Method for measuring symmetry degree of even number of short keyways of motor casing and related device

Abstract

The invention provides a method for measuring the symmetry degree of an even number of short key grooves of a motor shell and a related device, and belongs to the technical field of motor form and location tolerance measurement. The method comprises the following steps: constructing a first long straight line by using first coordinate information and second coordinate information; acquiring third coordinate information on the other side of the even-number short key slot of the motor shell and fourth coordinate information on the same side of the even-number short key slot of the motor shell in the set degree direction of the motor shell; constructing a second long straight line by using the third coordinate information and the fourth coordinate information; determining a first distance and a second distance according to the coordinate origin, the first long straight line and the second long straight line; and subtracting the obtained first distance from the second distance to obtain the symmetry degree of the even number of short key slots of the motor shell. According to the method, the problems that only points rather than straight lines can be obtained and the symmetry degree cannot be solved due to the fact that the selectable part of the short keyway boundary is too short are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of motor form and position tolerance measurement, and in particular relates to a method for measuring the symmetry of an even-numbered short keyway of a motor casing and a related device. Background Art

[0002] During the machining and manufacturing process, the symmetry of parts is a very important quality indicator. There are symmetry error requirements for the reference circle on both sides of the short keyway of the motor housing. The error is caused by the deviation and non-parallelism of the short keyway actually processed to the axis. Therefore, the measurement of symmetry is very critical. If the symmetry of the short keyway processing cannot be controlled within a reasonable range, it will affect the bonding position of the magnetic steel, thereby changing the size of the air gap and generating torque fluctuations. The motor may also have a phenomenon of sweeping the bore, affecting the torque performance of the motor. Therefore, accurate symmetry can avoid vibration and noise during the operation of the motor, ensure positioning and matching accuracy, and is the key to the smooth operation of the motor.

[0003] The symmetry of the short keyway of the motor housing is generally required to be The simple and easy-to-operate measurement method can be measured with a vernier caliper, but since the depth of the short keyway of the motor housing is only , and there are chamfers at the root and end, so the part that can be effectively used is too small to be measured. The minimum size of the stylus for the three-dimensional contact measuring machine is , and measurement is impossible. At this time, if the non-contact optical projection method is used, although the short keyway boundary can be directly identified and selected for measurement, there will be a problem that the part of the short keyway boundary that can be selected is too short and only a point can be obtained instead of a straight line, and the symmetry cannot be obtained. Summary of the invention

[0004] The purpose of the present invention is to provide a method and related device for measuring the symmetry of an even-numbered short keyway of a motor casing, so as to solve the problem in the prior art that the part that can be selected from the short keyway boundary is too short and only a point can be obtained instead of a straight line, and the symmetry cannot be obtained.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for measuring the symmetry of an even-numbered short keyway of a motor housing, comprising the following steps: Obtaining circular coordinate information of the motor housing, and using the obtained circular coordinate information of the motor housing to construct a reference circle and determine the coordinate origin; Obtain first coordinate information on one side of the even-numbered short key slot of the motor housing and second coordinate information on the same side of the even-numbered short key slot of the motor housing in the set degree direction of the motor housing; Constructing a first long straight line using the first coordinate information and the second coordinate information; Obtain the third coordinate information of the other side of the even-numbered short key slot of the motor housing and the fourth coordinate information of the same side of the even-numbered short key slot of the motor housing in the set degree direction of the motor housing; constructing a second long straight line using the third coordinate information and the fourth coordinate information; Determine a first distance and a second distance respectively according to the coordinate origin and the first long straight line and the second long straight line; The difference between the first distance and the second distance is obtained to obtain the symmetry of the even-numbered short keyways of the motor housing.

[0006] A further improvement of the present invention is that in the step of obtaining the circular coordinate information of the motor housing and using the obtained circular coordinate information of the motor housing to construct a reference circle and determine the coordinate origin, the reference circle is constructed according to the least squares method using the obtained circular coordinate information of the motor housing.

[0007] A further improvement of the present invention is that the range of the setting degree is .

[0008] A further improvement of the present invention is that in the step of constructing the first long straight line using the first coordinate information and the second coordinate information, the calculation formula of the first long straight line is:

[0009] in,( )and( ) are the first coordinate information and the second coordinate information respectively, is the relationship of the first longest straight line, is the independent variable.

