Inverter-integrated motor for an automotive vehicle

Abstract

A bus-bar integrated plate and outer frame section, arranged into a double-deck structure and having numerous bus bars molded with a resin molding plate portion, is provided as a wiring for connecting power switching elements and a smoothing capacitor, fixed on an outer surface of a cylindrical wall of a motor housing, to a printed circuit board serving as a control circuit.

1 . An inverter-integrated motor for an automotive vehicle, comprising: 
 a housing;    a cylindrical motor section accommodated in said housing; and    an inverter circuit section fixed to said housing for converting direct-current power into three-phase alternating-current power and supplying the converted alternating-current power to said motor section;    wherein said inverter circuit section comprises:    power switching elements constituting respective arms of a three-phase inverter circuit;    a smoothing capacitor connected between a pair of direct-current input terminals of said three-phase inverter circuit;    a control circuit for controlling said power switching elements; and    a wiring section for connecting said power switching elements, said smoothing capacitor, and said control circuit,    wherein said wiring section comprises a bus-bar integrated plate including numerous bus bars integrally molded into a resin molding plate portion so as to assure mutual electrical insulation, and said bus-bar integrated plate being fixed to an outer surface of a cylindrical wall of said housing via said resin molding plate portion, and    distal ends of said bus bars protruding from said resin molding plate portion are connected to respective electrode terminals of said power switching elements, terminals of said smoothing capacitor, and predetermined joint portions of said control circuit,    wherein said bus-bar integrated plate is positioned at a radial outer side of said power switching elements fixed directly or via a radiator plate on the outer surface of said cylindrical wall of said housing, said bus-bar integrated plate extending in a tangential direction of said motor section with a predetermined radial gap kept therebetween.    
   
   
       2 . The inverter-integrated motor for an automotive vehicle in accordance with  claim 1 , wherein 
 said bus-bar integrated plate is positioned between said power switching elements fixed directly or via the radiator plate on the outer surface of said cylindrical wall of said housing and a printed circuit board positioned at the radial outer side of said power switching elements and extending in a tangential direction of said motor section for mounting said control circuit, and    said bus-bar integrated plate is substantially parallel to said printed circuit board, and overlaps with said power switching elements and said printed circuit board with predetermined radial gaps kept therebetween.    
   
   
       3 . The inverter-integrated motor for an automotive vehicle in accordance with  claim 1 , wherein 
 said resin molding plate portion of said bus-bar integrated plate is integrally resin molded with an outer frame portion, said outer frame portion is fixed to the outer surface of said cylindrical wall of said housing so as to surround said power switching elements and said printed circuit board, and    said resin molding plate portion extends in the tangential direction of said motor section from an inner surface of said outer frame portion.    
   
   
       4 . The inverter-integrated motor for an automotive vehicle in accordance with  claim 3 , wherein 
 an outer peripheral portion of said printed circuit board is connected to a stepped surface of said outer frame portion which is positioned lower than a top surface of said outer frame portion, and    an inside space of said outer frame portion is closed by a cover plate which is fixed to said top surface of said outer frame portion.    
   
   
       5 . The inverter-integrated motor for an automotive vehicle in accordance with  claim 4 , wherein a central support shaft, integrally formed with said resin molding plate portion or with said outer frame portion, is brought into contact with a central portion of said printed circuit board.  
   
   
       6 . The inverter-integrated motor for an automotive vehicle in accordance with  claim 4 , wherein a grounding bus bar, serving as a low direct-current line of said inverter circuit section, protrudes from said resin molding plate portion or from said outer frame portion and is fixed on the outer surface of said cylindrical wall of said housing.  
   
   
       7 . The inverter-integrated motor for an automotive vehicle in accordance with  claim 3 , wherein a grounding bus bar, connected to a grounding conductor of said printed circuit board constituting part of said inverter circuit section, protrudes from said resin molding plate portion or from said outer frame portion and is fixed on the outer surface of said cylindrical wall of said housing.  
   
   
       8 . The inverter-integrated motor for an automotive vehicle in accordance with  claim 1 , wherein 
 external power source terminals, integrally formed with or connected to a power source bus bar serving as a high direct-current line of said inverter circuit section, are connected to external power source cables, and    a power connector section is integrally formed with said outer frame portion so as to surround said external power source terminals.    
   
   
       9 . The inverter-integrated motor for an automotive vehicle in accordance with  claim 1 , wherein 
 external communication terminals, serving as communication transmission lines intervening between said control circuit and an external device, are connected to external communication cables, and    a communication connector section is integrally formed with said outer frame portion so as to surround said external communication terminals.    
   
   
       10 . An inverter-integrated motor for an automotive vehicle, comprising: 
 a housing;    a cylindrical motor section accommodated in said housing; and    an inverter circuit section fixed to said housing for converting direct-current power into three-phase alternating-current power and supplying the converted alternating-current power to said motor section;    wherein said inverter circuit section comprises:    power switching elements constituting respective arms of a three-phase inverter circuit;    a smoothing capacitor connected between a pair of direct-current input terminals of said three-phase inverter circuit;    a control circuit for controlling said power switching elements; and    a plurality of bus bars constituting a wiring for connecting said power switching elements, said smoothing capacitor, and said control circuit,    wherein said power switching elements and said smoothing capacitor are fixed directly or via a radiator plate on an outer surface of a cylindrical wall of said housing,    circuit components constituting said control circuit are mounted on a printed circuit board disposed at a radial outer side of said power switching elements, with said bus bars intervening between said printed circuit board and said power switching elements, and    said power switching elements are connected to said printed circuit board via said bus bars.    
   
   
       11 . An inverter-integrated motor for an automotive vehicle, comprising: 
 a housing;    a cylindrical motor section accommodated in said housing; and    an inverter circuit section fixed to said housing for converting direct-current power into three-phase alternating-current power and supplying the converted alternating-current power to said motor section;    wherein said inverter circuit section comprises:    power switching elements constituting respective arms of a three-phase inverter circuit;    a smoothing capacitor connected between a pair of direct-current input terminals of said three-phase inverter circuit;    a control circuit for controlling said power switching elements; and    a plurality of bus bars constituting a wiring for connecting said power switching elements, said smoothing capacitor, and said control circuit,    wherein said inverter circuit section is accommodated in a closed space defined by an outer frame portion fixed on an outer surface of a cylindrical wall of said housing, a cover plate fixed on a top surface of said outer frame portion, and said outer surface of said cylindrical wall of said housing, and    said outer frame portion surrounds terminals of said motor section extending out of said cylindrical wall of said housing.    
   
   
       12 . An inverter-integrated motor for an automotive vehicle, comprising: 
 a housing;    a cylindrical motor section accommodated in said housing; and    an inverter circuit section fixed to said housing for converting direct-current power into three-phase alternating-current power and supplying the converted alternating-current power to said motor section;    wherein said inverter circuit section comprises:    power switching elements constituting respective arms of a three-phase inverter circuit;    a smoothing capacitor connected between a pair of direct-current input terminals of said three-phase inverter circuit;    a control circuit for controlling said power switching elements; and    a plurality of bus bars constituting a wiring for connecting said power switching elements, said smoothing capacitor, and said control circuit,    wherein said inverter circuit section is accommodated in a closed space defined by an outer frame portion fixed on an outer surface of a cylindrical wall of said housing, a cover plate fixed on a top surface of said outer frame portion, and said outer surface of said cylindrical wall of said housing, and    said closed space for accommodating said inverter circuit section is filled with a resin.