Eccentricity measurement system

Abstract

Eccentricity measuring system applied to a motor system comprising a stator and a rotor, and measuring the eccentricity of the rotor, wherein the eccentricity measuring system comprises: an eccentricity measuring sensor adapted to a pole shoe of the stator and configured to measure the presence or absence of rotor eccentricity by measuring a change in the magnetic field generated between the rotor and the stator; and a data acquisition port configured to transmit data acquisition information from the eccentricity measurement sensor to an external device, wherein an electrode pattern electrically connected to the eccentricity measurement sensor is inserted into the sensing port.

Description

Background of the Revelation; Area of ​​the Revelation

[0001] The present disclosure relates to an eccentricity measuring system and, in particular, to an eccentricity measuring system configured to measure an eccentricity occurring in a motor rotor, and to a method for manufacturing a motor system comprising this. Description of the related prior art

[0002] Reflective laser displacement sensors are widely used for measuring the rotor eccentricities of permanent magnet electric motors. This method measures changes in distance by directly irradiating a rotating shaft with laser beams. The method has the advantage of being intuitively understandable and applicable to various rotating devices. Furthermore, transmitted light micrometers or transmitted light 2D micrometers are also used in industrial settings.

[0003] However, if the outer diameter of a rotor core (other than the shaft) is to be measured when a reflective laser displacement sensor is applied to a permanent magnet electric motor according to the prior art, a sensor must be mounted outside the motor housing, and a surface of the rotor core must be illuminated with laser beams. Since the rotor core is obscured by a stator within the motor's structure, the laser beams cannot penetrate the core, and the measurement cannot be performed. In particular, there is a problem in that it is difficult to measure static eccentricity, as it is impossible to measure radial displacement at a single point.

[0004] For this reason, it is necessary to provide at least two or more sensors on two opposite sides, even if a section of the shaft is not covered by the stator core. In this case, the sensor can interfere with other external components, which limits the sensor mounting structure and increases the system's cost. State of the art document

[0005] [Patent document] Japanese patent no. 6441757 “Eccentricity Direction Detection Device and Variable Gap Motor” (“Device for detecting the eccentricity direction and motor with variable gap”) Summary of Revelation

[0006] The present disclosure is proposed to solve these problems and aims to provide an eccentricity measurement system comprising an eccentricity measurement sensor mounted in a motor and configured to measure tilting eccentricity, static eccentricity, and dynamic eccentricity of a rotor using a change in the magnetic field generated between the rotor and a stator, thereby overcoming a limitation of a prior art method using a reflective laser sensor, reducing costs compared to the prior art reflective laser sensor, detecting an eccentricity factor that most significantly affects the noise and vibration of a rotating device, detecting a defect at an early stage of mass production to prevent the shipment of potentially defective products, and measuring an eccentricity.which is caused by abrasion or similar after product durability tests or after prolonged operation of a vehicle, in order to detect a problem in advance and to take action in advance such as a repair, as well as a method for manufacturing an engine system that includes this.

[0007] With the eccentricity measurement system described above and the method for manufacturing the motor system that includes it, it is possible, if the eccentricity measurement system is applied to autonomous vehicles in the future, to monitor the mechanical condition of a rotary device, to apply the eccentricity measurement system to an intelligent rotary device system that is able to evaluate the condition of the same using a pre-secured defect level index, and to detect the condition of the rotary device in a range imperceptible to humans.Furthermore, the eccentricity measurement system can be applied in a case where it is difficult to detect the condition of an individual rotary device due to external vibration or noise, so that the eccentricity measurement system can be used to detect and address problems in an electric motor used in aircraft for urban air mobility (UAM).

[0008] To achieve the aforementioned objectives, an embodiment of the present disclosure provides an eccentricity measurement system applied to a motor system comprising a stator and a rotor, and measuring the eccentricity of the rotor, wherein the eccentricity measurement system comprises: an eccentricity measurement sensor adapted to a pole shoe of the stator and configured to measure the presence or absence of rotor eccentricity by measuring a change in the magnetic field generated between the rotor and the stator; and a sensing port configured to transmit sensing information from the eccentricity measurement sensor to the outside (e.g., to an external device), wherein an electrode pattern electrically connected to the eccentricity measurement sensor is inserted into the sensing port.

[0009] Furthermore, the eccentricity measuring sensor may comprise: a sensor housing comprising an insertion hole formed to be penetrating, such that the pole shoe of the stator is fitted into the insertion hole; a sensor coil wound around the sensor housing, arranged to extend along the outer circumferences of a surface of the pole shoe of the stator and a surface of the rotor facing each other, and configured to measure a change in the magnetic field generated between the rotor and the stator; and a pin coupled to the sensor housing, projecting from a surface of the sensor housing, electrically connected to the sensor coil, and configured to transmit a magnetic field signal from the sensor coil to the outside.

[0010] Furthermore, the sensor housing can include a coil body section which is a groove formed concavely along the outer circumferences of the surface of the stator pole shoe and the surface of the rotor facing each other, wherein the coil body section has a surface adjacent to the sensor coil, wherein a surface of the coil body section adjacent to the sensor coil can be formed such that it is round, and the coil body section can be formed such that a depth of a center based on a radial direction is deeper than a depth of an outer circumference based on the radial direction.

[0011] Furthermore, the sensor housing may include a protruding section extending from the insertion hole towards the pole shoe of the stator, with a protruding surface adjacent to the pole shoe of the stator.

