the process is shown in FIG. 7.
  • Figure 8 shows a view of the direct calculation of the average current data according to the theoretical algorithm when the 3-axis vertical machining center performs continuous drilling. It can be intuitively felt that the value fluctuates greatly, and the specific process cannot be distinguished.
  • Figure 9 shows the data picture of the same machining center drilling operation performed after the microprocessing adopts the motor average current smoothing processing method of the present invention. It can be intuitively seen that the average current rises when the drilling operation is performed, and decreases when it exits. It intuitively reflects a complete drilling cycle.
  • the motor average current smoothing processing method and system, and the motor current sampling device of the present invention can quickly process the multiphase current collected from the motor to provide a continuous and smooth average value of the motor current; the calculation speed is fast and the resources are less occupied; No need for FFT or wavelet transformation, no need to arrange complex high-order circuit filters on the sampling circuit system; can provide a wide range of filter time parameter adjustment; the actual motor action process can be directly reflected by the smoothed data Come out; the obtained motor current average value is closer to the engineer’s intuitive experience and theoretical calculations, which is more convenient to use, and can provide a stable and clean data source for more complex and intelligent mathematical models. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial value.

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  • Control Of Electric Motors In General (AREA)

Abstract

一种电机平均电流平滑处理方法及系统、电机电流采样设备,该处理方法包括以下步骤:获取电机的电流参数(S1);基于所述电流参数根据L -1[C(S)]=L -1[R(S)•Φ(s)]计算电机平均电流(S2);其中L -1表示反拉普拉斯变换,R(s)=im(ω•coth(π•s/2ω)/(s22)),Φ(s)=1/(Γs+1),im为电流峰值,ω为电机转子角速度,Γ为可调节系统常数。该电机平均电流平滑处理方法及系统、电机电流采样设备能够快速地处理采集自电机的多相电流,提供连续平滑的电机电流平均值。