[0010] A further improvement of the present invention is that in the step of constructing the second long straight line using the third coordinate information and the fourth coordinate information, the calculation formula of the second long straight line is:

[0011] in,( )and( ) are the third coordinate information and the fourth coordinate information respectively, is the relationship for the second longest straight line, is the independent variable.

[0012] A further improvement of the present invention is that in the step of determining the first distance and the second distance based on the coordinate origin and the first long straight line and the second long straight line, the coordinate origin and the first long straight line and the second long straight line specifically use a point-to-straight line distance formula to determine the first distance and the second distance.

[0013] In a second aspect, the present invention provides a system for measuring the symmetry of even-numbered short keyways of a motor housing, comprising a reference circle construction module, a first coordinate information acquisition module, a first long straight line construction module, a second coordinate information acquisition module, a second long straight line construction module, a distance determination module, and a motor housing even-numbered short keyway symmetry determination module; The reference circle construction module is used to obtain the circular coordinate information of the motor housing, and use the obtained circular coordinate information of the motor housing to construct the reference circle and determine the coordinate origin; The first coordinate information acquisition module is used to acquire first coordinate information on one side of the even-numbered short key slots of the motor housing and second coordinate information on the same side of the even-numbered short key slots of the motor housing in the set degree direction of the motor housing; The first long straight line construction module is used to construct a first long straight line using the first coordinate information and the second coordinate information; The second coordinate information acquisition module is used to acquire the third coordinate information of the other side of the even-numbered short key slot of the motor housing and the fourth coordinate information of the same side of the even-numbered short key slot of the motor housing in the set degree direction of the motor housing; The second long straight line construction module is used to construct a second long straight line using the third coordinate information and the fourth coordinate information; The distance determination module is used to determine the first distance and the second distance respectively according to the coordinate origin and the first long straight line and the second long straight line; The motor housing even-numbered short keyway symmetry determination module is used to obtain the symmetry of the motor housing even-numbered short keyway by subtracting the obtained first distance from the second distance.

[0014] A further improvement of the present invention is that the range of the setting degree is .

[0015] In a third aspect, the present invention provides an electronic device including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method for measuring the symmetry of even short keyways of a motor casing as described above when executing the computer program.

[0016] In a fourth aspect, the present invention provides a storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method for measuring the symmetry of even-numbered short keyways of a motor casing as described above.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention is an improved invention. Compared with the existing method for measuring the symmetry of the even short keyway of the motor housing, on the one hand, in addition to obtaining the first coordinate information on one side of the even short keyway of the motor housing, the present invention also obtains the second coordinate information on the same side of the even short keyway of the motor housing in the direction of the set degree of the motor housing, thereby improving the comprehensiveness of data collection and the accuracy of the subsequent symmetry measurement of the even short keyway. In addition, the present invention first constructs a reference circle when calculating the symmetry of the even short keyway. On the one hand, after the reference circle is constructed, the measurement work can be simplified to the measurement of the relationship between the reference circle and the measured element (symmetry of the even short keyway), thereby simplifying the measurement process. On the other hand, the constructed reference circle can serve as an accurate reference standard, which can also improve the accuracy of the symmetry measurement of the even short keyway, thereby effectively solving the problem in the prior art that the part of the short keyway boundary that can be selected is too short to obtain only a point instead of a straight line, and the symmetry cannot be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of the method for measuring the symmetry of even-numbered short keyways of a motor housing of the present invention; Figure 2 A schematic diagram of a system for measuring the symmetry of even-numbered short keyways of a motor housing according to the present invention; Figure 3 It is a schematic structural diagram of the electronic device of the present invention. DETAILED DESCRIPTION

[0019] In order to further understand the content of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0020] The present invention proposes a method for measuring the symmetry of the even-numbered short keyways of a motor housing, wherein a first distance and a second distance are determined according to the coordinate origin and the first long straight line and the second long straight line, and the obtained first distance and the second distance are subtracted to obtain the symmetry of the even-numbered short keyways of the motor housing. Compared with the prior art, the present invention effectively solves the problem that the part of the short keyway boundary that can be selected in the prior art is too short to obtain only a point instead of a straight line, and the symmetry cannot be obtained.

