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 element that measures the presence or absence of rotor eccentricity by measuring a change in the magnetic field generated between the rotor and the stator, wherein the eccentricity measuring element comprises one or more eccentricity measuring sensors; and a detection housing that includes: a surface in which the eccentricity measuring element is embedded; and a central hole formed by the center of the sensor housing, wherein a rotating shaft of the rotor is fitted into the central hole, wherein the eccentricity measuring element is coupled to a front surface of the sensing housing and comprises a sensing board arranged on a surface of the eccentricity measuring element, such that the one or more eccentricity measuring sensors are embedded in the sensing board, and wherein the one or more eccentricity measurement sensors comprise a sensing port extending in an axial direction and electrically connected to the sensing board.

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. 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 may collide with other external components, which limits the sensor mounting structure and increases the system cost. State of the art document

[0005] (Patent document 1) 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 identify a problem in advance and 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-established 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 vibration or noise. Thus, the eccentricity measurement system can be used to proactively detect and address problems in an electric motor used in urban air mobility (UAM) aircraft.

[0008] To achieve the above-mentioned objective, an embodiment of the present disclosure provides an eccentricity measuring system that is applied to a motor system comprising a stator and a rotor and measures an eccentricity of the rotor, wherein the eccentricity measuring system comprises: an eccentricity measuring element that measures the presence or absence of eccentricity of the rotor by measuring a change in the magnetic field generated between the rotor and the stator, wherein the eccentricity measuring element comprises one or more eccentricity measuring sensors;and a sensing housing comprising a surface in which the eccentricity measuring element is embedded, and comprising a central hole formed by a center of the sensing housing, wherein a rotating shaft of the rotor is fitted into the central hole, wherein the eccentricity measuring element is coupled to a front surface of the sensing housing and comprising a sensing board arranged on a surface of the eccentricity measuring element such that one or more eccentricity measuring sensors are embedded in the sensing board, and wherein the eccentricity measuring sensor comprises a sensing terminal extending in an axial direction and electrically connected to the sensing board.

[0009] Furthermore, the eccentricity measuring part may also include: an external terminal that is electrically connected to the eccentricity measuring sensor and transmits sensing information from the eccentricity measuring sensor to the outside; and a circuit pattern printed on a surface of the eccentricity measuring part to electrically connect the external terminal and the eccentricity measuring sensor.

[0010] Furthermore, the circuit pattern may include: two power supply lines, each comprising a power supply terminal connected to the sensing terminal of the eccentricity measuring sensor and supplying current to the eccentricity measuring sensor; and a signal line comprising a signal output terminal connected to the sensing terminal of the eccentricity measuring sensor and outputting a sensing value from the eccentricity measuring sensor, wherein each of the power supply lines and the signal line may extend in the same direction, and wherein the power supply terminal and the signal output terminal may be provided as two or more power supply terminals and two or more signal output terminals, respectively, provided in the power supply line and the signal line and spaced apart at predetermined distances from each other.

[0011] Furthermore, the sensing housing may include: an annular central fixing section having the central hole; a sensor fixing section projecting radially outward from the central hole and configured to embed the eccentricity measuring sensor in the sensor fixing section; a board insertion groove arranged concavely in the axial direction so that the sensing board is inserted into the board insertion groove; and a interference contour avoidance groove arranged concavely in the axial direction in a cylindrical shape based on a vertex of the board insertion groove.

[0012] Furthermore, the sensing housing may also include: a protection step section arranged along an edge of the sensing housing and having an axial extension height equal to or greater than the height of the eccentricity measuring sensor; and a flat, plate-like potting component covering and protecting a surface of the sensing board and arranged within the protection step section, the potting component having a height equal to or greater than the height of the eccentricity measuring sensor including the sensing connector.

[0013] Furthermore, the sensing housing may also include: a protection stage section arranged along an edge of the sensing housing and having an axial extension height equal to or greater than the height of the eccentricity measuring sensor; and a holder having a surface that covers and protects a surface of the sensing board, the holder being provided within the protection stage section and comprising a sensor receiving groove projecting in the axial direction such that the eccentricity measuring sensor is received in the sensor receiving groove.

