System and methods for reducing noise in an air moving system

A centrifugal blower system comprising:

• a centrifugal blower assembly for generating airflow, said centrifugal blower assembly comprising at least one impeller, a motor configured to rotate said impeller and oriented to generate a first pressure wave to move through the airflow of the centrifugal blower system;
• and
• a motor controller configured to receive a first feedback parameter and transmit a first instruction based on the first feedback parameter, the first feedback parameter indicative of the first pressure wave,
• wherein said motor is configured to receive the first instruction and generate a second pressure wave that is out of phase with the first pressure wave to cancel the first pressure wave.

A method for reducing noise in a centrifugal blower system, the centrifugal blower system comprising a motor, at least one impeller coupled to the motor, the motor configured to rotate the impeller, and a motor controller coupled to the motor, the method comprising:

• receiving predefined operating parameters of the centrifugal blower system;
• executing a first characterizing routine using the motor controller, the first characterizing routine configured to operate the motor at multiple speeds to determine a first operating state of the centrifugal blower system based on the predefined operating parameters, the first operating state including a first motor speed;
• executing a second characterizing routine using the motor controller, the second characterizing routine configured to operate the motor at multiple speeds to determine a second operating state of the centrifugal blower system based on the predefined operating parameters, the second operating state including a second motor speed;
• storing the first operating state and the second operating state;
• transmitting an instruction to the motor;
• and
• moving the centrifugal blower system to either the first operating state or the second operating state in response to the instruction.