Single-bearing motor under test state and test method

Abstract

The invention discloses a single-bearing motor in a test state and a test method. The motor comprises a motor stator, a motor rotor and a rotating shaft arranged in a motor housing. The non-driving end of the rotating shaft is supported on a second end cover through a bearing. The motor is characterized in that the motor comprises a cover plate provided with a circular hole, the cover plate is fixed on the second end cover, and covers the non-driving end to form a cavity. A coaxial test rotating shaft is arranged at the end of the non-driving end to pass through the circular hole. A speed measuring toothed disc is arranged on the non-driving end, and a Hall speed measuring sensor is arranged in the cavity. By designing the cover plate with a circular hole and the test rotating shaft extending from the non-driving end, the purpose of outputting torque from the test rotating shaft is achieved, and the removal of a small gear box is avoided. A speed measuring toothed disc is arranged on the non-driving end, and a Hall speed measuring sensor is arranged in the cover plate. The rotation speed test and the torque test are simultaneously realized through the non-driving end.

Description

Technical Field

[0001] The present invention relates to the technical field of single-bearing motor testing, and more specifically, to a single-bearing motor in a testing state and a testing method. Background Art

[0002] As domestic railway equipment gradually goes abroad, in order to adapt to foreign narrow-gauge railways, the design space for traction motors on locomotive bogies is small. The motor structure that uses a small gearbox and the transmission end cover of the motor is often used to save space. For this single-bearing motor structure, it is necessary to test the motor and small gearbox in the early stage of design, so as to expose possible problems in the drive system in advance. The transmission end cover of the single-bearing motor is the gearbox structure of the locomotive. The motor shaft is connected to the small gear of the locomotive gearbox. When conducting preliminary tests on the motor and traction system, it is necessary to measure the size of the transmission torque, and it is impossible to output torque. In addition, during the test, it is assembled on a test bench or a test motor. The center line of the test motor is aligned with the center line of the test motor, and the transmission is transmitted through the coupling. At the same time, the torque of the motor is measured by the torque meter. However, the transmission end of the single-bearing traction motor is the small gear of the locomotive, and the motor cannot adapt to the conventional test bench.

[0003] At present, the conventional solution is to design the end cover and support bearing and other associated seals and support structures of the bearing at the transmission end of the test motor, and use the normal output torque of the coupling. This method has the following problems: although the motor can output torque normally, the electrical performance of the motor can be verified by the above method test, but because the structure of the test motor is inconsistent with that of the normal motor, the mechanical vibration and noise of the motor cannot be reflected normally. In addition, the motor and the gearbox share the bearing, and the vibration of the gearbox part on the shaft system and the bearing temperature change cannot be verified. This results in the whole set of tests can only be directly carried out on the locomotive bogie Rolling test, that is, the test of the final locomotive vehicle or the test of the final locomotive vehicle. At this time, it is the final post-test after the assembly of the entire locomotive. The motor, transformer, converter, gearbox and other components and even the combined test of the traction system have been completed. If the rolling vibration test or the vehicle test finds that the motor and the small gearbox system components do not match after the motor and the gearbox are combined, resulting in abnormal vibration, excessive noise, abnormal bearing temperature rise or other abnormalities, it will have a great impact on the various components of the vehicle and even need to be redesigned. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a single-bearing motor and a test method in a test state, which ensures the structural consistency of the motor in the test state and the product state, and the matching between the motor and the transmission gearbox can be verified in the early stage of the test.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a single-bearing motor in a test state is provided, comprising a motor stator, a motor rotor and a rotating shaft arranged in a motor housing, wherein the non-drive end of the rotating shaft is supported on a second end cover through a bearing, and comprises a cover plate with a circular hole, the cover plate is fixed on the second end cover, and covers the non-drive end to form a cavity, a coaxial test rotating shaft fixed at the end of the non-drive end passes through the above-mentioned circular hole, a speed measuring gear disc is arranged on the non-drive end, and a Hall speed measuring sensor is arranged in the cavity.

[0006] Its working principle is: by designing a second end cover with a circular hole and a test shaft extending from the non-drive end, the purpose of outputting torque from the test shaft is achieved, avoiding the removal of the small gear box, and setting a speed measuring gear on the non-drive end, and setting a Hall speed sensor in the cover plate, so that the speed test and torque test are realized simultaneously through the non-drive end.

[0007] Furthermore, the portion of the test shaft extending outward through the circular hole is used to output torque, and the purpose of testing the output torque is achieved by extending the non-output end of the motor shaft through the test shaft.

[0008] Furthermore, the cover plate protrudes outward, and its inner wall covers the non-transmission end. The Hall speed sensor is fixed to the inner wall of the cover plate, forming an inner cavity structure that provides installation space for the Hall speed sensor and the speed gear.