[0014] Furthermore, the sensing housing may also include a locking section that fixes a position of the holder, and the locking section may include: a column projecting in the axial direction from an edge of the sensing housing; and a locking step section projecting in a radial direction from a distal end of the column and adjacent to the other surface of the holder.

[0015] Furthermore, the sensing board can also include a first fixing hole formed penetrating in an area excluding an area in which the circuit pattern is formed, wherein the sensing housing can include a cover arranged over the entirety of a surface and covering the sensing board, and wherein the cover can include a second fixing hole arranged penetrating at a position corresponding to the first fixing hole.

[0016] Furthermore, the eccentricity measurement sensor can be provided as two or more eccentricity measurement sensors arranged on the sensing board, and the eccentricity measurement sensors can be arranged so that they are spaced equally apart from each other.

[0017] Furthermore, the eccentricity measurement sensor can be provided as two or more eccentricity measurement sensors arranged on the sensing board, and the eccentricity measurement sensors can be arranged so that they are spaced apart from each other while having a phase difference of 90 degrees. Brief description of the drawings Fig. Figure 1 is an axial cross-sectional view showing a motor system to which an eccentricity measurement system of the present disclosure is applied. Fig. Figure 2 is a partial perspective view showing an eccentricity measurement sensor of the present disclosure. Fig. Figure 3 is a top view showing the eccentricity measurement system of the present disclosure. Fig. Figure 4 is a schematic view showing a circuit pattern of the present disclosure. Fig. Figure 5 is a top view showing a capture housing of the present disclosure. Fig. Figure 6 is a perspective view showing the capture housing of the present disclosure. Fig. Figure 7 is a perspective view showing the capture housing to which a potting part of the present disclosure is coupled. Fig. Figure 8 is a perspective view showing a holder of the present revelation. Fig. Figure 9 is a perspective view showing the capture housing to which the holder of the present disclosure is coupled. Fig. Figure 10 is a partial perspective view showing a locking section of the present revelation. Fig. Figure 11 is an axial cross-sectional view showing the capture housing of the present disclosure. Fig. Figure 12 is a top view showing a capture board having a first fixing hole of the present disclosure. Fig. Figure 13 is a perspective view showing the capture housing to which a cover of the present disclosure is coupled. Fig. Figures 14 to 16 are schematic views showing embodiments of an arrangement of the 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 measurement 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 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 dynamic eccentricity. Detailed description of the revelation

[0018] 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 to describe his invention by the best possible means.

[0019] A basic configuration of an eccentricity measurement system 1000 of the present disclosure is described below with reference to Fig. 1 described.

[0020] 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 can measure the eccentricity of the rotor R. The eccentricity measuring system 1000 can comprise an eccentricity measuring element 100 and a sensing housing 200. The eccentricity measuring element 100 can be positioned facing an axial distal end face of the rotor R and can 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. Furthermore, a center hole 210, into which a rotating shaft of the rotor R is fitted, is formed by a center of the sensing housing 200.A surface of the sensing housing 200 can be provided such that it faces the distal end of the rotor R, and the eccentricity measuring element 100 can be embedded in a surface of the sensing housing 200 that faces the distal end of the rotor R.

[0021] The eccentricity measuring element 100, which measures the eccentricity, and the sensing housing 200, which supports the eccentricity measuring element 100, can be provided at the axial distal end of the rotor R, as described above, thereby measuring the tilting eccentricity, axial eccentricity, and dynamic eccentricity of the rotor R, reducing costs compared to a prior art reflective laser sensor, detecting an eccentricity factor that most significantly affects the noise and vibration of a rotating device, and detecting a defect at an early stage of mass production.

[0022] The eccentricity measurement section of the present disclosure will be explained in more detail below with reference to Fig. 2 to 4 described.

