A programmable apparatus is used to determine the running speed of an ac induction motor based on vibration and flux measurements. A first analysis is performed on at least one of the vibration and flux signals according to a first criterion to determine candidate speeds and whether speed will be determined...http://www.google.es/patents/US6087796?utm_source=gb-gplus-sharePatente US6087796 - Method and apparatus for determining electric motor speed using vibration and flux
Method and apparatus for determining electric motor speed using vibration ...
