A stator and rotor dynamic balance detection device and method

Abstract

The present invention discloses a stator and rotor dynamic balance detection device and method, which are applied to rotor dynamic balance detection. The stator comprises: a stator core, the end face of the stator core is provided with a through hole along the axial direction, the through hole is suitable for accommodating a rotor and allowing the rotor to pass through, and the end face of the stator core is also provided with a notch, the notch is suitable for connecting the through hole with the outside atmosphere; a stator winding, the stator winding is wound on the stator core, and the stator winding generates an unevenly distributed rotating magnetic field along the circumferential direction after power is turned on, so that the rotor rotates under the action of the rotating magnetic field; after the stator core is built-in with the rotor, the reflective mark on the rotor is exposed through the notch during the rotation process. The rotor of the present invention rotates by using a rotating magnetic field, the rotor has no contact with the stator core and the stator winding, the rotor will not touch the stator core and the stator winding, and then the rotation of the rotor will not be affected by the stator core and the stator winding, and the rotation of the rotor will not introduce equipment errors, thereby improving the measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of rotor balance detection, and in particular to a stator and rotor dynamic balance detection device and method. Background Art

[0002] An unbalanced rotor will generate centrifugal force when it rotates, causing the motor to vibrate. These vibrations will not only affect the smoothness of the motor's operation, but also generate additional noise. Through dynamic balancing testing, vibration and noise can be significantly reduced, and the running quality of the motor can be improved. A well-balanced rotor can also significantly reduce the wear of bearings, shafts and other related parts. Therefore, it is very important to perform dynamic balancing on the rotor on the motor.

[0003] During the manufacturing process, the dynamic balancing test of the rotor is usually completed before the rotor is assembled, and the rotor is placed alone on a special dynamic balancing test bench for testing. The general process of conventional rotor dynamic balancing test is as follows: add reflective marks on the surface of the rotor, and set a flash probe above the rotor to aim at the reflective mark. The rotor to be tested is placed on a test bench with vibration sensors at both ends. The belt is wrapped around the rotor to be tested, and the motor drives the belt to rotate, thereby driving the rotor to rotate. When the reflective mark on the rotor to be tested shows dynamic stillness under the flashing light of the flash probe, the vibration sensor transmits the signal to the data processor of the dynamic balancing equipment, and displays the imbalance, position and speed of the two ends of the rotor to be tested on the instrument.

[0004] Because the rotor is driven by the belt, and the belt drive itself has unbalance errors, these unbalance errors will affect the final rotor dynamic balance test results. For example, if the belt speed is too high, the vibration will be large, and the vibration of the belt will be transmitted to the rotor, resulting in measurement errors. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of measurement error in the current rotor dynamic balance detection method, thereby providing a stator and rotor dynamic balance detection device and method.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A stator is used for rotor dynamic balance detection, and comprises:

[0008] A stator core, wherein an end surface of the stator core is provided with a through hole extending therethrough in the axial direction, the through hole being suitable for accommodating the rotor and allowing the rotor to pass therethrough, and the end surface of the stator core is also provided with a notch parallel to the axis of the stator core, the notch being suitable for connecting the through hole with the outside atmosphere;

[0009] The stator winding is wound on the stator core and generates a non-uniformly distributed rotating magnetic field along the circumferential direction after being energized, so that the rotor rotates under the action of the rotating magnetic field;

[0010] After the stator core is internally mounted with the rotor, the reflective mark on the rotor is exposed through the notch during the rotation of the rotor.

[0011] To further optimize the technical solution, the stator core is coaxially arranged with the rotor; the minimum inner diameter of the stator core is greater than the maximum outer diameter of the rotor, so that the rotor can be placed axially into the through hole of the stator core.

[0012] To further optimize the technical solution, after the stator core is internally installed with the rotor, an air gap space is provided between the outer wall of the rotor and the inner wall of the stator core.

[0013] To further optimize the technical solution, the minimum size of the notch is larger than the maximum size of the rotor, so that the rotor can be placed from the notch into the through hole of the stator core.

[0014] To further optimize the technical solution, a plurality of wire slots parallel to the axis of the stator core are provided on the end surface of the stator core, and each of the wire slots is arranged in an arc direction avoiding the notch;

[0015] The stator winding includes a U-phase winding, a V-phase winding and a W-phase winding, each of which includes a plurality of windings, and each winding is wound in two wire slots;

[0016] The U-phase winding, the V-phase winding and the W-phase winding are not 120° electrical angle apart from each other.

