Automobile motor electric eddy current angle position sensor

Abstract

The utility model discloses an automobile motor electric eddy current angle position sensor in the field of sensor angle position detection, which comprises a shell, a through hole is arranged on the shell, a plurality of support legs are arranged on the periphery of the shell, a circuit board is arranged in the shell, a mounting hole is arranged on the circuit board, and the mounting hole corresponds to the through hole. The circuit board is connected with the wire harness assembly, and an epoxy resin layer is arranged on the shell and located above the circuit board in a covering mode. According to the utility model, the rectangular flat pad is adopted, thereby increasing the soldering contact area and improving the product connection stability; a shell insert is not used, and the wire harness clamp and the shell are in interference fit, so that the risk of oil leakage when the wire harness clamp is used in an oil cooling environment is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of sensor angular position detection, and particularly relates to an eddy current angular position sensor for an automotive motor. Background Art

[0002] In the prior art, a sensor for measuring the eddy current angular position of a motor generally uses a circuit board welded on an inserted pin in a housing. The transmitting coil (Tx) on the circuit board and a capacitor in the circuit together form an LC oscillator circuit. The LC oscillator generates magnetic fields with different intensities around the winding of the transmitting coil, and through mutual inductance, it is coupled to two receiving coils of sine and cosine. When a conductive target (rotor) passes through the coil, eddy currents will be formed on the surface of the conductor. As the angle of the target position (rotor) changes, this causes changes in the sine and cosine induced voltages. The generated sine and cosine voltages are related to the only electrical angle that can be obtained, so as to calculate the angular position. The problems of the current sensor are as follows: it is easy to occur soldering voids and solder joint detachment, and the connection stability of the product is poor; there is a risk of oil leakage when the housing is used in an oil-cooled environment. Content of the Utility Model

[0003] The purpose of the utility model is to provide an eddy current angular position sensor for an automotive motor, which adopts a rectangular flat pad to increase the solder contact area and improve the connection stability of the product; does not use a housing insert, and uses a wire harness clip to perform interference fit with the housing to avoid the risk of oil leakage when used in an oil-cooled environment.

[0004] The purpose of the utility model is realized as follows: an eddy current angular position sensor for an automotive motor, including a housing, a through hole is provided on the housing, several feet are arranged on the periphery of the housing, a circuit board is arranged inside the housing, an installation hole is provided on the circuit board, and the installation hole corresponds to the through hole. The circuit board is connected to a wire harness assembly, and an epoxy resin layer is covered above the circuit board on the housing.

[0005] A coil is provided on the circuit board of the utility model on the outer periphery of the installation hole. During operation, when a conductive target (rotor) passes through the through hole, eddy currents will be formed on the surface of the conductor. As the angle of the target position (rotor) changes, this causes changes in the sine and cosine induced voltages. The generated sine and cosine voltages are related to the only electrical angle that can be obtained, so as to measure the eddy current angular position of the motor. Compared with the prior art, the beneficial effects of the utility model are as follows: replacing the through hole pad on the circuit board with a rectangular flat pad can increase the solder contact area between the wire harness and the circuit board, reduce the incidence of soldering voids and solder joint detachment, and improve the connection stability of the product; does not use a housing insert, uses a wire harness clip to perform interference fit with the housing, and the wire harness clip fixes the wire harness to reduce the risk of oil leakage when used in an oil-cooled environment.

[0006] As a further improvement of the present utility model, the housing includes a bottom plate, an outer side plate extending upward is provided on the outer periphery of the bottom plate, an embedding groove is opened on one side of the outer side plate close to the wire harness assembly, and the depth of the embedding groove is less than the height of the outer side plate.

[0007] As a further improvement of the present utility model, the circuit board is arranged on the bottom plate, the outer side plate is arranged corresponding to the outer periphery of the circuit board, several positioning posts are vertically arranged on the bottom plate, several positioning holes are opened on the circuit board corresponding to each positioning post, and each positioning post respectively passes through the corresponding positioning hole and is thermally riveted and fixed to the circuit board. The circuit board is thermally riveted and fixed to the housing.

