Electrical: New Applications
http://www.maplesoft.com/applications/category.aspx?cid=194
en-us2015 Maplesoft, A Division of Waterloo Maple Inc.Maplesoft Document SystemFri, 22 May 2015 20:38:14 GMTFri, 22 May 2015 20:38:14 GMTNew applications in the Electrical categoryhttp://www.mapleprimes.com/images/mapleapps.gifElectrical: New Applications
http://www.maplesoft.com/applications/category.aspx?cid=194
Spectogram Examples
http://www.maplesoft.com/applications/view.aspx?SID=153571&ref=Feed
<p>A spectrogram illustrates how the constituent frequencies of a signal vary over time. This application generates the spectrogram of several audio files, including a</p>
<ul>
<li>DTMS tone,</li>
<li>human voice saying “MapleSim”, </li>
<li>violin note played with vibrato, and an entire violin scale,</li>
<li>C8 piano note,</li>
<li>series of dolphin clicks,</li>
<li>and more.</li>
</ul>
<p>Interestingly, some electronic musicians hide images in their music; you can only view these images with a spectrogram of the appropriate part of the audio. This includes the track “My Violent Heart” by the Nine Inch Nails; you can view this spectrogram in this application.</p>
<p>The Spectrogram() function was introduced in Maple 18, and also lets you plot the waveform and power spectrum. You can also control the precise color grading, and range of colors used to represent the strength of the frequency contents.</p><img src="/view.aspx?si=153571/spectograms.png" alt="Spectogram Examples" align="left"/><p>A spectrogram illustrates how the constituent frequencies of a signal vary over time. This application generates the spectrogram of several audio files, including a</p>
<ul>
<li>DTMS tone,</li>
<li>human voice saying “MapleSim”, </li>
<li>violin note played with vibrato, and an entire violin scale,</li>
<li>C8 piano note,</li>
<li>series of dolphin clicks,</li>
<li>and more.</li>
</ul>
<p>Interestingly, some electronic musicians hide images in their music; you can only view these images with a spectrogram of the appropriate part of the audio. This includes the track “My Violent Heart” by the Nine Inch Nails; you can view this spectrogram in this application.</p>
<p>The Spectrogram() function was introduced in Maple 18, and also lets you plot the waveform and power spectrum. You can also control the precise color grading, and range of colors used to represent the strength of the frequency contents.</p>153571Wed, 07 May 2014 04:00:00 ZSamir KhanSamir KhanSpectogram Generator
http://www.maplesoft.com/applications/view.aspx?SID=144590&ref=Feed
<p>This application lets you load wave files, apply windows and IIR/FIR filters, and view the spectrogram, power spectrum and waveform. You can also set filter cut-off frequencies by clicking on the power spectrum plot.</p><img src="/view.aspx?si=144590/spectogram_thumb.png" alt="Spectogram Generator" align="left"/><p>This application lets you load wave files, apply windows and IIR/FIR filters, and view the spectrogram, power spectrum and waveform. You can also set filter cut-off frequencies by clicking on the power spectrum plot.</p>144590Wed, 13 Mar 2013 04:00:00 ZSamir KhanSamir KhanFiltering Frequency Domain Noise
http://www.maplesoft.com/applications/view.aspx?SID=144593&ref=Feed
<p>This application demonstrates how you can filter low-power noise from the frequency domain representation of experimental data.</p><img src="/view.aspx?si=144593/10748a72d8047dfc094a9cdc7e3de5cd.gif" alt="Filtering Frequency Domain Noise" align="left"/><p>This application demonstrates how you can filter low-power noise from the frequency domain representation of experimental data.</p>144593Wed, 13 Mar 2013 04:00:00 ZMaplesoftMaplesoftControl Loop Compensation for Buck Converter
http://www.maplesoft.com/applications/view.aspx?SID=139253&ref=Feed
<p>Switch mode power supplies have been supplying most of the DC voltages that modern electronics need for operation. It is not unusual that a single piece of electronic equipment to have more than 10 or even 15 to 20 different voltages all at different currents. Power supply design engineers must have a good understanding of the stability requirements and be able to design the best fitting compensation circuit for the application.</p><img src="/view.aspx?si=139253/afb6e746c0d6b75320beb456bfa4d086.gif" alt="Control Loop Compensation for Buck Converter" align="left"/><p>Switch mode power supplies have been supplying most of the DC voltages that modern electronics need for operation. It is not unusual that a single piece of electronic equipment to have more than 10 or even 15 to 20 different voltages all at different currents. Power supply design engineers must have a good understanding of the stability requirements and be able to design the best fitting compensation circuit for the application.</p>139253Tue, 06 Nov 2012 05:00:00 ZAlan ElbanhawyAlan ElbanhawySyrup: Circuit Analysis Package
