JP2008002391A - Balance correcting device and balance correcting method of electric supercharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately correct the balance of an electric supercharger. <P>SOLUTION: A PC executes a program including a step S100 rotating a rotary shaft to predetermined target rotation speed in a state that surroundings of a compressor wheel and a turbine wheel are covered by covers, a step S102 measuring vibration, a step S104 stopping rotation, a step 108 calculating an unbalance quantity and a phase if vibration is not in a tolerance range (No in S106), and a step S110 correcting an unbalance state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a balance correction device and a balance correction method for an electric supercharger, and more particularly to a balance correction device and a balance correction method having a configuration that can easily reach a target rotational speed for detecting a balance state.

  2. Description of the Related Art Conventionally, in order to improve the output of an engine, a supercharger that supercharges air supplied to the engine by compressing the air by rotation of a compressor wheel is known. An electric supercharger that applies a rotational force to a compressor wheel by a rotating electric machine is known. In such an electric supercharger, the rotating shaft is provided with a rotor. The rotating shaft rotates until it reaches a very high rotation, so if the rotating shaft is in an unbalanced state, the amplitude of vibration due to unbalance is very large compared to a normal turbocharger without a rotor. There is a possibility. Therefore, it becomes necessary to correct the unbalance of the rotating shaft.

  As a device for adjusting the balance of a rotating electrical machine, for example, JP-A-2-231957 (Patent Document 1) assumes that the adjustment of the rotation balance is in line with actual use, and a rotation balance adjustment device that improves the adjustment accuracy. Disclose. This rotation balance adjusting device rotates the rotor portion of the motor, analyzes the vibration of the base due to the rotation, and adjusts the rotation balance of the rotor portion. The rotation balance adjusting device includes a motor support unit that is integrated with a base and mounts the entire motor, and the rotor unit is rotated by energizing the mounted motor itself.

According to the rotation balance adjusting device disclosed in this publication, the motor is rotated in exactly the same situation as it is actually used. Therefore, the adjustment of the rotation balance is in line with actual use. Accuracy is improved.
JP-A-2-231957

  However, the rotating electrical machine used for the electric supercharger assists the rotation of the turbine wheel that receives the exhaust energy, and does not use an unnecessarily powerful rotating electrical machine. Therefore, when the turbine wheel and the compressor wheel are rotated by the rotating electrical machine alone to correct the imbalance in a state where the turbine wheel is not subjected to exhaust energy, the load caused by the turbine wheel and the compressor wheel flowing air is reduced. Due to the influence, it may be difficult to increase the rotational speed of the electric supercharger up to the high rotational speed necessary to detect the unbalanced state.

  In the rotational balance adjusting device disclosed in the above-mentioned publication, it is quite difficult to increase the rotational speed to the high rotational speed necessary for detecting the unbalanced state due to the rotational load of the turbine wheel or the compressor wheel. Not considered. For this reason, the above-described problems cannot be solved.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a balance correction device and a balance correction method for an electric supercharger that accurately perform balance correction of the electric supercharger. That is.

  An electric supercharger balance correcting device according to a first aspect of the invention corrects an unbalanced state of a rotating shaft of an electric supercharger. A compressor wheel and a turbine wheel are provided at both ends of the rotating shaft. The electric supercharger includes a rotating electrical machine that includes a rotor fixed to the rotating shaft and a stator fixed to the casing of the electric supercharger. The balance correction device includes a means for supplying electric power to the stator of the electric supercharger to rotate the rotating shaft in a state where the periphery of the compressor wheel and the turbine wheel is covered with a cover, and an unrotating of the rotating shaft. Detection means for detecting the balance amount and correction means for correcting the unbalanced state of the rotor based on the detected unbalance amount.

  According to the first invention, when the periphery of the compressor wheel and the turbine wheel is covered with the cover, power is supplied to the stator of the electric supercharger and the rotating shaft is rotated, the compressor wheel and the turbine wheel are supplied. Inflow and discharge of air are suppressed. Therefore, even if the rotating shaft rotates, the load due to the rotation of the compressor wheel and the turbine wheel is reduced. As a result, the rotational speed of the rotating shaft can be increased higher. Thereby, it is possible to easily reach the target rotational speed. Therefore, it is possible to detect the unbalance amount in the actual use rotation speed region in the electric supercharger and correct the rotor unbalance state based on the detected unbalance amount. Therefore, the accuracy of the balance correction of the rotating shaft is improved. Therefore, it is possible to provide an electric supercharger balance correction device that accurately corrects the balance of the electric supercharger.

  In addition to the configuration of the first invention, the balance correcting device for the electric supercharger according to the second invention further includes means for supplying electric power to the stator so as to fix the rotational position of the rotor. The correcting means includes means for correcting the unbalanced state of the rotor while the rotor is fixed at a predetermined position.

  According to the second invention, for example, when correcting the unbalanced state of the rotating shaft by cutting a part of the components of the rotating shaft, the rotor is fixed at a predetermined rotational position, An insertion position of a cutting member (for example, an end mill) inserted through the cover at the time of cutting can be fixed within a predetermined range. Therefore, the area of the through hole formed in the cover can be reduced. Thereby, when the rotor is rotated, the inflow amount or outflow amount of air from the through hole is reduced. Therefore, the load caused by the rotation of the compressor wheel and the turbine wheel is reduced. Therefore, it is possible to easily reach the target rotational speed for detecting the unbalanced state.

  In the balance correction device for an electric supercharger according to the third aspect of the invention, in addition to the configuration of the second aspect of the invention, the correction means is arranged at the rotational position where the rotor is fixed based on the detected unbalance amount. A calculating means for calculating a corresponding cutting amount; and a cutting means for correcting a rotor unbalanced state by cutting a part of a component of the rotating shaft with a cutting member based on the calculated cutting amount; including.

  According to the third invention, in the case of correcting the unbalanced state of the rotor by cutting a part of the components of the rotating shaft, the rotor is fixed at a predetermined rotational position, thereby cutting the rotor. The insertion position of a cutting member (for example, an end mill) that is sometimes inserted through the cover can be fixed within a predetermined range. Furthermore, by calculating the cutting amount corresponding to the insertion position based on the detected unbalance amount, the position where the cutting member is inserted can be further fixed at a predetermined position. That is, since the through-hole formed in the cover only needs to allow at least the cutting member to pass therethrough, the area of the through-hole can be further reduced. Therefore, the amount of inflow or outflow of air from the through hole when the rotor is rotated is reduced. Thereby, even if a rotating shaft rotates, the load by rotation of a compressor wheel and a turbine wheel is reduced. Therefore, it is possible to easily reach the target rotational speed for detecting the unbalanced state.

  In the balance adjusting device for an electric supercharger according to the fourth invention, in addition to the configuration of the third invention, the cover has a through hole through which the cutting member passes and an opening in a part around the rotation shaft. It is formed.

  According to the fourth aspect of the invention, for example, if the unbalanced state of the rotating shaft is corrected by cutting a part of the components of the rotating shaft, cutting powder or the like may adhere to the bearing portion of the rotating shaft by cutting. There is sex. If cutting powder adheres to the bearing portion, the bearing portion may be damaged, and the performance of the electric supercharger may be reduced. Therefore, by forming the opening in a part around the rotation axis of the cover, the cutting powder can be discharged by sucking the cutting powder generated by cutting from the opening. Therefore, it is possible to suppress a decrease in performance of the electric supercharger. By providing a through hole in the cover, the cutting member can be brought into contact with the rotating shaft.

  In the balance correction device for an electric supercharger according to the fifth aspect of the invention, in addition to the configuration of the fourth aspect of the invention, a mechanism that can be opened and closed is provided in the opening and the through hole.

  According to the fifth aspect of the invention, when the opening and the through hole are closed, the cover suppresses the inflow and discharge of air to the compressor wheel and the turbine wheel. Therefore, even if the rotating shaft rotates, the load due to the rotation of the compressor wheel and the turbine wheel is reduced. Therefore, it becomes possible to raise the rotation speed of a rotating shaft more. Therefore, it is possible to easily reach the target rotational speed for detecting the unbalanced state. On the other hand, when the opening and the through hole are opened, the cutting member (for example, end mill) can be brought into contact with the rotating shaft, and the cutting powder generated by cutting is sucked from the opening. Cutting powder can be discharged. Therefore, it is possible to suppress a decrease in performance of the electric supercharger.

  In the balance correcting apparatus for an electric supercharger according to the sixth invention, in addition to the configuration of any one of the first to fifth inventions, the detecting means detects a displacement amount in a direction perpendicular to the rotation axis of the rotating shaft. Including displacement detection means. The displacement detection means is provided at both ends of the rotating shaft and is supported by the cover.

