Sensing Device

Abstract

An embodiment of the present invention may provide a sensing device including a stator and a rotor including a magnet, the stator including first stator teeth, second stator teeth, and a collector disposed between the first stator teeth and the second stator teeth, the collector including a first collector and a second collector having a length different from that of the first collector.

Description

[Technical field]

[0001] The present invention relates to a sensing device. [Background technology]

[0002] The Electronic Power System (EPS) enables the driver to drive safely by driving a motor with an Electronic Control Unit according to driving conditions, ensuring cornering stability and providing quick restoring force.

[0003] The EPS includes a sensor assembly that measures the torque and steering angle of the steering shaft to provide an appropriate torque. The sensor assembly may include a torque sensor that measures the torque applied to the steering shaft and an index sensor that measures the angular acceleration of the steering shaft. The steering shaft may include an input shaft connected to a steering wheel, an output shaft connected to a power transmission structure on the wheel side, and a torsion bar that connects the input shaft and the output shaft.

[0004] The torque sensor measures the degree of twist of the torsion bar to measure the torque applied to the steering shaft, and the index sensor measures the angular acceleration of the steering shaft by sensing the rotation of the output shaft. In the sensor assembly, the torque sensor and the index sensor may be disposed together and integrally configured.

[0005] The torque sensor can measure the torque by including a housing, a rotor, a stator including stator teeth, and a collector.

[0006] In this case, the torque sensor may be provided as a magnetic type structure in which the collector is disposed outside the stator teeth.

[0007] However, when an external magnetic field is generated, the collector in this structure acts as a path for the external magnetic field, which affects the magnetic flux value of the Hall IC, causing a change in the output value of the torque sensor, resulting in a problem that the degree of twist of the torsion bar cannot be measured accurately.

[0008] In particular, as vehicles become more and more electronic, there are more and more cases in which the torque sensor is affected by external magnetic fields, and so there is a demand for a torque sensor that is not affected by external magnetic fields.

[0009] The sensor is mounted on a board, which is then fixed to the middle housing. After the board is fixed to the middle housing, the lower housing covers the board. However, such a board fixing structure has problems in that the housing structure is complicated, the assembly process is increased, and the support structure for the sensor is weak.

[0010] In addition, the annular collector can be manufactured by drawing a plate material, but when the collector is manufactured by the drawing method, several additional processes are required, which complicates the manufacturing process and results in a large loss of material. Summary of the Invention [Problem to be solved by the invention]

[0011] An object of the embodiments of the present invention is to provide a sensing device capable of avoiding magnetic field interference due to an externally generated magnetic field when measuring torque.

[0012] An object of the embodiment is to provide a sensing device in which the output value does not change significantly in response to the rotation angle even if the center of the collector and the center of the stator teeth change.

[0013] An object of the embodiment is to provide a sensing device that can reduce the number of parts and firmly support a sensor.

[0014] An object of the embodiment is to provide a sensing device that can simplify the manufacturing process of the collector and reduce the loss of collector material.

[0015] The problems to be solved by the embodiments are not limited to those mentioned above, and other problems not mentioned here will be clearly understood by those skilled in the art from the description below. [Means for solving the problem]

[0016] An embodiment can provide a sensing device that includes a rotor including a stator and a magnet, the stator including first stator teeth and second stator teeth and a collector disposed between the first stator teeth and the second stator teeth, and the collector including a first collector and a second collector having a different length than the first collector.

[0017] An embodiment can provide a sensing device that includes a rotor including a stator and a magnet, the stator including first stator teeth and second stator teeth and a collector arranged between the first stator teeth and the second stator teeth, the collector including a first collector and a second collector, the first collector including a first region including a flat surface and a second region including a curved surface, the second collector including a third region including a flat surface and a fourth region including a curved surface, and the first region and the third region are arranged to correspond to each other.

[0018] Preferably, the first collector includes a first region including a flat surface and a second region including a curved surface, and the second collector includes a third region including a flat surface and a fourth region including a curved surface, and the first region and the third region may be arranged to correspond to each other.

[0019] Preferably, the first stator tooth has a larger radius than the second stator tooth.

[0020] Preferably, the first collector has a larger radius than the second collector and may include a sensor disposed between the first collector and the second collector.

[0021] Preferably, the first region and the third region may be parallel to each other.

[0022] Preferably, the plane of the first region includes a first plane and a second plane, and an angle between the first plane and the second plane may be between 140 degrees and 160 degrees.

[0023] Preferably, the sensor may be disposed between a plane of the first area and a plane of the third area.

[0024] Preferably, the plane of the first region may be disposed within an angle formed by both ends of the plane of the third region and a center thereof.

[0025] Preferably, the first stator tooth includes a first body and a first tooth extending from the first body, the second stator tooth includes a second body and a second tooth extending from the second body, and the first tooth of the first stator tooth and the second tooth of the second stator tooth may radially overlap each other.

[0026] Preferably, the sensor may include first to fourth sensors, the first to fourth sensors being arranged between a plane of the first region and a plane of the third region, the plane of the first region including a first plane and a second plane, the plane of the third region including a third plane and a fourth plane, the first and second sensors being arranged between the first plane and the third plane, and the third and fourth sensors being arranged between the second plane and the fourth plane.

[0027] An embodiment may provide a sensing device including a stator including stator teeth and a rotor including a magnet, the stator teeth including a first stator tooth and a second stator tooth arranged to overlap the first stator tooth in a radial direction from a center of the stator, the first stator tooth includes a first body, a plurality of first teeth protruding from the first body, and a plurality of first extension portions extending from the first body, the second stator tooth includes a plurality of second teeth, one of the plurality of first teeth being arranged to overlap one of the plurality of second teeth in the radial direction, and the first extension portion being arranged to overlap the magnet in an axial direction.

[0028] Preferably, the first stator teeth include a third tooth, which protrudes from the first extension portion and is disposed to overlap the magnet in the radial direction.

[0029] Preferably, the third tooth includes a third tooth-1 and a third tooth-2, the third tooth-1 protruding from one region of the first extension portion and the third tooth-2 protruding from another region of the first extension portion, and the third tooth-1 and the third tooth-2 may be disposed apart from each other.

[0030] Preferably, the 3-1 tooth and the 3-2 tooth may have the same shape.

[0031] Preferably, the third tooth may include a groove disposed concavely in a distal end surface.

[0032] Preferably, the third tooth may include a hole extending through an inner surface and an outer surface of the third tooth.

[0033] Preferably, the 3-1 tooth and the 3-2 tooth may be disposed such that their widths increase toward the first extension portion.

[0034] Preferably, the first stator tooth includes a first region in which the first extension portion is arranged between the first teeth in the circumferential direction, and a second region in which the first extension portion is not arranged between the first teeth in the circumferential direction, and the first region and the second region may be arranged alternately along the circumferential direction.

[0035] Preferably, the first stator teeth include a third tooth, which protrudes from the first extension portion and is disposed to overlap the magnet in the radial direction.

[0036] Preferably, the second stator teeth include a 2-1 stator tooth including a portion of the plurality of second teeth and a 2-2 stator tooth including the remainder of the plurality of second teeth, and the 2-1 stator tooth and the 2-2 stator tooth may be disposed spaced apart from each other.

[0037] Preferably, the first stator tooth includes a second extension portion extending from the first extension portion, and the second extension portion may be disposed to radially overlap the first body.

[0038] An embodiment can provide a sensing device including a stator including first stator teeth and second stator teeth, a rotor including a magnet, a collector arranged between the first stator teeth and the second stator teeth, a sensor arranged corresponding to the collector, a connector pin connected to an external power source, a plurality of plates electrically connecting the sensor and the connector pin, and a housing in which the collector and the connector pin are arranged, wherein the plates include a first surface, a second surface, and a third surface respectively positioned differently from each other, and the first surface, the second surface, and the third surface each contact the housing.

[0039] An embodiment can provide a sensing device including a stator including a first stator tooth and a second stator tooth, a rotor including a magnet, a collector arranged between the first stator tooth and the second stator tooth, a sensor arranged corresponding to the collector, a connector pin connected to an external power source, a plurality of plates electrically connecting the sensor and the connector pin, and a housing in which the collector and the connector pin are arranged, wherein the plurality of plates are arranged spaced apart from each other, and the housing includes a partition wall arranged between adjacent plates.

[0040] Preferably, the first surface and the second surface are disposed opposite to each other, and the third surface can connect the first surface and the second surface.

[0041] Preferably, the first surfaces of the plurality of plates may be arranged on the same plane.

[0042] Preferably, the second surfaces of the plurality of plates may be arranged on the same plane.

[0043] Preferably, the barrier ribs may include a first barrier rib arranged along a first direction, and a second barrier rib bent from the first barrier rib and arranged along a second direction different from the first direction.

[0044] Preferably, the sensor may include a first sensor and a second sensor, and the plate may include a first plate connecting the first sensor and the connector pin, a second plate connecting the second sensor and the connector pin, and a third plate connecting the first sensor and the second sensor and connecting the connector pin.