[0008] As a further improvement of the present utility model, the perforation is opened on the bottom plate, a positioning cylinder is vertically arranged on the housing at the periphery of the perforation, and the positioning cylinder cooperates to pass through the mounting hole of the circuit board. The positioning cylinder positions and installs the circuit board.

[0009] As a further improvement of the present utility model, the front ends of the wire harnesses of the wire harness assembly are fixed by wire harness clips, the wire harness clips are cooperatively installed in the embedding groove, a clamping block embedded in the outer side plate is provided on each of the left and right sides of the wire harness clip, and the front ends of the wire harnesses of the wire harness assembly are soldered and fixed to the circuit board. The wire harness clips fix the wire harnesses.

[0010] As a further improvement of the present utility model, the epoxy resin layer is arranged corresponding to the inner wall of the outer side plate of the housing, the epoxy resin layer covers the wire harnesses passing through the wire harness clip, and the positioning cylinder passes through the epoxy resin layer. The epoxy resin layer serves as an adhesive layer to fix the circuit board.

[0011] As a further improvement of the present utility model, a bushing is provided on the inner wall of the mounting inner hole of the support leg. The sensor is installed on the motor through the support leg for eddy current angle position detection. Description of the Drawings

[0012] Figure 1 It is a structural schematic diagram of the present utility model.

[0013] Figure 2 It is an enlarged view of the housing and the circuit board.

[0014] Figure 3 It is an enlarged view of the housing.

[0015] Wherein, 1 is the housing, 1a is the bottom plate, 1b is the outer side plate, 2 is the perforation, 3 is the support leg, 4 is the circuit board, 5 is the wire harness assembly, 5a is the wire harness, 6 is the epoxy resin layer, 7 is the embedding groove, 8 is the positioning post, 9 is the positioning cylinder, 10 is the wire harness clip, 11 is the clamping block, 12 is the bushing. Detailed Embodiment

[0016] Such as Figures 1-3As shown in the figure, it is an eddy current angle position sensor for an automotive motor, including a housing 1. A perforation 2 is provided on the housing 1. A number of feet 3 are arranged on the periphery of the housing 1, and a bushing 12 is provided on the inner wall of the mounting inner hole of the feet 3. A circuit board 4 is arranged inside the housing 1. Mounting holes are provided on the circuit board 4, and the mounting holes are arranged corresponding to the perforation 2. The circuit board 4 is connected to a wire harness assembly 5. An epoxy resin layer 6 is covered and arranged above the circuit board 4 on the housing 1.

[0017] The housing 1 includes a bottom plate 1a. An outer side plate 1b extending upward is arranged on the outer periphery of the bottom plate 1a. An embedding groove 7 is provided on the side of the outer side plate 1b close to the wire harness assembly 5, and the depth of the embedding groove 7 is less than the height of the outer side plate 1b. The circuit board 4 is arranged on the bottom plate 1a, and the outer side plate 1b is arranged corresponding to the outer periphery of the circuit board 4. A number of positioning columns 8 are vertically arranged on the bottom plate 1a. A number of positioning holes are provided on the circuit board 4 corresponding to each positioning column 8. Each positioning column 8 respectively passes through the corresponding positioning hole and is thermally riveted and fixed to the circuit board 4. The circuit board 4 is thermally riveted and fixed to the housing 1. The perforation 2 is provided on the bottom plate 1a. A positioning cylinder 9 is vertically arranged on the periphery of the perforation 2 on the housing 1, and the positioning cylinder 9 is fitted through the mounting hole of the circuit board 4. The positioning cylinder 9 positions the installation of the circuit board 4.

[0018] The front ends of the respective wire harnesses 5a of the wire harness assembly 5 are fixed by a wire harness clip 10. The wire harness clip 10 is fitted and installed in the embedding groove 7. A clamping block 11 embedded in the outer side plate 1b is provided on each of the left and right sides of the wire harness clip 10. The front ends of the respective wire harnesses 5a of the wire harness assembly 5 are soldered and fixed to the circuit board 4. The wire harness clip 10 fixes the respective wire harnesses 5a.

