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A driving control method for a constant air volume motor of a fan

A technology of motor drive control and constant air volume, applied in motor control, engine control, pump control, etc., can solve the problems of increased hardware cost, high dependence of position sensors, failure of position sensors, etc., to reduce equipment costs and have a wide range of applications. , the effect of reducing energy consumption

Active Publication Date: 2018-12-14
南京沃特电机有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods not only have a high dependence on the performance of the position sensor, but also increase the hardware cost, and also bring the risk of failure due to the failure of the position sensor.

Method used

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  • A driving control method for a constant air volume motor of a fan

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Mainly by monitoring the motor speed N x and other parameters to realize the driving control of the fan constant air volume motor, the control method includes the following steps:

[0025] (1) Determine the initial value Duty of the PWM duty cycle of the motor winding under the normal state of the air duct 0 , Air volume CFM at the air duct opening 0 , the current motor speed N 0 , where PWM is Pulse Width Modulation, the abbreviation of pulse width modulation.

[0026] (2) Keep the initial value Duty of the PWM duty cycle of the motor winding 0 The air duct opening is blocked in proportion; the initial cross-sectional area of ​​the air duct opening is S 0 , the effective cross-sectional area of ​​ventilation after blockage is S x , get different S x The air volume at the air outlet under the value CFM x , motor speed N x ; Take the blockage area ratio S of the air duct opening x / S 0 is the abscissa, and the air volume at the air outlet is CFM ...

Embodiment 2

[0030] Embodiment 2: Mainly by monitoring the motor current I x and other parameters to realize the driving control of the fan constant air volume motor, the control method includes the following steps:

[0031] (1) Determine the initial value Duty of the PWM duty cycle of the motor winding under the normal state of the air duct 0 , Air volume CFM at the air duct opening 0 , current motor current I 0 , where PWM is Pulse Width Modulation, the abbreviation of pulse width modulation.

[0032] (2) Keep the initial value Duty of the PWM duty cycle of the motor winding 0 The air duct opening is blocked in proportion; the initial cross-sectional area of ​​the air duct opening is S 0 , the effective cross-sectional area of ​​ventilation after blockage is S x , get different S x The air volume at the air outlet under the value CFM x , motor current I x; Take the blockage area ratio S of the air duct opening x / S 0 is the abscissa, and the air volume at the air outlet is CFM ...

Embodiment 3

[0037] Embodiment 3: Mainly by simultaneously monitoring the motor current I x and motor speed N x and other parameters to realize the driving control of the fan constant air volume motor, the control method includes the following steps:

[0038] (1) Determine the initial value Duty of the PWM duty cycle of the motor winding under the normal state of the air duct 0 , motor speed N 0 , motor current I 0 , Air volume CFM at the air duct opening 0 ; Wherein, PWM is Pulse Width Modulation, the abbreviation of pulse width modulation.

[0039] (2) Keep the initial value Duty of the PWM duty cycle of the motor winding 0 The air duct opening is blocked in proportion; the initial cross-sectional area of ​​the air duct opening is S 0 , the effective cross-sectional area of ​​ventilation after blockage is S x , get different S x The motor speed under the value N x , motor current I x , air volume at air outlet CFM x ; Take the blockage area ratio S of the air duct opening x / ...

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Abstract

The invention discloses a constant-air-volume motor drive control method for a fan. The constant-air-volume motor drive control method comprises the following steps: determining Duty 0, N0, I0 and CFM0, keeping Duty0 unchanged, and blocking the sectional area of an air flue opening; respectively obtaining Nx, Ix and CFMx under different Sx values while an initial sectional area is S0 and an effective ventilation sectional area is Sx; obtaining a stepless speed regulation datum reference curve; enabling the CFMX to be identically equal to CFM0 by regulating Dutyx, thereby obtaining current Nx, Ix and Dutyx; obtaining a constant-air-volume regulating datum curve; setting Dutyx as Duty0, and measuring Nx and Ix; according to the stepless speed regulation datum reference curve and the constant-air-volume regulating datum curve, correcting a duty ratio to be Dutyx, and enabling air volume CFMx of an air outlet to be identically equal to CFM0. In case of no sensor feedback, the control method realizes intelligent control of constant air volume of the fan, and improves the reliability of motor control.

Description

technical field [0001] The invention relates to a fan or a pump, in particular to a driving control method for a constant air volume motor of the fan. Background technique [0002] At present, in the fan application in the market, the speed of the fan is usually controlled to a certain constant speed to achieve the purpose of controlling the flow. Often have certain limitations. Moreover, the control power supply generally adopts the structure and logic control mode with Hall sensors to realize the control of the air volume of the fan. [0003] In order to achieve constant air volume control, some technical solutions set position sensors in the control system or use logic control methods to control the air volume of fans. These methods not only have a high dependence on the performance of the position sensor, but also increase the hardware cost, and also bring the risk of failure due to the failure of the position sensor. The constant air volume control method without pos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/00H02P29/00
CPCF04D27/004F05D2270/024F05D2270/304H02P29/00
Inventor 孙网生
Owner 南京沃特电机有限公司
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