High performance linear motor based actuators
07 July 2009
Festo has unveiled a class of electric actuators, based on very high performance linear motors. The first product in this class is an ultra precise linear motor axis with an air bearing, which is available for immediate delivery. Subsequent products, due to be launched progressively throughout this year, include three types of electric cylinder, all featuring unique – and heavily patented – tubular motor technology.
Festo’s ELGL-LAS linear motor axis employs a magnetically preloaded air cushion bearing to ensure precise positioning and linearity. The motor is a conventional linear synchronous design; the stator takes the form of a fixed bed, and the windings in the moving carriage are fed with drive signals from the motor controller. The carriage features an integrated displacement transducer to provide digital position feedback to the controller, and up to three carriages can be used on the same bed and controlled independently. The carriage also contains a series of embedded permanent magnets to provide an integrated locking brake function – the carriage is only free to move when the air cushion overcomes the magnets’ attraction to the fixed bed. Furthermore, the use of an air cushion bearing minimises friction in the guide components, making lubrication and routine maintenance unnecessary.
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