公开(公告)号：US20210265926A1

公开(公告)日：2021-08-26

申请号：US17260867

申请日：2019-05-17

Applicant: Dyson Technology Limited

Inventor： Jack Michael THOMPSON ,  Samuel Wesley HINCHLIFFE

IPC: H02P6/15

Abstract: A method of controlling a brushless permanent magnet motor includes measuring a mains power supply voltage of the motor. The method includes determining whether the mains power supply voltage lies within a first range representative of a first country's mains power supply or a second range representative of a second country's mains power supply. The method includes advancing commutation of a winding of the motor relative to a zero-crossing of back EMF in the winding where the mains power supply voltage lies within the first range, and retarding commutation of the winding relative to a zero-crossing of back EMF in the winding where the mains power supply voltage lies within the second range.

公开(公告)号：US20240237800A1

公开(公告)日：2024-07-18

申请号：US18288671

申请日：2022-04-19

Applicant: Dyson Technology Limited

Inventor： Yuen Kee LEOW ,  Weifu YU ,  Clement Jian Ming TAN ,  Xinyi LI ,  Gaudencio III Racho TEVES ,  Stephen John WOOLAGHAN ,  Kishan Mayur AMRATIA ,  Jack Michael THOMPSON ,  Brian William WEEKS ,  Teng Lee KHOO

IPC: A45D20/12

CPC classification number: A45D20/12

Abstract: A haircare appliance includes a pressure sensor for generating a pressure signal indicative of air pressure within an airflow path, the pressure sensor being upstream of an airflow generator. A controller is configured to estimate, based at least partly on the pressure signal, a blockage factor corresponding to an amount by which the airflow path is blocked. When the estimated blockage factor exceeds a blockage warning threshold, a warning indicative of a partial blockage is output. When the estimated blockage factor exceeds a critical threshold, the critical threshold being higher than the blockage warning threshold, a power output of at least one component of the haircare appliance is turned off or reduced.