Device and method for detecting polarity of electric motor coils

Abstract

A device and method for detecting the polarity of electric motor coils. The device comprises an insulating housing (10), a direct-current power supply (20), an inching switch (30) and a light-emitting diode (40), wherein the insulating housing (10) is provided with first, second, third and fourth wiring sockets (51, 52, 53, 54); the direct-current power supply (20) and the inching switch (30) are connected in series to form a first detection loop (L1); two ends of the first detection loop (L1) are respectively connected to the first and second wiring sockets (51, 52); two ends of the light-emitting diode (40) are respectively connected to the third and fourth wiring sockets (53, 54); the first and second wiring sockets (51, 52) are respectively configured to connect two ends of an excitation coil (C1); and the third and fourth wiring sockets (53, 54) are respectively configured to connect two ends of a coil (C2) to be tested. The device simplifies test operations, makes detection results more intuitive, and improves the efficiency and convenience of coil polarity detection.

Description

A device and method for detecting the polarity of an electric motor coil Technical Field

[0001] The embodiments disclosed herein belong to the field of electric motor coil polarity detection technology, specifically relating to an electric motor coil polarity detection device and method. Background Technology

[0002] When the end leads of field equipment such as three-phase motors and DC motors are removed, it is sometimes impossible to determine the polarity of the start and end points of the motor coils due to unclear markings. If the start and end points of the coils are connected incorrectly, the motor will fail to start due to the different magnetic field forces. Therefore, it is essential to perform polarity testing on disassembled and repaired motors to confirm their correctness.

[0003] Currently, when measuring the polarity of motor coils on-site, the traditional test method of using a potassium battery power supply, a milliammeter, and an external connection to perform a jogging test, and judging the polarity by the swing of the milliammeter needle, is used.

[0004] Existing testing methods are based on the principle of electromagnetic induction and use the most basic loose component wiring method for testing. This is a basic application of traditional testing methods, and the components at the test site are scattered.

[0005] The experimental procedure is cumbersome, and the polarity judgment based on the swing of the pointer is not intuitive enough. Summary of the Invention

[0006] The embodiments disclosed herein aim to at least solve one of the technical problems existing in the prior art, and provide a device and method for detecting the polarity of an electric motor coil.

[0007] One aspect of this disclosure provides a motor coil polarity detection device, the device comprising an insulating housing, a DC power supply, a jog switch, and a light-emitting diode;

[0008] The insulating housing is provided with a first wiring socket, a second wiring socket, a third wiring socket, and a fourth wiring socket; the DC power supply, the jog switch, and the light-emitting diode are all disposed inside the insulating housing;

[0009] The DC power supply and the jog switch are connected in series to form the first detection circuit;

[0010] The two ends of the first detection circuit are respectively connected to the first wiring socket and the second wiring socket; the two ends of the light-emitting diode are respectively connected to the third wiring socket and the fourth wiring socket.

[0011] The first and second wiring ports are used to connect the two ends of the excitation coil, respectively; the third and fourth wiring ports are used to connect the two ends of the coil under test, respectively.

[0012] Furthermore, the first end of the jog switch is connected to the first wiring socket, and the second end of the jog switch is connected to the positive terminal of the DC power supply;

[0013] The negative terminal of the DC power supply is connected to the second wiring socket.

[0014] Optionally, a detection button is also provided on the insulating housing;

[0015] The detection button is connected to the jog switch, and the detection button is used to control the jog switch to open or close.

[0016] Optionally, the DC power source is a lithium battery.

[0017] Furthermore, the device also includes a current-limiting resistor; the current-limiting resistor is connected in series with the light-emitting diode to form a second detection circuit;

[0018] The two ends of the second detection circuit are respectively connected to the third wiring socket and the fourth wiring socket.

[0019] Furthermore, the first end of the current-limiting resistor is connected to the third wiring socket, and the second end of the current-limiting resistor is connected to the positive terminal of the light-emitting diode;

[0020] The negative terminal of the light-emitting diode is connected to the fourth wiring socket.

