Invention Grant
- Patent Title: Digital logic control system for three-phase submersible pump motor
- Patent Title (中): 三相潜水泵电机数字逻辑控制系统
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Application No.: US583718Application Date: 1975-06-04
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Publication No.: US4021700APublication Date: 1977-05-03
- Inventor: David R. Ellis-Anwyl
- Applicant: David R. Ellis-Anwyl
- Applicant Address: IL Chicago
- Assignee: Borg-Warner Corporation
- Current Assignee: Borg-Warner Corporation
- Current Assignee Address: IL Chicago
- Main IPC: H02H3/13
- IPC: H02H3/13 ; H02H7/08 ; H02H7/09
Abstract:
Complete protection of a three-phase submersible pump motor, such as the type used downhole in an oil well, is obtained with a solid state digital logic control system that monitors each of the three phase currents and shuts the pump motor down if any of those phase currents indicates either an underload or overload condition. Time delays are introduced before shutdown to avoid undesired nuisance shutdowns otherwise caused by transient or momentary conditions. When the pump motor is de-energized in response to an underload condition, it is automatically restarted after a predetermined time delay. All of the delay functions are precisely determined by division of the power line frequency. Downhole pressure and temperature are also sensed and if they become excessive the motor is automatically de-energized to prevent overheating. The presence of an auxiliary physical condition, such as filling up a retaining tank, also causes the pump motor to be turned off.
Public/Granted literature
- USD344996S Golf ball dispensing and teeing machine Public/Granted day:1994-03-08
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