Eddy current sensor

Abstract

The utility model discloses an eddy current sensor, which comprises a shell, the shell comprises a bottom plate, the bottom plate comprises an annular plate and a connecting plate formed at one end of the annular plate, an arc-shaped outer annular plate is formed on the outer side of the bottom plate, one surface of the outer annular plate is flush with the bottom plate, four convex positioning plates are uniformly formed on the outer side of the outer annular plate, and the outer surface of the outer annular plate is flush with the bottom plate. A plurality of positioning plates are arranged on the outer ring plate, through holes are formed in the positioning plates, positioning rings are embedded in the two through holes in the same diameter, positioning protrusions are formed on the positioning rings, the positioning protrusions are located on the flush plane of the outer ring plate and the bottom plate, and the other sides of the positioning rings are flush with the positioning plates. The positioning protrusions on the positioning ring are used for positioning the installation position of the eddy current sensor on the motor shell, so that the position of the eddy current sensor is kept accurate, the installation positioning accuracy and the installation efficiency of the eddy current sensor are improved, and the detection accuracy is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to an eddy current sensor. Background Art

[0002] Currently, all new energy vehicles on the market are powered by electric motors. Depending on their structure and positioning, each vehicle is equipped with one to three motors. Over 95% of these motors are permanent magnet synchronous motors, which require precise control of the phase synchronization between the alternating magnetic field and the rotation of the rotor magnets. This places high demands on the power density and efficiency of the entire vehicle's motors. For motors, high accuracy is required for rotor detection and rotor position. The motor rotor position sensor was developed to address this problem.

[0003] The motor rotor position sensor is generally installed inside the motor housing. It helps the controller control the start, stop, acceleration, deceleration and steering of the motor by detecting the rotor position, thereby controlling the running state of the motor. The motor rotor position sensor is generally fixed in the housing and connected to the housing by fasteners. However, the different tightening depths of the fasteners will cause the motor rotor position sensor to tilt, affecting the detection accuracy. Utility Model Content

[0004] The purpose of the present utility model is to provide an eddy current sensor. By arranging a positioning ring on a positioning plate, the positioning protrusion on the positioning ring is used to position the installation position of the eddy current sensor on the motor housing, so that the position of the eddy current sensor is kept accurate, the installation positioning accuracy and installation efficiency of the eddy current sensor are improved, and the detection accuracy is further improved.

[0005] The utility model provides the following technical solution: an eddy current sensor, comprising a shell, the shell comprising a base plate, the base plate comprising an annular plate and a connecting plate formed at one end of the annular plate, an arc-shaped outer ring plate formed on the outer side of the base plate, one surface of the outer ring plate is flush with the base plate, four outwardly protruding positioning plates are evenly formed on the outer side of the outer ring plate, the positioning plate is flush with one side surface of the outer ring plate, through holes are opened in the positioning plates, two positioning rings are embedded in the two through holes with the same diameter, a positioning protrusion is formed on the positioning ring, the positioning protrusion is located on the flush plane of the outer ring plate and the base plate, and the other side of the positioning ring is flush with the positioning plate.

[0006] According to the above technical solution, the other two through holes on the same diameter are embedded with embedded rings, and the two end faces of the embedded rings are also flush with the two ends of the positioning plate.

[0007] According to the above technical solution, the adjacent positioning plates are distributed at 90 degrees, and the four positioning plates are symmetrically arranged on the outer ring plate.

[0008] According to the above technical solution, an outer plate is formed on the outer edge of the bottom plate, a circular hole is opened in the center of the bottom plate, an inner plate is formed on the edge of the circular hole, a PCBA board is installed between the outer plate and the inner plate, the PCBA board is located on the bottom plate, and a sealing layer is also provided between the outer plate and the inner plate. The sealing layer seals the PCBA board in the shell, completely sealing the eddy current sensor.

[0009] According to the above technical solution, a wire harness mounting block is also provided in the shell, and a wire harness is plugged into the wire harness mounting block. The wire harness mounting block is located on one end of the connecting plate. The wire harness mounting block fixes the wire harness on the PCBA board so that the wire harness is connected to the PCBA board.

