Method for controlling air output volume

• US 10,184,680 B2
• Filed: 12/16/2015
• Issued: 01/22/2019
• Est. Priority Date: 04/26/2012
• Status: Active Grant

• Current Assignee: Zhongshan Broad-Ocean Motor Company Limited
• Original Assignee: Zhongshan Broad-Ocean Motor Company Limited
• Inventors: Hu, Ge, Zhang, Xiansheng
• Primary Examiner(s): Yi, Changhyun
• Application Number:
  US14/970,582
• Publication Number:
  US 20160097558A1
• Time in Patent Office: 1,133 Days
• CPC Class Codes: F04D 15/0066 by changing the speed, e.g. of the driving engine
• CPC Class Codes: F04D 15/0094 Indicators of rotational movement
• CPC Class Codes: F04D 27/004 by varying driving speed
• CPC Class Codes: F04D 27/007 Conjoint control of two or more different functions
• CPC Class Codes: F24F 11/0001 for ventilation F24F11/30 takes precedence
• CPC Class Codes: F24F 11/75 for maintaining constant air flow rate or air velocity
• CPC Class Codes: F24F 11/77 by controlling the speed of ventilators
• CPC Class Codes: G05B 19/416 characterised by control of velocity, acceleration or deceleration G05B19/19 takes precedence
• CPC Class Codes: G05B 2219/37371 Flow
• CPC Class Codes: Y02B 30/70 Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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.

Claims

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:

3. The method of claim 2, wherein the base torque T_base ranges from 30% T₀ to 80% T₀, and T₀ 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% T₀ 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% T₀ 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 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.

12. A method for controlling an air-conditioning fan system, the air-conditioning fan system comprising a wind wheel and a motor, the motor comprising a motor controller, a stator component, and a rotor component, the method comprising:

1) inputting a target air volume Q_ref into a microprocessor control unit of the 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 air-conditioning fan system 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 calculating the air volume Q_c in the steady state according to a functional relation formula Q=F (T, n, V), 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;

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, and recording the rotational speed n in the steady state after the motor falls on the steady state.

13. The method of claim 12, wherein the functional relation formula Q=F (T, n, V) is as follows:

14. The method of claim 13, wherein the base torque T_base ranges from 30% T₀ to 80% T₀, and T₀ represents a rated torque of the motor.

15. The method of claim 13, wherein a value of the adjustment coefficient V in the functional relation formula Q=F (T, n, V) ranges from 0.1 to 2.

16. The method of claim 13, 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%.

17. The method of claim 13, 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% T₀ each time, or new torque=current torque×

(target air volume Q_ref/current calculated air volume Q_c)².

18. The method of claim 12, wherein a value of the adjustment coefficient V in the functional relation formula Q=F (T, n, V) ranges from 0.1 to 2.

19. The method of claim 12, 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%.

20. The method of claim 12, 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% T₀ each time, or new torque=current torque×

(target air volume Q_ref/current calculated air volume Q_c)².