A motor rotor internal magnet automatic detection device based on mechanical pulling force

Abstract

The utility model discloses a kind of motor rotor internal magnet automatic detection devices based on mechanical tension, it includes the PLC control system being mounted on base plate, magnet detection component and rotor rotation fixed component, the magnet detection component includes the horizontal drive module being mounted on the top of base plate.The utility model is by rotor is loaded into the inner cavity of V-shaped groove on pedestal, then pneumatic clamping air cylinder is clamped to the outer wall of rotor, positioning pin on pedestal is inserted into rotor end face hole, horizontal drive module elongation makes that electromagnetic detection probe moves to the center of rotor inner cavity, electromagnetic detection probe is electrified, servo motor is rotated in turn by protractor plate, multiple angle stays, and records tension value, if certain angle tension does not comply, determine magnet loss and trigger alarm, can reach through protractor rotation and electromagnetic probe combination, realize the purpose of low cost, high accuracy, strong anti-interference magnet assembly detection.

Description

Technical Field

[0001] This utility model belongs to the field of motor production and testing technology, and in particular relates to an automated testing device for the internal magnets of a motor rotor based on mechanical tension. Background Technology

[0002] In the production of permanent magnet synchronous motors, multiple sets of permanent magnets need to be embedded in the rotor cavity to optimize the magnetic field distribution. Traditional inspection relies on manual visual inspection or manual tension testing, which is inefficient and prone to missed detections. Existing automated equipment mostly uses X-ray or Hall sensor inspection, but it has the following drawbacks: X-ray inspection: expensive and requires radiation protection, unsuitable for small and medium-sized production lines; Hall sensor inspection: susceptible to electromagnetic interference from motor windings, resulting in a high false alarm rate; existing equipment is difficult to adapt to rotors of different sizes and pole numbers. Therefore, we designed an automated inspection device for the internal magnets of motor rotors based on mechanical tension. By combining indexing rotation with an electromagnetic probe, we achieve low-cost, high-precision, and highly interference-resistant magnet assembly inspection. Utility Model Content

[0003] The purpose of this invention is to provide an automated detection device for the internal magnets of a motor rotor based on mechanical tension. This device combines indexing rotation with an electromagnetic probe to achieve low-cost, high-precision, and highly interference-resistant magnet assembly detection, thereby solving the aforementioned technical problems.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: An automated detection device for the internal magnet of a motor rotor based on mechanical tension, comprising a PLC control system mounted on a base plate, a magnet detection component, and a rotor rotation fixing component. The magnet detection component includes a horizontal drive module mounted on the top of the base plate. A micrometer adjustment platform is fixedly mounted on the moving end of the horizontal drive module. Three electromagnetic detection probes are mounted on the micrometer adjustment platform at equal intervals. A tension sensor is provided on one side of each electromagnetic detection probe. The rotor rotation fixing component includes a stabilizing bracket fixedly mounted on the base plate. A servo motor is fixedly mounted on the bottom of the base plate. An indexing plate is mounted on the top of the base plate. The output shaft of the servo motor is mounted on the indexing plate. A base is mounted on the top of the indexing plate. Two symmetrical positioning pins are provided on the top of the base. A pneumatic clamping cylinder is mounted on the top of the indexing plate platform. An alarm is provided on the PLC control system.

[0005] Preferably, the top of the base is provided with a V-shaped groove, and a polyurethane anti-slip pad is embedded in the V-shaped groove.

[0006] Preferably, the electromagnetic detection probe has 550 coil turns and an operating current of 0.5A.

[0007] Preferably, the positioning pin is circumferentially zero-position aligned with the process hole on the rotor end face.

[0008] Preferably, the indexing disk is connected to an absolute encoder with an angular resolution ≤0.01° and a repeatability of ±0.1°.

