A measuring tool and method for measuring the angle after the motor housing and stator are assembled.

Abstract

This invention discloses a measuring tool and method for measuring the angle between a motor housing and a stator after assembly, belonging to the field of angle measurement technology. It includes a positioning device and a detection device. The detection device is rotatably mounted on a base plate via a turntable. The upper surface of the base plate is provided with a circumferential scale. The rotation axis of the turntable passes through the center of the circumferential scale. A pointer is provided on the turntable. The angle between the motor housing and the stator can be measured by the pointer and the circumferential scale. The detection device is provided with a stop corresponding to the reference mark on the stator. The projections of the stop, the pointer, and the rotation axis of the turntable onto the base plate are on the same straight line. The measuring rod of the positioning device is positioned with a positioning hole on the motor housing, so that the positioning hole corresponds to the zero mark of the circumferential scale, and the scale corresponding to the pointer is the angle between the motor housing and the stator. This invention solves the problems of low measurement efficiency and inaccurate measurement results of existing angle measuring tools.

Description

Technical Field

[0001] This invention belongs to the field of angle measurement technology, specifically relating to a measuring tool and method for measuring the angle after the motor housing and stator are assembled. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] With the development of new energy vehicles, industrial servo drives, and high-end home appliances, the performance requirements for brushless DC motors and permanent magnet synchronous motors are increasing. The assembly precision between the motor housing and the stator, especially the relative angle between them, directly affects the motor's electrical performance, mechanical installation adaptability, and control precision, becoming a key control parameter in the production of high-reliability motors.

[0004] Traditional motor assembly processes typically focus on the coaxiality, axial position, and pressing force of the stator and housing, but often neglect the control of their relative angle in the circumferential direction. However, the direction of the magnetic field generated by the stator windings after energization must maintain a precise correspondence with the mounting reference on the housing. If there is a deviation in the assembly angle, the variable frequency compressor, with its wide speed range and frequent starts, will experience significant vibration and noise due to the large angle deviation. Simultaneously, the phase sequence of the three-phase leads may be disordered, causing the motor to reverse, stall, or burn out the windings. Angle deviations can also lead to wire harness pulling, component interference, or even assembly failure. Furthermore, excessively long leads can cause them to touch the housing, burning through the insulation and resulting in poor insulation. Based on these issues, it is clear that measuring the angle between the motor housing and stator is extremely important. However, current technology has not designed a dedicated angle measuring device for this purpose, resulting in low measurement efficiency and measurement results that fail to meet product calibration standards. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a measuring tool and method for measuring the angle after the motor housing and stator are assembled, which solves the problems of low measurement efficiency and inaccurate measurement results of existing angle measuring tools.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, the present invention provides a measuring tool for measuring the angle between a motor housing and a stator after assembly, comprising: a positioning device and a detection device; the detection device is rotatably mounted on a base plate via a turntable, the upper surface of the base plate is provided with a circumferential scale, the rotation axis of the turntable passes through the center of the circumferential scale, and a pointer is provided on the turntable; the detection device is provided with a stop corresponding to a reference mark on the stator, and the projections of the stop, the pointer, and the rotation axis of the turntable on the base plate are on the same straight line, such that the scale corresponding to the stop is the same as the scale corresponding to the pointer; the measuring rod of the positioning device is positioned with a positioning hole on the motor housing, such that the positioning hole is aligned with the zero mark of the circumferential scale, and the scale corresponding to the pointer is the angle value between the motor housing and the stator.

[0007] As a further implementation, the circumferential scale consists of 360 scale lines, with an included angle of 1° between adjacent scale lines, thus enabling the measurement of any angle after the motor housing and stator are assembled.

[0008] As a further implementation, a rotating shaft is provided at the lower part of the turntable, and the rotating shaft is mounted on the base plate by bearings; the circumferential scale is distributed at the edge of the turntable to facilitate reading the scale corresponding to the pointer.

[0009] As a further implementation, a connecting seat is coaxially arranged on the turntable, and a measuring seat is coaxially arranged above the connecting seat. The measuring seat provides support for the assembled motor housing and stator. The retaining edge is arranged on the measuring seat, and when the stator is installed on the measuring seat, the retaining edge is kept in correspondence with the reference mark.

[0010] As a further implementation, a pin and a fastener are provided between the turntable, the connecting seat, and the measuring seat. The pin is disposed through the turntable, the connecting seat, and the measuring seat, so that the turntable, the connecting seat, and the measuring seat are always in a coaxial state. The fastener fixes the turntable and the connecting seat, and also fixes the connecting seat and the measuring seat.

