Large-current output device for rotor direct-current resistance test

Abstract

A large current output device used for a rotor direct current resistance test comprises a feedback control module, a constant current source module and a current sensor. The plurality of constant current source modules are electrically connected with the plurality of current sensors respectively, and the plurality of constant current source modules and the plurality of current sensors are electrically connected with the feedback control module; and the plurality of constant current source modules are connected in parallel to form a loop to output 0-200A current at the output end. Voltage is adjusted through the feedback control module, so that the current value displayed by the current sensor meets one fourth of the target current, the stability of the current output in the rotor direct current resistance test is ensured, and the normal operation of the test is ensured; the current sensor can feed back the current value in real time to ensure stable current output and large current meeting the test requirement, potential safety hazards and test errors caused by unstable current output by the electric welding machine are avoided, and the test safety and the test accuracy are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of resistance testing, and relates to a high-current output device for rotor DC resistance testing. Background Technique

[0002] According to the industry standard DLT 845.3-2019 "General Technical Conditions for Resistance Measuring Devices - Part 3: DC Resistance Tester", measuring the rotor DC resistance test can detect defects such as wire breakage, de-soldering, poor soldering, and serious inter-turn short circuits during manufacturing, maintenance, or operation. When conducting the rotor DC resistance test, the output terminal of the DC resistance meter is connected to a resistive load to make the load current equal to the rated output current, and a standard ammeter is used to measure the current value at the output terminal. Among them, a 200A / 40V low-voltage DC power supply needs to be applied during the rotor DC resistance test. Currently, a welding machine is used to output a large current of 50A - 200A. However, the welding machine is easily damaged, resulting in unstable output current. This phenomenon not only increases the test risk coefficient but also reduces the work efficiency of the test personnel and affects the accuracy of the test results. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a high-current output device for rotor DC resistance testing, which adjusts the voltage through a feedback control module to make the current value displayed by the current sensor meet one-fourth of the target current, ensuring stable output current during the rotor DC resistance test and normal operation of the test.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is: a high-current output device for rotor DC resistance testing, which includes a feedback control module, a constant current source module, and a current sensor; multiple constant current source modules are electrically connected to multiple current sensors respectively, and multiple constant current source modules and multiple current sensors are all electrically connected to the feedback control module; multiple constant current source modules are connected in parallel to form a circuit to output a current of 0 - 200A at the output terminal.

[0005] The number of the constant current source modules is four; the current of each constant current source module is 50A.

[0006] The number of the current sensors is four, and each current sensor is correspondingly connected to a constant current source module.

[0007] Among the four current sensors, if the current value displayed by one of the current sensors does not meet one-fourth of the target current, the voltage is adjusted through the feedback control module to make the current value displayed by the current sensor meet one-fourth of the target current.

[0008] The main beneficial effects of the utility model are as follows:

[0009] It can feedback the current value through the current sensor in real time to ensure a large current with stable output and meeting the test requirements, avoid the unstable current output of the electric welding machine, thus bringing potential safety hazards and test errors, and improve the safety and accuracy of the test.

[0010] It can output any current from 0 to 200A, meet all the output current requirements of the rotor DC resistance test, and ensure the normal operation of the test.

[0011] The wiring is simple. Just adjusting the voltage signal of the feedback control module can meet the current requirements of the rotor DC resistance test, improving the work efficiency of the test personnel. Description of the Drawings

[0012] The following further describes the present utility model in conjunction with the drawings and embodiments.

[0013] Figure 1 It is a schematic structural diagram of the present utility model.

[0014] In the figure: feedback control module 1; constant current source module one 21; constant current source module two 22; constant current source module three 23; constant current source module four 24; current sensor one 31; current sensor two 32; current sensor three 33; current sensor four 34. Detailed Embodiment

[0015] As Figure 1 In, a large current output device for rotor DC resistance test includes a feedback control module 1, a constant current source module and a current sensor; multiple constant current source modules are electrically connected to multiple current sensors respectively, and multiple constant current source modules and multiple current sensors are all electrically connected to the feedback control module 1; multiple constant current source modules are connected in parallel to form a loop to output a current of 0 - 200A at the output end.

[0016] In a preferred solution, the number of the constant current source modules is four; the current of each constant current source module is 50A.

[0017] Preferably, the four constant current source modules are constant current source module one 21, constant current source module two 22, constant current source module three 23 and constant current source module four 24 respectively.

[0018] In a preferred solution, the number of the current sensors is four, and each current sensor is correspondingly connected to a constant current source module.

[0019] Preferably, the four current sensors are current sensor one 31, current sensor two 32, current sensor three 33 and current sensor four 34 respectively.

[0020] In a preferred solution, among the four current sensors, if the current value displayed by one of the current sensors does not meet one-fourth of the target current, the voltage is adjusted through the feedback control module 1 so that the current value displayed by the current sensor meets one-fourth of the target current.

[0021] Preferably, the output ends of the four 50A constant current source modules are connected in parallel, and a maximum of 200A / 40V current can be output. The feedback control module 1 controls the output of the constant current source according to the issued current value. The output current range is 0 - 200A, and the current output by each constant current source module is one-fourth of the target current. The feedback control module 1 is a 0 - 5V voltage value, corresponding to a current output of 0 - 50A. The feedback control module 1 can output an adjustable 0 - 5V voltage signal through a digital potentiometer. Connecting this voltage to the control pin of the constant current source can control the current output of the constant current source.

