Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8497655 | Method and apparatus for estimating rotor position in a sensorless synchronous motor | Jingbo Liu, Semyon Royak, Thomas A. Nondahl, Peter B. Schmidt | 2013-07-30 |
| 8330405 | Method and apparatus for increased current stability in a PWM drive | Semyon Royak, Thomas A. Nondahl, Jingbo Liu, Peter B. Schmidt, Robert J. Breitzmann | 2012-12-11 |
| 8228013 | Method and apparatus for automatically identifying electrical parameters in a sensor-less PMSM | Jingbo Liu, Thomas A. Nondahl, Peter B. Schmidt, Semyon Royak | 2012-07-24 |
| 8115437 | Torque limit of PM motors for field-weakening region operation | Semyon Royak | 2012-02-14 |
| 8009450 | Method and apparatus for phase current balance in active converter with unbalanced AC line voltage source | Semyon Royak, Robert J. Breitzmann | 2011-08-30 |
| 7944164 | Method and apparatus for identifying orientation of a stationary rotor in a sensor-less PMSM | Jingbo Liu, Thomas A. Nondahl, Peter B. Schmidt, Semyon Royak | 2011-05-17 |
| 7915852 | Universal adaptive torque control for PM motors for field-weakening region operation | Semyon Royak, Robert J. Breitzmann, Thomas A. Nondahl, Peter B. Schmidt, Jingbo Liu | 2011-03-29 |
| 7609014 | System and method for universal adaptive torque control of permanent magnet motors | Semyon Royak, Jingbo Liu, Peter B. Schmidt, Thomas A. Nondahl, Robert John Breitzman | 2009-10-27 |
| 7479756 | System and method for protecting a motor drive unit from motor back EMF under fault conditions | John M. Kasunich, Daniel Pixler, Brian T. Concannon, Michael J. Melfi, Semyon Royak | 2009-01-20 |
| 7106024 | Filter with increased first harmonic response and reduced phase shift in a wide frequency band for encoderless drive applications | Semyon Royak | 2006-09-12 |
| 6831440 | Flux position identifier using high frequency injection | Semyon Royak | 2004-12-14 |
| 6703809 | Flux position identifier using high frequency injection with the presence of a rich harmonic spectrum in a responding signal | Semyon Royak, Russel J. Kerkman | 2004-03-09 |
| 6636012 | Stator and rotor resistance identifier using high frequency injection | Semyon Royak, Russel J. Kerkman | 2003-10-21 |
| 5428557 | Sheet material coil counter | Lawrence M. Sears | 1995-06-27 |