[0045] Preferably, the plate may include a first part disposed along a first direction, and a second part bent from the first part and disposed along a second direction different from the first direction.

[0046] Preferably, at least one of the first part and the second part may be arranged in a plurality of pieces.

[0047] Preferably, the sensor includes a first sensor and a second sensor, the plate includes a plurality of first holes arranged along a first row to which lead wires of the first sensor are connected, and a plurality of second holes arranged along a second row to which lead wires of the second sensor are connected, and the first row and the second row may be arranged to form an angle.

[0048] An embodiment can provide a sensing device that includes a stator and a rotor including a magnet, the stator including first stator teeth and second stator teeth and a collector disposed between the first stator teeth and the second stator teeth, and the collector is connected such that one side end and the other side end are in contact with each other and are arranged to overlap in a first direction.

[0049] Preferably, the first direction is a width direction of the collector, and the collector may include a protrusion protruding from the other end and a groove disposed concavely at the one end and disposed in the protrusion.

[0050] Preferably, the protrusion may include one region having a width greater than a width of the connecting portion and the other end of the protrusion.

[0051] Preferably, the collector includes a first region including a flat surface and a second region including a curved surface, and a width of the one end and a width of the other end may be greater than a width of the first region and a width of the second region.

[0052] Preferably, the one side end and the other side end may be disposed to overlap in the first direction as well as in a second direction different from the first direction.

[0053] Preferably, the first direction is a radial direction of the collector, and an overlapping region between the one side end and the other side end may be a plane.

[0054] Preferably, the collector may include a third region and a fourth region having a thickness different from that of the third region.

[0055] Preferably, the first direction is a radial direction of the collector, the one side end includes a fifth region and a sixth region arranged to overlap in the first direction, and the other side end includes a seventh region and an eighth region arranged to overlap in the first direction.

[0056] Preferably, the one side end portion and the other side end portion may be alternately arranged in the radial direction.

[0057] Preferably, the one side end and the other side end may have a locking structure for interlocking with each other. Effect of the Invention

[0058] The sensing device according to the embodiment having the above-mentioned configuration can prevent or minimize magnetic field interference caused by an external magnetic field generated from outside when measuring torque by disposing a collector between a pair of stator teeth and disposing a sensor between the collectors.

[0059] In addition, the first tooth of the first stator tooth and the second tooth of the second stator tooth, which are arranged radially spaced apart from each other, can be arranged to overlap each other, and a magnet can be rotated between the first tooth and the second tooth, so that the first tooth and the second tooth can be charged to different poles.

[0060] It also has the advantage that the magnitude of the collected flux can be increased.

[0061] In addition, magnetic field interference caused by an external magnetic field generated by entering from inside the stator holder can be prevented or minimized.

[0062] In addition, magnetic field interference caused by an external magnetic field entering from the side of the sensing device can be prevented or minimized.

[0063] Also, according to the embodiment, there is an advantage that the output value does not change significantly in response to the rotation angle even if the center of the collector is different from the center of the stator teeth.

[0064] In addition, according to the embodiment, there are advantages in that scrap is reduced in manufacturing the stator teeth and the assemblability of the stator teeth is improved.

[0065] Another advantage is that the number of parts is reduced by removing the substrate. Also, there is an advantage in that a separate housing for covering the board is eliminated, thereby reducing the number of parts.

[0066] It also simplifies the manufacturing process of the collector and reduces waste of collector material.

[0067] Various advantageous and beneficial effects of the embodiments are not limited to the above, but can be more easily understood in the course of describing specific embodiments of the embodiments. [Brief description of the drawings]

[0068] [Figure 1] 1 is an exploded perspective view showing a sensing device according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view showing a stator of the sensing device. [Diagram 3] FIG. 4 is a cross-sectional view showing a stator of the sensing device. [Figure 4] FIG. 2 is a plan view showing a stator body of the stator. [Diagram 5] FIG. 2 is a cross-sectional view showing a stator body of the stator. [Figure 6]FIG. 2 is a cross-sectional view showing a stator body of the stator. [Figure 7] FIG. 4 is a side view showing a first stator tooth. [Figure 8] FIG. 4 is a side view showing a second stator tooth. [Figure 9] FIG. 2 is a plan view showing first stator teeth, second stator teeth, and magnets. [Figure 10] This is a diagram showing the first and second poles of a magnet. [Figure 11] FIG. 11 is a diagram showing a second angle. [Figure 12] FIG. 11 is a diagram showing a third angle. [Figure 13] 1 is a graph showing flux with respect to a first angle, a second angle, and a third angle. [Figure 14] 4 is a perspective view showing the arrangement of magnets relative to first stator teeth and second stator teeth. FIG. [Figure 15] FIG. 4 is a perspective view showing a first stator tooth. [Figure 16] FIG. 4 is a perspective view showing a second stator tooth. [Figure 17] FIG. 4 is a plan view of a first stator tooth. [Figure 18] 2 is a plan view of a first stator tooth and a second stator tooth. FIG. [Figure 19] FIG. 1 is a diagram showing a first tooth, a second tooth, and a third tooth arranged on concentric circles. [Figure 20] 4 is a plan view of the first stator tooth and the second stator tooth, illustrating the flow of an external magnetic field entering from inside the stator holder. FIG. [Figure 21] FIG. 4 is a cross-sectional view of the first stator tooth showing the flow of an external magnetic field guided by the third tooth. [Figure 22] FIG. 2 is a perspective view showing a first collector. [Figure 23] FIG. 4 is a perspective view showing a second collector. [Figure 24]FIG. 2 is a plan view of the first collector, the second collector, and the sensor. [Diagram 25] FIG. 13 is a diagram showing the stator teeth and the avoidance of an external magnetic field. [Figure 26] FIG. 2 is a diagram showing a housing and a collector. [Figure 27] FIG. [Figure 28] 4 is a diagram showing the radial distances between a first stator tooth, a first collector, a second collector, and a second stator tooth. FIG. [Figure 29] FIG. [Diagram 30] 1 is a graph showing the change in measured torque induced by an external magnetic field as a function of rotation angle. [Diagram 31] FIG. 2 is a diagram showing a first gear and a second gear that mesh with a main gear. [Diagram 32] FIG. 11 is a perspective view showing a stator of a sensing device according to a second embodiment. [Diagram 33] FIG. 11 is a diagram showing a first stator tooth and a second stator tooth according to a first modified example. [Diagram 34] 34 is a diagram showing the first stator tooth shown in FIG. 33. FIG. [Diagram 35] 13 is a diagram showing a first stator tooth and a second stator tooth according to a second modified example. FIG. [Diagram 36] 36 is a diagram showing the first stator tooth shown in FIG. 35. FIG. [Figure 37] 13 is a diagram showing a first stator tooth and a second stator tooth according to a third modified example. FIG. [Figure 38] 36 is a diagram showing the second stator tooth shown in FIG. 35. FIG. [Figure 39] FIG. 13 is a diagram showing a first stator tooth and a second stator tooth according to a fourth modified example. [Diagram 40] 40 is a diagram showing the first stator tooth shown in FIG. 39. [Diagram 41]FIG. 2 is a perspective view showing a sensor, a connector pin, and a plate. [Diagram 42] A top view of the sensor, connector pins, and plate shown in Figure 41. [Diagram 43] 43 is a side cross-sectional view of the plate taken along line AA in FIG. 42. [Diagram 44] FIG. 43 is a side cross-sectional view of the plate taken along line BB in FIG. 42. [Diagram 45] FIG. 2 is a perspective view showing a first collector. [Figure 46] FIG. 4 is a perspective view showing a second collector. [Figure 47] FIG. 2 is an enlarged view showing one end and the other end of the collector. [Figure 48] 13A and 13B are views showing one end and the other end of a collector according to another modified example. [Figure 49] 13 is a view showing one end and the other end of a collector according to another modified example. FIG. [Figure 50] FIG. 2 is a diagram showing the directionality of an external magnetic field relative to a stator tooth. [Figure 51] FIG. 13 is a diagram showing the avoidance state of the sensor against an external magnetic field having a z-axis direction. [Figure 52] 13 is a graph comparing the comparative example and the embodiment with respect to the amount of angular change corresponding to an external magnetic field in the z-axis direction. [Figure 53] 13 is a graph comparing the comparative example and the embodiment with respect to the amount of angular change corresponding to an external magnetic field in the y′-axis direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0069] Fig. 1 is an exploded perspective view showing a sensing device according to an embodiment, and Fig. 2 is a perspective view showing a stator of the sensing device according to an embodiment. In Fig. 1 and Fig. 2, the z direction means the axial direction, and the y direction means the radial direction. The axial direction and the radial direction are perpendicular to each other.

[0070] 1 and 2, the sensing device according to the embodiment may include a stator 100, a rotor 200 partially disposed on the stator 100, a sensor 500, a circuit board 600 electrically connected to the sensor 500, and a housing 700 to which the circuit board 600 is coupled.