http://www.maplesoft.com/applications/view.aspx?SID=127001&ref=Feed
<p>This is an update to the old Syrup package for analyzing electric circuits with Maple. The new version now runs on Maple 15 and is easily installable (it uses a Maple installer). New features include an export to Modelica, so it can be used with MapleSim.</p><P>Updated version: 0.1.16</P><img src="/view.aspx?si=127001/circut_sm.jpg" alt="Syrup: Circuit Analysis Package" align="left"/><p>This is an update to the old Syrup package for analyzing electric circuits with Maple. The new version now runs on Maple 15 and is easily installable (it uses a Maple installer). New features include an export to Modelica, so it can be used with MapleSim.</p><P>Updated version: 0.1.16</P>127001Sun, 23 Oct 2011 04:00:00 ZJoseph RielJoseph RielAnalytical Magnetic Field Modeling of Slotless Permanent Magnet Synchronous Motors
http://www.maplesoft.com/applications/view.aspx?SID=120250&ref=Feed
<p>In this paper an analytical model for predicting the open-circuit magnetic field distribution in the air gap of iron-cored internal rotor with radial magnetization of surface mounted magnet and a slotless stator is presented. The model is extended to the prediction of the armature reaction field, back-emf and instantaneous torque produced by the 3-phase stator windings with fractional or integer slot per pole and per phase of iron-cored internal rotor. Analytical model can be adapted also for any type of windings. The results are in closed forms and provide a basis for comparative studies between existing permanent magnet (PM) machines and searching for new PM machines topologies. Predicted armature reaction field distribution, back-emf and instantaneous torque can be validated by comparing with corresponding finite element calculations.</p><img src="/applications/images/app_image_blank_lg.jpg" alt="Analytical Magnetic Field Modeling of Slotless Permanent Magnet Synchronous Motors" align="left"/><p>In this paper an analytical model for predicting the open-circuit magnetic field distribution in the air gap of iron-cored internal rotor with radial magnetization of surface mounted magnet and a slotless stator is presented. The model is extended to the prediction of the armature reaction field, back-emf and instantaneous torque produced by the 3-phase stator windings with fractional or integer slot per pole and per phase of iron-cored internal rotor. Analytical model can be adapted also for any type of windings. The results are in closed forms and provide a basis for comparative studies between existing permanent magnet (PM) machines and searching for new PM machines topologies. Predicted armature reaction field distribution, back-emf and instantaneous torque can be validated by comparing with corresponding finite element calculations.</p>120250Mon, 23 May 2011 04:00:00 ZDr. kamel BoughraraDr. kamel BoughraraCoded Excitation Signal Analysis
http://www.maplesoft.com/applications/view.aspx?SID=102645&ref=Feed
We examine several different options for a coded excitation scheme by investigating the autocorrelation of several functions.<img src="/view.aspx?si=102645/maple_icon.jpg" alt="Coded Excitation Signal Analysis" align="left"/>We examine several different options for a coded excitation scheme by investigating the autocorrelation of several functions.102645Fri, 18 Mar 2011 04:00:00 ZMaplesoftMaplesoftIdeal Y-Y Three-Phase Rectifier
http://www.maplesoft.com/applications/view.aspx?SID=35201&ref=Feed
<p>This is an ideal Y-Y connected three-phase rectifier. The primary and secondary sides of the transformer are both Y-connected with the star connector to establish ground. The three phases are then sent into the Universal Bridge subsystem, which consists of ideal diodes that perform full-wave rectification of the three phases. The load consists of a resistor and a capacitor. The capacitor filters the ripple present on V+ to provide the resistive load with a more stable voltage.</p><img src="/view.aspx?si=35201/YY.png" alt="Ideal Y-Y Three-Phase Rectifier" align="left"/><p>This is an ideal Y-Y connected three-phase rectifier. The primary and secondary sides of the transformer are both Y-connected with the star connector to establish ground. The three phases are then sent into the Universal Bridge subsystem, which consists of ideal diodes that perform full-wave rectification of the three phases. The load consists of a resistor and a capacitor. The capacitor filters the ripple present on V+ to provide the resistive load with a more stable voltage.</p>35201Mon, 22 Feb 2010 05:00:00 ZMaplesoftMaplesoftCalculation of B6 Bridge Losses of a power stage driven by space vector modulation scheme