  According to the sixth aspect of the present invention, the amount of displacement in the direction perpendicular to the rotation axis of the rotation shaft is detected at both ends of the rotation shaft, so that the rotation shaft is unaffected by the natural frequency of the electric supercharger. The balance amount can be accurately detected.

  In the electric turbocharger balance correcting apparatus according to the seventh invention, in addition to the configuration of any one of the first to fifth inventions, the detecting means is a vibration detecting means for detecting the vibration generated in the electric supercharger. including. The vibration detection means is provided in the casing of the electric supercharger.

  According to the seventh aspect, by detecting the vibration generated in the electric supercharger, it is possible to accurately detect the unbalance amount of the rotating shaft without directly providing a detecting device on the rotating shaft.

  An electric supercharger balance correction method according to an eighth aspect of the invention corrects an unbalanced state of a rotating shaft of the electric supercharger. A compressor wheel and a turbine wheel are provided at both ends of the rotating shaft. The electric supercharger includes a rotating electrical machine that includes a rotor fixed to the rotating shaft and a stator fixed to the casing of the electric supercharger. This balance correction method includes the steps of supplying electric power to the stator of the electric supercharger with the periphery of the compressor wheel and the turbine wheel covered with a cover to rotate the rotating shaft, and the unbalanced amount of the rotating shaft. And a correction step of correcting the unbalanced state of the rotor based on the detected unbalance amount.

  According to the eighth aspect of the invention, when the compressor wheel and the turbine wheel are respectively covered with the cover and the electric power is supplied to the stator of the electric supercharger and the rotating shaft is rotated, the compressor wheel and the turbine wheel are supplied. Inflow and discharge of air are suppressed. Therefore, even if the rotating shaft rotates, the load due to the rotation of the compressor wheel and the turbine wheel is reduced. As a result, the rotational speed of the rotating shaft can be increased higher. Thereby, it is possible to easily reach the target rotational speed. Therefore, it is possible to detect the unbalance amount in the actual use rotation speed region in the electric supercharger and correct the rotor unbalance state based on the detected unbalance amount. Therefore, the accuracy of the balance correction of the rotating shaft is improved. Therefore, it is possible to provide a method for correcting the balance of the electric supercharger that accurately corrects the balance of the electric supercharger.

  In addition to the configuration of the eighth invention, the method for correcting the balance of the electric supercharger according to the ninth invention further includes the step of supplying power to the stator so as to fix the rotational position of the rotor. The correcting step includes a step of correcting the rotor imbalance in a state where the rotor is fixed at a predetermined position.

  According to the ninth invention, for example, in the case of correcting the unbalanced state of the rotating shaft by cutting a part of the components of the rotating shaft, the rotor is fixed at a predetermined rotating position, An insertion position of a cutting member (for example, an end mill) inserted through the cover at the time of cutting can be fixed within a predetermined range. Therefore, the area of the through hole formed in the cover can be reduced. Thereby, when the rotor is rotated, the inflow amount or outflow amount of air from the through hole is reduced. Therefore, the load caused by the rotation of the compressor wheel and the turbine wheel is reduced. Therefore, it is possible to easily reach the target rotational speed for detecting the unbalanced state.

  In the electric turbocharger balance correction method according to the tenth aspect of the invention, in addition to the configuration of the ninth aspect, the correction step may be performed at a fixed rotational position of the rotor based on the detected unbalance amount. A calculation step of calculating a corresponding cutting amount; and a cutting step of correcting a rotor unbalanced state by cutting a part of the components of the rotating shaft based on the calculated cutting amount.

  According to the tenth invention, in the case of correcting the unbalanced state of the rotor by cutting a part of the components of the rotating shaft, the rotor is fixed at a predetermined rotational position, thereby performing cutting. The insertion position of a cutting member (for example, an end mill) that is sometimes inserted through the cover can be fixed within a predetermined range. Furthermore, by calculating the cutting amount corresponding to the insertion position based on the detected unbalance amount, the position where the cutting member is inserted can be further fixed at a predetermined position. That is, since the through-hole formed in the cover only needs to allow at least the cutting member to pass therethrough, the area of the through-hole can be further reduced. Therefore, the amount of inflow or outflow of air from the through hole when the rotor is rotated is reduced. Thereby, even if a rotating shaft rotates, the load by rotation of a compressor wheel and a turbine wheel is reduced. Therefore, it is possible to easily reach the target rotational speed for detecting the unbalanced state.

  In the balance correction method for the electric supercharger according to the eleventh invention, in addition to the configuration of any of the eighth to tenth inventions, the detection step is provided at both ends of the rotary shaft and supported by the cover. A displacement detection step of detecting a displacement amount in a direction orthogonal to the rotation axis of the rotation shaft by the displacement detection sensor is included.

  According to the eleventh aspect of the present invention, the amount of displacement in the direction perpendicular to the rotation axis of the rotation shaft is detected at both ends of the rotation shaft, so that the rotation shaft is unaffected by the natural frequency of the electric supercharger. The balance amount can be accurately detected.

  In the electric turbocharger balance correcting method according to the twelfth aspect of the invention, in addition to the configuration of any of the eighth to tenth aspects of the invention, the detecting step includes an acceleration pickup sensor provided in the casing of the electric supercharger. Thus, a vibration detecting step for detecting vibration generated in the electric supercharger is included.

  According to the twelfth invention, by detecting the vibration generated in the electric supercharger, it is possible to accurately detect the unbalance amount of the rotating shaft without providing a detecting device directly on the rotating shaft.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

<First Embodiment>
As shown in FIG. 1, an electric supercharger balance correcting device according to the present embodiment includes an electric supercharger 216, covers 108 and 110, NC (Numerical Control) machine tools 400 and 404, and the number of rotations. A sensor 116, acceleration pickup sensors 104 and 106, a DC power supply 100, and an inverter 102 are included.

  At the time of balance correction, the electric supercharger 216 is in a state in which neither the compressor housing nor the turbine housing has been removed, or in a state in which neither has been assembled yet.

  The electric supercharger 216 at the time of balance correction includes a housing 230, a rotating shaft 210, radial bearings 222 and 224, a rotor 214, a stator 234, a thrust bearing 228, a spacer 238, a collar 232, and a compressor wheel. 206, a turbine wheel 208, and a nut 236.

  The housing 230 has a hollow cylindrical shape, and the stator 234 is fixed to the inner peripheral portion of the housing 230 by fastening bolts, for example. The stator 234 is formed with slots and teeth along a direction parallel to the rotation axis. Each tooth is provided with a coil wound in a ring shape a predetermined number of times. The rotor 214 is fixed to the rotating shaft 210 so that the outer peripheral surface thereof is at a position facing the teeth of the stator 234.

  The rotating shaft 210 is provided so as to penetrate the housing 230 along the central axis of the housing 230. The rotating shaft 210 has a shape formed integrally with the turbine wheel 208 at one end. The rotating shaft 210 and the turbine wheel 208 may be formed separately and fastened with bolts or nuts.

  The rotating shaft 210 is provided with a rotor 214, a spacer 238, a collar 232, a thrust bearing 228, and a compressor wheel 206. The rotary shaft 210 is fixed by fastening the nut 236 after the above-described components are assembled.

  The rotor 214 and the compressor wheel 206 are positioned and provided with respect to the rotation direction of the rotary shaft 210. For example, a groove shape is formed on the outer peripheral surface of the rotating shaft 210 along the axial direction, and a protrusion shape that can be fitted to the groove shape is formed on the inner peripheral surface of the rotor 214 (or the compressor wheel 206). Also good. In this way, when the rotor 214 is assembled to the rotary shaft 210, the protrusion 214 is fitted into the groove shape, whereby the rotor 214 is positioned in the rotational direction.

  The rotor 214 is provided with a permanent magnet (not shown). For example, when a two-phase AC motor is used as electric supercharger 216 in the present embodiment, rotor 214 is composed of a permanent magnet having two poles, N pole and S pole.

  The spacer 238 and the collar 232 are each formed in a hollow cylindrical shape having a predetermined length in the rotation axis direction. The inner peripheral portions of the spacer 238 and the collar 232 are formed so that the shaft portion of the rotary shaft 210 can be fitted. The spacer 238 and the collar 232 are members that limit the position of the compressor wheel 206 and the rotor 214 in the axial direction. A thrust bearing 228 is provided between the spacer 238 and the collar 232.

  The radial bearings 222 and 224 are fixed to the housing 230 so that the axis centers thereof coincide with the rotation axis. Although the fixing method is not particularly limited, for example, the radial bearings 222 and 224 are fixed by being press-fitted into predetermined positions of the housing 230, for example. The radial bearing 222 rotatably supports the shaft portion of the rotating shaft 210 on the turbine wheel 208 side. The radial bearing 224 rotatably supports the shaft portion on the compressor 206 side of the rotary shaft 210 via the spacer 238.

