Noise cancellation of a domestic appliance using a motor control
AssigneeHaier US Appliance Solutions, Inc.
InventorsPaul Goodjohn, Joseph Wilson Latham
Life of this patent
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Abstract
A method of operating a motor driving a rotating member includes directing rotation of the rotating member at the motor at an initial speed, determining a first frequency of a first noise component generated by the rotating member at the initial speed, determining a second noise component having a second frequency phase shifted 180° with respect to the first frequency, determining a torque modifier of the motor to generate the second noise component from the motor, and directing activation of the motor according to the determined torque modifier.
Claims18
A method of operating a motor driving a rotating member, the method comprising:
- directing rotation of the rotating member at the motor at an initial speed;
- determining a first frequency of a first noise component generated by the rotating member at the initial speed;
- determining a second noise component having a second frequency phase shifted 180° with respect to the first frequency;
- determining a torque modifier of the motor to generate the second noise component from the motor;
- and
- directing activation of the motor according to the determined torque modifier.
A motor assembly of a domestic appliance, the motor assembly comprising:
- a motor;
- a rotating member in mechanical communication with the motor and rotated thereby;
- a microphone for monitoring sound generated during operation of the domestic appliance;
- and
- a controller operably coupled to the microphone and the motor, the controller being configured to initiate a noise-responsive operation comprising
- directing rotation of the rotating member at the motor at an initial speed,
- determining a first frequency of a first noise component generated by the rotating member at the initial speed,
- determining a second noise component having a second frequency phase shifted 180° with respect to the first frequency,
- determining a torque modifier of the motor to generate the second noise component from the motor, and
- directing activation of the motor according to the determined torque modifier.
Dependencies are inferred from the claim text.