[0023] As in Fig. As shown in Figure 2, the eccentricity measuring element 100 can comprise a sensing board 110 coupled to a front surface of the sensing housing 200, which has a surface in which one or more eccentricity measuring sensors 120 are embedded. In this case, the eccentricity measuring sensor 120 can be a Hall sensor. Therefore, it is possible to output an analog signal with a waveform to the outside in order to analyze a signal waveform of the rotor R's eccentricity, and the eccentricity of the rotor R can be detected by analyzing sensing information by an external controller based on the analog signal.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 sensing housing 200, i.e., the axial distance between the eccentricity measuring element 100, the sensing housing 200, and the rotor R.

[0024] Furthermore, the eccentricity sensor 120 can be a lead-type sensor. More specifically, the eccentricity sensor 120 can include a sensing terminal extending axially and electrically connected to a sensing board. Therefore, the eccentricity sensor 120 can be manufactured to be integrated with a sensing board 110 and used jointly with various motor types. Moreover, the type and specifications of the eccentricity sensor 120 can be easily modified according to the operating environment (temperature, etc.) of the motor, thus offering advantages in terms of repair and manufacturing costs.

[0025] As described above, since the majority of eccentricity measuring sensors 120 are coupled with a sensing board 110, the majority of eccentricity measuring sensors 120 can be integrally removed from the sensing housing 200. Therefore, the sensing housing 200, which can be inserted into a sensing board 110, can be used jointly for different motor types, thus improving convenience. That is, the shape of the sensing housing 200 need not be limited as long as a holder 260 for mounting the eccentricity measuring element 100 is available.

[0026] Furthermore, as in Fig. Figure 3 shows that the eccentricity measuring unit 100 further comprises an external port 130, which is electrically connected to the eccentricity measuring sensor 120 and is configured to transmit acquisition information from the eccentricity measuring sensor 120 to the outside, and a circuit pattern 140, which is printed on a surface of the eccentricity measuring unit 100, to electrically connect the external port 130 and the eccentricity measuring sensor 120. A connector, which is electrically connected to the external controller, can be inserted into the external port 130, so that the external controller, the circuit pattern 140, and the eccentricity measuring sensor 120 are electrically connected.

[0027] Furthermore, as in Fig. As shown in Figure 4, the circuit pattern 140 comprises 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 positive and negative 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 a signal output terminal 142a, which is configured to output a detection value from the eccentricity measuring sensor 120 and is connected to the eccentricity measuring sensor 120. A signal line 142 can be printed on each of the eccentricity measuring sensors 120.

[0028] Furthermore, 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 areas corresponding to sensor fixing sections 230. Additionally, 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, on the power supply line 141 and the signal line 142, spaced apart at predetermined intervals. More precisely, the power supply terminals 141a and the signal output terminals 142a can be provided 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.

[0029] Therefore, a plurality of connection pairs, 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 at which the eccentricity measuring sensor 120 is coupled can be easily changed. That is, the radial position at 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.

[0030] The following section describes the capture housing of the present disclosure in more detail with reference to Fig. 5 to 11 described.

[0031] As in Fig. As shown in Figure 5, the sensing housing 200 can comprise an annular central fixing section 220, which has the central hole 210, and the sensor fixing sections 230, which project radially outward from the central hole 210 and are arranged such that the eccentricity measuring sensors 120 are embedded in the sensor fixing sections 230. The sensing housing 200 can be a non-conductive injection-molded plastic product. Therefore, a motor housing H, which is made of a metallic material, can be electrically insulated from the sensing board 110 of the eccentricity measuring part 100.

[0032] Furthermore, the detection housing 200 can include a board insertion groove 231, which is concave so that the detection board 110 is inserted into the board insertion groove 231, and interference contour avoidance grooves 232, which are concave in cylindrical shapes based on vertices of the board insertion groove 231. The board insertion groove 231 can be formed to have the same thickness as the detection board 110 or to be deeper than the detection board 110. In addition, the interference contour avoidance grooves 232 can be formed at the respective vertices of the board insertion groove 231. Because the board insertion groove 231 is included, the detection board 110 can be fully inserted into the detection housing 200 without protruding from any outer surface of the detection housing 200.Since the interference contour avoidance grooves 232 are also included, the detection board 110 can be more easily inserted into the board insertion groove 231.