Description

电机平均电流平滑处理方法及系统、电机电流采样设备 技术领域
本发明涉及电机电流的技术领域,特别是涉及一种电机平均电流平滑处理方法及系统、电机电流采样设备。
背景技术
数控机床是数字控制机床(computer numerical control machine tools)的简称,是一种装有程序控制系统的自动化机床。该控制系统能够逻辑地处理具有控制编码或其他符号指令规定的程序,并将其译码,用代码化的数字表示,通过信息载体输入数控装置。经运算处理由数控装置发出各种控制信号,控制机床的动作,按图纸要求的形状和尺寸,自动地将零件加工出来。
新一代的高档数控机床的控制系统具有连接工业云服务的能力,其配合运行在云端的智能检测服务和特定的数学模型,具有在线辨识机床刀具磨损情况以及监测机床加工效率变化的能力。所述数学模型通过比对机床执行相似加工过程中主轴/进给轴电机平均电流的幅值连续变化得出物理结果,需要前端采样系统对于收集的电机平均电流进行平滑预处理。
现有技术中,通常采用快速傅里叶变换(Fast Fourier Transform,FFT)或者小波变化的时频域来回变换来实现电流采样系统输出值的连续平滑。然而,上述方法需要在电流采样电路系统上布置复杂的高阶电路滤波器;且滤波时间参数调节范围较小。
发明内容
鉴于以上所述现有技术的缺点,本发明的目的在于提供一种电机平均电流平滑处理方法及系统、电机电流采样设备,能够快速地处理采集自电机的多相电流,提供连续平滑的电机电流平均值。
为实现上述目的及其他相关目的,本发明提供一种电机平均电流平滑处理方法,包括以下步骤:获取电机的电流参数;基于所述电流参数根据L -1[C(S)]=L -1[R(S)·Φ(s)]计算电机平均电流;其中L -1表示反拉普拉斯变换,
Figure PCTCN2020141261-appb-000001
i m为电流峰值,ω为电机转子角速度,Γ为可调节系统常数。
于本发明一实施例中,一阶系统的累积时间参数t s为Γ的整数倍。
对应地,本发明提供一种电机平均电流平滑处理系统,包括获取模块和处理模块;
所述获取模块用于采集电机的电流参数;
所述处理模块用于基于所述电流参数根据L -1[C(S)]=L -1[R(S)·Φ(s)]计算电机平均电流;其中L -1表示反拉普拉斯变换,
Figure PCTCN2020141261-appb-000002
i m为电流峰值,ω为电机转子角速度,Γ为可调节系统常数。
于本发明一实施例中,一阶系统的累积时间参数t s为Γ的整数倍。
本发明提供一种存储介质,其上存储有计算机程序,该程序被处理器执行时实现上述的电机平均电流平滑处理方法。
本发明提供一种终端,包括:处理器及存储器;
所述存储器用于存储计算机程序;
所述处理器用于执行所述存储器存储的计算机程序,以使所述终端执行上述的电机平均电流平滑处理方法。
最后,本发明提供一种电机电流采样设备,包括多相同步采样电流传感器、多通道同步采样ADC电路和微处理器;
所述多相同步采样电流传感器用于同步采集采集各相的模拟电流值;
所述多通道同步采样ADC电路用于多通道同步采样各相位的模拟电流值,并转换为数字电流值;
所述微处理器用于基于所述数字电流值上述的电机平均电流平滑处理方法获取电机平均电流。
于本发明一实施例中,所述微处理器采用FPGA;所述电流传感器采用霍尔传感器。
于本发明一实施例中,还包括总线接口电路,用于输出所述电机平均电流。
于本发明一实施例中,所述多相同步采样电流传感器包括U相、V相和W相同步采样电流传感器。
如上所述,本发明的电机平均电流平滑处理方法及系统、电机电流采样设备,具有以下有益效果:
(1)能够快速地处理采集自电机的多相电流,提供连续平滑的电机电流平均值;
(2)运算速度快,占用资源少;
(3)不需要进行FFT或者小波变换,不需要在采样电路系统上布置复杂的高阶电路滤波器;
(4)能够提供宽泛的滤波时间参数调节范围;
(5)实际的电机动作过程可以正确的被平滑处理后的数据直接体现出来;所获取的电机电流平均值更加接近工程师的直观感受和理论计算,在使用上更加方便,可以给更加复杂和智能化的数学模型提供稳定且干净的数据源。
附图说明
图1显示为本发明的电机平均电流平滑处理方法于一实施例中的流程图;
图2显示为本发明的电机平均电流平滑处理方法于一实施例中电流、激励信号和响应信号的时域图;
图3显示为本发明的电机平均电流平滑处理系统于一实施例中的结构示意图;
图4显示为本发明的终端于一实施例中的结构示意图;
图5显示为本发明的电机电流采样设备于一实施例中的结构示意图;
图6显示为本发明的电机电流采样设备于一实施例中的应用场景示意图;
图7显示为本发明的微处理器于一实施例中的内部逻辑示意图;