[0021] Another aspect of this disclosure provides a method for detecting the polarity of a motor coil, based on the motor coil polarity detection device described above, the method comprising:

[0022] Provide excitation coil and coil under test;

[0023] Connect the two ends of the excitation coil to the first wiring socket and the second wiring socket respectively;

[0024] Connect the two ends of the coil to be tested to the third wiring socket and the fourth wiring socket respectively;

[0025] Close the jog switch and detect the polarity of the coil under test based on the working state of the light-emitting diode.

[0026] Further, determining the polarity of the coil under test based on the operating state of the light-emitting diode includes:

[0027] If the LED is lit, it is determined that the polarity of the coil under test is the same as that of the excitation coil; if the LED is not lit, it is determined that the polarity of the coil under test is opposite to that of the excitation coil.

[0028] This disclosure discloses a motor coil polarity detection device and method, which uses a light-emitting diode as an indicating instrument and integrates various test devices into an insulating housing. This transforms the cumbersome test wiring into an integrated motor coil polarity detection device, simplifying the test operation, making the test results more intuitive, and increasing the efficiency and convenience of motor coil polarity detection. Attached Figure Description

[0029] Figure 1 is a schematic diagram of the structure of a motor coil polarity detection device according to an embodiment of the present disclosure;

[0030] Figure 2 is a flowchart illustrating a method for detecting the polarity of an electric motor coil according to another embodiment of this disclosure. Detailed Implementation

[0031] The coils inside an electric motor are usually arranged closely together. One of two adjacent or close coils is used as the excitation coil, and the other is used as the coil under test. When an external DC power supply is applied to the ends of the excitation coil, the coil under test will generate a current in the same direction due to electromagnetic induction. At this point, the positive and negative terminals of the coil under test can be determined. Based on this principle, it can be determined whether the start and end connections of the coils inside the motor are correct.

[0032] In existing motor coil polarity tests, various testing devices such as DC power supplies and milliammeters are used as basic components for test wiring. When polarity testing is required for multiple sets of coils, frequent disconnection and relocation of multiple devices are necessary, which greatly increases the time and complexity of the test, resulting in low test efficiency.

[0033] To address the aforementioned technical problems, the embodiments of this disclosure integrate various testing devices into an insulation test box to form a unified motor coil polarity detection device, simplifying the testing operation and increasing the testing efficiency.

[0034] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this disclosure.

[0035] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0036] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0037] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Therefore, the first component discussed below may be referred to as the second component without departing from the teachings of this disclosure. As used in this disclosure, the term "and / or" includes all combinations of any and more of the associated listed items.

[0038] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing this disclosure, and therefore cannot be used to limit the scope of protection of this disclosure.

[0039] As shown in Figure 1, one embodiment of this disclosure provides a motor coil polarity detection device, including an insulating housing 10, a DC power supply 20, a jog switch 30, and a light-emitting diode 40. The insulating housing 1 is respectively provided with a first wiring socket 51, a second wiring socket 52, a third wiring socket 53, and a fourth wiring socket 54. The DC power supply 20, the jog switch 30, and the light-emitting diode 40 are all disposed inside the insulating housing 10. The DC power supply 20 and the jog switch 30 are connected in series to form a first detection circuit L1. The two ends of the first detection circuit L1 are respectively connected to the first wiring socket 51 and the second wiring socket 52. The two ends of the light-emitting diode 40 are respectively connected to the third wiring socket 53 and the fourth wiring socket 54. The first wiring socket 51 and the second wiring socket 52 are respectively used to connect to the two ends of the excitation coil; the third wiring socket 53 and the fourth wiring socket 54 are respectively used to connect to the two ends of the coil under test.

[0040] Specifically, the first end of the jog switch 30 is connected to the first wiring socket 51, the second end of the jog switch 30 is connected to the positive terminal of the DC power supply 20, and the negative terminal of the DC power supply 20 is connected to the second wiring socket 52. Thus, the first wiring socket 51 on the insulating housing 10 is configured as the positive terminal, and the second wiring socket 52 is configured as the negative terminal. Each wiring socket can use dedicated test leads to bring out test terminals or test clips, facilitating flexible connection to the corresponding excitation coils and the coil under test. The DC power supply 20 uses a lithium battery, which has a larger capacity than the potassium batteries currently used in motor coil polarity testing, making the device more durable, eliminating the need for frequent charging, and increasing convenience.