[0012] Furthermore, a surface of the foreground section adjacent to the stator can be formed such that it is inclined at a predetermined angle without being perpendicular or parallel to a circumferential direction.

[0013] Furthermore, the preceding section may include a sensor recess groove formed concavely at a position spaced inwards at a predetermined distance from the surface adjacent to the pole shoe of the stator.

[0014] Furthermore, the foregoing section can be formed at a position spaced from a distal end of the insertion hole based on an axial direction at a predetermined distance in the axial direction.

[0015] Furthermore, the foregoing section can be provided as two or more foregoing sections formed in an axial direction and spaced apart from each other at predetermined intervals in the axial direction.

[0016] Furthermore, the sensing terminal can comprise a mounting housing made of an insulating material and formed by overmolding with an electrode pattern electrically connected to the eccentricity measuring sensor, and the mounting housing can comprise: an annular section formed in a ring shape along a circumferential edge of the stator; a connecting section extending in a radial direction from the annular section towards the eccentricity measuring sensor; and an external terminal into which the electrode pattern is inserted and an electrode of an external component is inserted.

[0017] Furthermore, the mounting housing may include a connection hole formed by a surface adjacent to the eccentricity measuring sensor, wherein the pin may be fitted and soldered into the connection hole, and the electrode pattern may electrically connect the pin and the external connection.

[0018] Furthermore, the mounting housing can include a plurality of housing recess grooves, each having a surface adjacent to an axial distal end face of the stator and formed concavely from a surface of the mounting housing.

[0019] Furthermore, the mounting housing may also include through holes formed by the ring section, and at least one of the through holes may be positioned in a location that intersects the ring section and the connecting section or the external connection.

[0020] Furthermore, the mounting housing may also include coupling sections that are coupled to the stator and configured to fix a position of the stator, wherein the coupling sections may be provided individually on two opposite circumferential sides of a support provided on an outer surface of the stator, and may surround and support the two opposite circumferential sides of the support, and a surface of the coupling section adjacent to the support may include an insertion groove into which the support is inserted.

[0021] Furthermore, the mounting housing may include coil protection sections designed to abut surfaces of stator teeth, extending radially from the ring section and formed in shapes corresponding to spaces between motor coils and the stator.

[0022] Furthermore, the eccentricity measuring sensor can be provided as two or more eccentricity measuring sensors arranged in the stator, and the respective eccentricity measuring sensors can be arranged so that they are spaced equally apart from each other.

[0023] Furthermore, the eccentricity measuring sensor can be provided as two or more eccentricity measuring sensors arranged in the stator and positioned so that they are spaced apart from each other while having a phase difference of 90 degrees.

[0024] Furthermore, a method for manufacturing a motor system that includes the eccentricity measuring system may include: step (a) manufacturing a sensor housing comprising an insertion hole and a coil former section and having an inserted pin; step (b) winding a sensor coil around the coil former section; step (c) connecting and electrically connecting the pin and the sensor coil; and step (d) mounting the sensor housing to the stator by fitting the pole shoe of the stator into the insertion hole. Brief description of the drawings Fig. Figure 1 is an overall perspective view showing a stator to which an eccentricity measurement system of the present disclosure is applied. Fig. Figure 2 is an overall perspective view showing the eccentricity measurement system of the present disclosure. Fig. Figure 3 is a partial front view showing pins and sensor coils of an eccentricity measuring sensor of the present disclosure. Fig. Figure 4 is a top view showing the eccentricity measuring sensor of the present disclosure. Fig. Figure 5 is a cross-sectional view showing a stator pole shoe to which the eccentricity measuring sensor of the present disclosure is applied. Fig. Figure 6 is a partial cross-sectional view showing a forward section of the eccentricity measuring sensor of the present disclosure. Fig. Figure 7 is a partial front view showing the preceding section of the eccentricity measurement sensor of the present disclosure. Fig. Figure 8 is a partial front view showing an embodiment of the preceding section of the eccentricity measuring sensor of the present disclosure. Fig. Figure 9 is an overall perspective view of an assembly housing of the present disclosure. Fig. Figure 10 is a partial perspective view of the assembly housing of the present disclosure. Fig. Figure 11 is a partial perspective view showing a coupling relationship between a detection port and the eccentricity measurement sensor of the present disclosure. Fig. Figure 12 is a partial top view showing a housing recess groove of the present disclosure. Fig. Figure 13 is a partial perspective view showing a coupling section of the present disclosure. Fig. 14 and Fig. Figure 15 are partial perspective views showing coil protection sections of the present disclosure. Fig. Figures 16 to 18 are schematic views showing embodiments of an arrangement of the eccentricity measuring sensor of the present disclosure. Fig. Figure 19 is a flowchart showing a method for manufacturing the eccentricity measuring system and a motor system comprising it, as disclosed herein. Fig. 20 and Fig. Figure 21 shows schematic views illustrating a positional relationship between a rotor and the eccentricity measuring sensor in the case of tilting eccentricity. Fig. Figure 22 is a schematic view showing a positional relationship between the rotor and the eccentricity measuring sensor in the case of a static eccentricity. Fig. Figure 23 is a schematic view showing a positional relationship between the rotor and the eccentricity measuring sensor in the case of dynamic eccentricity. Fig. 24 and Fig. Figure 25 are schematic views showing graphs of magnetic flux magnitudes measured by two eccentricity measurement sensors in the case of a tilting eccentricity. Fig. Figure 26 is a schematic view showing graphs of the magnetic flux amounts measured by the two eccentricity measurement sensors in the case of static eccentricity. Fig. Figure 27 is a schematic view showing graphs of the magnetic flux amounts measured by the two eccentricity measurement sensors in the case of dynamic eccentricity. Detailed description of the revelation

[0025] The technical teaching of the present disclosure is described in more detail below with reference to the accompanying drawings. Furthermore, terms or words used in the description and claims should not be interpreted as being limited to a general or lexical meaning, but should be interpreted as having a meaning and a concept that corresponds to the technical teaching of the present disclosure, based on the principle that an inventor can adequately define a concept of a term in order to describe his own disclosure by the best possible means.

