Aerotechs new linear servo amplifier range provides a stand-alone analogue
interface or intelligent networked drive solution for any brushed or brushless
3-phase servomotor. The amplifiers operate transistors in the linear range,
so the non-reliance on pulse width modulation (PWM) means the electrical noise
is significantly lower a vital characteristic where interference with
other controls in the system could pose problems.
Providing up to 3-phase commutated output, the direct on line 115230Vac
standalone linear servo amplifiers are especially suitable for users demanding
stability and high accuracies without any of the inefficiencies caused by dead
bands found in equivalent PWM systems. Using ±10V or FireWire based command
inputs they can commutate up to three brushed motors, providing either velocity-
or current-loop control via separate analogue outputs.
Users will benefit from a host of features; one of the most advantageous being
the amplifier's 'out of the box' set up. This is especially apparent when matched,
in a system, with other Aerotech hardware such as controllers and amplifiers.
When supplied in this form, the company will also provide all drawings, cables,
parameter files for the controllers and significant documentation. Connection
to Aerotech's A3200 motion platform reveals every diagnostic detail the user
could need. The whole package is backed up with comprehensive local support
as well as training which can be performed on site or at a dedicated training
facility.
Primary markets suggested by Aerotech include semiconductor manufacturing,
flat-panel manufacturing and inspection machines; in applications ranging from
air-bearing stages, co-ordinate measurement machines, X-Y stages, scanning equipment
and medical device fabrication. They are suitable for applications that demand
high performance, high bandwidth and smooth velocity in combination with low
electrical noise.
The BL amplifier is a complete modular package. It includes an internal heat
sink, which operates in combination with temperature compensation, as well as
control and bus power supplies. It operates at ±40VDC (10A or 20A peak)
or ±80VDC (10A peak) and features a self-commutation mode, using analogue
or digital Hall effect feedback signals. It also includes a 5VDC 250mA supply
to power encoders and Hall-Effect devices. The power stage is also completely
isolated from the control stage reducing electrical noise yet further.
The amplifier is protected against control power supply under voltage, excess
rms current limit, power stage bias, supply under voltage, over temperature,
over current and excessive power transistor dissipation. Operating modes include
current command, velocity command, or dual-phase command (for brushless operation
only). For brushed operation, operating modes available include current command
and velocity command.
Differential inputs are used for better noise immunity. Velocity feedback is
from either an encoder or tachometer, and logic inputs include directional current
limits and shutdown. Fault, current, and velocity outputs simplify monitoring
drive status. The NL amplifier uses the same base amplifier but can be connected
to the A3200 digital motion platform via FireWire. The networkable NL model
converts the digital signal to analogue using a very high resolution D to A
converter. And, through the use of a discrete sampled system (updated at 20kHz),
there are fewer quantisation errors digital anomalies
that arise when curves are converted into best-fit steps.
Aerotech is a World leader in the design and manufacture of advanced motion
components. It is unique in its ability to supply complete systems in which
each component is matched precisely not only to the application but
also to each other. This product synergy ensures quality, reliability, accuracy
and the most effective cost of ownership.
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