A high-speed motor rotor temperature measuring device

Abstract

The application provides a high-speed motor rotor temperature measuring device, which comprises a wireless transmitter for measuring the temperature of the rotor when the rotor rotates at high speed, wherein the wireless transmitter is connected with the rotor through a connecting mechanism; the connecting mechanism comprises a pair of top bearings, the two bearings of the pair of top bearings comprise a first bearing and a second bearing, the first bearing is connected with a rotor shaft, the second bearing is connected with a rotating shaft of the wireless transmitter, and the first bearing and the second bearing are installed in opposite directions; the connecting mechanism further comprises elastic members, the elastic members are arranged on the side, away from the rotor shaft, of the first bearing and on the side, away from the wireless transmitter, of the second bearing; and the wireless transmitter is kept balanced and has a cooling function when the rotor rotates at high speed.

Description

Technical Field

[0001] This invention relates to the field of high-speed rotor temperature measurement technology, and in particular to a high-speed motor rotor temperature measurement device. Background Technology

[0002] Rotor / magnet temperature measurement is an important research and development task in motor development. In order to transmit the temperature measurement data of the rotating body, an external wireless temperature measuring device (with many built-in circuit boards) is usually required and installed on the motor rotor. That is, the wireless temperature measuring device is directly connected to the motor rotor with bolts, flanges, etc., without special design, and rotates with the motor.

[0003] With the increasing demand for power density in motors, motors are continuously developing towards higher speeds and higher rotor temperatures. This has led to a bottleneck in the application of wireless temperature measurement devices, namely, the two major challenges of withstanding high speeds and high temperatures. Specifically, when the rotor is running at high speed, the wireless temperature measurement device also runs at high speed, resulting in significant vibration. In this case, a very strict alignment design is required. Furthermore, during testing, the high speed can easily cause overheating, often requiring long-term shutdowns to control the temperature of the remote sensing temperature measurement equipment. Summary of the Invention

[0004] In order to overcome the above-mentioned technical defects, the purpose of this invention is to provide a high-speed motor rotor temperature measuring device that can keep the wireless transmitter (temperature measuring device) balanced during high-speed operation and has a cooling function.

[0005] This invention discloses a high-speed motor rotor temperature measuring device, including a wireless transmitter for measuring the temperature of the rotor when it rotates at high speed. The wireless transmitter is connected to the rotor via a connecting mechanism. The connecting mechanism includes opposing bearings, each bearing consisting of a first bearing and a second bearing. The first bearing is connected to the rotor shaft, and the second bearing is connected to the shaft of the wireless transmitter. The first and second bearings are installed back-to-back. The connecting mechanism also includes an elastic element located on the side of the first bearing away from the rotor shaft and on the side of the second bearing away from the wireless transmitter. This ensures that when the rotor rotates at high speed, the axial forces between the rotor shaft and the shaft of the wireless transmitter cancel each other out.

[0006] Preferably, the connecting mechanism includes a housing, and the opposing bearing and the elastic element are disposed inside the housing; the housing is provided with cooling water channels for the flow of cooling water.

[0007] Preferably, the housing includes an inner housing and an outer housing, the opposing bearing and the elastic element are disposed in the cavity formed by the inner housing; the cooling water channel is disposed in the cavity formed between the inner housing and the outer housing, and is disposed on the inner housing or the outer housing.

[0008] Preferably, the cooling water channels are arranged circumferentially; the number of cooling water channels is greater than one, and several cooling water channels are arranged axially.

[0009] Preferably, the elastic element is a wave spring.

[0010] Preferably, the opposing bearing is an angular contact bearing.

[0011] Preferably, the rotor shaft is connected to the connecting mechanism via a gear coupling.

[0012] Compared with existing technologies, the above technical solution has the following advantages:

[0013] 1. The radial misalignment between the motor rotor and the wireless transmitter is eliminated by utilizing the clearance of the two back-mounted top bearings. Furthermore, by utilizing the characteristics of angular contact bearings, the axial force can be withstood. Combined with the elastic element, the connection mechanism achieves self-balancing under different rotor axial forces, thereby effectively improving the problem of wireless transmitter jitter under high-speed operation.

[0014] 2. The cooling water channel is integrated inside the housing of the connecting mechanism, which realizes the cooling of the bearing and the cooling isolation between the rotor and the wireless transmitter, preventing the heat of the rotor running at high speed from being conducted to the wireless transmitter, thereby keeping the temperature at the wireless transmitter low and avoiding multiple shutdowns for cooling. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the high-speed motor rotor temperature measuring device provided by the present invention;

[0016] Figure 2 This is a schematic diagram of the connection mechanism provided by the present invention.