[0026] The following describes a basic configuration of an eccentricity measurement system 1000 of the present disclosure with reference to Fig. 1 and Fig. 2 described.

[0027] The eccentricity measuring system 1000 of the present disclosure can be applied to a motor system comprising a stator S and a rotor R, and can measure the eccentricity of the rotor R. As described in Fig. 1 and Fig. As shown in Figure 2, the eccentricity measurement system can comprise 1000 eccentricity sensors 100 and a sensing port 200. The eccentricity sensors 100 can be fitted to pole shoes S1 of the stator S and measure the presence or absence of eccentricity of the rotor R by generating induced electromotive forces in sensor coils 120 by means of a change in the magnetic field generated between the rotor R and the stator S. More precisely, the eccentricity sensor can be a magnetic flux sensor provided such that one surface of it faces the rotor R, and the eccentricity sensor can measure a change in magnetic flux in a region that includes an upper end R1 and a lower end R2 of the rotor R based on an axial direction.

[0028] Furthermore, the sensing port 200 can transmit sensing information from the eccentricity sensor 100 to an external device (e.g., to an external device). In this case, the eccentricity sensor 100, the sensing port 200, and a pre-existing connection assembly can be connected by soldering. Additionally, the sensing port 200 can be formed in a ring shape along an outer circumferential edge of the stator S. Therefore, motor coils C wound around the sensing port 200 and the stator S may not interfere with each other. Because the sensing port 200 is included, measurement information obtained by the eccentricity sensor 100 can be easily transmitted externally.Therefore, an induced electromotive force signal generated in the sensor coils 120 and transmitted externally can be analyzed, and the presence or absence of rotor eccentricity R can be detected.

[0029] The eccentricity measuring sensor 100 of the present disclosure will be described in more detail below with reference to Fig. 3 to 8 described.

[0030] As in Fig. As shown in Figure 3, the eccentricity measuring sensor 100 of the present disclosure can be applied to the motor system comprising the stator S and the rotor R, and measure the eccentricity of the rotor R. The eccentricity measuring sensor 100 can be adapted to and fixed on the pole shoe S1 of the stator S. More precisely, the eccentricity measuring sensor 100 can comprise a sensor housing 110 having an insertion hole 111 that is formed to penetrate, such that the pole shoe S1 of the stator is fitted into the insertion hole 111. More precisely, the sensor housing 110 of the eccentricity measuring sensor 100 can be coupled to the pole shoe S1 of the stator in a radial direction and fitted radially within the stator S with the pole shoe S1 of the stator.The insertion hole 111 can be formed in a shape identical to the shape of a surface perpendicular to the radial direction of the pole shoe S1 of the stator, and the sensor housing 110 can be formed in a square ring shape along an edge of the surface perpendicular to the radial direction of the pole shoe S1 of the stator. The eccentricity measuring sensor 100 can be inserted into a motor housing as described above, thereby minimizing interference with other components.

[0031] Furthermore, the eccentricity measuring sensor 100 of the present disclosure can comprise the sensor coils 120 and pins 130. The sensor coil 120 can be wound around the sensor housing 110, and a change in the magnetic field generated between the rotor R and the stator S can generate an induced electromotive force in the sensor coil 120. More precisely, the sensor coils 120 can be arranged to extend along the outer circumferences of a surface of the pole shoe S1 of the stator and a surface of the rotor R facing each other.Therefore, the sensor coil 120 can generate an induced current by a change in the magnetic field generated in a direction perpendicular to a surface of the pole shoe S1 of the stator facing a side face of the rotor R, and the eccentricity measuring sensor 100 can consistently measure a change in the induced electromotive force by magnetic induction through a change in the magnetic field generated in all areas above the upper end R1 and the lower end R2 of the rotor (based on the axial direction), thereby measuring tilting eccentricity, static eccentricity, and dynamic eccentricity. Furthermore, the pins 130 can be coupled to the sensor housing 110, project from a surface of the sensor housing 110, be electrically connected to the sensor coil 120, and transmit a magnetic field signal from the sensor coil 120 to the outside.Therefore, an induced electromotive force signal generated in the sensor coils 120 and transmitted externally can be analyzed, and the presence or absence of rotor eccentricity R can be detected.

[0032] Furthermore, as in Fig. As shown in Figure 4, the sensor housing 110 comprises a coil former section 112, which is a groove formed concavely along the outer circumferences of the surface of the pole shoe S1 of the stator S and the surface of the rotor R, facing each other. The coil former section 112 has a surface adjacent to the sensor coil 120. The coil former section 112 can be shaped such that the depth of its center, based on the radial direction, is deeper than the depth of its outer circumference, also based on the radial direction. For example, the surface adjacent to the sensor coil 120 can be shaped to be round (a "U" shape) or V-shaped. Therefore, the sensor coil 120, wound around the coil former section 112, can be positioned at the center of the coil former section 112, i.e., at its center based on the radial direction.Therefore, even if the motor housing and stator S vibrate, the sensor coil 120 will not disconnect, and a position of the sensor coil 120 can be kept constant, thus improving the accuracy in eccentricity measurement.