[0011] As a further implementation, the measuring base includes a base mounted on a connecting base, a support ring disposed on the base, the lower edge of the support ring being connected to the base, and a retaining edge disposed on the upper edge of the support ring.

[0012] As a further implementation, the retaining edge is a raised structure with a horizontal cross-sectional shape of triangle, M-shape, trapezoid, or square; the reference mark is set at the edge position where the stator contacts the support ring, and the reference mark is a groove adapted to the shape of the retaining edge.

[0013] As a further implementation, the positioning device includes a fixed base mounted on a base plate, two guide rods vertically mounted on the fixed base, a slider mounted on the guide rod, a measuring rod horizontally slidably mounted on the slider, and the measuring rod being arranged between the two guide rods.

[0014] As a further implementation, the lower part of the base plate is provided with a plurality of base columns, which are fixedly connected to the base plate by fasteners.

[0015] Secondly, the present invention also provides a method for measuring the angle of an electric motor housing after it is assembled with the stator, comprising the following steps: Vertically place the assembled motor housing and stator assembly onto the measuring base. During this process, ensure that the turntable does not rotate. Rotate the motor housing and stator assembly and observe the reference mark on the stator. When the stator reference mark couples with the stop edge on the measuring base, the workpiece being measured has been placed in place. Rotate the positioning hole on the housing to the direction of the measuring rod, slide the slider upward to the same height as the positioning hole, and then push the measuring rod into the hole in the housing. The scale indicated by the pointer at this time is the angle between the housing and the stator after assembly. The angle between the housing and the stator after assembly should be controlled within the range of 90±1° to avoid excessive deviation of the angle between the motor housing and the stator after assembly, thereby ensuring the performance and reliability of the motor.

[0016] Compared with the prior art, the advantages and positive effects of this invention are: The detection device of this invention is mounted on a base plate via a turntable. The upper surface of the base plate has a circumferential scale, and the rotation axis of the turntable passes through the center of this scale, facilitating the reading of the scale corresponding to the pointer and ensuring the accuracy of the angle read by the pointer. By rotating the measuring base, the measuring rod fixes the positioning hole on the motor housing at the 0-degree mark. Since the measuring rod and the scale pointer are linked, when the measuring rod is inserted into the positioning hole, the pointer stops rotating. At this point, the scale indicated by the pointer directly reflects the circumferential angle between the positioning hole of the housing and the stator reference, which is the actual assembly angle between the motor housing and the stator. By zeroing the positioning hole to 0° and aligning the flange with the stator reference mark, direct and rapid reading of the relative angle between the housing and the stator is achieved, improving the efficiency of angle measurement while ensuring the accuracy of the angle measurement. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] Figure 1 This is a cross-sectional view of the angle measuring instrument of the present invention; Figure 2This is a top view of the angle measuring instrument of the present invention; Figure 3 This is a structural diagram of the angle measuring instrument of the present invention, which includes a stator and a housing. Figure 4 This is a top view of the measuring base of the present invention; Figure 5 This is a top view of the stator and housing structure of the present invention.

[0019] In the diagram: 1. Measuring base; 2. Pin; 3. Connecting seat; 4. Turntable; 5. Pointer; 6. Base plate; 7. Slider; 8. Measuring rod; 9. Guide rod; 10. Fixing seat; 11. Base column; 12. Bearing; 13. Rotating shaft; 14. Circumferential scale; 15. Edge stop. Detailed Implementation

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. Example 1 This embodiment discloses a measuring tool for measuring the angle after the motor housing and stator are assembled, such as... Figure 1 - Figure 5 As shown, it includes: a positioning device and a detection device; the detection device is rotatably mounted on a base plate 6 via a turntable 4, the upper surface of the base plate 6 is provided with a circumferential scale 14, the rotation axis 13 of the turntable 4 passes through the center of the circumferential scale 14, and a pointer 5 is provided on the turntable 4; the detection device is provided with a retaining edge 15 corresponding to the reference mark of the stator, the projections of the retaining edge 15, the pointer 5 and the rotation axis 13 of the turntable 4 on the base plate 6 are on the same straight line, so that the scale corresponding to the retaining edge 15 is the same as the scale corresponding to the pointer 5; the measuring rod 8 of the positioning device is positioned with the positioning hole on the motor housing, so that the positioning hole is directly opposite the zero mark of the circumferential scale 14, so that the scale corresponding to the pointer 5 is the angle value between the motor housing and the stator.

