WO2018014753A1 - 电动机过载保护的调校方法和系统 - Google Patents
电动机过载保护的调校方法和系统 Download PDFInfo
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- WO2018014753A1 WO2018014753A1 PCT/CN2017/092421 CN2017092421W WO2018014753A1 WO 2018014753 A1 WO2018014753 A1 WO 2018014753A1 CN 2017092421 W CN2017092421 W CN 2017092421W WO 2018014753 A1 WO2018014753 A1 WO 2018014753A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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- the invention relates to the technical field of industrial control, in particular to a method and a system for adjusting the overload protection of a motor.
- the overload protection of the motor is generally realized by a thermal relay.
- the protection action threshold of the thermal relay is determined by the protection value knob of the thermal relay itself. For example, if the protection value knob of the thermal relay is selected at the A scale. Then, when the operating current of the motor is greater than A, the thermal relay will function and the control circuit will be disconnected, thereby realizing the protection of the motor.
- the problem is that although the protection value knob of the thermal relay has a scale, the technician does not easily set the precise protection value through the protection value knob. Therefore, the set protection value may be much larger than the actual working current of the motor. The value causes the thermal relay to not effectively protect the motor.
- the knob of the thermal relay is selected for one scale, it is basically no longer adjusted, and the demand for the protection threshold varies from the start to the normal operation of the motor, so the prior art does not fully meet the needs of the motor overload protection.
- the present invention aims to solve at least one of the above technical problems at least to some extent.
- a first object of the present invention is to provide a method of adjusting motor overload protection.
- the adjustment method realizes the automatic adjustment of the protection current, and thus can accurately protect the motor according to the adjusted protection current, reduce the damage of the motor due to overload, and improve work efficiency.
- a second object of the present invention is to provide a tuning system for motor overload protection.
- a third object of the present invention is to provide a storage medium.
- an embodiment of the first aspect of the present invention provides a method for adjusting a motor overload protection, the method comprising: collecting a working current of a motor in real time; determining a working current of the motor at each moment Whether the current difference between the corresponding initial protection currents satisfies a preset requirement; if it is determined that the current difference does not meet the preset requirement, the initial protection current that meets the preset requirement is adjusted to the initial The protection current is set.
- the calibration method of the embodiment of the present invention compares the actual working current of the motor with the initial protection current.
- the initial protection current is adjusted when the current difference between the working current and the corresponding initial protection current does not meet the preset requirement, thereby realizing automatic adjustment of the protection current, and thus the motor can be adjusted according to the adjusted protection current. Accurate overload protection, reduce the damage of the motor due to overload, and improve work efficiency.
- a second object of the present invention is to provide a motor overload protection calibration system comprising: a current collector and a PLC controller, wherein the current collector is coupled to the motor for real-time acquisition of the motor The working current is connected to the current collector; the PLC controller includes: a communication unit, configured to receive an operating current of the motor collected by the current collector in real time: a processing unit, The processing unit is connected to the communication unit, and is configured to determine whether a current difference between the working current of the motor at each moment and the corresponding initial protection current satisfies a preset requirement, and determine that the current difference occurs. When the preset requirement is met, the initial protection current that meets the preset requirement is adjusted to adjust the initial protection current; and the storage unit is connected to the processing unit for storing the initial protection Current.
- the calibration system in the embodiment of the present invention compares the actual working current of the motor with the initial protection current, and performs the initial protection current when the current difference between the actual working current and the corresponding initial protection current does not satisfy the preset requirement.
- the adjustment realizes the automatic adjustment of the protection current, and thus can accurately protect the motor according to the adjusted protection current, reduce the damage of the motor due to overload, and improve work efficiency.
- a third object of the present invention is to provide a storage medium for storing an application for performing a tuning method of the motor overload protection according to any of the above.
- FIG. 1 is a flow chart of a method of motor overload protection according to an embodiment of the present invention
- Figure 2 (a) is a schematic diagram showing the relationship between the actual operating current of the motor and the initial protection current before setting;
- Figure 2 (b) is a schematic diagram showing the relationship between the actual operating current of the motor and the set protection current
- FIG. 3 is a flow chart of a method for adjusting motor overload protection according to an embodiment of the present invention.
- FIG. 4 is a schematic structural view of a motor overload protection calibration system according to an embodiment of the present invention.
- Fig. 1 is a flow chart showing a method of adjusting motor overload protection according to an embodiment of the present invention.