  Acceleration pickup sensors 104 and 106 are provided on the outer peripheral surface of the housing 230. The acceleration pickup sensors 104 and 106 are sensors that detect vibration generated in the electric supercharger 216 by detecting the acceleration of the contact portion with the electric supercharger 216. A signal indicating the acceleration detected by the acceleration pickup sensors 104 and 106 is transmitted to a PC (Personal Computer) 118. The PC 118 includes a CPU (not shown) and a memory (not shown), and executes a program based on information acquired from various sensors. The balance correction process of the electric supercharger 216 according to the present embodiment is realized by a program executed by the PC 118.

  Further, a rotation speed sensor 116 that detects the rotation speed of the rotation shaft 210 is provided on the compressor wheel 206 side of the rotation shaft 210. The rotation speed sensor 116 is provided to face any one of the shaft portion of the rotation shaft 210, the nut 236, and the compressor wheel 206, and detects the rotation speed. A signal indicating the detected number of rotations is transmitted to the PC 118.

  Power is supplied to the coil wound around the stator 234 from the DC power supply 100 via the inverter 102. The inverter 102 converts DC power supplied from the DC power supply 100 into AC power. The PC 118 controls the amount of power supplied to the coil wound around the stator 234 via the inverter 102.

  Further, in the present embodiment, a cover 108 that covers the periphery of the compressor wheel 206 is provided on the compressor side of the electric supercharger 216. A cover 110 that covers the periphery of the turbine wheel 208 is provided on the turbine side of the electric supercharger 216.

  The materials of the covers 108 and 110 are not particularly limited as long as the materials are rigid so that the shape does not change even when the compressor wheel 206 and the turbine wheel 208 rotate, even when the pressure of the generated air changes. However, for example, it may be formed of metal or resin.

  The cover 108 is formed so as to cover the entire circumference of the compressor wheel 206 excluding the housing 230 side. The cover 110 is formed so as to cover the entire circumference of the turbine wheel 208 except for the housing 230 side. Openings 268 and 270 are formed in parts of the covers 108 and 110 around the rotation axis, respectively. The shape of the openings 268 and 270 formed around the rotation axis is not particularly limited, and may be, for example, a rectangular shape, an ellipse, or a circular shape.

  Further, the covers 108 and 110 are each formed with a through hole penetrating in the axial direction. FIG. 2 shows the appearance of the cover 108 as viewed from the direction of arrow A in FIG.

  As shown in FIG. 2, the cover 108 has a cylindrical shape when viewed from the axial direction. A circular through hole 264 having a predetermined radius is formed at the axial center of the cover 108. The radius of the through hole 264 is not particularly limited as long as the end mill 402 can be brought into contact with the entire circumference of the nut 236 when the end mill 402 provided in the NC machine tool 400 is inserted.

  The cover 110 is similarly provided with a through hole 266 at the center of the axis. The detailed description will not be repeated.

  When the NC machine tool 400 receives the control signal from the PC 118, the NC machine tool 400 operates the end mill 402 to cut a part of the nut 236. Similarly, for the NC machine tool 404, when the control signal of the PC 118 is received, the end mill 406 is operated to cut a part of the turbine wheel 208.

  Next, the configuration and operation of the electric supercharger 216 mounted on the engine (not shown) will be described. As shown in FIG. 3, the electric supercharger 216 mounted on the engine is provided with a compressor housing 302 and a turbine housing 304 at both ends in the rotation axis direction of the housing 230.

  The compressor housing 302 is formed with an opening in the direction of the rotation axis, and air from the air cleaner is introduced into the compressor housing 302. Further, around the rotation axis of the compressor housing 302, the other end of the intake passage whose one end is connected to an intercooler (not shown) is connected. That is, as the rotating shaft 210 rotates, the air flowing in from the air cleaner is compressed and sent to the intercooler.

  Around the rotating shaft of the turbine housing 304, the other end of the exhaust passage whose one end is connected to an exhaust manifold (not shown) is connected. The turbine housing 304 is connected to the other end of an exhaust pipe in which an opening is formed in the rotation axis direction and one end is connected to the catalyst.

  When the electric supercharger 216 having the above-described configuration is operated, after the air mixed with fuel is burned in the engine, the exhaust gas is guided into the turbine housing 304 from the exhaust passage. The exhaust gas then rotates the turbine wheel 208 and its rotational force is transmitted to the rotating shaft 210. Thereafter, the exhaust gas flows through the exhaust pipe and is guided to the catalyst. The exhaust gas led to the catalyst is discharged out of the vehicle in a purified state.

  On the other hand, air sucked from outside the vehicle to be supplied to the engine is filtered by an air cleaner, then flows through the intake passage and is guided into the compressor housing 302. The air is compressed (supercharged) by a compressor wheel 206 that rotates integrally with the rotary shaft 210. The compressed air is guided to the intercooler, and is sucked into the combustion chamber through the intake passage of the engine in a cooled state.

  Further, when the air compressed in the compressor housing 302 does not reach a desired boost pressure in the low engine speed range (for example, when the engine speed is equal to or lower than a predetermined engine speed). By supplying electric power to the coil wound around the stator 234, the rotary shaft 210 is rotated, and the supercharging pressure in the compressor housing 302 is controlled to be forcibly increased.

  In such an electric supercharger 216, the unbalanced state of the rotating shaft 210 is corrected by the balance correcting device before being mounted on the engine. For example, as shown in FIG. 4, a target for detecting the unbalance amount of the rotational speed of the rotating shaft 210 with the supplied air pressure by feeding air into the turbine housing 304 with the compressor housing 302 removed. It is conceivable that after increasing the rotational speed, the unbalance amount is detected and the components of the rotating shaft 210 are cut according to the detected unbalance amount. However, since the rotating shaft 210 on the turbine wheel 208 side is covered by the turbine housing 304, balance correction can be performed only by cutting components (for example, nuts 236) on the compressor wheel 206 side. Therefore, it may take a long time to correct the balance. Furthermore, since the turbine wheel 208 side is covered with the turbine housing 304, balance correction on the turbine wheel 208 side cannot be performed. Therefore, when correction cannot be made with only the components on the compressor wheel 206 side, it is necessary to reassemble the rotor 214 again.

  Further, it is conceivable to increase the number of rotations of the rotary shaft 210 by supplying electric power to the coil wound around the stator 234 with the compressor housing 302 and the turbine housing 304 removed, as described above. The rotational speed of the electric supercharger 216 obtained by supplying power to the coil corresponds to the low rotational speed region of the engine. The actual use rotational speed region of the electric supercharger 216 is higher than the rotational speed region where the rotational force is applied by supplying power to the coil. For this reason, it may be difficult to raise the rotating shaft 210 to the target rotational speed for detecting the unbalance amount by supplying power to the coil.

  Therefore, in the present invention, power is supplied to the stator 234 of the electric supercharger 216 in a state where the periphery of the compressor wheel 206 and the turbine wheel 208 is covered with the covers 108 and 110, respectively, and the rotary shaft 210 is predetermined. It is characterized in that the PC 118 detects the unbalance amount by rotating to the target rotational speed.

  Hereinafter, with reference to FIG. 5, a balance correction procedure in the balance correction device of electric supercharger 216 according to the present embodiment will be described. Note that the unbalance amount detection and balance correction of the electric supercharger 216 are performed by fixing the electric supercharger 216 to a fixed base or the like, and attaching covers 108 and 110 around the compressor wheel 206 and the turbine wheel 208, respectively. It shall be carried out in the state. The covers 108 and 110 only need to be attached when the unbalance amount is detected. That is, the attachment of the covers 108 and 110 may be performed before the balance correction, or may be included in the balance correction procedure.

  In step (hereinafter referred to as “S”) 100, PC 118 controls the electric power supplied to stator 234 so that the rotational speed of rotating shaft 210 increases to a predetermined target rotational speed. The PC 118 controls the electric power supplied to the stator 234 via the inverter 102 so that the rotational speed of the rotary shaft 210 detected by the rotational speed sensor 116 is maintained at the target rotational speed. The predetermined target rotation speed is not particularly limited as long as it is the rotation speed in the actual use rotation speed region of the electric supercharger 216 and can be reached by supplying power to the stator 234. .

  In S102, PC 118 measures the vibration generated in housing 230 by acceleration pickup sensors 104 and 106. Specifically, the PC 118 acquires time-series changes in acceleration detected by the acceleration pickup sensors 104 and 106, respectively. The PC 118 calculates vibration characteristics such as intensity or frequency based on the acquired time-series change in acceleration, and detects the balance state when the rotating shaft 210 rotates. The PC 118 continues to measure vibration until a predetermined time has elapsed since the measurement was started.

