Eccentricity measurement system

Abstract

Eccentricity measuring system designed to be 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 element designed to detect the presence or absence of rotor eccentricity by measuring a change in the magnetic field generated between the rotor and the stator; and a sensor housing, comprising: a first surface in which the eccentricity measuring element is embedded, and a central hole through the center of the sensor housing, so that a rotating shaft of the rotor is fitted into the central hole, the first surface faces a distal end of the rotor.

Description

Background of Revelation; Technical Area of ​​Revelation

[0001] The present disclosure relates to an eccentricity measuring system and, in particular, to an eccentricity measuring system designed to measure the eccentricity occurring in a motor rotor. Description of the state of the art

[0002] Reflective laser displacement sensors are widely used for measuring the rotor eccentricity 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, transmissive micrometers or transmissive 2D micrometers are also used in industrial plants.

[0003] However, if the outer diameter of a rotor core is to be measured outside of a shaft, when a prior art reflective laser displacement sensor is applied to a permanent magnet electric motor, the 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 covered by a stator within the electric motor structure, the laser beams cannot penetrate the core, and the measurement cannot be performed. In particular, a problem arises from the difficulty of measuring 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 part of the shaft is not covered by the stator core. In this case, the sensor may interfere with other external components, which imposes a limitation on the sensor mounting structure and increases the system cost. [State of the art document]

[0005] (Patent document 1) Japanese patent specification no. 6441757 “Device for detecting the eccentricity direction and variable gap motor” (“Eccentricity Direction Detection Device and Variable Gap Motor”) 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 the total tilting eccentricity, static eccentricity, and dynamic eccentricity of a rotor by utilizing a change in the magnetic field generated between the rotor and a stator, thereby overcoming a limitation of a prior art reflective laser sensor method, 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 identify a problem in advance and to take preventative action such as repair.

[0007] 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 a rotary device, apply the eccentricity measurement system to an intelligent rotary device system capable of evaluating its condition using a pre-defined defect level index, and detect the condition of the rotary device in a range imperceptible to humans. Furthermore, the eccentricity measurement system can be applied in cases where it is difficult to detect the condition of an individual rotary device due to external vibrations or noise. This allows the eccentricity measurement system to be used to proactively detect and resolve 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 measuring system configured to be 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 element configured to measure the presence or absence of eccentricity of the rotor by measuring a change in the magnetic field generated between the rotor and the stator; and a sensor housing comprising: a first surface in which the eccentricity measuring element is embedded, and a central hole through a center of the sensor housing such that a rotating shaft of the rotor is fitted into the central hole, the first surface facing a distal end of the rotor.

[0009] Furthermore, the eccentricity measuring component can include: a sensor board that is inserted into the sensor housing; and an eccentricity measuring sensor that is embedded in the sensor board.

[0010] Furthermore, the sensor housing may include: an annular central mounting section having the central hole; and one or more sensor mounting sections extending radially outward from the central hole and arranged to accommodate the eccentricity measuring sensor within the one or more sensor mounting sections.

[0011] Furthermore, the sensor board can be coupled in such a way that it corresponds one-to-one to a first sensor mounting section under the one or more sensor mounting sections, wherein the sensor board is spaced a predetermined distance from the central mounting section, and the eccentricity measuring sensor can be embedded in such a way that it corresponds one-to-one to the sensor board.

[0012] Furthermore, the eccentricity measuring part may also include a signal line having a first end electrically connected to the sensor board and a second end electrically connected to an outside to transmit a detection signal to the outside, and the first sensor mounting section may include a signal transmission hole penetrating the first sensor mounting section so that the signal line passes through the signal transmission hole.

[0013] Furthermore, the sensor board can be coupled to a second surface of the sensor housing, the eccentricity measuring sensor can comprise a plurality of eccentricity measuring sensors, one or more eccentricity measuring sensors from the plurality of eccentricity measuring sensors can all be embedded in the first surface of the sensor housing, and an area in which a first eccentricity measuring sensor from the plurality of eccentricity measuring sensors is embedded can project radially outwards such that it corresponds one-to-one to at least one sensor mounting section under the one or more sensor mounting sections.

[0014] Furthermore, the eccentricity measuring part may also include: an external terminal electrically connected to the eccentricity measuring sensor and configured to transmit sensing information from the eccentricity measuring sensor to an outside; and a circuit pattern on a first surface of the eccentricity measuring part to electrically connect the external terminal and the eccentricity measuring sensor.

[0015] Furthermore, the circuit pattern may include: at least two power supply lines, each comprising two or more power supply terminals configured to supply power to the eccentricity measuring sensor and connected to the eccentricity measuring sensor; and a signal line comprising two or more signal output terminals configured to output a detection value from the eccentricity measuring sensor and connected to the eccentricity measuring sensor, each of the power supply lines and the signal line being able to extend in the same direction, and the two or more power supply terminals and the two or more signal output terminals being spaced apart at predetermined distances from each other.

