CN211504631U

CN211504631U - Online stress testing device for motor rotor

Info

Publication number: CN211504631U
Application number: CN201922387538.3U
Authority: CN
Inventors: 李淑晶; 卢茂祥
Original assignee: Regal Beloit Suzhou Co Ltd
Current assignee: Regal Beloit Suzhou Co Ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-09-15
Anticipated expiration: 2029-12-26

Abstract

The utility model discloses an electric motor rotor is stress test device on line, the power distribution box comprises a box body, the rotor support, the bearing, brush ring power inducer, the tachymeter, first shaft coupling, the second shaft coupling, direct current motor, the electric power converter, resistance strain gauge and static resistance strain gauge, rotor support and bearing setting are in the box, the rotor setting that awaits measuring is on the rotor support, and be connected with the bearing, the bearing passes through the second shaft coupling and is connected with direct current motor, utilize the electric power converter to provide the electric energy for direct current motor, the other end of the rotor that awaits measuring is connected with brush ring power inducer through first shaft coupling, resistance strain gauge pastes on the rotor that awaits measuring, be connected with static resistance strain gauge through brush ring power inducer, utilize the tachymeter to measure the rotational speed of the rotor that awaits measuring. The resistance strain gauge and the brush ring power-on device are used for acquiring real-time data of the rotor to be tested, so that the online stress test of the rotor to be tested is realized.

Description

Online stress testing device for motor rotor

Technical Field

The utility model relates to the field of electric machines, in particular to online stress test device of electric motor rotor.

Background

The development of power electronic technology, new material technology and modern control theory, the high-speed motor is widely applied in various fields with the remarkable advantages of excellent running characteristic, better controllability, additivity, high reliability, compact structure and the like, and the research and the popularization and the application of high-speed permanent magnet synchronous motor equipment and related technologies revolutionize high-end driving and high-efficiency energy-saving technology in the industrial field, show wide development prospect and enable the high-speed permanent magnet synchronous motor to be widely applied in industrial production.

The high-speed permanent magnet motor can directly drive a prime motor, an intermediate transmission link is omitted, the size of the whole machine is reduced, the efficiency is improved, and the advantages enable the high-speed permanent magnet motor to be widely applied to the fields of aerospace, intelligent manufacturing, modern traffic and the like. The rotor is a main rotating part of the motor, the mechanical property of the rotor is directly related to the overall performance of the motor, particularly, the rotating speed of the high-speed permanent magnet motor is tens of thousands of revolutions per minute or even hundreds of thousands of revolutions per minute, the rotor is subjected to huge centrifugal force, and meanwhile, the tensile strength of a permanent magnet is weak, so that the statics and modal analysis of the high-speed permanent magnet motor rotor is particularly important.

SUMMERY OF THE UTILITY MODEL

Aiming at overcoming the defects of the prior art, the utility model discloses a motor rotor online stress testing device, which comprises a box body, a rotor bracket, a bearing support, a brush ring current-leading device, a velocimeter, a first coupler, a second coupler, a direct current motor, a power converter, a resistance strain gauge and a static resistance strain gauge, wherein the rotor bracket and the bearing support are arranged in the box body, a rotor to be tested is arranged on the rotor bracket and is connected with the bearing support, the bearing support is connected with the direct current motor through the second coupler, the power converter is utilized to provide electric energy for the direct current motor, the other end of the rotor to be tested is connected with the brush ring current-leading device through the first coupler, the resistance strain gauge is pasted on the rotor to be tested, and the brush ring current leading device is connected with the static resistance strain gauge, and the tachometer is utilized to measure the rotating speed of the rotor to be measured.

Further, the box is formed by combining resin plates, and the thickness of the box is larger than 65 mm.

Furthermore, the temperature compensation device also comprises a temperature compensation sheet and a compensation block, wherein the compensation block is made of the same material as the rotor to be measured, and the temperature compensation sheet is pasted on the compensation block.

Further, the velocimeter is a flash light velocimeter.

The utility model discloses the beneficial effect who gains:

the utility model realizes the online stress test of the rotor to be tested by acquiring real-time data of the rotor to be tested through the resistance strain gauge and the brush ring power-inducing device; the cooperation tachymeter can measure the rotor and stop until bursting whole in-process rotor stress variation, and the test range is wide. In addition, the temperature compensation piece is added, so that the influence on the test structure due to the temperature change of the rotor is avoided, the result error is further reduced, and the accuracy of the test result is improved.