[0041] For example, as shown in FIG1, a detection button 60 is also provided on the insulating housing 10. The detection button 60 is connected to the jog switch 30, and the detection button 60 is used to control the jog switch 30 to open or close.

[0042] Specifically, the jog switch 30 can be a spring-reset switch, and the detection button 60 is linked with the jog switch 30 to form a trigger-type test button. When the detection button 60 is pressed, the jog switch 30 closes, and the first detection circuit L1 is turned on; after the detection button 60 is released, the jog switch 30 resets, thereby disconnecting the first detection circuit L1.

[0043] For example, as shown in FIG1, the device further includes a current-limiting resistor 70. The current-limiting resistor 70 is connected in series with the light-emitting diode 40 to form a second detection circuit L2. The two ends of the second detection circuit L2 are respectively connected to the third wiring socket 53 and the fourth wiring socket 54.

[0044] Specifically, the resistance value of the current-limiting resistor 70 can be set according to the magnitude of the output current of the DC power supply 20 and the resistance value of the coil, etc., to protect the light-emitting diode 40 from being damaged by the impact of a large current.

[0045] For example, as shown in Figure 1, the first end of the current-limiting resistor 70 is connected to the third wiring socket 53, the second end of the current-limiting resistor 70 is connected to the positive terminal of the light-emitting diode 40, and the negative terminal of the light-emitting diode 40 is connected to the fourth wiring socket 54. When the induced current flows in from the third wiring socket 53, passes through the current-limiting resistor 70, and flows into the positive terminal of the light-emitting diode 40, the light-emitting diode 40 lights up; however, when the induced current flows into the negative terminal of the light-emitting diode 40 from the fourth wiring socket 54, it does not light up. This allows the detection of the polarity of the two ends of the coil under test connected to the third wiring socket 53 and the fourth wiring socket 54, thereby determining whether the coil under test is installed correctly.

[0046] This disclosure discloses a motor coil polarity detection device that uses a light-emitting diode as an indicating instrument and integrates various test devices into an insulating housing. This transforms the cumbersome test wiring into an integrated motor coil polarity detection device, simplifying the test operation, making the test results more intuitive, and increasing the efficiency and convenience of motor coil polarity detection.

[0047] As shown in Figure 2, another embodiment of this disclosure provides a method for detecting the polarity of a motor coil, based on the motor coil polarity detection device described in the previous embodiment. The method includes:

[0048] Step S1: Provide an excitation coil and a coil under test.

[0049] Specifically, the coils inside the electric motor are usually arranged closely together. In the coil polarity detection test based on the principle of electromagnetic induction, one of two adjacent or close coils can be used as the excitation coil, and the other coil can be used as the coil under test. The distance between the two coils needs to be sufficient to generate a certain induced current through electromagnetic induction to drive the indicating meter used to determine whether the polarities of the two coils are consistent.

[0050] Step S2: Connect the two ends of the excitation coil to the first wiring socket and the second wiring socket, respectively.

[0051] Specifically, referring to Figure 1, test wires are led out from the first wiring socket 51 and the second wiring socket 52 of the motor coil polarity detection device, and connected to the two ends of the excitation coil C1 respectively. When the positive terminal of the DC power supply 20 is connected to the first wiring socket 51 and the negative terminal is connected to the second wiring socket 52, and the excitation coil C1 is energized, the end of the excitation coil C1 connected to the first wiring socket 51 is the positive terminal, and the end connected to the second wiring socket 52 is the negative terminal.

[0052] Step S3: Connect the two ends of the coil to be tested to the third wiring socket and the fourth wiring socket respectively.

[0053] Specifically, referring to Figure 1, when the positive terminal of the light-emitting diode 40 is connected to the third wiring socket 53 and its negative terminal is connected to the fourth wiring socket 54, a test connector or connector is led out from the third wiring socket 53 and connected to the end of the coil under test C2 that should theoretically be the positive terminal, and a test connector or connector is led out from the fourth wiring socket 54 and connected to the end of the coil under test C2 that should theoretically be the negative terminal.

[0054] Step S4: Close the jog switch and detect the polarity of the coil under test according to the working state of the light-emitting diode.

