Structure and method for adjusting balance of turbocharging device incorporating electric motor

Abstract

An object is to increase portions (increase the amount of correction), where the rotational balance of a rotary shaft of a turbocharging device incorporating an electric motor is adjusted, and to maintain sufficient motor driving force even under a high temperature condition. In a balance adjusting structure for the turbocharging device incorporating an electric motor, a rotor core 5 formed by laminating electromagnetic steel plates 51 is interposed between rotor blades provided on one end or both ends, a rotational balance adjusting member made of iron (magnetic induction member) having a thickens larger than the thickness of each electromagnetic steel plate 51 is disposed on an end of the laminated electromagnetic steel plates 51 , or between the laminated layers.

1 . A balance adjusting structure for turbocharging device incorporating an electric motor, comprising:
 at least one rotor blade disposed in a housing;   a shaft connected to the rotor blade;   a bearing formed in the housing, and configured to rotatably axially support the shaft;   a rotor core penetrated by the shaft; and   a stator disposed at a position facing the rotor core in the housing, and configured to rotate and drive the rotor core together with the shaft by a magnetic field, wherein   the rotor core includes:   a sleeve fitted onto the shaft;   a plurality of electromagnetic steel plates laminated in an axial direction of the sleeve and fitted onto the sleeve; and   a rotational balance adjusting member disposed on a part of the electromagnetic steel plates in a laminating direction, and having a thickness larger than a thickness of each electromagnetic steel plate, and   the rotational balance adjusting member is processed to adjust rotational balance.   
     
     
         2 . The balance adjusting structure for a turbocharging device incorporating an electric motor according to  claim 1 , wherein
 the rotor core is configured such that the rotational balance adjusting member is disposed on an intermediate part of the laminated electromagnetic steel plates.   
     
     
         3 . The balance adjusting structure for a turbocharging device incorporating an electric motor according to  claim 1 , wherein
 the rotor core includes:   the sleeve fitted onto the shaft;   the plurality of electromagnetic steel plates fitted onto the sleeve, and arranged as a lamination; and   a rotational balance adjusting member fixed to both ends of the sleeve, and configured to fix and sandwich the plurality of electromagnetic steel plates.   
     
     
         4 . The balance adjusting structure for a turbocharging device incorporating an electric motor according to  claim 1 , wherein
 the rotor core has:   a rotational balance adjusting member fitted onto the sleeve, and interposed on an intermediate part of the plurality of electromagnetic steel plates that are arranged as a lamination; and   a rotational balance adjusting member configured to fix and sandwich both ends of the laminated electromagnetic steel plates, and fixed to both ends of the sleeve.   
     
     
         5 . The balance adjusting structure for a turbocharging device incorporating an electric motor according to  claim 1 , wherein
 at least one rotational balance adjusting member of the rotational balance adjusting members is configured by assembling laminated layers of the same magnetic material as the electromagnetic steel plates of the rotor core.   
     
     
         6 . The balance adjusting structure for a turbocharging device incorporating an electric motor according to  claim 1 , wherein
 the turbocharging device incorporating an electric motor is either a turbo charger incorporating a motor generator that is mounted with a turbine wheel, which is a rotor blade for utilizing exhaust gas energy on an end of the shaft penetrating the rotor core and the bearing, and that is also mounted with a compressor impeller, which is a rotor blade for compressing inlet air on other end thereof, or an electric supercharger that does not have the turbine wheel and that is mounted with a compressor impeller for compressing inlet air only on one end of the shaft.   
     
     
         7 . A rotational balance adjusting method for a rotor of the turbocharging device incorporating an electric motor,
 the method comprising the steps of:   performing rotational balance adjustment by singly using a rotor blade;   assembling a rotor including the rotor blade, and a rotor core having a rotational balance adjusting member made of a magnetic material;   measuring a balance amount by rotating the rotor; and   adjusting and processing rotational balance by using a rotor blade fastening nut, the rotational balance adjusting member of the rotor core, or both of the rotor blade fastening nut and the rotational balance adjusting member, on the basis of a result of measurement.   
     
     
         8 . The balance adjusting method for a turbocharging device incorporating an electric motor according to  claim 7 , further comprising
 a step of adjusting rotational balance by singly using the rotor core before the step of assembling the rotor.