Assembled eddy current sensor target wheel structure and installation method thereof

Abstract

The present invention relates to the technical field of permanent magnet synchronous motor sensors, and specifically to an assembled eddy current sensor target wheel structure and an installation method thereof. The assembled eddy current sensor target wheel structure of the present invention integrates the function of a motor rotor bracket. Through the reasonable arrangement of the rotor core mounting surface, the shaft mounting inner hole, the eddy current sensing surface, the target wheel cylindrical base, the dynamic balance adjustment surface and the bearing mounting shaft, it is easy to install and has high reliability. It can effectively improve the assembly efficiency of the motor rotor, ensure the accuracy of the motor rotor position detection result, and does not require the special installation of a separate target wheel part, which can reduce the overall installation cost of the motor; the present invention opens a cooling oil port and a corresponding cooling oil circuit in a preset area in the assembled eddy current sensor target wheel structure, which can effectively ensure the cooling effect of the motor rotor after the target wheel and the motor rotor structure are assembled, and improve the service life of the motor rotor.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet synchronous motor sensors, and in particular to an assembled eddy current sensor target wheel structure and a mounting method thereof. Background Art

[0002] Permanent magnet synchronous motors use permanent magnets to provide excitation, eliminating the collector rings and brushes that are prone to problems, making the motor structure simpler and improving the reliability of motor operation; and because no excitation current is required, there is no excitation loss, which can improve the efficiency and power density of the motor. Permanent magnet synchronous motors are mainly composed of stators, rotors, and end covers. The motor rotor is mainly composed of a rotor core and a shaft, and permanent magnets are installed on the rotor core. The gearbox of a hybrid vehicle is usually also equipped with a rotor bracket.

[0003] Eddy current sensor technology is a non-contact detection technology that uses the principle of electromagnetic induction to transmit and receive induced AC signals with corresponding coils at the transmitting and receiving ends, and then calculates the position of the target wheel. The target wheel of the eddy current sensor is fixed on the motor shaft and rotates with the rotor. By detecting the position of the target wheel, the relative position of the motor rotor and stator can be calculated; currently, eddy current sensors are widely used in permanent magnet synchronous motor rotor position detection.

[0004] The target wheel of the eddy current sensor in the prior art is usually a separate part. When detecting the rotor position of a permanent magnet synchronous motor, it needs to be installed separately on the motor shaft using specific tooling. The operation is cumbersome and the target wheel is easily damaged. After the motor has been running for a long time, the installation position of the target wheel in the prior art is prone to deviation, resulting in reduced accuracy in detecting the motor rotor position. At the same time, the motor rotor assembly scheme in the prior art has low assembly efficiency, and the motor rotor bracket is usually a solid structure with poor heat dissipation performance, which easily affects the service life of the rotor structure. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in view of the shortcomings of the prior art, an assembled eddy current sensor target wheel structure and an installation method thereof are provided, which have a compact structure, are easy to install, and have high reliability. They can effectively improve the assembly efficiency of the motor rotor, reduce the overall installation cost of the motor, and enhance the cooling effect of the motor rotor, thereby ensuring the accuracy of rotor position detection.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] 1. An assembled eddy current sensor target wheel structure

[0008] The present invention provides an assembled eddy current sensor target wheel structure, which mainly includes: a rotor core mounting surface 1, a shaft mounting inner hole 2, an eddy current sensing surface 3, a target wheel cylindrical base 4, a dynamic balance adjustment surface 5, and a bearing mounting shaft 6;

[0009] Among them, the front and rear parts of the outer ring of the target wheel cylindrical base 4 are respectively provided with a dynamic balancing adjustment surface 5 and a rotor core mounting surface 1, the middle part of the inner ring of the target wheel cylindrical base 4 is provided with a bearing mounting shaft 6, the middle part of the bearing mounting shaft 6 is axially opened with a rotating shaft mounting inner hole 2, and the front end part of the dynamic balancing adjustment surface 5 is provided with an eddy current induction surface 3.