[0016] Furthermore, the sensor board may also include a first mounting hole through a first area excluding a second area in which the circuit pattern is present; the sensor housing may also include a cover over an entire first surface of the sensor housing, and the cover may cover the sensor board, and the cover may include a second mounting hole that penetrates the cover at a position corresponding to the first mounting hole.

[0017] Furthermore, at least one sensor mounting section below the one or more sensor mounting sections may include a housing coupling section coupled to a motor housing in which the stator and rotor are accommodated, and the housing coupling section may include screw holes through the at least one sensor mounting section and the motor housing.

[0018] Furthermore, at least one sensor mounting section may include, below the one or more sensor mounting sections: a board insert slot recessed so that the sensor board is inserted into the board insert slot; and an interference avoidance slot recessed in a cylindrical shape based on a corner point of the board insert slot.

[0019] Furthermore, at least one sensor mounting section below the one or more sensor mounting sections may include a housing coupling section coupled to a motor housing in which the stator and rotor are accommodated, and the housing coupling section may include a stepped mounting section placed on a coupling structure of a bearing of the motor housing.

[0020] In addition, the sensor housing may further include a flat, plate-like potting component designed to cover and protect a first surface of the sensor board.

[0021] Furthermore, the eccentricity measuring sensor can comprise two or more eccentricity measuring sensors, and the eccentricity measuring sensors can be arranged so that they are spaced equally apart from each other.

[0022] Furthermore, the eccentricity measuring sensor can comprise two or more eccentricity measuring sensors, and the eccentricity measuring sensors can be arranged so that they are spaced apart from each other with a phase difference of 90 degrees. Brief description of the drawings Fig. Figure 1 is an axial cross-sectional view representing a motor system to which an eccentricity measurement system of the present disclosure is applied. Fig. Figure 2 is a top view showing an eccentricity measurement system according to a first embodiment of the present disclosure. Fig. Figure 3 is a schematic view representing an eccentricity measuring part of the first embodiment of the present disclosure. Fig. Figure 4 is an axial cross-sectional view representing a sensor housing of the first embodiment of the present disclosure. Fig. Figure 5 is a top view showing an eccentricity measurement system according to a second embodiment of the present disclosure. Fig. Figure 6 is a schematic view representing a circuit pattern according to the second embodiment of the present disclosure. Fig. Figure 7 is a schematic view showing a detailed embodiment of the circuit pattern according to the second embodiment of the present disclosure. Fig. Figure 8 is a top view showing a sensor board with first mounting holes of the second embodiment of the present disclosure. Fig. Figure 9 is a perspective view showing a sensor housing to which a cover of the second embodiment of the present disclosure is coupled. Fig. Figure 10 is a perspective view showing the sensor housing of the present disclosure. Fig. Figure 11 is a top view showing the sensor housing of the present disclosure. Fig. Figure 12 is an axial cross-sectional view representing the sensor housing of the present disclosure. Fig. Figure 13 is a perspective view showing the sensor housing to which a potting part of the present disclosure is coupled. Fig. Figures 14 to 16 are schematic views illustrating embodiments of an arrangement of an eccentricity measuring sensor of the present disclosure. Fig. 17 and Fig. Figure 18 shows schematic views illustrating a positional relationship between a rotor and the eccentricity measuring sensor in the case of tilting eccentricity. Fig. Figure 19 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 20 is a schematic view showing a positional relationship between the rotor and the eccentricity measuring sensor in the case of dynamic eccentricity. Fig. Figures 21 to 22 are schematic views showing graphs of magnetic flux magnitudes measured by two eccentricity sensors in the case of a tilting eccentricity. Fig. Figure 23 is a schematic view showing graphs of the magnetic flux amounts measured by the two eccentricity measurement sensors in the case of a static eccentricity. Fig. Figure 24 is a schematic view showing graphs of the magnetic flux amounts measured by the two eccentricity measurement sensors in the case of a dynamic eccentricity. Detailed description of the revelation

[0023] The technical concept 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 limited to a general or dictionary-like meaning, but should be interpreted as having a meaning and a concept corresponding to the technical concept of the present disclosure, based on the principle that an inventor can adequately define a concept of a term to describe his / her invention by the best possible means.

[0024] A basic configuration of an eccentricity measurement system 1000 of the present disclosure is described below with reference to Fig. 1 described.

