Powerful software for the design
of rotating electric machines
CONCEPT TO REALITY...FASTER
RMxprt quickly calculates the performance of rotating electric machines, allowing
designers to make initial sizing decisions and to evaluate hundreds of design
alternatives in a matter of seconds.
Overview
Today, design engineers incorporate With its machine-specific, template-based
electric machines into a variety of new interface, RMxprt is an ideal tool for
and traditional applications, renewing calculating critical design parameters,
the focus on miniaturization, increased such as torque vs. speed, power loss, flux
efficiency, and better performance. in the air gap, and efficiency. Designers
RMxprt helps electric-machine can use RMxprt as a standalone design
manufacturers capitalize on this growing tool or as part of a complete design
opportunity by allowing designers to solution that includes Ansofts Maxwell
make sizing decisions and to estimate for detailed electromagnetic-field
Single-phase induction motor.
performance during the initial stage of the modeling, and SIMPLORER, for power-
design process. electronic and drive simulation.
Electric-Machine Templates
RMxprt includes: Each machine-specific template includes
Induction Motors (single and three common rotor and stator configurations,
phase) running strategies, and drive circuits.
DC Motors (Brushless PM and PM) The templates include convenient auto-
Synchronous Motors (three phase, design features that automatically
line start, and adjustable speed) determine minimum slot geometry to
Switched Reluctance obtain the optimum flux density value,
Universal select the correct wire diameter for the
RMxprts interface allows users to enter machine
Synchronous Generators (three phase slot, calculate starting capacitance, and parameters quickly and easily.
and PM) select winding arrangements.
Results
RMxprt design sheets list all customize the design sheets to include which is very helpful for irregular
the relevant input and calculated foreign languages, additional data, and winding configurations, such as
parameters and a graphical display of links to Microsoft Excel for further
fractional slot windings.
waveforms, such as current, voltage, calculation. RMxprt also provides a
torque, and back emf. Users may graphical display of the winding layout,
Methodology
RMxprt uses classical
RMxprt provides engineers with an
electric-machine theory in
ideal starting point for studying complete
combination with a magnetic
systems, including electric machines,
circuit approach to calculate
power electronics, and controls.
performance. The software uses
Improved Schwarz-Christoffel
transformation to compute field computation. RMxprt uses a model based
distribution in both uniform and non- on distributed parameters to take skin
uniform air gaps and applies Gaussian effects into account and can calculate
Quadrature to treat the equivalent surface 3D end effects. Computation time is
Three-phase synchronous generator.
current or permanent magnet. Leakage extremely fastresults are available in a
field and corresponding inductance are matter of seconds.
derived based on the analytical field
Parametrics and Optimization
RMxprt includes an integrated range. Linear functional relationships
The software solves thousands
parametric-and-optimization capability between variables can be enforced during
of design variations in a matter
that allows users to automatically vary the optimization process, ensuring that
of minutes.
parameters within the template, such as a physical solution is achieved. The
the diameter of the rotor or the length objective can be any output quantity, such
of the stator. RMxprt will solve each manufacturing process to ensure that the as efficiency, total harmonic distortion, or
problem according to the parametric parameters are within a given tolerance a function of output quantities.
input and report the results in an easy-
to-read spreadsheet. For each solution,
Original Optimal
designers may view performance curves
to quickly evaluate how each defined
parameter affects the performance of the
design.
With its optimization features, designers
can evaluate the sensitivity of parameters
critical to the success of the machines
operation and can design to the
Optimization of total harmonic distortion of air gap flux
density in a synchronous generator.
Maxwell Links ANSOFT OFFICES
Electric machines are being applied
definition data for Ansofts Corporate Headquarters
in a variety of new and traditional
Maxwell products.
4 Station Square, Suite 200
RMxprt Maxwell applications creating aPA
renewed focus
Pittsburgh, 15219-1119
on miniaturization,
USA increased efficiency
geometry skew
Using Ansofts finite-element
materials stacking
winding info end effect
tel:performance.
and better +1.412.261.3200
RMxprt
technology, designers may further fax: to+1.412.471.9427
is designed help electric machine
study the machine to obtain e-mail: info@ansoft.com
manufacturers capitalize on this growing
The speed of the calculations in detailed motor performance www.ansoft.com
opportunity by aiding designers in
RMxprt allows designers to characteristics. The elite
making sizing decisions and estimating
quickly identify and refine the most combination of RMxprt and Maxwell
European Locations
France
promising concept before moving ensures that high-performance
Germany
to a comprehensive finite-element electric-machine designs are
Italy
study. RMxprt automatically delivered without the time and cost Sweden
produces geometry and problem of several prototype iterations. United Kingdom
Asia/Pacific Locations
China
SIMPLORER Links Japan
Korea
Singapore
and mechanical subsystems can
Taiwan
be added. The RMxprt model
RMxprt SIMPLORER
includes the combined effects of
lumped parameter slot geometries, spatial winding For a full listing of offices and
model of actual machine
geometry and nonlinear distribution, and nonlinear contact details, visit:
characteristics
materials. Using RMxprt and www.ansoft.com/contact.cfm
SIMPLORER together allows users
RMxprt automatically generates to adjust system control parameters
a state-space model that designers to accommodate a particular motor
can directly import into Ansofts and to ensure that the machine will
SIMPLORER , where power
perform as specified within the
electronics, control block diagrams, desired system.
We would like to thank Siemens for allowing us to use
their press pictures on the cover of this document.
Maxwell 3D, Maxwell 2D, SIMPLORER, RMxprt, Maxwell SPICE, and Optimetrics are trademarks
of Ansoft Corporation. All other trademarks are the property of their respective owners.
PL27-0203
2002 Ansoft Corporation. www.ansoft.com