[0071] Here, the stator 100 is connected to an output shaft (not shown), and the rotor 200, at least a portion of which is rotatably disposed on the stator 100, may be connected to an input shaft (not shown), but is not necessarily limited thereto.

[0072] In this case, the rotor 200 may be rotatably disposed with respect to the stator 100. Hereinafter, the term "inner" may refer to a direction facing the center C based on the radial direction, and the term "outer" may refer to a direction opposite to the inner side.

[0073] FIG. 3 is a cross-sectional view showing a stator of a sensing device according to an embodiment.

[0074] The stator 100 may be coupled to a steering shaft output shaft (not shown).

[0075] 1 to 3, a stator 100 may include a stator holder 110, a stator body 120, a first stator tooth 130, and a second stator tooth 140.

[0076] The stator holder 110 may be connected to an output shaft of an electric steering device. As a result, the stator holder 110 may rotate in conjunction with the rotation of the output shaft. The stator holder 110 may be formed in a cylindrical shape. The stator holder 110 may be made of a metal material, but is not limited thereto, and the stator holder 110 may be made of other materials having a certain level of strength so that the output shaft can be fitted and fixed thereto.

[0077] The stator holder 110 may include a groove 111. The groove 111 is formed as a concave surface on the outer circumferential surface of the stator holder 110. The groove 111 is disposed along the outer circumferential surface of the stator holder 110. A separate fixing member may be inserted into the groove 111.

[0078] The stator holder 110 may be coupled to a stator body 120 .

[0079] The stator body 120 may be disposed at one end of the stator holder 110. The stator body 120 may be coupled to the stator holder 110 by an insert injection method using a synthetic resin such as resin. A main gear 120a may be formed on the outer circumferential surface of the stator body 120. The main gear 120a transmits the rotational force of the stator 100 to a first gear (10 in FIG. 31) and a second gear (20 in FIG. 31).

[0080] The first stator tooth 130 and the second stator tooth 140 may be disposed radially spaced apart from each other. The first stator tooth 130 and the second stator tooth 140 may be fixed to the stator body 120. The first stator tooth 130 includes a first body 131, a first tooth 132, and a third tooth 133. The second stator tooth 140 includes a second body 141 and a second tooth 142.

[0081] FIG. 4 is a plan view showing a stator body of the stator, and FIGS. 5 and 6 are cross-sectional views showing the stator body of the stator.

[0082] 4 to 6, the stator body 120 includes an inner part 121, an outer part 122, and a partition plate 123. The inner part 121 and the outer part 122 are cylindrical. The outer part 122 is disposed outside the inner part 121 with a space therebetween in the radial direction. The partition plate 123 connects the inner part 121 and the outer part 122. The inner part 121, the outer part 122, and the partition plate 123 may be integral with each other. The stator holder 110 may be coupled to the inside of the inner part 121. A space S may be formed between the outer part 122 and the inner part 121. The partition plate 123 may be formed in a plate shape. The partition plate 123 may be disposed between the inner part 121 and the outer part 122.

[0083] The space S may be divided into a first space S1 and a second space S2 by the partition 123. The sensor 500 may be disposed in the first space S1, and the magnet 230 may be disposed in the second space S2. The partition 123 may be disposed below an imaginary horizontal line L1. Here, the imaginary horizontal line L1 passes through the center of the outer part 122 with respect to the axial direction.

[0084] Meanwhile, the partition plate 123 may include a first hole 124 and a second hole 125. The first hole 124 and the second hole 125 are for disposing the first stator teeth 130 and the second stator teeth 140.

[0085] A first body 131 and a second body 141 may be disposed in the first space S1. A first tooth 132 and a second tooth 142 may be disposed in the second space S2.

[0086] A plurality of first holes 124 may be formed spaced apart from each other in the circumferential direction. The first teeth 132 are disposed in the second space S2 by passing through the first holes 124. In this case, the number of the first holes 124 is the same as the number of the first teeth 132. The first holes 124 may be disposed adjacent to an inner circumferential surface of the outer portion 122. As shown in FIG. 5, the first holes 124 may be formed in the partition 123 to contact the inner circumferential surface of the outer portion 122.

[0087] The second holes 125 may be formed in a plurality of spaces apart from each other in the circumferential direction. In this case, the second holes 125 may be disposed spaced apart from each other on the inside of the first holes 124 in the radial direction. The second teeth 142 are disposed in the second space S2 by passing through the second holes 125. In this case, the number of the second holes 125 is the same as the number of the second teeth 142 of the second stator tooth 140. The second holes 125 may be disposed adjacent to the outer circumferential surface of the inner portion 121. As shown in FIG. 8, the second holes 125 may be formed in the partition plate 123 to contact the outer circumferential surface of the inner portion 121.

[0088] The third holes 127 may be formed in a plurality of positions spaced apart from each other in the circumferential direction. The third holes 127 may be disposed between the second holes 125 in the circumferential direction. The third teeth 133 may be disposed in the second space S2 by passing through the third holes 127. In this case, the number of the third holes 127 may be the same as the number of the third teeth 133 of the first stator teeth 130. The third holes 127 may be disposed adjacent to an outer circumferential surface of the inner portion 121. The third holes 127 may be formed in the partition plate 123 to be in contact with the outer circumferential surface of the inner portion 121.

[0089] The first stator teeth 130 and the second stator teeth 140 may be disposed between an outer circumferential surface of the inner part 121 and an inner circumferential surface of the outer part 122 of the stator body 120. Here, the first stator teeth 130 and the second stator teeth 140 may be formed of a metallic material in order to be charged by the rotation of the magnet 230.

[0090] The first stator teeth 130 may be fixed to an inner circumferential surface of the outer portion 122 by an adhesive member (not shown) such as a glue, and the second stator teeth 140 may be fixed to an outer circumferential surface of the inner portion 121 by an adhesive member (not shown) such as a glue, but are not necessarily limited thereto. For example, the first stator teeth 130 and the second stator teeth 140 may be fixed to the stator body 120 by a fastening member (not shown) or a caulking method, etc.

[0091] A boss 126 is disposed extending from the lower side of the partition plate 123. A side wall of the boss 126 and an outer portion 122 are spaced apart to form a first slot U1. A first tooth 132 is inserted into the first slot U1 and passes through the first hole 124 to be located in a second space S2. A side wall of the boss 126 and an inner portion 121 are spaced apart to form a second slot U2. A second tooth 142 and a third tooth 133 are inserted into the second slot U2 and pass through the second hole 125 and the third hole 127, respectively, to be located in the second space S2.

[0092] The first slot U1 guides the first tooth 132 into the first hole 124 during the process of coupling the first stator tooth 130 to the stator body 120, thereby facilitating the coupling.

[0093] The second slot U2 guides the second tooth 142 and the third tooth 133 into the second hole 125 and the third hole 127, respectively, during the process of coupling the second stator tooth 140 to the stator body 120, making the coupling easier.

[0094] FIG. 7 is a side view showing the first stator tooth, and FIG. 8 is a side view showing the second stator tooth.

[0095] 2 and 7, the first stator tooth 130 may include a first body 131 and a plurality of first teeth 132 spaced apart from each other and protruding from the first body 131 in the axial direction.

[0096] 2 and 8, the second stator teeth 140 may include a second body 141 and a plurality of second teeth 142 spaced apart from each other and protruding from the second body 141 in the axial direction.

[0097] A height H1 of the first body 131 based on the top surface 131a of the first body 131 is smaller than a height H2 of the first tooth 132. And a height H3 of the second body 141 based on the top surface 141a of the second body 141 is smaller than a height H4 of the second tooth 142. However, the present invention is not limited to this, and the height H2 of the first tooth 132 and the height H4 of the second tooth 142 may be different from each other.

[0098] FIG. 9 is a plan view showing the first stator teeth, the second stator teeth, and the magnets.

[0099] 9, the first stator teeth 130 are disposed outside the second stator teeth 140. When viewed in the radial direction (y direction), the first teeth 132 and the second teeth 142 may be disposed to overlap in the radial direction. Such an arrangement of the first teeth 132 and the second teeth 142 has the effect of reducing magnetic flux leakage.

[0100] FIG. 10 is a diagram showing the first and second poles of a magnet. 10, the magnet includes a first pole 230A and a second pole 230B. The first pole 230A and the second pole 230B may be alternately arranged along the circumferential direction of the magnet.

[0101] The first pole 230A and the second pole 230B may each include a north pole region NA and a south pole region SA. The first pole 230A and the second pole 230B may each have a multi-layer structure in which the north pole region NA and the south pole region SA are divided into inner and outer layers.

[0102] The first pole 230A may have an N pole region NA disposed relatively outside and an S pole region SA disposed inside the N pole region NA. The second pole 230B may have an N pole region NA disposed relatively inside and an S pole region SA disposed outside the N pole region NA.

