Inventor
PIEDRA EDWARD D
US6 patents
⚠️ This page may combine multiple inventors who share the name “PIEDRA EDWARD D”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
OTIS ELEVATOR CO
5 patentsUS6459599B1Oct 1, 2002
Determining phase of AC mains in PWM controlled converters without voltage sensors
OTIS ELEVATOR CO30 citations91
US6483271B1Nov 19, 2002
Motor drive parameters
OTIS ELEVATOR CO24 citations90
US8006808B2Aug 30, 2011
Managing an encoder malfunction in an elevator drive system
OTIS ELEVATOR CO4 citations61
US11078049B2Aug 3, 2021
Elevator system including a permanent magnet (PM) synchronous motor drive system
OTIS ELEVATOR CO0 citations59
US11014778B2May 25, 2021
Rescue control and method of operating an elevator system including a permanent magnet (PM) synchronous motor drive system
OTIS ELEVATOR CO0 citations48