[0025] As in Fig. As shown in Figure 1, 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 measure the eccentricity of the rotor R. The eccentricity measuring system 1000 can comprise eccentricity measuring elements 100 and a sensor housing 200. The eccentricity measuring element 100 can be configured to face an axial distal end face of the rotor R and measure the presence or absence of eccentricity of the rotor R using a change in the magnetic field generated between the rotor R and the stator S. The eccentricity measuring element 100 can include a Hall sensor, which is a magnetic flux density sensor.Therefore, it is possible to output an analog signal with a waveform to the outside to analyze a signal waveform of the rotor R's eccentricity, and the eccentricity of the rotor R can be detected by analyzing acquisition information by an external controller based on the analog signal. Furthermore, a central hole 210, into which a rotating shaft of the rotor R is fitted, is formed by the center of the sensor housing 200. A surface (e.g., the first surface) of the sensor housing 200 can be positioned to face the distal end of the rotor R, and the eccentricity measuring element 100 can be embedded in a surface of the sensor housing 200 facing the distal end of the rotor R.

[0026] The eccentricity measuring element 100, which measures the eccentricity, and the sensor housing 200, which carries the eccentricity measuring element 100, can be provided, as described above, at the axial distal end of the rotor R, thereby measuring the total tilting eccentricity, static eccentricity, and dynamic eccentricity of the rotor R, reducing costs compared to a prior art reflective laser sensor, capturing an eccentricity factor that most significantly affects noise and vibration of a rotating device, and detecting a defect at an early stage of mass production.

[0027] A first embodiment of the present disclosure is described below with reference to Fig. 2 to 4 are described in more detail.

[0028] As in Fig. As shown in Figure 2, the eccentricity measuring part 100 can comprise a sensor board 110 inserted into the sensor housing 200 and an eccentricity measuring sensor 120 embedded in the sensor board 110. Furthermore, the sensor housing 200 can include an annular central mounting section 220 with the central hole 210 and one or more sensor mounting sections 230 projecting radially outward from the central hole 210 and configured to embed the sensor boards 110 and the eccentricity measuring sensors 120 into the sensor mounting sections 230. The sensor housing 200 can also be a non-conductive injection-molded plastic product. Therefore, a motor housing H made of a metallic material can be electrically insulated from the sensor board 110 of the eccentricity measuring part 100.

[0029] In this case, in the first embodiment of the eccentricity measuring system 1000 of the present disclosure, the sensor mounting sections 230 can be provided as one or more sensor mounting sections 230, and the sensor boards 110 of the eccentricity measuring parts 100 can be provided separately for the respective eccentricity measuring sensors 120. More precisely, the sensor board 110 can be coupled such that it corresponds one-to-one to the sensor mounting section 230 and is spaced apart from the central mounting section 220 at a predetermined distance. That is, the sensor board 110 and the eccentricity measuring sensor 120 can be fixed such that they correspond one-to-one to the sensor mounting section 230. Furthermore, the sensor mounting sections 230 can protrude by the same length, so that the distances between the eccentricity measuring sensors 120 and the center hole 210 are constant.Therefore, if eccentricity occurs in the rotor R, signal values ​​measured by the respective eccentricity measurement sensors can differ from each other, and the type of eccentricity of the rotor R and the direction in which the rotor R is eccentric can be more easily identified.

[0030] Furthermore, the number of applied eccentricity measuring sensors 120 can be limited to prevent saturation of the Hall sensor due to a large magnetic flux of the rotor R under the operating conditions of a motor to which the eccentricity measuring system 1000 of this disclosure is applied. This can also be controlled by adjusting the coupling position of the sensor housing 200, i.e., the axial spacing between the eccentricity measuring element 100, the sensor housing 200, and the rotor R. Additionally, the eccentricity measuring sensor 120 can be a surface-mountable eccentricity measuring sensor coupled to a surface (e.g., the first surface) of the sensor board 110.Furthermore, since the eccentricity measuring sensor 120 is coupled to a surface of the sensor board 110, the type and specification of the eccentricity measuring sensor 120 can be easily changed according to a usage environment (temperature or similar) of the motor, making it possible to achieve advantages in terms of repair and manufacturing costs.

[0031] Furthermore, as in Fig. Figure 3 shows the eccentricity measuring unit 100 comprising signal lines 130, each having one end (e.g., a first end) electrically connected to the sensor board 110 and the other end (e.g., a second end) electrically connected to the outside to transmit a detection signal to the outside. The signal line 130 can penetrate the sensor housing 200 and be electrically connected to an external controller. Therefore, the external controller can analyze a magnetic field signal generated by the eccentricity measuring sensor 120, which is a Hall sensor. Furthermore, the presence or absence of eccentricity in the rotor R can be detected.

[0032] Furthermore, as in Fig. As shown in Figure 4, the sensor mounting section 230 includes a signal transmission hole 233 which is designed to pass through, allowing the signal lines 130 to pass through the signal transmission hole 233. Because the signal transmission hole 233 is included, the signal lines 130 of the eccentricity measuring part 100 can be connected to the external control provided outside the sensor housing 200, and a measured value from the eccentricity measuring sensor 120 can be output to the external control.

[0033] As described above, by applying the first embodiment of the present disclosure, the eccentricity measuring sensors 120 can each be mounted on each of the small sensor boards 110, thereby improving the convenience of using the eccentricity measuring sensors 120 together in different motors. That is, one shape of the sensor housing 200 may not be limited as long as a holder for assembling the eccentricity measuring element 100 is provided.

