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Paice; Derek A
Palm Harbor, FL
No. of patents:

Patent Number Title Of Patent Date Issued
6191968 Wye connected 3-phase to 9-phase auto-transformer with reduced winding currents February 20, 2001
In an 18-pulse converter system a 3-phase to 9-phase auto transformer with multiple windings per phase is used to power a 9-phase AC to DC converter. The transformer kVA rating is typically about 55% of the DC load kW. Multiple delta connected coils formed around a basic wye connected
6101113 Transformers for multipulse AC/DC converters August 8, 2000
In a 12-pulse converter system a 3-phase auto transformer with 4 windings per phase is used to power two 6-pulse converter bridges connected in parallel with a large dc filter capacitor. The transformer rating is typically about 40% of the dc kW load. The voltage ratio is typically 1:1
5781428 Transformer for 12-pulse series connection of converters July 14, 1998
In a multi-pulse converter system a three-phase transformer with tapped wye-connected primary winding and isolated delta-connected secondary winding is used to power two 6-pulse converter bridges connected in series to give 12-pulse operation. The transformer equivalent kVA rating is a
5455759 Symmetrical, phase-shifting, fork transformer October 3, 1995
In 12-pulse and 18-pulse AC/DC converter systems a single wye connected auto transformer using appropriate segments of voltage from each phase connected in fork fashion is used to develop 6-phase and 9-phase voltages in a symmetrical manner such that inherent compensation is made for the
5148357 Auto-connected hexagon transformer for a 12-pulse converter September 15, 1992
A 12-pulse converter of lower rating and minimal current harmonics is obtained with an auto-connected regular hexagon transformer including a delta winding in its center.
5124904 Optimized 18-pulse type AC/DC, or DC/AC, converter system June 23, 1992
A 18-pulse converter system operates without interphase transformer and neutral point on the DC side by providing three rectifier bridges across the DC terminals, one rectifier bridge being coupled with the AC terminals and the two other rectifier bridges being operated at + and -40 degr
4876634 Multi-pulse converter system October 24, 1989
In a multiphase AC/DC converter system a single transformer is used having phase shifted tappings drawn from a polygonal succession of long and short windings wherein some of the windings carry only the difference between the outputted currents derived from the tappings.
4719398 Coasting AC motor restart system and method January 12, 1988
A variable frequency adjustable speed motor drive allows restart of a spinning induction motor by initially increasing the frequency of the associated inverter while keeping the DC voltage source thereof low, then by decreasing the frequency of the inverter while monitoring the effective
4698739 12-Pulse motor drive October 6, 1987
The present invention relates to an AC motor drive including two sets of inverters, wherein one transformer is converted on the output of one of the two inverters, the output of the transformer being connected in series with the output of the other inverter.
4674024 High voltage modular inverter and control system thereof June 16, 1987
Low voltage GTO inverter modules are combined to form a high-voltage multi-inverter system by connecting standard modules in a string with isolated DC links. Modular construction is arranged for building multiphase systems. Voltage control is effected by controlling selected modules

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