[0010] According to the above technical solution, a plurality of waist holes are evenly opened on the end of the outer plate, and the waist holes are opened above one end of the connecting plate. The waist holes are used to position the wire harness so that the guides in the wire harness are distributed at intervals and the distance between adjacent wires is maintained.

[0011] According to the above technical solution, the thickness of the positioning plate is greater than that of the outer ring plate. By increasing the thickness of the positioning plate, the rigidity and strength of the positioning plate are improved, ensuring the connection strength between the eddy current sensor and the motor housing.

[0012] According to the above technical solution, ribs are formed on the surface of the outer ring plate and the positioning plate, and the ribs are on the same side as the outer plate. The ribs are used to enhance the strength and rigidity of the outer ring plate and the positioning plate, thereby ensuring the rigidity of the eddy current sensor and reducing the thickness of the outer ring plate and the positioning plate, thereby reducing costs.

[0013] Compared with the prior art, the beneficial effect achieved by the present invention is: by setting a positioning ring on the positioning plate and using the positioning protrusion on the positioning ring to position the installation position of the eddy current sensor on the motor housing, the installation positioning accuracy and installation efficiency of the eddy current sensor are improved, and the detection accuracy of the rotor position of the eddy current sensor is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a three-dimensional diagram of the back side of the overall structure of the utility model;

[0016] Figure 2 It is a front perspective view of the overall structure of the utility model;

[0017] Figure 3 It is an exploded view of the overall structure of the utility model;

[0018] In the figure: 1. Shell; 11. Outer ring plate; 12. Outer plate; 13. Inner plate; 14. Bottom plate; 141. Ring plate; 142. Connecting plate; 15. Waist hole; 2. Positioning plate; 3. Positioning ring; 31. Positioning protrusion; 4. Embedded ring; 5. Wiring harness; 6. Sealing layer; 7. Wiring harness mounting block; 8. PCBA board. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Example

[0021] See also Figures 1 to 3 The utility model provides a technical solution: an eddy current sensor, comprising a shell 1, the shell 1 comprises a bottom plate 14, the bottom plate 14 comprises an annular plate 141 and a connecting plate 142 formed at one end of the annular plate 141, an outer plate 12 is formed on the outer edge of the bottom plate 14, a circular hole is opened in the center of the bottom plate 14, an inner plate 13 is formed on the edge of the circular hole, a PCBA board 8 is installed between the outer plate 12 and the inner plate 13, the PCBA board 8 is located on the bottom plate 14, a sealing layer 6 is further provided between the outer plate 12 and the inner plate 13, the sealing layer 6 seals the PCBA board 8 in the shell 1, an arc-shaped outer ring plate 11 is formed on the outer side of the bottom plate 14, the back side of the outer ring plate 11 is flush with the back side of the bottom plate 14, and four convex outer sides of the outer ring plate 11 are evenly formed. The positioning plate 2 has a back surface that is flush with the back surface of the outer ring plate 11. Through holes are provided in the positioning plate 2. Two through holes on the same diameter of the bottom plate 14 are embedded with positioning rings 3. Positioning protrusions 31 are formed on the positioning rings 3. The positioning protrusions 31 are located on the same plane as the outer ring plate 11 and the bottom plate 14, that is, on the back surface of the shell 1. The positioning protrusions 31 have the same height. The other side of the positioning ring 3 is flush with the positioning plate 2. By forming positioning protrusions 31 of the same height, the eddy current sensor can be quickly positioned by using the positioning protrusions 31 when it is installed on the motor housing, thereby ensuring the installation distance between the eddy current sensor and the motor housing, improving the installation positioning accuracy and installation efficiency of the eddy current sensor, and further improving the detection accuracy of the eddy current sensor.

[0022] The other two through holes with the same diameter are embedded with embedded rings 4, and the two end faces of the embedded rings 4 are also flush with the two ends of the positioning plate 2. Fasteners pass through the embedded rings 4 to install the eddy current sensor in the motor housing.