[0009] The beneficial effects of this utility model are:

[0010] This invention involves installing a rotor into the inner cavity of a V-shaped groove on a base, followed by a pneumatic clamping cylinder clamping the outer wall of the rotor. A positioning pin on the base is inserted into the end hole of the rotor. The horizontal drive module extends, causing the electromagnetic detection probe to move to the center of the rotor's inner cavity. The electromagnetic detection probe is powered on, and the servo motor rotates sequentially through the indexing plate, stopping at multiple angles and recording the tension value. If the tension at a certain angle is not met, it is determined that a magnet is missing and an alarm is triggered. This invention achieves the goal of low-cost, high-precision, and highly anti-interference magnet assembly detection by combining indexing rotation with an electromagnetic probe. Attached Figure Description

[0011] The advantages of the present invention, as described above and / or in the following detailed description in conjunction with the accompanying drawings, will become clearer and more readily understood. These drawings are merely illustrative and do not limit the scope of the present invention.

[0012] Figure 1 This is a three-dimensional schematic diagram of one embodiment of the present utility model;

[0013] Figure 2 This is a three-dimensional schematic diagram of a horizontal drive module according to an embodiment of the present invention;

[0014] Figure 3 This is a schematic diagram of a rotor rotation fixing assembly according to an embodiment of the present invention;

[0015] Figure 4 This is one embodiment of the present utility model. Figure 3 A magnified view of point A in the middle;

[0016] Figure 5 This is a three-dimensional schematic diagram of the base of one embodiment of the present utility model.

[0017] The attached diagram lists the components represented by each number as follows:

[0018] 1. Base plate; 2. PLC control system; 3. Magnet detection component; 31. Horizontal drive module; 32. Micrometer adjustment table; 33. Electromagnetic detection probe; 34. Tension sensor; 4. Rotor rotation fixing component; 41. Stabilizing bracket; 42. Servo motor; 43. Indexing plate; 44. Base; 45. Pneumatic clamping cylinder; 46. Positioning pin. Detailed Implementation

[0019] In the following description, embodiments of the automated detection device for the internal magnets of a motor rotor based on mechanical tension will be described with reference to the accompanying drawings.

[0020] Figures 1-5 This invention illustrates an embodiment of an automated detection device for the internal magnets of a motor rotor based on mechanical tension. It comprises a PLC control system 2, a magnet detection component 3, and a rotor rotation fixing component 4, all mounted on a base plate 1. The magnet detection component 3 includes a horizontal drive module 31 mounted on the top of the base plate 1. A micrometer adjustment platform 32 is fixedly mounted on the moving end of the horizontal drive module 31. Three equally spaced electromagnetic detection probes 33 are mounted on the micrometer adjustment platform 32. A tension sensor 34 is provided on one side of each electromagnetic detection probe 33. The electromagnetic detection probe 33 has a coil with 550 turns and an operating current of 0.5A. The rotor rotation fixing component 4 includes components fixedly mounted on the base plate 1. A stabilizing bracket 41 is mounted on the base plate 1. A servo motor 42 is fixedly installed at the bottom of the base plate 1. An indexing plate 43 is installed above the base plate 1. The indexing plate 43 is connected to an absolute encoder with an angle resolution of ≤0.01° and a repeatability of ±0.1°. The output shaft of the servo motor 42 is mounted on the indexing plate 43. A base 44 is installed on the top of the indexing plate 43. Two symmetrical positioning pins 46 are provided on the top of the base 44. The positioning pins 46 are aligned with the process holes on the rotor end face to achieve circumferential zero position. A pneumatic clamping cylinder 45 is installed on the top of the indexing plate 43 platform. An alarm is installed on the PLC control system 2. A V-groove is opened on the top of the base 44, and a polyurethane anti-slip pad is embedded in the V-groove.

[0021] Working principle: The servo motor 42 has a rated torque of 5 N·m and is equipped with a 17-bit absolute encoder with an angle repeatability of ±0.1°. The indexing plate 43 has an indexing angle θ=360° / N (N is the number of magnets designed), supporting rotors with N=4-24 poles. The base 44 adopts a V-groove design with embedded polyurethane anti-slip pads, adapting to rotors with a diameter of 50-200mm. The pneumatic clamping cylinder 45 has an output force ≥200N and a clamping stability of ±0.05mm. The positioning pin 46 has a diameter tolerance of H7 grade and is inserted into the process hole on the rotor end face to achieve circumferential zero-position alignment. The electromagnetic detection probe 33 has 500 coil turns, an operating current of 0.5A, and an adjustable magnetic field strength (0.1-1.0T). The tension sensor 34 has a range of 0-50N, an accuracy of ±0.5%FS, and a sampling frequency of 100Hz. The horizontal drive module 31 has a repeatability of ±0.02mm and an adjustable moving speed of 10-100mm / s. The horizontal drive module 31 is a cylinder structure.

