ELECTRICAL INDUCTION MACHINE Russian patent published in 1999 - IPC

FIELD: electrical and electromechanical engineering. SUBSTANCE: electrical machine has conducting rotor free to rotate relative to stator. Novelty is that rotor-to-stator air gap (δ) is found from formula δ = (D_s-D_r)/2>A+D_r/B+U/C,, where D_r is rotor outer diameter, mm; D_s is stator inner diameter, mm; U is peripheral speed, mps; δ is air gap, mm; A is constant of magnitude 0.3, preferred values 0.7-1.5, adequate value 1; B is constant of magnitude г150, preferred values 50-100, adequate value 70; C is constant of magnitude г1200, preferred values 300-600, adequate value 400, mps/mm. Rotor peripheral speed U in this case is higher than 100 mps. EFFECT: reduced heat, magnetizing, hysteresis, and eddy-current losses. 27 cl, 4 dwg