FIELD: well drilling. SUBSTANCE: motor has shell 3 of flexible material located between rotor 4 and stator 2 and secured in recesses of stator 2 by retainers. Located between shell 3 and stator 4 are chambers. Rotor is made in form of spiral polyhedron with n-1 faces, n chambers. Number and length of chambers are related as indicated in invention description. EFFECT: higher efficiency. 4 dwg
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