[0022] Understandably, the testing device is mounted on the base plate 6 via a turntable 4. The upper surface of the base plate 6 has a circular scale 14, and the rotation axis 13 of the turntable 4 passes through the center of this scale 14, facilitating the reading of the scale corresponding to the pointer 5 and ensuring the accuracy of the angle read by the pointer 5. The positioning hole on the motor housing is fixed at the 0-scale position by rotating the measuring base 1 via the measuring rod 8. Since the measuring rod 8 is linked to the scale pointer 5, when the measuring rod 8 is inserted into the positioning hole, the pointer 5 stops rotating. At this point, the scale indicated by the pointer 5 directly reflects the circumferential angle between the positioning hole of the housing and the stator reference, which is the actual assembly angle between the motor housing and the stator.

[0023] The detection device achieves direct and rapid reading of the relative angle between the housing and the stator by aligning the positioning hole to zero and the stop edge 15 with the stator reference mark, using the pointer 5. This improves the efficiency of angle measurement while ensuring the accuracy of angle measurement. It can quickly complete the measurement and reading of angles without the need for complex electrical sensors or vision systems, reducing equipment costs and the skill requirements for operators.

[0024] As a further implementation, the circumferential scale 14 consists of 360 scale lines, with an included angle of 1° between adjacent scale lines, thus enabling the measurement of any angle after the motor housing and stator are assembled.

[0025] The full-circle indexing system consisting of 360 scale lines enables the device to measure any angle after the housing and stator are assembled, not just a specific preset angle, greatly expanding the applicable scenarios and meeting the diverse requirements of different motor models for assembly angles. Secondly, each scale line corresponds to a 1° division value, which avoids the manufacturing costs caused by excessively high precision while ensuring the detection of conventional motor assembly angles.

[0026] The circumferential scale 14 allows for on-site intuitive judgment of whether the angle is out of tolerance. It can quickly complete the measurement and reading of the angle without the need for complex electrical sensors or vision systems, thus reducing equipment costs.

[0027] As a further implementation, a rotating shaft 13 is provided at the lower part of the turntable 4, and the rotating shaft 13 is mounted on the base plate 6 through a bearing 12; the circumferential scale 14 is distributed at the edge of the turntable 4 to facilitate reading the scale corresponding to the pointer 5.

[0028] Understandably, the lower part of the turntable 4 is mounted on the base plate 6 via the rotating shaft 13 and the bearing 12, forming a low-friction, high-precision slewing bearing structure. This not only ensures a smooth and stable rotation process and avoids the impact of jamming or shaking on positioning accuracy, but also enhances the overall rigidity and long-term stability of the device.

[0029] In addition, the circumferential scale 14 is directly distributed on the edge of the turntable 4, forming a close correspondence with the pointer 5. The operator can read the angle value intuitively without bending over or using auxiliary tools, which effectively reduces reading errors and improves detection efficiency.

[0030] like Figure 1 As shown, a connecting seat 3 is coaxially mounted on the turntable 4, and a measuring seat 1 is coaxially mounted above the connecting seat 3. The measuring seat 1 provides support for the assembled motor housing and stator. A retaining edge 15 is mounted on the measuring seat 1, so that when the stator is installed on the measuring seat 1, the retaining edge 15 corresponds to the reference mark. This realizes the conversion of the angle and position relationship between the stator and the measuring seat 1. Since the stator is fixed in the measuring seat 1, its position cannot be directly read from the outside. By using the correspondence between the pointer 5 and the stator position, the reading of the stator is mapped to the reading of the pointer 5, making the corresponding angle of the stator more intuitive.

[0031] As a further implementation, a pin 2 and a fastener are provided between the turntable 4, the connecting seat 3 and the measuring seat 1. The pin 2 is disposed through the turntable 4, the connecting seat 3 and the measuring seat 1, so that the turntable 4, the connecting seat 3 and the measuring seat 1 are always in a coaxial state. The fastener fixes the turntable 4 and the connecting seat 3, and also fixes the connecting seat 3 and the measuring seat 1.

[0032] Understandably, the pin 2 is installed through the turntable 4, connecting seat 3, and measuring seat 1 to ensure that the turntable 4, connecting seat 3, and measuring seat 1 are always coaxial, thus achieving accurate angle measurement; the angular relationship when the stator reference mark is aligned with the flange 15, and the 0° reference provided by the measuring rod 8 through the positioning hole, enable the measurement of the relative angle between the outer shell and the stator, avoiding additional errors introduced by eccentricity. At the same time, fasteners fix the turntable 4 to the connecting seat 3 and the connecting seat 3 to the measuring seat 1 respectively, ensuring that the components do not loosen or shift relative to each other during rotation and measurement.