  In S104, PC 118 controls the electric power supplied to stator 234 via inverter 102 so that rotation of rotating shaft 210 stops.

  In S106, PC 118 determines whether or not the measured vibration is within an allowable range. For example, the PC 118 may determine that the vibration measured by the acceleration pickup sensors 104 and 106 is equal to or less than a predetermined strength, and that the vibration is within an allowable range. If the vibration frequency is in a predetermined frequency band, it may be determined that the vibration is within the allowable range (or is not within the allowable range). If the vibration is within the allowable range (YES in S106), this process ends. If not (NO in S106), the process proceeds to S108.

  In S108, PC 118 calculates the unbalance amount and phase. The PC 118 analyzes the balance state during the rotation of the rotary shaft 210 based on the vibration characteristics measured by the acceleration pickup sensors 104 and 106, and calculates the unbalance amount and phase. For example, the PC 118 calculates the unbalance amount of the rotating shaft 210 based on the maximum value of the vibration intensity (amplitude) measured by the acceleration pickup sensors 104 and 106. Further, the PC 118 calculates the phase based on the rotation angle when the intensity of vibration becomes maximum. Note that the rotation angle of the rotor 214 may be detected using, for example, a resolver. Further, for example, the PC 118 preliminarily adapts the relationship between the vibration characteristics, the unbalance amount and the phase (for example, a map, a table, a mathematical expression, etc.), and calculates the unbalance amount and the phase based on the measured vibration characteristics. You may make it do.

  In S110, PC 118 performs balance correction. Specifically, based on the calculated unbalance amount and phase, the position and amount of cutting of the rotary shaft 210 are determined. The cutting position is determined as at least one of the compressor wheel 206 and the turbine wheel 208 of the rotating shaft 210. For example, when the unbalance amount is relatively large, both ends of the rotating shaft 210 are determined as cutting positions. Further, when the unbalance amount is relatively small, either one of both end portions of the rotating shaft 210 is determined as the cutting position. The relationship between the calculated unbalance amount and phase, the cutting position and the cutting amount is adapted in advance through experiments or the like, and is not particularly limited.

  When the cutting position and the cutting amount are determined, the PC 118 transmits a control signal to the NC machine tools 400 and 404. The NC machine tools 400 and 404 cut a part of the rotary shaft 210 by the determined cutting amount at the determined cutting position based on the received control signal. In the present embodiment, for example, a part of the shaft portion of the nut 236 and the turbine wheel 208 is cut when the end mills 402 and 406 come into contact. In particular, the components to be cut are the nut 236 and the turbine. The shaft portion of the wheel 208 is not limited. The cutting powder generated by the cutting is sucked from the openings 268 and 270 formed in the covers 108 and 110.

  The operation of the balance correction device for electric supercharger 216 according to the present embodiment based on the above-described structure and flowchart will be described.

  The electric supercharger 216 is fixed to a fixed base or the like in a state where the compressor housing 302 and the turbine housing 304 are not attached (or removed). Further, covers 108 and 110 covering the periphery of the compressor wheel 206 and the turbine wheel 208 are attached. In such a state, the balance of the rotating shaft 210 is corrected. That is, AC power is supplied to the electric supercharger 216 from the DC power source 100 via the inverter 102. In response to the supply of AC power to the stator 234, the rotational speed of the rotating shaft 210 increases.

  At this time, since the covers 108 and 110 are provided on both end sides in the axial direction of the housing 230, the rotation of the rotating shaft 210 and the rotation of the compressor wheel 206 and the turbine wheel 208 are performed by the covers 108 and 110. Inflow and outflow of air to the compressor wheel 206 and the turbine wheel 208 are suppressed. Therefore, since the rotational load due to the rotation of the compressor wheel 206 and the turbine wheel 208 is reduced, the rotational speed of the rotary shaft 210 increases rapidly as compared with the case where the covers 108 and 110 are not provided.

  When the rotational speed of the rotary shaft 210 detected by the rotational speed sensor 116 becomes equal to or higher than a predetermined target rotational speed (S100), vibration measurement is started by the acceleration pickup sensors 104 and 106 (S102). Then, after the vibration measurement is performed until a predetermined time elapses, the rotation of the rotating shaft 210 is stopped (S104).

  If the measured vibration is within the allowable range (YES in S106), the balance correction process of electric supercharger 216 ends. On the other hand, if the measured vibration is not within the allowable range (NO in S106), an unbalance amount and a phase are calculated based on the measured vibration characteristics (S108).

  Then, the unbalanced state of the rotating shaft 210 is corrected based on the calculated unbalance amount and phase (S110). At this time, when the cutting position and the cutting amount are determined based on the unbalance amount and the phase, the nut 236 or the turbine wheel 208 of the rotary shaft 210 is determined at the cutting position determined by the NC machine tools 400 and 404. It is cut by the cutting amount. At this time, a part of the parts constituting the rotary shaft 210 is cut by the contact between the end mills 402 and 406, and the balance state of the rotary shaft 210 changes. Further, cutting powder generated by the cutting is sucked from openings 268 and 270 formed in the covers 108 and 110.

  Then, power is again supplied to the stator 234, and the rotating shaft 210 starts to rotate. When the rotation speed detected by the rotation speed sensor 116 is equal to or higher than a predetermined target rotation speed (S100), vibration measurement is started by the acceleration pickup sensors 104 and 106 (S102). After the vibration measurement is performed until a predetermined time elapses, the rotation of the electric supercharger 216 is stopped (S104). If the measured vibration is within the allowable range (YES in S106), the balance correction process of electric supercharger 216 ends.

  As described above, the electric turbocharger balance correction apparatus according to the present embodiment supplies electric power to the stator of the electric supercharger in a state where the periphery of the compressor wheel and the turbine wheel is covered with the cover. Thus, when the rotary shaft is rotated, the inflow and discharge of air to the compressor wheel and the turbine wheel are suppressed. Therefore, even if the rotating shaft rotates, the load due to the rotation of the compressor wheel and the turbine wheel is reduced. Therefore, it becomes possible to raise the rotation speed of a rotating shaft more. Therefore, the target rotational speed can be easily reached. Therefore, with the compressor housing and the turbine housing removed, the unbalance amount in the actual use rotation speed region of the electric supercharger is detected, and the unbalance state of the rotor is corrected based on the detected unbalance amount. be able to. That is, since the balance correction can be achieved by cutting both ends of the rotary shaft, the accuracy of the balance correction of the rotary shaft is improved. Therefore, it is possible to provide an electric supercharger balance correction device that accurately corrects the balance of the electric supercharger.

  Further, by detecting vibration generated in the electric supercharger using the acceleration pickup sensor, it is possible to accurately detect the unbalance amount of the rotating shaft without providing a detecting device directly on the rotating shaft.

  Preferably, the cover is preferably provided with a lid member, for example, as a mechanism for opening and closing the opening and the through hole. In this way, when detecting the unbalance amount, the load due to the rotation of the compressor wheel and the turbine wheel is reduced by closing the lid member so as to close the opening and the through hole, and the rotation shaft The rotational speed can be easily reached to the target rotational speed. At the time of balance correction, the end mill can be inserted by opening the lid member so that the through hole penetrates, and the cutting powder generated by cutting can be removed by opening the lid member so that the opening portion opens. The cutting powder can be discharged by suction or the like.

<Second Embodiment>
Hereinafter, the balance correction apparatus for the electric supercharger according to the second embodiment will be described. The balance correction apparatus for the electric supercharger according to the present embodiment is replaced with the acceleration pickup sensors 104 and 106 as compared with the configuration of the balance correction apparatus for the electric supercharger 216 according to the first embodiment described above. The difference is that the displacement detection sensors 112 and 114 are provided and that the rotary shaft 210 is included instead of the rotary shaft 210. About another structure, it is the same structure as the structure of the balance correction apparatus of the electric supercharger 216 which concerns on 1st Embodiment mentioned above. They are given the same reference numerals. Their functions are the same. Therefore, detailed description thereof will not be repeated here.

  In the present embodiment, as shown in FIG. 6, a cylindrical projection 240 is formed at the end of the rotating shaft 310 on the turbine side. Further, the compressor-side end of the rotating shaft 310 has a shape that is longer in the axial direction than the rotating shaft 210 of the electric supercharger according to the first embodiment described above. The rotating shaft 310 has the same structure as the rotating shaft 210 except that the protrusion 240 is formed and the end on the compressor side is long in the axial direction. Therefore, detailed description thereof will not be repeated.

