公开(公告)号：US20230024733A1

公开(公告)日：2023-01-26

申请号：US17790342

申请日：2020-11-16

Applicant: Dyson Technology Limited

Inventor： Michele BENETTI ,  Nikita SHMIDT

IPC: A61B5/00 ,  A61C17/28 ,  A46B15/00

Abstract: A dental treatment appliance transmits a pulsed light signal towards the oral cavity and captures images of the oral cavity from light returned from the oral cavity. A controller actuates the treatment of the oral cavity of the user depending on the captured images.

公开(公告)号：US20220352834A1

公开(公告)日：2022-11-03

申请号：US17598174

申请日：2020-03-19

Applicant: Dyson Technology Limited

Inventor： Nikita SHMIDT

IPC: H02P6/182

Abstract: A method of determining a position of a rotor of a brushless permanent magnet motor includes measuring phase current flowing through a phase winding of the motor during excitation of the phase winding, and measuring voltage applied to the phase winding of the motor during excitation of the phase winding. The method includes calculating a phase of back EMF induced in the phase winding using the measured phase current and the measured voltage. The method includes determining a zero-crossing point of the back EMF induced in the phase winding using the calculated phase of back EMF induced in the phase winding. The method includes determining an aligned position of the rotor of the brushless permanent magnet motor when the back EMF induced in the phase winding is at the zero-crossing point.