ADVERTORIAL TECHNOLOGY IN ACTION MotorSolve - Generator Module
nfolytica has provided state-of-the-art Electromagnetic simulation software for magnetic, electric, and thermal analyses since 1978. Engineers from a wide range of industries use Infolytica's software to design and analyse applications including electromechanical devices, non-destructive testing, induction heating, and industrial transformers. Although general purpose software can (and is) extremely useful, we have found that some more specialised tools also have a very important role to play.
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MotorSolve is one such specialised tool. It is specifically a Design Tool for BLDC, IM, SRM, and brushed DC motors. It is aimed at designers who require answers quickly and accurately. There is a sizing feature (based on classical methods) to prepare an initial design, and adjustments later made using template data entry with accurate FEM then utilised. The integrated thermal modelling allows temperature effects and cooling strategies to be tested for BLDC and IM machines, all in a single package. The latest version also specifically includes Generator design as part of the tool, allowing generator specific design charts and results to be obtained.
Design Methodology
MotorSolve breaks tradition and gives a fresh look at electric motor design software, taking full advantage of today’s advanced computing capabilities. The modern user interface is intuitive and provides extensive feedback making it easy to use
MotorSolve sizing feature computes an initial value for several parameters related to the size of the machine based on general design parameters. The following initial choices are to be made: • Maximum Outer diameter • Maximum height • Number of phases, poles and slots • Rotor topology • Stator slot shape
Generator Analysis in MotorSolve
Figure 2: Voltage Regulation Results - A chart of the generator's voltage, as a function of output power.
The full range of analysis and performance data can be obtained for the electric motor as before, but with the inclusion of the new Generator Analysis option, it is possible to prepare generator specific performance and analysis charts. The various Performance Charts available including: • Voltage Regulation This is used to help control terminal voltage (see Figure 2) • Voltage vs. Current Display Voltage as a function of current and impedance (see Figure 3) • Power vs. Speed Used to display Power as a function of speed and load impedance (see Figure 4) Additionally, there are four analysis charts which you can use for detailed Generator analysis
Figure 3: A chart of the generator's maximum output power, as a function of speed.
Operating points This generates a chart of the selected quantities related to the short-circuited and maximum power point of the generator. The results are calculated from the nonlinear D-Q model of the motor, obtained from a FEA solve of the currents between 0 and the short-circuit current.
D-Q analysis DQ Analysis is available for infinite bus and impedance loads. Results can be obtained in single values or as charts.
• Ideal for what-if analysis: initial sizing or design variations • Rapid: based on a single FEA simulation to characterize the performance
Reduced Order model analysis Reduced order model analysis is based on a reduced order model of the generator obtained from a field analysis. Load type can be set as impedance or diode bridge. • Perform a dynamic simulation of the electronic commutation in a three-phase full-bridge • Squarewave or Sinewave • Important at high speeds: current waveforms differ significantly from the ideal
• Also supports non-linear PWM analysis method
Motion Analysis Motion Analysis is the most complete analysis. It is a pure field based analysis and hence calculates all the physics that is involved in the working of the machine • Perform a full time-stepping non-linear FEA simulation to simulate a generator connected to resistive/inductive load • Wye or Delta
• Sinusoidal or six-step drive • Highly accurate for all types of operating conditions and ideal for final design verification
Load configurations
A number of load types can be included in MotorSolve, including: No load (Open circuit), Short-circuit, Passive Impedance loads (plain resistive/inductive loads), Infinite Bus (connection to a large AC system or grid), Diode Rectifier.
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Figure 1: Gorges Diagrams for the winding layout, automatically generated in MotorSolve, (left) an ideal diagram for a 100% winding factor, and (right) the present example of a Dyno 12-slot 10-pole generator having a 93.3% winding factor.
36 FEBRUARY 2017 | DESIGN SOLUTIONS / DESIGNSOLUTIONS
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