Circuit arrangement for driving a reciprocating piston in a cylinder of a linear compressor for generating compressed gas with a linear motor

摘要

In a linear compressor driving apparatus, a position instructing portion (31) outputs a position instruction value Pref of a piston in accordance with an equation A*sin omega t. A position control portion (33) calculates a speed instruction value Vref by multiplying difference between position instruction value Pref and position present value Pnow by a constant Gv. A speed control portion (35) calculates a current instruction value Iref by multiplying a difference between speed instruction value Vref and speed present value Vnow by a constant Gi. A current control portion (37) controls a power source (3) so that current present value Inow becomes equal to the current instruction value Iref. Phase control portion (38) adjusts omega and Gi so as to eliminate phase difference between speed present value Vnow and current instruction value Iref. Since thrust of linear motor can be directly and appropriately controlled in accordance with the load condition, high efficiency is obtained.