Dyson Technology Limited

Mark Edward Leaver

Yu Chen

Tuncay Celik

Hanping Dai

Samuel Wesley Hinchliffe

A method of controlling a brushless motor that includes storing a lookup table of control values, periodically obtaining a speed-adjusted control value, and exciting a phase winding of the motor. The speed-adjusted control value is then used to define the phase and/or length of excitation. Obtaining the speed-adjusted control value includes measuring the speed of the motor, increasing or decreasing a speed-adjust variable in the event that the measured speed is greater or less than a threshold, selecting a control value from the lookup table using the measured speed, and adjusting the selected control value using the speed-adjust variable to obtain the speed-adjusted control value. Additionally, a control system that implements the method, and a motor assembly that incorporates the brushless motor and the control system.

Method of controlling a brushless motor

A method of controlling an electrical machine that includes exciting a phase winding with a supply voltage, and freewheeling the phase winding when current in the phase winding exceeds a threshold. The threshold is then adjusted in response to changes in the supply voltage and/or the speed of the electrical machine. Additionally, a control system that implements the method and an electrical machine comprising the control system are described.

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Malmesbury, United Kingdom

Mark Edward Leaver