Motor polarity tester

Abstract

The utility model relates to the technical field of motor polarity testing, and discloses a motor polarity tester, which comprises a direct current power supply, a fuse, a first group of single-gear switches, a second group of single-gear switches, an ampere meter, a signal lamp, two-gear toggle switches and a binding post, and the two-gear toggle switches are respectively S1 and S2. According to the utility model, instruments, meters, various elements and connecting wires required by a traditional motor polarity judgment method are scientifically integrated to form an instrument which is complete in function, convenient to carry and simple to operate, the instrument has three functions of winding search, polarity verification and polarity identification of the motor, the winding search is carried out by adopting a power supply and a light-emitting diode, and the reliability of the motor is improved. Compared with the prior art, the motor polarity testing device has the advantages that instruments used for motor testing are optimized, polarity testing operation steps are simplified, motor polarity testing can be completed in a one-stop mode, and the motor polarity testing device has obvious advancement, scientificity, practicability and generalization in terms of the whole principle and structure.

Description

Technical Field

[0001] This utility model relates to the field of motor polarity testing technology, and in particular to a motor polarity tester. Background Technology

[0002] Motor polarity refers to the correct marking of the beginning and end of the leads of the motor windings (3 pairs of windings, six terminals). Incorrect polarity can cause abnormal rotating magnetic fields in the motor, leading to abnormal operating current, high energy consumption, low efficiency, and significantly shortening the service life of electrical equipment and motors. There are many methods for testing motor winding polarity, each using different power supplies, instruments, and operating procedures. These methods are usually selected by professional technicians based on their own capabilities. According to surveys, there are currently no complete sets of instruments for testing motor winding polarity on the domestic and international markets.

[0003] Patent CN203941259U proposes an adjustable voltage motor winding polarity discrimination device, which can detect polarity. However, it uses a 24V power supply, voltage divider resistors, DC relays, indicator lights, and various switching components, making it relatively complex with two sets of testing equipment and instruments. The concept of "short-time power-on" is a misconception; the signal is not "short-time" but "instantaneous." If the instantaneous signal is insufficient to complete signal conversion and indication, the detection performance will be unstable. Patent CN201867462U proposes a winding polarity testing device, which can also detect polarity. However, it uses AC power plus a transformer, rectifier, and DC power supply, i.e., dual power supply. It can only complete a 1:2 or 1:3 polarity test in one go, requiring two disconnections and reconnections. The device is cumbersome, has poor stability, and a high error rate.

[0004] Therefore, there is an urgent need to develop a motor polarity tester that is simple in structure and operation and easy to promote. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a motor polarity tester.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a motor polarity tester, the tester comprising a DC power supply, a fuse, a first set of single-position switches, a second set of single-position switches, an ammeter, an indicator light, a two-position toggle switch and terminals, wherein there are two two-position toggle switches, namely S1 and S2.

[0007] The first set of single-position switches, terminals, indicator lights, fuses, S1, DC power supply and the three windings of the motor are connected to form a winding search circuit;

[0008] The second set of single-position switches, S1, S2, fuse, DC power supply, ammeter and the three windings of the motor are connected to form two sets of polarity verification circuits. The two sets of polarity verification circuits are used to verify the U and V phase polarity of the motor windings and the U and W phase polarity of the motor windings, respectively.

[0009] Preferably, when S1 of the two-position toggle switch is placed on the left, the winding search circuit is activated; when S1 is placed on the right, the polarity verification circuit is activated. When S2 of the two-position toggle switch is placed on the left, the V winding circuit is activated; when S2 is placed on the right, the W winding circuit is activated.

[0010] Preferably, there are 6 terminals, namely U1, V1, W1, U2, V2, and W2, which correspond to the six terminals of the three windings of the motor.

[0011] Preferably, the tester further includes a housing and an operation panel, wherein the fuse, the first set of single-position switches, the second set of single-position switches, the ammeter, the indicator light, the two-position toggle switch, and the terminal block are all located on the operation panel.

[0012] Preferably, the top of the box is connected to a lid via a hinge, and a latch is provided between the lid and the box.

[0013] Preferably, the signal light consists of three light-emitting diodes.