[0022] During use, the rotor is placed into the V-groove on the base 44, and then clamped by the pneumatic clamping cylinder 45. The positioning pin 46 on the base 44 is inserted into the end hole of the rotor. The horizontal drive module 31 drives the micrometer adjustment table 32, the electromagnetic detection probe 33 and the tension sensor 34, so that the electromagnetic detection probe 33 is inside the rotor. At this time, the electromagnetic coil is energized, and the servo motor 42 drives the indexing plate 43 to rotate, rotating 0 degrees, 45 degrees, 90 degrees...315 degrees in sequence, each angle for 2 seconds, and the tension value of the tension sensor 34 is recorded. If the angle tension is <35N (standard value 50N×70%), it is determined that the magnet is missing and an alarm is triggered. The base 44 is replaced and the PLC parameters are adjusted to adapt to different specifications of rotors.

[0023] In summary, this automated magnet detection device for the internal magnets of a motor rotor based on mechanical tension achieves the following: the rotor is installed into the inner cavity of the V-groove on the base 44, then the pneumatic clamping cylinder 45 clamps the outer wall of the rotor, the positioning pin 46 on the base 44 is inserted into the end hole of the rotor, the horizontal drive module 31 extends to move the electromagnetic detection probe 33 to the center of the rotor's inner cavity, the electromagnetic detection probe 33 is powered on, the servo motor 42 rotates sequentially through the indexing plate 43, stops at multiple angles, and records the tension value. If the tension at a certain angle does not meet the requirements, it is determined that a magnet is missing and an alarm is triggered. This achieves the goal of low-cost, high-precision, and highly anti-interference magnet assembly detection by combining indexing rotation with an electromagnetic probe.

Claims

1. An automated detection device for the internal magnets of a motor rotor based on mechanical tension, characterized in that, The system includes a PLC control system (2), a magnet detection assembly (3), and a rotor rotation fixing assembly (4) mounted on a base plate (1). The magnet detection assembly (3) includes a horizontal drive module (31) mounted on the top of the base plate (1). A micrometer adjustment platform (32) is fixedly mounted on the moving end of the horizontal drive module (31). Three electromagnetic detection probes (33) are installed on the micrometer adjustment platform (32). A tension sensor (34) is provided on one side of each electromagnetic detection probe (33). The rotor rotation fixing assembly (4) The system includes a stabilizing bracket (41) fixedly mounted on a base plate (1), a servo motor (42) fixedly mounted on the bottom of the base plate (1), an indexing plate (43) mounted on the top of the base plate (1), the output shaft of the servo motor (42) being mounted on the indexing plate (43), a base (44) mounted on the top of the indexing plate (43), two symmetrical positioning pins (46) being provided on the top of the base (44), a pneumatic clamping cylinder (45) being mounted on the top of the indexing plate (43) platform, and an alarm being provided on the PLC control system (2).

2. The automated detection device for the internal magnets of a motor rotor based on mechanical tension according to claim 1, characterized in that, The base (44) has a V-shaped groove on its top, and a polyurethane anti-slip pad is embedded in the V-shaped groove.

3. The automated detection device for the internal magnets of a motor rotor based on mechanical tension according to claim 2, characterized in that, The electromagnetic detection probe (33) has 550 coil turns and an operating current of 0.5A.

4. The automated detection device for the internal magnets of a motor rotor based on mechanical tension according to claim 3, characterized in that, The positioning pin (46) is circumferentially zero-position aligned with the process hole on the rotor end face.

5. The automated detection device for the internal magnets of a motor rotor based on mechanical tension according to claim 4, characterized in that, The indexing plate (43) is connected to an absolute encoder with an angular resolution of ≤0.01° and a repeatability of ±0.1°.

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