[0033] As in Fig. As shown in Figure 5, the sensor housing 110 can include projecting sections 113 extending from the insertion hole 111 towards the pole shoe S1 of the stator and having projecting surfaces adjacent to the pole shoe S1 of the stator. Because the projecting section 113 is included, the eccentricity measuring sensor 100 can be fixed to a radial distal end of the pole shoe S1 of the stator. In this case, the projecting sections 113 can be formed at positions spaced axially from the distal end of the insertion hole 111 at predetermined intervals. As shown in Figure 5, the sensor housing 110 can be formed at predetermined intervals in the axial direction. Fig. As shown in Figure 5, a surface of the protruding section adjacent to the stator S can be formed such that it is inclined at a predetermined angle without being perpendicular or parallel to any circumferential direction. That is, the surface of the protruding section adjacent to the stator can be formed as an inclined surface (undercut structure). Therefore, it is possible to increase the frictional force between the protruding section 113 and the pole shoe S1 of the stator and to prevent the eccentricity measuring sensor 100 from separating from the pole shoe S1 of the stator. Furthermore, as shown in Fig. As shown in Figure 6, the preceding section 113 includes a sensor recess groove 113a, which is formed concavely at a position spaced inwards at a predetermined distance from the surface adjacent to the pole shoe S1 of the stator. Because the sensor recess groove 113a is included, the undercut structure, in which a surface is formed inclined identically to the stator S, can be formed more smoothly, as described above. In this case, as shown in Fig. As shown in Figure 7, the foregoing section 113 is formed at a position spaced a predetermined gap g from the distal end of the insertion hole 111 based on the axial direction, so that the sensor recess groove 113a and the undercut structure can be machined more easily.

[0034] Furthermore, as in Fig. As shown in Figure 8, the preceding section 113 can be provided as two or more preceding sections 113 formed in the axial direction and spaced apart from each other at predetermined intervals in the axial direction. Therefore, it is possible to reduce the area in which the preceding section 113 and the pole shoe S1 of the stator are in contact with each other. This makes it possible to improve handling during an assembly process. That is, because the preceding section 113 is formed, coupling properties between the eccentricity measuring sensor 100 and the pole shoe S1 of the stator can be improved. The preceding section 113 can be applied only to a portion of a side surface of the insertion hole 111, instead of being applied to the entire side surface of the insertion hole 111, thereby improving handling during the assembly process.

[0035] The following section describes in more detail the detection port 200 of the present disclosure and a coupling relationship between the detection port 200 and the eccentricity measuring sensor 100 with reference to Fig. 9 to 15 described.

[0036] As in Fig. As shown in Figure 9, the sensing terminal 200 can include a mounting housing 220 made of an insulating material and formed by overmolding with an electrode pattern 210 that is electrically connected to the eccentricity measuring sensor 100. More precisely, the mounting housing 220 can be an injection-molded plastic product. The electrode pattern 210, which is a conductor before injection molding, can be inserted into a mold, and the mounting housing 220 can be formed together with the electrode pattern 210. The electrode pattern 210 can be produced by punching a copper plate using a press. Since the mounting housing 220 is included, the electrode pattern 210 can be mounted and fixed on the stator S.Furthermore, the mounting housing 220 can include an annular section 221, which is formed in a ring shape along a circumferential edge of the stator S, connecting sections 222, which extend radially from the annular section 221 towards the eccentricity measuring sensor 100, and an external connection 223 into which the electrode pattern 210 is inserted and an electrode of an external component is inserted. The external connection 223 can be configured to extend radially outwards from the annular section 221.

[0037] In this case, as in Fig. As shown in Figure 10, a distal end of the electrode pattern 210 extends to the outside of the external port 223. When a connector or similar device is connected to the external port 223, the connector and the electrode pattern 210 can be electrically connected. Furthermore, the connecting section 222 can be connected to a tooth S2 of the stator S such that one surface of the connecting section 222 abuts the tooth S2 of the stator S, allowing one end of the connecting section 222 to be coupled to the eccentricity sensor 100 and the other end of the connecting section 222 to be connected to the ring section 221. In this case, one end of the connecting section 222 can abut the eccentricity sensor 100, and a groove can be formed concavely so that the eccentricity sensor 100 can be fitted into the groove.

[0038] Furthermore, as in Fig. As shown in Figure 11, the pins 130 of the eccentricity measuring sensor 100 extend towards the sensing terminal 200, and the mounting housing 220 can include connecting holes 224 into which the pins 130 are fitted and soldered. The connecting hole 224 can be formed by a surface adjacent to the eccentricity measuring sensor 100, i.e., a surface of a groove formed such that the eccentricity measuring sensor 100 fits into the groove. The electrode pattern 210 can extend from the connecting hole 224 to which the pin 130 is soldered, and the electrode pattern 210 can electrically connect the pin 130 and the external terminal 223. Essentially, the electrode pattern 210 can be provided in a state in which the electrode pattern 210 is fully inserted into the mounting housing 220.However, the electrode pattern 210 can have a shape that is open outwards on one side at the connection hole 224 and in an area adjacent to the connection hole 224. Therefore, the pin 130 and the electrode pattern 210 can be soldered smoothly.

