Motor-driven compressor

Abstract

A motor-driven compressor includes a compression mechanism, an electric motor, a housing, a drive circuit unit, a cover body, and a shield. The compression mechanism has a compression chamber and compresses refrigerant. The electric motor drives the compression mechanism. The housing accommodates the compression mechanism and the electric motor. The drive circuit unit drives the electric motor. The drive circuit unit includes a multi-layer board and electronic components mounted on the multi-layer board. The multi-layer board includes a ground layer. The cover body covers the drive circuit unit. The cover body is arranged at an outer side of the housing. The shield encompasses at least some of the electronic components. The shield is electrically connected to the ground layer of the multi-layer board.

1 . A motor-driven compressor comprising:
 a compression mechanism that has a compression chamber and compresses refrigerant;   an electric motor that drives the compression mechanism;   a housing that accommodates the compression mechanism and the electric motor;   a drive circuit unit that drives the electric motor, wherein the drive circuit unit includes a multi-layer board and electronic components mounted on the multi-layer board, and the multi-layer board includes a ground layer;   a cover body that covers the drive circuit unit, wherein the cover body is arranged at an outer side of the housing; and   a shield that encompasses at least some of the electronic components, wherein the shield is electrically connected to the ground layer of the multi-layer board.   
     
     
         2 . The motor-driven compressor according to  claim 1 , further comprising a heat-releasing member that contacts at least some of the electronic components, wherein the shield is located on the heat-releasing member. 
     
     
         3 . The motor-driven compressor according to  claim 1 , wherein the shield is located on the housing or the cover body. 
     
     
         4 . The motor-driven compressor according to  claim 1 , wherein the shield is separated from the multi-layer board. 
     
     
         5 . The motor-driven compressor according to  claim 4 , wherein the shield includes an end opposed to the multi-layer board, and a gap extends between the end and the multi-layer board. 
     
     
         6 . The motor-driven compressor according to  claim 1 , wherein
 the shield includes an end opposed to the multi-layer board,   the end includes a flange that extends along a surface of the multi-layer board, and   the flange is joined with the multi-layer board.   
     
     
         7 . The motor-driven compressor according to  claim 1 , further comprising a base that abuts against the housing or the cover body, wherein the base includes a leg to which the multi-layer board is fixed, and the base electrically connects the shield to the ground layer.