[0033] The measuring base 1 includes a base mounted on a connecting base 3, a support ring provided on the base, the lower edge of the support ring being connected to the base, and a retaining edge 15 being provided on the upper edge of the support ring.

[0034] like Figure 4 As shown, the retaining edge 15 is a raised structure with a horizontal cross-sectional shape of triangle, M-shape, trapezoid, or square; the reference mark is set at the edge position where the stator contacts the support ring, and the reference mark is a groove that matches the shape of the retaining edge 15.

[0035] The retaining edge 15 on the measuring base 1 is designed as a raised structure with a triangular, M-shaped, trapezoidal, or square cross-section, while the edge where the stator contacts the support ring is provided with a groove that matches its shape. When the operator rotates the motor housing and stator assembly, the groove and raised structure achieve precise alignment through shape coupling. Compared to simple line or point alignment, this shape-matched concave-convex fit produces a clear tactile or stopping feel when the groove slides into the raised structure, avoiding the interpretation error caused by manual visual alignment. After the groove and raised structure are engaged, the stator and measuring base 1 are reliably locked in the circumferential direction, preventing the relationship between the pointer 5 and the stator from being miscorresponding, and ensuring that the scale indicated by the pointer 5 when the measuring rod 8 is inserted into the positioning hole can accurately reflect the assembly angle between the housing and the stator.

[0036] As a further implementation, the positioning device includes a fixed base 10 mounted on a base plate 6, with two guide rods 9 vertically mounted on the fixed base 10, a slider 7 mounted on the guide rods 9, and a measuring rod 8 horizontally slidably mounted on the slider 7, the measuring rod 8 being arranged between the two guide rods 9.

[0037] In addition to converting angle measurement into linear scale readings for rapid measurement, this invention, in conjunction with the sliding mechanism of slider 7 and measuring rod 8, can adapt to the height of positioning holes on housings of different sizes, thus possessing a certain degree of versatility.

[0038] The lower part of the base plate 6 is also provided with a plurality of base columns 11, which are fixedly connected to the base plate 6 by fasteners to provide stable support for the base plate 6.

[0039] Example 2 This embodiment discloses a measurement method for measuring the angle of a motor housing and stator after assembly, comprising the following steps: The assembled motor housing and stator assembly are vertically placed on the measuring base 1. During this process, it is necessary to ensure that the turntable 4 does not rotate. Rotate the motor housing and stator assembly and observe the reference mark on the stator. When the stator reference mark is coupled with the stop edge 15 on the measuring base 1, the workpiece being measured has been placed in place. Rotate the positioning hole on the housing to the direction of the measuring rod 8, slide the slider 7 upward to the same height as the positioning hole, and then push the measuring rod 8 into the hole in the housing. At this time, the scale pointed to by the pointer 5 is the angle after the housing and stator are assembled. The angle between the housing and stator after assembly should be within the range of 90±1° to avoid excessive deviation of the angle between the motor housing and stator after assembly, thereby ensuring the performance and reliability of the motor.

[0040] The core measurement principle of the measuring device of this invention is to establish a unified mechanical reference and convert the implicit relative angular relationship between the motor housing and the stator into a readable scale value. Specifically, the assembled motor housing and stator assembly is vertically fitted onto the measuring base 1; the motor housing and stator assembly are rotated so that the reference mark on the stator is aligned and coupled with the flange 15 on the measuring base 1, at which point the angle of the stator relative to the measuring base 1 is uniquely determined. Based on this, using the positioning hole on the housing as another reference object, the sliding slider 7 is used to adjust the measuring rod 8 to a position equal to the positioning hole, and then it is horizontally pushed into the positioning hole. By rotating the measuring base 1, the positioning hole on the motor housing is fixed at the 0-scale position by the measuring rod 8. Since the measuring rod 8 is linked with the scale pointer 5, when the measuring rod 8 is inserted into the positioning hole, the pointer 5 stops rotating. At this time, the scale indicated by the pointer 5 directly reflects the circumferential angle between the positioning hole of the housing and the stator reference, that is, the actual angle after the two are assembled.