[0010] Furthermore, the outer diameter of the rotor core mounting surface 1 is adapted to the inner diameter of the motor rotor core 11, and the outer diameter of the dynamic balancing adjustment surface 5 is larger than the outer diameter of the rotor core mounting surface 1, so that a core mounting stop end surface 7 is formed between the dynamic balancing adjustment surface 5 and the rotor core mounting surface 1, and the core mounting stop end surface 7 is abutted against the front end surface of the motor rotor core 11.

[0011] Furthermore, the eddy current sensing surface 3 is composed of a plurality of evenly distributed and cocentric sector-shaped convex surfaces, each sector-shaped convex surface is the same in size and shape and is compatible with the eddy current sensor assembly, and the sector-shaped convex surface is axially higher than the end face of the cylindrical base 4 of the target wheel by 1 to 10 mm.

[0012] Furthermore, the inner diameter of the shaft mounting inner hole 2 is adapted to the outer diameter of the motor shaft 12, the outer diameter of the bearing mounting shaft 6 is adapted to the motor bearing, and the rear end face of the bearing mounting shaft 6 located in the inner cavity of the target wheel cylindrical base 4 abuts against the motor shaft shoulder 13.

[0013] Furthermore, a plurality of oil inlet holes 10 are evenly formed on the inner wall of the shaft mounting inner hole 2, and the positions of the oil inlet holes 10 correspond to the shaft oil holes formed on the outer wall of the motor shaft 12. A plurality of main oil outlets 8 corresponding to the oil inlet holes 10 are evenly formed on the outer wall of the dynamic balancing adjustment surface 5, and each oil inlet hole 10 is connected to the corresponding main oil outlet 8 through the cooling oil main oil circuit 15.

[0014] Furthermore, the cooling oil main oil circuit 15 is evenly provided with a plurality of cooling oil main oil circuits 15 along the radial direction of the target wheel cylindrical base 4, and each cooling oil main oil circuit 15 is connected to the branch oil outlet 9 provided on the core mounting stop end face 7 through the corresponding cooling oil branch oil circuit 16;

[0015] The cooling oil branch oil passages 16 are all arranged along the axial direction, and the branch oil outlets 9 are aligned with the core oil holes opened on the front end surface of the motor rotor core 11 .

[0016] Furthermore, the outer ring of the dynamic balance adjustment surface 5 is provided with a plurality of adjustment holes for adjusting the overall dynamic balance of the target wheel.

[0017] Furthermore, the target wheel cylindrical base 4, the dynamic balance adjustment surface 5 and the rotor core mounting surface 1 are all made of alloy steel material and are all hollow structures.

[0018] 2. A method for installing a target wheel structure of an assembled eddy current sensor

[0019] Based on the same inventive concept, the present invention also provides a method for installing the above-mentioned assembled eddy current sensor target wheel structure, which mainly includes the following steps:

[0020] S1, rotor core installation and core oil hole docking: first, insert the motor rotor core into the rotor core installation surface, and make the front end surface of the rotor core butt against the end surface of the core installation stopper, then rotate the rotor core circumferentially to align the core oil hole with the corresponding branch oil outlet on the stopper end surface;

[0021] S2, target wheel dynamic balance adjustment: by opening adjustment holes on the dynamic balance adjustment surface, the dynamic balance parameters of the target wheel structure as a whole meet the preset values;

[0022] S3, motor bearing installation: insert the motor bearing into the bearing installation shaft, and make the axial end face of the bearing abut against the front end face of the cylindrical base of the target wheel;

[0023] S4, motor shaft installation and shaft oil hole docking: firstly, the motor shaft is inserted into the target wheel structure along the shaft installation inner hole, so that the motor shaft shoulder and the rear end surface of the bearing installation shaft located in the inner cavity of the target wheel cylindrical base are butted against each other, and then the motor shaft is rotated in the circumferential direction so that the shaft oil hole is aligned with the oil inlet hole on the inner wall of the shaft installation inner hole;

[0024] S5, motor housing assembly: integrally install the target wheel structure into the motor housing, snap the motor bearing into the bearing chamber of the housing, and align the eddy current sensing surface with the eddy current sensor assembly.

[0025] 3. A permanent magnet synchronous motor

[0026] Based on the same inventive concept, the present invention also provides a permanent magnet synchronous motor, which includes the assembled eddy current sensor target wheel structure as described above.

