CN105091799B - Coaxiality measuring system of motor end cover - Google Patents

Abstract

The application discloses axiality measurement system of motor end cover, including strutting arrangement, drive arrangement, detection device and measurement and control device, when the motor end cover that drive arrangement drive was fixed on strutting arrangement is rotatory, utilize detection device to carry out continuous measurement to the distance of the center of interior circle to the bearing room of motor end cover, obtain a plurality of radius data record, measurement and control device calculates the longest radius and the shortest radius in these a plurality of radius data record according to the cosine theorem, obtain the eccentricity of this motor end cover. If the eccentricity of the motor end cover exceeds the control index, the motor end cover is returned to a factory or scrapped to avoid being assembled on the motor, so that the quality of the whole motor is ensured.

Description

A Coaxiality Measuring System of Motor End Cover

technical field

The present application relates to the technical field of motor manufacturing, and more specifically, relates to a coaxiality measurement system of a motor end cover.

Background technique

The motor end cover is arranged at both ends of the motor body to carry the rotor shaft. A bearing chamber for the rotor bearing is arranged in the center of the end cover. In order to ensure the smooth operation of the motor, the center of the bearing chamber should be in line with the inner circle of the end cover. The center coincides, that is, the eccentricity is zero. However, in actual production, due to the process, machining accuracy and other reasons, the eccentricity of the motor end cover cannot be zero, that is, there is a certain distance between the center of the bearing chamber and the center of the inner circle of the end cover. In order to ensure the normal operation of the motor, the eccentricity of the motor end cover must be less than a certain index. Therefore, for motor manufacturers, the coaxiality measurement of the self-produced or incoming motor end cover must be carried out to avoid excessive eccentricity. The motor end cover is assembled to the motor to ensure the quality of the motor.

Contents of the invention

In view of this, the present application provides a coaxiality measurement system of a motor end cover, which is used to measure the eccentricity of the motor end cover, so as to avoid the assembly of the motor end cover with an excessive eccentricity on the motor.

In order to achieve the above purpose, the proposed scheme is as follows:

A coaxiality measurement system for a motor end cover, including a support device, a drive device, a detection device and a measurement and control device, wherein:

The supporting device is used to support the motor end cover through the bearing chamber of the motor end cover;

The driving device is used to drive the motor end cover to rotate around the center of the bearing chamber;

The detection device is used to continuously detect the radius data from the inner circle of the motor end cover to the center of the bearing chamber when the motor end cover rotates, and obtain a radius data record including all radius data;

The measurement and control device is used to control the output power of the driving device, and is also used to find the longest radius and the shortest radius from the radius data record, calculate the difference between the longest radius and the shortest radius, and convert the The difference between the longest radius and the shortest radius is divided by 2 to obtain the eccentricity of the motor end cover.

Optionally, the driving device includes a servo motor, a synchronous motor or an air motor.

Optionally, the detection device includes a laser displacement sensor.

Optionally, the measurement and control device includes a programmable logic controller.

Optionally, a display device is also included, wherein:

The display device is used to display the eccentricity.

Optionally, the display device includes a computer monitor or a liquid crystal display.

Optionally, a recording device is also included, wherein:

The recording device is used to record the eccentricity.

It can be seen from the above technical solutions that the present application discloses a coaxiality measurement system for the motor end cover, including a support device, a drive device, a detection device and a measurement and control device. The drive device drives the motor end fixed on the support device When the cover rotates, the detection device is used to continuously measure the distance from the inner circle of the motor end cover to the center of the bearing chamber to obtain multiple radius data records, and the measurement and control device finds the longest radius and the shortest radius from the radius data records, and calculates The difference between the longest radius and the shortest radius is divided by 2 to obtain the eccentricity of the motor end cover. If the eccentricity of the motor end cover is too large, it will be returned to the factory or scrapped to avoid assembling it on the motor, thereby ensuring the quality of the motor as a whole.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the schematic diagram of the front projection of the motor end cover provided by the present application;

FIG. 2 is a schematic diagram of a coaxiality measurement system for a motor end cover provided in an embodiment of the present application;

Fig. 3 is a schematic diagram of a coaxiality measuring system of a motor end cover provided by another embodiment of the present application;

Fig. 4 is a schematic diagram of a coaxiality measuring system of a motor end cover provided in another embodiment of the present application;

Fig. 5 is a structural diagram of a coaxiality measuring system for a motor end cover provided in another embodiment of the present application.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

FIG. 1 is a schematic front projection view of the motor end cover provided by the present application.