- the method for adjusting the motor overload protection includes the following steps:
- the operating current of the motor is collected in real time by a current collector, wherein the current collector can be, for example, a multi-function meter.
- the current collector reports the operating current of the motor collected in real time to a PLC (Programmable Logic Controller).
- the initial protection current can be pre-stored in the PLC controller, that is, the uncorrected protection current stored in the PLC controller, the initial protection current is used to protect the motor when the operating current of the motor is greater than the initial protection current When the control circuit is disconnected, the protection of the motor is achieved.
- the PLC controller compares the actual working current of the motor collected in real time with the initial protection current, and determines whether the current difference between the actual working current at each moment and the initial protection current corresponding to the moment meets the preset requirement. Wherein, when the actual working current of the motor at each moment is less than the corresponding initial protection current and the current difference is in the preset current interval, it is determined that the current difference satisfies the preset requirement.
- the preset interval of the current difference is generally set to an overload margin of 10%, that is, the value of the protection current is increased by 10% compared with the value of the actual operating current of the motor.
- the PLC controller determines that the current difference between the actual working current and the initial protection current of the motor at some or some moments does not meet the preset requirement, adjust the corresponding protection current to make the current difference
- the initial protection current is set by meeting the preset requirements.
- the actual operating current and initial protection current of the motor at each moment are as shown in Fig. 2(a), and the actual operating current of the motor at the third second is 10A.
- the initial protection current is now 14A.
- the current difference between the actual operating current of the motor and the initial protection current is 4A, which is far more than 10% of the actual operating current 10A of the motor, that is, 1A, that is, the value of the initial protection current at this time is too high.
- the PLC controller adjusts the initial protection current 14A to adjust the protection current to 11A.
- the actual operating current of the motor is 5A, and the initial protection current is 5.1A.
- the difference between the actual operating current of the motor and the initial protection current is 0.1A, which is much smaller than
- the actual operating current of the motor is 10% of 10A, that is, 1A, that is, the value of the initial protection current at this time is too low, and the protection of the motor is not obtained. Therefore, the PLC controller adjusts the initial protection current 5.1A to adjust the protection current to 5.5A.
- the PLC controller can obtain the protection current after the setting as shown in Fig. 2(b), thereby ensuring the protection current after the PLC controller is set in the PLC controller. Accurate overload protection of the motor allows the motor to be well protected during operation.
- the calibration method of the embodiment of the present invention compares the actual working current of the motor with the initial protection current, and adjusts the initial protection current when the current difference between the actual working current and the corresponding initial protection current does not meet the preset requirement. Therefore, the automatic adjustment of the protection current is realized, and the motor can be accurately overloaded according to the adjusted protection current, thereby reducing the damage of the motor due to overload and improving the working efficiency.
- FIG. 3 is a flow chart of a method for adjusting motor overload protection according to an embodiment of the present invention.
- the motor overload protection calibration method includes:
- the PLC controller determines that the current difference between the actual working current of the motor at the current time and the initial protection current satisfies a preset requirement, that is, the actual operating current of the motor at the current time is less than the corresponding initial protection current and the current difference
- the initial protection current is not adjusted to keep the current initial current constant.
- the operating current and initial protection current of the motor are displayed.
- the technician can visually view the actual operating current and initial protection current of the motor on the current collector.
- the PLC controller can calculate the current difference between the actual working current of the motor and the initial protection current in real time, and send the current difference value to the current collector for display, so that the overload protection of the motor is visualized.
- the calibration method of the embodiment of the present invention keeps the current initial protection current unchanged when the current difference between the actual working current of the motor and the initial protection current satisfies the preset interval, and can be displayed in real time on the current collector.
- the actual working current of the motor and the initial protection current and the difference between the two, and then the motor is overload protected according to the current initial protection current, thereby achieving accurate overload protection of the motor and reducing the damage of the motor due to overload.
- the present invention also proposes a tuning system for motor overload protection.
- FIG. 4 is a schematic structural view of a motor overload protection calibration system according to an embodiment of the present invention.
- the motor overload protection calibration system includes a current collector 100 and a PLC controller 200.
- the PLC controller 200 includes a communication unit 210, a storage unit 220, and a processing unit 230.
- the current collector 100 is coupled to the motor for collecting the operating current of the motor in real time.
- the PLC controller 200 is connected to the current collector 100.
- the PLC controller 200 includes a communication unit 210, a storage unit 220, and a processing unit 230.
