초록 ▼

A first static commutator including a first controllable thyristor rectifier and a first thyristor inverter and a second static commutator including a second controllable thyristor rectifier and a second thyristor inverter are provided. First three-phase AC voltage is supplied to the first controlla

A first static commutator including a first controllable thyristor rectifier and a first thyristor inverter and a second static commutator including a second controllable thyristor rectifier and a second thyristor inverter are provided. First three-phase AC voltage is supplied to the first controllable rectifier, and second three-phase AC voltage 30 degrees out of phase with said first three-phase AC voltage is supplied to the second controllable rectifier. A brushless motor includes first star-connected three-phase windings receiving the output of the first inverter and second star-connected three-phase windings and 30 degrees out of phase with said first three phase windings. During the starting period of the brushless motor the conduction of the first and second satic commutators is switched for every 30-degree rotation of the brushless motor.

대표청구항 ▼

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 sec

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°electrical angle of rotation of the rotor of said brushless motor at the time of starting said brushless motor.