PURPOSE: To convert electrical energy efficiently into mechanical energy by advancing the start or the end of reference exciting period based on the tendency of variation of the inductance of an exciting winding within a reference exciting period being judged through a variation tendency decision means thereby controlling the power conduction timing.
CONSTITUTION: A counter 12d is fed with rotary angle information and rotary direction information from a rotation detector 40 and counts up/down an internal counter, then the count is fed to a bus 12f when it is requested by an I/O interface 12e or CPU 12a. The I/O interface 12e temporarily stores various target value information fed from an external NC machine 30 and adjust the information passing/receiving timing. Furthermore, the CPU 12a outputs a set excitation signal while monitoring the count being fed from the counter 12a.
HAYASHI TOSHIO
SHIMADA MASAMI
FURUHASHI MASAHIKO
