FIELD: automatics. SUBSTANCE: with connection of power supply source 4 voltage is minimal across armature winding 1 of electric motor and is maximum across resistor. As electric motor speeds up voltage across starting resistor 2 decreases but it grows across armature winding 1. In this case light radiator is not excited and thyristor 3 is switched off. When voltage reaches value of excitation voltage of light radiator 6 the latter excites and provides for switching on of thyristor 3 which shunts starting resistor 2. EFFECT: enhanced reliability of start of electric motor. 1 dwg
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