Electric motor with cooling system

An electric motor including a stator, a rotor, a housing, a cooling system, and a motor drive system comprising a circuit board and a plurality of power semiconductors, the housing comprising a stator housing section surrounding the stator and a drive system housing section comprising a base wall, the circuit board mounted on the base wall, the stator housing section and drive system housing section being separate parts assembled and fixed together, wherein the stator housing section comprises an inner circumferential wall and an outer circumferential wall, the inner circumferential wall joined to the outer circumferential wall at a first axial end and both the inner and outer circumferential walls extend from the first axial end to an assembly interface at a second axial end, the cooling system comprising a cooling channel for flow of a cooling liquid therein, the cooling channel formed between and bounded by the inner circumferential wall and the outer circumferential wall and the base wall configured such that the liquid in the cooling channel concomitantly cools both the stator and the motor drive system.