Method for controlling air output volume

Patent metadata

Field	Value
Publication number	US-10184680-B2
Application number	US-201514970582-A
Country	US
Kind code	B2
Filing date	Dec 16, 2015
Priority date	Apr 26, 2012
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

A method for controlling air volume including: inputting a target air volume into the microprocessor control unit of the motor controller; starting a motor by the motor controller under a torque to enable the motor to work in a steady state; recording the rotational speed in the steady state, and establishing a functional relation formula Q=F (T, n, V) to calculate an air volume in the steady state; comparing the target air volume with the calculated air volume; re-recording a steady rotational speed after the motor falls on a new steady state under an increased or reduced torque, and recalculating the air volume in the new steady state; and repeatedly adjusting 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 a motor, the method comprising:
1) inputting a target air volume Q ref into a microprocessor control unit of a motor controller;
2) starting the motor by the motor controller, and presetting a torque T;
2a) allowing the motor to work in a steady state under the torque T;

3) determining an air volume Q c generated by the motor by detecting and recording a rotational speed in the steady state: acquiring an adjustment coefficient V under the torque T through a table look-up method, and establishing a functional relation formula Q=F (T, n, V) to calculate the air volume Q c in the steady state, Q representing the air volume, T representing the torque, n representing the rotational speed, V representing the adjustment coefficient, and each torque section having a corresponding adjustment coefficient;
4) adjusting the torque T after comparing the target air volume Q ref with the air volume Q c by the microprocessor control unit of the motor controller: a) increasing the torque T through the motor controller when the target air volume Q ref is greater than the air volume Q c , or b) decreasing the torque T through the microprocessor control unit of the motor controller when the target air volume Q ref is smaller than the air volume Q c ; and
5) repeating 2a), 3), and 4) until the air volume Q c is equal or equivalent to the target air volume Q ref , maintaining the torque, allowing the motor to work at the steady state, and recording the rotational speed n in the steady state after the motor falls on the steady state.

2. The method of claim 1 , wherein the functional relation formula Q=F (T, n, V) is as follows:

Q
=

c
⁢

⁢
0
×

T
×
V

T
base

+

c
⁢

⁢
1
×
n

,

⁢
or

Q
=

c
⁢

⁢
0
×

T
×
V

T
base

+

c
⁢

⁢
1
×
n

+

c
⁢

⁢
2
×

n
2

×

T
base

T
×
V

,

in which coefficients c0, c1, and c2 are obtained by a curve fitting method under different external static pressures conditions of a base torque T base according to raw data of the rotational speed and air volume parameters.

3. The method of claim 2 , wherein the base torque T base ranges from 30% T 0 to 80% T 0 , and T 0 represents a rated torque of the motor.

4. The method of claim 2 , wherein a value of the adjustment coefficient V in the functional relation formula Q=F (T, n, V) ranges from 0.1 to 2.

5. The method of claim 2 , wherein that the calculated air volume Q c is equal or equivalent to the target air volume Q ref in 5) means that the calculated air volume Q c is in a range of “target air volume Q ref ±error window”, and the error window of the target air volume Q ref ranges from 1% to 2%.

6. The method of claim 2 , wherein increasing or decreasing the torque T through the motor controller in 4) means increasing or decreasing an instant torque T according to step length sequence of at least 1% T 0 each time, or new torque=current torque×(target air volume Q ref /current calculated air volume Q c ) 2 .

7. The method of claim 2 , wherein the functional relation formula Q=F (T, n, V) is acquired as follows according to raw data of rotational speed and air volume parameters under a base torque T base and other torques and under different external static pressures:
a) arranging the motor fixed on a wind wheel in an air-conditioning device;
b) allowing the motor to work at a working state of constant torque;
c) selecting a plurality of torque values comprising the base torque within the range without exceeding a rated torque;
d) allowing the motor to work under different torques; and
e) changing the external static pressure of the system in sequence to collect the raw data comprising the rotational speed and the air volume parameters.

8. The method of claim 1 , wherein a value of the adjustment coefficient V in the functional relation formula Q=F (T, n, V) ranges from 0.1 to 2.

9. The method of claim 1 , wherein that the air volume Q c is equal or equivalent to the target air volume Q ref in 5) means that the calculated air volume Q c is in a range of “target air volume Q ref ±error window”, and the error window of the target air volume Q ref ranges from 1% to 2%.

10. The method of claim 1 , wherein increasing or decreasing the torque T through the motor controller in 4) means increasing or decreasing an instant torque T according to step length sequence of at least 1% T 0 each time, or new torque=current torque×(target air volume Q ref /current calculated air volume Q c ) 2 .

11. The method of claim 1 , wherein the functional relation formula Q=F (T, n, V) is acquired as follows according to raw data of rotational speed and air volume parameters under a base torque T base and other torques and under different external static pressures:
a) arranging the motor fixed on a wind wheel in an air-conditioning device;
b) allowing the motor to work at a working state of constant torque;
c) selecting a plurality of torque values comprising

Assignees

• Zhongshan Broad Ocean Motor Co

Inventors

• Hu Ge
• Zhang Xiansheng

Classifications

• F24F11/77

  by controlling the speed of ventilators · CPC title

• F04D15/0066

  by changing the speed, e.g. of the driving engine · CPC title

• F24F11/0001

  for ventilation (F24F11/30 takes precedence) · CPC title

• F04D15/0094 Primary

  Indicators of rotational movement · CPC title

• F04D27/004 Primary

  by varying driving speed · CPC title