Drawings

Fig. 1 is a schematic structural view of an online stress testing device for a motor rotor according to the present invention;

the reference numbers are as follows:

1. the device comprises a box body, 2, a rotor support, 3, a bearing support, 4, a brush ring electricity leading device, 5, a velocimeter, 6, a first coupler, 7, a second coupler, 8, a direct current motor, 9, an electric power converter, 10, a resistance strain gauge, 11, a static resistance strain gauge, 12, a rotor to be measured, 13 and a temperature compensation sheet.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

An online stress testing device for a motor rotor is shown in figure 1 and comprises a box body 1, a rotor support 2, a bearing support 3, a brush ring current-leading device 4, a velocimeter 5, a first coupler 6, a second coupler 7, a direct current motor 8, a power converter 9, a resistance strain gauge 10 and a static resistance strain gauge 11, wherein the rotor support 2 and the bearing support 3 are arranged in the box body 1, a rotor 12 to be tested is arranged on the rotor support 2, and is connected with a bearing support 3, the bearing support 3 is connected with a direct current motor 8 through a second coupler 7, an electric power converter 9 is used for providing electric energy for the direct current motor 8, the other end of a rotor 12 to be tested is connected with a brush ring electricity leading device 4 through a first coupler 6, a resistance strain gauge 10 is pasted on the rotor 12 to be tested, the brush ring electricity leading device 4 is connected with the static resistance strain gauge 11, and the tachometer 5 is used for measuring the rotating speed of the rotor 12 to be measured. When the device is used, the direct current motor 8 is driven by the power converter 9 to enable the second coupling 7 to drive the rotor 12 to be tested to rotate, the resistance strain gauge 10 is electrically connected with the static resistance strain gauge 11 through the brush ring electricity leading device 4, and the value of the resistance strain gauge 10 is acquired through the static resistance strain gauge 11; and the rotating speed of the rotor 12 to be measured is monitored by the tachometer 5. In this embodiment, a bearing support is provided to improve the stability of the connection of the rotor 12 to be measured and the dc motor 8. In addition, in this embodiment, the velocimeter 5 and the static resistance strain gauge 11 can be directly connected to a computer, and an upper computer is installed on the computer to perform real-time data communication, and a coordinate graph of the rotating speed and the stress is automatically produced through the computer.

In one embodiment, the box body 1 is made of a resin plate; and a thickness greater than 65 mm. This ensures personnel safety when the rotor 12 to be tested bursts.

In one embodiment, the device further comprises a temperature compensation sheet 13 and a compensation block, the compensation block is made of the same material as the rotor to be measured, and the temperature compensation sheet 13 is adhered to the compensation block. The component with the resistance strain gauge 10 is always in a certain temperature field, and when the temperature changes, two situations occur: the first strain gauge sensitive gate resistance changes; second, the resistance changes due to the different coefficients of linear expansion of the sensitive grid and the member. Both variations cause the bridge output voltage to be a false unmeasured strain and therefore temperature compensated by the addition of the temperature compensation plate 13. To improve the accuracy of the test.

In one embodiment, the velocimeter 5 is a flash velocimeter. The rotating speed of the second coupling 7 is measured through the flash lamp velocimeter, and if the velocimeter 5 is placed in the box body 1, certain damage risks exist.

The above are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and equivalent arrangements as is within the spirit and scope of the present invention.

Claims

1. An online stress testing device for a motor rotor is characterized by comprising a box body, a rotor bracket, a bearing support, a brush ring electrical apparatus, a velometer, a first coupler, a second coupler, a direct current motor, a power converter, a resistance strain gauge and a static resistance strain gauge, the rotor bracket and the bearing support are arranged in the box body, the rotor to be tested is arranged on the rotor bracket, and is connected with the bearing support, the bearing support is connected with the direct current motor through a second coupler, the electric power converter is utilized to provide electric energy for the direct current motor, the other end of the rotor to be tested is connected with the brush ring power-on device through the first coupler, the resistance strain gauge is adhered to the rotor to be tested, and the brush ring current leading device is connected with the static resistance strain gauge, and the tachometer is utilized to measure the rotating speed of the rotor to be measured.

2. The on-line stress testing device for the motor rotor as recited in claim 1, wherein the box body is formed by combining resin plates, and the thickness of the box body is larger than 65 mm.

3. The on-line stress testing device for the motor rotor as recited in claim 1, further comprising a temperature compensation sheet and a compensation block, wherein the compensation block is made of the same material as the rotor to be tested, and the temperature compensation sheet is adhered to the compensation block.

4. The on-line stress testing device for the motor rotor as recited in claim 1, wherein the velocimeter is a flash lamp velocimeter.