A motor shaft voltage and current measuring device

Abstract

The utility model belongs to motor performance detection technical field, concretely speaking, the utility model relates to a kind of motor shaft voltage and current measuring device;A kind of motor shaft voltage and current measuring device, including measuring motor, including bottom plate, the movable clamping plate structure is provided at the both sides of bottom plate, the movable clamping plate structure is in abutment with motor shell, measurement structure is provided on the bottom plate;Operator holds the second rotary ring plate of one end of insulating rod, insulating rod is screw connection with bottom plate, insulating rod moves along axial direction to motor shaft direction in rotation process, the carbon brush of end portion is synchronous with insulating rod close to motor shaft. Until carbon brush and motor shaft surface tightly abut, connect the connecting line on carbon brush with motor shell, connect motor shaft and motor shell to form line passage by carbon brush and connecting line, then using multimeter measures the voltage and current of motor shaft, ensure that the voltage and current of motor shaft are in normal range.

Description

Technical Field

[0001] This utility model belongs to the field of motor performance testing technology. Specifically, this utility model relates to a motor shaft voltage and current measuring device. Background Technology

[0002] In recent years, the sales of electric vehicles have been soaring, but this has also brought about quality issues. During motor operation, the motor shaft voltage and shaft current are key parameters reflecting the motor's insulation performance, electromagnetic compatibility, and bearing health. Excessive shaft voltage can easily lead to shaft current. When this current passes through the contact points between the bearing rolling elements and the inner and outer rings, it causes electrolytic corrosion, resulting in accelerated bearing wear, increased noise, and in severe cases, even motor shutdown. Currently, there is no specialized equipment for testing shaft voltage and current, leading to inaccurate test results or making testing impossible. Furthermore, the testing process poses certain risks to personnel.

[0003] Chinese Patent (Publication No.: 109444509B) discloses a device for measuring the bearing current of a wind turbine generator and its application, including a generator, a PWM converter, an encoder, a gearbox, and an oscilloscope. The stator of the generator is connected to the generator side of the PWM converter via a first cable, and the rotor of the generator is connected to the gearbox via a coupling. Grounding brushes are installed at both ends of the rotor. One end of the oscilloscope is connected to the grounding brushes, and the other end is connected to the generator housing and grounded. The encoder is installed on the non-drive end of the generator and is connected to the PWM converter via a second cable. The shaft voltage U is obtained using the oscilloscope, and then the bearing current is calculated according to the formula. However, the structure of the device for measuring the bearing current of the generator and its application is complex. Utility Model Content

[0004] This utility model is designed to solve the above-mentioned problems. Its purpose is to provide a simple motor shaft voltage and current measuring device that can measure motor shaft voltage and current. To achieve the above purpose, the technical solution adopted by this utility model is as follows: a motor shaft voltage and current measuring device, including a measuring motor, including a base plate, movable clamping plate structures are provided on both sides of the base plate, the movable clamping plate structures abut against the motor housing, and a measuring structure is provided on the base plate.

[0005] The measuring structure includes an insulating rod, one end of which penetrates through the base plate. A carbon brush is provided at the end of the insulating rod, and a connecting wire is provided on the carbon brush.

[0006] The movable clamping plate structure includes a threaded rod that passes through both sides of the base plate. Slide plates are provided at both ends of the threaded rod, and clamping plates are provided on the slide plates. The clamping plates abut against the housing of the measuring motor.

[0007] The end plate of the clamp is connected to an abutment plate.

[0008] Guide rods are provided through both sides of the base plate, and the guide rods pass through the sliding plate.

[0009] Limiting plates are provided at both ends of the guide rod.

[0010] The threaded rod is provided with a first rotating annular plate at both ends.

[0011] A second rotating annular plate is provided at one end of the insulating rod.

[0012] The technical effect of this utility model is as follows: The motor to be measured is placed in the center of the base plate 1, ensuring that the motor shaft faces the direction of the carbon brush in the measuring structure. The operator holds the first rotating ring plate at both ends of the threaded rod with both hands. The threaded rod, the base plate, and the sliding plate are all threadedly connected. During the rotation, the sliding plates on both sides will move synchronously along the axial direction of the threaded rod and approach the motor. The abutment plate vertically connected to the bottom of the clamping plate approaches the motor housing along with the clamping plate until the abutment plate is tightly abutted against the bottom of the motor housing and the clamping plate is in contact with the side of the motor housing. At this time, the entire device and the motor are firmly fixed together without any risk of shaking.