[0033] Furthermore, the sensor fixing section 230 can include housing coupling sections 234 that are coupled to the motor housing H, which contains the stator S and the rotor R. The housing coupling section 234 can include screw holes 234a formed by the sensor fixing 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 sensing housing 200 and be inserted into the motor housing H. At least one screw hole 234a can be formed in each of the sensor fixing sections 230, projecting radially outward. Therefore, the positions of the sensor fixing sections 230, to which the eccentricity measuring sensors 120 are applied, can be kept constant, further improving the accuracy of the eccentricity measurement.

[0034] Furthermore, as in Fig. Figure 6 shows that the detection housing 200 comprises a protection stage section 250 formed along an edge of the detection housing 200 and having an axial extension height equal to or greater than the height of the eccentricity measuring sensor 120. The protection stage section 250 can be formed along an edge region that excludes an area adjacent to the aforementioned external connection. Since the protection stage section 250 is formed to have a height equal to or greater than the height of the eccentricity measuring sensor 120, the protection stage section 250 can protect the eccentricity measuring sensor 120 even if the eccentricity measuring sensor 120 is extended in the axial direction.

[0035] Furthermore, as in Fig. Figure 7 shows that the sensing housing 200 further comprises a flat, plate-like potting element 233, which is configured to cover and protect a surface of the sensing board 110 and is provided within the containment section 250. The potting element 233 is formed to have a height equal to or greater than the height of the eccentricity measuring sensor 120, including a sensing port 121. The potting element 233 can be made of epoxy or silicone. The potting element 233 can fill the interior of the containment section 250 while covering the entire eccentricity measuring element 100. Therefore, even when a wired sensor with a sensing port extending in an axial direction is used, the position and structure of the eccentricity measuring sensor 120 can be supported by the potting element 233, thus ensuring stability.Furthermore, the eccentricity measurement sensor 120 and the sensing board 110 can be protected even in a harsh environment, thus improving the use of the eccentricity measurement system 1000.

[0036] Furthermore, for example, the eccentricity measuring element 100 is pre-inserted into a mold for injection molding the sensing housing 200, and the eccentricity measuring element 100 can be manufactured together with the sensing housing 200 by insert molding. In this case, a material that can be injection molded at a low temperature can be applied to the sensing housing 200, taking into account the heat resistance of the eccentricity measuring element 100. For example, a dough-like molding compound (BMC; Bulk Molding Compound) can be used as a material for the sensing housing 200. By applying the present embodiment, the eccentricity measuring system 1000 of the present disclosure can be used even in harsh environments, thereby improving the utilization of the eccentricity measuring system 1000.

[0037] Furthermore, as in Fig. As shown in Figure 8, in a further embodiment of the sensing housing 200, the sensing housing 200 further comprises the holder 260, which has a surface that covers and protects a surface of the sensing board 110 and is provided within the protection stage section 250. The holder 260 may include sensor receiving grooves 261 that project axially to receive the eccentricity measuring sensors 120. That is, the sensor receiving grooves 261 are open on a surface of the holder 260 that is adjacent to the sensing board 110. The sensor receiving groove 261 may extend toward the other surface of the holder 260 and project by an axial height of the eccentricity measuring sensor 120. As shown in Figure 8, the sensor receiving groove 261 is located on the sensing board 110. Fig. As shown in Figure 9, the holder 260 can be mounted on the detection housing 200 and protect the eccentricity measuring part 100.

[0038] In this embodiment, the sensor receiving groove 261 can assume a multi-stage chamfered shape, in which a cross-section in a direction perpendicular to an axis has a polygonal shape. More precisely, the sensor receiving groove 261 can be formed in a shape suitable for the shape of the eccentricity measuring sensor 120. Therefore, the eccentricity measuring sensors 120 and the sensor receiving grooves 261 can be in surface contact with each other, so that the eccentricity measuring sensors 120 can be supported more stably. In addition, a stepped section having a predetermined height can project from an edge section of a surface of the holder 260. In this case, the height of the step section can be the same thickness as the sensing board 110 or higher than the sensing board 110. Therefore, the holder 260 can be adjacent to both the sensing board 110 and the sensing housing 200, and the position of the holder 260 can be supported more stably.

