JP4702203B2 - Electric turbocharger balance correcting device and balance correcting method - Google Patents

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 for correcting an unbalanced state without disassembling the electric supercharger.

  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. For this reason, the mass is increased as compared with a rotating shaft not provided with a rotor. Further, the rotating shaft rotates until it becomes very high at the time of supercharging. For this reason, when the rotating shaft is in an unbalanced state, the amplitude of vibration due to unbalance may become very large as compared with a normal supercharger in which no rotor is provided. Therefore, it becomes necessary to correct the unbalance of the rotating shaft.

  For example, Japanese Patent Laid-Open No. 2002-39904 (Patent Document 1) discloses a turbocharger that can improve the reproducibility and correction accuracy of inspection data, reduce the number of corrections of high-speed balance, and improve the number of production. A high-speed balance correction apparatus and method are disclosed. This high-speed balance correction device picks up the acceleration of the turbocharger and has a magnet, a rotation detector that detects a high-speed unbalance amount at the time of high-speed rotation of the compressor wheel, and detected from these detectors An arithmetic unit that calculates based on an input signal and a vibration table having a turbine casing mounting plate for mounting the turbine casing are provided, and the acceleration pickup is mounted on the turbine casing mounting plate of the shaking table.

According to the high-speed balance correction device disclosed in the above-mentioned publication, the reproducibility and correction accuracy of inspection data can be improved, the number of corrections of high-speed balance can be reduced, and the number of production can be improved.
JP 2002-39904 A

  In the balance correcting device disclosed in the above-mentioned publication, the unbalanced state is corrected by cutting the nut that fixes the compressor wheel. However, in the case where the rotor is fixed to the rotating shaft like an electric supercharger, there is a possibility that the unbalanced state cannot be corrected sufficiently only by correcting the balance by cutting the nut.

  In particular, in an electric supercharger, stacking of parallelism of components such as a rotating shaft, a rotor, or a compressor wheel affects the balance state. Therefore, it is necessary to disassemble the components fixed to the rotating shaft and reassemble after the balance correction. As a result, the balance correction process may take time.

  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 apparatus and a balance correction method for correcting an unbalanced state in a short time without disassembling the electric supercharger. Is to provide.

  An electric supercharger balance correction device according to a first aspect of the invention is a balance correction device that 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 is a rotating electric machine composed of a rotor whose position around the rotation axis is fixed by a fastening force of a fastening member with respect to the rotation shaft, and a stator fixed to the casing of the electric supercharger. Including. This balance correction device supplies power to the stator to rotate the rotor, and the unbalance amount of the rotary shaft when the rotational speed of the rotary shaft is a predetermined rotational speed. Correction for correcting the unbalanced state by changing the phase between the rotating shaft and the rotor in a state where the fastening of the fastening member is loosened based on the detection means for detecting and the detected unbalance amount. Means.

  According to the first invention, the correcting means changes the phase between the rotating shaft and the rotor in a state in which the fastening member is loosened based on the detected unbalanced amount of the rotating shaft, thereby causing an unbalanced state. To correct. For example, when electric power is supplied to the stator in a state where the rotation of the rotating shaft is limited, only the rotor can be rotated. Therefore, the phase between the rotating shaft and the rotor can be changed. The unbalanced state of the rotating shaft is caused by the parallelism of components such as a rotor fixed to the rotating shaft. Therefore, by changing the phase between the rotating shaft and the rotor, the aspect of the parallelism stacking can be changed, and correction can be made to improve the unbalanced state of the rotating shaft. Further, the balance of the rotating shaft can be corrected by loosening the fastening of the fastening member without disassembling the electric supercharger. Therefore, the unbalanced state of the rotating shaft can be corrected in a shorter time compared with the case where the electric supercharger is disassembled and the balance is corrected and then reassembled. Therefore, it is possible to provide a balance correcting device that corrects the unbalanced state in a short time without disassembling the electric supercharger.

  In the balance correcting device for the electric supercharger according to the second invention, in addition to the configuration of the first invention, the correcting means rotates the motor by supplying power to the stator in a state where the rotation of the rotating shaft is limited. Means are included for correcting the unbalanced state by changing the phase between the rotating shaft and the rotor by rotating the rotor.

  According to the second invention, when electric power is supplied to the stator in a state where the rotation of the rotating shaft is restricted, only the rotor can be rotated. Therefore, the phase between the rotating shaft and the rotor can be changed. The unbalanced state of the rotating shaft is caused by the parallelism of components such as a rotor fixed to the rotating shaft. Therefore, by changing the phase between the rotating shaft and the rotor, the aspect of the parallelism stacking can be changed, and correction can be made to improve the unbalanced state of the rotating shaft. Further, the balance of the rotating shaft can be corrected by loosening the fastening of the fastening member without disassembling the electric supercharger. Therefore, the unbalanced state of the rotating shaft can be corrected in a shorter time compared with the case where the electric supercharger is disassembled and the balance is corrected and then reassembled.

  In the balance correction device for an electric supercharger according to the third invention, in addition to the configuration of the second invention, the supply means includes a plurality of predetermined phase angles in which the phase angle between the rotor and the stator is plural. Thus, means for supplying electric power to the stator in a state in which the rotation of the rotating shaft is restricted and the fastening member is loosened is included. The detecting means includes means for detecting unbalance amounts corresponding to a plurality of phase angles when the rotational speed of the rotary shaft is a predetermined rotational speed in a state where the fastening member is fastened. The correcting means is configured to limit the rotation of the rotating shaft so that the phase angle between the rotor and the stator is a phase angle corresponding to the smallest unbalance amount among a plurality of predetermined phase angles. And means for supplying power to the stator to correct the unbalanced state with the fastening member loosened.

  According to the third invention, the phase between the rotor and the stator in a state where the rotation of the rotary shaft is limited so as to be the phase angle corresponding to the smallest unbalance amount among a plurality of predetermined phase angles. The angle is adjusted. Thereby, the phase of a rotating shaft and a rotor can be changed. In particular, by setting the phase angle corresponding to the smallest unbalance amount, it is possible to change the manner of stacking parallelism so that the unbalanced state is improved.

  An electric supercharger balance correcting device according to a fourth aspect of the invention is a balance correcting device for correcting 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 rotor whose position in a direction orthogonal to the rotation axis is fixed by a fastening force of a fastening member with respect to the rotary shaft, and a stator fixed to the casing of the electric supercharger. Includes rotating electrical machinery. This balance correction device supplies power to the stator to rotate the rotor, and the unbalance amount of the rotary shaft when the rotational speed of the rotary shaft is a predetermined rotational speed. Detection means for detecting and correction means for correcting the unbalanced state by changing the clearance between the rotating shaft and the rotor in a state where the fastening of the fastening member is loosened based on the detected unbalance amount Including.

  According to the fourth invention, the correcting means changes the clearance between the rotating shaft and the rotor in a state in which the fastening member is loosened based on the detected unbalanced amount of the rotating shaft, thereby causing the unbalanced state. To correct. For example, when electric power is supplied to the stator in a state where the rotation of the rotating shaft is restricted, only the rotor can be moved in a direction orthogonal to the rotating shaft while the position of the rotating shaft is restricted. Therefore, the clearance between the rotating shaft and the rotor can be changed. The unbalanced state of the rotating shaft is caused by the parallelism of components such as a rotor fixed to the rotating shaft. Accordingly, by changing the clearance between the rotating shaft and the rotor, the aspect of the parallelism stacking can be changed, and correction can be made to improve the unbalanced state of the rotating shaft. Further, the balance of the rotating shaft can be corrected by loosening the fastening of the fastening member without disassembling the electric supercharger. Therefore, the unbalanced state of the rotating shaft can be corrected in a shorter time compared with the case where the electric supercharger is disassembled and the balance is corrected and then reassembled. Therefore, it is possible to provide a balance correcting device that corrects the unbalanced state in a short time without disassembling the electric supercharger.

  In the balance correcting apparatus for an electric supercharger according to the fifth aspect of the invention, in addition to the configuration of the fourth aspect of the invention, the rotating shaft is provided through the rotor. The correction means supplies power to the stator in a state in which the rotation of the rotating shaft is restricted, and moves the rotor in a direction perpendicular to the rotating shaft, thereby reducing the outer diameter of the rotating shaft and the inner diameter of the rotor. Means are included for changing the clearance to correct the imbalance condition.

  According to the fifth invention, when electric power is supplied to the stator in a state where the rotation of the rotating shaft is restricted, only the rotor can be moved in a direction orthogonal to the rotating shaft while the position of the rotating shaft is restricted. Therefore, the clearance between the rotating shaft and the rotor can be changed. The unbalanced state of the rotating shaft is caused by the parallelism of components such as a rotor fixed to the rotating shaft. Accordingly, by changing the clearance between the rotating shaft and the rotor, the aspect of the parallelism stacking can be changed, and correction can be made to improve the unbalanced state of the rotating shaft. Further, the balance of the rotating shaft can be corrected by loosening the fastening of the fastening member without disassembling the electric supercharger. Therefore, the unbalanced state of the rotating shaft can be corrected in a shorter time compared with the case where the electric supercharger is disassembled and the balance is corrected and then reassembled.

