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Winding drives can be found in many production processes: they wind continuous materials before or after their handling on spirals, rolls, reels or balls. The spectrum of material to be wound ranges from base paper of up to 10 metres wide or thin film with a thickness of 6 μm, to carbon fibre threads with low elasticity and high durability against tearing. Every material to be wound places different requirements on the winding drive due to their specific features in terms of surface, hardness, tensile strength, cross-section profile or thickness. Reams of paper with a roll diameter of around two metres for example are wound at a high speed of up to 2000 m/min. Films are a sensitive material which must be wound or unwound very precisely. The winding of metals on the other hand means that large masses are in play which influence the winding process. Pneumatic motors are safe and robust drive systems providing a drive solution for winding processes.
A pneumatic vane motor consists of a rotor which turns inside an offset chamber in the rotor cylinder. The vanes in the rotor are pressed against the wall of the rotor by centrifugal force creating working chambers. Inside these chambers the sealed compressed air expands and pressure energy in changed into kinetic energy and the rotor turns.
Pneumatic motors are characterised by the fact that the speed automatically adapts as the load changes. The pneumatic motor runs idle when fully loaded. When a lower load is applied and a lower torque on the motor spindle then the working speed is close to idle speed. The working speed is reduced as soon as the torque increases. At 50 percent of the idle speed the pneumatic motor reaches maximum power. “This is also the optimal working range of the pneumatic motor. In the range between 40-50% of the idle speed the pneumatic motor is particularly energy efficient. A criterion to which we particularly pay attention during motor design”, explains DEPRAG Product Manager for Airmotors Dagmar Dübbelde.

More information: DEPRAG SCHULZ GMBH u. CO.