图8显示为执行加工中心钻孔作业根据理论算法获取的电机平均电流的示意图;
图9显示为执行加工中心钻孔作业根据理论本发明的电机平均电流平滑处理方法获取的电机平均电流的示意图。
具体实施方式
以下通过特定的具体实例说明本发明的实施方式,本领域技术人员可由本说明书所揭露的内容轻易地了解本发明的其他优点与功效。本发明还可以通过另外不同的具体实施方式加以实施或应用,本说明书中的各项细节也可以基于不同观点与应用,在没有背离本发明的精神下进行各种修饰或改变。需说明的是,在不冲突的情况下,以下实施例及实施例中的特征可以相互组合。
需要说明的是,以下实施例中所提供的图示仅以示意方式说明本发明的基本构想,遂图式中仅显示与本发明中有关的组件而非按照实际实施时的组件数目、形状及尺寸绘制,其实际实施时各组件的型态、数量及比例可为一种随意的改变,且其组件布局型态也可能更为复杂。
本发明的电机平均电流平滑处理方法及系统、电机电流采样设备相较于现有技术中的电机电流均值算法,能够快速地处理采集自电机的多相电流,提供连续平滑的电机电流平均值,满足实际应用的需求。
电机电流可描述为i(t)=i m sin(ωt),其中,i m为电流峰值,ω为电机转子角速度。因此,理论上电机电流采样值的平均值可表示为
Figure PCTCN2020141261-appb-000003
其中,T为电机电流周期,且
Figure PCTCN2020141261-appb-000004
进一步地,由上述公式可知
Figure PCTCN2020141261-appb-000005
在实际计算过程中,T为数控机床提供的实际值。那么,每经过一个T周期就会产生一个实数类型的计算结果
Figure PCTCN2020141261-appb-000006
但是这些
Figure PCTCN2020141261-appb-000007
数据相互之间不存在连续变化的对应关系。当电机转速很慢(即T值很大)时,需要很长时间才能获得一个具体的计算结果,其数据在理论上不存在连续性。
如图1所示,于一实施例中,本发明的电机平均电流平滑处理方法包括以下步骤:
步骤S1、获取电机的电流参数。
具体地,在电机运行时,从电流参数采集设备采集的参数中获取所需的电流参数。其中,所述电流参数至少包括i m为电流峰值和ω为电机转子角速度。
步骤S2、基于所述电流参数根据L -1[C(S)]=L -1[R(S)·Φ(s)]计算电机平均电流;其中L -1表示反拉普拉斯变换,
Figure PCTCN2020141261-appb-000008
i m为电流峰值,ω为电机转子角速度,Γ为可调节系统常数。
具体地,控制理论中一阶系统的S域传递函数可表示为
Figure PCTCN2020141261-appb-000009
其中Γ为可调节系统常数。将电流i(t)=i m sin(ωt)进行绝对值处理后进行拉普拉斯变换,得到激励信号R(s),则可表示为
Figure PCTCN2020141261-appb-000010
相应地,激励信号R(s)的响应信号可表示为C(S)=R(S)·Φ(s)。
当同步电机工作在加工转速300rpm时i(t)=sin(10πt)且ω=10π,电流i(t)、激励信号R(s)和响应信号C(S)的时域图如图2所示。根据一阶系统时间域分析,s域内系统响应在经过反拉普拉斯变换后在数学上都是连续的。因此,在如图1中,虽然存在小幅度的波动,但是数值绘图的结果是完全平滑的。需要说明的是,上述波动与一阶系统中传递函数Φ(s)中Γ参数或/和激励信号中ω的大小有关,Γ或/和ω值增大后输出波形纹波减少,单独增加Γ值则一阶系统的累积时间参数t s有所加长。因此,可确定响应信号C(S)的稳态值(即L -1[C(s)]| ts)在激励信号R(S)已知的条件下是一个可以求取的确定值。故本发明根据L -1[C(S)]=L -1[R(S)·Φ(s)]计算电机平均电流。
于本发明一实施例中,一阶系统的累积时间参数t s为Γ的整数倍。
下面通过具体实施例来进一步说明本发明的电机平均电流平滑处理方法。
设定Γ=0.4s,t s=8Γ和13Γ,i m=[1,10]取整数,ω=10π,则电流为i(t)=i m sin(10πt),分别根据理论算法
Figure PCTCN2020141261-appb-000011
和本发明方法L -1[C(S)]=L -1[R(S)·Φ(s)]计算电机平均电流,计算结果如表1所示。
表1、采用理论算法和本发明算法获取的电机平均电流
Figure PCTCN2020141261-appb-000012