[0103] The north pole region NA of the first pole 230A and the south pole region SA of the second pole 230B are disposed adjacent to each other. The south pole region SA of the first pole 230A and the north pole region NA of the second pole 230B are disposed adjacent to each other.

[0104] When the magnet 230 rotates and the first tooth 132 approaches the S pole area SA and is charged with a S pole, the second tooth 142 approaches the N pole area NA and is charged with a N pole. Or, when the magnet 230 rotates and the first tooth 132 approaches the N pole area NA and is charged with a N pole, the second tooth 142 approaches the S pole area SA and is charged with a S pole. Thus, the sensor 500 can measure an angle through a magnetic field applied through the first stator tooth 130, the second stator tooth 140, and the collector (800 in FIG. 22).

[0105] The first tooth 132 and the second tooth 142 of the sensing device according to the embodiment overlap in the radial direction. Both ends of the second tooth 142 may overlap the first tooth 132. For example, in designing the positions and sizes of the first tooth 132 and the second tooth 142, the first angle θ1, the second angle (θ2 in FIG. 11), and the third angle (θ3 in FIG. 12) may be the same.

[0106] The first angle θ1 indicates an angle formed by both ends of the first pole 230A with respect to the center C of the stator. For example, when there are eight first poles 230A and eight second poles 230B, the first angle θ1 may be 22.5°.

[0107] FIG. 11 is a diagram showing the second angle θ2, and FIG. 12 is a diagram showing the third angle θ3.

[0108] 11, the second angle θ2 indicates an angle formed by both ends P1 of the first tooth 132 with respect to the center C of the stator. A reference point G that defines both ends P1 of the first tooth 132 in the axial direction is as follows. When the first tooth 132 is disposed facing the body 231 of the magnet 230, the reference point G corresponds to a point of the first tooth 132 that corresponds to a midpoint of the height H1 of the body 231 of the magnet 230. The height H1 of the body 231 of the magnet 230 refers to the height formed by the upper surface 231a and the lower surface 231b of the magnet 230 with respect to the axial direction. An angle θ4 between the first tooth 132 and the first tooth 132 at the reference point G may be equal to the second angle θ2.

[0109] 12, the third angle θ3 refers to the angle formed by both ends P2 of the second tooth 142 with respect to the center C of the stator. A reference point G that defines both ends P2 of the second tooth 142 in the axial direction is as follows. When the second tooth 142 is disposed facing the body 231 of the magnet 230, the reference point G corresponds to a point on the second tooth 142 that corresponds to the midpoint of the height H1 of the body 231 of the magnet 230. Angle θ5 between the second tooth 142 and the second tooth 142 at reference point G may be equal to the third angle θ3.

[0110] FIG. 13 is a graph showing flux with respect to the first angle θ1, the second angle θ2, and the third angle θ3.

[0111] 13, when the second angle θ2 and the third angle θ3 are set to be the same, the magnitude of the flux increases as the second angle θ2 and the third angle θ3 approach the first angle θ1, and the magnitude of the flux decreases as the second angle θ2 and the third angle θ3 move away from the first angle θ1. It can be seen that when the sizes and positions of the first tooth 132 and the second tooth 142 are aligned so that the second angle θ2 and the third angle θ3 are the same as the first angle θ1, the magnitude of the flux of the first and second stator teeth 130 and 140 is the largest.

[0112] 1, the rotor 200 may include a rotor holder 210, a rotor body 220, and a magnet 230. The rotor holder 210, the rotor body 220, and the magnet 230 may be integral with each other.

[0113] The rotor holder 210 may be connected to an input shaft of an electric steering device. As a result, the rotor holder 210 may rotate in conjunction with the rotation of the input shaft. The rotor holder 210 may be formed in a cylindrical shape. An end of the rotor holder 210 may be coupled to the rotor body 220. The rotor holder 210 may be made of a metal material, but is not limited thereto, and the rotor holder 210 may of course be made of other materials having a certain level of strength so that the input shaft can be fitted and fixed thereto.

[0114] The rotor body 220 is disposed on one side of the outer circumferential surface of the rotor holder 210. The rotor body 220 may be an annular member.

[0115] The magnet 230 is coupled to the rotor body 220. When the rotor holder 210 rotates, the magnet 230 rotates in conjunction with the rotor body 220.

[0116] FIG. 14 is a perspective view showing the arrangement of magnets relative to the first stator teeth and the second stator teeth.

[0117] 14, the magnet 230 is disposed between the first tooth 132 and the second tooth 142. And, the magnet 230 is disposed between the third tooth 133 and the first tooth 132.

[0118] The body 231 of the magnet 230 is disposed facing the first tooth 132, the second tooth 142, and the third tooth 133. The protrusion 232 of the magnet 230 is disposed above the first tooth 132, the second tooth 142, and the third tooth 133.

[0119] FIG. 15 is a perspective view showing the first stator tooth. 15, the first stator tooth 130 may include a first body 131, a first tooth 132, a third tooth 133, and an extension 134. The first body 131 may be a ring-shaped member. The first teeth 132 may be spaced apart from each other along a circumferential direction and may extend upward from an upper side of the first body 131. The first body 131 and the plurality of first teeth 132 may be integrally formed. The extension 134 protrudes inward from the first body 131. The third tooth 133 is connected to the extension 134.

[0120] The first tooth 132 and the third tooth 133 may be formed in a shape that is wider at the bottom and narrower at the top. For example, when viewed in a radial direction, the width of the lower side of each of the first tooth 132 and the third tooth 133 may be greater than the width of the upper side. The first tooth 132 and the third tooth 133 may be formed in a trapezoidal shape. In addition, the first tooth 132 may pass through the first hole 124, and the third tooth 133 may pass through the third hole 127, so that the upper surface of the first body 131 and the upper surface of the extension 134 may contact the lower surface of the partition plate 123.

[0121] FIG. 16 is a perspective view showing the second stator tooth. 16, the second stator tooth 140 may include a second body 141 and a second tooth 142. The second teeth 142 may be spaced apart from each other along the circumferential direction and may extend upward from an upper side of the second tooth 142. The second body 141 and the plurality of second teeth 142 may be integrally formed. The second tooth 142 may be formed in a shape that is wider at the bottom and narrower at the top. For example, when viewed in the radial direction, the width of the lower side of the second tooth 142 may be greater than the width of the upper side. The second tooth 142 may include a trapezoidal shape.

[0122] The second body 141 may include a protrusion 141a. The protrusion 141a may be an annular member that is bent and protrudes outward from the second tooth 142. The protrusion 141a reduces the air gap between the sensor 500 and the second body 141, thereby increasing the amount of flux applied to the sensor 500.

[0123] FIG. 17 is a plan view of the first stator tooth. 17, the shortest distance R1 from the center C of the first stator tooth 130 to the first tooth 132 is longer than the shortest distance R2 from the center C of the first stator tooth 130 to the third tooth 133. Relatively, the third tooth 133 is disposed closer to the center C of the first stator tooth 130 than the first tooth 132. This is to guide the external magnetic field flowing in from inside the stator holder 110 to the third tooth 133.

[0124] FIG. 18 is a plan view of the first stator tooth and the second stator tooth.

[0125] 18, a diameter D3 formed by the plurality of third teeth 133 is smaller than a diameter D1 formed by the plurality of first teeth 132, and a diameter D2 formed by the plurality of second teeth 142 is smaller than a diameter D1 formed by the plurality of first teeth 132. With respect to the magnet 230 as a reference, the first teeth 132 are disposed outside the magnet 230, and the second teeth 142 and the third teeth 133 are disposed inside the magnet 230.

[0126] FIG. 19 is a diagram showing a first tooth, a second tooth, and a third tooth arranged on concentric circles.

[0127] 19, the first tooth 132, the second tooth 142, and the third tooth 133 may be arranged on concentric circles. The second tooth 142 and the third tooth 133 may be arranged on a virtual first circumference O1, and the first tooth 132 may be arranged on a virtual second circumference O2 different from the virtual first circumference O1. The second tooth 142 and the third tooth 133 may be arranged alternately along the circumferential direction of the stator 100. The first circumference O1 is arranged inside the second circumference O1. This is to disperse the external magnetic field flowing from the inside of the stator holder 110 in all directions through the second tooth 142 and the third tooth 133.

[0128] On the other hand, the circumferential width t3 of the lower end of the third tooth 133 may be smaller than the circumferential width t1 of the lower end of the first tooth 132. Moreover, the circumferential width t3 of the lower end of the third tooth 133 may be smaller than the circumferential width t2 of the lower end of the second tooth 142.

[0129] Figure 20 is a plan view of the first stator tooth and the second stator tooth showing the flow of the external magnetic field flowing in from the inside of the stator holder, and Figure 21 is a cross-sectional view of the first stator tooth showing the flow of the external magnetic field guided by the third tooth.

