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Whether you have a budget model or a top-tier air conditioner with the latest technology, you’ll find there are multiple types of AC motors inside the unit that create operational efficiency. These separate motors use electrical energy to propel cool air into your home. In addition, a wide range of HVAC motors affects the energy consumption of the air conditioner system. If you want to explore what type of motor is used in an air conditioner, read on.
You should contact a qualified HVAC professional if you suspect a faulty compressor motor.
If you know what an air exchanger is in air conditioning, you understand how critical electric motors are for an energy-efficient system. For a basic breakdown, an air conditioner’s motor is composed of a stator and rotor. A stator remains stationary while the electrical rotor rotates inside the stator. The rotation induces an electric current and thus a magnetic field. With the rotor being attached to the motor shaft, the shaft then rotates as well to power the machine. Keep in mind that motors can also be a source of multiple issues. For example, if you have a hissing AC unit or hear a knocking sound in the air conditioner, the AC motors might be a factor. If you’re repairing the unit at home, you should also learn the kinds of oil for an air conditioner.
This motor type is considered a star player in the HVAC industry due to the high starting torque. Two common types of split-phase motors are capacitor-start-induction-run and resistance-start-induction-run electric motors.
Capacitor-start electric motors use a start capacitor to enhance the starting torque. Most of these units disconnect the start capacitor from the start winding circuit when the motor reaches 70 to 80 percent speed using a centrifugal switch.
A resistance-start electric motor uses a start winding and a run winding that are out of phase by 45 to 90 degrees to boost the startup. This motor uses a centrifugal switch to drop the start winding from the electric circuit.
Permanent split capacitor (PSC) electric motors are used for various applications like refrigeration and air conditioning compressors. This motor type has high operational efficiency for air conditioning compressor applications, thanks to the separated start and run capacitors. In addition, this electric motor is single-phase and can work in a clockwise or counter-clockwise direction.
Never work on an AC motor without disconnecting it from power because you may suffer an electric shock.
The HVAC industry generally uses shaded-pole motors for low-power applications where high torque isn’t needed. For example, the fan motor in your AC unit is a shaded-pole motor.
STAT: According to a 2020 US EIA (Energy Information Administration) survey, 22% of Americans have air conditioning but do not use a central AC system. (source)