Patent ID: 11967818
Assignee: AMAZON TECHNOLOGIES, INC.
Field: Transport (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 0:
1. An unmanned aerial vehicle (UAV), comprising:
a plurality of propulsion mechanisms; and
a motor drive and control system associated with and configured to drive a respective one of the plurality of propulsion mechanisms, each motor drive and control system including:
a direct current (DC) portion electrically coupled to an alternating current (AC) portion, wherein the AC portion generates a three-phase signal to drive the respective one of the plurality of propulsion mechanisms;
an AC high-threshold overcurrent protection mechanism configured to monitor currents associated with each phase of the three-phase signal and trigger a high-threshold overcurrent fault condition based at least in part on the monitored currents associated with each phase of the three-phase signal;
an AC low-threshold overcurrent protection mechanism configured to monitor the currents associated with each phase of the three-phase signal and trigger a low-threshold overcurrent fault condition based at least in part on the monitored currents associated with each phase of the three-phase signal;
a first ground fault protection mechanism configured to monitor a DC positive current and a DC negative current and trigger a first ground fault condition based at least in part on the monitored DC positive current and the DC negative current;
a second ground fault protection mechanism configured to monitor the DC positive current and the currents associated with each phase of the three-phase signal and trigger a second ground fault condition based at least in part on the monitored DC positive current and the currents associated with each phase of the three-phase signal;
a current imbalance protection mechanism configured to monitor the currents associated with each phase of the three-phase signal and trigger a current imbalance fault condition based at least in part on the monitored currents associated with each phase of the three-phase signal;
a DC open protection mechanism configured to monitor a DC bus voltage and at least one of the DC positive current or the DC negative current and trigger a DC open fault condition based at least in part on the monitored DC bus voltage and the at least one of the DC positive current or the DC negative current; and
a DC overcurrent protection mechanism configured to monitor the DC positive current and trigger a DC overcurrent fault condition based at least in part on the monitored at least one of the DC positive current.