Patent ID: 8807965

Claim:
An electromagnetic driven pump comprising, a control system including a microprocessor ( 1 ) and at least one sensor, wherein the microprocessor controls the energy feed to an electromagnet ( 16 ) at which changes in an emitted magnetic field causes a moving part ( 12 ) of the electromagnetic driven pump to perform aa reciprocating movement to achieve a pumping effect and at which at least one position sensor is placed to sense the position of the moving part ( 12 ) in the electromagnetic driven pump, the electromagnet ( 16 ) is oriented to direct the emitted magnetic field entirely in an axial direction of the moving part ( 12 ) when activated, wherein there is no magnetic field acting on the moving part when the electromagnet ( 16 ) is deactivated, the moving part ( 12 ) includes an axle and a disc-shaped portion ( 17 ) extending in a radial direction and facing the electromagnet ( 16 ) in the axial direction, a spring ( 23 ) is radially-positioned around the moving part ( 12 ), with the disc-shaped extension ( 17 ) of the moving part ( 12 ) axially situated between the electromagnet ( 16 ) and the spring ( 23 ), wherein the moving part ( 12 ) reciprocates towards either the spring ( 23 ) or the electromagnet ( 16 ), the at least one position sensor includes at least one optical transmitter ( 2 ) and at least one optical receiver ( 3 ) located adjacent to a side of the electromagnet ( 16 ) which is opposite the side of the electromagnet which faces the disc-shaped portion ( 17 ) of the moving part ( 12 ), the moving part ( 12 ) of the pump is positioned to move between and shade light between the at least one optical transmitter ( 2 ) and the at least one optical receiver ( 3 ) with a size of a shaded area depending on the position of the moving part ( 12 ), the microprocessor ( 1 ) is set to continuously calculate, in relation to the size of the shaded area, instantaneous position of the moving part ( 12 ) from the size of the shaded area, which corresponds to voltage at the at least one optical receiver ( 3 ); and where the microprocessor is set to continuously control said instantaneous position of the moving part ( 12 ) by activating or deactivating the energy feed to the electromagnet ( 16 ) and prevent the disc-shaped portion ( 17 ) from striking the electromagnet ( 16 ), and the electromagnetic driven pump additionally comprising a membrane ( 18 ) to which the moving part ( 12 ) is fastened, and first and second flanges ( 20 , 19 ) situated to clamp the membrane ( 18 ) therebetween and form a pump chamber between the first flange ( 20 ) and the membrane ( 18 ), the pump chamber having an inlet and an outlet.