  In the balance correction apparatus for an electric supercharger according to the sixth invention, in addition to the configuration of the fifth invention, the rotor has two magnetic poles. The balance correction device further includes angle detection means for detecting the rotation angle of the rotor. When the detected rotation angle of the rotor is an angle at which the rotor magnetic pole boundary portion and the stator magnetic pole face each other, the boundary portion in the state where the fastening member is fastened. Includes means for supplying power to the stator so that it rotates at an angle that does not oppose the stator poles.

  According to the sixth invention, when the rotation angle of the rotor is such that the boundary portion between the magnetic poles of the rotor and the magnetic poles of the stator face each other, the magnetic force generated at the opposing magnetic poles of the stator In some cases, the rotor cannot be moved in a direction perpendicular to the rotation axis. Therefore, by rotating the rotor so that the boundary portion is at an angle that does not face the magnetic pole of the stator, the rotor can be reliably moved in the direction perpendicular to the rotation axis.

  In the balance correcting device for an electric supercharger according to the seventh invention, in addition to the configuration of any one of the first to sixth inventions, the detecting means is provided to face both ends of the rotating shaft, and the rotating shaft Displacement detecting means for detecting the amount of displacement in the direction perpendicular to the rotation axis is included.

  According to the seventh 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 eighth invention, in addition to the configuration of any one of the first to sixth inventions, the detecting means is provided in the casing of the electric supercharger, Vibration detecting means for detecting vibration generated in the machine is included.

  According to the eighth invention, by detecting 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.

  A balance correcting method for an electric supercharger according to a ninth aspect of the invention is a balance correcting method for correcting 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 is a rotating electric machine composed of a rotor whose position around the rotation axis is fixed by a fastening force of a fastening member with respect to the rotation shaft, and a stator fixed to the casing of the electric supercharger. Including. In this balance correction method, an electric power is supplied to the stator to rotate the rotor, and an unbalance amount of the rotary shaft when the rotational speed of the rotary shaft is a predetermined rotational speed is detected. A detecting step and a correcting step of correcting the unbalanced state by changing the phase of the rotating shaft and the rotor in a state where the fastening of the fastening member is loosened based on the detected unbalanced amount.

  According to the ninth invention, the correcting step changes the phase between the rotating shaft and the rotor in a state in which the fastening member is loosened based on the detected unbalanced amount of the rotating shaft, thereby causing an unbalanced state. To correct. For example, when electric power is supplied to the stator in a state where the rotation of the rotating shaft is limited, only the rotor can be rotated. Therefore, the phase between the rotating shaft and the rotor can be changed. The unbalanced state of the rotating shaft is caused by the parallelism of components such as a rotor fixed to the rotating shaft. Therefore, by changing the phase between the rotating shaft and the rotor, the aspect of the parallelism stacking can be changed, and correction can be made to improve the unbalanced state of the rotating shaft. Further, the balance of the rotating shaft can be corrected by loosening the fastening of the fastening member without disassembling the electric supercharger. Therefore, the unbalanced state of the rotating shaft can be corrected in a shorter time compared with the case where the electric supercharger is disassembled and the balance is corrected and then reassembled. Therefore, it is possible to provide a balance correction method for correcting the unbalanced state in a short time without disassembling the electric supercharger.

  In the electric turbocharger balance correction method according to the tenth aspect of the invention, in addition to the configuration of the ninth aspect of the invention, in the correction step, the rotation is performed by supplying electric power to the stator while limiting the rotation of the rotary shaft. The step of changing the phase of the rotating shaft and the rotor by rotating the rotor to correct the unbalanced state is included.

  According to the tenth invention, when electric power is supplied to the stator in a state where the rotation of the rotating shaft is restricted, only the rotor can be rotated. Therefore, the phase between the rotating shaft and the rotor can be changed. The unbalanced state of the rotating shaft is caused by the parallelism of components such as a rotor fixed to the rotating shaft. Therefore, by changing the phase between the rotating shaft and the rotor, the aspect of the parallelism stacking can be changed, and correction can be made to improve the unbalanced state of the rotating shaft. Further, the balance of the rotating shaft can be corrected by loosening the fastening of the fastening member without disassembling the electric supercharger. Therefore, the unbalanced state of the rotating shaft can be corrected in a shorter time compared with the case where the electric supercharger is disassembled and the balance is corrected and then reassembled.

  In the electric turbocharger balance correction method according to the eleventh aspect of the invention, in addition to the configuration of the tenth aspect of the invention, the supply step includes a plurality of predetermined phase angles between the rotor and the stator. Thus, the method includes the step of supplying electric power to the stator in a state in which the rotation of the rotating shaft is restricted and the fastening of the fastening member is loosened. The detecting step includes a step of respectively detecting unbalance amounts corresponding to a plurality of phase angles when the number of rotations of the rotating shaft is a predetermined number of rotations with the fastening member being fastened. The correction step includes rotating the shaft so that the phase angle between the rotor and the stator becomes a phase angle corresponding to the smallest unbalance amount detected among a plurality of predetermined phase angles. The method includes a step of supplying electric power to the stator to correct the unbalanced state in a state where the rotation of the fastening member is restricted and the fastening of the fastening member is loosened.

  According to the eleventh invention, the phase between the rotor and the stator in a state where the rotation of the rotary shaft is limited so as to be the phase angle corresponding to the smallest unbalance amount among a plurality of predetermined phase angles. The angle is adjusted. Thereby, the phase of a rotating shaft and a rotor can be changed. In particular, by setting the phase angle corresponding to the smallest unbalance amount, it is possible to change the manner of stacking parallelism so that the unbalanced state is improved.

  A balance correcting method for an electric supercharger according to a twelfth aspect of the invention is a balance correcting method for correcting 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 rotor whose position in a direction orthogonal to the rotation axis is fixed by a fastening force of a fastening member with respect to the rotary shaft, and a stator fixed to the casing of the electric supercharger. Includes rotating electrical machinery. In this balance correction method, an electric power is supplied to the stator to rotate the rotor, and an unbalance amount of the rotary shaft when the rotational speed of the rotary shaft is a predetermined rotational speed is detected. A detecting step and a correcting step of correcting the unbalanced state by changing a clearance between the rotating shaft and the rotor in a state where the fastening of the fastening member is loosened based on the detected unbalanced amount.

  According to the twelfth invention, the correcting step changes the clearance between the rotating shaft and the rotor in a state in which the fastening member is loosened based on the detected unbalanced amount of the rotating shaft, so that the unbalanced state is obtained. To correct. For example, when electric power is supplied to the stator in a state where the rotation of the rotating shaft is restricted, only the rotor can be moved in a direction orthogonal to the rotating shaft while the position of the rotating shaft is restricted. Therefore, the clearance between the rotating shaft and the rotor can be changed. The unbalanced state of the rotating shaft is caused by the parallelism of components such as a rotor fixed to the rotating shaft. Accordingly, by changing the clearance between the rotating shaft and the rotor, the aspect of the parallelism stacking can be changed, and correction can be made to improve the unbalanced state of the rotating shaft. Further, the balance of the rotating shaft can be corrected by loosening the fastening of the fastening member without disassembling the electric supercharger. Therefore, the unbalanced state of the rotating shaft can be corrected in a shorter time compared with the case where the electric supercharger is disassembled and the balance is corrected and then reassembled. Therefore, it is possible to provide a balance correction method for correcting the unbalanced state in a short time without disassembling the electric supercharger.

  In the balance correcting method for the electric supercharger according to the thirteenth invention, in addition to the configuration of the twelfth invention, the rotating shaft is provided through the rotor. In the correction step, power is supplied to the stator in a state in which the rotation of the rotating shaft is limited, and the rotor is moved in a direction perpendicular to the rotating shaft, whereby the outer diameter of the rotating shaft and the inner diameter of the rotor are reduced. The step of correcting the unbalanced state by changing the clearance between them.

  According to the thirteenth invention, when electric power is supplied to the stator in a state where the rotation of the rotating shaft is restricted, only the rotor can be moved in a direction orthogonal to the rotating shaft while the position of the rotating shaft is restricted. Therefore, the clearance between the rotating shaft and the rotor can be changed. The unbalanced state of the rotating shaft is caused by the parallelism of components such as a rotor fixed to the rotating shaft. Accordingly, by changing the clearance between the rotating shaft and the rotor, the aspect of the parallelism stacking can be changed, and correction can be made to improve the unbalanced state of the rotating shaft. Further, the balance of the rotating shaft can be corrected by loosening the fastening of the fastening member without disassembling the electric supercharger. Therefore, the unbalanced state of the rotating shaft can be corrected in a shorter time compared with the case where the electric supercharger is disassembled and the balance is corrected and then reassembled.