[0130] 20, external magnetic fields W1 and W2 flowing along the stator holder 110 flow toward the first stator tooth 130 and the second stator tooth 140 in the radial direction of the stator 100. The external magnetic fields W1 and W2 are dispersed and guided to the third tooth 133 together with the second tooth 142.

[0131] 21, the external magnetic field W1 flowing into the third tooth 133 is guided to the extension 134. At this time, the external magnetic field M1 flowing into the third tooth 133 can be offset with the external magnetic field M2 flowing from the magnet 230 to the first tooth 132 and guided to the extension 134. As such, since the external magnetic field flowing along the stator holder 110 is guided to the first stator tooth 130 and offset, there is an advantage that the influence of the external magnetic field on the sensor 500 is greatly reduced.

[0132] Table 1 below compares the torque of the comparative example and the embodiment.

[0133] [Table 1]

[0134] Comparative Example 1 is a sensing device that does not have a structure such as the third tooth 133. The Example is a sensing device that includes the third tooth 133. When there is no external magnetic field in the radial direction, the normal torque is 0 Nm. In Comparative Example 1 and the Example, when an external magnetic field (1000 A / m) is applied in the radial direction, a torque of 0.41 Nm is measured in the Comparative Example, indicating that it is greatly affected by the external magnetic field. However, in the Example, the measured torque is 0.05 Nm, indicating that it is hardly affected by the external magnetic field.

[0135] However, the radial gap between the first and second stator teeth 130, 140 and the sensor 500 determines the amount of flux. When the gap between the first and second stator teeth 130, 140 and the sensor 500 decreases, the flux passing through the sensor 500 increases, and the sensitivity of the measured magnetic flux increases. Conversely, when the gap between the first and second stator teeth 130, 140 and the sensor 500 decreases, the flux passing through the sensor 500 decreases, and the sensitivity of the measured magnetic flux decreases. Therefore, the wobble value may increase significantly depending on the deviation of the gap between the first and second stator teeth 130, 140 and the sensor 500.

[0136] FIG. 22 is a perspective view showing the first collector, FIG. 23 is a perspective view showing the second collector, and FIG. 24 is a plan view of the first collector, the second collector, and the sensor.

[0137] 22 to 24, the collector 800 may include a first collector 810 and a second collector 820. The first collector 810 and the second collector 820 collect the flux of the stator 100, respectively. The first collector 810 and the second collector 820 may be made of a metal material. The first collector 810 and the second collector 820 are disposed radially apart from each other with the center C of the stator being coaxial. A radius G1 of the first collector 810 may be larger than a radius G2 of the second collector 820. The length of the first collector 810 may be larger than the length of the second collector 820. Here, the length may correspond to the circumferential length of the first collector 810 and the circumferential length of the second collector 820 when the first collector 810 and the second collector 820 are ring-shaped members, respectively.

[0138] The second collector 820 may be disposed inside the first collector 810 in the radial direction from the center C of the stator. The first collector 810 and the second collector 820 may each be a ring-shaped member. Since the first collector 810 and the second collector 820 are each a ring-shaped member, the collector 800 can cover the entire area of ​​the first and second stator teeth 130 and 140 along the circumferential direction. As a result, when considering the entire area of ​​the first and second stator teeth 130 and 140, there is an advantage that the sensitivity of the measured magnetic flux due to the deviation of the gap between the first and second stator teeth 130 and 140 and the sensor 500 is complementarily stabilized, and the wobble value is improved.

[0139] The first collector 810 may include first regions 812, 813 and a second region 811. The first regions 812, 813 are regions including a flat surface, and the second region 811 is a region including a curved surface. The second collector 820 may include third regions 822, 823 and a fourth region 821. The third regions 822, 823 are regions including a flat surface, and the fourth region 821 is a region including a curved surface. The first regions 812, 813 and the third regions 822, 823 are disposed corresponding to each other. For example, the planes of the first regions 812, 813 may be disposed within an angle Q1 formed by both ends X1, X2 of the planes of the third regions 822, 823 and the center C.

[0140] The first regions 812 and 813 and the third regions 822 and 823 may be arranged parallel to each other. The first regions 812 and 813 may include a first plane 812 and a second plane 813. And, the second region 811 may include a third plane 822 and a fourth plane 823.

[0141] The second region 811 and the fourth region 821 may each include a protrusion 814, 824. The protrusion 814, 824 is disposed to extend downward from the lower end of the second region 811 or the lower end of the fourth region 821, respectively. The protrusions 814, 824 are for coupling the housing 700 and the collector 800.

[0142] The sensor 500 detects a change in the magnetic field generated between the stator 100 and the rotor 200. The sensor 500 may be a Hall IC. The sensor 500 detects the amount of magnetization of the stator 100 generated by electrical interaction between the magnet 230 of the rotor 200 and the stator 100. The sensing device measures the torque based on the detected amount of magnetization.

[0143] The sensor 500 may be disposed between the plane of the first regions 812 , 813 and the plane of the second region 811 .

[0144] The sensor 500 may include a first sensor 510, a second sensor 520, a third sensor 530, and a fourth sensor 540. The first sensor 510 and the second sensor 520 may be disposed between a first plane 812 and a third plane 822. The third sensor 530 and the fourth sensor 540 may be disposed between a second plane 813 and a fourth plane 823.

[0145] FIG. 25 is a diagram showing the stator teeth 130, 140 and the avoidance of an external magnetic field.

[0146] Referring to FIG. 25, the first collector 810 together with the first stator tooth 130 acts as a shield against external magnetic fields directed towards the sensor 500 .

[0147] The external magnetic field has a large effect on the sensing device in the y'-axis direction. Here, the y'-axis direction refers to the radial direction perpendicular to the axial direction, which is toward the sensor 500. The external magnetic field in the y'-axis direction is induced along the first stator teeth 130 and the second stator teeth 140 as shown by S1 in Fig. 25, and therefore flows without affecting the sensor 500. As a result, the sensing device according to the embodiment has an advantage that the effect of the external magnetic field on the sensor 500 is small even when the y'-axis direction is taken as the reference.

[0148] 25 by the first collector 810, the external magnetic field directed toward the sensor 500 can flow without affecting the sensor 500 disposed inside the first collector 810. As a result, the sensing device according to the embodiment has an advantage that the external magnetic field has a small effect on the sensor 500 even when the y'-axis direction is taken as the reference.

[0149] [Table 2]

[0150] The comparative example in Table 2 includes first stator teeth 130 and second stator teeth 140 like the embodiment, but unlike the embodiment, it is a sensing device including a semicircular single collector. The embodiment is a sensing device including ring-shaped first collector 810 and second collector 820. When there is no external magnetic field in the radial direction, the normal torque is ONm. In the comparative example and embodiment in Table 2, when an external magnetic field (1000A / m) is applied in the axial and y'-axis directions, the torque is measured at 0.10Nm and 0.08Nm, respectively, in the embodiment, which shows that it is less affected by the external magnetic field than the comparative example.

[0151] FIG. 26 is a diagram showing the housing 700 and the collector 800, and FIG.

[0152] 26 and 27, the collector 800 is mounted to the housing 700 .

[0153] The housing 700 may include a housing body 710, a first protrusion 760, a second protrusion 720, and a third protrusion 730. The housing body 710 may have a plate shape including an upper surface and a lower surface, and the upper and lower surfaces may be open. A hole 701 is disposed at the center of the housing body 710. The stator holder 110 is disposed inside the hole 701. The circuit board 600 may be mounted on the lower surface of the housing body 710. The sensor 500 is mounted on the circuit board 600. The sensor 500 may be disposed on the upper surface of the housing 700 through a hole 740 of the housing 700. A separate cover may be coupled to the lower side of the housing body 710 to cover the circuit board 600. In addition, the housing 700 may be provided with a groove 750 into which the protrusions 814 and 824 of the collector 800 are inserted.

[0154] The second protrusion 720 may protrude axially from the upper surface of the housing 700. The second protrusion 720 may be arranged along the circumference of the hole 701. The second protrusion 720 may be an arc-shaped member. The second protrusion 720 may be arranged radially between the first collector 810 and the second collector 820. The outer peripheral surface of the second protrusion 720 may contact the inner peripheral surface of the first collector 810, and the inner peripheral surface of the second protrusion 720 may contact the outer peripheral surface of the second collector 820.

[0155] The third protrusion 730 may be disposed to protrude in the axial direction from an upper surface of the second protrusion 720. The third protrusion 730 may be disposed between the first collector 810 and the second collector 820 in the radial direction. The third protrusion 730 may be a plurality of protrusions. The third protrusions 730 are fused to fix the collector 800 to the housing 700.

[0156] The first protrusion 760 is a member for maintaining a gap between the first collector 810 and the second collector 820. In particular, the first protrusion 760 is a member for maintaining a gap between the first collector 810 and the second collector 820 near the sensor 500. Such a first protrusion 760 protrudes in the axial direction from the second protrusion 720. The first protrusion 760 may be disposed adjacent to the hole 740. The first protrusion 760 may be a cylindrical member.

