To provide a starting method for a brushless dynamo-electric machine that can obtain a large starting torque even when a rotor position detecting element is not used, and which can effect, reliably or with a high probability, normal rotation when a forced commutation is performed.
The starting control for the engine generator is performed as follows: in steps S1, S2, a first and second initial excitation are performed in order to displace the rotor to a prescribed position that can obtain the maximum torque through forced commutation from a state wherein the generator has freely stopped rotating, and further to displace the rotor to a position where the relative rotor-stator positions will effect normal rotation. In step S3, forced commutation, in other words applying current to a single phase from the relative rotor-stator positions that can obtain the maximum torque after completion of the second initial excitation, is performed. Through forced commutation, induced voltage is detected from a non-current carrying phase, and the rotor position is detected based on this induced voltage. Next, the method proceeds to step S4, where normal current application is performed.
INAGAWA TOSHIKI
IIJIMA YOSHIHIRO
WAKITANI TSUTOMU