[0034] A second embodiment of the present disclosure is described below with reference to Fig. Sections 5 to 9 are described in more detail.

[0035] As in Fig. As shown in Figure 5, the eccentricity measuring part 100 can comprise the sensor board 110, which is inserted into the sensor housing 200, and the eccentricity measuring sensors 120, which are embedded in the sensor board 110. Furthermore, the sensor housing 200 can comprise the annular central mounting section 220 with the central hole 210 and one or more sensor mounting sections 230, which project radially outward from the central hole 210 and are configured to embed the sensor board 110 and the eccentricity measuring sensors 120 in the sensor mounting sections 230. In addition, the sensor housing 200 can be a non-conductive injection-molded plastic product. Therefore, the motor housing H, which is made of a metallic material, can be electrically insulated from the sensor board 110 of the eccentricity measuring part 100.

[0036] In this case, in the second embodiment of the eccentricity measuring system 1000 of the present disclosure, the sensor board 110 can be coupled to a front surface (e.g., second surface) of the sensor housing 200, and one or more eccentricity measuring sensors 120 can all be embedded in a surface of the sensor board 110. In this case, areas in the sensor board 110 in which the eccentricity measuring sensors 120 are embedded can project radially outward to correspond to the plurality of sensor mounting sections 230.

[0037] Furthermore, the number of applied eccentricity measuring sensors 120 can be adjusted to prevent saturation of the Hall sensor due to a large magnetic flux of the rotor R under the operating conditions of a motor to which the eccentricity measuring system 1000 of this disclosure is applied. This can also be controlled by adjusting the coupling position of the sensor housing 200, i.e., the axial spacing between the eccentricity measuring element 100, the sensor housing 200, and the rotor R. Additionally, the eccentricity measuring sensor 120 can be a surface-mountable eccentricity measuring sensor coupled to a surface of the sensor board 110.Furthermore, since the eccentricity measuring sensor 120 is coupled to a surface of the sensor board 110, the type and specification of the eccentricity measuring sensor 120 can be easily changed according to a usage environment (temperature or similar) of the motor, making it possible to achieve advantages in terms of repair and manufacturing costs.

[0038] As described above, since the majority of eccentricity measuring sensors 120 are coupled to a sensor board 110, the majority of eccentricity measuring sensors 120 can be integrally removed from the sensor housing 200. Therefore, the sensor housing 200, which can be inserted into a sensor board 110, can be used jointly for different types of motors, thus improving convenience. That is, one shape of the sensor housing 200 is not necessarily limited as long as a holder shape for assembling the eccentricity measuring element 100 is available.

[0039] Furthermore, in the second embodiment of the present disclosure, the eccentricity measuring part 100 can also comprise an external port 150, which is electrically connected to the eccentricity measuring sensor 120 and is configured to transmit detection information from the eccentricity measuring sensor 120 to the outside, and a circuit pattern 140 printed on a surface (e.g., first surface) of the eccentricity measuring part 100 to electrically connect the external port 150 and the eccentricity measuring sensor 120. A connector electrically connected to the external controller can be inserted into the external port 150, thus electrically connecting the external controller, the circuit pattern 140, and the eccentricity measuring sensor 120.

[0040] Furthermore, as in Fig. Figure 6 shows the circuit pattern 140 comprising power supply lines 141 and a signal line 142. The power supply lines 141 may include power supply terminals 141a, which are configured to supply power to the eccentricity measuring sensor 120 and are connected to the eccentricity measuring sensor 120. The power supply lines 141 may be printed as two + and - lines on each of the eccentricity measuring sensors 120. At least one power supply terminal 141a may be provided on each of the power supply lines 141. In addition, the signal line 142 may include signal output terminals 142a, which are configured to output a detection value from the eccentricity measuring sensor 120 and are connected to the eccentricity measuring sensor 120. One signal line 142 may be printed on each of the eccentricity measuring sensors 120.

[0041] Furthermore, in a detailed embodiment of the second embodiment of the present disclosure, as described in Fig. As shown in Figure 7, the power supply line 141 and the signal line 142 can be configured to extend in the same direction. For example, the power supply line 141 and the signal line 142 can extend radially in an area corresponding to the sensor mounting section 230. Furthermore, the power supply terminals 141a and the signal output terminals 142a can be provided as two or more power supply terminals and two or more signal output terminals, respectively, located on the power supply line 141 and the signal line 142 and spaced apart at predetermined intervals. More precisely, the power supply terminals 141a and the signal output terminals 142a can be configured to be spaced apart at predetermined intervals in the radial direction that corresponds to the direction of extension of the power supply line 141 and the signal line 142.

