A high-speed motor rotor dynamic balance test platform

Abstract

The application discloses a high-speed motor rotor dynamic balance test platform, which comprises a base platform base and pusher one, pusher two, a driving unit support, a supporting unit support one, a supporting unit support two, a driving unit, a supporting unit one, a supporting unit two, a displacement measuring device and a rotating speed measuring device arranged on the base platform base respectively. The application adopts an electromagnetic bearing as the supporting unit of the rotor, and the electromagnetic force can be obtained according to the current of the electromagnetic bearing and the air gap of the stator and rotor. The non-contact design reduces mechanical loss, compared with the traditional dynamic balancing machine, the mechanical wear of the bearing does not need to be considered, and the safety performance under the high-speed state is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of dynamic balancing testing of motor rotors, and particularly relates to a dynamic balancing test for high-speed motor rotors. Background Technology

[0002] A high-speed motor rotor is a high-speed rotating component with high requirements for high-speed dynamic response. It is prone to strong resonance at critical speeds, which can lead to the failure of the entire system. Therefore, it is necessary to control the unbalanced response to reduce the impact of vibration during high-speed rotation. Due to the limitations of the support mechanism of the dynamic balancing machine, the direct testing of the dynamic balancing performance of high-speed machinery is difficult and is affected by many factors, such as the influence of assembly process on the accuracy of dynamic balancing correction and the influence of clamping deformation.

[0003] During dynamic balancing testing, the rotor undergoes dynamic balancing detection and correction. During rotor rotation, the centrifugal inertial force generated by the unbalanced mass can cause vibrations in the mechanical device, shortening its lifespan. Therefore, it is essential to balance the rotor mass to achieve the permissible level of balance accuracy.

[0004] Existing dynamic balancing machines present significant challenges in directly testing the dynamic balancing performance at high speeds, and they do not consider the impact of assembly and clamping processes on dynamic balancing accuracy. The objective of this invention is to address these problems by directly testing the dynamic balancing performance of the rotor at high speeds, simulating the rotor's operating conditions within a motor. Summary of the Invention

[0005] In order to overcome the shortcomings of traditional diesel-electric hybrid propulsion systems, such as complex coupling devices for mechanical and electric propulsion, large size and weight, high vibration and noise, and complex switching between mechanical and electric propulsion and difficulty in fully utilizing energy, this invention provides a high-speed motor rotor dynamic balancing test platform.

[0006] The technical solution adopted by this invention to solve its technical problem is: a high-speed motor rotor dynamic balancing test platform, including a base platform and a propulsion device 1 and a propulsion device 2 respectively disposed on the left and right sides of the base platform. The propulsion device 1 is flexibly connected to a support unit bracket 1, and the propulsion device 2 is flexibly connected to a drive unit bracket. A drive unit is fixed on the drive unit bracket. A support unit bracket 2 is located between the support unit bracket 1 and the drive unit. Drive sliders are respectively disposed on the front and rear sides of the bottom of the support unit bracket 1, support unit bracket 2, and drive unit bracket. A slide rail adapted to the drive slider is disposed on the base platform. Support unit 1 and support unit 2, each composed of an electromagnetic bearing and an end cap, are respectively connected to the support unit bracket 1 and support unit 2. Support unit two, between support unit one and support unit two, is equipped with a displacement measuring device and a speed measuring device. The displacement measuring device includes a linear guide rail and a lower slider and an upper slider mounted on the linear guide rail. A sensor mounting block is mounted on the upper slider via a displacement sensor bracket, and a displacement sensor is mounted on the sensor mounting block. By adjusting the linear guide rail, the lower slider, and the upper slider, the axial position of the displacement sensor on the sensor bracket can be changed to test the unbalanced response of different measuring points on the rotor axis. The speed measuring device consists of a speed sensor bracket fixed on support unit one or support unit two and a speed sensor mounted on the speed sensor bracket. The speed sensor is directly opposite the rotor axis and is used to test the rotor speed.

[0007] The high-speed motor rotor dynamic balancing test platform has a propulsion device one connected to a support unit bracket one via a ball joint bearing, and a propulsion device two connected to a drive unit bracket via a ball joint bearing.

[0008] The aforementioned high-speed motor rotor dynamic balancing test platform uses non-contact electromagnetic bearings in its support unit bracket one and support unit bracket two.

[0009] The high-speed motor rotor dynamic balancing test platform described above also has a slider adjustment knob on its linear guide rail.

[0010] The displacement sensor of the high-speed motor rotor dynamic balancing test platform is an eddy current sensor.

[0011] The aforementioned high-speed motor rotor dynamic balancing test platform has linear guide rails and displacement sensor brackets respectively equipped with scales with a division value of 1mm and a total length of 1m.

[0012] The technical advantages of this invention are: the two support units of this invention are composed of electromagnetic bearings and end caps, which can simulate the working condition of the rotor installed in the motor, and take into account the influence of assembly process and clamping process on the dynamic balance performance of the rotor; the support force is directly read by using the parameters of electromagnetic bearings, which reduces the selection and arrangement process of mechanical sensors compared with traditional dynamic balancing machines.

