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Patent Publications

Co-Inventor Patents

Five granted patents and one pending.

List of Patents

Title: Controller for a switched reluctance machine
Abstract: An electric motor controller is disclosed that controls the torque of a switched reluctance motor by an angle controller that eliminates the need for a look-up table. The angle controller employs edge-triggered monostables to generate a single pulse firing signal which is synchronized with rotor position and whose pulse length varies with torque demand. An angle firing circuit utilizing freewheeling is also disclosed.
Inventor: Stephen James Watkins
Assignee: Nidec SR Drives Ltd, Harrogate, UK
Priority: GB 9506975.3 - 4 April, 1995
Patent Family: AU50450/96A, AU707632B2, BRPI9601262A, CA2173419A1, CN1144418A, CN1063298C, DE69606574D1, DE69606574T2, EP0736962A2, EP0736962A3, EP0736962B1, IN193604, JPH8-317680A, JP3668319B2, KR1996-0039579A, KR10-0400516B1, MXP9601241A, SG38957A1, TW288229B, US5789893A, ZA9602766A.
External Links: Espacenet, USPTO, Google Patents

Title: Sensorless rotor position monitoring in reluctance machines
Abstract: A method of monitoring rotor position in a reluctance machine comprises determining the rate of change of current at a particular point at which current in the winding is arranged to freewheel. Preferably the point coincides with alignment of a rotor and a stator pole such that the rate of change of current is predicted to be zero. The magnitude and polarity of any variation from the predicted rate of change indicates a rotor position removed from the actual rotor position and whether it is in advance of, or retreated from, the predicted position.
Inventor: Stephen James Watkins
Assignee: Nidec SR Drives Ltd, Harrogate, UK
Priority: GB 9525952 - 19 December, 1995
Patent Family: DE69607122D1, DE69607122T2, EP0780966A2, EP0780966A3, EP0780966B1, MX9606557A, SG50778A1, US5793179A.
External Links: Espacenet, USPTO, Google Patents

Title: Power supply control for power generator
Abstract: A system (100) for connecting a fuel cell stack to an A.C. grid to provide power thereto is disclosed in which a voltage regulated D. C. bus (110) is provided to be coupled to the fuel cell stack, a bidirectional inverter (120) is coupled to the D. C. bus (110), and is to be coupled between the D. C. bus (110) and the A.C. grid. At least one D. C. auxiliary load (130) of the fuel cell stack is provided coupled to the D.C. bus (110). A D.C. to D. C. converter (140) is provided between the fuel cell stack and the D.C. bus (110).
Inventors: Christopher John Evans, Charles Richard Elliott and Stephen James Watkins
Assignee: Ceres Intellectual Property Company Ltd, West Sussex, UK
Priority: GB 0615562.6 - 4 August, 2006
Patent Family: AU2007280258A1, AU2007280258, BRPI0715350-3A2, CA2660033A1, CA2660033C, CN101501977A, CN101501977B, DE602007033050D1, DK2047590T3, EA200970181A1, EA016526B1, EP2047590A1, EP2047590B1, ES2448581T3, GB2441849A, GB2441849B, HK1127168A1, JP2009-545944A, JP5563819B2, KR10-2009-0042284A, KR10-1490356B1, MX2009001330A, MY147611A, US2008/0067869A1, US7880334B2, WO2008/015461A1.
External Links: Espacenet, USPTO, Google Patents

Title: Method to control a switched reluctance machine
Abstract: A method to control the rotor position in a reluctance machine is disclosed. The method involves energising the phase winding so to move the rotor relative to the stator, freewheeling current through the phase winding over a freewheeling period, sampling rate of change of phase current and amplitude of phase current, de-energising the phase winding and computing the angular position of the rotor.
Inventors: Thomas Langley and Stephen James Watkins
Assignee: Perkins Engines Company Ltd, Peterborough, UK
Priority: EP 12185303.0 - 20 September, 2012
Patent Family: AT977568T, CN104641548A, DE602012043617D1, EP2712075A1, EP2712075B1, US2015/0249408A1, WO2014/044657A2, WO2014/044657A3.
External Links: Espacenet, USPTO, Google Patents

Title: Method to control a switched reluctance motor
Abstract: A method to control the rotor position in a reluctance motor is disclosed. The method comprises the steps of: energising a phase winding to an energised state so as to move a rotor relative to a stator; switching the phase winding between the energised state and a freewheeling state over a pulsing period to produce a plurality of phase current pulses wherein the phase current freewheels in the freewheeling state over a freewheeling period of each current pulse; sampling rates of change of phase current and amplitudes of phase current during a plurality of freewheeling periods; de-energising the phase winding; and computing the angular position of the rotor.
Inventors: John Rutledge and Stephen James Watkins
Assignee: Perkins Engines Company Ltd, Peterborough, UK
Priority: EP 15178610.0 - 28 July 2015
Patent Family: CN106411193A, EP3125424A1, US2017/0033719A1, US9735723B2
External Links: Espacenet, USPTO, Google Patents

Title: A subsea DC to DC voltage converter
Abstract: A subsea DC-DC voltage converter comprising a DC-AC converter 31 and an AC-DC converter 34. The DC-AC converter comprises first 35 and second 36 voltage supply lines between which first 37 and second 38 conversion lines extend. At least one of the conversion lines 37, 38 comprises a plurality of switching stages 14, each switching stage being adapted to be switched between an open configuration in which it has a capacitive input impedance (17, Figs. 3a&3b) and a closed configuration in which switching stage is a closed circuit at DC. A controller 40 controls the switching stages to produce a periodic time varying voltage difference between the first and second output lines. The AC-DC voltage conversion stage 34 comprises a transformer (43, Fig. 7) comprising a primary coil (44, Fig. 7) and at least one secondary coil (45, Fig. 7) the secondary coil(s) (45, Fig. 7) being connected to AC-DC converter(s) (46, Fig. 7). The voltage source (2, Fig. 1) may be connected to the first and second voltage lines via an umbilical cord (5, Fig. 1). The controller switches the switching stages such that: a square wave is output; and no switching stage experiences a voltage greater than the stages breakdown voltage. The switching stages may be a full or half bridge switching stage. The second conversion line may comprise a plurality of capacitors 39 or switching stages connected in series. A low pass filter maybe connected to the output of the rectifier (AC-DC converter).
Inventors: Johathan Stephen Brown and Stephen James Watkins
Assignee: Isotek Oil and Gas Limited, Leeds, UK
Priority: GB 1621148.4 - 13 Deecember 2016
Patent Family: GB2557698A, WO2018/109433A1
External Links: Espacenet, Google Patents

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