Aimed at data storage, wafer processing, high speed imaging and diamond turning applications, Aerotech's new ABS2000 air-bearing spindle combines a 6000 rpm cog-free, direct-drive brushless servo motor with a directly coupled high-accuracy rotary encoder for sub arc-second angular positioning and exceptional speed capability.
The new air bearing spindle is balanced to ISO 1940 G 0.4 - the highest grade for rigid rotors ensuring extremely low levels of vibration for the highest possible positioning performance. Furthermore, the ABS2000 includes a unique, externally accessed balancing system that allows balance adjustment when the payload is in place; further improving system response, production throughput and quality performance.
The ABS2000 is designed and certified for Class-1 clean room operation with a labyrinth seal arrangement minimising particle migration from the spindle. An optional rotary union may be specified for vacuum supply and customised versions can include mounting plates for optics and vacuum chucks with automated parts handling. Specialised versions for ESD can also be supplied including provision for grounding balls.
A custom designed, high efficiency direct drive motor provides more than 0.25 Nm of continuous torque with negligible heat transfer, minimising thermal expansion and eliminating the need for cooling fins or external cooling. This non-influencing motor design uses a slotless/ironless stator for cog free ultrasmooth velocity control and stability of the highest order with extremely small torque ripple for optimum control. The zero backlash motor is directly coupled to high accuracy encoder removing the wind-up and hysterysis associated with mechanical coupling based motor/feedback systems.
Velocity ripple is less than 0.1% with an asynchronous error below 20 nm and a total error motion of less than 100 nm. Measured and certified specifications also include bearing rigidity at 50 N/μm radially and 140 N/μm axially. As you would expect from such a precision device, the specification is backed up with documented plots for axial and radial error motion.
Encoder resolutions are 2048 lines/rev and 36000 lines/rev. When used with Aerotech's A3200 Automation Platform and the Npaq® drive rack, the spindle resolution can be as high as 0.05 arc-sec with no trade-off in speed. This makes the air bearing spindle ideal for high throughput, high accuracy applications.
Measuring 130 mm in diameter at the mounting flange, the ABS2000 is around 160mm long with optional metric or imperial mounting hole patterns. Axial and radial load capability is 178 N and 66 N respectively; the total mass of the complete assembly is 6.0 kg. The unit is supplied as standard in aluminium or alternatively in stainless steel. Aluminium versions can be finished in electroless nickel or black hardcoat. Built to last with effectively zero maintenance, the spindle is supplied complete with cables and connectors for motor power and feedback in configurable length to the customers' application requirements.
Aerotech provide a wide range of brushless drives for the ABS2000 and control options include the A3200 Digital Automation Platform, a software based motion/machine control system for IEEE-1394 (Firewire®) equipped PC's combining synchronised motion control for up to 32 servo axes with fully integrated modules for HMI, machine vision and soft PLC functions.
Other control solutions include the SoloistTM, single axis digital servo controller. With its integral power supply and brushless servo amplifier, it can provide an Ethernet based distributed drive solution with loosely coordinated point to point motion for up to 1000 axes.
Typical systems are supplied complete and fully tested to the customer's specification with product training available and full pre and post sale technical support. Along with motor power and encoder cables, all performance and calibration related documents are included, and a CD with full interconnection drawings helps system integrators with their own system documentation. Also included is all set-up data for system configuration including servo tuning parameters, making system commissioning straightforward, requiring little more than connecting cables and applying power before programming application software. These features are standard for every Aerotech product, ensuring that the true cost of ownership is extremely competitive.
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