US 12,451,829 B2
Variable frequency drive synchronous reluctance motor system with volts-per-Hertz control
Timothy R. Albers, St. Charles, MO (US); Eric Coupart, Clayton, MO (US); Michael L. McClelland, Champniers (FR); Sheng-Chan Yen, Tainan (TW); Guo-Jhih Yan, Tainan (TW); Ta-Yin Luo, Tainan (TW); Yu-Wei Hsu, Tainan (TW); Pei-Chun Shih, Tainan (TW); and Cheng-Tsung Liu, Kaohsiung (TW)
Assigned to Nidec Motor Corporation, St. Louis, MO (US)
Appl. No. 18/573,307
Filed by Nidec Motor Corporation, St. Louis, MO (US)
PCT Filed Jun. 22, 2022, PCT No. PCT/US2022/034562
§ 371(c)(1), (2) Date Dec. 21, 2023,
PCT Pub. No. WO2022/271854, PCT Pub. Date Dec. 29, 2022.
Claims priority of provisional application 63/213,446, filed on Jun. 22, 2021.
Prior Publication US 2024/0291412 A1, Aug. 29, 2024
Int. Cl. H02P 25/092 (2016.01); H02P 27/04 (2016.01)
CPC H02P 25/092 (2016.02) [H02P 27/047 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A variable frequency drive motor system comprising:
one or more synchronous reluctance motors, each synchronous reluctance motor including a stator and a rotor, and each rotor including—
a longitudinal axis and four quadrants circumferentially arranged about the longitudinal axis,
a plurality of curved, spaced-apart barrier slots contained within each quadrant and extending parallel to the longitudinal axis, and
a conductive cage including—
a conductive material located in at least some of the plurality of curved, spaced-apart barrier slots to create a plurality of curved, spaced-apart conductive rotor bars contained within each quadrant and extending parallel to the longitudinal axis between a first end and a second end, and
first and second conductive end rings located at longitudinally opposite ends of rotor, with the first conductive end ring in electrical contact with the first end of the plurality of curved, spaced-apart conductive rotor bars and the second conductive end ring in electrical contact with the second end of the plurality of curved spaced-apart conductive rotor bars; and
a variable frequency drive controller including an inverter and configured to control a motor speed and a motor torque of the one or more synchronous reluctance motors by varying a motor input frequency and a voltage in an open-loop mode by adjusting the voltage magnitude of an output of the inverter to each synchronous reluctance motor to match a required load torque in a volts-per-Hertz relationship.