A pump is provided with a motor arranged in a stator case, wherein a junction box is arranged at one axial end of the stator case, the junction box is provided with a tubular shell component, the first axial end of the tubular shell component is placed at the axial end of the stator case, the opposite second axial end of the tubular shell component is sealed through at least one cover piece, an operation display circuit board and a motor driving circuit board are arranged in the tubular shell component. The tubular shell component and the containing box are not provided with conductive contact pins.