Our solutions
Atlas Copco Rental
Solutions
Rental Fleet
Atlas Copco Rental
Offshore equipment
Oil-free air compressors
Rental Fleet
Oil-free air compressors
Oil-free air compressors
Oil-lubricated air compressors
Rental Fleet
Oil-lubricated air compressors
Oil-lubricated air compressors
Industries served
Compressors
Solutions
Products
Compressors
Industrial condensate treatment solutions range
Products
Industrial condensate treatment solutions range
Industrial condensate treatment solutions range
Industrial condensate treatment solutions range
Process gas and air equipment
Service & Parts
Compressors
Air compressor parts
Service & Parts
Air compressor parts
Air compressor parts
Air compressor parts
Air compressor parts
Maximize your efficiency
Service & Parts
Maximize your efficiency
Maximize your efficiency
Maximize your efficiency
Maximize your efficiency
Maximize your efficiency
Compressors
Industrial Tools & Solutions
Solutions
Industries Served
Industrial Tools & Solutions
Aerospace
Industries Served
Aerospace
Aerospace
Aerospace
Aerospace
Original equipment manufacturer
Industries Served
Industries Served
Products
Industrial Tools & Solutions
Air line accessories
Products
Air line accessories
Air line accessories
Air line accessories
Drilling solutions
Material removal tools
Products
Material removal tools
Material removal tools
Material removal tools
Material removal tools
Material removal tools
Material removal tools
Material removal tools
Material removal tools
Material removal tools
Service
Industrial Tools & Solutions
Atlas Copco service solutions
Service
Atlas Copco service solutions
Atlas Copco service solutions
Atlas Copco service solutions
Vacuum solutions

The design and working principle of the vane air motor

Vane air motors are produced with power ratings up to approximately 5 kW. It has a basic design and consists of only a few components.


Design

– A slotted rotor rotates eccentrically in the chamber formed by the cylinder and cylinder end plates.
– Since the rotor is off-center and its diameter smaller than that of the cylinder, a crescent-shaped chamber is created.
– The rotor slots are provided with vanes that move freely to divide the chamber into separate working chambers of different sizes.
– As a result of the centrifugal force, which is often reinforced by the compressed air, the vanes are forced against the cylinder wall to seal the individual chambers.
– The actual efficiency of these seals is a function of what is called ”internal leakage”.

Vane air motor components
1. Front end plate 2. Rotor 3. Vane 4. Cylinder 5. Rear end plate

Working principle

Air motor working principle

Working principle of an air motor

A. The air enters the inlet chamber “a”. Vane 2 has just sealed off the chamber “b” between itself and vane 3. The pressure in chamber “b” is still the inlet pressure. This pressure acts on vane 3, moving it in a clockwise direction.

B. The vanes have rotated further and the expansion process in chamber “b” has started. The pressure in it is thereby reduced but there is still a net force moving the rotor forward as the area of vane 3 is larger than the area of vane
2 in chamber “b”. Furthermore the inlet pressure acts on
vane 2 in the inlet chamber “a”.

C. The vanes have moved further. Chamber “b” is now being emptied through the outlet and there is no more contribution from this chamber. The force moving the rotor forward now comes from the force on vane 1 and vane 2.




Thanks to this simple principle the energy of the compressed air is converted into rotational motion from chamber to chamber, and the motor turns.