Electrically powered pump

An electrically powered pump, comprising:

• a housing comprising:
• a suction port,
• a discharge port, and
• a plurality of coils disposed in a circumferential direction of the housing, the housing having a cylindrical inner circumferential surface having a circular shape in section,
• a cylindrical outer rotor rotatably disposed on an inner circumferential side of the housing, the outer rotor having a plurality of permanent magnets on an outer circumferential surface thereof which comprise a motor section in cooperation with the plurality of coils of the housing,
• an inner rotor disposed on an inner circumferential side of the outer rotor so as to be rotatable about a rotation axis eccentric relative to a central axis of the outer rotor, the inner rotor cooperating with the outer rotor to form a space therebetween which is communicated with the suction port and the discharge port, the inner rotor having a plurality of slots on an outer circumferential surface thereof which extend in a radial direction of the inner rotor, and
• a plurality of connection plates which transmit a rotational force from the outer rotor to the inner rotor, the respective connection plates having an outer radial end portion pivotably supported on an inner circumferential portion of the outer rotor and an inner radial end portion slidably received in the respective slots of the inner rotor, the connection plates dividing the space formed between the outer rotor and the inner rotor into a plurality of chambers,
• wherein the outer rotor comprises plate supporting grooves formed on an inner circumferential surface of the outer rotor, and the outer radial end portion of the respective connection plates is pivotably fitted into the respective plate supporting grooves,
• wherein the respective permanent magnets are disposed on the outer circumferential surface of the outer rotor in an angular range defined between respective pairs of the plate supporting grooves which are disposed adjacent to each other in a circumferential direction of the outer rotor, and
• wherein the respective permanent magnets and the respective plate supporting grooves are alternately arranged in the circumferential direction of the outer rotor without overlapping each other.