FIELD: automated electric drives using thyristor and transistor power amplifiers. SUBSTANCE: electric drive system with DC motor has main speed control circuit, relay current feedback implemented by nonlinear element of DEAD ZONE type, and mean current square feedback using second F(i)=i2signi function nonlinear, element, averaging filter, and multiplier. EFFECT: reduced energy loss, improved reliability in comprehensive range of speed and load variations. 7 dwg
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