[0039] Furthermore, the mounting housing 220 can also include through holes 226 formed by the annular section 221. At least one of the through holes 226 can be formed at a position that intersects the annular section 221 and the connecting section 222 or the external terminal 223. The through hole 226 can be a trace of a stepped section provided in a mold and configured to support a position of the electrode pattern 210. That is, the mounting housing 220 can be produced by injection molding in a state where a stepped section for supporting the position of the electrode pattern 210 projects from the mold.The reason the stepped section is formed at the point where the ring section 221 and the connecting section 222 intersect, or where the ring section 221 and the external terminal 223 intersect, is to more efficiently support the position of the electrode pattern 210, since the electrode pattern 210 is bent at this position. (The electrode pattern 210 extends circumferentially from the ring section 221, and the electrode pattern 210 extends radially from the connecting section 222 and the external terminal 223.)

[0040] Furthermore, as in Fig. Figure 12 shows that the mounting housing 220 comprises a plurality of housing recess grooves 225, each having a surface adjacent to an axial distal end face of the stator S and formed concavely from a surface of the mounting housing 220. The housing recess grooves 225 can be formed in the entirety of a surface of the mounting housing 220. Fig. Figure 12 shows the housing recess grooves 225 in a coupling section 227, which is described below. The housing recess grooves 225 can be formed such that a surface of the mounting housing 220 has a grid shape. Because the housing recess groove 225 is included, the overall weight of the sensing connector 200 can be reduced.

[0041] Furthermore, as in Fig. As shown in Figure 13, the mounting housing 220 further comprises the coupling sections 227, which are coupled to the stator S to fix the position of the stator S. More precisely, the coupling sections 227 can be provided individually on two opposite circumferential sides of a support S3, which is provided on an outer surface of the stator S, and the coupling sections 227 can surround and support the two opposite circumferential sides of the support S3. More precisely, a surface of the coupling sections adjacent to the support S3 can comprise an insertion groove 227a into which the support S3 is inserted. Any surface of the insertion groove 227a can adjoin a surface, i.e., a side face of the support S3 perpendicular to the radial direction of the motor, and another surface of the insertion groove 227a can adjoin a surface, i.e., a bottom face of the support S3 perpendicular to an axis of the motor.Since the coupling sections 227 are included with the above-mentioned shapes, it is possible to restrict movements of the sensing terminal 200 in different directions, thereby increasing the coupling strength between the stator S and the sensing terminal 200.

[0042] Furthermore, as in Fig. Figure 14 shows that the mounting housing 220 comprises coil protection sections 228 having surfaces designed to abut the teeth S2 of the stator S. The coil protection section 228 extends radially from the annular section 221, has a surface abutting the tooth S2 of the stator, and is formed in a shape corresponding to a space between the motor coil C and the stator S. For example, an axial distal end of the coil protection section 228 may be formed in an arc shape. Therefore, as shown in Fig. As shown in Figure 15, the coil protection sections 228 are positioned in the spaces between the motor coils C and the spaces between the motor coils C and the stator S, allowing the motor coils C to be extended appropriately along the axis of the stator S by an axial height of the coil protection section 228. Therefore, it is possible to minimize damage to the motor coils C between the motor coils C and the edges of the teeth S2 of the stator when the motor coils C are twisted for wiring.

[0043] Embodiments of an arrangement of the eccentricity measuring sensors 100 of the present disclosure are described in more detail below with reference to Fig. Described in sections 16 to 18.

[0044] As in Fig. 16 and Fig. As shown in Figure 17, two or more eccentricity measuring sensors 100 can be arranged in the stator S, and the respective eccentricity measuring sensors 100 can be arranged such that they are equidistant from one another. Since two or more eccentricity measuring sensors 100 are used, the eccentric state can be detected by comparing data between the sensors, in case it is difficult to detect reference data when no eccentricity is present. More precisely, as shown in Fig. Figure 16 shows that if three eccentricity measuring sensors 100 are used, the eccentricity measuring sensors 100 are positioned at positions with a phase difference of 120 degrees based on the stator S and the rotational axis of the rotor R. Alternatively, as shown in Fig. Figure 17 shows that if four eccentricity measuring sensors 100 are used, the eccentricity measuring sensors 100 can be positioned at positions with a phase difference of 90 degrees based on the stator S and the rotational axis of the rotor R. Similarly, if two eccentricity measuring sensors 100 are used, the eccentricity measuring sensors 100 can be positioned at positions with a phase difference of 180 degrees based on the stator S and the rotational axis of the rotor R.

[0045] Furthermore, as in Fig. Figure 18 shows that two or more eccentricity measuring sensors 100 are arranged in the stator S and are positioned such that they are spaced apart from each other while having a phase difference of 90 degrees. Therefore, the eccentric state can be detected by comparing data between the sensors, in case it is difficult to detect the reference data when no eccentricity is present.

[0046] A method for manufacturing the motor system comprising the eccentricity measuring sensor 100 of the present disclosure is described in more detail below with reference to Fig. 19 described.

[0047] As in Fig. As shown in Figure 19, the method for manufacturing the motor system comprising the eccentricity measuring sensor 100 of the present disclosure may include step (a) manufacturing the sensor housing 110, which comprises the insertion hole 111 and the coil body section 112 and has the inserted pin 130, step (b) winding the sensor coil 120 around the coil body section 112, step (c) connecting and electrically connecting the pin 130 and the sensor coil 120, and step (d) mounting the sensor housing 110 on the stator S by fitting the pole shoe S1 of the stator into the insertion hole 111.