[0039] Since the holder 260 is included as described above, the position of the eccentricity measuring sensor 120 can be stably supported even if the sensing port 121 is deformed or a gap is formed between the sensing port 121, the power supply port 141a and the signal output port 142a, because the eccentricity measuring sensor 120 is extended in the axial direction.

[0040] Furthermore, as in Fig. As shown in Figure 10, the sensing housing 200 further comprises at least one locking section 270 configured to fix the position of the holder 260. More precisely, the locking section 270 can comprise a column 271 projecting axially from an edge of the sensing housing 200, and a locking step section projecting radially from a distal end of the column 271 and configured to abut the other surface of the holder 260.

[0041] The locking section 270 can be formed on one edge of the central fixing section 220 of the sensing housing 200. The column 271 can be formed such that it has a thickness and height that allows it to be easily bent in the radial direction. The column 271 can be extended to the outside edge of the central fixing section 220 of the sensing housing 200 before the holder 260 is mounted. After the holder 260 is mounted and connected, the column 271 can be returned to its original shape, and the locking section can be adjacent to the other surface of the holder 260 to fix the position of the holder 260.

[0042] Furthermore, as in Fig. As shown in Figure 11, the housing coupling section 234 includes a fixing step section 234b, which is placed on a coupling structure of a bearing B of the motor housing H. Because of the fixing step section 234b, the axial position of the sensing housing 200 can be fixed. A radial position of the sensing housing 200 can be maintained by the aforementioned center hole 210. Therefore, even when the motor rotates at high speed, the position of the sensing housing 200 can be fixed more stably, further improving the accuracy of the eccentricity measurement.

[0043] The following describes in more detail the coupling relationship between the eccentricity measuring element and the detection housing of the present disclosure with reference to Fig. Described in sections 12 to 13.

[0044] Furthermore, as in Fig. As shown in Figure 12, the sensing board 110 further comprises first fixing holes 111 that are formed penetrating in an area that excludes the area in which the circuit pattern 140 is formed. The first fixing holes 111 can be formed such that they avoid the circuit pattern 140 without affecting the electrical connection between the eccentricity measuring sensors 120, the external terminal 130, and the external control. For this purpose, the first fixing holes 111 can be formed such that they are spaced differently from the center. That is, d1 and d2 in Fig. 12 can be different from each other.

[0045] Furthermore, as in Fig. As shown in Figure 13, the sensing housing 200 includes a cover 240, which is provided on the entire surface and is configured to cover the sensing board 110. The cover 240 may include second fixing holes 241, which are formed penetrating at positions corresponding to the first fixing holes 111. In this case, fasteners can be inserted into the first fixing holes 111 and the second fixing holes 241, and the positions of the first fixing holes 111 and the positions of the second fixing holes 241 can be fixed. Because the cover 240 is included, the eccentricity measuring system 1000 of the present disclosure can be used even in a harsh environment, thereby improving the usability of the eccentricity measuring system 1000.

[0046] Embodiments of an arrangement of the eccentricity measuring sensor 120 of the present disclosure are described in more detail below with reference to Fig. Described in sections 14 to 16.

[0047] As in Fig. 14 and Fig. As shown in Figure 15, two or more eccentricity measuring sensors 120 can be arranged on the sensing board 110, one eccentricity measuring sensor 120 can be embedded in each of the sensor fixing sections 230, and the eccentricity measuring sensors 120 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 Fig. Figure 14 shows that if 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 if four eccentricity measuring sensors 120 are used, the eccentricity measuring sensors 120 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 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 rotational axis of the rotor R.