[0022] The current values displayed by the four current sensors are the same. If the current value displayed by one of the current sensors does not meet one-fourth of the target current, the voltage is adjusted through the feedback control module 1 so that the current value displayed by the current sensor meets one-fourth of the target current, which can ensure the stability of the output current during the rotor DC resistance test and ensure the normal operation of the test.

[0023] The feedback control module 1 can output an adjustable 0 - 5V voltage signal through a digital potentiometer. Connecting this voltage to the control pin of the constant current source can control the current output of the constant current source. If the current value displayed in the current sensor does not meet the rotor DC resistance test, the voltage signal of the feedback control module 1 in the device is increased or decreased to ensure that the current value of the current sensor meets the test requirements. Finally, the current output at the 0 - 200A output end of the device is the current that meets the test requirements. This output device can ensure the stability of the current output and the large current that meets the test requirements in real time by feeding back the current value through the current sensor, improving the work efficiency of the test personnel and the safety of the test.

[0024] Example 1

[0025] The 50A constant current source module 1 is connected to the current sensor 1 31 and then connected to the feedback control module 1. The 50A constant current source module 2 22 is connected to the current sensor 2 32 and then connected to the feedback control module 1. The 50A constant current source module 3 23 is connected to the current sensor 3 33 and then connected to the feedback control module 1. The 50A constant current source module 4 24 is connected to the current sensor 4 34 and then connected to the feedback control module 1. The 50A constant current source module 1, the 50A constant current source module 2 22, the 50A constant current source module 3 23, and the 50A constant current source module 4 24 are connected in parallel to form a loop, and finally a current of 0 - 200A is output at the 0 - 200A output end.

[0026] Connect the output terminals of the 50A constant current source module 1, 50A constant current source module 22, 50A constant current source module 23, and 50A constant current source module 24 in parallel, then the maximum output current can be 200A / 40V. The feedback control module 1 controls the output of the constant current source according to the issued current value, and the output current range is 0 - 200A. Then the current output by each constant current source module is one-fourth of the target current. The feedback control module 1 is a 0 - 5V voltage value, corresponding to a current output of 0 - 50A. The feedback control module 1 can output an adjustable 0 - 5V voltage signal through a digital potentiometer. Connecting this voltage to the control pin of the constant current source can control the current output of the constant current source. The current values displayed by the current sensor 1 31, current sensor 2 32, current sensor 3 33, and current sensor 4 34 are the same. If the current value displayed by one of the current sensors does not meet one-fourth of the target current, then the voltage is adjusted through the feedback control module 1 so that the current value displayed by the current sensor meets one-fourth of the target current, thus ensuring the stability of the output current in the rotor DC resistance test and ensuring the normal operation of the test.

[0027] Embodiment 2,

[0028] If a current of 100A needs to be output in the rotor DC resistance test, then it is necessary to control the 50A constant current source module 1, 50A constant current source module 22, 50A constant current source module 23, and 50A constant current source module 24 to each output a current value of 25A, so as to ensure that the total output after parallel connection is 100A. The feedback control module 1 can output an adjustable voltage signal of 2.5V through a digital potentiometer. If the current value displayed by one of the current sensors of the current sensor 1 31, current sensor 2 32, current sensor 3 33, and current sensor 4 34 is 25A, then it meets the requirement of outputting 100A current in the rotor DC resistance test, and the 0 - 200A output terminal in the device can output 100A current; if the current value displayed by one of the current sensors of the current sensor 1 31, current sensor 2 32, current sensor 3 33, and current sensor 4 34 is 26A, it may not meet the requirement of outputting 100A current in the rotor DC resistance test due to device errors. At this time, it is necessary to adjust the voltage signal in the feedback control module 1 to drop by 0.1V to a voltage value of 2.4V, ensuring that the current value displayed by one of the current sensors of the current sensor 1 31, current sensor 2 32, current sensor 3 33, and current sensor 4 34 is 25A, then it meets the requirement of outputting 100A current in the rotor DC resistance test, and the 0 - 200A output terminal in the device can output 100A current.

[0029] The above embodiments are only the preferred technical solutions of the present utility model and should not be regarded as limitations on the present utility model. The embodiments in this application and the features in the embodiments can be arbitrarily combined with each other without conflict. The protection scope of the present utility model should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present utility model.

Claims

1. A large current output device for rotor DC resistance test, characterized in that: It includes a feedback control module, a constant current source module, and a current sensor; multiple constant current source modules are electrically connected to multiple current sensors respectively, and multiple constant current source modules and multiple current sensors are all electrically connected to the feedback control module; multiple constant current source modules are connected in parallel to form a loop to output a current of 0 - 200A at the output end.

2. The high-current output device for rotor DC resistance test according to claim 1, wherein: The number of the constant current source modules is four; the current of each constant current source module is 50A.

3. The high-current output device for rotor DC resistance test according to claim 1, characterized in that: The number of the current sensors is four, and each current sensor is correspondingly connected to a constant current source module.

4. The high-current output device for rotor DC resistance test according to claim 3, wherein: Among the four current sensors, if the current value displayed by one of the current sensors does not meet one - quarter of the target current, the voltage is adjusted through the feedback control module to make the current value displayed by the current sensor meet one - quarter of the target current.

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