  In addition to the configuration of the thirteenth invention, the balance correction method for the electric supercharger according to the fourteenth invention has two magnetic poles. The balance correction method further includes an angle detection step of detecting the rotation angle of the rotor. In the supplying step, when the detected rotation angle of the rotor is an angle at which the rotor magnetic pole boundary and the stator magnetic pole face each other, the boundary portion is in a state where the fastening member is fastened. Supplying power to the stator so that it rotates at an angle that does not oppose the stator poles.

  According to the fourteenth aspect of the invention, when the rotation angle of the rotor is such that the rotor magnetic pole boundary and the stator magnetic pole face each other, the magnetic force generated by the opposing stator magnetic poles In some cases, the rotor cannot be moved in a direction perpendicular to the rotation axis. Therefore, by rotating the rotor so that the boundary portion is at an angle that does not face the magnetic pole of the stator, the rotor can be reliably moved in the direction perpendicular to the rotation axis.

  In the electric turbocharger balance correction method according to the fifteenth aspect of the invention, in addition to the configuration of any of the ninth to fourteenth aspects, the detection step includes a displacement detection provided opposite to both ends of the rotating shaft. The method includes detecting a displacement amount in a direction orthogonal to the rotation axis of the rotation shaft by the sensor.

  According to the fifteenth aspect of the present invention, the amount of displacement in the direction orthogonal 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 sixteenth aspect of the invention, in addition to the configuration of any of the ninth to fourteenth aspects of the invention, the detecting step includes an acceleration pickup sensor provided in the casing of the electric supercharger. By this, the step which detects the vibration which arose in the electric supercharger is included.

  According to the sixteenth invention, by detecting 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.

  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, the electric turbocharger balance correction apparatus according to the present embodiment includes an electric supercharger 216, covers 108 and 110, a rotation speed sensor 116, acceleration pickup sensors 104 and 106, A DC power supply 100, an inverter 102, and displacement detection sensors 112 and 114 are configured.

  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. After the components described above are assembled to the rotary shaft 210, the nut 236 is fastened to fix the position around the rotation axis and in the direction perpendicular to the rotation axis. The relative positions of the rotor 214 and the compressor wheel 206 around the rotation axis of the rotation shaft 210 are fixed by the fastening force of the nut 236. A cylindrical projection 240 is formed at the end of the rotating shaft 210 on the turbine side. The turbine wheel 208 of the rotary shaft 210 is provided with a rotation limiting device 272 that can limit the rotation of the turbine wheel 208. The rotation limiting device 272 limits the rotation of the turbine wheel 208 or cancels the rotation limitation of the turbine wheel 208 in accordance with a control signal of a PC (Personal Computer) 118 described later.

  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 rotating shaft 210 can be inserted. The spacer 238 and the collar 232 are members that limit the axial positions of the compressor wheel 206 and the rotor 214. 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 center of rotation coincides 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 supports the shaft portion of the rotary shaft 210 on the compressor wheel 206 side via a spacer 238 so as to be rotatable.

  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 the PC 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 operation of the balance correction device of electric supercharger 216 according to the present embodiment is realized by a program executed by 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.

  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 210 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 it to the signal PC 118 representing the detected amount of displacement.

  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 210, that is, the displacement amount of the shaft portion in the direction orthogonal to the rotation axis, and transmits a signal representing the detected displacement amount to the PC 118. The displacement detection sensors 112 and 114 are gap sensors, for example.

  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 (hereinafter also referred to as energization amount) 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 a metal such as duralumin or may be formed of a 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. An end mill of an NC (Numerical Control) machine tool (not shown) is inserted into the through hole, and the nut 236 or a part of the turbine wheel 208 is cut, so that the final balance adjustment after the balance correction according to the present invention is performed.

  Next, the configuration and operation of the electric supercharger 216 mounted on the engine (not shown) will be described. As shown in FIG. 2, the electric supercharger 216 mounted on the engine is provided with a compressor housing 202 and a turbine housing 204 on both ends in the rotation axis direction of the housing 230.

  The compressor housing 202 is formed with an opening in the direction of the rotation axis, and the air from the air cleaner is introduced into the compressor housing 202. Further, around the rotation axis of the compressor housing 202, the other end of an 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 204, the other end of the exhaust passage, one end of which is connected to an exhaust manifold (not shown), is connected. The turbine housing 204 is connected to the other end of the exhaust pipe in which an opening is formed in the rotation axis direction and one end is connected to the catalyst.

  During the operation of the electric supercharger 216 having the above-described configuration, after the air mixed with fuel is combusted inside the engine, the exhaust gas is guided into the turbine housing 204 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, the air taken 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 202. 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 202 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 rotation shaft 210 is rotated, and the supercharging pressure in the compressor housing 202 is controlled to be forcibly increased.

  FIG. 3 shows a supercharger 300 that does not have a rotating electrical machine. The rotating shaft 310 is rotatably supported by radial bearings 322 and 324 and a thrust bearing 328 fixed to the housing 330 of the supercharger 300. A turbine wheel 308 is integrally formed at one end of the rotating shaft 310. At the other end of the rotating shaft 310, a collar 332, a thrust bearing 328, and a compressor turbine 306 are inserted and fastened by a nut 336. A compressor housing 302 is provided on the compressor side of the supercharger 300, and a turbine housing 304 is provided on the turbine side of the supercharger 300.

  With respect to the fastening force by the nut 336, the stepped portion 350 that restricts the movement of the thrust bearing 328 to the turbine side serves as a receiving surface. By sandwiching the thrust bearing 328, the collar 332, and the compressor wheel 306 by the nut 336 and the stepped portion 350, the compressor wheel 306 is positioned with respect to the rotating shaft 310.

  In the supercharger 300 that does not have a rotating electrical machine, the components fixed to the rotating shaft 310 are concentrated on the compressor side, so that the shaft bending of the rotating shaft 310 is on the compressor side as shown by the thick line in FIG. Large and less bent on the turbine side.

  Such shaft bending of the rotating shaft 310 is caused by the unbalanced state of the rotating shaft due to the parallelism of the axial end surfaces of the compressor wheel 306 and the collar 332 as shown in FIG. 4A. .

  Therefore, the phase of the compressor wheel 306 and the rotating shaft 310 can be changed by rotating the compressor wheel 306 with the nut 336 loosened. That is, as shown in FIG. 4B, by changing the parallelism stacking mode shown in FIG. 4A, the unbalanced state of the rotating shaft 310 can be improved and the bending of the shaft can be suppressed. .

  On the other hand, returning to FIG. 2, in the electric supercharger 216, the rotor 214 is provided between the radial bearings 222 and 224 of the rotating shaft 210. For the fastening force of the nut 236, the stepped portion 280 that restricts the movement of the rotor 214 to the turbine side serves as a receiving surface. That is, the thrust wheel 228, the collar 232, the spacer 238, and the rotor 214 are sandwiched by the nut 236 and the stepped portion 280, so that the compressor wheel 206 and the rotor 214 are positioned with respect to the rotating shaft 210.

  In the electric supercharger 216 having a rotating electric machine, components fixed to the rotating shaft 210 are provided up to the turbine side. Therefore, the shaft bending of the rotating shaft 210 is large not only on the compressor side but also on the turbine side, as shown by the thick line in FIG.

  In particular, the turbine wheel 208 tends to have a larger mass than the compressor wheel 206, and even if the eccentric amount is the same, the unbalance amount of the entire rotating shaft 210 is greatly affected. Further, since the rotor 214 is eccentrically provided on the rotating shaft 210, the unbalance amount may be increased.

  Even if the phase of the compressor wheel 206 and the rotating shaft 210 is changed in order to change the manner of parallelism stacking with respect to the unbalanced state of the rotating shaft 210, the shaft bending on the compressor side is suppressed. However, it is not possible to suppress the shaft bending on the turbine side.

  In order to suppress the bending of the shaft on the turbine side, it is conceivable to change the phase of the spacer 238 or the rotor 214 and the rotating shaft 210. However, the spacer 238 and the rotor 214 are incorporated on the turbine side of the thrust bearing 228. Therefore, in order to change the phase between the spacer 238 or the rotor 214 and the rotating shaft 210, it is necessary to disassemble the electric supercharger 216.

  Therefore, the present invention corrects the unbalanced state of the rotating shaft 210 by changing the phase between the rotating shaft 210 and the rotor 214 while the nut 236 is loosened based on the unbalanced amount. It is characterized in that

  Specifically, in a state where the rotation of the rotating shaft 210 is restricted, after the nut 236 is loosened, electric power is supplied to the stator 234 and the rotor 214 rotates, whereby the rotating shaft 210 and the rotor 214 The unbalanced state is corrected by changing the phase of. The balance correction of the rotating shaft 210 is performed by the balance correction device according to the present invention before the electric supercharger 216 is mounted on the engine.

