US 12,316,197 B2
Brake resistor design for controlling rotor speed during generator shutdown sequence
Jeremy Liu, Norwalk, CA (US); Liping Zheng, Buena Park, CA (US); and Suratkal P. Shenoy, Mission Viejo, CA (US)
Assigned to Sapphire Technologies, Inc., Cerritos, CA (US)
Filed by Sapphire Technologies, Inc., Cerritos, CA (US)
Filed on Aug. 31, 2022, as Appl. No. 17/823,842.
Prior Publication US 2024/0072607 A1, Feb. 29, 2024
Int. Cl. F01D 21/14 (2006.01); F01D 15/10 (2006.01); H02K 7/18 (2006.01); H02K 11/04 (2016.01); H02P 3/22 (2006.01)
CPC H02K 7/1823 (2013.01) [H02K 11/04 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An apparatus comprising:
an electric generator comprising:
a turbine wheel configured to receive process gas and rotate in response to expansion of the process gas flowing into an inlet of the turbine wheel and out of an outlet of the turbine wheel,
a rotor coupled to the turbine wheel and configured to rotate with the turbine wheel, and
a stationary stator, the electric generator to generate an alternating current upon rotation of the rotor within the stationary stator;
a power electronics system electrically connected to an electrical output of the electric generator and to receive alternating current from the electric generator;
a brake resistor assembly comprising an impedance that matches an impedance of the electric generator; and
a contactor electrically connected the electrical output of the electric generator and configured to connect the electric generator to the brake resistor assembly based on a fault condition.