[0027] Compared with the prior art, the present invention has the following main advantages:

[0028] 1. The assembled eddy current sensor target wheel structure of the present invention is integrated with the motor rotor bracket function. Through the reasonable arrangement of the rotor core mounting surface, the shaft mounting inner hole, the eddy current sensing surface, the target wheel cylindrical base, the dynamic balance adjustment surface and the bearing mounting shaft, the target wheel and the motor rotor bracket are designed as one piece, so that the target wheel is installed in place synchronously with the motor rotor bracket, and there is no need to carry out special installation of separate target wheel parts. It is easy to install and has high reliability. It can effectively improve the assembly efficiency of the motor rotor, ensure the accuracy of the motor rotor position detection result, and reduce the overall installation cost of the motor.

[0029] 2. The present invention opens a cooling oil port and a corresponding cooling oil circuit in a preset area in the target wheel structure of the assembled eddy current sensor, which can effectively ensure the cooling effect of the motor rotor and improve the service life of the motor rotor after the target wheel and the motor rotor structure are assembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is an overall schematic diagram of the target wheel structure of the assembled eddy current sensor in an embodiment of the present invention;

[0031] Figure 2 is a cross-sectional view of a target wheel cooling oil circuit structure in an embodiment of the present invention;

[0032] Figure 3 It is an overall cross-sectional view of the target wheel structure and the motor rotor after being assembled in the embodiment of the present invention;

[0033] Figure 4 The figure is a flow chart of the installation method in an embodiment of the present invention.

[0034] In the figure: 1. Rotor core mounting surface; 2. Shaft mounting inner hole; 3. Eddy current sensing surface; 4. Target wheel cylindrical base; 5. Dynamic balancing adjustment surface; 6. Bearing mounting shaft; 7. Core mounting stop end face; 8. Main oil outlet; 9. Branch oil outlet; 10. Oil inlet; 11. Motor rotor core; 12. Motor shaft; 13. Motor shaft shoulder; 14. Motor housing; 15. Cooling oil main oil circuit; 16. Cooling oil branch oil circuit. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0037] Embodiment 1: This embodiment provides a target wheel structure of an assembled eddy current sensor, such as Figures 1 to 3 As shown, it mainly includes: a rotor core mounting surface 1, a shaft mounting inner hole 2, an eddy current sensing surface 3, a target wheel cylindrical base 4, a dynamic balance adjustment surface 5, and a bearing mounting shaft 6;

[0038] Among them, the front and rear parts of the outer ring of the target wheel cylindrical base 4 are respectively provided with a dynamic balancing adjustment surface 5 and a rotor core mounting surface 1, the middle part of the inner ring of the target wheel cylindrical base 4 is provided with a bearing mounting shaft 6, the middle part of the bearing mounting shaft 6 is axially opened with a rotating shaft mounting inner hole 2, and the front end part of the dynamic balancing adjustment surface 5 is provided with an eddy current induction surface 3.

[0039] Furthermore, the outer diameter of the rotor core mounting surface 1 is adapted to the inner diameter of the motor rotor core 11, and the outer diameter of the dynamic balancing adjustment surface 5 is larger than the outer diameter of the rotor core mounting surface 1, so that a core mounting stop end surface 7 is formed between the dynamic balancing adjustment surface 5 and the rotor core mounting surface 1, and the core mounting stop end surface 7 is abutted against the front end surface of the motor rotor core 11.

[0040] Furthermore, the eddy current sensing surface 3 is composed of a plurality of evenly distributed and cocentric sector-shaped convex surfaces, each sector-shaped convex surface is the same in size and shape and is compatible with the eddy current sensor assembly, and the sector-shaped convex surface is axially higher than the end face of the cylindrical base 4 of the target wheel by 1 to 10 mm.

[0041] Furthermore, the inner diameter of the shaft mounting inner hole 2 is adapted to the outer diameter of the motor shaft 12, the outer diameter of the bearing mounting shaft 6 is adapted to the motor bearing, and the rear end face of the bearing mounting shaft 6 located in the inner cavity of the target wheel cylindrical base 4 abuts against the motor shaft shoulder 13.