[0157] FIG. 28 is a diagram illustrating the radial distances between the first stator teeth 130, the first collector 810, the second collector 820, and the second stator teeth 140.

[0158] Referring to FIG. 28, the sum of the radial distance k2 between the first stator tooth 130 and the second region 811 of the first collector 810 and the radial distance k3 between the second stator tooth 140 and the fourth region 821 of the second collector 820 may be smaller than the radial distance k4 between the first regions 812, 813 of the first collector 810 and the third regions 822, 823 of the second collector 820.

[0159] A radial distance k2 between the first stator tooth 130 and the second region 811 of the first collector 810 may be smaller than a radial distance k1 between the second region 811 of the first collector 810 and the fourth region 821 of the second collector 820. In addition, a radial distance k3 between the second stator tooth 140 and the fourth region 821 of the second collector 820 may be smaller than a radial distance k1 between the second region 811 of the first collector 810 and the fourth region 821 of the second collector 820.

[0160] Radially, the first collector 810 and the second collector 820 may be disposed between the first tooth 132 and the third tooth 133 .

[0161] For example, the radial distance k1 between the second region 811 of the first collector 810 and the fourth region 821 of the second collector 820 may be 10.4 mm to 10.8 mm. Also, the radial distance k2 between the first stator tooth 130 and the second region 811 of the first collector 810 may be 0.7 mm to 1.0 mm, and the radial distance k3 between the second stator tooth 140 and the fourth region 821 of the second collector 820 may be 0.55 to 0.85 mm.

[0162] On the other hand, the radial distance k4 between the first regions 812, 813 of the first collector 810 and the third regions 822, 823 of the second collector 820 may be 1.5 mm to 1.9 mm.

[0163] Such radial distances between the first stator tooth 130, the first collector 810, the second collector 820 and the second stator tooth 140 correspond to the optimal distance for a magnetic field to be transmitted from the first stator tooth 130 or the second stator tooth 140 to the first collector 810 or the second collector 820 and for the transmitted magnetic field to be sensed by the sensor 500.

[0164] FIG. 29 is a plan view of the collector showing the angle between the first plane 812 and the second plane 813, and the angle between the third plane 822 and the fourth plane 823.

[0165] 29, a fourth angle A1 formed by the first plane 812 and the second plane 813 of the first collector 810 with respect to a circumferential width center N1 of the first regions 812, 813 may be the same as a fifth angle A2 formed by the third plane 822 and the fourth plane 823 of the second collector 820 with respect to a circumferential width center N2 of the second regions 822, 823. In this case, the fourth angle A1 or the fifth angle A2 may be 140° to 160°.

[0166] When the radial distance k1 between the second region 811 of the first collector 810 and the fourth region 821 of the second collector 820 is 10.4 mm to 10.8 mm, the radial distance k2 between the first stator tooth 130 and the second region 811 of the first collector 810 is 0.7 mm to 1.0 mm, and the radial distance k3 between the second stator tooth 140 and the fourth region 821 of the second collector 820 is 0.55 to 0.85 mm, and when the fourth angle A1 or the fifth angle A2 is 140° to 160°, there is an advantage that no interference occurs between the collector 800 and the first stator tooth 130, or between the collector 800 and the second stator tooth 140.

[0167] FIG. 30 is a graph showing the change in measured torque induced by an external magnetic field as a function of rotation angle.

[0168] Referring to Figure 30, Z0 in Figure 30 indicates the output value of the sensing device corresponding to the rotation angle when the center of the collector 800 is aligned with the center of the sensor device, and when the rotor rotates once, the output value appears constant at around 3.3 degrees.

[0169] Z1 in Figure 30 shows the output value of the sensing device corresponding to the rotation angle when the rotor rotates once with the center of the outer collector offset by 0.2 mm in a sensing device including a semicircular collector. As a result of the measurement, the output value changed significantly in response to the rotation angle, and the wobble value increased by up to 0.33 degrees.

[0170] Z2 in Figure 30 shows the output value of a sensing device including a first collector 810 and a second collector 820 according to an embodiment, when the center of the outer first collector 810 is offset by 0.2 mm from the center of the stator teeth 130, 140 and the rotor 200 rotates once. As a result of the measurement, the output value appears constant in relation to the rotation angle, similar to Z0 in Figure 30. Therefore, it was confirmed that the wobble value is greatly improved, unlike Z1 in Figure 30, despite the center of the first collector 810 being offset.

[0171] FIG. 31 is a diagram showing a first gear and a second gear that mesh with a main gear.

[0172] 31, sub-gears meshing with a main gear 120a include a first gear 10 and a second gear 20. The main gear 120a, the first gear 10, the second gear 20 and a sensor 610 are for measuring the angle of the steering shaft.

[0173] The main gear 120a, the first gear 10, and the second gear 20 rotate while meshing with each other. The main gear 120a is disposed on the outer circumferential surface of the stator body 120. The first gear 10 and the second gear 20 are rotatably disposed in the housing body 710. The gear ratios of the main gear 120a, the first gear 10, and the second gear 20 are determined in advance. For example, when the main gear 120a has a total angle, the first gear 10 may be designed to rotate 15.6 times and the second gear 20 may be designed to rotate 14.625 times when the main gear 120a rotates 4.5 times. Here, the total angle is an angle calculated by accumulating the rotations of the main gear 120a when all the gears return to the state just before they rotated.

[0174] Magnets may be disposed on the first gear 10 and the second gear 20. The magnets are disposed so as to face the sensor 610.

[0175] FIG. 32 is a diagram showing a stator of a sensing device according to a second embodiment.

[0176] 32, the stator of the sensing device according to the second embodiment may include a stator holder 1110, a stator body 1120, a first stator tooth 1130, and a second stator tooth 1140. Hereinafter, only configurations different from those of the sensing device according to the first embodiment will be described, and descriptions of the same configurations will be omitted.

[0177] The first stator tooth 1130 and the second stator tooth 1140 may be disposed radially spaced apart from each other. The first stator tooth 1130 and the second stator tooth 1140 may be fixed to the stator body 1120. The first stator tooth 1130 includes a first body 1131, a first tooth 1132, a third tooth 1133, and an extension 1134. The second stator tooth 1140 includes a second body 1141 and a second tooth 1142.

[0178] The stator holder 1110 may be coupled to a stator body 1120 .

[0179] FIG. 33 is a diagram showing a first stator tooth and a second stator tooth according to a first modified example, and FIG. 34 is a diagram showing the first stator tooth shown in FIG.

[0180] 33 and 34, the first stator tooth 1130 may include a first body 1131, a first tooth 1132, a third tooth 1133, and a first extension 1134. The first body 1131 may be a ring-shaped member. The first teeth 1132 may be spaced apart from each other along a circumferential direction and may extend upward from an upper side of the first body 1131. The first body 1131 and the plurality of first teeth 1132 may be integrally formed. The first extension 1134 protrudes inward from the first body 1131. The third tooth 1133 is connected to the first extension 1134.

[0181] The first tooth 1132 and the third tooth 1133 may be formed in a shape that is wider at the bottom and narrower at the top. For example, when viewed in a radial direction, the width of the lower side of each of the first tooth 1132 and the third tooth 1133 may be greater than the width of the upper side. The first tooth 1132 and the third tooth 1133 may be formed in a trapezoidal shape. In addition, the first tooth 1132 passes through the first hole 1124, and the third tooth 1133 passes through the third hole 1127, so that the upper surface of the first body 1131 and the upper surface of the first extension part 1134 may come into contact with the lower surface of the partition plate 1123.

[0182] The first extension portion 1134 may be disposed to overlap the magnet 1230 in the axial direction, and the third tooth 1133 may be disposed to overlap the magnet 1230 in the radial direction.

[0183] The second stator tooth 1140 may include a second body 1141 and a second tooth 1142. The second teeth 1142 may be spaced apart from each other along the circumferential direction and may extend upward from an upper side of the second tooth 1142. The second body 1141 and the plurality of second teeth 1142 may be integrally formed. The second tooth 1142 may be formed in a shape that is wider at the bottom and narrower at the top. For example, when viewed in the radial direction, the width of the lower side of the second tooth 1142 may be greater than the width of the upper side. The second tooth 1142 may include a trapezoidal shape.