- the current collector 100 and the communication unit 210 can communicate using the RS485 communication protocol.
- the communication unit 210 is configured to receive an operating current of the motor collected by the current collector 100 in real time.
- the processing unit 230 is connected to the communication unit 210, and is configured to determine whether the current difference between the working current of the motor at each moment and the corresponding initial protection current satisfies a preset requirement, and determines that the current difference does not meet the preset requirement. In the case of the case, the initial protection current is adjusted to meet the preset requirement to set the initial protection current. The processing unit 230 is further configured to determine that the current difference meets a preset requirement when the operating current of the motor at each moment is less than the corresponding protection current and the current difference is in the preset current interval.
- the storage unit 220 is connected to the processing unit 230 for storing an initial protection current.
- the calibration system of the embodiment of the present invention compares the actual working current of the motor with the initial protection current, and adjusts the initial protection current when the current difference between the actual working current and the corresponding initial protection current does not meet the preset requirement. Therefore, the automatic adjustment of the protection current is realized, and the motor can be accurately overloaded according to the adjusted protection current, thereby reducing the damage of the motor due to overload and improving the working efficiency.
- the processing unit 230 is further configured to keep the current initial protection current unchanged when it is determined that the current difference between the operating current of the motor at each moment and the corresponding initial protection current meets the preset requirement. .
- the current collector 100 is also used to display the operating current of the motor and the initial protection current. Therefore, when it is judged that the current difference between the actual working current of the motor and the initial protection current satisfies the preset interval, the current initial protection current is kept unchanged, and the actual working current of the motor can be displayed in real time on the current collector.
