Electric water pump

An electric water pump, comprising:

• a pump housing, a stator assembly disposed in the pump housing and a rotor assembly matching with the stator assembly;
• wherein the rotor assembly comprises an iron core body, a first plastic coating layer, a second plastic coating layer and a plurality of magnetic sheets,
• wherein the iron core body is provided with a central through-hole, the plurality of magnetic sheets are disposed in the iron core body, the first plastic coating layer and the second plastic coating layer are configured for enclosing the iron core body;
• at least one protruding rib is disposed on a top surface and/or a bottom surface of the first plastic coating layer, and at least one recess matching with the at least one protruding rib is disposed on the second plastic coating layer, and
• the first plastic coating layer is able to cause the second plastic coating layer to rotate relative to an axis of the central through-hole of the iron core body by cooperation between the at least one protruding rib and the at least one recess;
• a plurality of positioning grooves is disposed on an outer surface of the first plastic coating layer, and the plurality of positioning grooves matches with the plurality of magnetic sheets one by one, respectively;
• each of the plurality of positioning grooves is disposed on a mid-vertical plane of corresponding one of the plurality of magnetic sheets, the plurality of positioning grooves is configured to facilitate magnetizing the plurality of magnetic sheets.