Simple mechanical device assures constant speed

If the motor drives the impeller too fast then cavitation occurs. The resultant bubbles in the paint will give a poor finish. And if the paint is metallic its suspended metal flakes will get crushed producing an aesthetically flat and therefore equally unacceptable finish. Conversely if the speed is too low the paint will simply settle out.

The Huco Dynatork air motor is ideal in such an application as unlike a vane motor it is eminently controllable. Its free-floating piston design transmits maximum torque on actuation which can be regulated to fine limits by a self adjusting control valve set on the air inlet.

Pulse counters can be specified to programme direction of rotation, speed and number of revolutions. This means the motors can provide near instant stop/start/reversal and drive under load with characteristics similar to those of a stepper motor.

Until now an electronic controller was the obvious choice for these motors but now Huco Dynatork has introduced its own pneumatic regulating valve set that ensures constant speed regardless of load.

This new Huco Dynatork controller comprises two control valves. The first controls air pressure and the second adjusts flow rate. The controller works by sensing pressure drop across an orifice. Any reduction in pressure is proportional to flow rate and by feeding back this value to the flow control valve via a diaphragm air flow is adjusted accordingly. This enables the constant speed of the air motor to be maintained automatically.

The Huco Dynatork controller is introduced in two sizes to suit the model of air motor.