248:, from where his publications show growing interest in reluctance machines - initially AC-fed synchronous reluctance motors and later doubly-salient synchronous machines such as stepper motors (resulting in numerous further publications throughout the 1970s, often co-authored with research students and colleagues including Austin Hughes, Michael Stephenson, Paul Acarnley, Philip Blenkinsop, Norman Fulton and Jasmin Corda, to name but some of his co-workers). The first seminal paper on switched reluctance machines was published in 1980. He remained at Leeds for 30 years, being promoted to
296:(until then) substantial engineering team. By now, under Nidec's direction, the business unit was already increasingly focused on other motor technologies, notably synchronous permanent magnet machines. Nidec Drive Systems continues to supply SR motors and inverters, but presently only for a minority of customer-specific industrial and off-road vehicle applications.
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of Japan in 2010 (to whom
Emerson sold its entire US-based motor interests). The former SR specialist unit was transferred to Nidec's Drive Systems subsidiary in 2016, but was much reduced in size and scope in 2019 when Nidec ended all manufacturing at the Harrogate site and greatly downsized the
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technology. He also made significant contributions to the analysis and computation of magnetic fields and electrical machines in general, writing several notable text books along with colleagues
Kenneth Binns, Martyn Harris and J. Michael Stephenson and latterly with
524:"Variable-speed switched reluctance motors", P.J. Lawrenson, J.M. Stephenson, P.T. Blenkinsop, J. Corda and N.N. Fulton, IEE Proceedings B - Electric Power Applications, Volume 127, Issue 4, 1980. pp. 253-265
279:, in 1980 he and three colleagues (Michael Stephenson, Bill Ray and Rex Davis) established a design, technology development and licensing business, Switched Reluctance Drives Ltd. Initially based in
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488:"Theory and performance of polyphase reluctance machines", P.J. Lawrenson and L.A. Agu, Proceedings of the Institution of Electrical Engineers, Volume 111, Issue 8, 1964, pp.1435-1445
452:"A self-oscillating induction motor for shuttle propulsion", E.R. Laithwaite and P.J. Lawrenson, Proceedings of the IEE - Part A: Power Engineering, Volume: 104, Issue 14, 1957, p.93
434:"Per-Unit Systems with Special Reference to Electrical Machines (IEE Monograph Series, #4)", M.R. Harris, P.J. Lawrenson and J.M. Stephenson, Cambridge University Press, 1970
515:"Two-speed operation of salient-pole reluctance machines", P.J. Lawrenson, Proceedings of the Institution of Electrical Engineers, Volume 112, issue 12, 1965, pp.2311 - 2316
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497:"Low-inertia reluctance machines", P.J. Lawrenson and L.A. Agu, Proceedings of the Institution of Electrical Engineers, Volume 111, Issue 12, 1964, pp.2017-2025
470:"A new unexcited synchronous machine", P.J. Lawrenson and L.A. Agu, Proceedings of the Institution of Electrical Engineers, Volume 110, Issue 7, 1963, p.1275
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For outstanding contributions to the field of electrical machines, most notably the development and commercialization of switched reluctance drives
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443:"The Analytical and Numerical Solution of Electric and Magnetic Fields", K.J. Binns, P.J. Lawrenson and C.W. Trowbridge, Wiley-Blackwell, 1992
461:"Shuttle propulsion", E.R. Laithwaite and P.J. Lawrenson, Journal of the Institution of Electrical Engineers, Volume 3, Issue 26, 1957, p.96-97
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506:"Development and application of reluctance motors", P.J. Lawrenson, IEE Electronics and Power Journal, Volume 11, Issue 6, 1965, pp. 195-198
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Professor, in order to devote his full-time attention to the growing business he had co-founded in Leeds, Switched
Reluctance Drives Ltd.
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479:"Reluctance machines", P.J. Lawrenson and L.A. Agu, IEE Electronics and Power Journal, Volume 10 Issue 8, 1964, p.264-265
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425:"Analysis and Computation of Electric and Magnetic Field Problems", K.J. Binns and P.J. Lawrenson, Pergamon Press, 1963
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and associated drive technology. Based on research work that had been carried out jointly by the
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in 1994, and whilst still based in the north of
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in 1966. He retired from his chair in 1991 with the title
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792:Fellows of the Royal Academy of Engineering
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169:(12 March 1933 – 27 October 2017) was an
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331:(FRS) in 1982. Lawrenson won the IEEE
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344:Institution of Electrical Engineers
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327:(FREng) in 1980 and of the
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258:Electrical Engineering
242:Electrical Engineering
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201:Lawrenson was born in
178:Electrical Engineering
313:J.A. Ewing Gold Medal
415:Peter John Lawrenson
167:Peter John Lawrenson
18:Peter John Lawrenson
782:Fellows of the IEEE
715:Robert W. Brodersen
691:Michael F. Tompsett
552:Debrett's Biography
346:from 1992 to 1993.
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273:University of Leeds
246:University of Leeds
182:University of Leeds
155:University of Leeds
27:Electrical engineer
539:2012-09-26 at the
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721:M. George Craford
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631:Robert H. Dennard
617:IEEE Edison Medal
564:"Peter Lawrenson"
402:"List of Fellows"
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772:2017 deaths
767:1933 births
745:Kenichi Iga
91:Nationality
761:Categories
350:References
207:Lancashire
60:Merseyside
48:1933-03-12
679:Ray Dolby
673:Tingye Li
289:Harrogate
254:Professor
197:Biography
174:Professor
85:, England
79:Harrogate
62:, England
537:Archived
335:in 2005
311:and the
275:and the
262:Emeritus
238:Lecturer
171:Emeritus
574:25 July
323:of the
315:of the
303:of the
244:at the
203:Prescot
180:at the
94:British
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570:. IEEE
321:Fellow
250:Reader
138:(1983)
131:(2005)
124:(1990)
117:Awards
281:Leeds
135:FREng
576:2011
378:IEEE
221:and
68:Died
42:Born
256:of
240:in
227:GEC
223:DSc
219:MSc
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