[0184] Meanwhile, the first stator tooth 1130A according to the first modified example may include a first body 1131A, a first tooth 1132A, a third tooth 1133A, and a first extension portion 1134A. The third tooth 1133A may include a third-first tooth 1133_1A and a third-second tooth 1133_2A. The third-first tooth 1133_1A may protrude from one region of the first extension portion 1134A. The third-second tooth 1133_2A may protrude from another region of the first extension portion 1134A. In this case, the third-first tooth 1133_1A and the third-second tooth 1133_2A may be disposed apart from each other to form a groove 1133_3A. The groove 1133_3A may be formed as a concave surface on the tip surface of the third tooth 1133A. Alternatively, the 3-1 tooth 1133_1A and the 3-2 tooth 1133_2A may be spaced apart to form a hole 1133_3A. The hole 1133_3A may be formed penetrating the inner and outer surfaces of the tooth. Although the groove 1133_3A and the hole 1133_3A have been described separately, they may be the same as those shown in the drawings. The 3-1 tooth 1133_1A and the 3-2 tooth 1133_2A may have the same shape. The 3-1 tooth 1133_1A and the 3-2 tooth 1133_2A may each have a shape that is wide at the bottom and narrow at the top. For example, the 3-1 tooth 1133_1A and the 3-2 tooth 1133_2A may each have a trapezoidal shape that becomes wider toward the first extension portion 1134A.

[0185] FIG. 35 is a diagram showing a first stator tooth and a second stator tooth according to a second modified example, and FIG. 36 is a diagram showing the first stator tooth shown in FIG.

[0186] 35 and 36, the first stator tooth 1130B according to the second modified example may include a first body 1131B, a first tooth 1132B, a third tooth 1133B, and a first extension 1134B. The first stator tooth 1130B may have a first region J1 and a second region J2 arranged alternately along the circumferential direction. The first region J1 is a region where the first extension 1134B is arranged between the first tooth 1132B and the first tooth 1132B in the circumferential direction. And the second region J2 is a region where the first extension 1134B is not arranged between the first tooth 1132B and the first tooth 1132B in the circumferential direction. The first stator tooth 1130B includes a third tooth 1133B, and the third tooth 1133B protrudes from the first extension 1134B. The third tooth 1133B may be disposed to overlap the magnet 1230 in the radial direction.

[0187] The first stator tooth 1130B according to the second modified example has fewer first extension portions 1134B and third teeth 1133B than the first stator tooth 1130A according to the first modified example, which has the advantage of reducing the amount of material required to manufacture the stator tooth and improving assembly to the stator body 120.

[0188] FIG. 37 is a diagram showing a first stator tooth and a second stator tooth according to a third modified example, and FIG. 38 is a diagram showing the second stator tooth shown in FIG.

[0189] 37 and 38, the second stator tooth 1140C according to the third modified example may be a combination of a plurality of pieces. For example, the second stator tooth 1140C may include a 2-1 stator tooth 1140C1 including a portion of the plurality of second teeth 1142C and a 2-2 stator tooth 1140C2 including the remaining portion of the plurality of second teeth 1142C, and the 2-1 stator tooth 1140C1 and the 2-2 stator tooth 1140C2 may be disposed apart from each other. The second stator tooth 1140C according to the third modified example has an advantage that it is easy to manufacture because of its relatively simple shape, the amount of material required to manufacture the stator tooth can be reduced by reducing the generation of scrap, and the assembly to the stator body 1120 can be improved.

[0190] FIG. 39 is a diagram showing a first stator tooth and a second stator tooth according to a fourth modified example, and FIG. 40 is a diagram showing the first stator tooth shown in FIG.

[0191] 39 and 40, the first stator tooth 1130D may include a first body 1131D, a first tooth 1132D, a second tooth 1133D, and a first extension 1134D. The first stator tooth 1130D may also include a second extension 1135 extending from the first extension 1134D. The second extension 1135 may be bent at the first extension 1134D and overlapped with the first body 1131D in the radial direction. That is, the second extension 1135 is not disposed facing the magnet 1230 in the radial direction. The first stator tooth 1130D according to the third modified example has an advantage that the area of ​​the entire stator tooth is small, so that the amount of material for manufacturing the stator tooth can be reduced and interference with the magnet 1230 can be greatly reduced. In addition, the assembly with the stator body 120 is improved.

[0192] FIG. 41 is a perspective view showing the sensor 2500, the connector pin 2600, and the plate 2900.

[0193] 41, the sensor 2500 is connected to the plate 2900 by welding. The connector pin 2600 is connected to the plate 2900 by welding. The plate 2900 may be made of a conductive material such as copper. There may be a plurality of plates 2900. The plurality of plates 2900 may be arranged on the same plane. And, the plurality of plates 2900 may be arranged spaced apart from each other. The sensor 2500 is connected to the plate 2900 in an upright form. The connector pin 2600 is also connected to the plate 2900 in an upright form.

[0194] Plate 2900 may include a first surface 2901, a second surface 2902, and a third surface 2903. First surface 2901 and second surface 2902 are disposed opposite each other. Third surface 2903 is a surface connecting first surface 2901 and second surface 2902. When plate 2900 is a plate-shaped member, first surface 2901 corresponds to one surface of plate 2900, second surface 2902 corresponds to the other surface of plate 2900, and third surface 2903 corresponds to a side surface of plate 2900.

[0195] FIG. 42 is a top view of the sensor 2500, connector pin 2600, and plate 2900 shown in FIG.

[0196] 41 and 42, the sensor 2500 may include a first sensor 2510 and a second sensor 2520. The plate 2900 may include a first plate 2900A and a second plate 2900B. The first plate 2900A electrically connects the first sensor 2510 to the connector pin 2600. The second plate 2900B electrically connects the second sensor 2520 to the connector pin 2600. The third plate 2900C connects the first sensor 2510 to the second sensor 2520. And, the third plate 2900C electrically connects the first sensor 2510 and the second sensor 2520 to the connector pin 2600.

[0197] A first surface 2901 of the first plate 2900A, a first surface 2901 of the second plate 2900B, and a first surface 2901 of the third plate 2900C may be disposed on the same plane. And, a second surface 2902 of the first plate 2900A, a second surface 2902 of the second plate 2900B, and a second surface 2902 of the third plate 2900C may be disposed on the same plane.

[0198] 43 is a cross-sectional side view of the plate 2900 taken along line AA in FIG. 42, and FIG. 44 is a cross-sectional side view of the plate 2900 taken along line BB in FIG.

[0199] 42 to 44, a first surface 2901 and a second surface 2902 of the plate 2900 contact the housing 2700. A third surface 2903 of the plate 2900 also contacts the housing 2700. The housing 2700 may include a partition 2750 disposed between adjacent plates 2900. The partition 2750 may maintain a space between the adjacent plates 2900 and insulate the adjacent plates 2900 from each other.

[0200] The partition 2750 may include a first partition 2751 and a second partition 2752. The first partition 2751 may be disposed along a first direction. The second partition 2752 may be disposed by being bent from the first partition 2751 along a second direction different from the first direction. For example, the second partition 2752 may be connected vertically to the first partition 2751.

[0201] The plate 2900 and the housing 2700 may be formed by integrally molding the sensor 2500, the connector pin 2600, and the plate 2900 together with the housing 2700 through injection molding.

[0202] FIG. 45 is a perspective view showing the first collector, FIG. 46 is a perspective view showing the second collector, and FIG. 47 is an enlarged view showing one end and the other end of the collector.

[0203] The first collector 3810 and the second collector 3820 may each include an extension 3811, 3821, a first body 3812, 3822, and a second body 3813, 3823. The first body 3812, 3822 and the second body 3813, 3823 are disposed facing the first sensor 3500, respectively. The second body 3813, 3823 may be extended from the first body 3812, 3822. The extension 3811, 3821 may be extended from the first body 3812, 3822 and the second body 3813, 3823, respectively.

[0204] The first bodies 3812, 3822 and the second bodies 3813, 3823 may each include a flat surface, and the extensions 3811, 3821 may include a curved surface.

[0205] Collector 3800 may be manufactured by a forming method rather than a drawing method. In collector 3800 manufactured by the forming method, one end 3801 and the other end 3802 are in contact with each other and connected. Since collector 3800 is manufactured by the forming method, the number of post-processing steps can be significantly reduced and the material of collector 3800 can be significantly reduced. In addition, unlike the drawing method, collector 3800 manufactured by the forming method has the advantage that mass production is possible.

[0206] One end 3801 and the other end 3802 of the collector 3800 may be arranged to overlap in a first direction or a second direction. The collector 3800 may be implemented in various modified forms depending on the orientation of the first direction and the second direction. Hereinafter, the one end 3801 and the other end 3802 of the collector 3800 both correspond to a first collector 3810 and a second collector 3820.

[0207] In collector 3800 according to the modified example, the first direction may correspond to the width direction of collector 3800, and the second direction may correspond to the circumferential direction of collector 3800. One side end 3801 and the other side end 3802 of collector 3800 may be arranged to form an overlap region O31 along the width direction of collector 3800. Also, one side end 3801 and the other side end 3802 of collector 3800 may be arranged to form an overlap region O32 along the circumferential direction of collector 3800.

[0208] For example, collector 3800 may include a protrusion 3803 protruding from the other end 3802. Collector 3800 may include a groove 3804 formed as a concave surface at one end 3801 in which protrusion 3803 is disposed. Protrusion 3803 protrudes in the circumferential direction of collector 3800 and is positioned in groove 3804. In this case, protrusion 3803 may include one region having a width greater than the width of a portion of protrusion 3803 connected to other end 3802. This is to prevent protrusion 3803 from slipping out of groove 3804 in the circumferential direction of collector 3800.

