Motor-driven compressor

Abstract

A motor-driven compressor includes a motor driving circuit, which includes a capacitor electrically connected to a circuit board, and a capacitor holder, which holds the capacitor. The capacitor holder includes a side wall body, which covers a side surface of the capacitor, a first retainer, which extends from the side wall body to the circuit board and engages with a first end surface of the capacitor, and a second retainer, which extends from the side wall body in a direction away from the circuit board and holds the second end surface of the capacitor. The length of the second retainer in the extending direction of the second retainer is greater than the length of the first retainer in the extending direction of the first retainer.

1 . A motor-driven compressor, comprising:
 a compression unit adapted to compress refrigerant;   an electric motor adapted to drive the compression unit;   a housing that accommodates the compression unit and the electric motor;   a motor driving circuit that is adapted to drive the electric motor and includes a circuit board and a capacitor that is electrically connected to the circuit board; and   a capacitor holder that is made of a plastic and holds the capacitor, wherein   the capacitor holder includes
 a side wall body, which covers a side surface of the capacitor, 
 a first retainer, which extends from the side wall body toward the circuit board and engages with a first end surface of the capacitor to hold the capacitor, and 
 a second retainer, which extends from the side wall body in a direction away from the circuit board and engages with a second end surface of the capacitor to hold the capacitor, wherein 
   a length of the second retainer in an extending direction of the second retainer is greater than a length of the first retainer in an extending direction of the first retainer, and   the second retainer is elastically deformed so that the capacitor holder accommodates the capacitor.   
     
     
         2 . The motor-driven compressor according to  claim 1 , wherein
 the second retainer is one of a plurality of second retainer provided for the capacitor,   the first retainer is provided such that the first retainer is located between an adjacent pair of the second retainers, and   a width of the first retainer is greater than a width of each of the second retainer.   
     
     
         3 . The motor-driven compressor according to  claim 1 , wherein
 the capacitor includes a lead, which protrudes from the capacitor, wherein the capacitor is electrically connected through the lead to the circuit board, and   the side wall body includes a through-hole, which guides the lead to a portion of the circuit board to which the lead is to be connected.   
     
     
         4 . The motor-driven compressor according to  claim 3 , wherein
 the capacitor has a substantially cuboid shape,   the side wall body has a hollowed polygonal shape configured by a plurality of side walls, which surround four sides of the capacitor,   the through-hole is formed in one of the side walls that is positioned to face one of the four sides of the capacitor, and   the first retainer and the second retainer are provided in each of two of the side walls that face each other, wherein the two side walls that face each other are formed to be continuous with the side wall in which the through-hole is formed.   
     
     
         5 . The motor-driven compressor according to  claim 1 , further comprising a coupling member, which configures a part of the housing, wherein
 the capacitor holder is coupled to the coupling member, and   the coupling member includes an engaging portion, which engages with the second retainer to limit an amount of elastic deformation of the second retainer.   
     
     
         6 . The motor-driven compressor according to  claim 5 , wherein the engaging portion includes a recess. 
     
     
         7 . The motor-driven compressor according to  claim 1 , wherein the capacitor is a film capacitor. 
     
     
         8 . The motor-driven compressor according to  claim 1 , further comprising a rotation shaft that is accommodated in the housing and rotated integrally with a rotor of the electric motor, wherein
 the compression unit, the electric motor, and the motor driving circuit are arranged in this order along an axis of the rotation shaft.   
     
     
         9 . The motor-driven compressor according to  claim 1 , wherein the motor-driven compressor is mounted on a vehicle.