Method for controlling air volume

Patent metadata

Field	Value
Publication number	US-9347453-B2
Application number	US-201313845139-A
Country	US
Kind code	B2
Filing date	Mar 18, 2013
Priority date	Nov 13, 2012
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

A method for controlling air volume output by a motor. The method includes: 1) establishing functional relation formulas for air volume in a low torque interval and a high torque interval; 2) inputting a target air volume into a microprocessor control unit; 3) starting a motor under a torque to enable the motor to reach a steady state; 4) acquiring an adjustment coefficient under the torque, and calculating the air volume; 5) comparing the target air volume with the calculated air volume; 6) re-recording a steady rotational speed after the motor reaches a new steady state under an increased or reduced torque, and recalculating the air volume in the new steady state; and 7) repeating steps 5) and 6) to adjust the torque until the calculated air volume is equal or equivalent to the target air volume.

First claim

The invention claimed is:

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 ref 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 Q c 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 Q c 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 Q ref with the calculated air volume Q c 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 Q ref is equal or equivalent to the calculated air volume Q c ; or b) increasing the torque T through the motor controller if the target air volume Q ref is greater than the calculated air volume Q c , or c) decreasing the torque T through the microprocessor control unit of the motor controller if the target air volume Q ref is smaller than the calculated air volume Q c ;
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 c according to the corresponding functional relation formula; and
7) repeating step 5) and step 6) to adjust the torque until the calculated air volume Q c is equal or equivalent to the target air volume Q ref , and recording the rotational speed n in the steady state after the motor reaches the steady state.

2. The method of claim 1 , wherein step 7) is followed by step 8): if the rotational speed and the output air volume change due to the alteration of an external system, the motor controller compares the new steady rotational speed with the rotational speed in step 5) or step 7) to acquire the change of output air volume, and then steps 4), 5), 6), and 7) are repeated.

3. The method of claim 1 , wherein
step 7) is followed by step 9) for recording an abnormal individual air volume: carrying out a practical testing and calibration, if under working conditions of a target air volume and a static pressure p, an actual air volume Q m is greatly different from the target air volume, setting an abnormal point; setting the target air volume as an abnormal target air volume Q t ; recording a torque T1 and a rotational speed n1 in a steady state; manually correcting the target air volume recorded in a program until the actual air volume Q m is equivalent to the abnormal target air volume Q; recording a manually corrected compensation target air volume Q p , a torque T2, a rotational speed n2 in a new steady state; acquiring an array {Q t , n1, Q p , n2} at each abnormal point, and storing the array corresponding to each abnormal point in the microprocessor control unit of the motor controller; and
step 3) is followed by step 10) for individual air volume correction: the microprocessor control unit of the motor controller making a judgment through the table look-up method; adjusting the target air volume Q ref if the target air volume Q ref =the abnormal target air volume Q t , the rotational speed n=the rotational speed n1, and the motor has not yet entered a flow of normally adjusting the air volume; using the manually corrected compensation target air volume Q p , as a new target air volume; and repeating steps 4), 5), 6), and 7); the rotational speed in the steady state recorded in the step 7) at the moment is the rotational speed n2 mentioned in step 9); exiting the individual air volume correction if in the real-time control, the conditions of “the target air volume Q ref =the abnormal target air volume Q t , and the rotational speed n=the rotational speed n1” are not met because the status of a temperature controller is corrected by a user, or the rotational speed n is not equal to the rotation speed n2; restoring an original input target air volume Q ref ; and repeating steps 4), 5), 6), and 7).

4. The method of claim 2 , wherein
step 7) is followed by step 9) for recording an abnormal individual air volume: carrying out a practical testing and calibration, if under working conditions of a target air volume and a static pressure p, an actual air volume Q m is greatly different from the target air volume, setting an abnormal point; setting the target air volume as an abnormal target air volume Q t ; recording a torque T1 and a rotational speed n1 in a steady state; manually correcting the target air volume recorded in a program until the actual air volume Q m is equivalent to the abnormal target air volume Q; recording a manually corrected compensation target air volume Q p , a torque T2, a rotational speed n2 in a new steady state; acquiring an array {Q t , n1, Q p , n2} at each abnormal point, and storing the array corresponding to each abnormal point in the microprocessor control unit of the motor controller; and
step 3) is followed by step 10) for individual air volume correction: the microprocessor control unit of the motor controller making a judgment through the table look-up method; adjusting the target air volume Q ref if the target air volume Q ref =the abnormal target air volume Q t , the rotational speed n=the rotational speed n1, and the motor has not yet entered a flow of normally adjusting the air volume; using the manually corrected compensation target air volume Q p , as a new target air volume; and repeating steps 4), 5), 6), and 7); the rotational speed in the steady state recorded in the step 7) at the moment is the rotational speed n2 mentioned in step 9); exiting the individual air volume correction if in the real-time control, the conditions of “the target air volume Q ref =the abnormal target air volume Q t , and the rotational speed n=the rotational speed n1” are not met because the status of a temperature controller is corrected by a user, or the rotational speed n is not equal to the rotation speed n2; restoring an original input target air volume Q ref ; and repeating steps 4), 5), 6), and 7).

5. The method of claim 1 , wherein a calculation formula for calculating air volume is as follows:

Q
⁢

⁢
1

Assignees

• Zhongshan Broad Ocean Motor Co

Inventors

• Hu Ge

Classifications

• F04D27/004 Primary

  by varying driving speed · CPC title

• F24F11/77

  by controlling the speed of ventilators · CPC title

• F24F11/75

  for maintaining constant air flow rate or air velocity · CPC title

• Y02B30/70

  Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating · CPC title

• F24F11/0079

  Mechanical Engineering · mapped topic