[0017] Further optimizing the technical solution, the electrical angle between the U-phase winding and the V-phase winding is 135°, the electrical angle between the V-phase winding and the W-phase winding is 135°, and the electrical angle between the U-phase winding and the W-phase winding is 90°;

[0018] And / or, the U-phase winding, the V-phase winding and the W-phase winding are connected in star connection or in triangle connection.

[0019] A rotor dynamic balance detection device, comprising:

[0020] Stator positioning bracket;

[0021] The stator is arranged on a stator positioning bracket;

[0022] Two rotor positioning brackets are respectively arranged on both sides of the stator positioning bracket;

[0023] A rotor, wherein the rotor is rotatably arranged on a rotor positioning bracket, the rotor is coaxially arranged with the stator, and a reflective mark is arranged on the rotor;

[0024] A flash probe, which is arranged above the stator and is used to emit bright light to the rotor;

[0025] A photoelectric sensor, the photoelectric sensor is arranged above the stator, and the photoelectric sensor is used to receive reflected light from the reflective mark to capture the position of the reflective mark;

[0026] Two vibration sensors are respectively arranged on the rotor positioning bracket to detect the unbalance at both ends of the rotor when it rotates;

[0027] A data processor is used to receive detection information from the photoelectric sensor and the vibration sensor.

[0028] Further optimizing the technical solution, the top of the stator positioning bracket is provided with a first arc-shaped groove, the outer side wall of the stator core of the stator is provided with a second arc-shaped groove, and the second arc-shaped groove is adapted to the first arc-shaped groove;

[0029] And / or, a stepped hole is provided through the top of the side wall of the rotor positioning bracket, a bearing is placed in the stepped hole, and the rotor is rotatably arranged on the rotor positioning bracket through the bearing; a notch is provided at the top of the rotor positioning bracket, and the notch is connected to the stepped hole.

[0030] A rotor dynamic balance detection method, the method is based on the rotor dynamic balance detection device, and comprises the following steps:

[0031] Positioning the stator and rotor;

[0032] When the stator is energized, an unevenly distributed rotating magnetic field is generated along the circumferential direction, and the rotor rotates under the action of the rotating magnetic field;

[0033] Bright light is emitted to the rotor through the flash probe, and the position of the reflective mark is detected in real time through the photoelectric sensor; when the reflective mark on the rotor shows dynamic stillness under the flashing light of the flash probe, the two vibration sensors respectively feed back the detection signals to the data processor.

[0034] To further optimize the technical solution, the positioning of the stator and the rotor comprises the following steps:

[0035] Place the rotor into the stator through the notch of the stator, or insert the rotor into the stator along the axial direction of the stator, position the stator on the stator positioning bracket, and position the rotor on the rotor positioning bracket;

[0036] Alternatively, the stator is first positioned on the stator positioning bracket, and then the rotor is placed inside the stator through the gap of the stator, and then the rotor is positioned on the rotor positioning bracket.

[0037] To further optimize the technical solution, the method adjusts the voltage frequency input to the stator based on the rotor speed detection requirement to adjust the speed during the rotor dynamic balance detection.

[0038] The technical solution of the present invention has the following advantages:

[0039] 1. The present invention provides a stator, in which after the rotor is built into the stator core, the reflective mark on the rotor is exposed through the gap during the rotation process, so that the reflective mark can be normally set on the outer wall of the rotor, and the reflective mark and the flash probe are used to cooperate with each other to determine whether the rotor is in a dynamic static state. The stator winding can generate an unevenly distributed rotating magnetic field along the circumferential direction, and the rotor can rotate under the action of the rotating magnetic field, thereby realizing the dynamic balance detection of the rotor.

[0040] Because the rotor rotates by using the rotating magnetic field, the rotor has no contact with the stator core and the stator winding, and the rotor will not touch the stator core and the stator winding, and the rotation of the rotor will not be affected by the stator core and the stator winding, and the rotation of the rotor will not introduce equipment errors, which improves the measurement accuracy. And by increasing the voltage frequency of the stator winding, the rotor can be rotated at a high speed, so that the rotor can be normally tested for dynamic balance under high-speed conditions.

[0041] 2. The present invention provides a stator, wherein the stator core is coaxially arranged with the rotor. The minimum inner diameter of the stator core is greater than the maximum outer diameter of the rotor, so that the rotor can be placed axially into the through hole of the stator core, which is convenient for assembling the rotor, and enables the stator core to adapt to a large-sized rotor, thereby enhancing the adaptability of the stator core.

[0042] The minimum size of the notch is larger than the maximum size of the rotor, so that the rotor can be placed from the notch into the through hole of the stator core, so that the stator core can adapt to the rotor with a small size, thereby enhancing the adaptability of the stator core.

