US 10,892,664 B2
Segmented electrical machine
Ellis F H Chong, Derby (GB); Shanmukha Ramakrishna, Singapore (SG); Vaiyapuri Viswanathan, Singapore (SG); and Shuai Wang, Singpore (SG)
Assigned to ROLLS-ROYCE plc, London (GB)
Filed by ROLLS-ROYCE plc, London (GB)
Filed on Sep. 7, 2018, as Appl. No. 16/124,240.
Claims priority of application No. 1714785.1 (GB), filed on Sep. 14, 2017.
Prior Publication US 2019/0081532 A1, Mar. 14, 2019
Int. Cl. H02K 7/04 (2006.01); H02K 7/18 (2006.01); H02K 7/09 (2006.01); F01D 15/10 (2006.01); H02K 19/10 (2006.01); H02K 11/30 (2016.01); F01D 15/00 (2006.01); H02K 1/24 (2006.01); H02K 41/03 (2006.01); F01D 5/02 (2006.01); H02K 1/14 (2006.01); F02C 7/268 (2006.01); F02C 7/32 (2006.01)
CPC H02K 7/04 (2013.01) [F01D 15/00 (2013.01); F01D 15/10 (2013.01); H02K 1/246 (2013.01); H02K 7/09 (2013.01); H02K 7/1823 (2013.01); H02K 11/30 (2016.01); H02K 19/103 (2013.01); F01D 5/027 (2013.01); F02C 7/268 (2013.01); F02C 7/32 (2013.01); F05D 2220/323 (2013.01); F05D 2220/768 (2013.01); F05D 2260/96 (2013.01); H02K 1/148 (2013.01); H02K 41/03 (2013.01); H02K 2201/15 (2013.01); H02K 2213/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electrical machine having:
a variable reluctance rotor, and
a stator formed as an annular array of stator segments, wherein reluctance of the rotor-to-stator magnetic flux path varies with rotor position, and wherein the stator segments are magnetically energizable to rotate the rotor;
wherein:
the stator segments are non-axisymmetrically distributed in the array such that, when energized to rotate the rotor, the stator segments produce an unbalanced force on the rotor; and
the electrical machine further has a compensator including one or more balancing segments, each balancing segment comprising a core structure and a conductor winding mounted to the core structure, the winding being configured to be magnetically energizable by electrical excitation by a control system to produce a balancing force on the rotor, wherein the balancing force balances the unbalanced force, wherein reluctance of a rotor-to-compensator magnetic flux path is substantially invariant with rotor position.