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公开(公告)号：US5017854A
公开(公告)日：1991-05-21
申请号：US604293
申请日：1990-10-29
CPC分类号： F04B35/045 , H02P7/29 , F04B2201/0206 , F04B2203/0402
摘要： A control system for controlling a direct current powered motor in which the direct current voltage, which may not be constant, is reversibly commutated across the coil or winding of the motor during the predetermined commutation time intervals and chopped at high frequency during each commutation time interval by a variable duty cycle, pulse width modulated voltage, in which the width of each voltage pulse, determined by a reference voltage, is varied as an inverse function of the magnitude of the direct current voltage which exists during each voltage pulse interval.
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公开(公告)号：US5023531A
公开(公告)日：1991-06-11
申请号：US195914
申请日：1988-05-19
申请人： George A. Altemose , Michael Consi , Edwin R. Joscelyn , William Wiemann , David B. Giguere , Wilfred J. Gully , Stanley E. Spencer
发明人： George A. Altemose , Michael Consi , Edwin R. Joscelyn , William Wiemann , David B. Giguere , Wilfred J. Gully , Stanley E. Spencer
CPC分类号： H02P6/12 , F25B49/025 , G05D23/1913 , G05D23/20
摘要： A refrigeration control apparatus especially adapted for use in conjunction with cryogenic coolers includes a brushless variable speed drive motor for powering a mechanical cooler-compressor and electronic control circuitry coupled to the motor allowing motor speed and hence cooling rate to be responsive to changes in the temperature of the volume sought to be cooled. A signal corresponding to sensed temperature is compared to a reference signal derived from motor speed. The difference therebetween used to vary the duty cycle of a high frequency pulse train. The pulse train is used to modulate the drive current applied to the motor through pulse position switching circuitry to vary the speed of the drive motor. High and low motor speed limits are provided along with sensor failure protection circuitry to insure continuous motor operation between chosen limits.
摘要翻译： 特别适合与低温冷却器一起使用的制冷控制装置包括用于给机械冷却器和压缩机供电的无刷变速驱动电机和耦合到电动机的电子控制电路，允许电动机转速并因此响应于温度变化的冷却速度 的体积试图冷却。 将对应于感测温度的信号与从电机速度导出的参考信号进行比较。 它们之间的差异用于改变高频脉冲串的占空比。 脉冲串用于通过脉冲位置切换电路调制施加到电机的驱动电流，以改变驱动电机的速度。 提供高电机和低电机速度限制以及传感器故障保护电路，以确保连续电机在选定极限之间运行。
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公开(公告)号：US5032772A
公开(公告)日：1991-07-16
申请号：US445507
申请日：1989-12-04
申请人： Wilfred J. Gully , Paul M. Okada
发明人： Wilfred J. Gully , Paul M. Okada
CPC分类号： F25B49/022 , F25B9/14 , H02P7/03 , F25B2309/001 , F25B2309/1428
摘要： 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.
摘要翻译： 具有压缩机的直流供电的线性谐振低温冷却器作为低温冷却器温度的直接函数而变化，其中活塞通过线性电动机以基本共振频率往复运动，活塞的行程长度变化。 有两个控制回路，一个温度控制回路和一个独立于温度控制回路的电压控制回路。 在温度控制回路中，在低温冷却器或膨胀器处感测温度，并将温度信号与参考温度信号进行比较，以产生温度误差信号或电压。 电压控制回路控制电机电压。 作为电压控制回路的输入，反馈线性电动机电压并与温度误差电压VTE进行比较，以在电压控制回路的输入端产生电压电平信号VL，代表获得然后维持所需的校正 低温冷却器温度由参考温度电压表示。 脉冲宽度调制，可变幅度正弦波信号或恒定占空比，脉冲宽度调制，方波信号为线性电机供电。
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