MULTIPITCH SPIRAL-TYPE MOTOR Russian patent published in 1997 - IPC

FIELD: mining industry. SUBSTANCE: bottom-face spiral-type motor for frilling bore-holes has sectional spiral-type stator with its components centered in body according to outer cylindrical surfaces and are fixed as to end thrust surfaces between protrusions in body or in adapters, and rotor connected through kinematic device with spindle shaft. End thrust surfaces of stator components are made as surfaces of rotation relative to longitudinal axis of motor ensuring self-aligning of components in circular direction relative to rotor. Ratio between diametrical dimensions of contacting surfaces of rotor and body is 0.96-1.00, and ratio between length of stator component and pitch of its spiral surface is within 0.4-4.5. EFFECT: higher efficiency. 2 cl, 3 dwg