A fluid tight spoke type rotor

The present invention proposes a fluid tight spoke type rotor for an electric motor and a method for its manufacture. Said rotor comprises an injection molded rotor core having a first lateral side and a second lateral side and a central opening for inserting shaft. Said lateral sides are interconnected to each other by at least a connecting rod which is formed integrally with said first and second lateral sides each of said first and second lateral sides comprises a plurality magnet slots and a plurality of lamination stack slots and each magnet slot is followed by a respective lamination stack slot in the peripheral direction of the rotor. Said slots extend in the radial direction of the rotor among said first and second lateral sides and are adapted to accommodate, respectively, a magnet and a lamination stack in each of said slots. Said rotor further comprises an injection molded casing covering entire cylindrical outer periphery of the rotor and at least partially, the outer faces of said first and second lateral sides such that the rotor is made fluid tight.