http://www.maplesoft.com/applications/view.aspx?SID=33154&ref=Feed
<p>In many applications inverter fed electrical machines are used. In this paper the switching losses of an inverter with a B6 power stage built of IGBTs and freewheeling diodes are calculated.</p>
<p>First the power loss models for the IGBTs and the freewheeling diodes are defined. Then the switching times are determined by mathematically describing the space vector modulation scheme.</p>
<p>In part one the losses are calculated for one operating point to get the reader familiar with the calculation scheme.</p>
<p>in part two the formulation is more generic to perform the following calculations for a field of operating points. The surfaces of the losses are displayed depending on several input variables influencing the losses of the B6 power stage.</p><img src="/view.aspx?si=33154/0\images\B6-Bridge_losses_IGB_26.gif" alt="Calculation of B6 Bridge Losses of a power stage driven by space vector modulation scheme" align="left"/><p>In many applications inverter fed electrical machines are used. In this paper the switching losses of an inverter with a B6 power stage built of IGBTs and freewheeling diodes are calculated.</p>
<p>First the power loss models for the IGBTs and the freewheeling diodes are defined. Then the switching times are determined by mathematically describing the space vector modulation scheme.</p>
<p>In part one the losses are calculated for one operating point to get the reader familiar with the calculation scheme.</p>
<p>in part two the formulation is more generic to perform the following calculations for a field of operating points. The surfaces of the losses are displayed depending on several input variables influencing the losses of the B6 power stage.</p>33154Wed, 24 Jun 2009 04:00:00 ZAndreas SchrammAndreas SchrammThe Real Photovoltaic Solar Cell
http://www.maplesoft.com/applications/view.aspx?SID=33045&ref=Feed
<p>In this contribution, we use Maple software to study a solar cell modeled by an electronic circuit containing five physical parameters. The physical parameters are: the series resistance, the reverse saturation current, the ideality factor, the shunt resistance and the photocurrent. First, we solve the characteristic equation giving the output current <br />
as a function of the output voltage of the solar cell. Then, we determine the analytical expressions of the short circuit current, the open circuit voltage, the dynamical resistance <br />
of the solar cell and the different kinds of powers involved : the output power, the power dissipated by Joule Effect in the internal components of the solar cell and the solar cell total power.</p>
<p>Next, we determine a new expression of the optimal load resistance corresponding to the maximal power point. Finally, we investigate the effects of the different physical parameters on the current-voltage characteristic I[out] = f(V[out]) and on the output power P[out](I[out]) of the solar cell.</p><img src="/applications/images/app_image_blank_lg.jpg" alt="The Real Photovoltaic Solar Cell" align="left"/><p>In this contribution, we use Maple software to study a solar cell modeled by an electronic circuit containing five physical parameters. The physical parameters are: the series resistance, the reverse saturation current, the ideality factor, the shunt resistance and the photocurrent. First, we solve the characteristic equation giving the output current <br />
as a function of the output voltage of the solar cell. Then, we determine the analytical expressions of the short circuit current, the open circuit voltage, the dynamical resistance <br />
of the solar cell and the different kinds of powers involved : the output power, the power dissipated by Joule Effect in the internal components of the solar cell and the solar cell total power.</p>
<p>Next, we determine a new expression of the optimal load resistance corresponding to the maximal power point. Finally, we investigate the effects of the different physical parameters on the current-voltage characteristic I[out] = f(V[out]) and on the output power P[out](I[out]) of the solar cell.</p>33045Mon, 25 May 2009 04:00:00 ZProf. EL MAHDI ASSAIDProf. EL MAHDI ASSAIDAutomatic Equation Generation from a Lead Compensator Circuit
http://www.maplesoft.com/applications/view.aspx?SID=19164&ref=Feed