  In the present embodiment, with the nut 236 tightened, the rotational position of the rotor 214 is changed to the predetermined rotor positions (1) to (4) with respect to the stator 234, respectively. . Further, each time the position is changed, the nut 236 is fastened, and the unbalance amount of the rotating shaft 210 at the changed position is detected.

  The change of the rotor position is performed by supplying electric power to the stator 234 and rotating only the rotor 214 in a state where the rotation of the rotary shaft 210 is restricted. The unbalance amount is detected by raising the rotating shaft 210 to a predetermined number of rotations with the nut 236 being fastened. In the present embodiment, the detection of the unbalance amount is described as being performed by detecting the displacement amount in the direction orthogonal to the axis of the end of the rotary shaft 210 by the displacement detection sensors 112 and 114. However, the acceleration pickup It may be performed by detecting the vibration characteristics (for example, vibration intensity, frequency) of the housing 230 by the sensors 104 and 106, and is not particularly limited.

  In the present embodiment, as shown in FIG. 5, the rotating electrical machine provided in electric supercharger 216 includes a rotor 214, a stator 234 including teeth 242, 244, 246, 248 and coils 250, 252, 254, 256. Are two-phase AC motors. The rotor 214 has two magnetic poles, an N pole and an S pole. Further, teeth 242, 244, 246 and 248 are formed on the stator core of the stator 234. Coils 250, 252, 254, and 256 are wound around the teeth 242, 244, 246, and 248, respectively. In the present embodiment, coil 250 and coil 254 form an A-phase coil. Further, the coil 252 and the coil 256 form a B-phase coil.

  When electric power is supplied to the A-phase coils 250 and 254, as shown in FIG. 6A, the rotor 214 of the coil 250 wound around the teeth 242 located on the paper surface side of the rotor 214. Assume that the side facing the S pole is the S pole. At this time, the side facing the rotor 214 of the coil 254 wound around the tooth 246, which is positioned lower than the rotor 214 in the drawing, becomes the N pole. In this case, the rotor 214 rotates such that the N pole faces the teeth 242 and the S pole faces the teeth 246 by the formed magnetic flux flow. The relative position between the stator 234 and the rotor 214 shown in FIG. 6A is the rotor position (1).

  When electric power is supplied to the B-phase coils 252 and 256, as shown in FIG. 6B, the rotor 214 of the coil 252 wound around the teeth 244, which is positioned on the right side of the rotor 214 with respect to the paper surface. Assume that the side facing the S pole is the S pole. At this time, the side facing the rotor 214 of the coil 256 wound around the tooth 248 located on the left side of the paper with respect to the rotor 214 is an N pole. In this case, the rotor 214 rotates so that the N pole faces the teeth 244 and the S pole faces the teeth 248 by the formed magnetic flux flow. The relative position between the stator 234 and the rotor 214 shown in FIG. 6B is the rotor position (2).

  When power is supplied to the A-phase coils 250 and 254, as shown in FIG. 6C, the case where the side facing the rotor 214 of the coil 254 wound around the tooth 246 becomes the S pole is assumed. To do. At this time, the side facing the rotor 214 of the coil 250 wound around the teeth 242 becomes the N pole. In this case, the rotor 214 rotates such that the N pole faces the teeth 246 and the S pole faces the teeth 242 by the formed magnetic flux flow. The relative position between the stator 234 and the rotor 214 shown in FIG. 6C is the rotor position (3).

  When power is supplied to the B-phase coils 252 and 256, as shown in FIG. 6D, it is assumed that the side of the coil 256 wound around the teeth 248 facing the rotor 214 becomes the S pole. To do. At this time, the side facing the rotor 214 of the coil 252 wound around the teeth 244 becomes the N pole. In this case, due to the flow of the formed magnetic flux, the rotor 214 rotates so that the N pole faces the teeth 248 and the S pole faces the teeth 244. The relative position between the stator 234 and the rotor 214 shown in FIG. 6D is the rotor position (4).

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

  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 by an operator before the balance is corrected, or may be performed by a cover attaching device (not shown) controlled by the PC 118.

  In step (hereinafter referred to as “S”) S100, PC 118 sets the value of natural number i to initial value “1”. In S102, PC 118 changes the rotational position of rotary shaft 210 to rotor position (i). Specifically, power is supplied to the stator 234 after the nut 236 is loosened while the rotation of the rotary shaft 210 is restricted.

  The PC 118 controls the rotation limiting device 272 so as to limit the rotation of the rotary shaft 210. Furthermore, the fastening of the nut 236 is loosened by rotating the nut 236 in a state where the rotation of the rotary shaft 210 is restricted. The fastening of the nut 236 is loosened by an automatic fastening device (not shown) according to the control signal of the PC 118. Note that the nut 236 may be tightened by an operator.

  At this time, after the rotor 214 is rotated to any one of the rotor positions (1) to (4) shown in FIGS. 6 (A) to (D), the nut 236 is moved by the automatic fastening device. It is concluded again. For example, when the rotor 214 is rotated so as to be at the rotor position (1), the coil 250 wound around the teeth 242 is wound around the teeth 246 so that the side facing the rotor 214 becomes the S pole. In addition, power is supplied to the A-phase coils 250 and 254 so that the side of the coil 254 facing the rotor 214 has N poles.

  In S104, PC 118 controls the electric power supplied to stator 234 so that the rotational speed of rotary 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 S106, PC 118 measures the amount of vibration r (i) on the turbine side. Specifically, the shake amount r (i) is detected by the displacement detection sensor 114 provided to face the cylindrical shape 240 provided at the end of the turbine wheel 208 of the rotating shaft 210. In the present embodiment, PC 118 controls the power supplied to stator 234 so as to stop the rotation of rotor 214 after detecting shake amount r (i) until a predetermined time elapses. The shake amount r (i) is a maximum value or an average value of the shake amounts measured until a predetermined time has elapsed.

  In S108, PC 118 determines whether or not the value of i is “1”. If it is determined that the value of i is “1” (YES in S108), the process proceeds to S112. If not (NO in S108), the process proceeds to S110.

  In S110, the PC 118 determines whether or not the shake amount r (i-1) is larger than the shake amount r (i). If shake amount r (i-1) is larger than shake amount r (i) (YES in S110), the process proceeds to S112. If not (NO in S110), the process proceeds to S114.

  In S112, PC 118 sets Lo = i. In S114, PC 118 adds 1 to the value of i. In S116, PC 118 determines whether the value of i is “4” or more. If the value of i is “4” or more (YES in S116), the process proceeds to S118. If not (NO in S116), the process proceeds to S102.

  In S118, PC 118 changes to the rotor position (Lo). Since the procedure for changing to the rotor position corresponding to the Lo value is as described in S102, the detailed description thereof will not be repeated.

  In S120, PC 118 performs a phase change process of compressor wheel 206. In the phase change processing of the compressor wheel 206, the displacement detection sensor 112 detects the amount of shake on the compressor side. When the detected shake amount is equal to or greater than a predetermined amount, the nut 236 can be loosened while the rotation of the rotary shaft 210 is restricted. In this state, the phase of the rotating shaft 210 and the compressor wheel 206 is changed by rotating the compressor wheel 206 or the like.

  After the phase change process of the compressor wheel 206, the nut 236 is fastened again. Note that after the phase change process, the amount of shake on the compressor side may be measured again. If the measured shake amount is equal to or greater than a predetermined amount, the nut 236 may be loosened again to change the phase between the rotary shaft 210 and the compressor wheel 206, and then the nut 236 may be fastened again.

  An operation of the balance correction device for the electric supercharger according to the present embodiment based on the structure and the 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 202 and the turbine housing 204 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 by a cover attaching device. In such a state, the balance of the rotating shaft 210 is corrected. The value of i is set to the initial value “1” (S100), and the rotor 214 is changed to the rotor position (1) (S102).

  When AC power is supplied from the DC power supply 100 to the stator 234 via the inverter 102, the rotational speed of the rotating shaft 210 increases. When the rotational speed of the rotating shaft 210 detected by the rotational speed sensor 116 rises to a predetermined target rotational speed (S104), the displacement detection sensor 114 starts measuring the amount of vibration r (1) on the turbine side ( S106). After the shake amount r (1) is measured until a predetermined time elapses, the rotation of the rotary shaft 210 is stopped.

  Since the value of i is “1” (YES in S108), the value of Lo is updated to “1” (S112). Thereafter, “1” is added to the value of i and updated to “2” (S114). Since the value of i is not “4” or more (NO in S116), rotor 214 is changed to rotor position (2) (S102).

  When AC power is supplied from the DC power supply 100 to the stator 234 via the inverter 102, the rotational speed of the rotating shaft 210 increases. 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 (S104), the displacement detection sensor 114 starts measuring the amount of vibration r (2) on the turbine side ( S106). After the shake amount r (2) is measured until a predetermined time has elapsed, the rotation of the rotary shaft 210 is stopped.

