Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Peter Richard Mayes0
Norman Neilson Fulton0
Date of Patent
February 15, 2011
0Patent Application Number
127692640
Date Filed
April 28, 2010
0Patent Primary Examiner
Patent abstract
A drive system has a number of electrical machines. One machine operates as a generator supplying an output to a DC link, which in turn supplies one or more machines operating as motors to drive loads. The motors are supplied through power converters. The total capacitance of the DC link is minimized and the link kept in a stable condition by preventing it falling to a hazardous level. One embodiment prevents the phase currents adding in such a manner as to reduce the DC link voltage. Another embodiment employs freewheeling in the phase currents to prevent the DC link voltage falling below a predetermined threshold.
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