Magnetic flux measuring equipment for motor rotor

Abstract

The invention discloses a device for measuring magnetic flux of a motor rotor. The device comprises an annular support, a Hall sensor, a signal processing module, a wireless transmission module and a rechargeable power supply module. The annular support is made of a non-magnetic material, and an adjustable buckle is arranged on the inner side of the annular support and used for being fixed to the outer surface of a motor rotor. The Hall sensors are uniformly arranged in the circumferential direction of the annular bracket, and the detection surface of each Hall sensor faces the surface of the motor rotor; the signal processing module is arranged on the outer side of the annular support, electrically connected with the Hall sensor and used for receiving and amplifying sensor signals. The wireless transmission module is connected with the signal processing module and is used for sending the processed data to an external terminal; the rechargeable power module is fixedly arranged on one side of the annular support and electrically connected with the Hall sensor, the signal processing module and the wireless transmission module. The device for measuring the magnetic flux of the motor rotor has the advantage of being accurate in measurement result.

Description

Technical Field

[0001] The present invention relates to the technical field of motor detection, and particularly to a device for measuring the magnetic flux of a motor rotor. Background Art

[0002] The rotor magnetic flux is an important parameter during the operation of a motor, and its accurate detection is crucial for ensuring the performance and safe operation of the motor. When the existing magnetic flux measurement device uses a single Hall sensor, due to the uneven magnetic field distribution on the rotor surface, the measurement result is inaccurate. Summary of the Invention

[0003] In view of the above problems, the present invention provides a device for measuring the magnetic flux of a motor rotor, which has the advantage of accurate measurement results.

[0004] The technical solution of the present invention is as follows:

[0005] A device for measuring the magnetic flux of a motor rotor, comprising:

[0006] An annular bracket, with adjustable buckles provided on the inner side for fixing on the outer surface of the motor rotor;

[0007] Hall sensors, including a plurality of them, evenly arranged in the circumferential direction of the annular bracket, and the detection surface of each Hall sensor faces the surface of the motor rotor;

[0008] A signal processing module, provided on the outer side of the annular bracket, electrically connected to the Hall sensors, for receiving and amplifying the sensor signals;

[0009] A wireless transmission module, connected to the signal processing module, for sending the processed data to an external terminal;

[0010] A rechargeable power supply module, fixedly provided on one side of the annular bracket, electrically connected to the Hall sensors, the signal processing module and the wireless transmission module.

[0011] In a further technical solution, the annular bracket includes a plurality of segments, and adjacent segments are connected by hinges.

[0012] In a further technical solution, slide rails are provided on the inner side of the segments, and the Hall sensors are arranged on the inner side of the annular bracket through the slide rails.

[0013] In a further technical solution, an electromagnetic shielding layer is included on the outer side of the signal processing module, and the electromagnetic shielding layer is epoxy resin wrapped with copper foil, with a thickness of 0.5 - 1.2 mm.

[0014] In a further technical solution, positioning marks are provided on the inner side of the annular bracket, and the positioning marks are aligned with the magnetic pole center line of the motor rotor.

[0015] In a further technical solution, the rechargeable power supply module includes a lithium battery pack and a wireless charging coil integrally arranged.

[0016] In a further technical solution, the annular bracket is made of non-magnetic material.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. Multiple Hall sensors are used to synchronously collect data, which is convenient for generating a cloud map of the magnetic flux distribution on the rotor surface by combining software algorithms, and the error rate is <3%;

[0019] 2. The annular bracket is formed by multiple segmented hinges, which is convenient for adjusting according to motor rotors with different diameters and has a wide application range;

[0020] 3. An electromagnetic shielding layer is added to the signal processing module, reducing the signal noise;

[0021] 4. The rechargeable power supply module can achieve wireless charging, avoiding the disassembly of the annular bracket and improving the continuous detection efficiency. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of a motor rotor magnetic flux measuring device according to an embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of the segment according to an embodiment of the present invention.

[0024] Description of the Reference Numerals:

[0025] 10. Annular bracket; 11. Adjustable buckle; 12. Slide rail; 13. Segment; 14. Strip hole; 15. Bolt; 20. Hall sensor; 30. Signal processing module; 40. Wireless transmission module; 50. Rechargeable power supply module. Detailed Embodiment

[0026] The following further describes the embodiments of the present invention with reference to the drawings.