[0041] The assembly angle is controlled within 90±1° as a pass criterion. If the deviation exceeds the tolerance, it can be identified on-site, thereby effectively avoiding problems such as rotor position detection errors and commutation inaccuracies caused by excessive angle deviation. This ensures the assembly quality and long-term operational reliability of the motor from the source.

[0042] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A measuring tool for measuring the angle after the motor housing and stator are assembled, characterized in that, include: A positioning device and a detection device are provided. The detection device is rotatably mounted on a base plate via a turntable. The upper surface of the base plate is provided with a circumferential scale. The rotation axis of the turntable passes through the center of the circumferential scale. A pointer is provided on the turntable. The detection device is provided with a stop corresponding to the reference mark of the stator. The projections of the stop, the pointer, and the rotation axis of the turntable on the base plate are on the same straight line, so that the scale corresponding to the stop is the same as the scale corresponding to the pointer. The measuring rod of the positioning device is positioned with the positioning hole on the motor housing, so that the positioning hole is aligned with the zero mark of the circumferential scale, and the scale corresponding to the pointer is the angle value between the motor housing and the stator.

2. The measuring tool for measuring the angle after assembling the motor housing and stator as described in claim 1, characterized in that, The circumferential scale consists of 360 graduation lines, with an angle of 1° between adjacent graduation lines, thus enabling the measurement of any angle after the motor housing and stator are assembled.

3. The measuring tool for measuring the angle after assembling the motor housing and stator as described in claim 2, characterized in that, The turntable is provided with a rotating shaft at its lower part, and the rotating shaft is mounted on the base plate by bearings; the circumferential scale is distributed at the edge of the turntable to facilitate reading the scale corresponding to the pointer.

4. The measuring tool for measuring the angle after assembling the motor housing and stator as described in claim 3, characterized in that, A connecting seat is coaxially arranged on the turntable, and a measuring seat is coaxially arranged above the connecting seat. The measuring seat provides support for the assembled motor housing and stator. A retaining edge is arranged on the measuring seat, and when the stator is installed on the measuring seat, the retaining edge is kept in correspondence with the reference mark.

5. The measuring tool for measuring the angle after assembling the motor housing and stator as described in claim 4, characterized in that, A pin and a fastener are provided between the turntable, the connecting seat, and the measuring seat. The pin passes through the turntable, the connecting seat, and the measuring seat, so that the turntable, the connecting seat, and the measuring seat are always in a coaxial state. The fastener fixes the turntable and the connecting seat, as well as the connecting seat and the measuring seat.

6. The measuring tool for measuring the angle after the motor housing and stator are assembled, as described in claim 5, is characterized in that... The measuring base includes a base mounted on a connecting base, a support ring provided on the base, the lower edge of the support ring being connected to the base, and a retaining edge provided on the upper edge of the support ring.

7. The measuring tool for measuring the angle after the motor housing and stator are assembled as described in claim 1, characterized in that, The flange is a raised structure with a horizontal cross-sectional shape of triangle, M-shape, trapezoid, or square; the reference mark is set at the edge position where the stator contacts the support ring, and the reference mark is a groove that matches the shape of the flange.

8. The measuring tool for measuring the angle after the motor housing and stator are assembled as described in claim 1, characterized in that, The positioning device includes a fixed base mounted on a base plate, two guide rods vertically mounted on the fixed base, a slider mounted on the guide rod, a measuring rod horizontally mounted on the slider, and the measuring rod arranged between the two guide rods.

9. The measuring tool for measuring the angle after assembling the motor housing and stator as described in claim 1, characterized in that, The lower part of the base plate is also provided with a number of base columns, which are fixedly connected to the base plate by fasteners.

10. A measurement method for measuring the angle of a motor housing and stator after assembly, as described in any one of claims 1-9, characterized in that... Includes the following steps: Vertically place the assembled motor housing and stator assembly onto the measuring base. During this process, ensure that the turntable does not rotate. Rotate the motor housing and stator assembly and observe the reference mark on the stator. When the stator reference mark couples with the stop edge on the measuring base, the workpiece being measured has been placed in place. Rotate the positioning hole on the housing to the direction of the measuring rod, slide the slider upward to the same height as the positioning hole, and then push the measuring rod into the hole in the housing. The scale indicated by the pointer at this time is the angle between the housing and the stator after assembly. The angle between the housing and the stator after assembly should be controlled within the range of 90±1° to avoid excessive deviation of the angle between the motor housing and the stator after assembly, thereby ensuring the performance and reliability of the motor.

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