[0043] 3. The present invention provides a stator, in which after the rotor is built into the stator core, there is an air gap between the outer wall of the rotor and the inner wall of the stator core. On the one hand, there is no direct mechanical contact between the rotor and the stator core, thus avoiding the situation where the rotor and the stator core are in contact with each other. On the other hand, the air gap can absorb part of the vibration energy, reduce the mechanical vibration between the rotor and the stator, and improve the accuracy of the detection; a larger air gap will reduce the air gap magnetic flux density, and the magnetic field will leak less, which helps to reduce vibration.

[0044] 4. The present invention provides a rotor dynamic balance detection device, which occupies a small space and has a compact structure. It can directly use the rotating magnetic field generated by the stator to drive the rotor to rotate. When the rotor rotates, its two ends are respectively rotated and set on the rotor positioning bracket, and the vibration information of the two ends of the rotor is detected by the vibration sensor set at the position of the rotor positioning bracket. Because the stator and the rotor are not in contact, equipment errors will not be introduced, and the information detected by the vibration sensor is more accurate.

[0045] 5. The present invention provides a rotor dynamic balance detection method, which can accurately detect the imbalance amount and position of the rotor by combining a rotating magnetic field, a flash probe, a photoelectric sensor and a vibration sensor, and analyze and process them through a data processor, and then take corresponding measures to eliminate the imbalance. The rotor after balancing adjustment can not only improve the stability of the subsequent operation of the rotor, but also reduce vibration and noise, thereby extending the service life of the equipment.

[0046] 6. The present invention provides a rotor dynamic balancing detection method, which adjusts the voltage frequency input to the stator based on the rotor speed detection requirement, and then adjusts the speed during the rotor dynamic balancing detection, so that the rotor can meet the dynamic balancing detection requirements at different speeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 A schematic diagram of the structure of a stator provided by the present invention;

[0049] Figure 2 A schematic diagram of the structure of a stator slot provided by the present invention;

[0050] Figure 3 A planar expansion diagram of a stator winding of a stator provided by the present invention when it is wound on a wire slot;

[0051] Figure 4 A star vector diagram of a U-phase winding, a V-phase winding and a W-phase winding of a stator provided by the present invention;

[0052] Figure 5 A schematic diagram of the structure of a rotor dynamic balance detection device provided by the present invention from a first perspective;

[0053] Figure 6A schematic diagram of the structure of a rotor dynamic balance detection device provided by the present invention from a second viewing angle;

[0054] Figure 7 A schematic structural diagram of a rotor dynamic balance detection device provided by the present invention when the stator and the rotor are not positioned.

[0055] Reference numerals:

[0056] 100, stator, 101, stator core, 102, stator winding, 103, notch, 104, lead wire, 105, through hole, 106, wire slot, 107, first arc-shaped groove;

[0057] 200, rotor;

[0058] 300, stator positioning bracket, 301, second arc-shaped groove;

[0059] 400, rotor positioning bracket, 401, notch, 402, stepped hole, 4021, first stepped hole, 4022, second stepped hole;

[0060] 500, bearings;

[0061] 600, vibration sensor;

[0062] 700. Fixed platform. DETAILED DESCRIPTION

[0063] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0065] An unbalanced rotor will generate centrifugal force when it rotates, causing the motor to vibrate. These vibrations will not only affect the smoothness of the motor's operation, but also generate additional noise. Through dynamic balancing testing, vibration and noise can be significantly reduced, and the running quality of the motor can be improved. A well-balanced rotor can also significantly reduce the wear of bearings, shafts and other related parts. Therefore, it is very important to perform dynamic balancing on the rotor on the motor.

[0066] During the manufacturing process, the dynamic balancing test of the rotor is usually completed before the rotor is assembled, and the rotor is placed alone on a special dynamic balancing test bench for testing. The general process of conventional rotor dynamic balancing test is as follows: add reflective marks on the surface of the rotor, and set a flash probe above the rotor to aim at the reflective mark. The rotor to be tested is placed on a test bench with vibration sensors at both ends. The belt is wrapped around the rotor to be tested, and the motor drives the belt to rotate, thereby driving the rotor to rotate. When the reflective mark on the rotor to be tested shows dynamic stillness under the flashing light of the flash probe, the vibration sensor transmits the signal to the data processor of the dynamic balancing equipment, and displays the imbalance, position and speed of the two ends of the rotor to be tested on the instrument.

