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| Cello
Servo Drive Application |
| 7 Cello
Digital Servo Drives
were integrated into an automated ceramic tile patterning machine.
Mounted in the control cabinet, the Cellos control the position
of the three patterning tools as they create effects on the
surface of decorative tiles. |
| A leading manufacturer
of ceramic tiles asked the Motor Power Company (www.motorpowergroup.com)
to help them create a new ceramic tile patterning
machine that would meet the following objectives:
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simplified machine design |
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total elimination of
kinematic chains |
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equal distribution of
power and intelligence |
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reduced machine assembly
time |
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reduced maintenance |
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energy savings |
| Existing effect and patterning
machines were huge, expensive to maintain, and expensive
to operate. Modern motors, drives and systems offered
the potential to significantly improve upon these issues. |
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| A Cello
digital servo drive is connected to each axis
on a Ceramic Tile Patterning Machine |
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Application
Engineers at Motor Power Company tackled all the issues
at once.
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the processed
information. Items are sliced into uniform units
(weight or shape)
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| Direct
Drive Linear motors were used to eliminate the previous
problems associated with vibrations. By using linear motors,
extra support structures and dampers could be eliminated
thus significantly reducing the size of the machine and
its complexity. |
| Intelligent
drives were added to each axis thus significantly increasing
the machine’s flexibility and capabilities. The “intelligence”
in the servo drives enabled Motor Power Company to write
application-specific drives were added to each axis thus
significantly increasing the machine’s flexibility
and capabilities. The “intelligence” in the
servo drives enabled Motor Power Company to write application-specific
software that enabled pattern profiles to be controlled
by the drives alone, without the need for a centralized
motion controller! In this implementation the profiles
are generated on a PC and transmitted to the servo drives
via a CANopen network. |
| Design
Simplification |
| The X and Y axes
were respectively fitted with linear and torque motors that
were able to carry their loads without any intermediary components.
This decreased the component count and increased the machine’s
reliability. |
| Reduced
Machine Assembly Time |
| The use of motors
that are connected to their loads without additional transmission
components vastly simplifies machine assembly and maintenance
tasks. |
| Reduced
Energy Costs |
| Reduced component
count also reduces the energy losses associated with transmission
equipment. |
| Reduced
Maintenance |
| Direct drive componentry
simplifies maintenance tasks significantly by eliminating unnecessary
components and linkages. |
| Distributed
“Intelligence” |
An Elmo Motion
Control Cello digital servo drive was used on each axis.
These drives contain a digital signal processor for motor control,
feedback and programming. By using Elmo drives, and custom-written
software, Motor Power Company was able to eliminate the need
for a centralized motion controller, at a significant cost savings.
In this design, Motor Power Company uses a PC to generate motion
profiles for each axis. The profiles are sent to the Cellos,
in PVT format, over a CANopen link.
The CANopen bus also contributes to the overall cost effectiveness
and reliability of the design, because it enables daisy-chain
communications rather than a dedicated communication and control
cabling for each axis. |
| Cello
Digital Servo Drive |
The Cello is a fully
digital servo drive that delivers up to 3 KW of continuous
power (and 6 KW of peak power) for DC brush, brushless
and linear motors. It can operate in current, velocity
or position modes and functions with a wide variety of
feedback options including Incremental Encoders, Resolvers,
Interpolated Analog (Sine/Cosine) Encoders, tachometers
and potentiometers.
The Cello features sinusoidal vector control, trapezoidal
vector control, trapezoidal six-step and DC commutation
methods. The Cello has an auxiliary feedback port for
ECAM, Follower, Dual Loop and Pulse-and-Direction applications.
Digital and analog ports are also available.
Integrated into the drive is highly efficient power switching
technology aligned with Elmo’s especially fast implementation
of CANopen networking (DS-301/DS-402) protocol. Two CANopen
ports are installed along with one RS-232 serial port
for communications.
The Cello is fully programmable with Elmo Motion Control’s
programming language (32 KB of memory is available for
storing programs). Using Elmo’s Composer setup tool,
Cello users can perform drive setup, configuration, tuning,
analysis and drive programming quickly and easily. |
| For more information:
click Here. |
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Cello Digital
Servo Drive
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