Motor driver circuit for resonant linear cooler

Details Motor driver circuit for resonant linear cooler Motor driver circuit for resonant linear cooler

1989-12-04

1991-07-16

Ro, Bentsu

Electricity: motive power systems

Linear-movement motors

318132, 318293, 62226, 622284, H02K 4102, F25B 102

Patent

active

050327720

ABSTRACT:
A direct current powered, linear resonant cryocooler having a compressor in which the piston is reciprocated by a linear motor at substantially resonant frequency and the length of stroke of the piston is varied as a direct function of cryocooler temperature. There are two control loops, a temperature control loop and a voltage control loop which is independent of the temperature control loop. In the temperature control loop, temperature is sensed at the cryocooler or expander and the temperature signal is compared with a reference temperature signal to produce a temperature error signal or voltage. The voltage control loop controls motor voltage. As input to the voltage control loop, the linear motor voltage is fed back and compared with the temperature error voltage V.sub.TE to produce a voltage level signal V.sub.L in the input of the voltage control loop, representative of the correction required to obtain and then to maintain the cryocooler temperature represented by the reference temperature voltage. Either a pulse width modulated, variable amplitude sine wave signal or a constant duty cycle, pulse width modulated, square wave signal powers the linear motor.

REFERENCES:
patent: 3610782 (1969-10-01), McGuire
patent: 3916271 (1975-10-01), Watanabe et al.
patent: 4027211 (1977-05-01), Omura et al.
patent: 4567726 (1986-02-01), Vitale et al.
patent: 4706470 (1987-11-01), Akazawa et al.
patent: 4893479 (1990-01-01), Gillett et al.

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