  Furthermore, the displacement detection sensors 112 and 114 are provided so as to penetrate the covers 108 and 110 from the direction orthogonal to the rotation axis. The displacement detection sensor 112 is provided so as to face the outer peripheral surface of the cylindrical protrusion 240 of the rotary shaft 310 described above. The displacement detection sensor 112 detects the distance from the protrusion 240, that is, the amount of displacement of the protrusion 240 in the direction orthogonal to the rotation axis, and transmits the detected amount of displacement to the signal PC118.

  The displacement detection sensor 114 is provided so as to face the outer peripheral surface of the shaft portion at the compressor side end. The displacement detection sensor 114 detects the distance from the shaft portion of the rotating shaft 310, that is, the amount of displacement of the shaft portion in the direction orthogonal to the rotation axis, and transmits a signal representing the detected amount of displacement to the PC 118.

  When the vibration of the housing 230 is detected by the acceleration pickup sensor, if the unbalanced state of the rotating shaft 310 is detected, the amplitude increases due to resonance at the natural frequency, and thus there is a possibility that the unbalanced state cannot be detected accurately. is there.

  As shown in FIG. 7, the vicinity of 50,000 revolutions is the natural frequency in the electric supercharger 216, and therefore, there is a possibility that the unbalanced state of the rotating shaft 310 cannot be detected accurately around this revolution number.

  Therefore, in the present embodiment, the displacement detection sensor detects a displacement amount in a direction orthogonal to the rotation axis at both ends of the rotation shaft 310, and rotates based on the unbalance amount calculated from the detected displacement amount. It is characterized in that the balance state of the shaft 310 is corrected.

  Note that the balance correction procedure in the balance correction device for the electric supercharger according to the present embodiment is different from the flowchart described with reference to FIG. 5 except that the vibration measurement is performed by the displacement detection sensor. Are the same. Therefore, detailed description thereof will not be repeated.

  The operation of the balance correction device for electric supercharger 216 according to the present embodiment based on the above-described structure and flowchart will be described.

  The electric supercharger 216 is fixed to a fixed base or the like in a state where the compressor housing 302 and the turbine housing 304 are not attached (or removed). Further, covers 108 and 110 covering the periphery of the compressor wheel 206 and the turbine wheel 208 are attached. In such a state, the balance of the rotating shaft 310 is corrected. That is, AC power is supplied to the electric supercharger 216 from the DC power source 100 via the inverter 102. In response to the supply of AC power to the stator 234, the rotational speed of the rotating shaft 310 increases.

  At this time, since the covers 108 and 110 are provided on both end sides in the axial direction of the housing 230, the rotation of the rotating shaft 310 and the rotation of the compressor wheel 206 and the turbine wheel 208 are performed by the covers 108 and 110. Inflow and outflow of air to the compressor wheel 206 and the turbine wheel 208 are suppressed. Therefore, since the rotational load due to the rotation of the compressor wheel 206 and the turbine wheel 208 is reduced, the rotational speed of the rotary shaft 310 increases rapidly as compared with the case where the covers 108 and 110 are not provided.

  When the rotational speed of the rotary shaft 310 detected by the rotational speed sensor 116 becomes equal to or higher than a predetermined target rotational speed (S100), vibration measurement is started by the displacement detection sensors 112 and 114 (S102). Then, after the vibration measurement is performed until a predetermined time elapses, the rotation of the rotating shaft 310 is stopped (S104).

  If the measured vibration is within the allowable range (YES in S106), the balance correction process of electric supercharger 216 ends. On the other hand, if the measured vibration is not within the allowable range (NO in S106), an unbalance amount and a phase are calculated based on the measured vibration characteristics (S108).

  Then, the unbalanced state of the rotating shaft 310 is corrected based on the calculated unbalance amount and phase (S110). At this time, when the cutting position and the cutting amount are determined based on the unbalance amount and the phase, the nut 236 or the turbine wheel 208 of the rotary shaft 310 is determined at the cutting position determined by the NC machine tools 400 and 404. It is cut by the cutting amount. At this time, a part of the parts constituting the rotary shaft 310 is cut by the contact between the end mills 402 and 406, and the balance state of the rotary shaft 310 changes. Further, cutting powder generated by the cutting is sucked from openings 268 and 270 formed in the covers 108 and 110.

  Then, power is again supplied to the stator 234, and the rotating shaft 310 starts to rotate. When the rotation speed detected by the rotation speed sensor 116 becomes equal to or higher than a predetermined target rotation speed (S100), vibration measurement is started by the displacement detection sensors 112 and 114 (S102). After the vibration measurement is performed until a predetermined time elapses, the rotation of the electric supercharger 216 is stopped (S104). If the measured vibration is within the allowable range (YES in S106), the balance correction process of electric supercharger 216 ends.

  As described above, according to the balance correcting apparatus for the electric supercharger according to the present embodiment, the displacement is added to the effect exhibited in the balance correcting apparatus for the electric supercharger according to the first embodiment described above. By detecting the unbalance of the rotation of the rotating shaft with the detection sensor, the balance state of the rotating shaft can be accurately determined without being affected by the natural frequency of the electric supercharger, compared with the case where the acceleration pickup sensor is used. Can be detected.

<Third Embodiment>
Hereinafter, the balance correction apparatus for the electric supercharger according to the third embodiment will be described. Compared with the configuration of the balance correction device of the electric supercharger 216 according to the first embodiment described above, the balance correction device for the electric supercharger according to the present embodiment is a cover through which the end mills 402 and 406 penetrate. The shapes of the through holes 264 and 266 of the 108 and 110 are different. About another structure, it is the same structure as the structure of the balance correction apparatus of the electric supercharger 216 which concerns on 1st Embodiment mentioned above. They are given the same reference numerals. Their functions are the same. Therefore, detailed description thereof will not be repeated here.

  As shown in FIG. 8, in the balance correcting device for the electric supercharger 216 according to the present embodiment, the shapes of the through holes 264 and 266 into which the end mills 402 of the covers 108 and 110 are inserted are the shapes of the rotating shaft 210. It has a fan shape having an inner angle of 90 degrees around the rotation axis.

  The present embodiment is characterized in that the PC 118 controls electric power supplied to the stator 234 via the inverter 102 so as to fix the rotor 214 at a predetermined rotational position.

  Specifically, after raising the rotor 214 to a predetermined target rotational speed, the unbalance amount is calculated, and when the cutting position and the cutting amount are determined based on the calculated unbalance amount, Electric power is supplied to the stator 234 so that the rotational position of the rotor 214 is fixed so that the end mills 402 and 406 can come into contact with the determined cutting position from the through holes 264 and 266.

  In the present embodiment, the rotating electrical machine provided in electric supercharger 216 is a two-phase AC motor. The rotor 214 has two magnetic poles, an N pole and an S pole.

  As shown in FIG. 9A, the coil 250 wound around the tooth 242 located in the upper direction of the paper than the rotor 214 expresses the magnetic force of the south pole, and is located in the lower side of the paper than the rotor 214. When electric power is supplied to the stator 234 so that the coil 254 wound around the tooth 246 develops an N-pole magnetic force, the N-pole of the rotor 214 faces the teeth 242 and the S-pole of the rotor 214 becomes teeth. The position is fixed by the magnetic force developed at the position opposite to H.246.

  In the present embodiment, fan-shaped through holes 264 and 266 having an inner angle of 90 degrees are formed between the teeth 242 and the teeth 252 in the covers 108 and 110, respectively. Therefore, when the end mills 402 and 406 are inserted into the through holes 264 and 266, the end mills 402 and 406 can contact the circumferential surface from the point D to the point A at one end of the rotating shaft 210. Become.

  As shown in FIG. 9B, the coil 252 wound around the tooth 244 located in the right direction of the paper with respect to the rotor 214 expresses the magnetic force of the S pole, and is located in the left direction of the paper with respect to the rotor 214. When electric power is supplied to the stator 234 so that the coil 256 wound around the tooth 248 develops an N-pole magnetic force, the N-pole of the rotor 214 is opposed to the tooth 244 and the S-pole of the rotor 214 is the teeth. The position is fixed by the magnetic force developed at the position facing 248.

  At this time, when the end mills 402 and 406 are inserted into the through holes 264 and 266, the end mills 402 and 406 can contact the circumferential surface from the point A to the point B of the rotary shaft 210. The rotation position of the rotor 214 in FIG. 9B is a position obtained by rotating the rotor 214 shown in FIG. 9A by 90 degrees clockwise on the paper surface.

  As shown in FIG. 9C, the coil 254 wound around the tooth 246, which is positioned lower than the rotor 214 in the drawing, expresses the magnetic force of the south pole, and is positioned higher than the rotor 214 in the drawing. When electric power is supplied to the stator 234 so that the coil 250 wound around the teeth 242 develops N-pole magnetic force, the N-pole of the rotor 214 faces the teeth 246, and the S-pole of the rotor 214 is set to the teeth 242. The position is fixed by the magnetic force developed at the position opposite to.

