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 wind wheel and a motor, the motor comprising a motor controller, a stator component, and a rotor component, the method comprising the following steps:

• 1) inputting a target air volume Qref into the 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 torque T;
• 3) recording the rotational speed in the steady state, acquiring the adjustment coefficient V under the torque T through a table look-up method, and calculating an air volume Qc in the steady state according to a functional relation formula Q=F (T, n, V), Q representing the air volume, T representing a torque, n representing the rotational speed, V representing an adjustment coefficient, and each torque section having a corresponding adjustment coefficient;
• 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 torque, allowing the motor to work at the steady state and recording the rotational speed n when the target air volume Qref is equal or equivalent to the calculated air volume Qc;
• or b) increasing the torque T through the motor controller when the target air volume Qref is greater than the calculated air volume Qc, or c) decreasing the torque T 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 rotational speed after the motor falls on a new steady state under an increased or reduced torque, 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 torque until the calculated air volume Qc is equal or equivalent to the target air volume Qref, and recording the rotational speed n in the steady state after the motor falls on the steady state.