[0019] The outer periphery of the epoxy resin layer 6 is arranged corresponding to the inner wall of the outer side plate 1b of the housing 1. The epoxy resin layer 6 covers the respective wire harnesses passing through the wire harness clip 10, and the positioning cylinder 9 passes through the epoxy resin layer 6. The epoxy resin layer 6 serves as an adhesive layer to fix the circuit board 4.

[0020] A coil is provided on the circuit board 4 of the present utility model on the outer periphery of the mounting hole. During operation, when a conductive target (rotor) passes through the perforation 2, eddy currents will be formed on the surface of the conductor. As the angle of the target position (rotor) changes, this causes changes in the sine and cosine induced voltages. The generated sine and cosine voltages are related to a unique electrical angle that can be obtained, thereby measuring the eddy current angle position of the motor. The advantages of the present utility model are as follows: replacing the solder pads of the perforation 2 on the circuit board 4 with rectangular flat solder pads can increase the solder contact area between the wire harness and the circuit board 4, reduce the incidence of virtual soldering and desoldering, and improve the connection stability of the product; without using housing inserts, using the wire harness clip 10 for interference fit with the housing 1, the wire harness clip 10 fixes the wire harness, reducing the risk of oil leakage when used in an oil-cooled environment.

[0021] The present utility model is not limited to the above embodiments. Based on the technical solutions disclosed by the present utility model, those skilled in the art can make some substitutions and deformations to some of the technical features without creative labor according to the disclosed technical content, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. An eddy current angle position sensor for an automobile motor, comprising a housing, characterized in that: The shell is provided with a through hole, a plurality of legs are arranged on the periphery of the shell, a circuit board is arranged inside the shell, a mounting hole is provided on the circuit board, the mounting hole is arranged corresponding to the through hole, the circuit board is connected to the wiring harness assembly, and an epoxy resin layer is arranged on the shell above the circuit board.

2. The automotive motor eddy current angle position sensor according to claim 1, characterized in that: The housing comprises a bottom plate, an outer plate extending upward is arranged on the outer periphery of the bottom plate, an embedding groove is provided on a side of the outer plate close to the wiring harness assembly, and the depth of the embedding groove is less than the height of the outer plate.

3. The automotive motor eddy current angle position sensor according to claim 2, characterized in that: The circuit board is arranged on the bottom plate, and the outer plate is arranged corresponding to the outer periphery of the circuit board. There are several positioning columns vertically arranged on the bottom plate, and several positioning holes are opened on the circuit board corresponding to each positioning column. Each positioning column passes through the corresponding positioning hole and is fixed to the circuit board by hot riveting.

4. An automotive motor eddy current angle position sensor according to claim 2 or 3, characterized in that: The through hole is formed on the bottom plate, and a positioning cylinder is vertically arranged on the shell body at the periphery of the through hole, and the positioning cylinder cooperates with the mounting hole passing through the circuit board.

5. The automotive motor eddy current angle position sensor according to claim 4, characterized in that: The front ends of each wiring harness of the wiring harness assembly are fixed by a wiring harness clamp, and the wiring harness clamp is installed in the embedded groove. A clamping block embedded in the outer plate is provided on the left and right sides of the wiring harness clamp. The front ends of each wiring harness of the wiring harness assembly are fixed to the circuit board by soldering.

6. The automotive motor eddy current angle position sensor according to claim 5, characterized in that: The outer periphery of the epoxy resin layer is arranged corresponding to the inner wall of the outer plate of the shell, the epoxy resin layer covers each wire harness passing through the wire harness clamp, and the positioning tube is arranged through the epoxy resin layer.

7. An automotive motor eddy current angle position sensor according to any one of claims 1 to 3, characterized in that: A bushing is provided on the inner wall of the mounting inner hole of the support foot.

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