  At this time, when the end mills 402 and 406 are inserted into the through holes 264 and 266, the end mills 402 and 406 can contact the circumferential surface from the point B to the point C of the rotating shaft 210. The rotation position of the rotor 214 in FIG. 9C is a position where the rotor 214 shown in FIG. 9B is rotated by 90 degrees clockwise on the paper surface.

  As shown in FIG. 9D, the coil 256 wound around the tooth 248 that is located on the left side of the paper with respect to the rotor 214 expresses the magnetic force of the south pole, and is located on the right side of the paper with respect to the rotor 214. When electric power is supplied to the stator 234 so that the coil 252 wound around the teeth 244 develops an N-pole magnetic force, the N-pole of the rotor 214 is opposed to the teeth 248 and the S-pole of the rotor 214 is the teeth. The position is fixed by the magnetic force developed at the position facing 244.

  At this time, when the end mills 402 and 406 are inserted into the through holes 264 and 266, the end mills 402 and 406 can contact the circumferential surface from the point C to the point D of the rotating shaft 210. The rotational position of the rotor 214 in FIG. 9D is a position obtained by rotating the rotor 214 shown in FIG. 9C by 90 degrees clockwise on the paper surface.

  Hereinafter, with reference to FIG. 10, the balance correction procedure in the balance correction device of electric supercharger 216 according to the present embodiment will be described.

  In the flowchart shown in FIG. 10, the same steps as those in the flowchart described with reference to FIG. The processing is the same for them. Therefore, detailed description thereof will not be repeated here.

  In S200, PC 118 calculates the rotor lock phase. For example, the PC 118 calculates the rotor lock phase based on the unbalance amount and phase calculated in S108.

  Specifically, for example, when the point A in FIG. 9 is set as the reference position of the rotor 214, it is calculated how many times the cutting position is rotated from the reference position. Then, based on the calculated rotational position, any one of the lock positions in FIG. 9A to FIG. 9D is set. For example, if the cutting position is between point A and point D, the positional relationship between the rotor 214 and the stator 234 shown in FIG. 9A is set as the rotor lock position.

  In S202, PC 118 controls the electric power supplied to stator 234 via inverter 102 so that rotor 214 is fixed at the set rotor lock position.

  In S204, the PC 118 performs unbalance correction. Specifically, the cutting position is determined when the rotor lock phase is calculated in S200, and the PC 118 determines the cutting amount based on the calculated unbalance amount.

  The relationship between the calculated unbalance amount and phase, the cutting position, and the cutting amount is adapted in advance through experiments or the like, and is not particularly limited.

  When the cutting position and the cutting amount are determined, the PC 118 transmits a control signal to the NC machine tools 400 and 404. The NC machine tools 400 and 404 cut a part of the rotary shaft 210 by the determined cutting amount at the determined cutting position based on the received control signal. In the present embodiment, for example, a part of the shaft portion of the nut 236 and the turbine wheel 208 is cut when the end mills 402 and 406 come into contact. In particular, the components to be cut are the nut 236 and the turbine. The shaft portion of the wheel 208 is not limited. Cutting powder generated by the cutting is sucked from openings 268 and 270 formed in the covers 108 and 110.

  The operation of the balance correction device for electric supercharger 216 according to the present embodiment based on the configuration and flowchart as described above will be described.

  The electric supercharger 216 is fixed to a fixed base or the like in a state where the compressor housing 302 and the turbine housing 304 are not attached (or removed). Further, covers 108 and 110 covering the periphery of the compressor wheel 206 and the turbine wheel 208 are attached. In such a state, the balance of the rotating shaft 210 is corrected. That is, AC power is supplied to the electric supercharger 216 from the DC power source 100 via the inverter 102. In response to the supply of AC power to the stator 234, the rotational speed of the rotating shaft 210 increases.

  At this time, since the covers 108 and 110 are provided on both end sides in the axial direction of the housing 230, the rotation of the rotating shaft 210 and the rotation of the compressor wheel 206 and the turbine wheel 208 are performed by the covers 108 and 110. Inflow and outflow of air to the compressor wheel 206 and the turbine wheel 208 are suppressed. Therefore, since the rotational load due to the rotation of the compressor wheel 206 and the turbine wheel 208 is reduced, the rotational speed of the rotary shaft 210 increases rapidly as compared with the case where the covers 108 and 110 are not provided.

  Further, in the present embodiment, the opening area is about 4 minutes compared to the through holes 264 and 266 of the covers 108 and 110 of the balance correction device for the electric supercharger according to the first embodiment described above. 1 Accordingly, the inflow and outflow of air to the compressor wheel 206 and the turbine wheel 208 are further suppressed. Therefore, the rotational load can be further reduced.

  When the rotational speed of the rotary shaft 210 detected by the rotational speed sensor 116 becomes equal to or higher than a predetermined target rotational speed (S100), vibration measurement is started by the acceleration pickup sensors 104 and 106 (S102). Then, after the vibration measurement is performed until a predetermined time elapses, the rotation of the rotating shaft 210 is stopped (S104).

  If the measured vibration is within the allowable range (YES in S106), the balance correction process of electric supercharger 216 ends. On the other hand, if the measured vibration is not within the allowable range (NO in S106), an unbalance amount and a phase are calculated based on the measured vibration (S108).

  Then, the rotor lock position is set based on the calculated unbalance amount and phase (S200). When the rotor lock position is set, the PC 118 controls the electric power supplied to the stator 234 via the inverter 102 so that the rotor 214 rotates to the set lock position (S202). The unbalance is corrected based on the cutting position and the cutting amount determined based on the unbalance amount and phase (S204). At this time, a part of the components of the rotating shaft 210 is cut when the end mills 402 and 406 come into contact with each other based on the determined cutting position and cutting amount, and the balance state of the rotating shaft 210 changes. Further, cutting powder generated by the cutting is sucked from openings 268 and 270 formed in the covers 108 and 110.

  Then, power is again supplied to the stator 234, and the rotating shaft 210 starts to rotate. When the rotation speed detected by the rotation speed sensor 116 is equal to or higher than a predetermined target rotation speed (S100), vibration measurement is started by the acceleration pickup sensors 104 and 106 (S102). After the vibration measurement is performed until a predetermined time elapses, the rotation of the electric supercharger 216 is stopped (S104). If the measured vibration is within the allowable range (YES in S106), the balance correction process of electric supercharger 216 ends.

  As described above, according to the balance correcting apparatus for the electric supercharger according to the present embodiment, in addition to the effects that are manifested in the balance correcting apparatus for the electric supercharger according to the first embodiment described above, By enabling the rotation shaft to be fixed every 90 degrees, the end mill can be brought into contact with the entire circumference even if the through hole has a fan shape having an inner angle of 90 degrees with the rotation axis as the center. Therefore, the through area of the through hole can be reduced. Therefore, when the unbalance amount is detected, the outflow amount and the inflow amount of air in the through hole when the rotary shaft is rotated can be reduced. Therefore, the load on the compressor wheel and the turbine wheel can be reduced. Therefore, the rotating shaft can be easily raised to the target rotational speed.

  Further, it is not necessary to move the NC machine tools 400 and 404 with respect to the rotary shaft 210 so as to be able to contact the entire circumference. Simplification of equipment as a balance correction device is achieved. Thereby, an increase in cost can be suppressed.

  In the present embodiment, the electric supercharger provided with the two-phase rotating electric machine has been described as an example, but the present invention is not particularly limited thereto. For example, a rotating electric machine having two or more phases may be used. For example, in an electric supercharger provided with a two-phase rotating electrical machine, the rotating shaft can be fixed every 60 degrees. Therefore, even if the shape of the through hole is formed in a fan shape having an inner angle of 60 degrees around the rotation axis, the end mill can be brought into contact with the entire circumference of the rotation shaft. Therefore, the area of the through hole can be further reduced.

<Fourth embodiment>
Hereinafter, the balance correction apparatus of the electric supercharger according to the fourth embodiment will be described. Compared to the configuration of the electric turbocharger balance correction device according to the first embodiment described above, the balance correction device for the electric supercharger according to the present embodiment is a cover 108 through which the end mills 402 and 406 pass. 110, the shapes of the through holes 264, 266 are different. About another structure, it is the same structure as the structure of the balance correction apparatus of the electric supercharger which concerns on 1st Embodiment mentioned above. They are given the same reference numerals. Their functions are the same. Therefore, detailed description thereof will not be repeated here.

  As shown in FIG. 11, in the electric turbocharger balance correcting apparatus according to the present embodiment, the shapes of the through holes 264 and 266 into which the end mills 402 and 406 of the covers 108 and 110 are inserted are from the axial center. It is a circular shape provided at a position separated by a predetermined distance and having a diameter that is at least larger than the diameter of the end mills 402 and 406.