[0017] Among them: 1-rotor, 2-wireless transmitter, 3-bearing, 301-bearing No. 1, 302-bearing No. 2, 4-elastic element, 5-housing, 6-cooling water channel, 7-drum gear coupling. Detailed Implementation

[0018] The advantages of the present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments.

[0019] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0020] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0021] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0022] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0024] In the following description, suffixes such as "module," "part," or "unit" used to denote elements are used only for the convenience of the description of the invention and have no specific meaning in themselves. Therefore, "module" and "part" can be used interchangeably.

[0025] See appendix Figure 1This invention discloses a temperature measuring device for a high-speed motor rotor 1, including a wireless transmitter 2 for measuring the temperature of the rotor 1 when it rotates at high speed. The wireless transmitter 2 is typically a remote-sensing infrared thermometer, but is not limited to this. This invention connects the wireless transmitter 2 to the rotor 1 via a connecting mechanism. When the rotor 1 rotates at high speed, the wireless transmitter 2 rotates along with it to measure the temperature of the rotor 1 (magnet) when it rotates at high speed. By setting this connecting mechanism, the wireless transmitter 2 of this measurement system remains balanced and has a cooling function during high-speed operation.

[0026] Specifically, the connection mechanism of the present invention includes opposing bearings 3, which should be understood as two bearings 3 installed in opposite directions. In a preferred embodiment of the present invention, the two bearings 3 of the opposing bearings 3 include a first bearing 301 and a second bearing 302. The first bearing 301 is connected to the shaft of the rotor 1, and the second bearing 302 is connected to the shaft of the wireless transmitter 2, thereby connecting the motor rotor 1 and the wireless transmitter 2, and when the rotor 1 rotates at high speed, the wireless transmitter 2 also rotates.

[0027] The top bearing 3 is preferably an angular contact bearing. An angular contact ball bearing can withstand both radial and axial loads simultaneously and can operate at higher speeds.

[0028] Furthermore, the opposing bearings 3 used in this invention are two counter-mounted (angular contact) bearings 3, giving the combination load-bearing capacity in different directions. This can be understood as using a double-direction thrust angular contact ball bearing, which can simultaneously withstand combined radial and axial loads, restricting axial displacement of the shaft in both directions. The radial clearance of the two bearings 3 can cover the alignment issues of radial assembly.

[0029] Of course, in other embodiments, in addition to angular contact bearings, needle roller bearings or tapered roller bearings can also be used, as long as they can simultaneously bear axial and radial loads.

[0030] As a complement, the connecting mechanism also includes two elastic elements 4. The two elastic elements 4 are located between the two bearings 3, that is, one elastic element 4 is located on the side of bearing 301 away from the rotor 1 shaft, and the other elastic element 4 is located on the side of bearing 302 away from the wireless transmitter 2.

[0031] This configuration ensures that when rotor 1 rotates at high speed, the axial forces between the shaft of rotor 1 and the shaft of wireless transmitter 2 cancel each other out. See Appendix for details. Figure 2 When subjected to axial impact force, the connecting mechanism satisfies the axial force F1 = F2, and (in, (The elastic coefficients of the two elastic elements 4) mean that the connecting mechanism will dynamically adjust the balance according to the real-time force of the axial impact.

[0032] This invention utilizes the clearance of the two back-mounted opposing bearings 3 to eliminate the radial misalignment problem between the motor rotor 1 and the wireless transmitter 2. Furthermore, by utilizing the characteristics of the angular contact bearings 3, it can withstand axial axial forces. Combined with the elastic element 4, the connection mechanism achieves self-balancing under different axial forces of the rotor 1, thereby effectively improving the problem of vibration of the wireless transmitter 2 under high-speed operation.

[0033] Furthermore, the connecting mechanism includes a housing 5, with the top bearing 3 and elastic element 4 disposed inside the housing 5. The housing 5 is provided with a cooling water channel 6 for circulating cooling water. The cooling water channel 6 achieves cooling of the bearing 3 and also achieves cooling isolation between the rotor 1 and the wireless transmitter 2, preventing the heat from the high-speed rotation of the rotor 1 from being conducted to the wireless transmitter 2, thereby keeping the temperature at the wireless transmitter 2 low and avoiding multiple shutdowns for cooling.

[0034] This invention solves the problem of balanced operation of the remote sensing transmission mechanism under the ultra-high speed motor by setting the connection mechanism between the motor rotor 1 and the wireless transmitter 2, and avoids the interruption of the experiment due to the vibration of the test bench. In addition, the cooling water channel 6 avoids the damage of the temperature measuring equipment due to overheating, and solves the problem of temperature measurement test interval caused by the high temperature of the rotor 1. It can shorten the test time of the high temperature section by 1 / 3 and avoid the risk of high-value equipment damage.

