Control Group, Inc.
was founded by a group of scientists specializing in various
areas of Motion Control, Medical, Neural Network and Digital
Signal Processing. The company has been intensely involved
in the development of DSP-based control chips and boards serving
the medical, defense, general automation and machine tool
markets. The founders of DSPCG carry many years of academic
research and industrial experience in: DSP and ASIC gate array
design, theory of optimum control, and the application of
Kalman filtering in motion systems.
Sy Meshkat, the company's president, has many years of experience
as a professor of Electronic Engineering, Director of Advanced
Technology at Electrocraft Corporation and consultant with
the DSP division of Texas Instruments. He has designed and
taught Texas Instruments DSP Control Workshops nationally.
Dr. Meshkat has published well over 100 technical articles
and authored three books in various motion control areas.
His recent publication DSPs in Motion Control is being taught
by Texas Instruments DSP Control workshops. He holds numerous
patents in the areas of multi-processing parallel DSP motion
controller design, Robust motion controller design and, Current
synthesis in motion control drive systems. The company has
worked with Texas Instrument as a third party since 1990s.
Drawing on the scientific background of its founders, the
company offers the fastest and most advanced controllers on
the market. This was confirmed by a comprehensive study performed
by the Oak Ridge National Labs/ Martin Marietta on Evaluation
of Mx4 in Advanced Machine Tool Accuracy Compensation. The
evaluation was completed in July of 1994 and the resulting
report is available by Oak Ridge National Labs Y12 Plant.
To date, Mx4 is the only multi-DSP controller on the market
with the computation speed about ten times faster than all
competing products. This is the result of using four DSPs
in a hyper-cube hardware architecture. Other unique features
include Kalman filter, programmable Notch for resonance cancellation,
state feedback control, Vector control, programmable motor
technology and PWM frequency. DSPL as a powerful control language
is supported by a compiler for ease of programming and troubleshooting.
The compiler results in an optimized and fast executing code
consistent with the nature of the devices (DSPs) on which
it will execute.
DSPCG is proud to announce that only five years after
the installation of the first Mx4, over 40000 multi-axis Mx4s
operate in three-shift operations around the world. Applications
served include: military telescope, radar positioning, machine
tools, CNC, robotics, laser imaging, semiconductor handling,
IC wire bonding, packaging, textile, etc.
Open architecture means independence from a single source
supplier of "total system". The Mx4 controller is the world's
first fully digital open system that is configurable to all
industrial motors, power switches and sensors. This product
allows real-time implementation of computer control strategies
required for servo control of brush-type DC, brushless DC,
AC induction and variable (switched) reluctance motors. An
Mx4 controller can be configured for any motor with a single
command. Furthermore, drive parameters such as Pulse-Width
Modulation (PWM) output frequency, current limit and current
gains are also configurable via real-time commands. The Mx4
controller interfaces with all commutation and incremental
encoder sensors and allows the user to determine the number
of motor magnetic poles for each axis. High-speed parallel
processing allows for a more compact implementation of the
control instructions for multiple motors. Each Mx4 instruction
allows multiple axes to be programmed with only a single line
command. The advantages offered by such flexibility open the
door to a new era for motion computer control. For the OEM
application, this flexibility enables the engineer to upgrade
any part of a subsystem when such an upgrade is economically
feasible. For example, the OEM engineer may select a brushless
DC Motor (a relatively expensive choice) and finish the system
design. Later, the engineer can replace the brushless DC motor
with an AC induction motor without changing the hardware.
That is, motor replacement does not require a change in power
stage, power supply, or control electronics. The corresponding
software change for motor replacement is only one line as
motor_tech( 2, brushless_dc ); motor 2 is brushless
motor_tech( 2, ac_ind ); motor 2 is ac induction
flexibility afforded by the Mx4 speeds up the product development
time by allowing the engineers to make a final economical
decision later, when they learn more about their application
needs without major changes in software or hardware.
The interactive multimedia tutorials allow the users of
a DSPCG product to learn about various features of the product
and its programming methods. The tutorials cover hardware
architecture, system connections, DSPL programming and object-oriented
programming using Visual Basic and C++ programming techniques.
Multimedia Manuals In addition, the CD ROM contains Hypertext
manuals through which information may be found per user's
preferred method of categorization. For example, the user
may pose a hardware question by typing in the connector name
or the system function in which that connector is used. Accordingly,
the user may find the information on a desired software feature
by specifying the application category, function category
or simply typing the command name itself.
Control Group, Inc.
4445 West 77th Street
Minneapolis, MN 55435
Phone: (952) 831-9556
Fax: (952) 831-4697