<p>This example shows the use of the Maple document environment for developing an analysis of an electric circuit, in this case, a lead compensator circuit that is converted to its governing equations, then converted to continuous and discrete transfer functions.</p><img src="/view.aspx?si=19164/Leadcomp-1.jpg" alt="Automatic Equation Generation from a Lead Compensator Circuit" align="left"/><p>This example shows the use of the Maple document environment for developing an analysis of an electric circuit, in this case, a lead compensator circuit that is converted to its governing equations, then converted to continuous and discrete transfer functions.</p>19164Wed, 25 Feb 2009 05:00:00 ZMaplesoftMaplesoftTwo-way Passive Crossover
http://www.maplesoft.com/applications/view.aspx?SID=19161&ref=Feed
<p>A crossover circuit is essentially a set of filters that directs signals of different frequency ranges to loudspeakers that have been designed to optimally handle those ranges. This two-way crossover circuit is typical for domestic applications, such as stereo speakers, where the lower frequencies (< 1 kHz) are sent to the larger "woofer" speaker and the high frequencies (>1 kHz) to the smaller "tweeter". This application was developed by Maplesoft’s Senior Architect, Stefan Vorkoetter, to help him with a hobby project to renovate a Hammond M-111 organ. <a href="http://www.stefanv.com/electronics/hammond_rotary.html">http://www.stefanv.com/electronics/hammond_rotary.html</a></p><img src="/view.aspx?si=19161/thumb.jpg" alt="Two-way Passive Crossover" align="left"/><p>A crossover circuit is essentially a set of filters that directs signals of different frequency ranges to loudspeakers that have been designed to optimally handle those ranges. This two-way crossover circuit is typical for domestic applications, such as stereo speakers, where the lower frequencies (< 1 kHz) are sent to the larger "woofer" speaker and the high frequencies (>1 kHz) to the smaller "tweeter". This application was developed by Maplesoft’s Senior Architect, Stefan Vorkoetter, to help him with a hobby project to renovate a Hammond M-111 organ. <a href="http://www.stefanv.com/electronics/hammond_rotary.html">http://www.stefanv.com/electronics/hammond_rotary.html</a></p>19161Tue, 24 Feb 2009 05:00:00 ZMaplesoftMaplesoftCylinder Heated by Induction
http://www.maplesoft.com/applications/view.aspx?SID=7240&ref=Feed
In this worksheet we consider a long metal cylinder that has a magnetic field applied parallel to the axis and a constraint on the current density at a particular depth. We demonstrate how the temperature depends on time and depth from the surface in a very long cylinder. This is calculated using the current density, the power density and the partial differential equation of heat conduction. In induction, the heating is caused by eddy currents, which themselves give rise to alternating magnetic fields. Because of the skin effect and depending on the frequency of the magnetic field, the highest current density exists directly under the surface of the heated work piece. It decreases rapidly with increasing depth. We calculate the effective magnetic field intensity on the surface required to reach a given temperature in a given time.<img src="/view.aspx?si=7240/A_Cylinder_heated_by_Induction_2009_2.gif" alt="Cylinder Heated by Induction" align="left"/>In this worksheet we consider a long metal cylinder that has a magnetic field applied parallel to the axis and a constraint on the current density at a particular depth. We demonstrate how the temperature depends on time and depth from the surface in a very long cylinder. This is calculated using the current density, the power density and the partial differential equation of heat conduction. In induction, the heating is caused by eddy currents, which themselves give rise to alternating magnetic fields. Because of the skin effect and depending on the frequency of the magnetic field, the highest current density exists directly under the surface of the heated work piece. It decreases rapidly with increasing depth. We calculate the effective magnetic field intensity on the surface required to reach a given temperature in a given time.7240Wed, 11 Feb 2009 00:00:00 ZMaplesoftMaplesoftClassroom Tips and Techniques: Electric Field from Distributed Charge
http://www.maplesoft.com/applications/view.aspx?SID=7217&ref=Feed
The electric field from a constant line charge of finite length is computed in both the VectorCalculus and Physics packages. A field plot along with field lines is also obtained.<img src="/view.aspx?si=7217/1.jpg" alt="Classroom Tips and Techniques: Electric Field from Distributed Charge" align="left"/>The electric field from a constant line charge of finite length is computed in both the VectorCalculus and Physics packages. A field plot along with field lines is also obtained.7217Mon, 09 Feb 2009 00:00:00 ZDr. Robert LopezDr. Robert LopezA simple RC low-pass filter
http://www.maplesoft.com/applications/view.aspx?SID=7175&ref=Feed
