Circuit arrangement for driving a reciprocating piston in a cyli

Details Circuit arrangement for driving a reciprocating piston in a cyli Circuit arrangement for driving a reciprocating piston in a cyli

1997-04-18

1999-11-09

Freay, Charles G.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

F04B 4900

Patent

active

059802111

ABSTRACT:
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.

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patent: 4750871 (1988-06-01), Curwen
patent: 5535593 (1996-07-01), Wu et al.

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