[0014] This utility model has the following beneficial effects:

[0015] This invention scientifically integrates the instruments, meters, various components, and connecting wires required for traditional motor polarity determination methods, forming a fully functional, portable, and easy-to-operate instrument. It has three main functions: motor winding search, polarity verification, and polarity identification. It uses a power supply and LEDs for winding search, optimizes the instruments used for motor testing, simplifies the above-mentioned polarity test operation steps, and can complete motor polarity testing in one stop. From the perspective of its overall principle and structure, it has obvious advantages in terms of advancement, scientificity, practicality, and scalability. Attached Figure Description

[0016] Figure 1 This is a perspective view of a motor polarity tester proposed in this utility model;

[0017] Figure 2 This is a circuit diagram of a motor polarity tester proposed in this utility model;

[0018] Figure 3 This is a schematic diagram of the overall operation panel of a motor polarity tester proposed in this utility model.

[0019] Legend:

[0020] 1. Enclosure; 2. Control panel; 21. Terminal block; 22. First set of single-position switches; 23. Indicator light; 24. Second set of single-position switches; 25. Two-position toggle switch; 26. Fuse; 27. Ammeter; 3. Cover; 4. Lock; 5. Hinge. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1

[0023] Taking a new low-voltage three-phase asynchronous motor as an example, select the "Polarity Verification" function to complete the "Check stator winding polarity" check step in the specification.

[0024] Reference Figures 1-3 One embodiment of this utility model is a motor polarity tester, which includes a DC power supply, a fuse 26, a first set of single-position switches 22, a second set of single-position switches 24, an ammeter 27, an indicator light 23, a two-position toggle switch 25, and a terminal block 21. There are two two-position toggle switches 25, namely S1 and S2.

[0025] The DC power supply powers the entire test instrument, fuse 26 provides short-circuit protection in case of potential internal or external power leakage, and the first set of single-position switches 22 are... Figure 2 SB1, SB2, and SB3, the second group of single-position switches 24 are Figure 2 SB, SB5, and SB4 correspond to different operational requirements. Signal light 23 consists of three LEDs, namely... Figure 2 When LED1, LED2, and LED3 are lit, it proves that the third winding of the motor is correct. When they are not lit, the winding can be found by referring to the corresponding LED.

[0026] The first set of single-position switch 22, terminal 21, indicator light 23, fuse 26, S1, DC power supply and motor three windings are connected to form a winding search circuit. When S1 of the two-position toggle switch 25 is placed on the left, the winding search circuit is connected, which allows the DC power supply to conduct the indicator light 23.

[0027] The second set of single-position switches 24, S1, S2, fuse 26, DC power supply, ammeter 27 and the three windings of the motor are connected to form two sets of polarity verification circuits. The two sets of polarity verification circuits are used to verify the U and V phase polarity of the motor windings and the U and W phase polarity of the motor windings, respectively. When S1 is on the right, the polarity verification circuit is connected. When S2 of the two-position toggle switch 25 is on the left, the V winding circuit is connected. The two are used together to verify the U and V phase polarity of the motor windings.

[0028] When S1 is placed on the right, the polarity verification circuit is activated; when S2 is placed on the right, the W winding circuit is activated. The combination of the two is used to verify the U and W phase polarity of the motor winding.

[0029] There are 6 terminals 21, namely U1, V1, W1, U2, V2, and W2, which correspond to the six terminals of the three windings of the motor. They are connected to each other by wires for testing.

[0030] Working principle:

[0031] (1) The six terminals of the motor coil winding are connected to the corresponding terminals 21 of the tester, namely U1, V1, W1, U2, V2, and W2;

[0032] (2) Place S1 on the left and press SB1, SB2 and SB3 in sequence. The corresponding LED1, LED2 and LED3 will light up in sequence, indicating that the three pairs of windings of the motor are correct.

[0033] (3) Place S1 on the right and S2 on the left. Press SB4 and hold it. At the instant SB is pressed, the pointer of ammeter 27 swings rapidly toward "+". Then U1 and V1 on the terminals are the same, indicating that the polarity of U1 and V1 is correct.

[0034] (4) Place S1 on the right and S2 on the right. Press SB5 and hold it. At the instant SB is pressed, the pointer of ammeter 27 swings rapidly toward "+". Then U1 and W1 on the terminals are the same, indicating that the polarity of U1 and W1 is correct.