[0027] Embodiment:

[0028] As Figure 1 - Figure 2As shown in the figure, a device for measuring the magnetic flux of a motor rotor includes an annular bracket 10, Hall sensors 20, a signal processing module 30, a wireless transmission module 40, and a rechargeable power module 50; the annular bracket 10 is made of non-magnetic material, and an adjustable buckle 11 is provided on the inner side for fixing on the outer surface of the motor rotor; there are multiple Hall sensors 20, which are evenly arranged in the circumferential direction of the annular bracket 10, and the detection surface of each Hall sensor 20 faces the surface of the motor rotor; the signal processing module 30 is arranged outside the annular bracket 10 and is electrically connected to the Hall sensors 20, including a preamplifier, a band-pass filter, and an AD conversion chip, for receiving and amplifying the sensor signals; the wireless transmission module 40 is connected to the signal processing module 30 for sending the processed data to an external terminal; the rechargeable power module 50 is fixedly arranged on one side of the annular bracket 10, and a lithium battery pack and an integrated wireless charging coil can be selected, and is electrically connected to the Hall sensors 20, the signal processing module 30, and the wireless transmission module 40.

[0029] The working principle of the above technical solution is as follows:

[0030] During use, the annular bracket 10 is fixed to the outside of the motor rotor through an adjustable bayonet, so that a gap of 1-2 mm is maintained between the detection surface of the Hall sensor 20 and the rotor surface. The Hall sensor 20 outputs an analog signal of 0-5V. After being amplified and filtered by the signal processing module 30, it is converted into a digital signal by the AD chip and sent to the PC side through the wireless transmission module 40. A magnetic flux-angle curve is generated through special software. Synchronous data acquisition by multiple Hall sensors 20 can reduce the test error.

[0031] In another embodiment, as Figure 1 - 2 shown, the annular bracket 10 includes multiple segments 13, and adjacent segments 13 are connected by hinges.

[0032] The diameter of the annular bracket 10 can be adjusted by the hinge angle.

[0033] In another embodiment, as Figure 1 - 2 shown, a slide rail 12 is provided on the inner side of the segment 13, and a slider is provided on one side of the Hall sensor 20. The slider is connected to the slide rail 12 and is arranged on the inner side of the annular bracket 10. A strip hole 14 is provided on the side wall of the slide rail 12, and a bolt 15 threadedly connected to the slider passes through the strip hole 14.

[0034] The distance between two adjacent Hall sensors 20 can be manually adjusted through the slide rail 12, and after adjustment, the bolt 15 is tightened to lock the position of the Hall sensor 20.

[0035] In another embodiment, an electromagnetic shielding layer is included on the outer side of the circuit board of the signal processing module 30. The electromagnetic shielding layer is epoxy resin wrapped with copper foil, and the thickness is 0.5-1.2 mm.

[0036] The signal processing module 30 is additionally provided with an electromagnetic shielding layer, which reduces the signal noise.

[0037] In another embodiment, positioning marks are provided on the inner side of the annular bracket 10, and the positioning marks are aligned with the magnetic pole center line of the motor rotor.

[0038] It is convenient to quickly position and install the annular bracket 10.

[0039] The above-described embodiments only represent the specific embodiments of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A motor rotor magnetic flux measuring device, characterized in that, Comprising: A ring-shaped bracket, with an adjustable buckle provided on the inner side for fixing to the outer surface of the motor rotor; Hall sensors, including multiple ones, evenly arranged in the circumferential direction of the ring-shaped bracket, and the detection surface of each Hall sensor faces the surface of the motor rotor; A signal processing module, arranged on the outside of the ring-shaped bracket, electrically connected to the Hall sensors, for receiving and amplifying the sensor signals; A wireless transmission module, connected to the signal processing module, for sending the processed data to an external terminal; A rechargeable power supply module, fixedly arranged on one side of the ring-shaped bracket, electrically connected to the Hall sensors, the signal processing module and the wireless transmission module.

2. The motor rotor magnetic flux measuring device according to claim 1, wherein The ring-shaped bracket includes multiple segments, and adjacent segments are connected by hinges.

3. The motor rotor magnetic flux measuring device according to claim 2, characterized in that, A slide rail is provided on the inner side of the segment, and the Hall sensor is arranged on the inner side of the ring-shaped bracket through the slide rail.

4. A motor rotor magnetic flux measuring device according to claim 1, characterized in that, The outside of the signal processing module includes an electromagnetic shielding layer, and the electromagnetic shielding layer is epoxy resin wrapped with copper foil, with a thickness of 0.5 - 1.2 mm.

5. The motor rotor magnetic flux measuring device according to claim 1, characterized in that, Positioning marks are provided on the inner side of the ring-shaped bracket, and the positioning marks are aligned with the magnetic pole center line of the motor rotor.

6. The motor rotor magnetic flux measuring device according to claim 1, characterized in that, The rechargeable power supply module includes a lithium battery pack and an integrally arranged wireless charging coil.

7. A motor rotor magnetic flux measuring device according to claim 1, characterized in that, The ring-shaped bracket is made of non-magnetic material.

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