[0009] According to another aspect of the present invention, a method for testing a single-bearing motor in a test state is provided, wherein a single-bearing motor in a test state is used for testing, and the method comprises the following steps:

[0010] S100, remove the cover plate and fix the test shaft coaxially with the shaft;

[0011] S200, a speed measuring gear disc is fixed on the non-driving end of the rotating shaft, and a Hall speed measuring sensor is fixed on the inner wall of the cover plate;

[0012] S300, passing the test shaft and the non-driving end through the circular holes on the cover plate in sequence, and then fixing the cover plate on the second end cover;

[0013] S400, fix the single-bearing motor on the test bench, connect the test shaft to the torque meter on the test bench, convert the motor to the test state, and conduct the test;

[0014] S500, after the test is completed, remove the cover, then cut off the test shaft part, reinstall the cover without round holes, and the motor is restored from the test state to the product state.

[0015] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0016] (1) The present invention provides a single-bearing motor testing method under a test state. The motor does not need to remove the small gear box under the test state. The motor is connected to the torque meter on the test bench in the form of an extended rotating shaft at the non-output end, thereby ensuring the structural consistency of the motor under the test state and the product state, avoiding the influence of structural inconsistency or manufacturing factors of the transmission end test tooling on the test result. The test result is closer to the actual working state of the motor when it is installed in the locomotive.

[0017] (2) The present invention provides a single-bearing motor testing method under a test state. Since the consistency between the test state and the product state can be maintained, the matching between the components of the motor, coupling and transmission gearbox system can be verified in the early stage of the test, thereby avoiding the matching problems to be exposed in the later stage of the whole vehicle test, and sometimes even the need to redesign the components due to mismatch. This greatly improves the detection of system matching in the system design process and shortens the design cycle.

[0018] (3) The present invention provides a single-bearing motor testing method under a test state. After the motor has completed the test, if it needs to be converted to a product state, it is only necessary to cut off the portion of the motor shaft extending from the non-drive end. Through this testing method, it is avoided to redesign a set of drive end support bearing structures, sealing components, end covers and other components, thereby greatly reducing the testing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A cross-sectional view of a single-bearing motor in a test state according to Embodiment 1 of the present invention;

[0020] Figure 2 This is a cross-sectional view of the single-bearing motor product state according to the first embodiment of the present invention.

[0021] In all the drawings, the same figure marks represent the same technical features, specifically: 1. small gear box; 2. motor stator; 3. motor rotor; 4. motor end cover; 5. rotating shaft; 6. speed measuring gear plate; 7. cover plate; 8. motor housing; 9. first end cover; 10. Hall speed sensor; 11. circular hole; 13. test rotating shaft; 15. coupling; 51. transmission end; 52. non-transmission end. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] like Figure 1As shown, according to the first aspect of the present invention, this embodiment provides a single-bearing motor in a test state, including a motor housing 8 and a first end cover 9 and a second end cover 4 arranged on the openings at both ends of the motor housing 8, and a motor stator 2, a motor rotor 3 and a rotating shaft 5 are arranged in the motor housing 8, wherein the two ends of the rotating shaft 5 are respectively a transmission end 51 and a non-transmission end 52, the transmission end 51 is supported on the first end cover 9 through a bearing, and the non-transmission end 52 is supported on the second end cover 4 through a bearing, and a small gear box 1 sharing the end cover is arranged on the outer side of the first end cover 9.

[0024] Furthermore, when the single-bearing motor (hereinafter referred to as "motor") is installed in the product state of the locomotive, the transmission end 51 is connected to the gear set shaft in the small gear box 1 for outputting power. Specifically, the transmission end 51 is connected to the small gear in the gear set through a coupling, and the small gear is then meshed with the large gear to drive the locomotive shaft to rotate; in the test state of the motor, it is necessary to verify the mechanical vibration, noise and other parameters of the motor, as well as the vibration, bearing temperature and other parameters of the small gear box 1. Therefore, it is necessary to ensure that the motor in the test state is consistent with the product state. The small gear box 1 cannot be removed, and the transmission end 51 is connected to the small gear in the gear set through a coupling, and the small gear is meshed with the large gear to drive the locomotive shaft to rotate. 1 cannot be used as the torque output end during the test. Therefore, a cover plate 7 and a Hall speed sensor 10 are arranged outside the second end cover 4 supporting the non-drive end 52, and a speed toothed disc 6 is fixed on the non-drive end 52 for speed detection. Furthermore, a circular hole 11 is arranged on the cover plate 7, and a coaxial test shaft 13 is arranged on the non-drive end 52 to pass through the circular hole 11. The test shaft 13 is connected to the torque meter on the test bench through a coupling 15 for output torque testing. During the test, the speed toothed disc 6 and the Hall speed sensor 10 can still monitor the speed normally. Preferably, the shaft 5 is directly cut and processed in place according to the extended length of the test shaft 13 during processing, or extended by welding or other methods.