[0209] For example, protrusion 3803 may have a wedge shape in which the width of the portion connected to other end 3802 is narrowed. Due to such a structure of protrusion 3803 and groove 3804, one end 3801 and other end 3802 are fixed not only in the width direction but also in the circumferential direction without being separated.

[0210] The one side end 3801 and the other side end 3802 may be coupled by caulking in a radial direction in a separated state so that the protrusion 3803 engages with the groove 3804. In this case, the one side end 3801 and the other side end 3802 may include a curved surface.

[0211] Meanwhile, the collector 3800 may be divided into a first region A31 including a flat surface and a second region A32 including a curved surface. The first region A31 may correspond to the bodies 3812, 3813, 3822, and 3823 of the collector 3800, and the second region A32 may correspond to the extensions 3811 and 3821 of the collector 3800. The width K31 of the one end 3801 and the width K31 of the other end 3802 may be greater than the width K32 of the first region A31 and the width K32 of the second region A32. Therefore, the one end 3801 and the other end 3802 may protrude from the first region A31 and the second region A32 in the width direction of the collector 3800. Such protruding regions of the one end 3801 and the other end 3802 may increase the bonding force between the housing 3700 and the collector 3800.

[0212] FIG. 48 is a view showing one end and the other end of a collector according to another modified example.

[0213] 48, in a collector 3800 according to another modification, the first direction may correspond to a radial direction of the collector 3800. One side end 3801 and the other side end 3802 of the collector 3800 may be arranged to form an overlap region O33 along the radial direction of the collector 3800. The one side end 3801 and the other side end 3802 may each be flat, which is advantageous for welding.

[0214] The collector 3800 may be divided into a third region A33 and a fourth region A34 according to the thickness. A thickness t32 of the fourth region A34 is greater than a thickness t31 of the third region A33. The fourth region A34 corresponds to an overlap region O33 of one end 3801 and the other end 3802 in the radial direction. The one end 3801 and the other end 3802 of the collector 3800 may be welded to each other in a state in which the one end 3801 and the other end 3802 are in contact with each other, so that the collector 3800 may be connected in a ring shape.

[0215] FIG. 49 is a view showing one end and the other end of a collector according to still another modified example.

[0216] 49, in a collector 3800 according to another modified example, the first direction may correspond to a radial direction of the collector 3800. One end 3801 of the collector 3800 may include a fifth region A35 and a sixth region A36 arranged to overlap in the radial direction of the collector 3800. And, the other end 3802 of the collector 3800 may include a seventh region A37 and an eighth region A38 arranged to overlap in the radial direction of the collector 3800.

[0217] At this time, one side end portion 3801 and the other side end portion 3802 may be alternately arranged in the radial direction. For example, the fifth region A35, the seventh region A37, the sixth region A36, and the eighth region A38 may be arranged in this order from the outside based on the radial direction.

[0218] The collector 3800 may be realized through a seaming process in which one end 3801 and the other end 3802 are joined by folding and bending. At this time, the one end 3801 and the other end 3802 have a locking structure for locking with each other. The one end 3801 and the other end 3802 are bound together through the locking structure, so that the collector 3800 can be connected in a ring shape.

[0219] FIG. 50 is a diagram showing the directionality of an external magnetic field with respect to the stator teeth 130, 140, and FIG. 51 is a diagram showing the avoidance state of the sensor 500 with respect to an external magnetic field having a z-axis direction.

[0220] Referring to FIG. 50, an external magnetic field has a large effect on the sensing device in the y'-axis direction, which is perpendicular to the axial z-axis direction.

[0221] 52, the sensor 500 of the sensing device according to the embodiment is disposed standing in the z-axis direction. Therefore, the area of ​​the sensor 500 as viewed from the z-axis is much smaller than the area of ​​the sensor 500 as viewed from the y'-axis. Therefore, the sensing device according to the embodiment has an advantage that the influence of an external magnetic field on the sensor 500 is small based on the z-axis direction.

[0222] 50 and 51, an external magnetic field in the y'-axis direction can have a large effect on the sensor 500 when the sensor 500 is standing in the z-axis direction. However, the external magnetic field in the y'-axis direction is induced along the first stator teeth 130 and the second stator teeth 140, and therefore flows without affecting the sensor 500. Therefore, the sensing device according to the embodiment has an advantage that the external magnetic field has a small effect on the sensor 500 even when the y'-axis direction is used as a reference.

[0223] FIG. 52 is a graph comparing the comparative example and the embodiment with respect to the amount of angular change corresponding to an external magnetic field in the z-axis direction.

[0224] Referring to Figure 52, in the comparative example of Figure 52, the stator teeth 130, 140 are arranged vertically and the sensor 500 is arranged horizontally, and it can be seen that as the external magnetic field in the z-axis direction increases, the amount of angular change increases linearly, and the measurement angle changes significantly depending on the external magnetic field.

[0225] On the other hand, in the case of the embodiment, even if the external magnetic field in the z-axis direction increases, there is almost no change in the angle, and it is understood that there is no effect from the external magnetic field.

[0226] FIG. 53 is a graph comparing the comparative example and the embodiment with respect to the amount of change in angle corresponding to an external magnetic field in the y'-axis direction.

[0227] Referring to Figure 53, in the comparative example of Figure 53, the first and second stator teeth 130, 140 are arranged vertically and the sensor 500 is arranged horizontally, and it can be seen that as the external magnetic field in the y'-axis direction increases, the amount of angular change increases linearly, and the measurement angle changes significantly depending on the external magnetic field.

[0228] On the other hand, in the case of the embodiment, even if the external magnetic field in the y'-axis direction increases, there is almost no change in the angle, and it is understood that there is no effect from the external magnetic field.

[0229] The present invention can be used in a variety of devices such as vehicles and home appliances.

Claims

1. stator; and A rotor including a magnet is included. the stator includes first stator teeth, second stator teeth, and a collector disposed between the first stator teeth and the second stator teeth; and a sensor disposed in correspondence with the collector; the collector includes a first collector and a second collector, the first collector includes a first region including a flat surface and a second region including a curved surface; the second collector includes a third region including a flat surface and a fourth region including a curved surface; the first region and the third region are arranged to correspond to each other, the first region includes a first plane and a second plane, the third region includes a third plane and a fourth plane, The first plane and the second plane are disposed at an angle to each other, the third plane and the fourth plane are disposed at an angle to each other; The sensors are disposed between the first plane and the second plane, and between the third plane and the fourth plane, the second region and the fourth region each include a protrusion; A sensing device, wherein the protrusion extends from a lower end of the second region or a lower end of the fourth region.

2. The sensing device of claim 1 , wherein the first collector and the second collector have different lengths.

3. The sensing device according to claim 1 , wherein the first region and the third region are parallel to each other.

4. the first stator teeth are arranged to overlap the second stator teeth in a radial direction from a center of the stator, the first stator teeth include a first body, a plurality of first teeth protruding from the first body, and a plurality of first extensions extending from the first body, The second stator teeth include a plurality of second teeth, one of the plurality of first teeth is disposed to overlap one of the plurality of second teeth in the radial direction, The sensing device according to claim 1 , wherein the first extension portion is disposed to overlap the magnet in an axial direction.

5. the first stator teeth include a third tooth, The sensing device according to claim 4 , wherein the third tooth protrudes from the first extension portion and is disposed to overlap the magnet in the radial direction.

6. Connector pin for connecting to external power supply; a plurality of plates electrically connecting said sensors and said connector pins; a housing in which the collector and the connector pins are disposed; The plate includes a first surface, a second surface, and a third surface that are positioned differently from one another, The sensing device according to claim 1 , wherein the first surface, the second surface, and the third surface are in contact with the housing.

7. Connector pin for connecting to external power supply; a plurality of plates electrically connecting said sensors and said connector pins; a housing in which the collector and the connector pins are disposed; The plurality of plates are spaced apart from one another, The sensing device of claim 1 , wherein the housing includes partitions disposed between adjacent plates.

8. The first surface and the second surface are disposed opposite to each other, The sensing device according to claim 6 , wherein the third surface connects the first surface and the second surface.

9. The collector is connected such that one end and the other end of the collector are in contact with each other. The sensing device according to claim 1 , wherein the one side end and the other side end are disposed to overlap each other in a first direction.

10. the first direction is a width direction of the collector, a protrusion protruding from the other end, The sensing device according to claim 9, further comprising a groove formed as a concave surface at the one side end and disposed on the protrusion.

11. The method of claim 1 further comprising: The sensing device according to claim 1 , wherein the housing includes a groove into which the protrusion is inserted.

12. A sensing device as described in claim 1, wherein the plane of the first region is positioned within an angle formed by both ends of the plane of the third region with respect to the center of the collector.

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