As shown in FIG. 1 , the figure includes the inner circle 100 of the motor end cover, the center of the inner circle 101 , the bearing chamber 200 and the center of the bearing chamber 201 .

Assuming that the radius of the inner circle of the motor end cover is R, the inner circle 100 and the bearing chamber 200 are projected on the same plane, the eccentricity is recorded as δ, and the distances between the center of the bearing chamber 201 and any two points on the inner circle 100 are r1 and r2 respectively. The angles are θ1 and θ2 respectively, where θ1 and θ2 can take values between 0° and 360°.

According to the law of cosines, it can be concluded that:

Note: X(θ1) changes with θ1, which is related to the roundness index of the inner circle 100 of the motor end cover.

Note: Similarly, X(θ2) changes with θ2, which is related to the roundness index of the inner circle 100 of the motor end cover.

When the motor end cover rotates with the center of the bearing chamber 201 as the axis, the runout from the center of the bearing chamber 201 to any two points on the inner circle is:

Δr＝r1-r2+X(θ1)-X(θ2)+ξ (3)

Note: ξ is a constant, which is the sum of the accumulated errors of the inherent clearance of the bearing chamber and the test tool itself.

Assuming that the inner circle of the motor end cover is relatively ideal, and record the roundness index as ΔX, then there are:

ΔX＝X(θ1)-X(θ2)

It can be seen from formula (1) or (2) that when the diagonal angle θ=180°, the value of r is the largest, as follows:

r _max =R+δ+ξ+ΔX (4)

When the diagonal angle θ=0°, the value of r is the smallest, and there are:

r _min ＝R-δ+ξ+ΔX (5)

Subtracting formula (5) from formula (4), it can be obtained: Δr=r _max -r _min =2δ, so as to obtain the following formula:

It can be known from formula (6) that with the bearing chamber circle 201 as the reference point and the motor end cover rotating 360°, it is only necessary to measure the maximum radius r _max and the minimum radius r _min with the center of the bearing chamber 201 as the circle point to calculate Out of eccentricity δ. The following embodiments are proposed based on the above principles.

Embodiment one

Fig. 2 is a coaxiality measurement system of a motor end cover provided by an embodiment of the present application.

As shown in FIG. 2 , the coaxiality measurement system of the motor end cover provided in this embodiment includes a support device 10 , a drive device 20 , a detection device 30 and a measurement and control device 40 .

The bottom of the supporting device 10 is fixed on a workbench 400 for supporting and fixing the motor end cover 300 to be tested and enabling the motor end cover 300 to rotate around the center of the bearing chamber 301 .

The driving device 20 is used to drive the motor end cover 300 fixed on the support device 10 to rotate around the center of the bearing chamber 301. Theoretically, the detection can be completed only by rotating the motor end cover 300 once. However, for the integrity of data collection, the motor end cover 300 may be rotated multiple times during actual measurement.

The detection device 30 is used to measure the distance from the inner circle of the motor end cover 300 to the axis of rotation when the motor end cover 300 rotates under the drive of the drive device 20 , that is, the distance from the inner circle of the motor end cover 300 to the bearing chamber 301 The distance of the center is continuously measured, and all the obtained radius data are output to form a radius data record.

The measurement and control device 40 is used to control the driving device 20 so that the driving device 20 drives the motor end cover 300 to rotate; meanwhile, it also receives the radius data record composed of all the radius data output by the detection device 30, and then from the radius data record Find the longest radius and the shortest radius, and finally calculate the longest radius and the shortest radius by using the aforementioned calculation method to obtain the eccentricity of the motor end cover 300 .

It can be seen from the above technical solutions that this embodiment provides a coaxiality measurement system for motor end caps, including a support device, a drive device, a detection device, and a measurement and control device. The drive device drives the motor end cap fixed on the support device When the cover rotates, the detection device is used to continuously measure the distance from the inner circle of the motor end cover to the center of the bearing chamber, and multiple radius data records are obtained. The measurement and control device uses the cosine law to measure the longest radius and Calculate the shortest radius to get the eccentricity of the motor end cover. If the eccentricity of the motor end cover is too large, it will be returned to the factory or scrapped to avoid assembling it on the motor, thereby ensuring the quality of the motor as a whole.

