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AC Fan Motors: What They Are and How They Work

Views: 0     Author: Site Editor     Publish Time: 2023-08-27      Origin: Site

When it comes to air conditioning, AC fan motors are an essential component that helps to keep your home or office cool and comfortable. These motors work by spinning a fan that draws in air and passes it over the evaporator coil, which cools the air before it is blown back into the room. In this article, we will explore what AC fan motors are, how they work, and some common FAQs related to them.

AC fan motors are a crucial part of any air conditioning system, and without them, your AC would not be able to function. These motors are responsible for circulating air over the evaporator coil, which is where the heat exchange process takes place. They work in tandem with other components of an AC system, such as the compressor and condenser, to cool the air in your home or office.

What Are AC Fan Motors?

AC fan motors are electric motors that are designed to spin a fan blade, which moves air through an air conditioning system. These motors are typically found in both residential and commercial air conditioning units, and they come in a variety of shapes and sizes depending on the size of the unit they are powering.

How Do AC Fan Motors Work?

When an AC unit is turned on, the AC fan motor will spin the fan blades, which will draw air into the unit. The air will then pass over the evaporator coil, where it will be cooled before being blown back into the room. The AC fan motor works in tandem with the compressor and condenser to create a closed-loop system that continuously circulates and cools the air.

Types of AC Fan Motors

There are two main types of AC fan motors: shaded pole motors and permanent split capacitor (PSC) motors.

Shaded Pole Motors

Shaded pole motors are the most common type of AC fan motor. They are simple in design and consist of a single coil that is wrapped around a portion of the motor's core. When an electric current is passed through the coil, it creates a magnetic field that causes the rotor to spin. The main advantage of shaded pole motors is their low cost and simple design.

Permanent Split Capacitor (PSC) Motors

PSC motors are more efficient than shaded pole motors and are often found in larger AC units. They consist of a capacitor that provides an additional current phase, which helps the motor to start and run more efficiently. PSC motors are more expensive than shaded pole motors but are more efficient and longer-lasting.

Factors That Affect AC Fan Motor Performance

There are several factors that can affect the performance of an AC fan motor, including:

  • Age: Over time, AC fan motors can wear out, causing them to perform less efficiently or stop working altogether.

  • Dirt and debris: Dust and debris can accumulate on the motor and fan blades, reducing airflow and causing the motor to work harder than it needs to.

  • Electrical issues: Faulty wiring or electrical components can cause the motor to malfunction or stop working altogether.

  • Overuse: If an AC unit is used excessively, the motor may wear out more quickly than normal.

FAQs About AC Fan Motors

What is the typical lifespan of an AC fan motor?

  • AC fan motors typically last between 10-15 years, depending on usage and maintenance.

How do I know if my AC fan motor is failing?

  • Signs that your AC fan motor may be failing include strange noises, reduced airflow, and an increase in your energy bill.

Can I replace an AC fan motor myself?

  • While it is possible to replace an AC fan motor yourself, it is generally recommended that you hire a professional to ensure that the replacement is done safely and correctly. A professional will also be able to diagnose any other issues that may be affecting your AC system.

Can I lubricate my AC fan motor to improve its performance?

  • No, AC fan motors are sealed and do not require lubrication. Attempting to lubricate the motor can actually cause damage.

How often should I have my AC fan motor serviced?

  • It is recommended to have your AC system serviced annually, which includes inspecting and cleaning the fan motor and blades.

What should I do if my AC fan motor stops working?

  • If your AC fan motor stops working, it is best to call a professional to diagnose and repair the issue. Attempting to fix it yourself can be dangerous and may cause further damage to your AC system.


AC fan motors are a critical component of any air conditioning system, and without them, your AC would not be able to function. Understanding what they are and how they work can help you maintain and troubleshoot issues with your AC system. If you suspect that your AC fan motor is not working correctly, it is best to call a professional to diagnose and repair the issue.

AC fan motors are not something that many people think about, but they play a vital role in keeping our homes and offices cool and comfortable. By taking care of your AC system and having it serviced regularly, you can help ensure that your AC fan motor continues to work efficiently and keep you cool for years to come.