[0013] This invention can simulate the working conditions after rotor assembly, taking into account the influence of assembly process and clamping deformation on dynamic balance performance; it can conduct dynamic balance performance tests on rotors at high speeds, testing the dynamic response and stability of rotors at high speeds; the drive unit bracket and support unit bracket are movable, allowing for dynamic balance tests on rotors of different lengths and shaft diameters. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a schematic diagram of the displacement measuring device of the present invention;

[0016] Figure 3 This is a schematic diagram of the displacement measuring device of the present invention;

[0017] Figure 4 This is a schematic diagram of the propulsion device of the present invention;

[0018] Figure 5 This is a schematic diagram of the speed sensor device of the present invention.

[0019] Explanation of markings in the diagram: 1—Base platform base, 10—Slide rail, 11—Ball joint bearing, 21—Propulsion device one, 22—Propulsion device two, 3—Drive unit bracket, 41—Support unit bracket one, 42—Support unit bracket two, 5—Drive unit, 61—Support unit one, 62—Support unit two, 7—Displacement measuring device, 71—Linear guide rail, 72—Displacement sensor bracket, 73—Lower slider, 74—Upper slider, 75—Sensor mounting block, 76—Displacement sensor, 77—Slider adjustment knob, 78 / 79—Scale, 8—Speed ​​measuring device, 81—Speed ​​sensor, 82—Speed ​​sensor bracket, 9—Motor rotor. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1As shown, this invention discloses a high-speed motor rotor dynamic balancing test platform, comprising a base platform 1 and a propulsion device 21, a propulsion device 22, a drive unit bracket 3, a support unit bracket 41, a support unit bracket 42, a drive unit 5, a support unit 61, a support unit 62, a displacement measuring device 7, and a speed measuring device 8, all respectively mounted on the base platform 1. Support units 61 and 62 consist of electromagnetic bearings and end caps. The drive unit 5 is a high-speed drive motor, specifically a non-drive type inductive stepper motor. This non-contact support characteristic reduces rotor mechanical losses. The electromagnetic bearings serve as rotor support units; electromagnetic force can be obtained based on the current in the electromagnetic bearings and the air gap between the stator and rotor. This non-contact design reduces mechanical losses, and compared to traditional dynamic balancing machines, it eliminates the need to consider bearing mechanical wear, thus improving safety performance at high speeds.

[0022] Specific examples Figure 1 As shown, propulsion device 1 21 and propulsion device 22 are fixed on the left and right sides of the base platform 1, respectively, and connected to the drive unit bracket 3 and the support unit bracket 1 41. The drive unit bracket 3 is equipped with a high-speed drive unit 5. Support unit 1 61 and support unit 2 62 are respectively connected to support unit bracket 1 41 and support unit 2 42. The positions of the drive unit 5 and support units 1 61 and 2 62 can be changed by adjusting the position of the drive unit bracket 3. Support unit bracket 1 41 and support unit bracket 2 42 use non-contact electromagnetic bearings; during testing, the rotor's supporting force can be read based on the current and displacement of the electromagnetic bearings.

[0023] Specific examples Figure 4 As shown, propulsion device 1 21 and propulsion device 2 22 are flexibly connected to drive unit bracket 3 and support unit bracket 1 41 respectively through ball joint bearing 11, to compensate for the coaxiality error of drive unit bracket 3 and support unit bracket 1 41 during propulsion, and to compensate for the radial deviation of the bracket during movement, so as to ensure the coaxiality of drive motor and support unit.

[0024] The base platform 1, support unit bracket 41, and drive unit bracket 3 are connected to the slide rail 10 via a drive slider. The support unit bracket 41 and drive unit bracket 3 move along the Z-direction via the slide rail 10. Preferably, an electric cylinder is used as the propulsion device, an induction motor as the high-speed drive unit, and a magnetic levitation bearing as the support unit. Depending on the rotor structure, the positions of the drive unit and support unit can be changed by adjusting the propulsion device to test the rotor's dynamic balance performance.

