Pump with a modular construction

A pump comprising:

• a pump device having a pump housing and a pump housing rim;
• an electric motor comprising:
• a drive shaft coupled to the pump device, and
• a motor housing having a housing wall and a motor housing rim, the housing wall includes a bearing plate and a circumferential groove, the housing wall detachably arranged on the motor housing rim in a region of a circumferential groove which encircles a rim of the bearing plate;
• and
• a motor controller for controlling the electric motor, the motor controller supported by an electrics housing, the electrics housing is detachably attached to the pump housing on a side of the pump housing that faces away from the electric motor,
• wherein the pump housing is detachably arranged by way of an edge, which encircles an inside of the pump housing rim, on the bearing plate of the electric motor, and wherein the circumferential groove and a portion of the pump housing adjacent to the circumferential groove are jointly adjacent to the edge of the pump housing.