Patent ID: 9347453
Filing Date: 2016-05-24
CPC Classification: F04D,F24F,Y02B

Claim Text:
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 Q 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 Q 5) comparing the target air volume Q 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 Q 7) repeating step 5) and step 6) to adjust the torque until the calculated air volume Q