  The present embodiment is characterized in that the electric power supplied to the stator 234 via the inverter 102 is controlled so that the PC 118 is fixed at a predetermined rotational position of the rotor 214.

  Specifically, the PC 118 calculates the unbalance amount after controlling the rotor 214 to increase to a predetermined target rotational speed. The PC 118 determines the cutting position and the cutting amount based on the calculated unbalance amount. The PC 118 converts the cutting amount at the determined cutting position into cutting amounts at a plurality of predetermined positions that are contacted by the end mills 402 and 406 from the through holes 264 and 266. PC 118 controls the electric power supplied to stator 234 so that the rotational position of rotor 214 is fixed at a plurality of predetermined positions.

  In the present embodiment, the rotating electrical machine provided in electric supercharger 216 is a two-phase AC motor. The rotor 214 has two magnetic poles, an N pole and an S pole.

  As shown in FIG. 12 (A), the coil 250 wound around the tooth 242 located in the upper direction of the paper than the rotor 214 expresses the magnetic force of the south pole, and is located in the lower side of the paper than the rotor 214. When electric power is supplied to the stator 234 so that the coil 254 wound around the tooth 246 develops an N-pole magnetic force, the N-pole of the rotor 214 faces the teeth 242 and the S-pole of the rotor 214 becomes teeth. The position facing 246 is fixed as the cutting position (1) of the rotating shaft 210.

  In the present embodiment, the covers 108 and 110 are positions where the angle between the teeth 242 and the teeth 252 and the straight line connecting the teeth 242 and the shaft center is α, which is determined in advance from the shaft center. Through holes 264 and 266 are respectively formed at the determined distances.

  At this time, in FIG. 12A, when the end mills 402 and 406 are inserted into the through holes 264 and 266, they contact the circumferential surface at a predetermined position from the point A to the point D of the rotating shaft 210. Is possible.

  As shown in FIG. 12 (B), the coil 252 wound around the tooth 244 located on the right side of the paper with respect to the rotor 214 expresses the magnetic force of the south pole, and the tooth located on the left side of the paper with respect to the rotor 214. When power is supplied to the stator 234 so that the coil 256 wound around the H.248 exerts N-pole magnetic force, the N-pole of the rotor 214 faces the teeth 244, and the S-pole of the rotor 214 becomes the teeth 248. Is fixed as a cutting position (2) of the rotary shaft 210.

  At this time, in FIG. 12B, when the end mills 402 and 406 are inserted into the through holes 264 and 266, they contact the circumferential surface at a predetermined position from the point A to the point B of the rotating shaft 210. Is possible.

  As shown in FIG. 12C, the coil 254 wound around the tooth 246 positioned below the rotor 214 in the paper surface expresses the magnetic force of the south pole, and the tooth 242 positioned above the rotor 214 in the paper surface. When power is supplied to the stator 234 so that the coil 250 wound around the rotor 250 develops an N-pole magnetic force, the N-pole of the rotor 214 faces the teeth 246, and the S-pole of the rotor 214 becomes the teeth 242. The facing position is fixed as the cutting position (3) of the rotating shaft 210.

  At this time, in FIG. 12C, when the end mills 402 and 406 are inserted into the through holes 264 and 266, they contact the circumferential surface at a predetermined position between the point B and the point C of the rotating shaft 210. Is possible.

  As shown in FIG. 12D, the coil 256 wound around the tooth 248 located on the left side of the paper with respect to the rotor 214 expresses the magnetic force of the south pole, and the tooth 244 located on the right side of the paper with respect to the rotor 214. When electric power is supplied to the stator 234 so that the coil 252 wound around the rotor 252 develops an N-pole magnetic force, the N-pole of the rotor 214 faces the teeth 248, and the S-pole of the rotor 214 becomes the teeth 244. The facing position is fixed as the cutting position (4) of the rotating shaft 210.

  At this time, in FIG. 12D, when the end mills 402 and 406 are inserted into the through holes 264 and 266, they contact the circumferential surface at a predetermined position from the point C to the point D of the rotating shaft 210. Is possible.

  As shown in FIG. 13, the cutting position determined based on the unbalance amount is between point A and point D of the rotary shaft 210, and is a position moved from the point D by 15 degrees along the circumference ( Hereinafter, it is referred to as point E). Further, it is assumed that the cutting amount is determined to be 50 mg. In FIG. 13, the horizontal direction on the paper surface is the x axis, and the vertical direction on the paper surface is the y axis.

  In the present embodiment, as shown in FIG. 14, the PC 118 vector-converts the cutting amount at point E into cutting amounts at point F on the cutting position (1) axis and point G on the cutting position (2) axis. . In addition, as for F point and G point, the end mills 402 and 406 are inserted from the through holes 264 and 266 when the rotating shaft 210 is fixed at any of the cutting positions in FIGS. It is a position where contact is possible.

  As shown in FIG. 15, the angle formed by the cutting position (1) axis and the straight line connecting the point E and the axis center is 30 degrees. The angle formed by the cutting position (2) axis and the straight line connecting the point E and the axis center is 60 degrees. Therefore, the 50 mg cutting amount at point E is vector-converted into the cutting position (1) axis and the cutting position (2) axis, and the cutting amount of 43.3 mg at the cutting position (1) and 25 mg at the cutting position (2). It is divided into the amount of cutting.

  That is, when the rotary shaft 210 is fixed at the cutting position (1), 43.3 mg is cut at the above-mentioned point F, and when the rotary shaft 210 is fixed at the cutting position (2), the above-mentioned point G Is cut by 25 mg.

  Hereinafter, with reference to FIG. 16, a balance correction procedure in the balance correction device of electric supercharger 216 according to the present embodiment will be described.

  In the flowchart shown in FIG. 16, the same steps as those in the flowchart described with reference to FIG. The processing is the same for them. Therefore, detailed description thereof will not be repeated here.

  In S300, the PC 118 converts the cutting amount corresponding to the calculated unbalance amount into a vector in order to calculate the cutting amount corresponding to any two adjacent positions among the cutting positions (1) to (4). To do. Since details are as described with reference to FIGS. 13 to 15, detailed description thereof will not be repeated.

  In S302, PC 118 performs rotor lock (1). That is, the PC 118 controls the electric power supplied to the stator 234 so that the rotor 214 is fixed at one of the two converted cutting positions. For example, if the determined cutting position is point E shown in FIG. 13, the vector is converted into the cutting amount at the cutting position (1) and the cutting position (2). ).

  In S304, the PC 118 performs unbalance correction. Specifically, the NC machine tools 400 and 404 are controlled so as to cut by the converted cutting amount. The end mills 402 and 406 are cut by contacting the circumferential surface of the rotor 214. Cutting powder generated by the cutting is sucked from openings 268 and 270 formed in the covers 108 and 110.

  In S306, the PC 118 performs the rotor lock (2). That is, the PC 118 controls the electric power supplied to the stator 234 so that the rotor 214 is fixed to the other of the two converted cutting positions. For example, if the determined cutting position is point E shown in FIG. 13, the rotating shaft 210 is fixed at the cutting position (2).

  In S308, the PC 118 performs unbalance correction. Specifically, the NC machine tools 400 and 404 are controlled so as to cut by the converted cutting amount. The end mills 402 and 406 are cut by contacting the circumferential surface of the rotor 214. Cutting powder generated after cutting is sucked from openings 268 and 270 formed in the covers 108 and 110.

  The operation of the balance correction device for electric supercharger 216 according to the present embodiment based on the above-described structure and flowchart will be described.

  The electric supercharger 216 is fixed to a fixed base or the like in a state where the compressor housing 302 and the turbine housing 304 are not attached (or removed). Further, covers 108 and 110 covering the periphery of the compressor wheel 206 and the turbine wheel 208 are attached. In such a state, the balance of the rotating shaft 210 is corrected. That is, AC power is supplied to the electric supercharger 216 from the DC power source 100 via the inverter 102. In response to the supply of AC power to the stator 234, the rotational speed of the rotating shaft 210 increases.

  At this time, since the covers 108 and 110 are provided on both end sides in the axial direction of the housing 230, the rotation of the rotating shaft 210 and the rotation of the compressor wheel 206 and the turbine wheel 208 are performed by the covers 108 and 110. Inflow and outflow of air to the compressor wheel 206 and the turbine wheel 208 are suppressed. Therefore, since the rotational load due to the rotation of the compressor wheel 206 and the turbine wheel 208 is reduced, the rotational speed of the rotary shaft 210 increases rapidly as compared with the case where the covers 108 and 110 are not provided.