[0055] Specifically, referring to Figure 1, the jog switch 30 can be a spring reset switch. When the jog switch 30 is pressed to close it, according to the wiring done in the previous step S3, if the light-emitting diode 40 lights up, it is determined that the polarity of the coil under test C2 is the same as that of the excitation coil C1; if the light-emitting diode 40 does not light up, it is determined that the polarity of the coil under test C2 is opposite to that of the excitation coil C1.

[0056] Understandably, the judgment made based on the working state of the LED to determine the polarity of the coil under test should be determined according to the specific wiring situation in the device. If any of the following situations occur: the DC power supply 20 in step S2 is reversed, the LED 40 in step S3 is reversed, the wiring at both ends of the excitation coil C1 is swapped, or the wiring at both ends of the coil under test C2 is swapped, then the above judgment process should be changed to: if the LED lights up, then the polarity of the coil under test is determined to be opposite to that of the excitation coil; if the LED does not light up, then the polarity of the coil under test is determined to be the same as that of the excitation coil.

[0057] This disclosure discloses a method for detecting the polarity of a motor coil, which uses a light-emitting diode as an indicating instrument and integrates various test devices into an insulating housing. This transforms the cumbersome test wiring into an integrated motor coil polarity detection device, simplifying the test operation, making the test results more intuitive, and increasing the efficiency and convenience of motor coil polarity detection.

[0058] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. An electric motor coil polarity detection apparatus, characterized by, The device comprises an insulating shell, a direct current power supply, a jog switch and a light emitting diode; The insulating shell is respectively provided with a first wiring socket, a second wiring socket, a third wiring socket and a fourth wiring socket; the direct current power supply, the jog switch and the light emitting diode are arranged inside the insulating shell; The direct current power supply and the jog switch are connected in series to form a first detection circuit; Two ends of the first detection circuit are respectively connected with the first wiring socket and the second wiring socket; two ends of the light emitting diode are respectively connected with the third wiring socket and the fourth wiring socket; The first wiring socket and the second wiring socket are respectively used for connecting two ends of an excitation coil; the third wiring socket and the fourth wiring socket are respectively used for connecting two ends of a coil to be detected.

2. The motor coil polarity detection apparatus of claim 1, wherein A first end of the jog switch is connected with the first wiring socket, and a second end of the jog switch is connected with a positive electrode of the direct current power supply; A negative electrode of the direct current power supply is connected with the second wiring socket.

3. The motor coil polarity detection apparatus of claim 1, wherein The insulating shell is further provided with a detection button; The detection button is connected with the jog switch, and the detection button is used for controlling the jog switch to be opened or closed.

4. The motor coil polarity detection apparatus according to any one of claims 1 to 3, characterized by The direct current power supply is a lithium battery.

5. The motor coil polarity detection apparatus according to any one of claims 1 to 3, characterized by The device further comprises a current limiting resistor; the current limiting resistor and the light emitting diode are connected in series to form a second detection circuit; Two ends of the second detection circuit are respectively connected with the third wiring socket and the fourth wiring socket.

6. The motor coil polarity detection apparatus of claim 5, wherein A first end of the current limiting resistor is connected with the third wiring socket, and a second end of the current limiting resistor is connected with a positive electrode of the light emitting diode; A negative electrode of the light emitting diode is connected with the fourth wiring socket.

7. A method for detecting polarity of a motor coil, based on the motor coil polarity detection device according to any one of claims 1 to 6, characterized in that, The method comprises: Providing an excitation coil and a coil to be detected; Connecting two ends of the excitation coil with the first wiring socket and the second wiring socket respectively; Connecting two ends of the coil to be detected with the third wiring socket and the fourth wiring socket respectively; Closing the jog switch, and detecting the polarity of the coil to be detected according to the working state of the light emitting diode.

8. The motor coil polarity detection method of claim 7, wherein, The method for detecting the polarity of the coil to be detected according to the working state of the light emitting diode comprises: If the light emitting diode is on, it is determined that the polarity of the coil to be detected is consistent with the excitation coil; if the light emitting diode is not on, it is determined that the polarity of the coil to be detected is opposite to the excitation coil.

Images