[0042] Therefore, a plurality of pairs of connections, each comprising two power supply connections 141a and one signal output connection 142a, to which the eccentricity measuring sensor 120 can be coupled, can be provided in the radial direction. Thus, the position to which the eccentricity measuring sensor 120 is coupled can be easily changed. That is, the radial position to which the eccentricity measuring sensor 120 is coupled can be easily changed, so that the eccentricity measuring system 1000 can be easily applied even if a radial target position of the eccentricity measuring sensor 120 varies depending on a change in the motor type.

[0043] Furthermore, as in Fig. As shown in Figure 8, the sensor board 110 further comprises first mounting holes 111, which are penetrating in one area (e.g., a first area) to the exclusion of the area (e.g., a second area) in which the circuit pattern 140 is formed. This is because the first mounting holes 111 can be configured to avoid the circuit pattern 140 without interfering with the electrical connection between the eccentricity measuring sensors 120, the external connection 150, and the external control. For this purpose, the first mounting holes 111 can be configured to have different distances from the center. That is, a and b in Fig. Ten can be different from each other. Furthermore, as in Fig. As shown in Figure 9, the sensor housing 200 can include a cover 240 that extends over its entire surface and is configured to cover the sensor board 110. The cover 240 can include second mounting holes 241 that penetrate the first mounting holes 111 at positions corresponding to the first mounting holes 111. In this case, fasteners can be inserted into the first mounting holes 111 and the second mounting holes 241, and the positions of the first mounting holes 111 and the positions of the second mounting holes 241 can be fixed. The inclusion of the cover 240 allows the eccentricity measurement system 1000 of this disclosure to be used even in harsh environments, thereby improving the usability of the eccentricity measurement system 1000.

[0044] The sensor housing 200 of the present disclosure is described below with reference to the Fig. 10 to 13 described in detail.

[0045] As in Fig. As shown in Figure 11, in this case, the sensor mounting sections 230 can each include a circuit board insert groove 231, which is concave so that the sensor board 110 is inserted into the circuit board insert groove 231, and interference-avoidance grooves 232, which are concave and cylindrical based on the corner points of the circuit board insert groove 231. The circuit board insert groove 231 can be the same thickness as the sensor board 110 or deeper than the sensor board 110. Furthermore, the interference-avoidance grooves 232 can be formed at the respective corner points of the circuit board insert groove 231. Because the circuit board insert groove 231 is included, the sensor board 110 can be fully inserted into the sensor housing 200 without protruding from any outer surface of the sensor housing 200.Furthermore, the inclusion of the interference avoidance grooves 232 makes it easier to insert the sensor board 110 into the board insertion groove 231.

[0046] Furthermore, as in Fig. As shown in Figure 11, the sensor mounting section 230 comprises housing coupling sections 234 that are coupled to the motor housing H, in which the stator S and the rotor R are housed. The housing coupling section 234 can include screw holes 234a formed through the sensor mounting sections 230 and the motor housing H. Fasteners can be inserted into the screw holes 234a. The fastener inserted into the screw hole 234a can penetrate the sensor housing 200 and be inserted into the motor housing H. At least one screw hole 234a can be formed in each of the radially outwardly projecting sensor mounting sections 230. Therefore, the positions of the sensor mounting sections 230, to which the eccentricity measuring sensors 120 are attached, can be kept constant, further improving the accuracy in measuring the eccentricity.

[0047] Fig. Figures 10 to 11 illustrate the sensor housing 200 of the second embodiment of the present disclosure. All components, from the circuit board insert groove 231, the interference avoidance groove 232, the housing coupling section 234 and the components arranged below it, can also be applied to the first embodiment of the present disclosure (see Figure 10 to 11). Fig. 4) be applied.

[0048] Furthermore, as in Fig. As shown in Figure 12, the housing coupling section 234 includes a stepped mounting section 234b, which is placed on a coupling structure of a bearing B of the motor housing H. The inclusion of the stepped mounting section 234b allows the axial position of the sensor housing 200 to be fixed. A radial position of the sensor housing 200 can be maintained by the aforementioned center hole 210. Therefore, even when the motor rotates at high speed, the position of the sensor housing 200 can be fixed more stably, further improving the accuracy in measuring eccentricity.

[0049] Furthermore, as in Fig. As shown in Figure 13, the sensor housing 200 further comprises a flat, plate-like potting element 235, which is configured to cover and protect a surface of the sensor board 110. The potting element 235 can be made of epoxy or silicone. In this case, the depth of the board insert groove 231 can be greater than the sum of the height of the sensor board 110 and the height of the eccentricity measuring sensor 120. The potting element 235 can then be added to the board insert groove 231, thereby protecting the eccentricity measuring sensor 100 from the external environment. Because the potting element 235 is included, the eccentricity measuring system 1000 of this disclosure can be used even in harsh environments, thus improving the usability of the eccentricity measuring system 1000.