[0042] Furthermore, a plurality of oil inlet holes 10 are evenly formed on the inner wall of the shaft mounting inner hole 2, and the positions of the oil inlet holes 10 correspond to the shaft oil holes formed on the outer wall of the motor shaft 12. A plurality of main oil outlets 8 corresponding to the oil inlet holes 10 are evenly formed on the outer wall of the dynamic balancing adjustment surface 5, and each oil inlet hole 10 is connected to the corresponding main oil outlet 8 through the cooling oil main oil circuit 15.

[0043] Furthermore, the cooling oil main oil circuit 15 is evenly provided with a plurality of cooling oil main oil circuits 15 along the radial direction of the target wheel cylindrical base 4, and each cooling oil main oil circuit 15 is connected to the branch oil outlet 9 provided on the core mounting stop end face 7 through the corresponding cooling oil branch oil circuit 16;

[0044] The cooling oil branch oil passages 16 are all arranged along the axial direction, and the branch oil outlets 9 are aligned with the core oil holes opened on the front end surface of the motor rotor core 11 .

[0045] Furthermore, the outer ring of the dynamic balance adjustment surface 5 is provided with a plurality of adjustment holes for adjusting the overall dynamic balance of the target wheel.

[0046] Furthermore, the target wheel cylindrical base 4, the dynamic balance adjustment surface 5 and the rotor core mounting surface 1 are all made of alloy steel material and are all hollow structures.

[0047] Embodiment 2: This embodiment provides an assembled eddy current sensor target wheel structure, which can make the target wheel and the motor rotor bracket into an integrated design. The target wheel is automatically formed when the motor rotor bracket is installed, and there is no need to carry out special installation of the target wheel parts separately. The structure contains a cooling oil port and a corresponding cooling oil circuit, and has the characteristics of simple structure, easy installation, low cost, good cooling effect, high reliability, etc.

[0048] The assembled eddy current sensor target wheel structure includes a rotor core mounting surface 1, a shaft mounting inner hole 2, an eddy current sensing surface 3, a target wheel cylindrical base 4, a dynamic balancing adjustment surface 5, and a bearing mounting shaft 6. In addition, the rotor core mounting surface and the eddy current sensing surface also contain some through holes for cooling oil to pass through.

[0049] Some areas adopt a hollow structure for installing other parts. The eddy current sensing surface 3 is composed of a plurality of evenly distributed and co-centered sector-shaped convex surfaces, each of which has the same size and shape, and is 1 to 10 mm higher than the base below; the heights of the inner diameter edge and the outer diameter edge of the sector to the base may be different, and the inner diameter boundary and the outer diameter boundary may be arc lines, straight lines or other irregular lines.

[0050] A circle of oil holes is provided in the inner hole of the target wheel, which is opened from the inner ring to the outer diameter, and a branch is separated at the outer diameter to align with the oil hole of the rotor core. When the motor is working, the cooling oil enters the oil inlet of the inner ring from the inner hole of the shaft due to the centrifugal force of the high-speed rotation of the rotor, and moves radially along the oil inlet to the outer ring of the target wheel. At this time, part of the cooling oil is radially thrown out to the end of the stator for cooling, and the other part moves axially to the oil hole of the inner diameter of the rotor core to cool the rotor.

[0051] When installing:

[0052] First, install the rotor core to the rotor core mounting surface 1, axially reach the stop, and circumferentially align the rotor core oil hole with the oil outlet of the rotor core mounting surface 1 to facilitate the outflow of cooling oil;

[0053] Then the target wheel is subjected to dynamic balancing test, and holes are punched on the dynamic balancing adjustment surface 5 so that the dynamic balancing meets the use requirements;

[0054] Then install the bearing to the bearing installation shaft 6 of the target wheel so that the axial end surface of the bearing is close to the target wheel;

[0055] Then install the shaft into the target wheel along the shaft installation inner hole 2, so that the motor shaft shoulder is close to the end face of the target wheel, and the oil hole on the shaft is aligned with the oil inlet hole of the target wheel to facilitate the outflow of cooling oil;

[0056] Finally, the target wheel assembly is installed as a whole into the motor housing, and the bearing is installed in the bearing chamber of the housing. At this time, the eddy current sensor assembly has been installed in the housing in advance, and the eddy current sensing surface 3 is automatically aligned with the eddy current sensor assembly, thus completing the installation of the motor rotor assembly and the eddy current sensor.

