Invention Grant
- Patent Title: Permanent magnet motor control for electric subsea pump
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Application No.: US15517208Application Date: 2015-10-09
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Publication No.: US10263547B2Publication Date: 2019-04-16
- Inventor: Costin Ifrim
- Applicant: DIRECT DRIVE SYSTEMS, INC.
- Applicant Address: US CA Fullerton
- Assignee: Direct Drive Systems, Inc.
- Current Assignee: Direct Drive Systems, Inc.
- Current Assignee Address: US CA Fullerton
- Agency: Fish & Richardson P.C.
- International Application: PCT/US2015/054962 WO 20151009
- International Announcement: WO2016/057934 WO 20160414
- Main IPC: H02P1/46
- IPC: H02P1/46 ; H02P6/20 ; E21B43/01

Abstract:
A method includes monitoring electrical output in an open control loop from a variable speed drive to a remote permanent magnet motor, the variable speed drive electrically connected to the permanent magnet motor via a power transmission line. The method includes, in response to detecting a variation in the electrical output at the variable speed drive, synchronizing a frequency of a rotor shaft of the permanent magnet motor with a constant electromagnetic field frequency of a stator of the permanent magnet motor for a predetermined period of time. After the predetermined period of time, the method includes increasing the electromagnetic field frequency of the stator to an operational frequency threshold to accelerate the frequency of the rotor shaft of the permanent magnet motor. In response to reaching the operational frequency threshold, the method includes determining an internal position of the rotor based on the variable electromagnetic field frequency.
Public/Granted literature
- US20170302202A1 PERMANENT MAGNET MOTOR CONTROL FOR ELECTRIC SUBSEA PUMP Public/Granted day:2017-10-19
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