[0048] More precisely, in step (a), the sensor housing 110 can be formed by injection molding, and the overmolding can be carried out in a state where the pin 130 is inserted into a mold. The pin 130 can be inserted into a surface provided for the surface of the sensor housing 110, in which the insertion hole 111 is formed. Furthermore, the pin 130 can be made of conductive copper and may be a copper alloy, as strength and rigidity are required for winding or subsequent external wiring. The pin 130 can have a cylindrical shape so that the sensor coil 120 can be easily wound around or attached to the pin 130. However, if the sensor coil 120 is a square coil, it can also have a square shape to facilitate connection handling.

[0049] Furthermore, in step (b), the sensor coil 120 can be wound around a groove formed in the coil body section 112. The sensor coil 120 can be a magnetic wire with an insulating coating on its surface. It can be a round or square wire. In addition, in step (c), the sensor coil 120 can be wound around an outer circumferential surface of the pin 130 and fixed to it. The sensor coil 120 can be a self-welding coil, thus facilitating its attachment to the pin 130. Alternatively, the sensor coil 120 and the pin 130 can be joined by soldering, arc welding, ultrasonic welding, resistance welding, or similar processes.

[0050] Furthermore, in step (d), the eccentricity measuring sensor 100 can be fixed to the tooth of the stator S in the radial direction at an inner diameter position of a core of the stator S. Subsequently, the stator S and the eccentricity measuring sensor 100 can be fixed using an impregnating fluid when the stator S is impregnated. In this case, the impregnating fluid can be allowed to flow to the coil former section 112 of the eccentricity measuring sensor 100, so that the sensor coil 120 wound around the coil former section 112 can also be fixed simultaneously. Therefore, the eccentricity measuring sensor 100 can be moved towards an outer diameter section and completely prevented from being separated from the pole shoe S1 of the stator, thus improving the accuracy of the eccentricity measurement.

[0051] Below, an algorithm for measuring the eccentricity of the rotor R using the eccentricity measuring sensor 100 of the present disclosure is described with reference to Fig. Described in sections 20 to 27.

[0052] As in Fig. As shown in Figure 20, if an eccentricity sensor 100 is used and the upper end R1 and the lower end R2 of the rotor are tilted in opposite (radial) directions to the same extent (tilting eccentricity case 1), the magnetic flux on the side near the eccentricity sensor 100 can increase, and the magnetic flux on the side furthest from the eccentricity sensor 100 can decrease. That is, the total magnetic flux can change.

[0053] More precisely, if there is an eccentricity in a left / right direction in Fig. 20 occurs, an aspect is measured in which the magnetic flux increases only at one end (R1) or the other at the lower end (R2) of the rotor R, and decreases at the other end (R1) or the other at the lower end (R2). That is, it can be determined that if the magnetic flux increases at the upper end (R1) of the rotor and decreases at the lower end (R2), the upper end (R1) of the rotor is inclined towards the eccentricity sensor (100). Conversely, it can be determined that the lower end (R2) of the rotor is inclined towards the eccentricity sensor (100).

[0054] Furthermore, if an eccentricity in an upward / downward direction is present in Fig. 20 occurs when both the upper end R1 and the lower end R2 of the rotor R are located away from the eccentricity measuring sensor 100, so that the magnetic flux values ​​can decrease at both the upper end R1 and the lower end R2 of the rotor R. Therefore, it can be determined that the eccentricity occurs in a direction perpendicular to the direction in which the rotor R faces the eccentricity measuring sensor 100.

[0055] As in Fig. As shown in Figure 21, if an eccentricity measuring sensor 100 is used and only one of the upper end R1 and the lower end R2 of the rotor R is tilted (tilting eccentricity case 2), the tilted side of the rotor R approaches or moves away from the eccentricity measuring sensor 100, so that the amount of magnetic flux can increase or decrease.

[0056] More precisely, if an eccentricity occurs, an aspect can be measured in which the magnetic flux increases or decreases at only one of the upper ends R1 or the lower end R2 of the rotor R, while the magnetic flux at the other end R1 or R2 remains constant. That is, it can be determined that if the magnetic flux at the upper end R1 of the rotor increases or decreases while the magnetic flux at the lower end R2 remains constant, then the upper end R1 of the rotor is tilted. Conversely, it can be determined that the lower end R2 of the rotor is tilted.

[0057] As in Fig. As shown in Figure 22, if an eccentricity sensor 100 is used and both the upper end R1 and the lower end R2 of the rotor R are constantly eccentric, i.e., if the rotor R is eccentric in the radial direction (static eccentricity), both the upper end R1 and the lower end R2 of the rotor R approach or move away from the eccentricity sensor 100 in the same way, so that the amount of magnetic flux can increase or decrease. That is, it can be determined that the rotor R is statically eccentric towards the eccentricity sensor 100 if the amounts of magnetic flux at the upper end R1 and at the lower end R2 of the rotor increase simultaneously in the same way, and that the rotor R is statically eccentric in a direction away from the eccentricity sensor 100 if the amounts of magnetic flux at the upper end R1 and at the lower end R2 of the rotor decrease simultaneously in the same way.

[0058] Furthermore, as in Fig. Figure 23 shows that if an eccentricity sensor 100 is used and the value of an air gap changes over time (dynamic eccentricity), the amount of magnetic flux measured by the rotor R can change over time, and the cycle of the magnetic flux can also change. More precisely, as the rotor R approaches the eccentricity sensor 100, the amount of magnetic flux can increase at the same time that the cycle of the magnetic flux decreases. As the rotor R moves away from the eccentricity sensor 100 in the opposite direction, the amount of magnetic flux can decrease at the same time that the cycle of the magnetic flux increases.

