Method for controlling air output volume

Patent metadata

Field	Value
Publication number	US-9803881-B2
Application number	US-201514930624-A
Country	US
Kind code	B2
Filing date	Nov 2, 2015
Priority date	Apr 26, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A method for controlling air volume including: 1) inputting a target air volume into a microprocessor control unit of a motor controller; 2) starting a motor by the motor controller and allowing the motor to work in a steady state under a rotational speed; 3) recording the torque and rotational speed in the steady state, establishing a functional relation formula Q=F (T, n, V) for calculating the air volume, and calculating an air volume in the steady state; 4) comparing the target air volume with the calculated air volume; 5) re-recording a steady torque after the motor falls on a new steady state under an increased or reduced rotational speed, and recalculating the air volume in the new steady state; and 6) repeating steps 4) and 5) to adjust the rotational speed 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 provided by 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 allowing the motor to work in a steady state under a rotational speed;
3) recording a torque and a rotational speed n in the steady state, acquiring an adjustment coefficient V under the rotational speed n through a table look-up method, establishing a functional relation formula Q=F (T, n, V) for calculating the air volume, Q representing the air volume, T representing the torque, n representing the rotational speed, V representing the adjustment coefficient, and each rotational speed section having a corresponding adjustment coefficient, and calculating an air volume Qc in the steady state;
4) comparing the target air volume Q ref with the calculated air volume Qc by the microprocessor control unit of the motor controller, and a) maintaining the rotational speed, allowing the motor to work in the steady state and recording the torque T when the target air volume Q ref is equal or equivalent to the calculated air volume Qc, or b) increasing the rotational speed n through the motor controller when the target air volume Q ref is greater than the calculated air volume Qc, or c) decreasing the rotational speed n through the microprocessor control unit of the motor controller when the target air volume Q ref is smaller than the calculated air volume Qc;
5) re-recording a steady torque T after the motor falls on a new steady state under an increased or reduced rotational speed, 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 rotational speed until the calculated air volume Qc is equal or equivalent to the target air volume Qref, and recording the torque T in the steady state after the motor falls on the steady state.

2. The method of claim 1 , wherein when the torque and air output volume change due to the alteration of an external system, the motor controller compares the new steady torque with the torque in step 4) or step 6) to acquire the change of air output volume, and then steps 3), 4), 5), and 6) are repeated.

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

Q
=

c
⁢

⁢
0
×

n
×
V

n
base

+

c
⁢

⁢
1
×
T
×

n
base

n
×
V

,

⁢
or

Q
=

c
⁢

⁢
0
×

n
×
V

n
base

+

c
⁢

⁢
1
×
T
×

n
base

n
×
V

+

c
⁢

⁢
2
×

T
2

×

(

n
base

n
×
V

)

3

,

in which coefficients c 0 , c 1 , and c 2 are obtained by a curve fitting method under different external static pressures of base rotational speed n base according to the raw data of the torque and air volume parameters.

4. The method of claim 3 , wherein the base rotational speed n base ranges from 30% n max to 80% n max , and n max represents a maximum rotational speed of the motor.

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

6. The method of claim 3 , wherein a value of the adjustment coefficient V in the functional relation formula Q=F (T, n, V) ranges from 0.1 to 2.

7. The method of claim 1 , wherein that the calculated air volume Q c is equal or equivalent to the target air volume Q ref in step 4) and step 6) means that the calculated air volume Q c is in the 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%.

8. The method of claim 3 , wherein that the calculated air volume Q c is equal or equivalent to the target air volume Q ref in step 4) and step 6) means that the calculated air volume Q c is in the 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%.

9. The method of claim 1 , wherein increasing or decreasing the rotational speed n through the motor controller in step 4) means increasing or decreasing the rotational speed n according to step length sequence of at least 1% n max each time, or new rotational speed=current rotational speed×(target air volume Q ref /current calculated air volume Q c ).

10. The method of claim 3 ,

Assignees

• Zhongshan Broad Ocean Motor Co

Inventors

• Hu Ge
• Zhang Xiansheng

Classifications

• F04D27/004

  by varying driving speed · CPC title

• F24F11/75

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

• G05B19/041 Primary

  Function-oriented details · CPC title

• F24F11/0001

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

• G05B2219/2614

  HVAC, heating, ventillation, climate control · CPC title