  Since the value of i is “2” (NO in S108), if the shake amount r (1) is larger than the shake amount r (2) (YES in S110), the value of Lo is updated to “2”. Is done. On the other hand, if shake amount r (1) is equal to or less than shake amount r (2) (NO in S110), “1” is added to the value of i and updated to “3” (S114). Since the value of i is not equal to or greater than “4” (NO in S116), shake amounts r (3) and r (4) corresponding to rotor positions (3) and (4) are similarly measured. Then, the value of i corresponding to the smallest shake amount among the shake amounts r (1) to r (4) is updated as the Lo value (S112).

  When the value of i becomes “4” or more (YES in S116), the rotor position (Lo) is changed (S118). Then, the phase change process of the compressor wheel 206 is executed (S120).

  As described above, according to the balance correction device for the electric supercharger according to the present embodiment, when the rotation of the rotary shaft is restricted and the nut is loosened and then the stator is supplied with electric power, only the rotor is Can be rotated. Therefore, the phase between the rotating shaft and the rotor can be changed. The unbalanced state of the rotating shaft occurs due to the parallelism of components such as a rotor fixed to the rotating shaft. Therefore, by changing the phase between the rotating shaft and the rotor, the aspect of the parallelism stacking can be changed and corrected so as to improve the unbalanced state of the rotating shaft. Furthermore, the balance of the rotating shaft can be corrected by loosening the nuts without disassembling the electric supercharger. Therefore, the unbalanced state of the rotating shaft can be corrected in a shorter time compared with the case where the electric supercharger is disassembled and the balance is corrected and then reassembled. Therefore, it is possible to provide a balance correction device and a balance correction method for correcting an unbalanced state in a short time without disassembling the electric supercharger.

  Further, the rotor in a state in which the rotation of the rotary shaft is limited so as to be the phase angle corresponding to the smallest unbalance amount among the plurality of predetermined phase angles corresponding to the rotor positions (1) to (4). And the phase angle between the stator and the stator are adjusted. Thereby, the phase of a rotating shaft and a rotor can be changed. In particular, by setting the phase angle corresponding to the smallest unbalance amount, it is possible to change the manner of stacking parallelism so that the unbalanced state is improved.

<Modification of the first embodiment>
Hereinafter, the balance correction apparatus for the electric supercharger according to a modification of the first embodiment will be described. Compared with the configuration of the balance correction device for the electric supercharger 216 according to the first embodiment described above, the balance correction device for the electric supercharger according to this modification is provided with displacement detection sensors 112 and 114. The difference is that a rotary shaft 262 is provided instead of the position and 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 the above-mentioned 1st Embodiment. They are given the same reference numerals. Their functions are the same. Therefore, detailed description thereof will not be repeated here.

  The electric supercharger 216 in this modification includes a rotating shaft 262 as shown in FIG. The rotating shaft 262 is formed with processing holes 274 and 276 serving as a reference at the time of processing centering on the rotation axis. In the present modification, the processing holes 274 and 276 have a V-shaped cross section in a cross section passing through the rotation axis of the rotation shaft 262 as shown in FIG. Therefore, a conical space is formed in the processing holes 274 and 276.

  The shape of the rotating shaft 262 is formed by cutting or the like with the processing holes 274 and 276 as reference axes. The present modification is characterized in that the displacement detection sensors 112 and 114 are provided so as to face the machining surfaces 284 and 286 formed in the machining holes 274 and 276, respectively.

  Specifically, the displacement detection sensors 112 and 114 are provided so as to face the V-shaped machining surfaces 284 and 286 in a cross section passing through the rotation axis of the rotation shaft 262 shown in FIG. The displacement detection sensors 112 and 114 detect the amount of displacement during rotation of the rotary shaft 262 in the direction orthogonal to the opposing machining surfaces 284 and 286. A signal corresponding to the detected displacement amount is transmitted to the PC 118.

  The displacement amount of the rotating shaft 262 in the direction orthogonal to the machining surfaces 284 and 286 facing the displacement detection sensors 112 and 114 is determined by the PC 118 when the rotating shaft 262 rotates in the direction orthogonal to the rotating axis. It is converted into the amount of displacement. For example, it is assumed that the machining surface 284 facing the displacement detection sensor 112 has an angle of 30 degrees with respect to the rotation axis in the cross section passing through the rotation axis of the rotation shaft 262 shown in FIG. At this time, the angle formed by the direction of the displacement detection sensor 112 and the direction orthogonal to the rotation axis is also 30 degrees. Therefore, the displacement amount at the time of rotation of the rotating shaft 262 in the direction orthogonal to the processing surface 284 can be converted into the displacement amount at the time of rotation of the rotating shaft 262 in the direction orthogonal to the rotation axis.

  The processing holes 274 and 276 are indispensable configurations as a reference for processing the rotating shaft 262. Therefore, it is possible to measure the shake amount in the direction orthogonal to the rotation axis with high accuracy without newly providing the rotation shaft with a shape capable of being detected in the direction orthogonal to the rotation axis by the displacement detection sensors 112 and 114. it can. Therefore, an increase in cost can be suppressed. In addition, the balance correction apparatus for the electric supercharger according to the present modification differs from the balance correction apparatus for the electric supercharger according to the first embodiment described above only in the shake amount detection method. Other operations and effects are the same as the operations and effects of the balance correction device for the electric supercharger according to the first embodiment described above. Therefore, detailed description thereof will not be repeated.

<Second Embodiment>
Hereinafter, the balance correction apparatus for the electric supercharger according to the second embodiment will be described. Compared to the configuration of the balance correction device for the electric supercharger 216 according to the first embodiment described above, the balance correction device for the electric supercharger according to the present embodiment includes rotation angle detection sensors 258 and 260. Further differences are provided. 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. 10, the balance correction device for electric supercharger 216 according to the present embodiment further includes rotation angle detection sensors 258 and 260. The rotation angle detection sensors 258 and 260 are provided to face the rotor 214. The rotation angle detection sensors 258 and 260 are provided on the same plane orthogonal to the rotation axis. The rotation angle detection sensors 258 and 260 are provided so as to have a phase angle of 90 degrees with the rotation axis as the center. The rotation angle detection sensors 258 and 260 transmit signals indicating the rotation angle to the PC 118, respectively.

  The rotation angle detection sensors 258 and 260 may be newly provided as a configuration of the balance correction device, or may be configured to use a resolver provided in the electric supercharger 216 and are not particularly limited. .

  As shown in FIGS. 11A and 11B, the signal output indicating the magnetic flux density output from the rotation angle detection sensors 258 and 260 shows a change shifted by a phase of 90 degrees.

  For example, in the initial rotor position shown in FIG. 10, it is assumed that the rotation angle detection sensor 258 is in a positional relationship facing the boundary portion between the N pole and the S pole of the rotor 214. When the rotor 214 starts to rotate counterclockwise from this position, as shown in FIG. 11A, the signal output of the rotation angle detection sensor 258 changes as the magnetic flux density changes. That is, the signal output increases as the N pole of the rotor 214 approaches the rotation angle detection sensor 260. The signal output has a maximum value at an angle at which the N pole of the rotor 214 and the rotation angle sensor 258 face each other. Further, the signal output decreases as the south pole of the rotor 214 approaches the rotation angle detection sensor 258.

  It is assumed that the N pole of the rotor 214 is a position facing the rotation angle detection sensor 260 at the initial rotor position shown in FIG. When the rotor 214 starts to rotate counterclockwise from this position, as shown in FIG. 11B, the signal output of the rotation detection sensor 260 changes as the magnetic flux density changes. That is, the signal output decreases as the N pole of the rotor 214 moves away from the rotation angle detection sensor 260. The signal output has a minimum value at an angle at which the S pole of the rotor 214 and the rotation angle sensor 260 face each other. The signal output increases as the south pole of the rotor 214 moves away from the rotation angle detection sensor 260.

  The position of the rotor 214 is changed in a state in which the nut 236 is loosened and the rotation of the rotary shaft 210 is restricted, as shown in FIG. Is generated by causing the rotor 214 to develop a counterclockwise rotational force as indicated by an arrow. In this way, for example, as shown by a one-dot chain line in the vertical direction of the drawing in FIG. 12B, the top of the N pole of the rotor 214 at a position of an angle of 30 degrees with respect to a straight line connecting the teeth 242 and the axis center. Can be moved.