虽然上表只给出了给定转速ω=10π条件下i m取10个整数值以及t s取两个参数的计算结果,但是仍然可知一阶系统对于i(t)=i m sin(10πt)响应在时域结果的数值,与理论定义的平均电流直接计算结果误差非常小。例如,峰值电流i m=10Amp时相对误差最大为32mA,误差范围只有0.5%。只需要适当的调整一阶系统的累积时间参数t s的取值,即可保证最终的计算结果稳定的落在理论值I附近非常小的误差带内,从而充分验证了本发明的电机平均电流平滑处理方法。需要说明的是,Γ可用作系统的采样滤波时间参数且可以调节;t s可用作系统的数据刷新间隔参数且同样可以调节。
如图3所示,于一实施例中,本发明的电机平均电流平滑处理系统包括获取模块31和处理模块32。
所述获取模块31用于获取电机的电流参数。
所述处理模块32与所述获取模块31相连,用于基于所述电流参数根据L -1[C(S)]=L -1[R(S)·Φ(s)]计算电机平均电流;其中L -1表示反拉普拉斯变换,
Figure PCTCN2020141261-appb-000013
i m为电流峰值,ω为电机转子角速度,Γ为可调节系统常数。
于本发明一实施例中,一阶系统的累积时间参数t s为Γ的整数倍。
需要说明的是,获取模块31和处理模块32的结构和原理与上述电机平均电流平滑处理方法中的步骤一一对应,故在此不再赘述。
需要说明的是,应理解以上装置的各个模块的划分仅仅是一种逻辑功能的划分,实际实现时可以全部或部分集成到一个物理实体上,也可以物理上分开。且这些模块可以全部以软件通过处理元件调用的形式实现;也可以全部以硬件的形式实现;还可以部分模块通过处理元件调用软件的形式实现,部分模块通过硬件的形式实现。例如,x模块可以为单独设立的处理元件,也可以集成在上述装置的某一个芯片中实现,此外,也可以以程序代码的形式存储于上述装置的存储器中,由上述装置的某一个处理元件调用并执行以上x模块的功能。其它模块的实现与之类似。此外这些模块全部或部分可以集成在一起,也可以独立实现。这里所述的处理元件可以是一种集成电路,具有信号的处理能力。在实现过程中,上述方法的各步骤或以上各个模块可以通过处理器元件中的硬件的集成逻辑电路或者软件形式的指令完成。
例如,以上这些模块可以是被配置成实施以上方法的一个或多个集成电路,例如:一个或多个特定集成电路(Application Specific Integrated Circuit,简称ASIC),或,一个或多个微处理器(Digital Singnal Processor,简称DSP),或,一个或者多个现场可编程门阵列(Field Programmable Gate Array,简称FPGA)等。再如,当以上某个模块通过处理元件调度程序代码的形式实现时,该处理元件可以是通用处理器,例如中央处理器(Central Processing Unit,简称CPU)或其它可以调用程序代码的处理器。再如,这些模块可以集成在一起,以片上系统(system-on-a-chip,简称SOC)的形式实现。
本发明的存储介质上存储有计算机程序,该所述计算机程序被处理器执行时实现上述的电机平均电流平滑处理方法。优选地,所述存储介质包括:ROM、RAM、磁碟、U盘、存储卡或者光盘等各种可以存储程序代码的介质。
如图4所示,于一实施例中,本发明的终端包括:处理器41及存储器42。
所述存储器42用于存储计算机程序。
所述存储器42包括:ROM、RAM、磁碟、U盘、存储卡或者光盘等各种可以存储程序代码的介质。
所述处理器41与所述存储器42相连,用于执行所述存储器42存储的计算机程序,以使所述终端执行上述的行人属性识别方法。
优选地,所述处理器41可以是通用处理器,包括中央处理器(Central Processing Unit,简称CPU)、网络处理器(Network Processor,简称NP)等;还可以是数字信号处理器(Digital Signal Processor,简称DSP)、专用集成电路(Application Specific Integrated Circuit,简称ASIC)、现场可编程门阵列(Field Programmable Gate Array,简称FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。
如图5所示,本发明的电机电流采样设备包括多相同步采样电流传感器51、多通道同步采样ADC电路52和微处理器53。
所述多相同步采样电流传感器51用于同步采集采集各相的模拟电流值。于本发明一实施例中,所述电流传感器采用霍尔传感器。进一步地,所述多相同步采样电流传感器包括U相、V相和W相同步采样电流传感器。
所述多通道同步采样ADC电路52与所述多相同步采样电流传感器51相连,用于多通道同步采样各相位的模拟电流值,并转换为数字电流值;