[0021] Embodiment 1: The flow chart of the method for measuring the symmetry of even-numbered short keyways of the motor housing of the present invention is as follows: Figure 1 As shown, a method for measuring the symmetry of even-numbered short keyways of a motor housing of the present invention comprises the following steps: S1. Obtain the circular coordinate information of the motor housing, and use the obtained circular coordinate information of the motor housing to construct a reference circle and determine the coordinate origin.

[0022] S2. Obtain the first coordinate information of one side of the even-numbered short key slot of the motor housing and the second coordinate information of the same side of the even-numbered short key slot of the motor housing in the set degree direction of the motor housing.

[0023] S3. Construct a first long straight line using the first coordinate information and the second coordinate information.

[0024] S4. Obtain the third coordinate information of the other side of the even-numbered short key slot of the motor housing and the fourth coordinate information of the same side of the even-numbered short key slot of the motor housing in the set degree direction of the motor housing.

[0025] S5. Construct a second long straight line using the third coordinate information and the fourth coordinate information.

[0026] S6. Determine the first distance and the second distance according to the coordinate origin and the first long straight line and the second long straight line respectively.

[0027] S7. Subtract the obtained first distance from the second distance to obtain the symmetry of the even-numbered short keyways of the motor housing.

[0028] Embodiment 2: The schematic diagram of the measurement system of the symmetry of the even-numbered short keyways of the motor housing of the present invention is as follows: Figure 2 As shown, the measurement system for the symmetry of the even-numbered short keyways of the motor casing of the present invention includes a reference circle construction module, a first coordinate information acquisition module, a first long straight line construction module, a second coordinate information acquisition module, a second long straight line construction module, a distance determination module and a motor casing even-numbered short keyway symmetry determination module.

[0029] The reference circle construction module is used to obtain the circular coordinate information of the motor housing, and use the obtained circular coordinate information of the motor housing to construct the reference circle and determine the coordinate origin.

[0030] The first coordinate information acquisition module is used to acquire first coordinate information on one side of the even-numbered short key slots of the motor housing and second coordinate information on the same side of the even-numbered short key slots of the motor housing in a set degree direction of the motor housing.

[0031] The first long straight line construction module is used to construct a first long straight line using the first coordinate information and the second coordinate information.

[0032] The second coordinate information acquisition module is used to acquire the third coordinate information of the other side of the even-numbered short key slot of the motor housing and the fourth coordinate information of the same side of the even-numbered short key slot of the motor housing in the set degree direction of the motor housing.

[0033] The second long straight line construction module is used to construct the second long straight line using the third coordinate information and the fourth coordinate information.

[0034] The distance determination module is used to determine the first distance and the second distance respectively according to the coordinate origin and the first long straight line and the second long straight line.

[0035] The module for determining the symmetry of the even-numbered short keyways of the motor housing is used to obtain the symmetry of the even-numbered short keyways of the motor housing by subtracting the obtained first distance from the obtained second distance.

[0036] Embodiment 3: S1. Obtain the circular coordinate information of the motor housing, and use the obtained circular coordinate information of the motor housing to construct a reference circle and determine the coordinate origin.

[0037] Specifically, in this step, the obtained circular coordinate information of the motor housing is used to construct a reference circle according to the least squares method.

[0038] Set the X coordinate to zero, the Y coordinate to zero, and the Z coordinate to zero, and determine the center of the circle as the coordinate origin (0,0,0).

[0039] S2. Obtain the first coordinate information of one side of the even-numbered short key slot of the motor housing and the second coordinate information of the same side of the even-numbered short key slot of the motor housing in the set degree direction of the motor housing.

[0040] Specifically, first coordinate information on one side of the even-numbered short key slots of the motor housing and second coordinate information on the same side of the even-numbered short key slots of the motor housing in a 180-degree direction of the motor housing are obtained.

[0041] S3. Construct a first long straight line using the first coordinate information and the second coordinate information.

[0042] Specifically, the calculation formula of the first long straight line L1 in this step is:

[0043] in,( )and( ) are the first coordinate information and the second coordinate information respectively, is the relationship of the first long straight line L1, is the independent variable.

