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However, it has become apparent to practitioners in the art that several significant advantages favor AC motors rather than DC motors in such power systems. This was due primarily to the ease with which the speed and load characteristics of a DC motor are controlled. Initially, the increased use of electrical power to fulfill such needs resulted in application of the DC motor as the primary source of such variable frequency power. Typical applications are found in pumping systems, fans, textile agitators and textile dying devices. There exist in many industrial and commercial applications a requirement for variable frequency or variable speed drive electric power systems.
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Assignors: COOPER INDUSTRIES, INC., A CORP.
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reassignment COOPER SERVICES, 1001 FANNIN, HOUSTON, TEXAS 77002 A CORP. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by McGraw Edison Co filed Critical McGraw Edison Co Priority to US06/061,016 priority Critical patent/US4249120A/en Application granted granted Critical Publication of US4249120A publication Critical patent/US4249120A/en Assigned to COOPER SERVICES, 1001 FANNIN, HOUSTON, TEXAS 77002 A CORP. Original Assignee McGraw Edison Co Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)ĬOOPER SERVICES 1001 FANNIN HOUSTON TEXAS 77002 A CORP OF DE Earle Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US06/061,016 Inventor Kent L.
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Google Patents Variable speed induction motor control systemÄownload PDF Info Publication number US4249120A US4249120A US06/061,016 US6101679A US4249120A US 4249120 A US4249120 A US 4249120A US 6101679 A US6101679 A US 6101679A US 4249120 A US4249120 A US 4249120A Authority US United States Prior art keywords motor voltage coupled current power factor Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US4249120A - Variable speed induction motor control system US4249120A - Variable speed induction motor control system