A direct current machine monitoring system includes a current sensor for monitoring load current of the machine; and a computer for obtaining a power spectrum in a range including a machine trait-passing frequency, determining a magnitude of a maximum peak in the power spectrum in a range including the...http://www.google.fr/patents/US6507797?utm_source=gb-gplus-shareBrevet US6507797 - Direct current machine monitoring system and method
Direct current machine monitoring system and method