[0035] (5) If U1 and V1, and U1 and W1 are terminals with the same name, then U1, V1, and W1 are terminals with the same name, and U2, V2, and W2 are terminals with the same name, indicating that the polarity of the motor is correct;

[0036] If U1 and V1, and U1 and W1 are terminals with the same name, then U1, V1, and W1 are terminals with the same name, and U2, V2, and W2 are terminals with the same name, indicating that the polarity of the motor is correct. If the indication is incorrect, swap the corresponding wiring and verify again.

[0037] The instrument is characterized by:

[0038] 1. Winding search (function 1): This is a function that all existing devices in the above-mentioned technology have. In the industry, a multimeter is usually used for this step. In this utility model, a power supply + light-emitting diode is used to search for the winding, which increases the function of the tester and makes the test more convenient.

[0039] 2. Polarity verification (Function 2): In existing technologies, verification is usually done by direct identification. For newly manufactured or newly installed motors, there is no need to search for windings or identify polarity; all wiring is connected according to the corresponding markings on the operation panel 2, and the correctness of the windings, polarity, and wiring can be determined by verification.

[0040] 3. Polarity identification (function 3): Existing testers almost always require two or more wiring connections, which are methods that are difficult for the average person to master. In this utility model, only one wiring connection is needed to identify the polarity of the three windings, making it easy to operate.

[0041] In terms of its overall principles and structure, it has obvious advantages in terms of advancement, scientific rigor, practicality, and applicability.

[0042] The "motor" in the motor polarity tester proposed in this utility model refers to a motor that generates kinetic or electrical energy by using the rotating magnetic field of coil windings, including but not limited to AC / DC, high and low voltage, large and small, asynchronous and synchronous motors or generators.

[0043] Example 2

[0044] To facilitate the testing of motors under different conditions, the instrument should be portable.

[0045] Therefore, further, such as Figure 1 and Figure 3 As shown, the tester also includes a housing 1 and an operation panel 2. The fuse 26, the first set of single-position switches 22, the second set of single-position switches 24, the ammeter 27, the indicator light 23, the two-position toggle switch 25, and the terminal block 21 are all located on the operation panel 2. Each operating component on the operation panel 2 is marked with a corresponding label for easy connection to the three winding terminals of the motor. The top of the housing 1 is connected to the housing cover 3 by a hinge 5. When carrying, the housing cover 3 can be covered to protect the internal components. A latch 4 is provided between the housing cover 3 and the housing 1 to facilitate connection between the housing cover 3 and the housing 1 for easy carrying. The latch 4 can be a butterfly lock, hook and loop fastener, or other fastener types.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A motor polarity tester, characterized in that: The tester includes a DC power supply, a fuse (26), a first set of single-position switches (22), a second set of single-position switches (24), an ammeter (27), an indicator light (23), a two-position toggle switch (25), and a terminal block (21). The two-position toggle switch (25) consists of two switches, namely S1 and S2. The first group of single-position switch (22), terminal (21), indicator light (23), fuse (26), S1, DC power supply and motor three windings are connected to form a winding search circuit; The second set of single-position switches (24), S1, S2, fuse (26), DC power supply, ammeter (27) are connected to the three windings of the motor to form two sets of polarity verification circuits. The two sets of polarity verification circuits are used to verify the U and V phase polarity of the motor windings and the U and W phase polarity of the motor windings, respectively.

2. The motor polarity tester according to claim 1, characterized in that: When S1 of the two-position toggle switch (25) is placed on the left, the winding search circuit is connected; when S1 is placed on the right, the polarity verification circuit is connected. When S2 of the two-position toggle switch (25) is placed on the left, the V winding circuit is connected; when S2 is placed on the right, the W winding circuit is connected.

3. The motor polarity tester according to claim 1, characterized in that: There are 6 terminals (21), namely U1, V1, W1, U2, V2, and W2, which correspond to the six terminals of the three windings of the motor.

4. The motor polarity tester according to claim 1, characterized in that: The tester also includes a housing (1) and an operation panel (2). The fuse (26), the first set of single-position switches (22), the second set of single-position switches (24), the ammeter (27), the indicator light (23), the two-position toggle switch (25), and the terminal block (21) are all located on the operation panel (2).

5. The motor polarity tester according to claim 4, characterized in that: The top of the box (1) is rotatably connected to the box cover (3) via a hinge (5), and a latch (4) is provided between the box cover (3) and the box (1).

6. The motor polarity tester according to claim 1, characterized in that: The signal light (23) consists of three light-emitting diodes.

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