Back to results
US 2011/0254489 A1Published application
Control of a brushless motor
AssigneeDyson Technology Limited
InventorStephen GREETHAM
Life of this patent
Estimating the term…
Abstract
A method of controlling a brushless motor that includes exciting a winding of the motor until current in the winding exceeds a threshold, and then continuing to excite the winding for an overrun period. The length of the overrun period is adjusted in response to a change in one of time, motor speed and excitation voltage. Additionally, a control system that implements the method, and a motor system that incorporates the control system.
Claims25
A method of controlling a brushless motor, the method comprising:
- exciting a winding of the motor until current in the winding exceeds a threshold;
- continuing to excite the winding for an overrun period;
- and
- adjusting the length of the overrun period in response to a change in one of time, motor speed and excitation voltage.
1 more element
Dependencies are inferred from the claim text.