For decreasing blower speed, loosen the setscrew that holds the pulley to the driveshaft. Move or turn the pulley counterclockwise on the driveshaft one turn, then tighten the setscrew. If less speed is desired, turn the pulley counterclockwise two turns.
Without getting too technical, you just change your driven pulley to one with a bigger or smaller diameter relative to your driver pulley. The bigger your driven pulley (vs the driver), the slower it will turn but the more torque it will produce.
The blower fan has three color-coded wires. One wire is for high speed, one is for medium and one is for low speed. Changing the fan speed involves disconnecting the speed wire and then connecting one of the other wires instead.
The pulley has a screw that, when twisted, changes the fan speed. Tightening this screw makes the fan rotate faster. Loosening it slows the rotations. The technician will refasten the pulley to its location via the attached screw set.
By varying the resistance, the slip of the motor is controlled, which directly affects the motor's speed. Increasing the rotor resistance increases the slip and decreases the RPM.
Mufflers (also known as silencers) are the most effective way to reduce your exhaust noise, and if a leak isn't to blame for high noise levels, then your muffler may be damaged or missing.
There are two hex set screws on the pulley. One secures the pulley to the shaft. The other allows the two halves of the pulley to be adjusted closer together or further apart. Be sure when adjusting to retighten the set screws on a flat side of the pulley base.
However, most systems use a single-speed fan. Even though the fan only ever runs at one speed, you can still adjust this speed to be faster or slower. Most blower fans have three different speed settings: high, medium and low.
The speed can be controlled two ways - controlling the voltage to the adjust lead or controlling the resistance between the adjust lead and the return. Either pulse width modulation or a variable voltage/resistance can accomplish either method.
The speed can be varied by varying the resistance by turning the knob (Usually by steps). This will cause some voltage variation across the resistor and the fan will rotate at a different speed.
By varying the armature voltage and resistance simultaneously, the speed of a DC motor can be effectively controlled. Decreasing the armature voltage and increasing the armature resistance contribute to reducing the motor speed. This method is suitable for applications where precise speed control is required.
Using multiple pulleys decreases the amount of force necessary to move an object by increasing the amount of rope used to raise the object. The mechanical advantage (MA) of a pulley system is equal to the number of ropes supporting the movable load.
Pulley systems provide an ideal environment for using the formulas s = rθ and v = rω .
If the speed is set to high or too low, the air volume will also be too high or too low for the system to function properly. Setting the fan speed too low will usually cause the evaporator coil to freeze. If the fan speed is too high, it can cause the AC condenser to short-cycle or turn on and off constantly.
In some instances, lower fan speeds will improve both temperature and humidity control, limit air pressure in the HVAC air ducts, and dramatically reduce overall system wear. However, it's important to note that fan speed adjustments should always be performed by licensed professionals.
Navigate to the "Hardware Monitor" or "Fan Control" section of the BIOS. The location of this is based on your motherboard and BIOS version. If you can't find it, we recommend searching online for instructions specific to your system. Look for an option that says "CPU Fan Speed Control" or something similar.
By changing the diameter of the pulley wheels, speed can be changed. A smaller pulley turning a larger pulley results in the larger one moving more slowly but with more shaft power.
Smaller driver pulley on motor equals less revolutions to the fan pulley, increase the size of the motor pulley and you increase the revolutions going to the fan pulley. If you make the fan pulley smaller it too will make the fan go faster.
The larger the pulley on the motor, the slower the blower fan turns.
Getting a muffler or a resonator can help minimize a vehicle's noise.
The purpose of an exhaust silencer is to reduce engine noise emission. An engine without a silencer will create an unbearable amount of exhaust noise in our environment. Noise is defined as unwanted sound. Sound is a pressure wave formed from pulses of alternating high and low pressure air.
Rather than resort to stopgap measures, the best approach may be to simply install a better muffler that is both quiet and powerful.