Starting system for brushless motor

In a starting system of a brushless motor in a brushless motor apparatus comprising a first static commutation circuit including a first controllable thyristor rectifier, a first thyristor inverter and a first DC reactor inserted in a DC circuit between said first rectifier and first inverter;

• a second static commutation circuit including a second controllable thyristor rectifier, a second thyristor inverter and a second DC reactor inserted in a DC circuit between said second rectifier and said second inverter;
• a power source transformer for supplying three-phase AC voltage having a first phase to said first controllable thyristor rectifier and supplying three-phase AC voltage having a second phase 30 degrees out of phase with said first phase to said second controllable thyristor rectifier and a load including a brushless motor having a rotating motor receiving the outputs of said first and second thyristor inverters;
• wherein said starting system comprises means for causing one of said first and second static commutation circuits to conduct a DC current therethrough and causing the other one of said first and second static commutation circuits conducting a DC current therethrough to be concurrently substantially cut off, for every 30.degree. electrical angle of rotation of the rotor of said brushless motor at the time of starting said brushless motor.