- the initial protection current and the difference between the two, and then the motor is overload protected according to the current initial protection current, thereby achieving accurate overload protection of the motor and reducing the damage of the motor due to overload.
- the present invention also proposes a storage medium.
- the storage medium is for storing an application for performing a tuning method of the motor overload protection of any of the above.
- first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining “first” and “second” may be explicitly or implicitly The inclusion includes at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.
- the terms “installation”, “connected”, “connected”, “fixed” and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited.
- the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
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Abstract
一种电动机过载保护的调校方法和系统，该调校方法包括以下步骤：实时采集电动机的工作电流（S110）；判断电动机在每个时刻的工作电流与对应的初始保护电流之间的电流差值是否满足预设要求（S120）；如果判断电流差值出现未满足预设要求的情况，则调节为满足预设要求的初始保护电流，以对初始保护电流进行整定（S130）。该调校方法，实现了对保护电流的自动化调校，进而能够根据调校后的保护电流对电动机进行精确的过载保护，降低电动机因过载而损坏的情况，提升工作效率。
Description
相关申请的交叉引用
本申请要求中国恩菲工程技术有限公司于2016年7月22日提交的、发明名称为“电动机过载保护的调校方法和系统”的、中国专利申请号“201610585187.5”的优先权。
本发明涉及工业控制技术领域，特别涉及一种电动机过载保护的调校方法和系统。
目前，电动机的过载保护普遍是采用热继电器来实现的，其中热继电器的保护动作阈值是通过热继电器本身的保护值旋钮来实现的整定，例如，如果热继电器的保护值旋钮选定在A刻度，那么当电动机的工作电流大于A时，热继电器就会发挥作用，控制电路断开，从而实现对电动机的保护。但是存在的问题是，热继电器的保护值旋钮虽然具有刻度，但是技术人员并不容易通过保护值旋钮设定精确的保护值，因此，设定的保护值可能会远大于电动机的工作电流的实际值，导致热继电器并不能起到有效保护电动机的目的。此外，热继电器的旋钮选定一个刻度后，基本不再调整，而电动机从启动到正常工作整个过程中对保护阈值的需求是变化的，因此现有技术并没有完全满足电动机过载保护的需要。
发明内容
本发明旨在至少在一定程度上解决上述的技术问题之一。
为此，本发明的第一个目的在于提出了一种电动机过载保护的调校方法。该调校方法实现了对保护电流的自动化调校，进而能够根据调校后的保护电流对电动机进行精确的过载保护，降低电动机因过载而损坏的情况，提升工作效率。
本发明的第二个目的在于提出了一种电动机过载保护的调校系统。
本发明的第三个目的在于提出了一种存储介质。
为达上述目的，本发明第一方面的实施例提出了一种电动机过载保护的调校方法，该调校方法包括：实时采集电动机的工作电流；判断所述电动机在每个时刻的工作电流与对应的初始保护电流之间的电流差值是否满足预设要求；如果判断所述电流差值出现未满足预设要求的情况，则调节为满足预设要求的初始保护电流，以对所述初始保护电流进行整定。
本发明实施例的调校方法，将电动机的实际工作电流和初始保护电流进行比较，在实
际工作电流与对应的初始保护电流之间的电流差值不满足预设要求时对初始保护电流进行调整，从而实现了对保护电流的自动化调校，进而能够根据调校后的保护电流对电动机进行精确的过载保护，降低电动机因过载而损坏的情况，提升工作效率。
本发明的第二个目的在于提出了一种电动机过载保护的调校系统，包括：电流采集器和PLC控制器，其中，所述电流采集器与所述电动机相连，用于实时采集所述电动机的工作电流；所述PLC控制器与所述电流采集器相连，所述PLC控制器包括：通信单元，用于接收所述电流采集器实时采集的所述电动机的工作电流：处理单元，所述处理单元与所述通信单元相连，用于判断所述电动机在每个时刻的工作电流与对应的初始保护电流之间的电流差值是否满足预设要求，并在判断所述电流差值出现未满足预设要求的情况时，调节为满足预设要求的初始保护电流，以对所述初始保护电流进行整定；存储单元，所述存储单元与所述处理单元相连，用于存储所述初始保护电流。
本发明实施例中的调校系统，将电动机的实际工作电流和初始保护电流进行比较，在实际工作电流与对应的初始保护电流之间的电流差值不满足预设要求时对初始保护电流进行调整，从而实现了对保护电流的自动化调校，进而能够根据调校后的保护电流对电动机进行精确的过载保护，降低电动机因过载而损坏的情况，提升工作效率。
本发明的第三个目的在于提出了一种存储介质，用于存储应用程序，所述应用程序用于执行上述任一所述的电动机过载保护的调校方法。
本发明附加的方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。