[0048] Furthermore, as in Fig. Figure 16 shows that two or more eccentricity measuring sensors 120 can be arranged on the sensing board 110. One eccentricity measuring sensor 120 can be embedded in each of the sensor fixing sections 230, and the eccentricity measuring sensors 120 can be arranged so 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.

[0049] 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 Fig. Described in sections 17 to 24.

[0050] 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 tilted 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 furthest from the eccentricity sensor 120 can decrease. That is, the total magnetic flux can change.

[0051] More precisely, if eccentricity is in a left / right direction in Fig. 17. An aspect is measured in which the magnetic flux increases at only one end (R1) or the other (R2) of the rotor R, and decreases at the other (R1) or the other (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, it can be determined that the lower end (R2) of the rotor is inclined towards the eccentricity sensor 120.

[0052] Furthermore, if an eccentricity in an upward / downward direction is present in Fig. 17 occurs when 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.

[0053] As in Fig. As shown in Figure 18, if 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 approaches or moves away from the eccentricity measuring sensor 120, so that the amount of magnetic flux can increase or decrease.

[0054] 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.

[0055] 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), both the upper end R1 and the lower end R2 of the rotor R approach or move away from the eccentricity sensor 120 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 120 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 120 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.

[0056] Furthermore, as in Fig. Figure 20 shows that if 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, as the rotor R approaches the eccentricity sensor 120, 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 120 in the opposite direction, the amount of magnetic flux can decrease at the same time that the cycle of the magnetic flux increases.

[0057] Furthermore, as in Fig. Figure 21 shows that if 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 furthest from the eccentricity measuring sensor 120 decreases. That is, the total magnetic flux can change.

[0058] For example, if a first eccentricity sensor 120A and a second eccentricity sensor 120B 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 120A and the second eccentricity sensor 120B, 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 120A or 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.

[0059] Furthermore, as in Fig. Figure 22 shows that if 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 furthest from the eccentricity measuring sensor 120 decreases, and the magnetic flux amount on another side remains constant.For example, if the first eccentricity measuring sensor 120A and the second eccentricity measuring sensor 120B 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 120B, the magnetic flux magnitude at the first eccentricity measuring sensor 120A may be partially smaller than a reference value, and the magnetic flux magnitude at the second eccentricity measuring sensor 120B may be partially larger than the reference value.

[0060] Furthermore, as in Fig. Figure 23 shows that if 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., 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 120 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 120A and the second eccentricity measuring sensor 120B 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 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.

[0061] Furthermore, as in Fig.Figure 24 shows that if 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 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 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 120A and the second eccentricity sensor 120B can be formed in opposite directions and differ from the reference value in magnetic flux amount and cycle.

[0062] 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.

[0063] The eccentricity measuring system of the present disclosure can comprise the eccentricity measuring sensor, which is mounted in the motor and configured to measure the tilting eccentricity, static eccentricity, and 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, 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 similar factors after product durability tests or after prolonged operation of the vehicle.to identify a problem in advance and take preventative measures such as repairs.

[0064] 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 it is difficult to detect the condition of an individual rotary device due to external vibration or noise. Therefore, the eccentricity measurement system can be used to proactively detect and address problems in the electric motor used in urban air mobility (UAM) aircraft.

[0065] 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. Description of the reference symbols 1000 eccentricity measurement system 100 eccentricity measuring part 110 Acquisition board 111 First fixing hole 120 eccentricity measuring sensor 121 Data acquisition port 130 External connection 140 circuit patterns 141 Power supply line 141a Power supply connection 142 Signal line 142a Signal output connector 200 detection housings 210 center hole 220 Central fixing section 230 Sensor fixing section 231 PCB insertion groove 232 Interference contour avoidance groove 233 Potting compound 234 Housing coupling section 234a Screw hole 234b Fixing stage section 240 coverage 241 Second fixing hole 250 protection level section 260 holders 261 sensor images 270 Locking section 271 Column 272 Locking stage section 120A First eccentricity measurement sensor 120B Second eccentricity measurement sensor S Stator R Rotor R1 Top end of the rotor R2 Lower end of the rotor 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]

Images