The blower motor resistor is responsible for controlling the blower motor speed. In the past, this was done by varying the voltage supplied to the blower motor. In newer applications, the blower motor resistor is actually a solid state module that sends a varied signal to the blower motor.
What controls blower motor speed in a car?
Modern vehicles with automatic climate control feature variable speed blower motors which use a blower speed controller rather than the traditional 4 speed resistor. The driver inputs the required temperature settings via the HVAC control head which sends a digital signal to the blower motor speed controller.
What controls the blower motor speeds in a heater system?
But resistors, small electronic parts tucked out of sight, are what actually control the fan speed by reducing the amount of electrical current going to the blower motor.
How can you control the speed of a motor?
Thus, the speed of a DC motor can be controlled in three ways: By varying the supply voltage. By varying the flux, and by varying the current through the field winding. By varying the armature voltage, and by varying the armature resistance.
Does a blower motor resistor control the fan speed?
Blower resistors are resistors which are used to control the fan speed of automotive blowers. The fan speed can be changed either by switching the blower resistor resistance mechanically using a rotating lever, or electronically by the air conditioning system.
What controls blower motor speed in a car?
Modern vehicles with automatic climate control feature variable speed blower motors which use a blower speed controller rather than the traditional 4 speed resistor. The driver inputs the required temperature settings via the HVAC control head which sends a digital signal to the blower motor speed controller.
How does fan speed control work?
They control the voltage across the fan is controlled by a capacitor, the voltage across the fan determines the fan speed. Capacitive regulators are energy efficient with linear speed control, quiet operation without humming noises and highly reliable than electronic type regulator.
How do you slow down a blower motor?
You can increase or decrease the blower speed by slightly adjusting the pulley on the blower drive motor. To increase blower speed, slightly loosen the setscrew that holds the pulley to the driveshaft. Move or turn the pulley clockwise on the shaft one turn, then tighten setscrew.
How do I increase the blower speed on my furnace?
When increasing the blower speed, loosen the setscrew a little bit. This is the part that holds the pulley to the furnace's driveshaft. Turn the pulley one rotation clockwise on the shaft. If you want even more speed, do two rotations.
How can ECM motor speed be controlled?
If the terminals are present at the motor module (ECM X-13) you can switch speeds at the blower motor location. If you have a plug instead (ECM Broad Ocean) you can only make the adjustment at the control board or at the plug terminals at the end of the wiring. Make sure power is off when doing any adjustment.
What are 3 types of motor controls?
There are four basic motor controller and drive types: AC, DC, servo, and stepper, each having an input power type modified to the desired output function to match with an application.
Where is the blower motor control module?
It's located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor.
What does a blower motor regulator do?
The Blower Motor Regulator controls the speed of the blower motor in your vehicle's heating system. The regulator consists of a set of three resistors or terminals that generate a voltage to vary the speed of the motor. Each speed setting of the fan causes the current to flow through a combination of the resistors.
Will a blower motor work without the resistor?
Without any power, the motor won't run. As a result, the blower fan stays still and silent, and no air blows out of the vents. There are instances where a bad resistor will prevent the current from reaching the blower motor altogether.
Where is the blower motor control module?
It's located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor.
What does a blower motor regulator do?
The Blower Motor Regulator controls the speed of the blower motor in your vehicle's heating system. The regulator consists of a set of three resistors or terminals that generate a voltage to vary the speed of the motor. Each speed setting of the fan causes the current to flow through a combination of the resistors.
What controls blower motor speed in a car?
Modern vehicles with automatic climate control feature variable speed blower motors which use a blower speed controller rather than the traditional 4 speed resistor. The driver inputs the required temperature settings via the HVAC control head which sends a digital signal to the blower motor speed controller.
How do you control fan speed with a regulator?
In order to regulate the fan speed, a regulator is provided which varies the voltage across the winding and thus controls the speed. Lower the voltage lower the speed of the fan. So a regulator controls the voltage levels for the fan.
How do capacitors control fan speed?
The idea behind a capacitor regulator remains the same, which is to adjust the voltage across the motor of the fan. Now, when you increase the capacitance, the voltage across the capacitor decreases but that across the fan motor increases. Accordingly, the speed of the fan increases.
Does capacitor affect fan speed?
A higher value of capacitor does help in increasing the speed of the fan as a capacitor is basically used in a fan to create a phase difference between the currents taken by the main winding and the starting winding of single phase IM used in the fan.
What effect does slowing down the blower speed have on a heating unit?
In heating, higher speed = (usually)more flow/lower temperature; lower speed = less flow, higher temperature. Depending on your local conditions, it is possible that heating and a/c can utilize the same blower speed. Too low a speed will cause freezing (no good)in a/c.
What happens if blower speed is too high?
The blower motor running too high will cause it to overheat repeatedly, which incidentally overheats other systems within the furnace. The blower motor running too high will cause the system not to signal the defrost setting. This could cause issues with condensation within the system.
Do ECM blower motors have capacitors?
One of the characteristics of the ECM is that they do not require adding an external run or start capacitor. But a run capacitor may still be needed for the compressor. From the compressor the Start (S) and Run (R) leads are connected to the capacitor.
How is motor controlled?
The simplest electric motor controlling mechanism is a switch which connects/disconnects a motor to a power source. The switch may be operated manually or via a relay connected to a sensor which serves to automatically turn ON and OFF the motor.
What devices are used to control motors?
A motor controller is a device or set of devices that help in regulating the manner in which a motor works. There are two modes through which motor control components can start or stop the motor, either manual or automatic.
What is basic motor control?
Basic Motor Control The most basic type of AC motor control, for example, involves turning the motor on and off. This is often accomplished using a motor starter made up of a contactor and an overload relay. The contactor's contacts are closed to start the motor and opened to stop the motor.
What part controls the speed of the blower motor?
A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor. How the speed of the blower motor is controlled. See also:
How to control the speed of a fan motor?
If the fan has a DC motor, then the PWM technique is used as mentioned before. In case the fan has a AC motor (most probably) then you control the velocity of the motor by changing the frequency of the line. To change the frequency, you use a non linear device called "TRIAC". The method is normally known as "controlling the angle".
What is a blower motor resistor?
The motor that runs the fan in the heating and air conditioning system in a car is called a blower motor. It's located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor.
Why is my blower motor not working in my car?
In this car, in the highest "4" fan speed setting, the resistor is bypassed and the blower motor is powered directly by the fan switch. That's why in some cars, the blower motor may still work in the "High" speed setting if the resistor is bad.
Below you will find two interesting articles on a similar topic 👇
Where is the blower motor usually located?How do I test a blower motor relay?
