Electric pump with permanent magnet, connecting plates and plate holders

An electric pump comprising:

• a housing formed with a suction port and a discharge port and equipped with an annular stator;
• an outer rotor formed in a cylindrical shape and rotatably disposed radially inward of the stator,
• wherein the outer rotor includes a plurality of permanent magnets in an outer circumferential surface of the outer rotor such that the outer rotor cooperates with the stator to define a motor section, and a plurality of plate holding grooves formed in an inner circumferential surface of the outer rotor extend in an axial direction of the outer rotor;
• an inner rotor provided radially inward of the outer rotor and at an eccentric location relative to the outer rotor,
• wherein a plurality of slots are radially formed in an outer circumferential surface of the inner rotor, and a space formed between the inner rotor and the outer rotor communicates with the suction port and the discharge port;
• and
• a plurality of connecting plates each including a head portion and a radially-inner end portion, the head portion being formed in a substantially circular shape in cross section and fitted swingably into a respective plate holding groove of the plurality of plate holding grooves, the radially-inner end portion being slidably fitted into a respective slot of the plurality of slots, the space being partitioned into a plurality of chambers by the plurality of connecting plates,
• wherein each of the plate holding grooves is located within a projection plane of a permanent magnet of the plurality of permanent magnets with respect to a circumferential direction of the outer rotor, and
• wherein the plurality of permanent magnets are fixed in position so as to be attached to an outer circumferential surface of the outer rotor at even intervals from each other.