  That is, as shown in FIGS. 13A and 13B, magnetic flux densities Ma and Mb corresponding to a position at an angle of 30 degrees with respect to a straight line connecting the tooth 242 and the axis center are determined in advance. Keep it. After power is supplied to the stator 234, the power supply to the stator 234 is stopped when the magnetic flux density corresponding to the signal output from the rotation angle detection sensors 258 and 260 becomes Ma and Mb. Thereby, the rotor 214 can be rotated to a position at an angle of 30 degrees with respect to a straight line connecting the teeth 242 and the axis center. Note that the position change of the rotor 214 is not limited to 30 degrees. In the following description, the rotation angle of the rotor 214 is a straight line connecting the teeth 242 and the axis center (a one-dot chain line in FIG. 12B) in the vertical direction of the drawing for convenience of description. The straight line connecting the teeth 242 and the axis center is not limited to the reference line.

  The balance correction apparatus according to the present embodiment rotates the position of the rotor 214 to a predetermined rotor position in a state where the fastening of the nut 236 is loosened and the rotation of the rotating shaft 210 is restricted. The balance correction device detects a shake amount corresponding to a predetermined rotor position in a state where the nut 236 is fastened. The balance correction device detects a shake amount corresponding to the position of the plurality of rotors 214. The balance correction device calculates an approximate expression of the phase change of the shake amount based on the detected plurality of shake amounts. The balance correction device calculates a phase angle that is the minimum value of the shake amount of the calculated approximate expression. The balance correction device rotates the nut 236 in a loosened state so that the rotation angle of the rotor 214 becomes a phase angle that is the minimum value of the shake amount and restricts the rotation of the rotary shaft 210. The present embodiment is characterized in that the balance correction apparatus operates as described above.

  In the present embodiment, as shown in FIG. 14A, the position where the N pole of the rotor 214 faces the rotation angle detection sensor 260 is defined as a rotor position A (1). Note that the rotation angle of the rotor 214 at the rotor position A (1) is a (1) with respect to the reference line.

  Further, as shown in FIG. 14B, a position where the N pole of the rotor 214 faces the rotation angle detection sensor 258 is defined as a rotor position A (2). The rotational position of the rotor 214 shown in FIG. 14B is a position rotated 90 degrees counterclockwise from the rotational position of the rotor 214 shown in FIG.

  Furthermore, as shown in FIG. 14C, a position where the south pole of the rotor 214 faces the rotation angle detection sensor 260 is defined as a rotor position A (3). The rotational position of the rotor 214 shown in FIG. 14C is a position further rotated by 90 degrees counterclockwise from the rotational position of the rotor 214 shown in FIG.

  In the present embodiment, the description will be made on the assumption that the shake amount at three points of the rotor positions A (1) to A (3) is detected. However, the present invention is not particularly limited to three points, and is not less than three points. May be. In the present embodiment, the rotor positions A (1) to A (3) are each 90 degrees apart, but are not particularly limited to 90 degrees.

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

  In the flowchart shown in FIG. 15, the same steps as those in the flowchart shown in FIG. 7 are given the same step numbers. The processing is the same for them. Therefore, detailed description thereof will not be repeated here.

  In S202, PC 118 changes the rotational position of rotary shaft 210 to rotor position A (i). Specifically, power is supplied to the stator 234 after the nut 236 is loosened while the rotation of the rotary shaft 210 is restricted. At this time, the PC 118 rotates the rotor 214 to a position where the magnetic flux density based on the signals output from the rotation angle detection sensors 258 and 260 becomes a value corresponding to the rotor position A (i). Thereafter, the nut 236 is fastened again.

  In S204, PC 118 controls the electric power supplied to stator 234 so that the rotational speed of rotary 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 S206, PC 118 measures turbine-side deflection r (i). Specifically, the shake amount r (i) is detected by the displacement detection sensor 114 provided to face the cylindrical shape 240 provided at the end of the turbine wheel 208 of the rotating shaft 210. In the present embodiment, PC 118 controls the power supplied to stator 234 so as to stop the rotation of rotor 214 after detecting shake amount r (i) until a predetermined time elapses. The shake amount r (i) is a maximum value or an average value of the shake amounts measured until a predetermined time has elapsed.

  In S208, PC 118 sets rotation angle a (i + 1) of rotor 214 to rotation angle a (1) + i × 90 degrees. In S210, PC 118 adds “1” to the value of i. In S212, PC 118 determines whether the value of i is “3” or more. If the value of i is “3” or more (YES in S212), the process proceeds to S214. If not (NO in S212), the process proceeds to S202.

  In S214, PC 118 calculates approximate expression f (x) indicating the phase change of the shake amount from the calculated shake amounts r (1) to r (3). The approximate expression is not particularly limited as long as it is a periodic function. For example, it is a trigonometric function. As shown in FIG. 16, the approximate expression f (x) is calculated based on the shake amounts r (1) to r (3) corresponding to the rotation angles a (1) to a (3).

  In S216, the PC 118 calculates the rotation angle Lo corresponding to the minimum shake amount in the calculated approximate expression f (x). For example, as shown in FIG. 16, the angular phase Lo corresponding to the minimum value r (4) of the shake amount is calculated in the calculated approximate expression f (x).

  In S218, PC 118 changes the rotation angle of rotation shaft 210 to angle Lo. Specifically, power is supplied to the stator 234 after the nut 236 is loosened while the rotation of the rotary shaft 210 is restricted. At this time, the relative positional relationship between the rotor 214 and the rotating shaft 210 is the same as the relative positional relationship between the rotor 214 and the rotating shaft 210 at the rotor position A (3). That is, the rotor 214 is at the position of angle a (3). After being rotated from this position to a position corresponding to the angle Lo, the nut 236 is fastened again by the automatic fastening device.

  An operation of the balance correction device for the electric supercharger according to the present embodiment based on the structure and the 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 202 and the turbine housing 204 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 by a cover attaching device. In such a state, the balance of the rotating shaft 210 is corrected. The value of i is set to the initial value “1” (S100), and the rotor 214 is changed to the rotor position A (1) (S202).

  When AC power is supplied from the DC power supply 100 to the stator 234 via the inverter 102, the rotational speed of the rotating shaft 210 increases. When the rotational speed of the rotating shaft 210 detected by the rotational speed sensor 116 increases to a predetermined target rotational speed (S204), the displacement detection sensor 114 starts measuring the amount of vibration r (1) on the turbine side ( S206). After the shake amount r (1) is measured until a predetermined time elapses, the rotation of the rotary shaft 210 is stopped.

  Thereafter, the rotation angle a (2) = a (1) +90 degrees is set (S208). Then, “1” is added to the value of i and updated to “2” (S210). Since the value of i is not “3” or more (NO in S212), rotor 214 is changed to angle a (2) corresponding to rotor position A (2) (S202). Similarly, when r (2) and r (3) are calculated, since the value of i is “3” (YES in S212), the calculated shake amounts r (1) to r (3) Based on this, an approximate expression f (x) is calculated (S214). An angle Lo corresponding to the calculated minimum value of the approximate expression f (x) is calculated (S216).

  After the rotation angle of the rotor 214 is changed to the angle Lo (S218), phase change processing on the compressor wheel 206 side is executed (S220).

  As described above, according to the balance correcting apparatus for the electric supercharger according to the present embodiment, in addition to the effect that is exhibited by the balance correcting apparatus for the electric supercharger according to the first embodiment described above, the rotation Since the rotor can be rotated to a desired position using the angle detection sensor, the relative position of the rotor with respect to the rotation shaft can be changed to a position corresponding to the minimum value of the shake amount. Therefore, the balance correction can be performed with high accuracy.

<Third Embodiment>
Hereinafter, the balance correction apparatus for the electric supercharger according to the third embodiment will be described. The electric turbocharger balance correction device according to the present embodiment is different from the above-described configuration of the electric power supercharger 216 balance correction device according to the second embodiment in that the electric supercharger 216 has a rotating shaft. The difference is that a rotating shaft 410 and a rotor 414 are included instead of 210 and the rotor 214. About another structure, it is the same structure as the structure of the balance correction apparatus of the electric supercharger 216 which concerns on 2nd 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 FIGS. 17A and 17B, in electric supercharger 216 according to the present embodiment, rotation shaft 410 and rotor 414 are separated from each other in a direction perpendicular to the rotation axis (hereinafter referred to as clearance). ) Has a structure that is larger than the rotating shaft 210 and the rotor 214 of the electric supercharger 216 in the second embodiment described above. This makes it possible to omit the inner diameter polishing step of the rotor as compared with the case where the clearance is small like the rotating shaft 210 and the rotor 214 shown in FIG. Therefore, an increase in cost is suppressed.

  The balance correction device for the electric supercharger 216 according to the present embodiment having the above-described configuration is based on the detected unbalance amount, and the nut 236 is loosened, and the rotating shaft 410 and the rotor 414 are loosened. The feature is that the unbalanced state is corrected by changing the clearance.

  Specifically, power is supplied to the stator 234 in a state where the rotation of the rotation shaft 410 is restricted, and the rotor 414 is moved in a direction orthogonal to the rotation axis, whereby the outer diameter of the rotation shaft 410 and the rotor 414 are moved. Change the unbalanced state by changing the clearance with the inner diameter.