[0067] Because the rotor is driven by the belt, and the belt drive itself has unbalance errors, these unbalance errors will affect the final rotor dynamic balance test results. Conventional test methods can only adjust the speed within a small range, generally around 1000rpm. If the belt speed is too high, the vibration will be very large, and the vibration of the belt will be transmitted to the rotor, resulting in measurement errors; the belt wears quickly, and the friction between the belt and the rotor cannot provide the torque required at high speeds, causing slippage, making it impossible to detect the rotor at high speeds. If the pulley itself is unbalanced, it will also be transmitted to the rotor, resulting in measurement errors. If the tension of the belt is inconsistent, additional vibration will be generated during operation, affecting the measurement results.

[0068] Based on this, the invention provides a stator and rotor dynamic balance detection device and method, which positions the rotor inside a stator with an opening, and uses the non-uniform rotating magnetic field in the circumferential direction generated by the stator to drive the rotor to rotate, thereby not introducing equipment errors, thereby ensuring the accuracy of the rotor dynamic balance detection.

[0069] The specific embodiments of the present invention are described in detail below in conjunction with the stator of the first aspect, the rotor dynamic balance detection device of the second aspect, and the rotor dynamic balance detection method of the third aspect.

[0070] Example 1

[0071] Combination Figures 1 to 4 As shown, in a first aspect, this embodiment provides a stator for use in rotor dynamic balance detection, including a stator core 101 and a stator winding 102 .

[0072] The end surface of the stator core 101 is provided with a through hole 105 extending axially therethrough, and the through hole 105 is suitable for accommodating the rotor 200 and allowing the rotor 200 to pass therethrough. The end surface of the stator core 101 is also provided with a notch 103 parallel to the axis of the stator core, and the notch 103 is suitable for connecting the through hole 105 with the outside atmosphere. The notch 103 enables the bright light emitted by the flash probe to illuminate the reflective mark of the rotor 200, and the photoelectric sensor can detect the reflective mark of the rotor 200 through the notch 103.

[0073] The stator winding 102 is wound on the stator core 101. When powered on, the stator winding 102 generates an unevenly distributed rotating magnetic field in the circumferential direction, so that the rotor 200 rotates under the rotating magnetic field. The rotating magnetic field means that the direction and intensity of the magnetic field will change continuously with the change of time, thereby forming a magnetic field rotating around the stator.

[0074] After the rotor 200 is built into the stator core 101, the reflective mark on the rotor 200 is exposed through the notch 103 during the rotation process, and then the reflective mark can be normally set on the outer wall of the rotor 200, and the reflective mark and the flash probe can be used to cooperate with each other to determine whether the rotor 200 is in a dynamic static state. The stator winding 102 can generate an unevenly distributed rotating magnetic field along the circumferential direction, and the rotor 200 can rotate under the action of the rotating magnetic field, thereby realizing the dynamic balance detection of the rotor 200. Because the rotor 200 rotates by using the rotating magnetic field, the rotor 200 has no contact with the stator core 101 and the stator winding 102, and the rotor 200 will not touch the stator core 101 and the stator winding 102, and then the rotation of the rotor 200 will not be affected by the stator core 101 and the stator winding 102, and the rotation of the rotor 200 will not introduce equipment errors, thereby improving the measurement accuracy. Furthermore, by increasing the voltage frequency of the stator winding 102 , the rotor 200 can be made to rotate at a high speed, so that the rotor 200 can normally perform dynamic balancing detection under high-speed working conditions.

[0075] It should be noted that although the present embodiment generates a circumferentially non-uniform rotating magnetic field, since the dynamic balance detection of the rotor 200 is not connected to a load, the torque required for the rotation of the rotor 200 is very small, and the circumferentially non-uniform rotating magnetic field can also be used to drive the rotor 200 to rotate. When the rotor 200 rotates, the flash probe and the photoelectric sensor can be used to cooperate with each other to accurately lock the state of the rotor at a specific position, which is the dynamic static state of the rotor, and then the vibration detection of the rotor 200 can be performed normally in the dynamic static state of the rotor.

[0076] In some embodiments, the stator core 101 is coaxially arranged with the rotor 200. The minimum inner diameter of the stator core 101 is greater than the maximum outer diameter of the rotor 200, so that the rotor 200 can be placed in the through hole 105 of the stator core 101 along the axial direction, which is convenient for the assembly of the rotor 200. In addition, for a rotor 200 with a larger diameter that cannot be placed in the stator core 101 from the notch 103, the rotor 200 can be directly placed in the stator core 101 along the axial direction of the stator core 101, so that the stator core 101 in this embodiment can adapt to the rotor 200 with a large size, thereby enhancing the adaptability of the stator core 101.