A simple low pass filter that can be expanded to derive the higher order filters illustrated in the application note:
A Filter Primer, AN733, from Maxim Integrated Circuits.<img src="/view.aspx?si=7175/1.jpg" alt="A simple RC low-pass filter" align="left"/>A simple low pass filter that can be expanded to derive the higher order filters illustrated in the application note:
A Filter Primer, AN733, from Maxim Integrated Circuits.7175Wed, 28 Jan 2009 00:00:00 ZGeorgios KokovidisGeorgios KokovidisPlotting Capabilities for Engineers
http://www.maplesoft.com/applications/view.aspx?SID=6979&ref=Feed
Maple contains an extensive set of visualization tools and options, including many plots and options commonly used by engineers. This Tips & Techniques document demonstrates how to create and customize your plots using interactive techniques and command options, with emphasis on options used in engineering contexts.<img src="/view.aspx?si=6979/thumb.gif" alt="Plotting Capabilities for Engineers" align="left"/>Maple contains an extensive set of visualization tools and options, including many plots and options commonly used by engineers. This Tips & Techniques document demonstrates how to create and customize your plots using interactive techniques and command options, with emphasis on options used in engineering contexts.6979Thu, 04 Dec 2008 04:00:00 ZMaplesoftMaplesoftOptimal Control Design of a Voice Coil Actuator Head in a Hard Drive
http://www.maplesoft.com/applications/view.aspx?SID=6877&ref=Feed
<p>This document examines the steps involved in quickly and accurately controlling the position of the voice coil actuator head. The design of the closed-loop system, including the approach used to investigate the dynamics of the plant model and design the mathematical model of the controller, will be explained in detail.</p><img src="/view.aspx?si=6877/thumb.jpg" alt="Optimal Control Design of a Voice Coil Actuator Head in a Hard Drive" align="left"/><p>This document examines the steps involved in quickly and accurately controlling the position of the voice coil actuator head. The design of the closed-loop system, including the approach used to investigate the dynamics of the plant model and design the mathematical model of the controller, will be explained in detail.</p>6877Sun, 09 Nov 2008 05:00:00 ZMaplesoftMaplesoftModeling the Dynamics of an Ice Tank
http://www.maplesoft.com/applications/view.aspx?SID=6659&ref=Feed
<p>This document presents the steps involved in developing an accurate model of the ice tank carriage. In addition, it illustrates the approach that was taken to eliminate chatter in the gearbox, due to backlash between the gear teeth.</p><img src="/view.aspx?si=6659/thumb.jpg" alt="Modeling the Dynamics of an Ice Tank" align="left"/><p>This document presents the steps involved in developing an accurate model of the ice tank carriage. In addition, it illustrates the approach that was taken to eliminate chatter in the gearbox, due to backlash between the gear teeth.</p>6659Sun, 14 Sep 2008 04:00:00 ZDigital Filter Design
http://www.maplesoft.com/applications/view.aspx?SID=1459&ref=Feed
A FIR filter is derived from the impulse response of the desired filter and then sampled to convert it to a discrete time filter. The infinitely long impulse response must be truncated to be implemented. If the impulse response is nonzero for negative time (the filter is anti-causal) the response must also be shifted to the right until all of the impulse response coefficients are located in the positive time region.<img src="/view.aspx?si=1459/thumb.jpg" alt="Digital Filter Design" align="left"/>A FIR filter is derived from the impulse response of the desired filter and then sampled to convert it to a discrete time filter. The infinitely long impulse response must be truncated to be implemented. If the impulse response is nonzero for negative time (the filter is anti-causal) the response must also be shifted to the right until all of the impulse response coefficients are located in the positive time region.1459Tue, 06 May 2008 00:00:00 ZMaplesoftMaplesoftHarmonic Oscillator
http://www.maplesoft.com/applications/view.aspx?SID=1462&ref=Feed
This application illustrates a second order harmonic oscillator under different control strategies. The proportional (P), proportional-integral (PI), and proportional-integral-derivative (PID) controller structures are shown.<img src="/view.aspx?si=1462/thumb.gif" alt="Harmonic Oscillator" align="left"/>This application illustrates a second order harmonic oscillator under different control strategies. The proportional (P), proportional-integral (PI), and proportional-integral-derivative (PID) controller structures are shown.1462Tue, 06 May 2008 00:00:00 ZMaplesoftMaplesoft