  For example, as shown in FIG. 19A, a case is assumed in which the unbalanced position of the rotating shaft 410 is present at the top of the S pole of the rotor 414 by detecting the shake amount. A straight line connecting the unbalanced position and the axis center has an angle of 30 degrees with respect to the center line of the teeth 242 and the teeth 246. It should be noted that the nut 236 is loosened and the position of the rotating shaft 410 is limited.

  At this time, as shown in FIG. 19B, electric power is supplied to the stator 234 so that a magnetic force is generated in a direction along a straight line connecting the aforementioned unbalanced position of the rotor 414 and the shaft center.

  Specifically, the force on the rotor 414 acting on the rotor 414 by the magnetic force generated by the A-phase coils 250 and 254 and the magnetic force expressed by the B-phase coils 252 and 256 on the rotor 414 Magnetic force in a direction along a straight line connecting the unbalanced position of the rotor 414 and the axis center is generated by the resultant force with the acting force in the left direction in FIG. 19B.

  For this reason, as shown in FIG. 19C, the rotor 414 moves along a straight line connecting the unbalanced position and the axis center by the generated magnetic force. Therefore, the rotor 414 moves to the axis center side. As a result, the unbalanced position of the rotating shaft 410 is corrected by moving the unbalanced position toward the axial center to reduce the amount of shake.

  Next, as shown in FIG. 20A, a case is assumed in which the unbalanced position of the rotating shaft 410 is located at the boundary between the north and south poles of the rotor 414 by detecting the shake amount. When this boundary portion is in a positional relationship facing the pole of the stator 234, the magnetic force generated by the B-phase coils 252 and 256 causes the rotor 414 to move along a straight line connecting the unbalanced position and the axis center (specifically May be difficult to move directly (along the left direction in FIG. 20B).

  Therefore, in this case, when the nut 236 is fastened, power is supplied to the stator 234 and the rotor 414 rotates at a predetermined angle so that the boundary between the north and south poles does not face each tooth. Let me. For example, as shown in FIG. 20B, the top of the N pole of the rotor 414 is rotated so as to face a position rotated by 45 degrees with respect to a straight line connecting the tooth 242 and the axis center.

  Then, after loosening the nut 236, electric power is supplied to the stator 234 so that a magnetic force is generated in a direction along a straight line connecting the unbalanced position and the shaft center. The rotor 414 is moved so that the unbalanced position moves toward the axis center side by the generated magnetic force. As a result, the shake amount is reduced and the unbalanced state of the rotating shaft 410 is corrected.

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

  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 by an operator before the balance is corrected, or may be performed by a cover attaching device controlled by the PC 118.

  In S300, PC 118 controls the electric power supplied to stator 234 so that the rotational speed of rotating shaft 410 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 410 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 S <b> 302, PC 118 measures 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 410 rotates. The PC 118 continues to measure vibration until a predetermined time has elapsed since the measurement was started. Note that the shake amount may be measured by the displacement detection sensors 112 and 114 instead of the vibration measurement by the acceleration pickup sensors 104 and 106.

  In S304, PC 118 controls the electric power supplied to stator 234 via inverter 102 so that rotation of rotating shaft 410 stops.

  In S306, 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). When the deflection amount of the rotating shaft 410 is detected by the displacement detection sensors 112 and 114, the PC 118 may determine whether or not the deflection amount is within a predetermined amount. If the vibration is within the allowable range (YES in S306), this process ends. If not (NO in S306), the process proceeds to S308.

In S308, PC 118 calculates an unbalance amount and a phase. The PC 118 analyzes the balance state during rotation of the rotating shaft 410 based on the vibration characteristics measured by the acceleration pickup sensors 104 and 106, and calculates the unbalance amount and phase (unbalance position).
For example, the PC 118 calculates the unbalance amount of the rotating shaft 410 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 414 may be detected using rotation angle detection sensors 258 and 260 such as a resolver, for example. 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 S310, PC 118 detects the relative angle between stator 234 and rotor 414. In S312, based on the detected relative angle between stator 234 and rotor 414, PC 118 determines that N pole or S pole of rotor 414 is the pole of stator 234 (that is, one of the teeth provided on stator 234). Determine whether they match. That is, the PC 118 determines whether or not the boundary portion between the magnetic poles of the rotor 414 and the pole of the stator 234 are in a positional relationship. If the pole of rotor 414 matches the stator pole (YES in S312), the process proceeds to S314. If not (NO in S312), the process proceeds to S316.

  In S314, PC 118 supplies power to stator 234 so as to change the rotation angle of rotor 414. The rotation angle of the rotor 414 may be changed by a predetermined angle. The predetermined angle is not particularly limited, and the rotation angle at which the pole of the rotor 414 and the pole of the stator 234 do not coincide (that is, the rotation at which the boundary portion of the magnetic pole of the rotor 414 and the pole of the stator 234 do not coincide with each other). Angle), there is no particular limitation.

  In S316, the PC 118 limits the rotation of the rotating shaft 410. In S318, PC 118 calculates an energization amount for stator 234. The PC 118 calculates the energization amount based on the detected unbalance amount and phase. For example, the PC 118 calculates the energization amount using a map or the like from the detected unbalance amount and phase.

  In S320, PC 118 brings the nut 236 into a loosened state. In S <b> 322, PC 118 supplies the calculated amount of power to stator 234.

  In S324, PC 118 brings nut 236 into a fastened state. In S326, PC 118 releases the restriction on the rotation of rotating shaft 410.

  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 202 and the turbine housing 204 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 by a cover attaching device. In such a state, the balance of the rotating shaft 410 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 410 increases.

  When the rotational speed of the rotating shaft 410 detected by the rotational speed sensor 116 becomes equal to or higher than a predetermined target rotational speed (S300), vibration measurement is started by the acceleration pickup sensors 104 and 106 (S302). Then, after the vibration measurement is performed until a predetermined time elapses, the rotation of the rotating shaft 410 is stopped (S304).

  If the measured vibration is within the allowable range (YES in S306), 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 S306), an unbalance amount and a phase are calculated based on the measured vibration characteristics (S308). Then, the relative angle between the stator 234 and the rotor 414 is detected (S310).

  If the detected relative angle between stator 234 and rotor 414 is not an angle at which the rotor pole and the stator pole coincide with each other (NO in S312), rotation of rotating shaft 410 is restricted (S316). On the other hand, if the detected relative angle between stator 234 and rotor 414 is an angle at which the rotor pole matches the stator pole (YES in S312), power is supplied to stator 234 and the rotation angle of rotor 414 changes. After the rotation (S314), the rotation of the rotating shaft 410 is restricted (S316).

The energization amount supplied to the stator 234 is calculated (S318), and the fastening of the nut 236 is loosened while the rotation of the rotating shaft 410 is restricted (S320). When the calculated amount of power is supplied to the stator 234 (S322), the clearance in the direction perpendicular to the rotation axis changes between the rotation shaft 410 and the rotor 414. That is, the unbalanced position is corrected because the rotor 414 moves toward the shaft center side (that is, the side where the shake amount decreases). Thereafter, the nut 236 is fastened (S324), and the restriction on the rotation of the rotary shaft 410 is released (S326).
As described above, according to the balance correction device for the electric supercharger according to the present embodiment, when electric power is supplied to the stator in a state where the rotation of the rotating shaft is limited, only the rotor remains with the position of the rotating shaft limited. Can be moved in a direction perpendicular to the rotation axis. Therefore, the clearance between the rotating shaft and the rotor can be changed. The unbalanced state of the rotating shaft occurs due to the parallelism of components such as a rotor fixed to the rotating shaft. Therefore, by changing the clearance between the rotating shaft and the rotor, the manner of parallelism stacking can be changed, and correction can be made to improve the unbalanced state of the rotating shaft. Furthermore, the balance of the rotating shaft can be corrected by loosening the nuts without disassembling the electric supercharger. Therefore, the unbalanced state of the rotating shaft can be corrected in a shorter time compared with the case where the electric supercharger is disassembled and the balance is corrected and then reassembled. Therefore, it is possible to provide a balance correcting device that corrects the unbalanced state in a short time without disassembling the electric supercharger.

