US 12,255,565 B2
Online monitoring and compensation of stator inter-turn short circuit fault in permanent magnet synchronous machines
Ying Zuo, Montreal (CA); Chunyan Lai, Montreal (CA); and Lakshmi Varaha Iyer, Windsor (CA)
Assigned to MAGNA POWERTRAIN GMBH & CO KG, Lannach (AT)
Appl. No. 18/034,195
Filed by MAGNA INTERNATIONAL INC., Aurora (CA)
PCT Filed Oct. 26, 2021, PCT No. PCT/CA2021/051506
§ 371(c)(1), (2) Date Apr. 27, 2023,
PCT Pub. No. WO2022/087726, PCT Pub. Date May 5, 2022.
Claims priority of provisional application 63/106,583, filed on Oct. 28, 2020.
Prior Publication US 2023/0396204 A1, Dec. 7, 2023
Int. Cl. H02P 29/024 (2016.01); G01R 31/34 (2020.01); G01R 31/56 (2020.01); H02P 21/13 (2006.01)
CPC H02P 29/024 (2013.01) [G01R 31/346 (2013.01); G01R 31/56 (2020.01); H02P 21/13 (2013.01)] 20 Claims
OG exemplary drawing
 
4. A method for compensating an inter-turn short circuit fault in an electric machine, the method comprising:
determining a plurality of phase voltages based on a current command;
applying, by an inverter, the plurality of phase voltages to corresponding windings of a plurality of windings of the electric machine, one of the windings having the inter-turn short circuit fault;
determining phase currents in each of the plurality of windings;
calculating sequence components of the electric machine based on the plurality of phase voltages and the phase currents;
determining a change in fault factor based on the sequence components;
determining if the change in fault factor is greater than a fault threshold value;
estimating, in response to determining the change in fault factor is greater than the fault threshold value, using an unscented Kalman filter, at least one characteristic of the inter-turn short circuit fault, the at least one characteristic including a fault current in the inter-turn short circuit fault;
determining a compensation current based on the fault current in the inter-turn short circuit fault; and
adjusting the current command based on the compensation current to compensate the fault current.