[0050] Furthermore, for example, the eccentricity measuring element 100 is pre-inserted into a mold for injection molding the sensor housing 200, and the eccentricity measuring element 100 can be manufactured together with the sensor housing 200 by insert injection molding. In this case, a material that can be injected at a low temperature can be applied to the sensor housing 200, taking into account the heat resistance of the eccentricity measuring element 100. For example, a bulk molding compound (BMC) can be used as a material for the sensor housing 200. By applying the configuration mentioned above, the eccentricity measuring system 1000 of the present disclosure can be used even in harsh environments, thereby improving the usability of the eccentricity measuring system 1000.

[0051] Exemplary embodiments of an arrangement of the eccentricity measuring sensor 120 of the present disclosure are described below with reference to the Fig. 14 to 16 described in more detail.

[0052] As in Fig. 14 and Fig. As shown in Figure 15, two or more eccentricity measuring elements 100 can be arranged in the sensor housing 200, one eccentricity measuring element 100 can be embedded in each of the sensor mounting sections 230, and the eccentricity measuring sensors 120 embedded in the eccentricity measuring elements 100 can be arranged so that they are equally spaced apart. Since two or more eccentricity measuring sensors 120 are used, the eccentric condition 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 Figure 15, the eccentricity measuring elements 100 can be arranged in the sensor housing 200. Fig. Figure 14 shows that, in the case where three eccentricity measuring sensors 120 are used, the eccentricity measuring sensors 120 are positioned at positions with a phase difference of 120 degrees based on the stator S and a rotational axis of the rotor R. Alternatively, as shown in Fig. Figure 15 shows that, in the case where four eccentricity measuring sensors 120 are used, the eccentricity measuring sensors 120 are positioned at positions with a phase difference of 90 degrees based on the stator S and the rotation axis of the rotor R. Similarly, in the case where two eccentricity measuring sensors 120 are used, the eccentricity measuring sensors 120 can be positioned at positions with a phase difference of 180 degrees based on the stator S and the rotation axis of the rotor R.

[0053] Furthermore, as in Fig. As shown in Figure 16, two or more eccentricity measuring elements 100 are arranged in the sensor housing 200. One eccentricity measuring element 100 can be embedded in each of the sensor mounting sections 230, and the eccentricity measuring sensors 120 embedded in the eccentricity measuring elements 100 can be arranged such that they are spaced apart from each other while having a phase difference of 90 degrees. Therefore, the eccentric condition can be detected by comparing data between the sensors, in case it is difficult to detect the reference data when no eccentricity is present.

[0054] An algorithm for measuring the eccentricity of the rotor R using the eccentricity measuring sensor 120 of the present disclosure is described below with reference to the Fig. Described in sections 17 to 24.

[0055] As in Fig. As shown in Figure 17, if an eccentricity sensor 120 is used and an upper end R1 and a lower end R2 of the rotor are inclined in opposite (radial) directions to the same extent (tilting eccentricity case 1), the magnetic flux on the side near the eccentricity sensor 120 can increase, and the magnetic flux on the side farther from the eccentricity sensor 120 can decrease. That is, the total magnetic flux can change.

[0056] More precisely, in the case where eccentricity is in a left / right direction in Fig. 17. When this occurs, an aspect can be 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 120. Conversely, if the magnetic flux decreases at the upper end (R1) of the rotor, it can be determined that the lower end (R2) of the rotor is inclined towards the eccentricity sensor 120.

[0057] Furthermore, in the case that eccentricity is in an upward / downward direction in Fig. When 17 occurs, both the upper end R1 and the lower end R2 of the rotor R are located away from the eccentricity measuring sensor 120, 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 120.

[0058] As in Fig. As shown in Figure 18, in the case where an eccentricity measuring sensor 120 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 can come close to or away from the eccentricity measuring sensor 120, so that the amount of magnetic flux can increase or decrease.

[0059] More precisely, in the case of eccentricity, an aspect can be measured where 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, if the magnetic flux at the lower end R2 of the rotor is tilted, then the lower end R2 of the rotor is tilted.

[0060] As in Fig. As shown in Figure 19, if an eccentricity sensor 120 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), then both the upper end R1 and the lower end R2 of the rotor R can move closer to or further away from the eccentricity sensor 120 in the same way, so that the magnetic flux magnitude can increase or decrease. That is, it can be determined that the rotor R is statically eccentric to the eccentricity sensor 120 if the magnetic flux magnitudes at the upper end R1 and 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 120 if the magnetic flux magnitudes at the upper end R1 and the lower end R2 of the rotor decrease simultaneously in the same way.

[0061] Furthermore, as in Fig. Figure 20 illustrates the case where an eccentricity sensor 120 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, when the rotor R moves close to the eccentricity sensor 120, the amount of magnetic flux can increase if the cycle of the magnetic flux decreases. Conversely, when the rotor R moves away from the eccentricity sensor 120 in the opposite direction, the amount of magnetic flux can decrease if the cycle of the magnetic flux increases.