[0059] Furthermore, as in Fig. Figure 24 shows that if two eccentricity measuring sensors 100 are used and the upper and lower sides of the rotor R are tilted equally in opposite (radial) directions (tilting eccentricity case 1), the magnetic flux on the side near the eccentricity measuring sensor 100 increases, and the magnetic flux on the side furthest from the eccentricity measuring sensor 100 decreases. That is, the total magnetic flux can change.

[0060] For example, if a first eccentricity sensor 100A and a second eccentricity sensor 100B are arranged such that they are spaced apart from each other with a phase difference of 180 degrees, and the tilting eccentricity of the rotor R occurs at both the first eccentricity sensor 100A and the second eccentricity sensor 100B, the magnetic flux magnitude may decrease partially compared to a reference magnetic flux magnitude determined when no eccentricity occurs at either the first eccentricity sensor 100A or the second eccentricity sensor 100B. This represents an aspect where the magnetic flux magnitude decreases as the upper end R1 or the lower end R2 of the rotor R moves away from the first eccentricity sensor 100A and the second eccentricity sensor 100B.

[0061] Furthermore, as in Fig. Figure 25 shows that if two eccentricity measuring sensors 100 are used and only one is tilted from the upper end R1 and the lower end R2 of the rotor R (tilting eccentricity case 2), the magnetic flux amount on the side near the eccentricity measuring sensor 100 increases, the magnetic flux amount on the side furthest from the eccentricity measuring sensor 100 decreases, and the magnetic flux amount on another side remains constant.For example, if the first eccentricity measuring sensor 100A and the second eccentricity measuring sensor 100B are arranged such that they are spaced apart from each other with a phase difference of 180 degrees, and the eccentricity of the upper end R1 of the rotor occurs such that the upper end R1 of the rotor approaches the second eccentricity measuring sensor 100B, the magnetic flux magnitude at the first eccentricity measuring sensor 100A may be partially smaller than a reference value, and the magnetic flux magnitude at the second eccentricity measuring sensor 100B may be partially larger than the reference value.

[0062] Furthermore, as in Fig. Figure 26 shows that if two eccentricity measuring sensors 100 are used and both the upper end R1 and the lower end R2 of the rotor R are constantly eccentric, i.e., if the rotor R is eccentric in the radial direction (static eccentricity), both the upper end R1 and the lower end R2 of the rotor R move towards or away from the eccentricity measuring sensor 100 in the same way, so that the amount of magnetic flux can increase or decrease. That is, the amounts of magnetic flux at the upper end R1 and at the lower end R2 of the rotor can increase simultaneously in the same way.For example, if the first eccentricity measuring sensor 100A and the second eccentricity measuring sensor 100B are arranged so that they are spaced apart from each other with a phase difference of 180 degrees, and the eccentricity of the rotor occurs such that the rotor approaches the second eccentricity measuring sensor 100B, the magnetic flux magnitude at the first eccentricity measuring sensor 100A may become significantly smaller than a reference value, and the magnetic flux magnitude at the second eccentricity measuring sensor 100B may become significantly larger than the reference value.

[0063] Furthermore, as in Fig.Figure 27 shows that if two eccentricity sensors 100 are used and the value of an air gap changes over time (dynamic eccentricity), the amount of magnetic flux measured by the rotor R can change over time, and both the rotation angle and the amount of magnetic flux can change over time. For example, if the first eccentricity sensor 100A and the second eccentricity sensor 100B are arranged so that they are spaced apart from each other with a phase difference of 180 degrees, and dynamic eccentricity occurs in the rotor R, the graphs of the magnetic flux amounts of the first eccentricity sensor 100A and the second eccentricity sensor 100B can be formed in opposite directions and differ from the reference value in magnetic flux amount and cycle.

[0064] Furthermore, at least two or more of the tilting eccentricity, the static eccentricity, and the dynamic eccentricity can occur while superimposed on each other. In this case, the type of eccentricity can be analyzed by comparing each of the eccentricity data with the measured data.

[0065] According to the eccentricity measuring sensor and the method for manufacturing the motor system comprising it, as described above, the eccentricity measuring system can include the eccentricity measuring sensor mounted in the motor and configured to measure the tilting eccentricity, the static eccentricity, and the dynamic eccentricity of the rotor using a change in the magnetic field generated between the rotor and the stator, thereby overcoming a limitation of a prior art method using a reflective laser sensor, reducing costs compared to the prior art reflective laser sensor, detecting the eccentricity factor that most significantly affects noise and vibration of the rotating device, and detecting a defect at the initial stage of mass production to prevent the shipment of potentially defective products.An eccentricity is measured that is caused by abrasion or similar factors after product durability tests or after prolonged operation of the vehicle, in order to detect a problem in advance and take preventative action such as repair.

[0066] Furthermore, with the eccentricity measurement system described above, if applied to autonomous vehicles in the future, it will be possible to monitor the mechanical condition of the rotary device. This system can be applied to an intelligent rotary device system capable of evaluating its condition using a pre-defined defect level index, and detecting the condition of the rotary device in a range imperceptible to humans. Additionally, the eccentricity measurement system can be applied in situations where it is difficult to detect the condition of an individual rotary device due to external vibration or noise. Therefore, the system can be used to proactively detect and address problems in the electric motor used in urban air mobility (UAM) aircraft.

