Motor drive system

In a motor drive system operating for feedback control of a motor, the improvement comprising

• a first interface part comprising a plurality of interfaces according to the kind of host controllers for generating command signals;
• a sensor interface part comprising an interface of a sensor for detecting rotations of said motor;
• a main control part for generating a control signal for feedback control of said motor according to a command signal received from said first interface part and a detection signal received from said sensor interface part, and comprising a gain table for coordinating a natural frequency of the position control system of said motor, a DC gain of a speed control part provided in the main control part, and an integral limiter value of the output of an integrator on a position control part provided in the main control part with optimal control parameters according to said values;
• a power control part for amplifying a current according to said control signal and for feeding the amplified current to coils of said motor;
• and
• a tuning part comprising a natural frequency setting switch, a DC gain setting switch and an integral limiter value setting switch, wherein a natural frequency, a DC gain and an integral limiter value are set in a plurality of stages within a predetermined range, an optimal control parameter is read out from said gain table according to at least one of set natural frequency, DC gain and integral limiter value, for use in control of said main control part;
• wherein
• said first interface part, said sensor interface part, said main control part, and said power control part are separate and modularized as cards.