[0062] Furthermore, as in Fig. Figure 21 shows that, in the case where two eccentricity measuring sensors 120 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 120 increases, and the magnetic flux on the side farther from the eccentricity measuring sensor 120 can decrease. That is, the total magnetic flux can change.

[0063] For example, if a first eccentricity sensor 120A and a second eccentricity sensor 120B are arranged at a phase difference of 180 degrees, and the tilting eccentricity of the rotor R occurs at both the first eccentricity sensor 120A and the second eccentricity sensor 120B, the magnetic flux magnitude, compared to a reference magnetic flux magnitude determined when no eccentricity occurs, may partially decrease at both the first eccentricity sensor 120A and the second eccentricity sensor 120B. 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 120A and the second eccentricity sensor 120B.

[0064] Furthermore, as in Fig. Figure 22 shows that in the case where two eccentricity measuring sensors 120 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 120 increases, the magnetic flux amount on the side farther from the eccentricity measuring sensor 120 decreases, and the magnetic flux amount on another side is maintained.For example, if the first eccentricity measuring sensor 120A and the second eccentricity measuring sensor 120B are arranged so that they are spaced apart by 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 comes close to the second eccentricity measuring sensor 120B, the magnetic flux magnitude at the first eccentricity measuring sensor 120A may become partially smaller than a reference value, and the magnetic flux magnitude at the second eccentricity measuring sensor 120B may become partially larger than the reference value.

[0065] Furthermore, as in Fig. Figure 23 illustrates the case where two eccentricity measuring sensors 120 are used and both the upper end R1 and the lower end R2 of the rotor R are constantly eccentric, i.e., in the case where 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 closer to or further away from the eccentricity measuring sensor 120 in the same way, so that the magnetic flux magnitude can increase or decrease. That is, the magnetic flux magnitudes 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 120A and the second eccentricity measuring sensor 120B are arranged so that they are spaced apart by a phase difference of 180 degrees, and the eccentricity of the rotor occurs such that the rotor comes close to the second eccentricity measuring sensor 120B, the magnetic flux magnitude at the first eccentricity measuring sensor 120A may become significantly smaller than a reference value, and the magnetic flux magnitude at the second eccentricity measuring sensor 120B may become significantly larger than the reference value.

[0066] Furthermore, as in Fig.Figure 24 illustrates the case where two eccentricity sensors 120 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 also 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 120A and the second eccentricity sensor 120B are arranged with a phase difference of 180 degrees and dynamic eccentricity occurs in the rotor R, the magnetic flux magnitude graphs of the first eccentricity sensor 120A and the second eccentricity sensor 120B can be formed in opposite directions and differ from the reference value in magnetic flux magnitude and cycle.

[0067] Furthermore, at least two or more of the tilting eccentricities, the static eccentricities, and the dynamic eccentricities can occur while overlapping each other. In this case, the type of eccentricity can be analyzed by comparing each of the eccentricity data with the measured data.

[0068] The eccentricity measuring system of the present disclosure can comprise the eccentricity measuring sensor mounted in the motor and configured to measure the total tilting eccentricity, the static eccentricity, and the dynamic eccentricity of the rotor by using a change in the magnetic field generated between the rotor and the stator, thereby overcoming a limitation of a prior art reflective laser sensor method, 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, detecting a defect at the initial stage of mass production to prevent the shipment of potentially defective products, and measuring eccentricity caused by abrasion or the like after product durability tests or after prolonged operation of the vehicle.to identify a problem in advance and take preventative measures such as repairs.

[0069] 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 used in situations where external vibrations or noise make it difficult to detect the condition of an individual rotary device. This allows the system to proactively detect and resolve problems in the electric motor used in urban air mobility (UAM) aircraft.

