Constant-air-volume motor drive control method for 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 sensor, failure of position sensor, etc., to reduce equipment cost and wide application range , the effect of reducing energy consumption
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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 PulseWidthModulation, 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 x ...
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 PulseWidthModulation, 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 x...
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 PulseWidthModulation, 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 / S ...
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