[0013] The operator holds the second rotating ring plate at one end of the insulating rod. Because the insulating rod is threaded to the base plate, it moves axially towards the motor shaft during rotation, and the carbon brush at the end moves closer to the motor shaft synchronously with the insulating rod. This continues until the carbon brush is firmly against the surface of the motor shaft. The connecting wire on the carbon brush is then connected to the motor housing. The motor shaft, carbon brush, and motor housing are connected by the connecting wire, creating a circuit between them. Next, a multimeter is used to measure the voltage and current of the motor shaft, ensuring that these are within the normal range. Attached Figure Description

[0014] This manual includes the following figures, which illustrate the following: Figure 1 This is an overall structural diagram of a motor shaft voltage and current measuring device according to this utility model.

[0015] The following are marked in the diagram: 1. Base plate; 2. Movable clamping plate structure; 201. Threaded rod; 202. Slide plate; 203. Clamping plate; 3. Measuring structure; 301. Insulating rod; 302. Carbon brush; 303. Connecting wire; 4. Abutment plate; 5. Guide rod; 501. Limiting plate; 6. First rotating ring plate; 7. Second rotating ring plate. Detailed Implementation

[0016] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0017] like Figure 1 As shown, a motor shaft voltage and current measuring device includes a measuring motor and a base plate 1. Movable clamping structures 2 are provided on both sides of the base plate 1, and the movable clamping structures 2 abut against the motor housing. A measuring structure 3 is provided on the base plate 1. The movable clamping structures 2 clamp the motor housing to prevent shaking during measurement. The measuring structure 3 is connected to the motor shaft and the motor housing. Two positive and negative terminals of a multimeter are connected to the motor shaft and the motor housing respectively to measure the motor shaft voltage and shaft current. During testing, technicians do not need to manually fix the motor, improving safety. Furthermore, using the movable clamping structures 2 to clamp the motor housing avoids damaging the sample and prevents inaccurate measurements due to loose clamps.

[0018] The measuring structure 3 includes an insulating rod 301, one end of which penetrates the base plate 1. A carbon brush 302 is provided at the end of the insulating rod 301, and a connecting wire 303 is provided on the carbon brush 302. The insulating rod 301 is threaded to the base plate 1. By rotating the insulating rod 301, the carbon brush 302 is pressed against the motor shaft. Then, the connecting wire 303 is connected to the motor housing. The motor housing and the motor shaft are connected by a circuit through the carbon brush 302 and the connecting wire 303. Then, the voltage and current of the motor shaft are measured by contacting the positive and negative terminals of a multimeter with the motor housing and the motor shaft respectively.

[0019] The movable clamping plate structure 2 includes a threaded rod 201 that passes through both sides of the base plate 1. Slide plates 202 are provided at both ends of the threaded rod 201, and clamping plates 203 are mounted on the slide plates 202, abutting against the measuring motor housing. The threaded rod 201 passes through the base plate 1 and the slide plates 202, and is threadedly connected to both. By rotating the threaded rod 201, the slide plates 202 move accordingly, causing the clamping plates 203 to move. The distance between the two clamping plates 203 can be flexibly adjusted. The clamping plates 203 move with the rotation of the threaded rod 201 until they are firmly pressed against the motor housing, fixing the motor housing and preventing wobbling during measurement, which could lead to inaccurate results. By moving the clamping plates 203, different types of motor housings can be fixed without changing the clamps, reducing the cost of the measuring equipment.

[0020] The clamping plate 203 has an abutment plate 4 connected to its end plate. The bottom of the clamping plate 203 is vertically connected to the abutment plate 4, which abuts against the bottom of the motor housing. Through the combined action of the clamping plate 203 and the abutment plate 4, the entire device and the motor can be fixed together to prevent inaccurate measurement results during measurement.

[0021] Guide rods 5 are installed through both sides of the base plate 1, and the guide rods 5 pass through the slide plate 202. The guide rods 5 pass through the base plate 1 and the slide plate 202. By rotating the threaded rod 201, the slide plate 202 moves with the rotation of the threaded rod 201. When adjusting the distance between the two clamping plates 203, the guide rods 5 can make the movement of the slide plate 202 more stable. The guide rods 5 guide the movement of the slide plate 202 and allow the slide plate 202 to move in a straight line along the guide rods 5. At the same time, the guide rods 5 prevent the slide plate 202 from rotating circumferentially with the rotation of the threaded rod 201, or from tilting or deviating due to uneven force.

[0022] Limiting plates 501 are provided at both ends of the guide rod 5. The limiting plates 501 are made of circular metal plates and are welded and fixed to both ends of the guide rod 5. The size of the limiting plates 501 is larger than the diameter of the guide rod 5. When the slide plate 202 moves along the guide rod 5 to both ends, the limiting plates 501 will block the slide plate 202, prevent the slide plate 202 from moving further outward, limit the maximum travel of the slide plate 202, and prevent the slide plate 202 from slipping off the end of the guide rod 5.

