Motor pole number detection tool

Abstract

The utility model discloses a motor pole number detection tool, and relates to the technical field of motor maintenance. The device comprises a nylon rod, one end of the nylon rod is rotatably provided with a pointer, the pointer is of a rhombic structure, and one end of the nylon rod, which is provided with the pointer, points to the interior of a motor stator winding. Based on the characteristics of electromagnetic induction and magnetic field distribution, the pole number of the magnetic field can be judged by observing the relative movement condition of the pointer, and each pair of magnetic poles can enable the pointer to complete one-time relative movement.

Description

Technical Field

[0001] This utility model relates to the field of motor repair technology, and in particular to a tool for detecting the number of poles in a motor. Background Technology

[0002] To ensure the smooth operation of motor equipment, motor maintenance is crucial. During maintenance, motors that require rewinding are frequently encountered. However, due to the various environmental challenges motors may face during use, their nameplates often fall off or wear down, making it impossible to directly read the motor's pole number information. Furthermore, after replacing the coil, it is necessary to check whether the internal wiring (polarity) is correct. As a result, the inspection personnel need to invest a significant amount of time in troubleshooting and testing one by one. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a motor pole number detection tool to solve the difficulty in detecting the number of motor poles when rewinding is required during motor repair.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A tool for detecting the number of poles of an electric motor includes a nylon rod with a pointer rotatably mounted on one end of the rod. The pointer has a diamond-shaped structure.

[0006] A disc is rotatably mounted on the other end of the nylon rod.

[0007] Compared with the prior art, the advantages of this utility model are: the utility model has a simple structure, is easy to install, and has a low cost. Based on the characteristics of electromagnetic induction and magnetic field distribution, the number of magnetic field poles can be determined by observing the relative movement of the pointer. Each pair of magnetic poles will cause the pointer to complete one relative movement. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model.

[0009] In the picture:

[0010] 1. Nylon rod; 2. Pointer; 3. Disc. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0012] A tool for detecting the number of poles of a motor includes a nylon rod with a pointer rotatably mounted on one end of the nylon rod. The pointer has a diamond-shaped structure, and the end of the nylon rod with the pointer points to the inside of the stator winding of the motor.

[0013] A disc is rotatably mounted on the other end of the nylon rod, with the end of the nylon rod having the disc pointing towards the inside of the motor stator winding.

[0014] Extreme number test operation steps:

[0015] a. Connect any two phases of the stator winding of the motor with a rated voltage of 380V to any two phases of 40-50V (output 40-50V through a voltage regulator), and leave the remaining phase of the motor and power supply unconnected.

[0016] b. Connect the power supply;

[0017] c. Using a testing tool, hold the tail (disc end) of nylon rod 1 and point the end with pointer 2 towards the inside of the motor stator winding;

[0018] d. Initially, the arrow of pointer 2 is perpendicular to the iron core. Rotate pointer 2 until the arrow on the other side is perpendicular to the iron core, indicating stage 1. Pointer 2 circles the stator once to confirm the number of poles of the motor. (Note: For three-phase asynchronous motor pole number testing, for motors with a rated voltage of 380V, use a 40-50V power supply; for motors with a rated voltage of 6kV or 10kV, use a 380V power supply.)

[0019] The principle of determining the number of poles in a motor stator winding using two-pointed pointers (2) when a two-phase alternating current is applied is primarily based on the characteristics of electromagnetic induction and magnetic field distribution. When alternating current passes through the stator winding, an alternating magnetic field is generated around it. The direction and intensity of this magnetic field change with the current. The stator winding typically consists of multiple coils arranged in a specific pattern on the stator core. When current flows through, each coil generates its own magnetic field, which superimposes to form a total magnetic field. Using two pointers (2) with their tips facing each other, the magnetic field causes these pointers (2) to move relative to each other when the stator winding is energized. By observing the relative movement of the pointers (2), the number of magnetic poles can be determined; each pair of poles causes the pointers to complete one relative movement.

[0020] Polarity test operation steps:

[0021] a. Connect the stator winding terminals of the motor with a rated voltage of 380V to be tested to a voltage of 40-50V;

[0022] b. Connect the power supply;

[0023] c. Using a testing tool, hold the tail of the nylon rod 1 (pointer end) with the end equipped with the disc 3 pointing towards the inside of the motor stator winding;

[0024] d. Observe the rotation direction of disk 3. If the rotation direction is consistent with the rotation of disk 3 around the stator, then the motor wiring is confirmed to be correct. (Note: For three-phase asynchronous motor polarity testing, for motors with a rated voltage of 380V, use a 40-50V power supply; for motors with a rated voltage of 6kV or 10kV, use a 380V power supply.)

[0025] Three-phase alternating current is injected into three coils. These three currents are 120° out of phase to ensure uniform spatial and temporal distribution. As the current flows through the coils, a magnetic field is generated around them. Due to the different phases of the currents in the three coils, their magnetic fields superimpose in a specific way, forming a rotating magnetic field. When this rotating magnetic field acts on disk 3, it experiences a torque, causing it to rotate. By observing the rotation of disk 3, the correctness of the connection between the phase groups can be checked. Incorrect connections can lead to an uneven distribution of the magnetic field, affecting the rotational performance of disk 3. For example, if the current phase of one coil is mismatched with the other two coils, its generated magnetic field may cancel out the rotating magnetic field, preventing disk 3 from rotating. Besides checking connections, this method can also be used to detect faults in the windings, such as open circuits, short circuits, or poor contact. These faults typically result in an uneven distribution of the magnetic field, thus affecting the rotational performance of disk 3.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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 tool for detecting the number of poles of a motor, characterized in that: Includes a nylon rod (1), on one end of which a pointer (2) is rotatably mounted, the pointer (2) having a rhomboid structure.

2. The motor pole number detection tool according to claim 1, characterized in that: A disc (3) is rotatably mounted on the other end of the nylon rod (1).

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