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How Does A Blower Motor Work?

It is important that you understand what blower motors are and how they work before learning how to clean and maintain them.

A blower motor circulates air into a building as part of an HVAC system. This is essential for maintaining a comfortable temperature and humidity throughout your facility. During the summer, blowers push cold air through ducts, while in the winter, they push hot air through ducts. The HVAC system in your structure likely has multiple blowers that need to be maintained if it has air registers.

Blower Motors – How Do They Work?

One type of Blower motor Powerstroke is the single-speed motor, and the other type is the electronically communicated motor (ECM), which is also called variable-speed motors. Most older furnaces have a single-speed blower that only runs at two speeds: 100% or 0%. There are only two options, on or off, just like a regular light switch.

On the other hand, a variable-speed blower runs continuously at a lower output and uses less electricity. Its speed and air volume can be adjusted to meet the heating and cooling requirements of the facility. Because it can adjust speed according to demand, it is similar to the gas pedal of a car. Blowers monitor data constantly and can adjust air speed to compensate for blocked vents or dirty filters.

How Is A Blower Motor Composed?

In order to provide an overview of the parts of a blower motor, we will explain how they work:

  • Motor – The blower’s main power source. The motor drives the shaft. The fan moves with the motor.
  • Belt – A belt connects the motor shaft to the fan, which is connected directly to the belt. When the motor turns the shaft, the fan moves accordingly. The fan is not always driven by a belt. The motor shaft directly spins the fan blades without a belt in direct drive fans.
  • Shaft – There is a shaft attached to the impeller. It transfers energy from the motor to the impeller using its torque.
  • Housing – A blower that lacks a housing is more likely to be damaged by dirt, grime, oil, and moisture that leaks into its wires.
  • Bearings – To keep the impeller spinning, bearings reduce friction between the rotating shaft and the motor.
  • Capacitor – The motor runs and/or starts more efficiently with capacitors, as they give it more starting torque and improve its efficiency. It won’t start without torque to turn the blower wheel or fan belt.

Cleaning And Maintenance Of Blower Motors

Routine blower motor cleaning and maintenance increases equipment life and reduces operating costs, downtime costs, and troubleshooting costs. Since the issues are caught ahead of time, the majority of these expenses are mitigated.

Maintenance Program For Blower Motors

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There are three types of blower maintenance programs: regular, quarterly, and annual. Maintenance is the process of setting a schedule to inspect components that are considered to be leading indicators of potential failure.

Routinely Monitoring Blower Motors Is A Good Practice.

Condition of bearings and lubricants

Monitor and log bearing temperatures, lubricant levels, and vibrations. Lubricants should be clear and not bubbly. A bubbling bearing is a good indication that more lubricant needs to be added to decrease the temperature. Increasing vibration can be an indication that a bearing is about to fail.

Shaft Seal Condition

Make sure the mechanical seals are intact. A visible leak should not be present.

Make sure the pump’s packing is adequately lubricated during downtime. Replacing the packing and adding lubricant according to the operation manual should be done if it looks compressed and dry.

Replace Filters

This simple solution prevents downtime caused by dirty fan blades, motors, coils, and heat exchangers.

Air Flow

Make sure all return air registers are open and free of obstructions. A lack of air flow will cause a motor to shut down and decrease its efficiency.

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