[0077] In some embodiments, after the rotor 200 is built into the stator core 101, there is an air gap between the outer wall of the rotor 200 and the inner wall of the stator core 101. On the one hand, there is no direct mechanical contact between the rotor 200 and the stator core 101, avoiding the situation where the rotor 200 and the stator core 101 are in contact with each other. The air gap can absorb part of the vibration energy, reduce the mechanical vibration between the rotor 200 and the stator 100, and improve the accuracy of the detection; a larger air gap will reduce the air gap magnetic flux density, and the magnetic field will leak less, which helps to reduce vibration.

[0078] In some embodiments, the minimum size of the notch 103 is greater than the maximum size of the rotor 200, so that the rotor 200 can be placed from the notch 103 into the through hole 105 of the stator core 101. In this embodiment, for a rotor 200 with a smaller outer diameter, the rotor 200 can be directly placed from the notch 103 of the rotor 200 into the stator core 101, so that the stator core 101 in this embodiment can adapt to the rotor 200 with a smaller size, thereby enhancing the adaptability of the stator core 101.

[0079] In some embodiments, a plurality of wire slots 106 parallel to the axis of the stator core are provided on the end surface of the stator core 101, and each wire slot 106 is arranged in an arc direction avoiding the notch 103. The stator winding 102 includes a U-phase winding, a V-phase winding, and a W-phase winding, and the U-phase winding, the V-phase winding, and the W-phase winding each include a plurality of windings, and each winding is respectively wound in two wire slots 106. The U-phase winding, the V-phase winding, and the W-phase winding are not 120° electrical angle apart from each other.

[0080] The present embodiment is described below by taking the example of 18 wire slots 106. Figure 2 As shown, 18 wire grooves 106 are arranged along the arc line.

[0081] The U-phase winding includes three U-phase windings, one U-phase winding sequentially passes through the No. 1 slot and the No. 12 slot, one U-phase winding sequentially passes through the No. 2 slot and the No. 11 slot, and one U-phase winding sequentially passes through the No. 3 slot and the No. 10 slot. Among them, the U-phase winding arranged in the No. 3 slot is connected to the U1 lead-out terminal, and the U-phase winding arranged in the No. 12 slot is connected to the U2 lead-out terminal.

[0082] The V-phase winding includes three V-phase windings, one V-phase winding sequentially passes through the No. 4 wire slot and the No. 15 wire slot, one V-phase winding sequentially passes through the No. 5 wire slot and the No. 14 wire slot, and one V-phase winding sequentially passes through the No. 6 wire slot and the No. 13 wire slot. Among them, the V-phase winding arranged in the No. 13 wire slot is connected to the V1 lead-out terminal, and the V-phase winding arranged in the No. 6 wire slot is connected to the V2 lead-out terminal.

[0083] The W-phase winding includes three W-phase windings, one W-phase winding sequentially passes through the No. 7 slot and the No. 18 slot, one W-phase winding sequentially passes through the No. 8 slot and the No. 17 slot, and one W-phase winding sequentially passes through the No. 9 slot and the No. 16 slot. Among them, the W-phase winding arranged in the No. 9 slot is connected to the W1 lead-out terminal, and the W-phase winding arranged in the No. 18 slot is connected to the W2 lead-out terminal.

[0084] Combination Figure 3 As shown, the U2 lead-out terminal of the U-phase winding, the V2 lead-out terminal of the V-phase winding, and the W2 lead-out terminal of the W-phase winding are connected together to form a star connection (Y-type connection). Under this connection mode, the U1 lead-out terminal, the V1 lead-out terminal, and the W1 lead-out terminal are respectively the connection terminals and are connected to the lead-out wire 104.

[0085] If no notch is provided on the stator core 101, 24 wire slots will be provided on the stator core 101. In this embodiment, since a notch is provided on the stator core 101, the notch occupies 6 wire slots, so that there are 18 wire slots arranged. The mechanical angle of each wire slot is 15°, and the electrical angle of each wire slot is 15°.

[0086] Combination Figure 4 In the star-shaped vector diagram shown, the magnetic field strength of the three phases UVW in space is generated by three windings, so the magnitude is consistent. Although the distribution in space is not 120° electrical angle, it can still generate a rotating magnetic field with uneven spatial distribution and drive the rotor to work. More specifically, the electrical angle between the U-phase winding and the V-phase winding is 135°, the electrical angle between the V-phase winding and the W-phase winding is 135°, and the electrical angle between the U-phase winding and the W-phase winding is 90°.

[0087] Because the torque that the stator needs to generate is relatively small, it only drives a rotor to rotate at no load, and the air gap is large, the air gap flux seal can be designed to be very low, so the vibration generated by the uneven air gap during normal operation is not large.

