Equipment Solutions LFA-10 Linear Focus Actuator + SCA814 Servo Amplifier

Description

This auction is for a Equipment Solutions LFA-10 Linear Focus Actuator and Equipment Solutions CSA814 Linear Servo Controller.
The LFA-10 has the same specifications as the LFA-2010 actuator.
These units have a removable optics mount, and a base for the actuator.
I will email a copy of the LFA-10 data sheet, and SCA814 user manual.
These can be controlled via analog signals, or rs-232 control.
The non-contact optical feedback sensor allows for sub-micron resolution sensing.
Please ask if you have any questions.
Buyer to pay shipping.
Thanks for looking.
10 systems available.
The
LFA-2010 Linear Focus Actuator
is a high performance compact positioning actuator. It was specifically developed for applications requiring both high precision and high-speed positioning over a short to medium stroke. This product mates the voice coil motor to a perfectly smooth flexure guidance system and a very high resolution position feedback encoder. The LFA is well suited for optical focusing and other micro-positioning applications in markets such as semiconductor, medical, optical testing, scanning microscopy, circuit board assembly and micro manufacturing. The LFA-2010 has a 20 mm diameter clear aperture through its center, and 10mm of available stroke. Different configurations of stroke length, force constant, optic mounting, and other options are available as needed. The LFA20 come stock with either a c-mount thread or a 12.7 mm diameter lens socket. Other threaded holes also exist.
Voice Coil Motor:
The motor used in the LFA is a custom designed moving coil motor optimized using advanced computer modeling. The magnets used in Equipment Solutions motors have some of the highest magnetic flux densities available. The coil characteristics, including the resistance and inductance, were closely designed to match the capabilities of the
SCA814
Servo Controlled Amplifier. The motor can drive the stage to unparalleled accelerations and peak velocities.
Flexure Stage Guidance:
The LFA series uses flexures for guidance along the motion axis.  Flexures provide perfectly smooth motion. When designed and used properly they can have infinite lifetime. The LFA flexure and motor configuration is symmetric about a central axis where an optic is usually mounted. The resultant optical axis is coaxial with the motion axis of the flexure and the force vector of the motor, and this axis passes through the center of mass of the moving system, thus producing no net torque. The LFA flexure is stiff in all 5 cross-axes to the motion axis, except there is a small parasitic rotation about the motion axis that is proportional to the position on the motion axis. This parasitic motion is inherent in flexure systems, but which axis is left to the choice of the designer. ESI chose the parasitic axis to be a rotation about the motion axis that doesn’t affect the intended application for most customers.  Most LFAs are used in optical applications where a rotation of the optic about the optical axis is not an issue.
Position Feedback:
In its standard configuration the LFA uses a non-contact optical analog position encoder that makes it directly compatible with the
SCA814 Servo Controlled Amplifier
. The 50 nanometer positioning repeatability described in the specifications section assumes this sensor technology. The analog nature of the position sensor promotes the exceptionally high positioning resolution and bandwidth. For compatibility with digital servo systems the LFA-2010 can be optionally configured with a digital quadrature encoder.
Specifications
Clear aperture (option)
20 mm
Range of Motion
10 mm
Positioning Resolution
50nm (analog), 1mm (digital)
Peak Force
30 lbs  (for 10 sec.)
Max Continuous Force
4.5 lbs  (20 N)
Motor Constant
0.6 lbs/Amp (2.7 N/Amp)
Coil Resistance
1.5 ohms
Coil Inductance
100 uH
Travel Non-Straightness
<1 um   (Flexure)
Flexure Parasitic Rotation
0.1 degrees per mm travel
Dimension
75 X 75 X 75 mm
Total Mass
1.7 kg
Moving Mass
50 g
cable length (stock)
28” (700 mm)
The
SCA-814 Linear Servo Controller
was specifically designed to control single phase, non-comutated devices like voice coil motors. It is a high performance single axis DC motor controller and amplifier system. It is comprised of a highly integrated single PC board level product with a cohesive interface and a compact heat sink. This card provides current amplification and analog servo control interfaces. The single-phase characteristic of the very low noise current amplifier makes it particularly well suited for DC motors such as galvanometers and voice coils. It was specifically developed for control of motor applications requiring both high temporal and spatial servo precision, such as machine vision, inspection, scientific imaging, medical imaging and other business applications. This amplifier interfaces directly to most of the Equipment Solutions motor/stage solutions.
A bipolar linear or switching regulated power supply is required to operate the SCA814 amplifier. Typically better performance can be achieved when using a linear power supply. Equipment Solutions has several high-current supplies for this purpose including the
SPS-15
±15V DC Switching Power Supply.
Specifications
Servo Control Law:
Tunable PID, and Slew Rate
Closed Loop Bandwidth:
100- 1000 Hz, 500 Hz Typical
Command Input:
RS232 SPI, +/- 2.5V DC
Sensor Feedback:
Analog
P
osition DAC:
16 Bit DAC
Profile Generator:
Arbitrary 64 point | Unlimited Linear
Current output
:
Linear, 8A
Safety Protection:
Over Temp, Current, Position
Input Voltage:
+/-15V DC Standard
Communication
:
RS232C Standard
Operating Temperature:
0° C – 50°C
Size:
3.0 X 3.0 X 1.0 in. | 76 X 76 25mm
Weight:
6 oz.  |  165g