This paper describes a fundamental consideration on high speed control
of the orthogonal-core type variable-inductor. The variable-inductor
is applicable to a VAR compensation in the electric power system. The
transient characteristics of the variable-inductor under the condition
of de control are discussed based on simulation and experiment. For h
igh speed operation, we present an instantaneous control of the primar
y current. A simple control circuit using a dc-dc converter is demonst
rated in this paper.