US 12,293,862 B2
Motor-driven compressor
Shun Ito, Kariya (JP); Kazuhiro Shiraishi, Kariya (JP); Yoshiki Nagata, Kariya (JP); Takashi Kawashima, Kariya (JP); Hiroshi Fukasaku, Kariya (JP); and Shunsuke Ambo, Kariya (JP)
Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Aichi-Ken (JP)
Filed by KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Aichi-ken (JP)
Filed on Oct. 24, 2023, as Appl. No. 18/383,139.
Claims priority of application No. 2022-174125 (JP), filed on Oct. 31, 2022.
Prior Publication US 2024/0145152 A1, May 2, 2024
Int. Cl. H01F 17/06 (2006.01); H01F 27/29 (2006.01); H02M 1/12 (2006.01)
CPC H01F 17/062 (2013.01) [H01F 27/292 (2013.01); H02M 1/123 (2021.05)] 4 Claims
OG exemplary drawing
 
1. A motor-driven compressor, comprising:
a compression unit configured to compress a fluid;
a motor configured to drive the compression unit; and
an inverter device accommodated in a metal housing, the inverter device being configured to drive the motor, wherein
the inverter device includes:
an inverter circuit configured to convert DC power to AC power;
a noise reducing unit that is provided on an input side of the inverter circuit and is configured to reduce common-mode noise and normal-mode noise included in the DC power before the DC power is supplied to the inverter circuit; and
a circuit board on which the inverter circuit and the noise reducing unit are mounted,
the noise reducing unit includes:
a common mode choke coil; and
a smoothing capacitor that forms a low-pass filter together with the common mode choke coil,
the common mode choke coil includes:
an annular core;
two windings wound around the core; and
an annular conductor that covers both of the two windings,
the conductor is divided into a first metal plate and a second metal plate,
the first metal plate and the second metal plate are combined to form an annular shape such that induced current flows in a circumferential direction of the conductor so as to hinder changes in leakage magnetic flux from the core,
the circuit board is disposed on an opposite side of the common mode choke coil from the housing,
the second metal plate includes:
a main body disposed on an opposite side of the two windings from the first metal plate; and
two extending portions that extend from the main body toward the housing,
the second metal plate is thermally connected to the housing,
the first metal plate is thermally connected to the second metal plate, and
at least one of an electrical resistance value or a thermal resistance value in a current path of the induced current is lower in the second metal plate than in the first metal plate.