[0044] S4. Obtain the third coordinate information of the other side of the even-numbered short key slot of the motor housing and the fourth coordinate information of the same side of the even-numbered short key slot of the motor housing in the set degree direction of the motor housing.

[0045] Obtain the third coordinate information of the other side of the even-numbered short key slot of the motor housing and the fourth coordinate information of the same side of the even-numbered short key slot of the motor housing in the 180-degree direction of the motor housing.

[0046] S5. Construct a second long straight line using the third coordinate information and the fourth coordinate information.

[0047] Specifically, the calculation formula of the second longest straight line L2 in this step is:

[0048] in,( )and( ) are the third coordinate information and the fourth coordinate information respectively, is the relationship of the second longest straight line L2, is the independent variable.

[0049] S6. Determine the first distance and the second distance according to the coordinate origin and the first long straight line and the second long straight line respectively.

[0050] Specifically, the first distance is determined by using the point-to-straight-line distance formula based on the coordinate origin (0,0,0) and the first long straight line L1. , determine the second distance based on the coordinate origin (0,0,0) and the second longest straight line L2 using the point-to-straight line distance formula .

[0051] S7. Subtract the obtained first distance from the second distance to obtain the symmetry of the even-numbered short keyways of the motor housing.

[0052] The first distance and the second distance Make a difference and get the symmetry of the even-numbered short keyways of the motor housing.

[0053] In this embodiment, the 180 degrees in the 180 degree direction can be set according to actual needs, and the setting range is .

[0054] In order to verify the effectiveness of the method for measuring the symmetry of the even-numbered short keyways of a motor casing proposed in the present invention, this embodiment uses the method proposed in the present invention to measure the symmetry of the even-numbered short keyways (specifically 12 slots) of a permanent magnet DC torque motor casing. The maximum symmetry measured by the method proposed in the present invention is 0.03 mm, and the symmetry in actual processing and manufacturing is 0.025 mm. The maximum error between the symmetry measured by the method proposed in the present invention and the symmetry in actual processing and manufacturing is 0.005 mm, which is relatively small, proving the effectiveness of the method for measuring the symmetry of the even-numbered short keyways of a motor casing proposed in the present invention.

[0055] Embodiment 4: See also Figure 3 As shown, the present invention also provides an electronic device 100 for measuring the symmetry of even short keyways of a motor casing; the electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.

[0056] The memory 101 can be used to store the computer program 103, and the processor 102 implements the steps of the method for measuring the symmetry of the even short keyway of the motor housing described in Example 1 by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data (such as audio data) created according to the use of the electronic device 100, etc. In addition, the memory 101 can include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0057] The at least one processor 102 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 may be a microprocessor or any conventional processor, etc. The processor 102 is the control center of the electronic device 100, and uses various interfaces and lines to connect various parts of the entire electronic device 100.

[0058] The memory 101 in the electronic device 100 stores a plurality of instructions to implement a method for measuring the symmetry of even-numbered short keyways of a motor housing, and the processor 102 can execute the plurality of instructions to implement: Obtaining circular coordinate information of the motor housing, and using the obtained circular coordinate information of the motor housing to construct a reference circle and determine the coordinate origin; Obtain first coordinate information on one side of the even-numbered short key slot of the motor housing and second coordinate information on the same side of the even-numbered short key slot of the motor housing in the set degree direction of the motor housing; Constructing a first long straight line using the first coordinate information and the second coordinate information; Obtain the third coordinate information of the other side of the even-numbered short key slot of the motor housing and the fourth coordinate information of the same side of the even-numbered short key slot of the motor housing in the set degree direction of the motor housing; constructing a second long straight line using the third coordinate information and the fourth coordinate information; Determine a first distance and a second distance respectively according to the coordinate origin and the first long straight line and the second long straight line; The difference between the first distance and the second distance is obtained to obtain the symmetry of the even-numbered short keyways of the motor housing.

[0059] Embodiment 5: If the module / unit integrated in the electronic device 100 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory and read-only memory (ROM, Read-Only Memory).