[0067] The technical teaching should not be interpreted as being limited to the embodiments of the present disclosure. Naturally, the scope of application is diverse, and various modifications and implementations can be made by those skilled in the field without departing from the subject matter of the present disclosure as claimed in the claims. Accordingly, these improvements and modifications fall within the scope of the present disclosure, provided they are obvious to those skilled in the field. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 6441757

[0005]

Claims

[1] Eccentricity measuring system applied to a motor system comprising a stator and a rotor, and measuring an eccentricity of the rotor, wherein the eccentricity measuring system comprises: an eccentricity measuring sensor adapted to a pole shoe of the stator and configured to measure the presence or absence of rotor eccentricity by measuring a change in the magnetic field generated between the rotor and the stator; and a data acquisition port configured to transmit data acquisition information from the eccentricity measurement sensor to an external device, wherein an electrode pattern electrically connected to the eccentricity measurement sensor is inserted into the sensing port. [2] Eccentricity measuring system according to claim 1, wherein the eccentricity measuring sensor comprises: a sensor housing comprising an insertion hole formed by the sensor housing so that the pole shoe of the stator is fitted into the insertion hole; a sensor coil wound around the sensor housing, arranged to extend along the outer circumferences of a surface of the stator pole shoe and a surface of the rotor facing each other, and configured to measure a change in the magnetic field generated between the rotor and the stator; and a pin that is coupled to the sensor housing, protrudes from a surface of the sensor housing, is electrically connected to the sensor coil and is configured to transmit a magnetic field signal from the sensor coil to the outside. [3] Eccentricity measuring system according to claim 2, wherein the sensor housing comprises a coil body section which is a groove which is concave along the outer circumferences of the surface of the pole shoe of the stator and the surface of the rotor which are facing each other, wherein the coil body section has a surface which adjoins the sensor coil, wherein a surface of the coil body section adjacent to the sensor coil is formed such that it is round, and wherein the coil body section is formed such that a depth of a center based on a radial direction is deeper than a depth of an outer circumference based on the radial direction. [4] Eccentricity measuring system according to claim 3, wherein the sensor housing comprises a projecting section extending from the insertion hole towards the pole shoe of the stator and having a projecting surface adjacent to the pole shoe of the stator. [5] Eccentricity measuring system according to claim 4, wherein a surface of the foregoing section adjacent to the stator is formed such that it is inclined at a predetermined angle without being perpendicular or parallel to a circumferential direction. [6] Eccentricity measuring system according to claim 5, wherein the preceding section comprises a sensor recess groove which is arranged concavely at a position which is spaced inwards at a predetermined distance from the surface which adjoins the pole shoe of the stator. [7] Eccentricity measuring system according to claim 6, wherein the foregoing section is arranged at a position spaced from a distal end of the insertion hole based on an axial direction at a predetermined distance in the axial direction. [8] Eccentricity measuring system according to one of claims 4 to 7, wherein the foregoing section is provided as two or more foregoing sections arranged in an axial direction and spaced apart from each other at predetermined intervals in the axial direction. [9] Eccentricity measurement system according to any one of claims 2 to 8, wherein the sensing port comprises a mounting housing made of an insulating material and formed by overmolding with an electrode pattern electrically connected to the eccentricity measurement sensor, and wherein the mounting housing comprises: a ring section formed in a ring shape along a circumferential edge of the stator; a connecting section extending in a radial direction from the ring section towards the eccentricity measuring sensor; and an external connection into which the electrode pattern is inserted and an electrode of an external component is inserted. [10] Eccentricity measuring system according to claim 9, wherein the mounting housing comprises a connecting hole formed by a surface adjacent to the eccentricity measuring sensor, the pin is fitted into the connecting hole and soldered in place, and the electrode pattern electrically connects the pen and the external connection. [11] Eccentricity measuring system according to claim 9 or 10, wherein the mounting housing comprises a plurality of housing recess grooves, each having a surface adjacent to an axial distal end face of the stator and formed concavely from a surface of the mounting housing. [12] Eccentricity measuring system according to one of claims 9 to 11, wherein the mounting housing further comprises through holes formed by the ring section, and wherein at least one of the through holes is positioned at a position that intersects the ring section and the connecting section or the external connection. [13] Eccentricity measuring system according to one of claims 9 to 12, wherein the mounting housing further comprises coupling sections which are coupled to the stator and are configured to fix a position of the stator, wherein the coupling sections are individually provided on two opposite circumferential sides of a bracket which is provided on an outer surface of the stator, and which surround and support the two opposite circumferential sides of the bracket, and wherein a surface of the coupling sections adjacent to the holder includes an insertion groove into which the holder is inserted. [14] Eccentricity measuring system according to any one of claims 9 to 13, wherein the mounting housing comprises coil protection sections which are configured to abut surfaces of teeth of the stator, extend in the radial direction from the ring section and are formed in shapes which correspond to spaces between motor coils and the stator. [15] Eccentricity measuring system according to one of claims 1 to 14, wherein the eccentricity measuring sensor is provided as two or more eccentricity measuring sensors arranged in the stator, and the eccentricity measuring sensors are arranged such that they are spaced apart from each other at equal intervals. [16] Eccentricity measuring system according to any one of claims 1 to 15, wherein the eccentricity measuring sensor is provided as two or more eccentricity measuring sensors arranged in the stator and arranged such that they are spaced apart from each other while having a phase difference of 90 degrees.

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