[0070] The technical teaching should not be interpreted as being limited to the embodiments described in 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 protection of the present disclosure, provided they are obvious to those skilled in the field. Description of the reference symbols 1000 eccentricity measurement system 100 eccentricity measuring part 110 Sensor board 111 First mounting hole 120 eccentricity measuring sensor 130 Signal line 140 circuit patterns 141 Power supply line 141a Power supply connection 142 Signal line 142a Signal output connector 150 External connection 200 sensor housings 210 center hole 220 Central fortification section 230 Sensor mounting section 231 PCB insert slot 232 Interference avoidance nut 233 Signal transmission hole 234 Housing coupling section 234a Screw hole 234b Stepped fastening section 235 Potting compound 236 Housing coupling section 240 coverage 241 Second mounting hole 120A First eccentricity measurement sensor 120B Second eccentricity measurement sensor S Stator R Rotor R1 Upper rotor end R2 Lower rotor end H Motor housing B Storage 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 designed to be 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 element designed to detect the presence or absence of rotor eccentricity by measuring a change in the magnetic field generated between the rotor and the stator; and a sensor housing, comprising: a first surface in which the eccentricity measuring element is embedded, and a central hole through the center of the sensor housing, so that a rotating shaft of the rotor is fitted into the central hole, the first surface faces a distal end of the rotor. [2] Eccentricity measuring system according to claim 1, wherein the eccentricity measuring part comprises: a sensor board that is inserted into the sensor housing; and an eccentricity measurement sensor that is embedded in the sensor board. [3] Eccentricity measuring system according to claim 2, wherein the sensor housing comprises: a ring-shaped central mounting section having the central hole; and one or more sensor mounting sections that project radially outwards from the central hole and are arranged so that the eccentricity measuring sensor is embedded in the one or more sensor mounting sections. [4] Eccentricity measuring system according to claim 3, wherein the sensor board is coupled in such a way that it corresponds one-to-one to a first sensor mounting section under the one or more sensor mounting sections, wherein the sensor board is spaced a predetermined distance from the central mounting section, and the eccentricity measuring sensor is embedded in such a way that it corresponds one-to-one with the sensor board. [5] Eccentricity measuring system according to claim 4, wherein the eccentricity measuring element further comprises a signal line having a first end that is electrically connected to the sensor board and a second end that is electrically connected to an outside surface to transmit a detection signal to the outside surface, and wherein the first sensor mounting section includes a signal transmission hole that penetrates the first sensor mounting section so that the signal line passes through the signal transmission hole. [6] Eccentricity measuring system according to one of claims 3 to 5, where the sensor board is coupled to a second surface of the sensor housing, where the eccentricity measuring sensor comprises a plurality of eccentricity measuring sensors, wherein one or more eccentricity measuring sensors from the plurality of eccentricity measuring sensors are all embedded in the first surface of the sensor housing, and wherein a region in which a first eccentricity measuring sensor from the plurality of eccentricity measuring sensors is embedded projects radially outwards, such that it corresponds one-to-one to at least one sensor mounting section under the one or more sensor mounting sections. [7] Eccentricity measuring system according to claim 6, wherein the eccentricity measuring part further comprises: an external connection that is electrically connected to the eccentricity sensor and is configured to transmit eccentricity sensor acquisition information to an external surface; and a circuit pattern on a first surface of the eccentricity measuring part to electrically connect the external terminal and the eccentricity measuring sensor. [8] Eccentricity measurement system according to claim 7, wherein the circuit pattern comprises: at least two power supply lines, each comprising two or more power supply terminals configured to supply power to and connected to the eccentricity measuring sensor; and a signal line comprising two or more signal output terminals configured to output a detection value from the eccentricity measurement sensor, and connected to the eccentricity measurement sensor, where each of the power supply lines and the signal line extend in the same direction, and wherein the two or more power supply connections are spaced apart at predetermined intervals along the power supply line, wherein the two or more signal output terminals are spaced apart from each other at predetermined intervals along the signal line. [9] Eccentricity measuring system according to claim 7 or 8, wherein the sensor board further comprises a first mounting hole through a first area excluding a second area in which the circuit pattern is present, wherein the sensor housing further comprises a cover over an entire first surface of the sensor housing, and the cover covers the sensor board, and wherein the cover includes a second mounting hole that penetrates the cover at a position corresponding to the first mounting hole. [10] Eccentricity measuring system according to one of claims 3 to 9, wherein at least one sensor mounting section comprises a housing coupling section below the one or more sensor mounting sections, which is coupled to a motor housing in which the stator and the rotor are received, and wherein the housing coupling section comprises screw holes through the at least one sensor mounting section and the motor housing. [11] Eccentricity measuring system according to any one of claims 3 to 10, wherein at least one sensor mounting section comprises below the one or more sensor mounting sections: a circuit board insert slot that is recessed so that the sensor board is inserted into the circuit board insert slot; and an interference avoidance groove that is recessed in a cylindrical shape based on a corner point of the circuit board insert groove. [12] Eccentricity measuring system according to one of claims 3 to 11, wherein at least one sensor mounting section below the one or more sensor mounting sections comprises a housing coupling section which is coupled to a motor housing in which the stator and rotor are received, and wherein the housing coupling section comprises a stepped mounting section which is placed on a coupling structure of a bearing of the motor housing. [13] Eccentricity measuring system according to one of claims 2 to 12, wherein the sensor housing further comprises a flat plate-like potting part which is configured to cover and protect a first surface of the sensor board. [14] Eccentricity measuring system according to one of claims 2 to 13, wherein the eccentricity measuring sensor comprises two or more eccentricity measuring sensors, and the eccentricity measuring sensors are arranged such that they are spaced apart from each other at equal intervals. [15] Eccentricity measuring system according to any one of claims 2 to 14, wherein the eccentricity measuring sensor comprises two or more eccentricity measuring sensors, and the eccentricity measuring sensors are arranged such that they are spaced apart from each other with a phase difference of 90 degrees.

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