COVER STORY ADVERTISEMENT FEATURE
integration of the Nitek Green Drive actuators into any existing system. A new addition to the linear motion range is the Rotolinear GDR motor,
which is linear motion with a twist. The GDR Rotolinear integrates into one mechanical arrangement, Nitek’s Green Drive linear actuator technology with a brushless motor creating controlled rotation with linear motion. Each of the motors can be controlled independently for interpolation solving applications like Capping and Pick & Place with Rotation. Three models are available with linear forces to ~400N peak and nominal torque to 2.9Nm. The Nitek Rotolinear motor, when combined with the Copley Controls dual axis servo drive, is a cost effective solution and sets new levels of performance, connectivity and flexibility. Servo Components & Systems also offers a linear tubular motor, which
can be used in a module version with moving carriage, or with multi- carriage configurations. The GDM linear motor version uses an integrated linear guide system and integrated low cost magnet type encoder. The GDM motor can also be configured into XYZ gantry systems for pick & place applications. The linear motor has peak force capability to 396N, position repeatability to 0.05mm and velocity to 5m/s. The payload conveniently mounts directly onto the motor carriage forcer. The moving forcer has internal coils that surround the permanent magnet thrust rod. Interaction between the forcer’s electrically energised coils and the thruster’s permanent magnet field, produce motor drive force, allowing it to travel
smoothly along its stroke length. Modern linear motors, benefitting from advances in design, magnetic materials and electronic controls, raise machine throughput, precision and reliability. With form factor matching that of a ballscrew, the clean rugged design of the GDM direct drive electric linear motor
provides a direct replacement to ballscrew linear solutions. The linear motors forcer, which carries the payload, does not make contact with the thrust rod. Freedom from contact eliminates friction- induced wear and subsequent performance degradation. No friction means no need for lubrication, simplifying maintenance.
The absence of lubrication provides a further advantage during higher velocity moves, increasing velocity in a ballscrew can possibly cause lubrication to spin off and contaminate both workpiece and work environment. Lubricant clean-up involves costly downtime. Direct drive linear motor systems tend to be regarded as costly solutions
to intractable and highly specialised problems. Invariably, someone else’s problem! In reality, the electric linear motor is often the most economical solution, even where alternative drives meet technical specifications. Several factors contribute to the electric linear motor’s cost
effectiveness. Electric linear motor costs have declined significantly in recent years, thanks to the benefits of scale and steady reduction in the cost of rare earth magnets. In addition, the high performance servo amplifiers needed for powering and controlling them have made the transition to all-digital technology. Finally, the electric linear motor’s enduring uptime ensures profitable
operation, bringing down life cycle costs and cost of ownership well below that of a typical ballscrew installation.
Servo Components & Systems
www.servocomponents.co.uk See us at PPMA Total (27-29 September, NEC, Birmingham) on Stand A37.
DESIGN SOLUTIONS | SEPTEMBER 2016
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