Patent ID: 7402968

Claim:
A field winding synchronous generator-motor comprising: an electric rotating machine that includes an armature winding and a field winding, and operates as a generator-motor; a power conversion section that is connected to said electric rotating machine, and has a function to control said electric rotating machine; positional detecting means for detecting a rotor position of said electric rotating machine; a compensation amount storage section that stores a compensation amount capable of improving characteristics of said electric rotating machine from a reference position of a rotor of said electric rotating machine; positional compensation operation section that makes a compensation operation of positional information from a value of said positional detecting means and a value of said compensation amount storage section; a conducting phase storage section that stores a conducting phase to each armature winding of said electric rotating machine from the reference position of said electric rotating machine; and a rectangular wave application voltage command section that commands a rectangular wave application voltage to each armature winding of said electric rotating machine with respect to said power conversion section from a value of said positional compensation operation section and a value of said conducting phase storage section; wherein characteristics of said electric rotating machine are improved.