PRODUCTS & APPLICATIONS MOTION CONTROL & LINEAR MOTION PRECISION CHIPS FOR MOTION CONTROLLERS
An optional ‘user-defined profile mode’ feature, which provides the capability for multi-axis synchronised continuous path profile generation on the chip, is now available on Magellan Motion Control ICs (integrated circuits or silicon chips). The chips, which are manufactured by Performance Motion
Devices and available in the UK from INMOCO, are designed for use in dedicated motion controllers, meaning they are suitable for applications such as 2D and 3D printing, robot control such as SCARA arms, biological and medical laboratory testing, glue laying, laser cutting and military equipment. According to the company, the user-defined profile mode is a flexible system for reading a stream of incoming positions or time values and using them to generate a corresponding continuous stream of commanded output positions. Because the relationship
between the incoming data stream and the output positions can be flexible, any desired shape can be drawn. The profile mode allows one of three master axis sources to be selected: actual position from an external encoder; commanded position from an internal profile, or time – determining the speed, whether the contour is synchronised to an external or internal source, and whether the contour is always traversed forwards or may also be traversed backwards. When actual position is used as the source, an external encoder is used and the speed and direction is
entirely controlled by it. This provides a cam function, where execution of the internal user-defined profile is synchronised to an external mechanism or other electronic signal source. With the master axis source set to commanded position, one of the Magellan’s internal axes provides the position datastream that is used to traverse the user-defined contour, providing velocity control. If the master axis source is set to time, the internal clock provides the incoming data, and all available axes can be used to drive the motors. There are six settable parameters: ‘Master source’ selects the source of the incoming position or time
data stream; ‘Master axis’ number selects the axis number of the incoming signal; ‘Rate scalar’ allows the incoming master source data stream to be accelerated, slowed down or reversed; ‘Start position’ and ‘Start index’ set where the profile will begin; ‘Stop position’ specifies the finish position or time; and ‘IBufferID’ and ‘PBufferID’ specify the memories that hold the incoming and output position data. Once set, these describe a particular mapping from the incoming data from the master axis to the
driven axis commanded output positions. This mapping approach to profile generation forms the core of the user-defined profile mode and ensures that synchronisation to the incoming data stream is automatic. As a result, if the incoming data slows down or speeds up, the output exactly matches the speed change.
INMOCO T: 01327 307600
www.inmoco.co.uk OPTIMISING MOTION
Three actuators have been added to Festo’s Optimised Motion Series (OMS) of electrical positioning systems. The guided EPCO electric cylinder – EPCO-G – provides simple positioning with strokes of up to 400mm and can withstand high axial and radial loads. Easy to mount, this is available in three sizes, can achieve speeds up to 500mm/s, provides high stiffness and low weight, and has life-time lubrication. The ERMO is an electric rotary drive
suitable for compact process stations and pick and place applications. This offers a maximum angular velocity of 600˚/sec, torque of 5Nm and repetition accuracy of between ±0.05˚ and ±0.1. Also new, the ELGR linear belt drive
axis is available with a corrosion resistant chrome rod and bearing material. This is a cost-effective solution for feedforces up to 35kg and is available as a completely mounted sub assembly. All products in the OMS product family can be easily mounted together to create a complete two, three or four axis handling system.
Festo
www.festo.co.uk
ENERGY EFFICIENT LINEAR MOTOR ROD-STYLE ACTUATORS
The energy efficient ETT series of linear motor rod-style actuators from Parker has been expanded. Available in four lengths and four sizes, the tubular motor series delivers thrust values of up to 2083N peak force, travel speeds of up to 8m/s, accelerations of up to 350m/s2
, and has repeatability
of ±0.05 mm. Precise control and positioning are guaranteed through the use of a 1Vpp Sine/Cosine encoder. These are ‘direct drive’ actuators,
so the motion is generated without mechanical transmission elements like ball screws, toothed belts or gearboxes. According to the company, these are an alternative to pneumatic cylinders in
applications that demand greater flexibility and positional control, as well as precise control of force and speed. They are also suitable for high duty cycles without the need of additional cooling, so the motor’s high thermal efficiency, reliability and mechanical life are extremely high. The actuators are designed to be controlled by any standard servo drive with either a 230 or 400 (ETT080) VAC supply voltage. The actuator is suitable for linear
handling and pick & place applications requiring high dynamic performance.
Parker Hannifin
www.parker.com
PACKAGING THE RIGHT SOLUTION
For a recent project, Colin Mear Engineering needed to produce a compact yet flexible, multi- purpose packaging machine that would enable a
high product throughput. The machine needed to take the product and pack it into a two-piece container, which would then be inserted into a foil envelope, sealed and offloaded at a rate of 84 pieces per minute. For this, a precise and reliable carousel system was needed. To meet the demands, HepcoMotion supplied its DTS2M driven track system with 16 carriages equally spaced around the rectangular format track. The design used a twin drive scroll system that provided a direct and highly dynamic drive, enabling an index distance of 500mm to be achieved in just 0.5 seconds. The linked track system offered an accurate and repeatable indexing movement, a vital requirement when items are being processed in such a short cycle time. Thanks to the solution, a packaging line has been
developed that can be used in multiple industries such as food, tobacco and pharmaceutical.
HepcoMotion 26 NOVEMBER 2015 | DESIGN SOLUTIONS
www.hepcomotion.com / DESIGNSOLUTIONS
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