[0023] The threaded rod 201 has a first rotating annular plate 6 at both ends. The first rotating annular plate 6 is a circular metal ring structure, and its outer diameter is larger than that of the threaded rod 201. The lever arm for rotating the first rotating annular plate 6 is its radius, which is larger than that for directly rotating the threaded rod 201. Only a small force needs to be applied to rotate the threaded rod 201 through the first rotating annular plate 6, significantly reducing the operating force when clamping or releasing the motor. At the same time, the first rotating annular plate 6 can also restrict the slide plate 202, preventing it from moving further outward from the threaded rod 201, limiting its maximum travel, and preventing it from slipping off the end of the threaded rod 201.

[0024] A second rotating annular plate 7 is provided at one end of the insulating rod 301. The outer diameter of the second rotating annular plate 7 is much larger than the diameter of the insulating rod 301. The lever arm when rotating the second rotating annular plate 7 is equal to the radius of the second rotating annular plate 7, which is larger than the lever arm when directly rotating the insulating rod 301. The operator only needs to apply a small force to drive the insulating rod 301 to move smoothly along the axial direction through the second rotating annular plate 7, easily controlling the contact pressure between the carbon brush 302 and the motor shaft, and avoiding excessive or insufficient carbon brush pressure due to uneven direct force application.

[0025] Place the motor to be measured in the center of the base plate 1, ensuring that the motor shaft faces the direction of the carbon brush 302 in the measuring structure 3. The operator holds the first rotating ring plate 6 at both ends of the threaded rod 201 with both hands. The threaded rod 201 is threadedly connected to the base plate 1 and the sliding plate 202. During rotation, the sliding plates 202 on both sides will move synchronously along the axial direction of the threaded rod 201 and approach the motor housing. The abutment plate 4 vertically connected to the bottom of the clamping plate 203 approaches the motor housing along with the clamping plate 203 until the abutment plate 4 is tightly abutted against the bottom of the motor housing and the clamping plate 203 is in contact with the side of the motor housing. At this time, the entire device and the motor are firmly fixed together without any risk of shaking.

[0026] The operator holds the second rotating annular plate 7 at one end of the insulating rod 301. Because the insulating rod 301 is threadedly connected to the base plate 1, during rotation, the insulating rod 301 moves axially towards the motor shaft, and the carbon brush 302 at its end moves towards the motor shaft synchronously with the insulating rod 301. This continues until the carbon brush 302 is firmly against the surface of the motor shaft. The connecting wire 303 on the carbon brush 302 is then connected to the motor housing, forming a circuit path between the motor shaft and the motor housing through the carbon brush 302 and the connecting wire 303. Next, a multimeter is used to measure the voltage and current of the motor shaft, ensuring that the voltage and current of the motor shaft are within the normal range.

[0027] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A device for measuring motor shaft voltage and current, comprising measuring a motor, characterized in that, Includes a base plate (1), on both sides of the base plate (1) are movable clamping structures (2), the movable clamping structures (2) abut against the motor housing, and a measuring structure (3) is provided on the base plate (1).

2. The motor shaft voltage and current measuring device according to claim 1, characterized in that: The measuring structure (3) includes an insulating rod (301), one end of which penetrates the base plate (1), and a carbon brush (302) is provided at the end of the insulating rod (301), with a connecting wire (303) provided on the carbon brush (302).

3. The motor shaft voltage and current measuring device according to claim 1, characterized in that: The movable clamping plate structure (2) includes a threaded rod (201) that passes through both sides of the base plate (1). Slide plates (202) are provided at both ends of the threaded rod (201), and clamping plates (203) are provided on the slide plates (202). The clamping plates (203) abut against the housing of the measuring motor.

4. The motor shaft voltage and current measuring device according to claim 3, characterized in that: The end plate of the clamp (203) is connected to an abutment plate (4).

5. The motor shaft voltage and current measuring device according to claim 3, characterized in that: Guide rods (5) are provided through both sides of the base plate (1), and the guide rods (5) pass through the slide plate (202).

6. The motor shaft voltage and current measuring device according to claim 5, characterized in that: Limiting plates (501) are provided at both ends of the guide rod (5).

7. The motor shaft voltage and current measuring device according to claim 3, characterized in that: The threaded rod (201) is provided with a first rotating annular plate (6) at both ends.

8. The motor shaft voltage and current measuring device according to claim 2, characterized in that: A second rotating annular plate (7) is provided at one end of the insulating rod (301).

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