[0088] As an alternative embodiment, the U-phase winding, the V-phase winding and the W-phase winding are connected in a triangle. Specifically, the method is: the end of the U-phase winding (U2 lead end) is connected to the beginning of the V-phase winding (V1 lead end), the end of the V-phase winding (V2 lead end) is connected to the beginning of the W-phase winding (W1 lead end), and the end of the W-phase winding (W2 lead end) is connected to the beginning of the U-phase winding (U1 lead end), forming a triangle connection (Δ-type connection).

[0089] Example 2

[0090] Combination Figures 1 to 7 As shown, in the second aspect, this embodiment provides a rotor dynamic balance detection device, including a stator positioning bracket 300, a stator 100, a rotor positioning bracket 400, a rotor 200, a flash probe, a photoelectric sensor, a vibration sensor 600 and a data processor.

[0091] The stator 100 is disposed on the stator positioning bracket 300 .

[0092] Two rotor positioning brackets 400 are provided and are arranged on both sides of the stator positioning bracket 300 respectively.

[0093] The rotor 200 is rotatably disposed on the rotor positioning bracket 400 . The rotor 200 is coaxially arranged with the stator. A reflective mark is disposed on the rotor 200 .

[0094] The flash probe is arranged above the stator, and is used for emitting bright light to the rotor 200 .

[0095] The photoelectric sensor is arranged above the stator, and is used for receiving reflected light of the reflective mark to capture the position of the reflective mark.

[0096] Two vibration sensors 600 are provided, which are respectively provided on the rotor positioning bracket 400, and are used to detect the unbalance amount at both ends of the rotor 200 when the rotor 200 rotates. A rectangular groove is provided on the side wall of the rotor positioning bracket 400 for placing the vibration sensor 600.

[0097] The output end of the photoelectric sensor and the output end of the vibration sensor 600 are respectively connected to the input end of the data processor, and the data processor is used to receive detection information of the photoelectric sensor and the vibration sensor 600 .

[0098] The flash probe and photoelectric sensor work together. When the reflective mark passes the flash probe, the photoelectric sensor detects the reflected light signal. The flash frequency of the flash probe is synchronized with the rotation frequency of the rotor, so that the position of the reflective mark can be captured every time the flash occurs.

[0099] The above rotor dynamic balance detection device can directly use the rotating magnetic field generated by the stator 100 to drive the rotor 200 to rotate. When the rotor 200 rotates, its two ends are respectively rotated and set on the rotor positioning bracket 400, and the vibration information of the two ends of the rotor 200 is detected by the vibration sensor 600 set at the position of the rotor positioning bracket 400. Because the stator 100 and the rotor 200 are not in contact, equipment errors will not be introduced, and the information detected by the vibration sensor 600 is more accurate.

[0100] The bottom ends of the stator positioning bracket 300 and the rotor positioning bracket 400 are both fixedly disposed on a horizontally disposed fixed platform 700 .

[0101] In some embodiments, the top of the stator positioning bracket 300 is provided with a first arc-shaped groove 107, and the outer side wall of the stator core 101 of the stator is provided with a second arc-shaped groove 301, and the second arc-shaped groove 301 is adapted to the first arc-shaped groove 107. When the stator 100 is positioned, the stator 100 can be directly clamped and positioned in the second arc-shaped groove 301, so as to ensure the positioning stability of the stator 100.

[0102] In some embodiments, in combination Figure 7 As shown, a stepped hole 402 is provided through the top of the side wall of the rotor positioning bracket 400, and a bearing 500 is accommodated in the stepped hole 402. More specifically, the stepped hole 402 includes a first stepped hole 4021 and a second stepped hole 4022, the first stepped hole 4021 is close to the outer side wall of the rotor positioning bracket 400, the second stepped hole 4022 is close to the inner side wall of the rotor positioning bracket 400, the aperture of the first stepped hole 4021 is larger than the aperture of the second stepped hole 4022, and the bearing 500 is accommodated in the first stepped hole 4021.

[0103] The top of the rotor positioning bracket 400 is provided with a notch 401, which is communicated with the stepped hole 402. The notch 401 provided in this embodiment facilitates the rotor 200 to be inserted into the stepped hole 402 from the top.

[0104] The rotor 200 is rotatably arranged on the rotor positioning bracket 400 through the bearing 500. After the rotor 200 is placed inside the stepped hole 402, the bearing 500 is embedded in the first stepped hole 4021 from the outside of the rotor positioning bracket 400, thereby completing the positioning of the end of the rotor 200.

[0105] Example 3

[0106] In a third aspect, this embodiment provides a rotor dynamic balance detection method, which is based on a rotor dynamic balance detection device and includes the following steps:

[0107] S1. Positioning the stator 100 and the rotor 200.

