Air Motors/Gearmotors - GAST - (Version JPG) - Page n° 2 - PDF Catalogue | Technical Documentation



	Typical Applications • Mixing Equipment • Conveyor Drives • Pump Drives • Food Packaging • Pharmaceutical Packaging • Hoists and Winches • Hose Reels • Fiberglass Choppers • Tension Devices • Turntables The chart below shows general performance ranges of our lubricated Air Motors. See if we have the right offering for your application. Air Motors	How to select an air motor. Air motors differ in many ways from other power sources. These unique operating characteristics must be considered when selecting an air motor for a particular job.
		It is easy to change horsepower and speed of an air motor by throttling the air inlet. Therefore, the best rule of thumb for selecting an air motor is to choose one that will provide the horsepower and torque needed using only two-thirds (²/3) of the line pressure available. The full air line pressure will then be available for overloads and starting. • Output Power vs Speed. The output power of an air motor is relative to speed and to air line pressure. • Torque vs Speed. 1. An air motor slows down when load increases... at the same time its torque increases to a point where it matches the load. It will continue to provide increased torque all the way to the stalled condition, and it can maintain the stalled condition without any harm to the motor. 2. As the load is reduced, an air motor will increase speed and the torque will decrease to match the reduced load. 3. When the load on an air motor is either increased or decreased, speed can be controlled by increasing or decreasing air pressure. 4. Starting torque of an air motor is lower than running torque. While this provides smooth, no-shock starting, it is necessary to have additional air line pressure for starting under heavy loads. • Air Consumption vs Speed. Air consumption increases as speed and air pressure is increased.

	speed - rpm (output)

	Use of Air Motors in Hazardous Atmospheres

	At the present time, there are no known standards governing the operation of air motors in hazardous atmospheres. However, there are several points regarding the safety of air motors. First of all, an air motor is not a source of electric sparks. However, it is possible that an article which is not part of the air motor (e.g., wrenches, hammers, etc.) could create a spark by sharply impacting a cast iron or aluminum case or the steel shaft of the air motor. [Note that electric motor enclosures for both class I and II hazardous locations can be made of ".. .iron, steel, copper, bronze, or aluminum..." (UL 674, Electric Motors and Generators - Hazardous Locations, June 23, 1989; paragraph 4.2, page 6)]. Second, an air motor housing is not designed to contain an internal explosion as is an explosion-proof electric motor. The only possible internal source of ignition in an air motor is a contact between the stationary housing components and the	rotating elements that might create a spark. The likelihood of this occurring is reduced by the fact that the contact must be made at precisely the same time as a flammable or explosive gas is introduced into the air motor in a sufficient quantity to achieve a flammable or explosive mixture while overcoming the positive pressure of the driving gas. In other words, although highly improbable, an internal explosion in an air motor is possible. Finally, an air motor is designed to be operated by compressed air, the expansion of which in normal operation creates a cooling effect. As a result, the temperature of the air motor will not exceed the higher of the temperatures of the surrounding atmosphere or the air delivered to the inlet. We do not guarantee the safety of every application, but to ensure the safe operation of an air motor in your application, always follow the product directions and consult with a qualified engineer.

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Air Motors/Gearmotors - GAST - #2

Vacuum generator, Oil free compressor, Gear-motor, Stationary compressor, Ejector