Centrifugal fan, the same motor, for big leaf wheel, will not reduce the speed, while reducing noise, but the air volume will increase, the wind pressure decreases
The motor speed is generally fixed, unless it is a frequency conversion type adjustable speed motor or special can artificially change the speed, otherwise, the speed is constant, since the speed is constant, so, in the big wheel (before you replace the impeller compared to the no change) after
The motor will consume more energy to do the work, and the air flow will be greater. The noise and wind pressure will depend on the shape of the big wheel.
For large diameter impeller same structure, because the motor does not change, is not the motor load increased -- yes, is the shaft power will rise, but because the power output of the motor is fixed, if continuous operation will cause motor overheating, then trip (if there is, if there is no protection) protection device will burn the motor;Motor speed is constant (without speed regulation); wind pressure is proportional to speed; the greater the wind pressure, the higher the speed required; this is because there is a need for sufficient line speed to achieve a certain wind pressure;