所述微处理器53与所述多通道同步采样ADC电路52相连,用于基于所述数字电流值上述的电机平均电流平滑处理方法获取电机平均电流。于本发明一实施例中,所述微处理器采用FPGA。
于本发明一实施例中,本发明的电机电流采样设备还包括总线接口电路54,与所述微处理器53相连,用于输出所述电机平均电流。
图6显示为本发明的电机电流采样设备于一实施例中的应用场景示意图。在该应用场景下,所述微处理器负责将来自多通道同步采样ADC电路的原始采样数据根据本发明的电机平均电流平滑处理方法进行数字求取和处理,形成平滑的平均电流数值后送到总线通信系统上。其中,在所述微处理器上可选地执行本发明的电机平均电流平滑处理方法,其流程如图7所示。
下面通过具体实施例来验证本发明的电机电流采样设备的电流采样效果。图8所示为3轴立式加工中心进行连续钻孔加工时根据理论算法直接计算平均电流数据的图景,可以直观的感受到数值波动极大,无法分辨出具体的工艺过程。图9所示为微处理采用本发明的电机平均电流平滑处理方法后执行同样的加工中心钻孔作业的数据图景,可以直观的看到平均电 流在执行钻孔操作时上升,退出时下降,从而很直观的反映了一个完整的钻孔工作周期。
综上所述,本发明的电机平均电流平滑处理方法及系统、电机电流采样设备能够快速地处理采集自电机的多相电流,提供连续平滑的电机电流平均值;运算速度快,占用资源少;不需要进行FFT或者小波变换,不需要在采样电路系统上布置复杂的高阶电路滤波器;能够提供宽泛的滤波时间参数调节范围;实际的电机动作过程可以正确的被平滑处理后的数据直接体现出来;所获取的电机电流平均值更加接近工程师的直观感受和理论计算,在使用上更加方便,可以给更加复杂和智能化的数学模型提供稳定且干净的数据源。所以,本发明有效克服了现有技术中的种种缺点而具高度产业利用价值。
上述实施例仅例示性说明本发明的原理及其功效,而非用于限制本发明。任何熟悉此技术的人士皆可在不违背本发明的精神及范畴下,对上述实施例进行修饰或改变。因此,举凡所属技术领域中具有通常知识者在未脱离本发明所揭示的精神与技术思想下所完成的一切等效修饰或改变,仍应由本发明的权利要求所涵盖。

Claims (10)

  1. 一种电机平均电流平滑处理方法,其特征在于:包括以下步骤:
    获取电机的电流参数;
    基于所述电流参数根据L -1[C(S)]=L -1[R(S)·Φ(s)]计算电机平均电流;其中L -1表示反拉普拉斯变换,
    Figure PCTCN2020141261-appb-100001
    i m为电流峰值,ω为电机转子角速度,Γ为可调节系统常数。
  2. 根据权利要求1所述的电机平均电流平滑处理方法,其特征在于:一阶系统的累积时间参数t s为Γ的整数倍。
  3. 一种电机平均电流平滑处理系统,其特征在于:包括获取模块和处理模块;
    所述获取模块用于采集电机的电流参数;
    所述处理模块用于基于所述电流参数根据L -1[C(S)]=L -1[R(S)·Φ(s)]计算电机平均电流;其中L -1表示反拉普拉斯变换,
    Figure PCTCN2020141261-appb-100002
    i m为电流峰值,ω为电机转子角速度,Γ为可调节系统常数。
  4. 根据权利要求3所述的电机平均电流平滑处理系统,其特征在于:一阶系统的累积时间参数t s为Γ的整数倍。
  5. 一种存储介质,其上存储有计算机程序,其特征在于,该程序被处理器执行时实现权利要求1或2所述的电机平均电流平滑处理方法。
  6. 一种终端,其特征在于,包括:处理器及存储器;
    所述存储器用于存储计算机程序;
    所述处理器用于执行所述存储器存储的计算机程序,以使所述终端执行权利要求1或2所述的电机平均电流平滑处理方法。
  7. 一种电机电流采样设备,其特征在于:包括多相同步采样电流传感器、多通道同步采样ADC电路和微处理器;
    所述多相同步采样电流传感器用于同步采集采集各相的模拟电流值;
    所述多通道同步采样ADC电路用于多通道同步采样各相位的模拟电流值,并转换为数字电流值;
    所述微处理器用于基于所述数字电流值根据权利要求1或2所述的电机平均电流平滑处理方法获取电机平均电流。
  8. 根据权利要求7所述的电机电流采样设备,其特征在于:所述微处理器采用FPGA;所述电流传感器采用霍尔传感器。
  9. 根据权利要求7所述的电机电流采样设备,其特征在于:还包括总线接口电路,用于输出所述电机平均电流。
  10. 根据权利要求7所述的电机电流采样设备,其特征在于:所述多相同步采样电流传感器包括U相、V相和W相同步采样电流传感器。
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