[0035] Preferably, the housing 5 includes an inner housing and an outer housing, with the top bearing 3 and the elastic member 4 disposed within the cavity formed by the inner housing. A cooling water channel 6 is disposed within the cavity formed between the inner housing and the outer housing, and is located on either the inner housing or the outer housing. In a preferred embodiment provided by the present invention, the cooling water channel 6 is disposed on the inner wall of the outer housing.

[0036] Furthermore, the cooling water channels 6 are arranged circumferentially, and the number of cooling water channels 6 is greater than one. Several cooling water channels 6 are arranged along the axial direction to increase the cooling area and enhance the cooling effect. In this embodiment, several cooling water channels 6 need to lead to a main cooling water channel, through which the cooling water source is connected.

[0037] In other preferred embodiments, only one cooling channel 6 may be provided, which is arranged in a spiral pattern within the cavity formed between the inner shell and the outer shell. That is, both circumferential and axial arrangements within the shell 5 are also achieved.

[0038] In a preferred embodiment of the present invention, the elastic element 4 is a wave spring, and two wave springs are disposed between the two bearings 3, that is, one wave spring is disposed on the side of bearing 301 away from the rotor 1 shaft, and the other wave spring is disposed on the side of bearing 302 away from the wireless transmitter 2.

[0039] The rotor shaft 1 is connected to the connecting mechanism via a drum-shaped gear coupling 7. The main function of the drum-shaped gear coupling 7 is to connect the driving shaft and the driven shaft, transmitting torque to make both shafts rotate together. The structure of the drum-shaped gear coupling 7 is basically symmetrical. Viewed from the tooth tip direction, the teeth on the outer gear sleeve are drum-shaped, with the tooth thickness gradually decreasing from the center to both sides. The teeth on the inner gear ring that meshes with it are straight teeth. The tooth tips and tooth surfaces of the outer gear sleeve are arc-shaped, therefore the entire coupling is a double-joint coupling. This allows for a larger angular misalignment between the two shafts, compensating for angular errors caused by misalignment of the two connecting shafts, as well as axial and radial installation errors, and permitting a certain degree of displacement between the two shafts.

[0040] The shell 5 is made of metal, preferably steel, to ensure its strength.

[0041] In the preferred embodiments provided by the present invention (see appendix) Figure 1-2 Since the diameter of the shaft of the wireless transmitter 2 is larger than the diameter of the motor rotor 1, the axial cross section of the housing 5 of the connecting mechanism is trapezoidal (i.e., the entire connecting mechanism is conical). In other embodiments, the housing 5 of the connecting mechanism may also be cylindrical. It can be understood that the shape of the housing 5 of the connecting mechanism is designed according to the dimensions of the motor rotor 1 and the wireless transmitter 2.

[0042] It should be noted that the embodiments of the present invention have better implementability and are not intended to limit the present invention in any way. Any person skilled in the art may use the above-disclosed technical content to change or modify it into equivalent effective embodiments. However, any modifications or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A high-speed motor rotor temperature measuring device, characterized in that, It includes a wireless transmitter for measuring the temperature of the rotor when it rotates at high speed, and the wireless transmitter is connected to the rotor via a connecting mechanism; The connecting mechanism includes a top bearing, and the two bearings of the top bearing include a first bearing and a second bearing arranged at intervals. The first bearing is connected to the rotor shaft, and the second bearing is connected to the rotating shaft of the wireless transmitter. The first bearing and the second bearing are installed back to back. The connecting mechanism also includes two elastic elements, which are located between the two bearings. One elastic element is located on the side of the first bearing away from the rotor shaft, and the other elastic element is located on the side of the second bearing away from the wireless transmitter. This ensures that when the rotor rotates at high speed, the axial forces between the rotor shaft and the shaft of the wireless transmitter cancel each other out.

2. The high-speed motor rotor temperature measuring device according to claim 1, characterized in that, The connecting mechanism includes a housing, and the opposing bearing and the elastic element are disposed inside the housing; The casing is provided with cooling water channels for the flow of cooling water.

3. The high-speed motor rotor temperature measuring device according to claim 2, characterized in that, The housing includes an inner housing and an outer housing, and the opposing bearing and the elastic element are disposed in the cavity formed by the inner housing; The cooling water channel is located in the cavity formed between the inner shell and the outer shell, and is located on the inner shell or the outer shell.

4. The high-speed motor rotor temperature measuring device according to claim 3, characterized in that, The cooling water channels are arranged circumferentially; the number of cooling water channels is greater than one, and several cooling water channels are arranged axially.

5. The high-speed motor rotor temperature measuring device according to claim 1, characterized in that, The elastic element is a wave spring.

6. The high-speed motor rotor temperature measuring device according to claim 1, characterized in that, The opposing bearings are angular contact bearings.

7. The high-speed motor rotor temperature measuring device according to claim 1, characterized in that, The rotor shaft is connected to the connecting mechanism via a gear coupling.

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