The driving device 20 in this application can be a servo motor, a synchronous motor or an air motor. Considering the number of auxiliary equipment and the rotation control accuracy, it is preferable to drive the motor end cover 300 by a synchronous motor.

The detection device 30 is preferably a laser displacement sensor, specifically a Keyence laser displacement sensor.

The measurement and control device 40 includes a programmable logic controller, which uses the corresponding output port to control the drive device 20 to drive the motor end cover 300 to rotate, and simultaneously receives and records all the radius data output by the detection device 30, and then according to the radius It is data to calculate the eccentricity of the motor end cover 300 .

Embodiment two

Fig. 3 is a schematic diagram of a coaxiality measurement system for a motor end cover provided by another embodiment of the present application.

As shown in FIG. 3 , the coaxiality measurement system provided in this embodiment is based on the previous embodiment with an additional display device 50 .

The display device 50 is connected with the measurement and control device 40, and is used to receive and display the eccentricity calculated by the measurement and control device 40, so that the inspector can intuitively obtain the eccentricity, and make corresponding treatment according to the eccentricity, thereby improving detection. efficiency. The display device 50 can be a computer monitor or a liquid crystal display.

Embodiment three

Fig. 4 is a schematic diagram of a coaxiality measurement system for a motor end cover provided by another embodiment of the present application.

As shown in Figure 4, the coaxiality measurement system provided by this embodiment is based on the previous embodiment, and a recording device 60 connected to the measurement control device 40 is added, and the recording device 60 is used to record all measured The eccentricity is recorded for filing.

Embodiment Four

Fig. 5 is a structural diagram of a coaxiality measuring system for a motor end cover provided in another embodiment of the present application.

As shown in FIG. 5 , the coaxiality measuring system provided in this embodiment includes a supporting device 10 fixed on a worktable 400 , a driving device 20 and a laser displacement sensor 31 .

The support device 10 is used to fix the motor end cover 300, and consists of a shaft positioning seat, a straight shank ER handle, a collet, a fastening ring and an end cover positioning shaft.

The driving device 20 is used to drive the motor end cover 300 to rotate, and is composed of a stepping motor, a stepping motor bracket, a rotating shaft joint, a pressure head, a pin, an electric cylinder and a compression spring.

The laser displacement sensor 31 is used to measure the distance from the inner circle of the motor end cover to the center of the bearing chamber, and output the radius data for calculating the eccentricity. The laser displacement sensor 31 is fixed on the workbench 400 through a bracket system, which includes a left and right delivery chute, a T-shaped connecting block, a sensor bracket, a free guide arm base, a long-stroke rack and pinion, and a butterfly Composed of free guide arms, the height, front, back and inclination of the laser displacement sensor 31 can be adjusted in multiple dimensions through the above bracket system.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the present application will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. a kind of the coaxial degree measurement of electric motor end cap, it is characterised in that including support meanss, drive device, detection means And measure and control device, wherein：

The support meanss are used to be supported the electric motor end cap by the bearing chamber of the electric motor end cap；

The drive device is used to drive the electric motor end cap with the center of the bearing chamber as axis is rotated；

The detection means is used to, when the electric motor end cap rotates, continuously detect the inner circle of the electric motor end cap to the bearing The radius data at the center of room, obtains the radius data record comprising all radius datas；

The measure and control device is used to control the drive device output power, is additionally operable to be searched most in being recorded from the radius data Major radius and most short radius, calculate the difference of the greatest radius and the most short radius, by the greatest radius and it is described most The difference of short radius obtains the offset at the inner circle center of the electric motor end cap and the center of bearing chamber divided by 2.

2. the coaxial degree measurement as claimed in claim 1, it is characterised in that the drive device includes servomotor, same Step motor or air motor.

3. the coaxial degree measurement as claimed in claim 1, it is characterised in that the detection means includes laser displacement sensing Device.

4. the coaxial degree measurement as claimed in claim 1, it is characterised in that the measure and control device includes FPGA control Device processed.

5. the coaxial degree measurement as described in any one of Claims 1 to 4, it is characterised in that also including display device, its In：

The display device is used to show the offset.

6. the coaxial degree measurement as claimed in claim 5, it is characterised in that the display device include computer monitor or LCDs.

7. the coaxial degree measurement as claimed in claim 5, it is characterised in that also including tape deck, wherein：

The tape deck is used to record the offset.