[0025] Preferably, the portion of the test shaft 13 extending outward through the circular hole 11 is designed as a conical surface or a cylindrical surface, and is fixed to the conical surface or the cylindrical surface using a coupling 15. The matching length and diameter of the test shaft 13 and the coupling 15 are calculated for interference fit adaptability based on the output torque of the motor.

[0026] Furthermore, the motor in the test state is connected to the torque meter shaft on the test bench through the coupling 15 to output torque. The motor in the test state can avoid removing the small gear box 1 to output torque from the output end for testing, thereby ensuring the structural consistency of the motor in the test state and in the product state, making the test parameters more reliable and saving the tooling required for the test.

[0027] Furthermore, the cover plate 7 is fixedly attached to the outside of the second end cover 4, the cover plate 7 protrudes outward, and its inner wall forms a cavity covering the non-driving end 52, the Hall speed sensor 10 is fixed to the inner wall of the cover plate 7, the speed toothed disc 6 is fixed to the non-driving end and rotates with the non-driving end, and both the Hall speed sensor 10 and the speed toothed disc 6 are located in the cavity.

[0028] Further, according to a second aspect of the present invention, a test method for a single-bearing motor in a test state is provided, and the test is performed using the single-bearing motor, comprising the following steps:

[0029] S100, the cover plate 7 is removed, and the extended end test shaft 13 of the shaft 5 extends outward from the second end cover 4;

[0030] S200, fixing the speed measuring gear disc 6 on the non-driving end of the rotating shaft 5, and fixing the Hall speed measuring sensor 10 on the inner wall of the cover plate 7;

[0031] S300, passing the test shaft 13 and the non-driving end through the circular hole 11 on the cover plate 7 in sequence, and then fixing the cover plate 7 on the second end cover;

[0032] S400, fixing the coupling 15 on the test shaft 13, fixing the single-bearing motor on the test bench, connecting the coupling 15 to the torque meter shaft on the test bench, converting the motor to a test state, and conducting a test;

[0033] S500, after the test is completed, the coupling 15 and the cover plate 7 are removed, and then the test shaft 13 is cut off, and the cover plate 7 without the circular hole 11 is reinstalled, and the motor is restored from the test state to the product state.

[0034] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-bearing motor in a test state, comprising a motor stator (2), a motor rotor (3) and a rotating shaft (5) arranged in a motor housing (8), wherein a non-driving end (52) of the rotating shaft (5) is supported on a second end cover (4) through a bearing, characterized in that: The invention comprises a cover plate (7) provided with a circular hole (11), the cover plate (7) being fixed on the second end cover (4) and covering the non-driving end (52) to form a cavity, a coaxial test shaft (13) being arranged at the end of the non-driving end (52) and passing through the circular hole (11), a speed measuring toothed disc (6) being arranged on the non-driving end (52), and a Hall speed measuring sensor (10) being arranged in the cavity.

2. A single-bearing motor in a test state according to claim 1, characterized in that: The portion of the test shaft (13) extending outward through the circular hole (11) is used to output torque.

3. A single-bearing motor in a test state according to claim 1 or 2, characterized in that: The cover plate (7) protrudes outward, and its inner wall covers the outside of the non-transmission end (52). The Hall speed sensor (10) is fixed to the inner wall of the cover plate (7).

4. A single-bearing motor test method under test conditions, characterized in that: The method of conducting a test using a single-bearing motor in a test state as claimed in any one of claims 1 to 3 comprises the following steps: S100, removing the cover plate (7) and fixing the test shaft (13) coaxially with the shaft (5); S200, fixing a speed measuring toothed disc (6) on the non-transmission end of the rotating shaft (5), and fixing a Hall speed measuring sensor (10) on the inner wall of the cover plate (7); S300, passing the test shaft (13) and the non-driving end through the circular hole (11) on the cover plate (7) in sequence, and then fixing the cover plate (7) on the second end cover; S400, fixing the single-bearing motor on the test bench, connecting the test shaft (13) to the torque meter shaft on the test bench, converting the motor to a test state, and conducting a test; S500, after the test is completed, the cover plate (7) is removed, and then the test shaft (13) is cut off, and the cover plate (7) without the circular hole (11) is reinstalled, and the motor is restored from the test state to the product state.

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