Method for controlling air output volume

A method for controlling air volume provided by an air-conditioning fan system, the air-conditioning fan system comprising a blower wheel and a motor, the motor comprising a motor controller, a stator component, and a rotor component, and the method comprising:

• 1) inputting a target air volume Qref into a microprocessor control unit of the motor controller;
• 2) starting the motor by the motor controller and allowing the motor to work in a steady state under a rotational speed;
• 3) recording a torque T and a rotational speed n in the steady state, acquiring an adjustment coefficient V under the rotational speed n through a table look-up method, establishing a functional relation formula Q=F (T, n, V) for calculating the air volume, Q representing the air volume, T representing the torque, n representing a rotational speed, V representing an adjustment coefficient, and each rotational speed section having a corresponding adjustment coefficient, and calculating an air volume Qc in the steady state;
• 4) comparing the target air volume Qref with the calculated air volume Qc by the microprocessor control unit of the motor controller, and a) maintaining the rotational speed, allowing the motor to work in the steady state and recording the torque T when the target air volume Qref is equal or equivalent to the calculated air volume Qc;
• or b) increasing the rotational speed n through the motor controller when the target air volume Qref is greater than the calculated air volume Qc, or c) decreasing the rotational speed n through the microprocessor control unit of the motor controller when the target air volume Qref is smaller than the calculated air volume Qc;
• 5) re-recording a steady torque after the motor falls on a new steady state under an increased or reduced rotational speed, re-searching the corresponding adjustment coefficient V by the motor controller through the table look-up method, and recalculating the air volume Qc in the new steady state;
• and
• 6) repeating step 4) and step 5) to adjust the rotational speed until the calculated air volume Qc is equal or equivalent to the target air volume Qref, and recording the torque T in the steady state after the motor falls on the steady state.