1.Overview of Single-Phase Motor

Single-phase motor refers to an electric motor that runs on a single-phase AC power supply (usually 220V). It is one of the most commonly used power sources in air compressors, especially suitable for household and small industrial applications.

Basic features:

Power requirements: 220V single-phase AC

Power range: usually between 0.5HP (370W) and 5HP (3.7kW)

Starting method: capacitor start/capacitor operation, split-phase start, etc.

Speed: generally 2850rpm (2-pole) or 1450rpm (4-pole)

2.Requirements for single-phase motors in air compressors

High starting torque: need to overcome the high back pressure at the initial startup of the compressor

Frequent start-stop capability: the compressor is usually controlled by a pressure switch, and the motor needs to adapt to frequent start-stop

Thermal stability: long-term operation requires good heat dissipation design

Overload protection: built-in thermal protection device to prevent motor burnout

Low noise: especially sensitive to noise in the home environment

3.Typical applications of single-phase motors in air compressors

(1). Small household air compressors

Power: 0.5-2HP

Applications: air nail guns, tire inflation, small spraying, etc.

Features: portable design, noise controlled below 65dB

(2).Commercial air compressor

Power: 2-5HP

Application: Auto repair shop, small processing workshop

Features: Strong continuous working ability, large air tank capacity

(3).Special air compressor

Oil-free air compressor: adopts special sealing design, the motor needs to adapt to the oil-free environment

Silent air compressor: specially designed motor and soundproof cover

4.Selection guide

When selecting a single-phase motor for an air compressor, you should consider:

Power matching: the motor power should be 10-15% greater than the compressor shaft power

Starting characteristics: capacitor start/capacitor run (CSIR) type motor is preferred

Energy efficiency level: IE2 or higher energy efficiency level is preferred

Protection device: thermal protector must be built-in