[0023] Adjacent positioning plates 2 are distributed at 90 degrees, and the four positioning plates 2 are symmetrically arranged on the outer ring plate 11. The embedded rings 4 are diagonally distributed, and the positioning rings 3 are also diagonally distributed, so that the eddy current sensor is installed in a diagonal positioning, which improves the accuracy of the positioning and installation of the eddy current sensor.

[0024] A wiring harness mounting block 7 is also provided in the housing 1. The wiring harness 5 is plugged into the wiring harness mounting block 7. The wiring harness mounting block 7 is located on one end of the connecting plate 142. The wiring harness mounting block 7 fixes the wiring harness 5 on the PCBA board 8 so that the wiring harness 5 is conductive with the PCBA board 8. The wiring harness mounting block 7 is used to fix the wiring harness 5 so that the wiring harness 5 is installed according to certain rules to transmit information signals or operation signals.

[0025] like Figure 3 As shown, a plurality of waist holes 15 are evenly provided on the end of the outer plate 12. The waist holes 15 are provided above one end of the connecting plate 142. The waist holes 15 are used to position the wiring harness 5 so that the wiring harness 5 can be distributed at a certain interval, thereby ensuring the spacing between the wires in the wiring harness 5.

[0026] like Figure 2 As shown, the thickness of the positioning plate 2 is greater than the thickness of the outer ring plate 11, which enhances the rigidity and strength of the positioning plate 2 and ensures the connection strength between the eddy current sensor and the motor housing.

[0027] There are ribs formed on the surface of the outer ring plate 11 and the positioning plate 2. The ribs are on the same side as the outer plate 12. By setting the ribs, the rigidity and strength of the eddy current sensor are further enhanced. The forming of the ribs forms grooves on the outer ring plate 11 and the positioning plate 2, reducing material usage and lowering costs.

[0028] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An eddy current sensor, comprising a housing, characterized in that: The shell includes a base plate, which includes an annular plate and a connecting plate formed at one end of the annular plate. An arc-shaped outer ring plate is formed on the outer side of the base plate, and one surface of the outer ring plate is flush with the base plate. Four outward-convex positioning plates are evenly formed on the outer side of the outer ring plate, and the positioning plate is flush with one side of the outer ring plate. Through holes are provided in the positioning plates, and two positioning rings are embedded in the two through holes with the same diameter. A positioning protrusion is formed on the positioning ring, and the positioning protrusion is located on the flush plane of the outer ring plate and the base plate, and the other side of the positioning ring is flush with the positioning plate.

2. The eddy current sensor according to claim 1, wherein: The other two through holes with the same diameter are embedded with embedded rings, and both end surfaces of the embedded rings are also flush with the two ends of the positioning plate.

3. The eddy current sensor according to claim 1, wherein: The adjacent positioning plates are distributed at 90 degrees, and the four positioning plates are symmetrically arranged on the outer ring plate.

4. The eddy current sensor according to claim 1, wherein: An outer plate is formed on the outer edge of the bottom plate, a circular hole is opened in the center of the bottom plate, an inner plate is formed on the edge of the circular hole, a PCBA board is installed between the outer plate and the inner plate, the PCBA board is located on the bottom plate, and a sealing layer is further provided between the outer plate and the inner plate, the sealing layer seals the PCBA board in the housing, 5. The eddy current sensor according to claim 1, wherein: A wiring harness mounting block is also provided in the housing, in which a wiring harness is plugged. The wiring harness mounting block is located on one end of the connecting plate. The wiring harness mounting block fixes the wiring harness on the PCBA board so that the wiring harness is connected to the PCBA board.

6. The eddy current sensor according to claim 1, wherein: A plurality of waist holes are evenly provided on the end of the outer plate, and the waist holes are provided above one end of the connecting plate, and the waist holes are used for positioning the wire harness.

7. The eddy current sensor according to claim 1, wherein: The thickness of the positioning plate is greater than the thickness of the outer ring plate.

8. The eddy current sensor according to claim 1, wherein: Ribs are formed on the surfaces of the outer ring plate and the positioning plate, and the ribs are on the same side as the outer plate.

Images