| 主权项 |
1. A method for controlling air volume output by a motor, the method comprising:
1) determining a low torque interval 0-Tm and a high torque interval Tm-T0 within a range from 0 to a rated torque T0; testing relationships between an air volume and a rotational speed of a motor system under multiple constant torques within the low torque interval and the high torque interval, respectively; establishing a functional relation formula Q1=F1 (T, n, V) for calculating the air volume within the low torque interval; and establishing a functional relation formula Q2=F2 (T, n, V) for calculating the air volume within the high torque interval; 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 which is input into a microprocessor control unit of a motor controller; 2) inputting a target air volume Qref into the microprocessor control unit of the motor controller; 3) starting the motor by the motor controller under the torque T to enable the motor to reach a steady state, and recording the rotational speed n in the steady state; 4) acquiring the adjustment coefficient V under the torque T through a table look-up method; determining whether the torque T is within the low torque interval or within the high torque interval; calculating an air volume Qc according to the functional relation formula Q1=F1 (T, n, V) if the torque T is within the low torque interval; and calculating the air volume Qc according to the functional relation formula Q2=F2 (T, n, V) if the torque T is within the high torque interval; 5) 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 to work at the steady state and recording the rotational speed n if 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 if 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 if the target air volume Qref is smaller than the calculated air volume Qc; 6) re-recording a steady rotational speed after the motor reaches a new steady state under an increased or reduced torque; re-searching the corresponding adjustment coefficient V through the table look-up method; determining whether the torque in the steady state is within the low torque interval or within the high torque interval; and recalculating the air volume Qc according to the corresponding functional relation formula; and 7) repeating step 5) and step 6) 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 reaches the steady state. |