[0057] Furthermore, oil holes are also provided on the eddy current induction surface 3 of the target wheel and the cylindrical base 4 of the target wheel.

[0058] Furthermore, the target wheel is made of alloy steel material.

[0059] Embodiment 3, based on the same inventive concept, this embodiment also provides a method for installing the target wheel structure of the assembled eddy current sensor as described above, such as Figure 4 As shown, it mainly includes the following steps:

[0060] S1, rotor core installation and core oil hole docking: first, insert the motor rotor core into the rotor core installation surface, and make the front end surface of the rotor core butt against the end surface of the core installation stopper, then rotate the rotor core circumferentially to align the core oil hole with the corresponding branch oil outlet on the stopper end surface;

[0061] S2, target wheel dynamic balance adjustment: by opening adjustment holes on the dynamic balance adjustment surface, the dynamic balance parameters of the target wheel structure as a whole meet the preset values;

[0062] S3, motor bearing installation: insert the motor bearing into the bearing installation shaft, and make the axial end face of the bearing abut against the front end face of the cylindrical base of the target wheel;

[0063] S4, motor shaft installation and shaft oil hole docking: firstly, the motor shaft is inserted into the target wheel structure along the shaft installation inner hole, so that the motor shaft shoulder and the rear end surface of the bearing installation shaft located in the inner cavity of the target wheel cylindrical base are butted against each other, and then the motor shaft is rotated in the circumferential direction so that the shaft oil hole is aligned with the oil inlet hole on the inner wall of the shaft installation inner hole;

[0064] S5, motor housing assembly: the target wheel structure is installed as a whole into the motor housing, the motor bearing is snapped into the bearing chamber of the housing, and the eddy current sensing surface is aligned with the eddy current sensor assembly.

[0065] Embodiment 4: Based on the same inventive concept, this embodiment further provides a permanent magnet synchronous motor, which includes the assembled eddy current sensor target wheel structure as described above.

[0066] Furthermore, all parts involved in this application that are not described in detail are the same as the prior art or are implemented using the prior art.

[0067] In summary:

[0068] 1. The assembled eddy current sensor target wheel structure of the present invention is integrated with the motor rotor bracket function. Through the reasonable arrangement of the rotor core mounting surface, the shaft mounting inner hole, the eddy current sensing surface, the target wheel cylindrical base, the dynamic balance adjustment surface and the bearing mounting shaft, the target wheel and the motor rotor bracket are designed as one piece, so that the target wheel is installed in place synchronously with the motor rotor bracket, and there is no need to carry out special installation of separate target wheel parts. It is easy to install and has high reliability. It can effectively improve the assembly efficiency of the motor rotor, ensure the accuracy of the motor rotor position detection result, and reduce the overall installation cost of the motor.

[0069] 2. The present invention opens a cooling oil port and a corresponding cooling oil circuit in a preset area in the target wheel structure of the assembled eddy current sensor, which can effectively ensure the cooling effect of the motor rotor and improve the service life of the motor rotor after the target wheel and the motor rotor structure are assembled.