  Further, in the present embodiment, the through area is small as compared to the through holes 264 and 266 of the covers 108 and 110 of the balance correction device for the electric supercharger according to the first embodiment described above. Accordingly, the inflow and outflow of air to the compressor wheel 206 and the turbine wheel 208 are further suppressed. Therefore, the rotational load can be further reduced.

  When the rotational speed of the rotary shaft 210 detected by the rotational speed sensor 116 becomes equal to or higher than a predetermined target rotational speed (S100), vibration measurement is started by the acceleration pickup sensors 104 and 106 (S102). Then, after the vibration measurement is performed until a predetermined time elapses, the rotation of the rotating shaft 210 is stopped (104).

  If the measured vibration is within the allowable range (YES in S106), the balance correction process of electric supercharger 216 ends. On the other hand, if the measured vibration is not within the allowable range (NO in S106), an unbalance amount and a phase are calculated based on the measured vibration (S108).

  The cutting amount based on the calculated unbalance amount and phase is calculated by vector conversion of cutting amounts corresponding to two adjacent cutting positions among the cutting positions (1) to (4) (S300). The rotor 214 is fixed at one of the two cutting positions (S302). The balance state of the rotary shaft 210 is changed by cutting the vector-converted cutting amount at the fixed cutting position (S304). Cutting powder generated after cutting is sucked from openings 268 and 270 formed in the covers 108 and 110.

  Further, the rotor 214 is fixed to the other of the two cutting positions (S306). The balance state of the rotary shaft 210 is further changed by cutting the vector-converted cutting amount at the fixed cutting position.

  Then, power is again supplied to the stator 234, and the rotating shaft 210 starts to rotate. When the rotation speed detected by the rotation speed sensor 116 is equal to or higher than a predetermined target rotation speed (S100), vibration measurement is started by the acceleration pickup sensors 104 and 106 (S102). After the vibration measurement is performed until a predetermined time elapses, the rotation of the electric supercharger 216 is stopped (S104). If the measured vibration is within the allowable range (YES in S106), the balance correction process of electric supercharger 216 ends.

  As described above, according to the balance correcting apparatus for the electric supercharger according to the present embodiment, in addition to the effects that are manifested in the balance correcting apparatus for the electric supercharger according to the first embodiment described above, The size of the through hole formed in the cover can be reduced by fixing the rotating shaft every 90 degrees and further vector-converting the cutting position. Therefore, when calculating the unbalance amount, the outflow amount and the inflow amount of air in the through hole when the rotary shaft is rotated can be reduced. Therefore, the load on the compressor wheel and the turbine wheel can be reduced. Therefore, the rotating shaft can be easily raised to the target rotational speed.

  Further, it is not necessary to move the NC machine tools 400 and 404 with respect to the rotary shaft 210 so as to be able to contact the entire circumference. Simplification of equipment as a balance correction device is achieved. Thereby, an increase in cost can be suppressed.

  In the present embodiment, the electric supercharger provided with the two-phase rotating electric machine has been described as an example, but the present invention is not particularly limited thereto. For example, a rotating electric machine having two or more phases may be used.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows the structure of the balance correction apparatus of the electric supercharger which concerns on 1st Embodiment. It is a figure which shows the external appearance of the cover seen from arrow A. It is a figure which shows the structure of the electric supercharger mounted in the engine. It is a figure which shows the structure of the balance correction apparatus which supplies air to a turbine. It is a flowchart which shows the procedure of the balance correction of the electric supercharger in 1st Embodiment. It is a figure which shows the structure of the balance correction apparatus of the electric supercharger which concerns on 2nd Embodiment. It is a figure which shows the relationship between the rotation speed in an electric supercharger, and the amplitude of a vibration. It is a figure which shows the external appearance of the cover in 3rd Embodiment. It is a figure which shows the fixing position of the rotor in 3rd Embodiment. It is a flowchart which shows the procedure of the balance correction of the electric supercharger which concerns on 3rd Embodiment. It is a figure which shows the external appearance of the cover in 4th Embodiment. It is a figure which shows the fixing position of the rotor in 4th Embodiment. It is FIG. (1) for demonstrating vector conversion of a cutting position and a cutting amount. It is FIG. (2) for demonstrating vector conversion of a cutting position and a cutting amount. It is FIG. (3) for demonstrating vector conversion of a cutting position and a cutting amount. It is a flowchart which shows the procedure of the balance correction of the electric supercharger which concerns on 4th Embodiment.

Explanation of symbols

  100 DC power supply, 102 inverter, 104, 106 acceleration pickup sensor, 108, 110 cover, 112, 114 displacement detection sensor, 116 rotation speed sensor, 118 PC, 206 compressor wheel, 208 turbine wheel, 210, 310 rotating shaft, 214 rotor 216 Electric supercharger, 222,224 Radial bearing, 228 Thrust bearing, 230 Housing, 232 Collar, 234 Stator, 236 Nut, 238 Spacer, 242,244,246,248 Teeth, 250,252,254,256 Coil, 264, 266 Through hole, 268, 270 Opening, 400, 404 NC machine tool, 402, 406 End mill.

Claims (12)

A balance correcting device for correcting an unbalanced state of a rotating shaft of an electric supercharger, wherein a compressor wheel and a turbine wheel are provided at both ends of the rotating shaft, and the electric supercharger is connected to the rotating shaft. A rotating electric machine composed of a rotor fixed to the stator and a stator fixed to the casing of the electric supercharger,
Means for supplying electric power to a stator of the electric supercharger and rotating the rotating shaft in a state where the periphery of the compressor wheel and the turbine wheel is covered with a cover,
Detecting means for detecting an unbalance amount of the rotating shaft;
A balance correcting device for an electric supercharger, comprising: correcting means for correcting an unbalanced state of the rotor based on the detected unbalance amount. The balance correction device further includes means for supplying power to the stator to fix the rotational position of the rotor,
The balance correction of the electric supercharger according to claim 1, wherein the correction means includes means for correcting an unbalanced state of the rotor in a state where the rotor is fixed at a predetermined position. apparatus. The correcting means is
Calculation means for calculating a cutting amount corresponding to a fixed rotational position of the rotor based on the detected unbalance amount;
The electric motor according to claim 2, further comprising: cutting means for correcting a unbalanced state of the rotor by cutting a part of the components of the rotating shaft with a cutting member based on the calculated cutting amount. Supercharger balance correction device.   The balance correction apparatus for an electric supercharger according to claim 3, wherein the cover is formed with a through-hole through which the cutting member passes and an opening at a part around the rotation axis.   The balance correction apparatus for an electric supercharger according to claim 4, wherein the opening and the through hole are provided with a mechanism that can be opened and closed. The detection means includes a displacement detection means for detecting a displacement amount in a direction orthogonal to the rotation axis of the rotation shaft,
The balance correction device for an electric supercharger according to any one of claims 1 to 5, wherein the displacement detection means is provided at both ends of the rotary shaft and supported by the cover. The detection means includes vibration detection means for detecting vibration generated in the electric supercharger,
The balance correction device for an electric supercharger according to any one of claims 1 to 5, wherein the vibration detection means is provided in a casing of the electric supercharger. A balance correcting method for correcting an unbalanced state of a rotating shaft of an electric supercharger, wherein a compressor wheel and a turbine wheel are provided at both ends of the rotating shaft, and the electric supercharger is connected to the rotating shaft. A rotating electric machine composed of a rotor fixed to the stator and a stator fixed to the casing of the electric supercharger,
Supplying electric power to the stator of the electric supercharger in a state where the periphery of the compressor wheel and the turbine wheel is covered with a cover, and rotating the rotating shaft;
A detection step of detecting an unbalance amount of the rotating shaft;
And a correction step of correcting the unbalanced state of the rotor based on the detected unbalance amount. The balance correction method further includes supplying power to the stator so as to fix the rotational position of the rotor,
The balance correction method of the electric supercharger according to claim 8, wherein the correction step includes a step of correcting an unbalance of the rotor in a state where the rotor is fixed at a predetermined position. The correcting step includes
A calculation step of calculating a cutting amount corresponding to a fixed rotational position of the rotor based on the detected unbalance amount;
The balance of the electric supercharger according to claim 9, further comprising a cutting step of cutting a part of a component of the rotating shaft based on the calculated cutting amount to correct an unbalanced state of the rotor. How to fix.   The detection step includes a displacement detection step of detecting a displacement amount in a direction orthogonal to a rotation axis of the rotation shaft by a displacement detection sensor provided at both ends of the rotation shaft and supported by the cover. The balance correction method of the electric supercharger in any one of 8-10.   The said detection step includes the vibration detection step which detects the vibration which arose in the said electric supercharger with the acceleration pick-up sensor provided in the housing | casing of the said electric supercharger. To correct the balance of the electric supercharger.

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