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US 2011/0254482 A1Published application
Control of a brushless motor
AssigneeDyson Technology Limited
InventorHanping Dai
Life of this patent
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Abstract
A method of controlling a brushless motor that includes exciting a winding of the motor with a voltage, and freewheeling the winding when current in the winding exceeds a threshold or after the winding has been excited for a timeout period. The timeout period is adjusted in response to a change in one of the voltage and the motor speed. Additionally, a control system that implements the method, and a motor system that incorporates the control system.
Claims13
A method of controlling a brushless motor, the method comprising:
- exciting a winding of the motor with a voltage;
- freewheeling the winding in response to one of current in the winding exceeding a threshold and the winding being excited for a timeout period;
- and
- adjusting the timeout period in response to a change in one of the voltage and motor speed.
1 more element
Dependencies are inferred from the claim text.