公开(公告)号：US4686834A

公开(公告)日：1987-08-18

申请号：US872314

申请日：1986-06-09

Applicant: Paul F. Haley ,  Brian S. Junk ,  Merle A. Renaud ,  Paul C. Rentmeester

Inventor： Paul F. Haley ,  Brian S. Junk ,  Merle A. Renaud ,  Paul C. Rentmeester

IPC: F04D27/02 ,  F25B1/053 ,  F25B49/02 ,  F25B41/00

CPC classification number: F04D27/0261 ,  F04D27/02 ,  F04D27/0246 ,  F04D27/0284 ,  F25B1/053 ,  F25B49/022 ,  F25B2600/021 ,  Y02B30/741

Abstract: This controller is used for controlling a centrifugal compressor along its path of minimum power consumption while avoiding a surge condition. It is especially useful in a refrigeration system having a variable speed centrifugal compressor with adjustable inlet guide vanes. In such an application, the controller opens the inlet guide vanes enough to satisfy the cooling demand and then, to minimize power consumption, reduces the speed of the compressor while further opening the vanes (compensating for the reduced speed) until either the inlet guide vanes are fully open or an impending surge condition is detected. The onset of a surge condition is detected by monitoring motor current fluctuations. When fluctuations above a predetermined amplitude occur in excess of a predetermined frequency, the controller determines that a surge is impending. The controller continues to control the compressor in this manner, providing a capacity that is minimally above a level that would cause a surge yet is sufficient to satisfy the cooling demand.

Abstract translation: 该控制器用于沿其最小功耗的路径控制离心式压缩机，同时避免浪涌状况。 特别适用于具有可调进口导向叶片的变速离心式压缩机的制冷系统。 在这种应用中，控制器打开入口导流叶片以满足冷却需求，然后为了最小化功率消耗，在进一步打开叶片（补偿降低的速度）的同时降低压缩机的速度，直到入口导向叶片 完全打开或者即将发生喘振状态。 通过监测电机电流波动来检测浪涌状态的开始。 当超过预定频率的波动超过预定频率时，控制器确定浪涌即将到来。 控制器以这种方式继续控制压缩机，提供最小程度高于会导致浪涌但足以满足冷却需求的能力的容量。

公开(公告)号：US5936514A

公开(公告)日：1999-08-10

申请号：US720120

申请日：1996-09-27

Applicant: Stephen D. Anderson ,  Theodore L. Johnson ,  Brian S. Junk ,  Michael A. Orman ,  Theodore H. Schnaare ,  David E. Tetzlaff

Inventor： Stephen D. Anderson ,  Theodore L. Johnson ,  Brian S. Junk ,  Michael A. Orman ,  Theodore H. Schnaare ,  David E. Tetzlaff

IPC: G08C19/02 ,  H02M7/219 ,  H04M11/04

CPC classification number: H02M7/219 ,  G08C19/02 ,  Y10T307/858 ,  Y10T307/865

Abstract: A field instrument includes an input circuit having a transistor bridge rectifier which is couplable to a power supply. The transistor bridge rectifier is configured to provide power from the power supply to a remainder of the field instrument.

Abstract translation: 现场仪表包括具有可与电源耦合的晶体管桥式整流器的输入电路。 晶体管桥式整流器被配置为从电源向现场仪器的其余部分提供电力。

公开(公告)号：US4751653A

公开(公告)日：1988-06-14

申请号：US900043

申请日：1986-08-25

Applicant: Brian S. Junk ,  Robert E. Krocker ,  Tony J. Wood

Inventor： Brian S. Junk ,  Robert E. Krocker ,  Tony J. Wood

IPC: H02H3/253 ,  H02H3/353 ,  H02H11/00 ,  H02H3/26 ,  G01R19/00 ,  G01R25/00

CPC classification number: H02H3/253 ,  H02H3/353 ,  H02H11/004

Abstract: A microcomputer based fault detector for identifying a phase reversal, a phase loss, and a power loss in three-phase circuits. A microcomputer samples a pattern of timing signals generated in response to three current transformers associated with each of the three phases. The changing pattern of timing signals represent the phase relationship of each of the three phases. The sampling rate of the microcomputer is synchronized to the alternating current in each of the three phases by an interrupt signal indirectly generated by one of the phases. In the absence of current in this interrupt generating phase, a backup interrupt, internal to the microcomputer, is enabled which directs the microcomputer to determine if the absence of the first interrupt is due to a phase loss or a power loss. Either interrupt prompts the microcomputer to sample the pattern of signals and compare it to a predetermined pattern. By counting any deviant patterns and classifying them as characteristic of either a phase reversal, phase loss, or power loss, the microcomputer identifies the specific fault as the occurrence of a predetermined number of deviant patterns within a classification.

Abstract translation: 一种基于微机的故障检测器，用于识别三相电路中的相位反相，相位损耗和功率损耗。 微型计算机采样响应于与三相中的每一个相关联的三个电流互感器产生的定时信号的模式。 定时信号的变化模式表示三相中每一相的相位关系。 微机的采样率通过由相位之一间接产生的中断信号与三相中的每一相中的交流电流同步。 在该中断产生阶段没有电流的情况下，启用微机内部的备用中断，其指示微型计算机确定是否缺少第一个中断是由于相丢失或功率损耗引起的。 任一中断都会提示微机采样信号模式并将其与预定模式进行比较。 通过计数任何异常模式并将其分类为相位反相，相位丢失或功率损耗的特征，微机将特定故障识别为分类中预定数量的偏差模式的发生。