Electric compressor with integral inverter
View Patent ↗An electric compressor provided with an integral inverter, incorporated with a motor and provided in a receiving space surrounded by a compressor housing with a motor drive circuit that includes the inverter. At least some of electric parts including the motor drive circuit are covered by a resin charged into the receiving space, and a part of a region which is in the receiving space and into which the resin can be charged is filled with a light-weight material different from the charged resin. In the structure of the resin covering section for such a motor drive circuit, the amount of resin charged is significantly reduced, and the entire compressor is reduced in weight and cost.
1. An electric compressor comprising:
a compressor housing comprising a receiving space;
a motor;
an integral inverter, incorporated with the motor and provided in said receiving space surrounded by the compressor housing with a motor drive circuit that comprises said integral inverter;
at least some electric parts comprising said motor drive circuit, a capacitor, and said integral inverter are covered by a resin charged into said receiving space, and
a plurality of preformed resin parts occupy a part of a region, which is in said receiving space and into which said resin is charged; and
said plurality of preformed resin parts are formed of a material different from said charged resin and said at least some electric parts;
wherein each preformed resin part of said plurality of preformed resin parts has a shape complementary to at least one electric part in order to be mounted at a predetermined site in said receiving space, and
wherein each of said plurality of preformed resin parts is located between said at least one electric part and said charged resin to hold said at least some electric parts, and
wherein said material different from said charged resin is a material the density or bulk density of which is less than that of said charged resin.
2. The electric compressor with said integral inverter according to claim 1 , wherein each preformed resin part is made of a foamed body.
3. The electric compressor with said integral inverter according to claim 1 , wherein said material different from said charged resin is an assembly of synthetic fibers.
4. The electric compressor with said integral inverter according to claim 1 , wherein said at least some electric parts comprising said motor drive are provided in said receiving space and proximate to a refrigerant suction path, so as to enable heat exchange with refrigerant sucked as fluid to be compressed.
5. The electric compressor with said integral inverter according to claim 1 , wherein said resin charging is performed after said material different from said charged resin has been incorporated in said receiving space with said at least some electric parts.
6. The electric compressor with said integral inverter according to claim 1 , wherein said charged resin is a thermosetting resin.
7. An air conditioning system for vehicles comprising the electric compressor with the integral inverter according to claim 1 .
8. A method for manufacturing an electric compressor installing a motor, an integral inverter, and a motor drive circuit in a receiving space provided in a compressor housing adjacent to a motor housing portion;
forming a charging space between at least some electric parts of said motor drive circuit and a material structure having a shape complementary to said at least some electric parts;
charging a liquid resin material into at least said charging space of said receiving space, wherein said material structure is formed from a material different from said charged liquid resin and said different material is a material the density or bulk density of which is less than that of said charged liquid resin; and
coating said at least some electric parts comprising said motor drive circuit are coated with said liquid resin charged into at least said charging space of said receiving space,
wherein said material structure is formed in a shape to hold said at least some electric parts prior to said resin charging.
9. The method for manufacturing the electric compressor with said integral inverter according to claim 8 ,
heating said at least some electric parts including said motor drive circuit; and
performing the resin charging under a residual heat condition after heating of said at least some of electric parts including said motor drive circuit.