Annular electromagnetic induction pump

An electromagnetic induction pump of substantially tubular shape extending in a longitudinal direction (X) and comprising:

• a substantially tubular internal inductor comprising a plurality of internal combs and a plurality of internal coils arranged at least between teeth of said internal combs, an inside of said internal inductor forming a cavity;
• an internal tube positioned around the internal inductor;
• a pumping canal allowing the circulation of a fluid that is to be pumped;
• an external tube, the pumping canal being formed between the internal tube and the external tube;
• a substantially tubular external inductor positioned around the external tube and comprising a plurality of external combs and a plurality of external coils positioned at least between the teeth of said external combs;
• the electromagnetic pump further comprising a movement device for moving the internal combs, said movement device being able to cause a radial clearance between said internal combs and the internal tube to vary between a first clearance (J1) wherein no tooth of the internal combs is in contact with said internal tube, and a second clearance (J2) in which all or some of the teeth of said internal combs are in contact with said internal tube, said movement device comprising a first part positioned inside the internal inductor and in connection with the internal combs so as to be able to move them radially, and a second part extending at least partially on the outside of the internal inductor and being connected to the first part in such a way as to control said first part.