本发明的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1是本发明一个实施例的电动机过载保护的方法的流程图；
图2(a)是电动机的实际工作电流和整定前的初始保护电流的关系的示意图；
图2(b)是电动机的实际工作电流和整定后的保护电流的关系的示意图；
图3是本发明一个具体实施例的电动机过载保护的调校方法的流程图；以及
图4是本发明的一个实施例的电动机过载保护的调校系统的结构示意图。
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描
述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。
下面参考附图描述本发明实施例的电动机过载保护的调校方法及系统。
图1是本发明一个实施例的电动机过载保护的调校方法的流程图。
如图1所示，该电动机过载保护的调校方法包括以下步骤：
S110，实时采集电动机的工作电流。
具体地，通过电流采集器实时采集电动机的工作电流，其中，电流采集器例如可以是多功能表。电流采集器将实时采集的电动机的工作电流上报至PLC(Programmable Logic Controller,可编程逻辑控制器)。
S120，判断电动机在每个时刻的工作电流与对应的初始保护电流之间的电流差值是否满足预设要求。
其中，初始保护电流可预先存储在PLC控制器中，即存储在PLC控制器中的未调校前的保护电流，该初始保护电流用于对电动机进行保护，当电动机的工作电流大于初始保护电流时，控制电路断开，从而实现对电动机的保护。
PLC控制器将实时采集的电动机的实际工作电流与初始保护电流进行比较，判断每个时刻的实际工作电流与该时刻对应的初始保护电流之间的电流差值是否满足预设要求。其中，当电动机在每个时刻的实际工作电流小于对应的初始保护电流且电流差值处于预设电流区间时，判断电流差值满足预设要求。
其中，上述电流差值的预设区间一般可设置为过载余量为10％，即保护电流的值比电动机的实际的工作电流的值提高10％。
S130，如果判断电流差值出现未满足预设要求的情况，则调节为满足预设要求的初始保护电流，以对初始保护电流进行整定。
具体地，如果PLC控制器判断电动机在某个或者某些时刻的实际工作电流与初始保护电流之间的电流差值出现未满足预设要求的情况，则调节相应的保护电流以使电流差值满足预设要求，从而对初始保护电流进行整定。
举例而言，在对电动机的初始保护电流整定前，电动机的在每个时刻的实际工作电流和初始保护电流如图2(a)所示，第3秒时电动机的实际工作电流为10A，而此时初始保护电流为14A。此时，电动机的实际工作电流与初始保护电流的电流差值为4A，远超过了电动机的实际工作电流10A的10％，即1A，也就是说，此时的初始保护电流的值过高，起不到对电动机的保护作用。因此PLC控制器对初始保护电流14A进行调整，将保护电流调整为11A。
再例如，如图2(a)所示，在第6秒时，电动机的实际工作电流为5A，而此时初始保护电流为5.1A。此时，电动机的实际工作电流与初始保护电流的电流差值为0.1A，远小于
电动机的实际工作电流10A的10％，即1A，也就是说，此时的初始保护电流的值过低，也起不到对电动机的保护作用。因此PLC控制器对初始保护电流5.1A进行调整，将保护电流调整为5.5A。
进而，PLC控制器在对初始保护电流进行调整后，可以得到如图2(b)所示的整定后的保护电流，从而确保PLC控制器在正式生产后，PLC控制器中整定后的保护电流可以对电动机进行精确的过载保护，使得电动机在运行过程中得到良好的保护效果。
本发明实施例的调校方法，将电动机的实际工作电流和初始保护电流进行比较，在实际工作电流与对应的初始保护电流之间的电流差值不满足预设要求时对初始保护电流进行调整，从而实现了对保护电流的自动化调校，进而能够根据调校后的保护电流对电动机进行精确的过载保护，降低电动机因过载而损坏的情况，提升工作效率。
图3为本发明一个具体实施例的电动机过载保护的调校方法的流程图。
如图3所示，该电动机过载保护的调校方法包括：
S310，实时采集电动机的工作电流。
S320，判断电动机在每个时刻的工作电流与对应的初始保护电流之间的电流差值是否满足预设要求。
S330，如果判断电流差值出现未满足预设要求的情况，则调节为满足预设要求的初始保护电流，以对初始保护电流进行整定。
S340，如果判断电动机在每个时刻的工作电流与对应的初始保护电流之间的电流差值满足预设要求，则保持当前初始保护电流不变。
具体地，如果PLC控制器判断电动机在当前时刻的实际工作电流与初始保护电流之间的电流差值满足预设要求，即电动机在当前时刻的实际工作电流小于对应的初始保护电流且电流差值处于预设电流区间时，则不对初始保护电流进行调整，保持当前初始电流的大小不变。
另外，在本发明的另一个实施例中，显示电动机的工作电流和初始保护电流。也就是说，技术人员可在电流采集器上直观的查看电动机的实际工作电流和初始保护电流。此外，PLC控制器可实时计算电动机的实际工作电流与初始保护电流之间的电流差值，并将该电流差值发送至电流采集器上进行显示，使得电动机的过载保护可视化。
本发明实施例的调校方法，在判断电动机的实际工作电流与初始保护电流之间的电流差值满足预设区间时，保持当前的初始保护电流不变，且在电流采集器上可以实时显示电动机的实际工作电流和初始保护电流以及二者的差值，进而根据当前的初始保护电流对电动机进行过载保护，从而实现了对电动机进行精确的过载保护，降低电动机因过载而损坏的情况发生。
为了实现上述实施例，本发明还提出了一种电动机过载保护的调校系统。
图4是本发明的一个实施例的电动机过载保护的调校系统的结构示意图。
如图4所示，该电动机过载保护的调校系统包括：电流采集器100和PLC控制器200。其中，PLC控制器200包括：通信单元210、存储单元220和处理单元230。
具体地，电流采集器100与电动机相连，用于实时采集电动机的工作电流。