[0060] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0061] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0062] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0063] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for measuring the symmetry of even-numbered short keyways of a motor housing, characterized in that: The following steps are involved: Obtaining circular coordinate information of the motor housing, and using the obtained circular coordinate information of the motor housing to construct a reference circle and determine the coordinate origin; Acquire the first coordinate information of one side of the even-numbered short key slot of the motor housing and the second coordinate information of the same side of the even-numbered short key slot of the motor housing in the set degree direction of the motor housing; Constructing a first long straight line using the first coordinate information and the second coordinate information; Obtain the third coordinate information of the other side of the even-numbered short key slot of the motor housing and the fourth coordinate information of the same side of the even-numbered short key slot of the motor housing in the set degree direction of the motor housing; constructing a second long straight line using the third coordinate information and the fourth coordinate information; Determine a first distance and a second distance respectively according to the coordinate origin and the first long straight line and the second long straight line; The difference between the first distance and the second distance is obtained to obtain the symmetry of the even-numbered short keyways of the motor housing.

2. The method for measuring the symmetry of even-numbered short keyways of a motor housing according to claim 1, characterized in that: In the step of obtaining the circular coordinate information of the motor housing, and using the obtained circular coordinate information of the motor housing to construct a reference circle and determine the coordinate origin, the reference circle is specifically constructed using the obtained circular coordinate information of the motor housing according to the least squares method.

3. The method for measuring the symmetry of even-numbered short keyways of a motor housing according to claim 1, characterized in that: The range of the setting degree is .

4. The method for measuring the symmetry of even-numbered short keyways of a motor housing according to claim 1, characterized in that: In the step of constructing the first long straight line using the first coordinate information and the second coordinate information, the calculation formula of the first long straight line is: in,( )and( ) are the first coordinate information and the second coordinate information respectively, is the relationship of the first longest straight line, is the independent variable.

5. The method for measuring the symmetry of even-numbered short keyways of a motor housing according to claim 1, characterized in that: In the step of constructing the second longest straight line using the third coordinate information and the fourth coordinate information, the calculation formula of the second longest straight line is: in,( )and( ) are the third coordinate information and the fourth coordinate information respectively, is the relationship for the second longest straight line, is the independent variable.

6. The method for measuring the symmetry of even-numbered short keyways of a motor housing according to claim 1, characterized in that: In the step of determining the first distance and the second distance according to the coordinate origin and the first long straight line and the second long straight line, the coordinate origin and the first long straight line and the second long straight line specifically use a point-to-straight line distance formula to determine the first distance and the second distance.

7. A system for measuring the symmetry of even-numbered short keyways of a motor housing, characterized in that: It includes a reference circle construction module, a first coordinate information acquisition module, a first long straight line construction module, a second coordinate information acquisition module, a second long straight line construction module, a distance determination module and a motor housing even short keyway symmetry determination module; The reference circle construction module is used to obtain the circular coordinate information of the motor housing, and use the obtained circular coordinate information of the motor housing to construct the reference circle and determine the coordinate origin; The first coordinate information acquisition module is used to acquire first coordinate information on one side of the even-numbered short key slots of the motor housing and second coordinate information on the same side of the even-numbered short key slots of the motor housing in the set degree direction of the motor housing; The first long straight line construction module is used to construct a first long straight line using the first coordinate information and the second coordinate information; The second coordinate information acquisition module is used to acquire the third coordinate information of the other side of the even-numbered short key slot of the motor housing and the fourth coordinate information of the same side of the even-numbered short key slot of the motor housing in the set degree direction of the motor housing; The second long straight line construction module is used to construct a second long straight line using the third coordinate information and the fourth coordinate information; The distance determination module is used to determine the first distance and the second distance respectively according to the coordinate origin and the first long straight line and the second long straight line; The motor housing even-numbered short keyway symmetry determination module is used to obtain the symmetry of the motor housing even-numbered short keyway by subtracting the obtained first distance from the second distance.

8. The system for measuring the symmetry of even-numbered short keyways of a motor housing according to claim 7, characterized in that: The range of the setting degree is .

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for measuring the symmetry of the even-numbered short keyways of the motor housing according to any one of claims 1 to 6 are implemented.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for measuring the symmetry of the even-numbered short keyways of a motor housing according to any one of claims 1 to 6 are implemented.

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