US 12,273,056 B2
Fault detection system for multiphase machines
Akm Arafat, Blaine, MN (US); Bradford K. Palmer, Ham Lake, MN (US); and Dakshina S. Murthy-Bellur, Plymouth, MN (US)
Assigned to Cummin Inc., Columbus, IN (US)
Appl. No. 18/023,148
Filed by Cummins Inc., Columbus, IN (US)
PCT Filed Sep. 1, 2021, PCT No. PCT/US2021/048593
§ 371(c)(1), (2) Date Feb. 24, 2023,
PCT Pub. No. WO2022/051320, PCT Pub. Date Mar. 10, 2022.
Claims priority of provisional application 63/074,098, filed on Sep. 3, 2020.
Prior Publication US 2023/0344377 A1, Oct. 26, 2023
Int. Cl. H02P 25/22 (2006.01); G01R 31/34 (2020.01); H02P 29/024 (2016.01)
CPC H02P 25/22 (2013.01) [H02P 29/0243 (2016.02); G01R 31/343 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for operating a processing system to identify one or more of (1) a phase AB fault, (2) a phase BC fault, (3) a phase CA fault, (4) a phase DE fault, (5) a phase EF fault, or (6) a phase DF fault in an electric machine system including a multiphase machine having a plurality of sets of windings, wherein the multiphase machine includes first and second winding sets, comprising:
receiving parameter information representative of electrical operating parameters of the multiphase machine;
determining symmetrical components based on the parameter information, including determining:
a positive sequence value PS1, negative sequence value NS1 and zero sequence value ZS1 for the first winding set; and
a positive sequence value PS2, negative sequence value NS2 and zero sequence value ZS3 for the second winding set; and
comparing the symmetrical components PS1, NS1, ZS1, PS2, NS2, ZS2 to fault information defining the faults with respect to predetermined symmetrical component fault values; and
identifying faults based on the comparison, including:
identifying a Phase AB fault when: magnitudes NS1 and ZS1 are about equal and finite values, PS2 is about a finite value, and NS2 and ZS2 are about zero, and phase angle of NS1 is about −120 degrees, and phase angle of ZS1 is about 120 degrees;
identifying a Phase BC fault when: magnitudes NS1 and ZS1 are about equal and finite values, PS2 is about a finite value, and NS2 and ZS2 are about zero, and phase angle of NS1 is about 0 degrees, and phase angle of ZS1 is about 0 degrees;
identifying a Phase CA fault when: magnitudes NS1 and ZS1 are about equal and finite values, PS2 is about a finite value, and NS2 and ZS2 are about zero, and phase angle of NS1 is about 120 degrees, and phase angle of ZS1 is about −120 degrees;
identifying a Phase DE fault when: magnitudes NS2 and ZS2 are about equal and finite values, PS1 is about a finite value, and NS1 and ZS1 are about zero, and phase angle of NS2 is about −150 degrees, and phase angle of ZS2 is about 90 degrees;
identifying a Phase EF fault when: magnitudes NS2 and ZS2 are about equal and finite values, PS1 is about a finite value, and NS1 and ZS1 are about zero, and phase angle of NS2 is about −30 degrees, and phase angle of ZS2 is about −30 degrees; or
identifying a Phase DF fault when: magnitudes NS2 and ZS2 are about equal and finite values, PS1 is about a finite value, NS1 and ZS1 are about zero, and phase angle of NS2 is about 90 degrees, and phase angle of ZS2 is about −150 degrees.