  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 structure of the electric supercharger mounted in the engine. It is a figure which shows the structure of the supercharger which does not have a rotary electric machine. It is a figure which shows the aspect of accumulation of the parallelism of a compressor wheel, a collar, and a thrust bearing. It is a figure which shows the rotor and stator of the electric supercharger in 1st Embodiment. It is a figure which shows the positional relationship of the rotor and stator in each rotor position in 1st Embodiment. It is a flowchart which shows the procedure of the balance correction of the balance correction apparatus of the electric supercharger which concerns on 1st Embodiment. It is a figure which shows the structure of the balance correction apparatus of the electric supercharger which concerns on the modification of 1st Embodiment. It is a figure which shows the structure of the detection target object by a displacement detection sensor. It is a figure which shows the rotor and stator of the electric supercharger in 2nd Embodiment. It is a figure (the 1) which shows the change of the magnetic flux density detected by a rotation angle detection sensor. It is a figure which shows the aspect of the balance correction in 2nd Embodiment. It is a figure (the 2) which shows the change of the magnetic flux density detected by a rotation angle detection sensor. It is a figure which shows the positional relationship of the rotor and stator in each rotor position in 2nd Embodiment. It is a flowchart which shows the procedure of balance correction of the balance correction apparatus of the electric supercharger which concerns on 2nd Embodiment. It is a figure which shows the detected shake amount and approximate expression. It is a figure which shows the structure of the rotating shaft and rotor in 3rd Embodiment. It is a figure which shows the structure of a rotating shaft and a rotor in case a clearance is small. It is FIG. (1) which shows the aspect of balance correction in 3rd Embodiment. It is FIG. (2) which shows the aspect of balance correction in 3rd Embodiment. It is a flowchart which shows the procedure of the balance correction of the balance correction apparatus of the electric supercharger which concerns on 3rd Embodiment.

Explanation of symbols

  100 DC power source, 102 inverter, 104, 106 acceleration pickup sensor, 108, 110 cover, 112, 114 displacement detection sensor, 116 rotation speed sensor, 118 PC, 202, 302 compressor housing, 204, 304 turbine housing, 206, 306 compressor Wheel, 208, 308 turbine wheel, 210, 262, 310, 410 rotating shaft, 214, 414 rotor, 216 electric supercharger, 222, 224, 322, 324 radial bearing, 228, 328 thrust bearing, 230, 330 housing, 232, 332 Collar, 234 Stator, 236, 336 Nut, 238 Spacer, 240 Protrusion, 242, 244, 246, 248 Teeth, 250, 252 , 254, 256 coil, 258, 260 rotation angle detection sensor, 268, 270 opening, 272 rotation limiting device, 274, 276 machining hole, 280, 350 stepped portion, 284, 286 machining surface, 300 supercharger, 302.

Claims (16)

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. Including a rotating electric machine composed of a rotor whose position around the rotation axis is fixed by a fastening force of a fastening member and a stator fixed to the casing of the electric supercharger,
Supply means for supplying electric power to the stator and rotating the rotor;
Detecting means for detecting an unbalance amount of the rotating shaft when the rotating speed of the rotating shaft is a predetermined rotating speed;
Correction means for correcting the unbalanced state by changing the phase of the rotating shaft and the rotor in a state where the fastening member is loosened based on the detected unbalance amount. Including an electric supercharger balance correction device.   The correcting means changes the phase of the rotating shaft and the rotor by supplying power to the stator and rotating the rotor in a state in which the rotation of the rotating shaft is limited, The balance correcting device for an electric supercharger according to claim 1, comprising means for correcting an unbalanced state. The supply means is in a state in which rotation of the rotary shaft is restricted so that a phase angle between the rotor and the stator becomes a plurality of predetermined phase angles, and the fastening member is fastened. Means for supplying power to the stator in a loosened state,
The detection means is for detecting unbalance amounts corresponding to the plurality of phase angles when the number of rotations of the rotating shaft is a predetermined number of rotations in a state where the fastening member is fastened. Including means,
The correcting means rotates the rotating shaft so that a phase angle between the rotor and the stator becomes a phase angle corresponding to the smallest unbalance amount among the plurality of predetermined phase angles. The electric motor according to claim 2, further comprising means for correcting the unbalanced state by supplying electric power to the stator in a state in which the fastening member is loosened and the fastening member is loosened. Supercharger balance correction device. 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 electrical machine composed of a rotor fixed in a direction orthogonal to the rotation axis by a fastening force of a fastening member and a stator fixed to the casing of the electric supercharger,
Supply means for supplying electric power to the stator and rotating the rotor;
Detecting means for detecting an unbalance amount of the rotating shaft when the rotating speed of the rotating shaft is a predetermined rotating speed;
Correction means for correcting the unbalanced state by changing a clearance between the rotary shaft and the rotor in a state where the fastening member is loosened based on the detected unbalance amount. , Electric supercharger balance correction device. The rotating shaft is provided through the rotor,
The correction means supplies power to the stator in a state in which the rotation of the rotating shaft is limited, and moves the rotor in a direction perpendicular to the rotation axis, thereby reducing the outer diameter of the rotating shaft and the The balance correction apparatus for an electric supercharger according to claim 4, further comprising means for changing the clearance with the inner diameter of the rotor to correct the unbalanced state. The rotor has two magnetic poles;
The balance correction device further includes an angle detection means for detecting a rotation angle of the rotor,
In the supplying means, the fastening member is fastened when the detected rotation angle of the rotor is an angle in which the boundary portion of the magnetic pole of the rotor and the magnetic pole of the stator face each other. 6. The electric supercharger balance correcting device according to claim 5, further comprising means for supplying electric power to the stator such that the boundary portion rotates at an angle not facing the magnetic pole of the stator in a state. .   The said detection means is provided facing the both ends of the said rotation shaft, The displacement detection means for detecting the displacement amount of the direction orthogonal to the rotating shaft of the said rotation shaft is included in any one of Claims 1-6. The balance correction apparatus of the electric supercharger as described in 2.   7. The electric overload according to claim 1, wherein the detection unit includes a vibration detection unit that is provided in a casing of the electric supercharger and detects vibration generated in the electric supercharger. Feeder balance correction device. 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. Including a rotating electric machine composed of a rotor whose position around the rotation axis is fixed by a fastening force of a fastening member and a stator fixed to the casing of the electric supercharger,
A supply step of supplying electric power to the stator and rotating the rotor;
A detection step of detecting an unbalance amount of the rotary shaft when the rotational speed of the rotary shaft is a predetermined rotational speed;
A correction step of correcting the unbalanced state by changing the phase between the rotating shaft and the rotor in a state where the fastening member is loosened based on the detected unbalanced amount. Electric turbocharger balance correction method.   In the state of limiting the rotation of the rotating shaft, the correcting step changes the phase between the rotating shaft and the rotor by supplying electric power to the stator and rotating the rotor. The balance correction method of the electric supercharger according to claim 9, comprising a step of correcting the unbalance state. The supplying step is a state in which the rotation of the rotary shaft is limited so that the phase angle between the rotor and the stator becomes a plurality of predetermined phase angles, and the fastening member is fastened. Supplying power to the stator in a loosened state;
The detecting step includes a step of detecting unbalance amounts corresponding to the plurality of phase angles, respectively, in a state where the fastening member is fastened and a rotational speed of the rotary shaft is a predetermined rotational speed. Including
In the correcting step, the rotation shaft is rotated so that a phase angle between the rotor and the stator is a phase angle corresponding to a smallest unbalance amount among the plurality of predetermined phase angles. 11. The electric supercharging according to claim 10, further comprising: supplying electric power to the stator to correct the unbalanced state in a state in which the fastening member is loosened and the fastening member is loosened. Machine balance correction method. 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 electrical machine composed of a rotor fixed in a direction orthogonal to the rotation axis by a fastening force of a fastening member and a stator fixed to the casing of the electric supercharger,
A supply step of supplying electric power to the stator and rotating the rotor;
A detection step of detecting an unbalance amount of the rotary shaft when the rotational speed of the rotary shaft is a predetermined rotational speed;
A correction step of correcting the unbalanced state by changing a clearance between the rotating shaft and the rotor in a state where the fastening member is loosened based on the detected unbalanced amount. How to correct the balance of the turbocharger. The rotating shaft is provided through the rotor,
The correction step supplies power to the stator in a state in which the rotation of the rotating shaft is limited, and moves the rotor in a direction perpendicular to the rotation axis, thereby reducing the outer diameter of the rotating shaft and the The balance correction method for the electric supercharger according to claim 12, comprising a step of correcting the unbalanced state by changing a clearance between the rotor and an inner diameter of the rotor. The rotor has two magnetic poles;
The balance correction method further includes an angle detection step of detecting a rotation angle of the rotor,
In the supplying step, the fastening member is fastened when the detected rotation angle of the rotor is an angle where a boundary portion between the magnetic poles of the rotor and a magnetic pole of the stator are opposed to each other. The balance correction method of the electric supercharger according to claim 13, further comprising: supplying electric power to the stator so that the boundary portion rotates at an angle that does not face the magnetic poles of the stator.   The detection step includes a step of detecting a displacement amount in a direction perpendicular to a rotation axis of the rotation shaft by a displacement detection sensor provided opposite to both ends of the rotation shaft. A method for correcting the balance of the electric supercharger according to claim 1.   The electric detection according to any one of claims 9 to 14, wherein the detecting step includes a step of detecting vibration generated in the electric supercharger by an acceleration pickup sensor provided in a casing of the electric supercharger. How to correct the balance of the turbocharger.

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