[0108] In step S1, the stator 100 and the rotor 200 are positioned, including the following steps:

[0109] The rotor 200 is placed inside the stator 100 through the notch 103 of the stator 100, the stator 100 is positioned on the stator positioning bracket 300, and the rotor 200 is positioned on the rotor positioning bracket 400. As an alternative embodiment, the rotor 200 is inserted into the inside of the stator 100 along the axial direction of the stator 100, the stator 100 is positioned on the stator positioning bracket 300, and the rotor 200 is positioned on the rotor positioning bracket 400. As an alternative embodiment, the stator 100 is first positioned on the stator positioning bracket 300, and then the rotor 200 is placed inside the stator 100 through the notch 103 of the stator 100, and then the rotor 200 is positioned on the rotor positioning bracket 400.

[0110] The steps of positioning the rotor 200 on the rotor positioning bracket 400 are as follows: after the rotor 200 is placed inside the stepped hole 402, the bearing 500 is embedded into the first stepped hole 4021 from the outside of the rotor positioning bracket 400, and the inner ring of the bearing 500 is embedded on the rotating shaft of the rotor 200, so as to complete the positioning of the rotor 200. After the bearing 500 is completed, the central axis of the rotor 200 is collinear with the central axis of the stator 100.

[0111] S2. The stator 100 is energized to generate an unevenly distributed rotating magnetic field along the circumferential direction, and the rotor 200 rotates under the action of the rotating magnetic field.

[0112] In step S2, since many precision rotors work at high speed, the dynamic balance requirements of the rotor at high speed are very high. And some rotors need to detect their dynamic balance at low speed. In order to make the above-mentioned rotor dynamic balance detection method meet both the dynamic balance detection requirements of the rotor at high speed and the dynamic balance detection requirements of the rotor at low speed. This embodiment is based on the speed detection requirements of the rotor 200, and the voltage frequency input to the stator 100 is adjusted, and then the speed of the rotor 200 during the dynamic balance detection is adjusted, so that the rotor 200 can meet the dynamic balance detection requirements at different speeds. When the voltage frequency input to the stator 100 is increased, the speed of the rotor being tested can be easily increased, and the maximum speed can reach 10000rpm.

[0113] S3. The flash probe emits bright light to the rotor 200, and the photoelectric sensor detects the position of the reflective mark in real time. When the reflective mark on the rotor 200 shows dynamic stillness under the flashing light of the flash probe, the two vibration sensors 600 respectively feed back the detection signals to the data processor.

[0114] The specific steps of step S3 are:

[0115] Flash detection: The flash probe flashes at a set frequency, and the photoelectric sensor captures the position of the reflective mark.

[0116] Vibration signal collection: The vibration sensor 600 collects vibration signals of the rotor at different positions in real time.

[0117] Data processing: The data processor synchronously processes the data from the flash probe and the vibration sensor 600 to determine the speed, phase and vibration characteristics of the rotor.

[0118] Unbalance calculation: Calculate the imbalance of the rotor at each position based on the vibration signal and phase information.

[0119] Results show: The display screen of the dynamic balancing equipment shows information such as the rotor's imbalance, position and speed.

[0120] The above-mentioned rotor dynamic balancing detection method, by combining a rotating magnetic field, a flash probe, a photoelectric sensor and a vibration sensor 600, can accurately detect the imbalance amount and position of the rotor, and analyze and process them through a data processor, and then corresponding measures can be taken to eliminate the imbalance. The rotor after balancing adjustment can not only improve the stability of the subsequent operation of the rotor, but also reduce vibration and noise, thereby extending the service life of the equipment.

[0121] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A stator, characterized in that: The stator is applied to rotor dynamic balance detection, and the stator comprises: A stator core (101), wherein an end surface of the stator core (101) is provided with a through hole (105) extending therethrough in the axial direction, the through hole (105) being suitable for accommodating a rotor (200) and allowing the rotor (200) to pass therethrough, and the end surface of the stator core (101) is further provided with a notch (103) parallel to the axis of the stator core, the notch (103) being suitable for connecting the through hole (105) with the outside atmosphere; A stator winding (102), the stator winding (102) being wound on the stator core (101), and the stator winding (102) generating an unevenly distributed rotating magnetic field along the circumferential direction after being energized, so that the rotor (200) rotates under the action of the rotating magnetic field; After the rotor (200) is built into the stator core (101), the reflective mark on the rotor (200) is exposed through the notch (103) during the rotation process.

2. The stator according to claim 1, characterized in that: The stator core (101) and the rotor (200) are coaxially arranged; the minimum inner diameter of the stator core (101) is greater than the maximum outer diameter of the rotor (200), so that the rotor (200) can be placed axially inside the through hole (105) of the stator core (101).