PLC控制器200与电流采集器100相连，PLC控制器200包括通信单元210、存储单元220和处理单元230，其中，电流采集器100与通信单元210之间可以采用RS485通讯协议进行通讯。
通信单元210用于接收电流采集器100实时采集的电动机的工作电流。
处理单元230与通信单元210相连，用于判断电动机在每个时刻的工作电流与对应的初始保护电流之间的电流差值是否满足预设要求，并在判断电流差值出现未满足预设要求的情况时，调节为满足预设要求的初始保护电流，以对初始保护电流进行整定。其中，处理单元230还用于当电动机在每个时刻的工作电流小于对应的保护电流且电流差值处于预设电流区间时，判断电流差值满足预设要求。
存储单元220，与处理单元230相连，用于存储初始保护电流。
需要说明的是，前述对电动机过载保护的调校方法的实施例的解释说明也适用于该实施例的电动机过载保护的调校系统，其实现原理类似，此处不再赘述。
本发明实施例的调校系统，将电动机的实际工作电流和初始保护电流进行比较，在实际工作电流与对应的初始保护电流之间的电流差值不满足预设要求时对初始保护电流进行调整，从而实现了对保护电流的自动化调校，进而能够根据调校后的保护电流对电动机进行精确的过载保护，降低电动机因过载而损坏的情况，提升工作效率。
在本发明的一个实施例中，处理单元230还用于当判断电动机在每个时刻的工作电流与对应的初始保护电流之间的电流差值满足预设要求时，保持当前初始保护电流不变。电流采集器100还用于显示电动机的工作电流和初始保护电流。由此，在判断电动机的实际工作电流与初始保护电流之间的电流差值满足预设区间时，保持当前的初始保护电流不变，且在电流采集器上可以实时显示电动机的实际工作电流和初始保护电流以及二者的差值，进而根据当前的初始保护电流对电动机进行过载保护，从而实现了对电动机进行精确的过载保护，降低电动机因过载而损坏的情况发生。
为了实现上述实施例，本发明还提出了一种存储介质。该存储介质用于存储应用程序，所述应用程序用于执行上述任一所述的电动机过载保护的调校方法。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐
含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。
Claims (10)
- 一种电动机过载保护的调校方法，其特征在于，包括以下步骤：实时采集电动机的工作电流；判断所述电动机在每个时刻的工作电流与对应的初始保护电流之间的电流差值是否满足预设要求；如果判断所述电流差值出现未满足预设要求的情况，则调节为满足预设要求的初始保护电流，以对所述初始保护电流进行整定。
- 根据权利要求1所述的调校方法，其特征在于，如果判断所述电动机在每个时刻的工作电流与对应的初始保护电流之间的电流差值满足预设要求，则保持当前初始保护电流不变。
- 根据权利要求1或2所述的调校方法，其特征在于，显示所述电动机的工作电流和所述初始保护电流。
- 根据权利要求1所述的调校方法，其特征在于，当所述电动机在每个时刻的工作电流小于对应的初始保护电流且所述电流差值处于预设电流区间时，判断所述电流差值满足所述预设要求。
- 一种电动机过载保护的调校系统，其特征在于，包括：电流采集器和PLC控制器，其中，所述电流采集器与所述电动机相连，用于实时采集所述电动机的工作电流；所述PLC控制器与所述电流采集器相连，所述PLC控制器包括：通信单元，用于接收所述电流采集器实时采集的所述电动机的工作电流：处理单元，所述处理单元与所述通信单元相连，用于判断所述电动机在每个时刻的工作电流与对应的初始保护电流之间的电流差值是否满足预设要求，并在判断所述电流差值出现未满足预设要求的情况时，调节为满足预设要求的初始保护电流，以对所述初始保护电流进行整定；存储单元，所述存储单元与所述处理单元相连，用于存储所述初始保护电流。
- 根据权利要求5所述的调校系统，其特征在于，所述处理单元还用于：当判断所述电动机在每个时刻的工作电流与对应的初始保护电流之间的电流差值满足预设要求时，保持当前初始保护电流不变。
- 根据权利要求5或6所述的调校系统，其特征在于，所述电流采集器还用于：显示所述电动机的工作电流和所述初始保护电流。
- 根据权利要求5所述的调校系统，其特征在于，所述处理单元还用于：当所述电动机在每个时刻的工作电流小于对应的保护电流且所述电流差值处于预设电流区间时，判断所述电流差值满足所述预设要求。
- 根据权利要求5所述的调校系统，其特征在于，所述电流采集器与所述通信单元之间采用RS485通讯协议进行通讯。
- 一种存储介质，其特征在于，用于存储应用程序，所述应用程序用于执行如权利要求1至4中任一项所述的电动机过载保护的调校方法。
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| CN106026025A (zh) * | 2016-07-22 | 2016-10-12 | 中国恩菲工程技术有限公司 | 电动机过载保护的调校方法和系统 |
| CN205901269U (zh) * | 2016-07-22 | 2017-01-18 | 中国恩菲工程技术有限公司 | 电动机过载保护的调校系统 |
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| US20060250154A1 (en) * | 2005-05-09 | 2006-11-09 | Square D Company | Electronic overload relay for mains-fed induction motors |
| CN101202185A (zh) * | 2006-12-12 | 2008-06-18 | 张世兴 | 智慧安防断路器 |
| CN101777754A (zh) * | 2009-01-09 | 2010-07-14 | 比亚迪股份有限公司 | 一种电机运行过载保护的方法 |
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