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News

New air motors for harsh-hazardous environments offer reduced power consumption, are lubricant free

Quadrant EPP : 05 September, 2003  (New Product)
New non-lubricated air motors for operation in harsh and hazardous environmental conditions have been jointly developed by Dynator, Nottingham, England and Quadrant Engineering Plastic Products. The new motors, which use components made of high-performance polymers made by QEPP, offer a power-saving alternative to electrical variable-speed and air-vane powered motors.
The operating principal of the Dynatork Air Motors is simple, but unique. The air motor uses an air supply of up to 100 psi (6.5 bar), which is controlled through an integral rotary valve. The valve sequentially directs air on to each of three pistons. The pistons drive a crank that imparts a turning motion to the motor's outlet shaft.

The resulting high-torque and variable low speed, with instant start/stop-output, makes the Dynatork Air Motor suitable for a wide variety of industrial applications. The air motor is particularly useful in paint and other liquid stirring applications, employed in many industries.

In the automotive industry, a paint plant recently converted its air-vane motors to Dynatork Air Motors, in order to achieve greater reliability at its 24/7-plant. The switch to the air motors, which run without any lubrication, avoids paint contamination from lubricants. The plant also now uses much less air to power its 42 paint stirring units: 1,240 scfm less. In effect, the switch to the Dynatork Air Motors is equivalent to adding two 600-scfm compressors. Further, the savings in compressed air results in a power saving of 152 kva.

The Dynatork range of power-saving, plastic piston air motors use aluminum or FDA compliant Acetron GP housings.

The success of the new Dynatork Air Motor is largely due to their use of two materials, from Quadrant Engineering Plastic Products.

For the piston, Ertalyte polyethylene terephthalate provides excellent dimensional stability in wet-air operating conditions. Also, the use of Ertalyte PETP eliminates the need for lubrication (silicone lubricants cannot be used in spraypaint shops), and the pistons made of PETP are quiet running.

For the cylinder liner, Ertalyte replaces brass components. This results in closer dimensional control, which improves piston sealing efficiency.

While standard Dynatork Air Motors use high-quality cast aluminum for the body housing, an alternative design has housings made of porosity-free Acetron acetal copolymer. The use of this material allows to the air motors to meet the regulations of the FDA and EU.
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