BY M K JAYA PRAKASH M TECH 1 ST SEM MECHATRONICS

AIR MOTORS Devices which transform pneumatic energy into mechanical rotary movement Pneumatic power into shaft power Working elements operating on a compressed air Pressure is converted into torque Flow rate is converted into speed

WORKING

CATEGORISED ACCORDING TO DESIGN Piston motors Sliding vane motors Gear motors Turbines

RADIAL PISTON MOTOR Max. speed 5000rpm Power range 1.5 to 19kw

VANE MOTOR Speed can vary between 100 to rpm

GEAR MOTOR Speed range between 500 to 3000 rpm

TURBINE MOTOR

CHARECTARSTICS OF PNEUMATIC MOTOR Smooth regulation of speed and torque Small size (weight) Overload safe Insensitive to dust, water, heat, cold Explosion proof Large speed selection Maintenance minimal Direction of rotation easily reversed

VOLUMETRIC EFFICIENCY It is possible to slip forward from the high pressure port to the low pressure port through the clearance gaps this is called internal slippage. Actual flow rate = ideal flow rate + slippage Volumetric efficiency of the motor = actual flow rate/ideal flow rate

Cont…… Volumetric efficiency for radial piston motor Ideal flow rate= n*π/4*d 2 *l*N(r.p.s.) Where., n is no. of pistons D is diameter(in m*m) L is stroke length(in m) N is speed(r.p.s)

Applications Used in various pneumatic tools. Most popular are Hand held drill m/c Torque wrenches Also used in industries