[0070] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An assembled eddy current sensor target wheel structure, characterized in that: It comprises a target wheel cylindrical base (4), wherein the front and rear portions of the outer ring of the target wheel cylindrical base (4) are respectively provided with a dynamic balancing adjustment surface (5) and a rotor core mounting surface (1), the middle portion of the inner ring of the target wheel cylindrical base (4) is provided with a bearing mounting shaft (6), the middle portion of the bearing mounting shaft (6) is provided with a rotating shaft mounting inner hole (2) along the axial direction, and the front end portion of the dynamic balancing adjustment surface (5) is provided with an eddy current sensing surface (3); The inner wall of the shaft mounting inner hole (2) is evenly provided with a plurality of oil inlet holes (10), the positions of the oil inlet holes (10) correspond to the shaft oil holes formed on the outer wall of the motor shaft (12), the outer wall of the dynamic balancing adjustment surface (5) is evenly provided with a plurality of main oil outlets (8) corresponding to the oil inlet holes (10), and each oil inlet hole (10) is connected to the corresponding main oil outlet (8) through a cooling oil main oil path (15); The outer diameter of the rotor core mounting surface (1) is matched to the inner diameter of the motor rotor core (11), and the outer diameter of the dynamic balancing adjustment surface (5) is larger than the outer diameter of the rotor core mounting surface (1), so that an iron core mounting stop end surface (7) is formed between the dynamic balancing adjustment surface (5) and the rotor core mounting surface (1), and the iron core mounting stop end surface (7) abuts against the front end surface of the motor rotor core (11); A plurality of cooling oil main oil passages (15) are evenly arranged along the radial direction of the target wheel cylindrical base (4), and each cooling oil main oil passage (15) is connected to a branch oil outlet (9) provided on the core mounting stop end surface (7) via a corresponding cooling oil branch oil passage (16); The cooling oil branch oil paths (16) are all arranged along the axial direction, and the branch oil outlets (9) are aligned with the iron core oil holes opened on the front end surface of the motor rotor iron core (11).

2. The assembled eddy current sensor target wheel structure according to claim 1, characterized in that: The eddy current sensing surface (3) is composed of a plurality of evenly distributed and co-centric sector-shaped convex surfaces, each sector-shaped convex surface is identical in size and shape and is compatible with the eddy current sensor assembly, and the sector-shaped convex surface is 1 to 10 mm higher than the end surface of the target wheel cylindrical base (4) in the axial direction.

3. The assembled eddy current sensor target wheel structure according to claim 1, characterized in that: The inner diameter of the shaft mounting inner hole (2) is matched with the outer diameter of the motor shaft (12), the outer diameter of the bearing mounting shaft (6) is matched with the motor bearing, and the rear end surface of the bearing mounting shaft (6) located in the inner cavity of the target wheel cylindrical base (4) abuts against the motor shaft shoulder (13).

4. The assembled eddy current sensor target wheel structure according to claim 1, characterized in that: The outer ring of the dynamic balance adjustment surface (5) is provided with a plurality of adjustment holes for adjusting the overall dynamic balance of the target wheel.

5. The assembled eddy current sensor target wheel structure according to claim 1, characterized in that: The target wheel cylindrical base (4), the dynamic balance adjustment surface (5) and the rotor core mounting surface (1) are all made of alloy steel material and are all hollow structures.

6. A method for installing the assembled eddy current sensor target wheel structure as claimed in any one of claims 1 to 5, characterized in that: The steps include: S1, rotor core installation and core oil hole docking: first, insert the motor rotor core into the rotor core installation surface, and make the front end surface of the rotor core butt against the end surface of the core installation stopper, then rotate the rotor core circumferentially to align the core oil hole with the corresponding branch oil outlet on the stopper end surface; S2, target wheel dynamic balance adjustment: by opening adjustment holes on the dynamic balance adjustment surface, the dynamic balance parameters of the target wheel structure as a whole meet the preset values; S3, motor bearing installation: insert the motor bearing into the bearing installation shaft, and make the axial end face of the bearing abut against the front end face of the cylindrical base of the target wheel; S4, motor shaft installation and shaft oil hole docking: firstly, the motor shaft is inserted into the target wheel structure along the shaft installation inner hole, so that the motor shaft shoulder and the rear end surface of the bearing installation shaft located in the inner cavity of the target wheel cylindrical base are butted against each other, and then the motor shaft is rotated in the circumferential direction so that the shaft oil hole is aligned with the oil inlet hole on the inner wall of the shaft installation inner hole; S5, motor housing assembly: integrally install the target wheel structure into the motor housing, snap the motor bearing into the bearing chamber of the housing, and align the eddy current sensing surface with the eddy current sensor assembly.

7. A permanent magnet synchronous motor, characterized in that: It comprises the assembled eddy current sensor target wheel structure as claimed in any one of claims 1 to 5.

Images