公开(公告)号：US10756653B2

公开(公告)日：2020-08-25

申请号：US13933473

申请日：2013-07-02

Applicant: Dyson Technology Limited

Inventor： Stephen Greetham ,  David John Hawker

IPC: H02K1/24 ,  B60L15/08 ,  H02P1/04 ,  H02P29/64 ,  H02P29/032 ,  H02P29/62 ,  H02P31/00

Abstract: A method of controlling a brushless motor that includes sensing a temperature and using the sensed temperature to define a current limit. A lower current limit is then defined for a lower sensed temperature. A winding of the motor is sequentially energized and de-energized, with the winding being de-energized when current in the winding exceeds the defined current limit.

公开(公告)号：US09801516B2

公开(公告)日：2017-10-31

申请号：US14304619

申请日：2014-06-13

Applicant: Dyson Technology Limited

Inventor： Libo Zheng ,  Yongji Zhou ,  James Douglas Chisholm ,  David John Hawker

IPC: A47L11/40 ,  A47L9/28

CPC classification number: A47L11/4011 ,  A47L9/2831 ,  A47L9/2847 ,  A47L9/2857 ,  A47L11/4008 ,  A47L11/4069

Abstract: A surface cleaning appliance having a cleaner head that includes an agitator and a motor for driving the agitator. The appliance includes a switch coupling the motor to a supply voltage, a voltage sensor for measuring the magnitude of the supply voltage, a current sensor for measuring the magnitude of current through the motor, and a controller configured to output a PWM signal for controlling the switch. The controller then adjusts the duty cycle of the PWM signal in response to changes in the supply voltage and in response to changes in the current through the motor.