公开(公告)号：US11581835B1

公开(公告)日：2023-02-14

申请号：US17360946

申请日：2021-06-28

Applicant: Amazon Technologies, Inc.

Inventor： Lizon Maharjan ,  Xiaoqi Wang

IPC: H02P21/16 ,  H02P21/14 ,  H02P21/18 ,  H02P21/22

Abstract: Techniques and apparatus for determining the temperature of a permanent magnet on a rotor of an electrical motor. An example techniques involves determining a first set of parameters for controlling the electrical motor. A temperature of the rotor during a runtime of the electrical motor is determined, based at least in part on the first set of parameters and a first back-electromotive force (back-emf) associated with the electrical motor. A first estimate of a magnetic flux of the permanent magnet is determined based on the temperature of the rotor. An operation of the electrical motor is controlled based at least in part on the first estimate of the magnetic flux of the permanent magnet.

公开(公告)号：US11967818B1

公开(公告)日：2024-04-23

申请号：US17708120

申请日：2022-03-30

Applicant: Amazon Technologies, Inc.

Inventor： Lizon Maharjan ,  Frederic Pierre Lacaux ,  Dean Joseph Brestel ,  Xiaoqi Wang ,  Andrew Lueneburg ,  Marc Ian Feifel

IPC: H02H7/085 ,  B64C39/02 ,  B64D27/24 ,  B64D31/00 ,  H02H7/08 ,  B64U50/19

CPC classification number: H02H7/0811 ,  B64C39/024 ,  B64D27/24 ,  B64D31/00 ,  B64U50/19

Abstract: Described are systems and methods for monitoring, detecting, and/or protecting various systems of an aerial vehicle, such as an unmanned aerial vehicle (UAV). Embodiments of the present disclosure can provide a multi-tiered system to provide monitoring, detection, and/or initiation of protection protocols in response to detected faults in connection with the electronics associated with UAV systems, such as the motor drive and/or control systems that may drive the propulsion systems of the UAV.