Motors are decreasingly viewed as drop in components and more and more seen as integrated parts on a machine, according to motor marketing guru, Dan Jones. Known as "parts sets," frameless motors have been found in precision inspection and metrology systems for years, wherever high accuracy is in demand. They're an obvious choice for semiconductor makers. They can show up as well in aerospace apps where the room and materials they don't use amounts to a definite flight advantage.
Bosch-Rexroth
The company's IndraDyn T synchronous motors, delivering torque up to 4,700 Nm, are available as liquid cooled units with stator diameters out to 565 mm and rotor IDs up to 410 mm. Common in machining centers and rotary tables, the motors also find use in robots, lathes, and injection molders. Motor speeds up to 1,200 rpm are accompanied by low (&0.1 percent) torque ripple. The company integrates thermal sensing in the three-phase windings for overload protection. For a brochure describing the IndraDyn T motors, visit http://rbi.ims.ca/4402-516.
Primatics
This manufacturer of positioning stages integrates frameless Emoteq motors into nearly all of its custom designs and most of its standard designs, says sales and marketing manager Kyle Tomson. About the only customers still requesting in-line motors are systems integrators who are often constrained by specs calling for specific motor, controller, and drive combos. The benefits of the frameless motors are many, Tomson says, but primarily it's the elimination of a coupling and what it drags into a system in the way of wind up and phase delays. For a recent Primatics newsletter which explains benefits of frameless motors on positioning stages, visit http://rbi.ims.ca/4402-517.
Applimotion
The company's line of ULT direct drive frameless motors recently expanded its stator diameters out to 355 mm. Torques range from 1 to 1,000 Nm. These motors connect directly to standard 3-phase brushless amplifiers or to digital drives and feature low profile axial height and 10 to 1 ratios of diameter to length, according to Managing Director Robert Mastromattei. The company's motors are expanding beyond its precision inspection systems business to include satellite tracking systems and medical pumps. The company easily customizes its rotor hubs to integrate with the mechanics of the machines to which they mount. Its products range from low volume, performance designs made in-house to high volume units that are value-built through its Asian manufacturing partner, ACM. To download a datasheet on Applimotion's ULT frameless motors, go to http://rbi.ims.ca/4402-521.
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