3. The stator according to claim 2, characterized in that: After the rotor (200) is built into the stator core (101), an air gap space is provided between the outer wall of the rotor (200) and the inner wall of the stator core (101).

4. The stator according to claim 1, characterized in that: The minimum size of the notch (103) is greater than the maximum size of the rotor (200), so that the rotor (200) can be placed from the notch (103) into the through hole (105) of the stator core (101).

5. The stator according to any one of claims 1 to 4, characterized in that: A plurality of wire slots (106) parallel to the axis of the stator core (101) are provided on the end surface of the stator core, and each of the wire slots (106) is arranged in an arc direction avoiding the notch (103); The stator winding (102) comprises a U-phase winding, a V-phase winding and a W-phase winding, wherein the U-phase winding, the V-phase winding and the W-phase winding respectively comprise a plurality of windings, and each winding is respectively wound in two wire slots (106); The U-phase winding, the V-phase winding and the W-phase winding are not 120° electrical angle apart from each other.

6. The stator according to claim 5, characterized in that: The electrical angle between the U-phase winding and the V-phase winding is 135°, the electrical angle between the V-phase winding and the W-phase winding is 135°, and the electrical angle between the U-phase winding and the W-phase winding is 90°; And / or, the U-phase winding, the V-phase winding and the W-phase winding are connected in star connection or in triangle connection.

7. A rotor dynamic balance detection device, characterized in that: include: Stator positioning bracket (300); The stator (100) according to any one of claims 1 to 6, wherein the stator (100) is arranged on a stator positioning bracket (300); Two rotor positioning brackets (400) are respectively arranged on both sides of the stator positioning bracket (300); A rotor (200), the rotor (200) being rotatably disposed on a rotor positioning bracket (400), the rotor (200) being coaxially arranged with the stator, and a reflective mark being disposed on the rotor (200); a flash probe, the flash probe being arranged above the stator and being used to emit bright light to the rotor (200); A photoelectric sensor, the photoelectric sensor is arranged above the stator, and the photoelectric sensor is used to receive reflected light from the reflective mark to capture the position of the reflective mark; Two vibration sensors (600) are respectively arranged on the rotor positioning bracket (400) and are used to detect the unbalance amount at both ends of the rotor (200) when the rotor (200) rotates; A data processor is used to receive detection information from the photoelectric sensor and the vibration sensor (600).

8. The rotor dynamic balance detection device according to claim 7, characterized in that: A first arc-shaped groove (107) is provided at the top end of the stator positioning bracket (300), and a second arc-shaped groove (301) is provided on the outer side wall of the stator core (101) of the stator, wherein the second arc-shaped groove (301) is matched with the first arc-shaped groove (107); And / or, a stepped hole (402) is provided through the top of the side wall of the rotor positioning bracket (400), a bearing (500) is accommodated in the stepped hole (402), and the rotor (200) is rotatably arranged on the rotor positioning bracket (400) via the bearing (500); and a notch (401) is provided at the top end of the rotor positioning bracket (400), and the notch (401) is communicated with the stepped hole (402).

9. A rotor dynamic balance detection method, characterized in that: The method is performed based on the rotor dynamic balancing detection device according to claim 7 or 8, and comprises the following steps: Positioning the stator (100) and the rotor (200); The stator (100) is energized to generate an unevenly distributed rotating magnetic field in a circumferential direction, and the rotor (200) rotates under the action of the rotating magnetic field; Bright light is emitted to the rotor (200) through the flash probe, and the position of the reflective mark is detected in real time through the photoelectric sensor; when the reflective mark on the rotor (200) shows dynamic stillness under the flashing light of the flash probe, the two vibration sensors (600) respectively feed back detection signals to the data processor.

10. The rotor dynamic balance detection method according to claim 9, characterized in that: Positioning the stator (100) and the rotor (200) comprises the following steps: Placing the rotor (200) into the interior of the stator (100) through the notch (103) of the stator (100), or inserting the rotor (200) into the interior of the stator (100) along the axial direction of the stator (100), positioning the stator (100) on the stator positioning bracket (300), and positioning the rotor (200) on the rotor positioning bracket (400); Alternatively, the stator (100) is first positioned on the stator positioning bracket (300), and then the rotor (200) is placed inside the stator (100) through the notch (103) of the stator (100), and then the rotor (200) is positioned on the rotor positioning bracket (400).

11. The rotor dynamic balance detection method according to claim 9 or 10, characterized in that: The method adjusts the frequency of the voltage input to the stator (100) based on the rotation speed detection requirement of the rotor (200) so as to adjust the rotation speed of the rotor (200) during dynamic balancing detection.

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