[0025] The displacement measuring device 7 includes a linear guide rail 71 and a lower slider 73 and an upper slider 74 that can slide relative to each other on the linear guide rail 71. A sensor mounting block 75 is mounted on the upper slider 74 via a displacement sensor bracket 72. A displacement sensor 76 is mounted on the sensor mounting block 75. By adjusting the linear guide rail 71, the lower slider 73, and the upper slider 74, the axial position of the displacement sensor 76 on the sensor bracket 72 can be changed to test the unbalanced response of the rotor at different axial measuring points. During the test, the radial runout displacement value of the rotor is read by the displacement sensor 76, specifically as follows: Figure 2 and Figure 3 As shown, the upper end face of the linear guide 71 and the displacement sensor bracket 72 are respectively provided with scales 78 and 79, with a graduation value of 1mm and a total length of 1m. The length of the linear guide 71 depends on the rotor length. The scale value 79 on the sensor bracket 72 is aligned with the side of the lower slider 73. The specific position of the displacement sensor bracket 72 in the Z direction can be determined by using the side of the lower slider 73 and the corresponding scale 78 on the linear guide 71. After the displacement sensor bracket 72 is initially positioned in the Z direction using the upper slider 74, the sensor is precisely positioned in the Z direction by fine-tuning the sensor. The slider adjustment knob 77 moves the displacement sensor bracket 72 to achieve initial positioning in the Y direction. The sensor mounting block 75 is fixed to the displacement sensor 76 by a threaded connection. The displacement sensor 76 is an eddy current sensor. The measurement linear range of the eddy current sensor is relatively small, and the threaded connection can achieve precise positioning in the Y direction. Since the sensor fixture cannot be adjusted in the X direction, the linear guide 71 can be fixed in a suitable position on the support by calculating the distance from the guide rail fixing fixture to the sensor probe and fixing the linear guide 71 in a suitable position on the support. This allows the sensor to be positioned in the X direction.

[0026] like Figure 5 As shown, the speed measuring device 8 consists of a speed sensor 81 fixed to a speed sensor bracket 82 mounted on a support unit bracket 41 or a support unit bracket 42. The speed sensor 81 faces the rotor shaft and is used to test the rotor speed. Based on the electromagnetic force of the electromagnetic bearing, the reading of the displacement sensor 76, and the reading of the speed sensor 81, the dynamic balance accuracy level and correction method of the rotor can be obtained. Specifically, the speed sensor 81 is mounted on the speed sensor bracket 82, and the speed sensor 81 and the speed sensor bracket 82 are connected by threads. Tightening the threads can adjust the distance between the speed sensor 81 probe and the rotor end face, ensuring the distance is within the sensor's measuring range.

[0027] The specific testing process for using this invention is as follows: Connect support unit bracket 1 41 and support unit bracket 2 42 to propulsion device 1 21 and propulsion device 2 22, install the drive motor, and adjust the bracket to a suitable position; install support unit 1 61, support unit 2 62, and motor rotor 9 respectively; install displacement measuring device 7, adjust the position of displacement sensor 76 in each direction, install speed measuring device 8, and adjust the distance from the probe of speed sensor 81 to the rotor surface; drive the motor to make the rotor run at different speeds, and calculate and correct the dynamic balancing accuracy level of the rotor based on the test value of displacement sensor 76.

[0028] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention. In practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-speed motor rotor dynamic balancing test platform, characterized in that: The system includes a base platform (1) and two propulsion devices (21 and 22) respectively located on the left and right sides of the base platform (1). The propulsion device (21) is flexibly connected to the support unit bracket (41), and the propulsion device (22) is flexibly connected to the drive unit bracket (3). A drive unit (5) is fixed on the drive unit bracket (3). There is a support unit bracket (42) between the support unit bracket (41) and the drive unit (5). The bottom of the support unit bracket (41), the support unit bracket (42) and the drive unit bracket (3) are respectively provided with drive sliders. The base platform (1) is provided with a slide rail (10) adapted to the drive slider. The support unit bracket (41) and the support unit bracket (42) are respectively connected with electromagnetic bearings. The support unit consists of a support unit 1 (61) and a support unit 2 (62) formed by the end cap. A displacement measuring device (7) and a speed measuring device (8) are provided between the support unit 1 (61) and the support unit 2 (62). The displacement measuring device (7) includes a linear guide rail (71) and a lower slider (73) and an upper slider (74) provided on the linear guide rail (71). A sensor mounting block (75) is mounted on the upper slider (74) via a displacement sensor bracket (72). A displacement sensor (76) is mounted on the sensor mounting block (75). The speed measuring device (8) consists of a speed sensor bracket (82) fixed on the support unit support 1 (41) or the support unit support 2 (42) and a speed sensor (81) mounted on the speed sensor bracket (82).

2. The high-speed motor rotor dynamic balancing test platform according to claim 1, characterized in that, The first propulsion device (21) is connected to the first support unit bracket (41) via a ball joint bearing (11), and the second propulsion device (22) is connected to the drive unit bracket (3) via a ball joint bearing (11).

3. The high-speed motor rotor dynamic balancing test platform according to claim 1, characterized in that, The support unit bracket one (41) and support unit bracket two (42) adopt non-contact electromagnetic bearings.

4. The high-speed motor rotor dynamic balancing test platform according to claim 1, characterized in that, The linear guide (71) is also equipped with a slider adjustment knob (77).

5. The high-speed motor rotor dynamic balancing test platform according to claim 1, characterized in that, The displacement sensor (76) is an eddy current sensor.

6. The high-speed motor rotor dynamic balancing test platform according to claim 1, characterized in that, The linear guide (71) and displacement sensor bracket (72) are respectively provided with scales (78) with a graduation value of 1mm and a total length of 1m.

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