Andreas Schramm: New Applications
http://www.maplesoft.com/applications/author.aspx?mid=68179
en-us2014 Maplesoft, A Division of Waterloo Maple Inc.Maplesoft Document SystemThu, 17 Apr 2014 07:12:44 GMTThu, 17 Apr 2014 07:12:44 GMTNew applications published by Andreas Schrammhttp://www.mapleprimes.com/images/mapleapps.gifAndreas Schramm: New Applications
http://www.maplesoft.com/applications/author.aspx?mid=68179
Calculation 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 SchrammCalculation instruction for the Frobenius decomposition with more than one input variable and their transfer functions
http://www.maplesoft.com/applications/view.aspx?SID=6463&ref=Feed
In several books on control theory (e.g. Föllinger: "Regelungstechnik") the Frobenius decomposition is described as a method for determining the state space model out of the Laplacian form of the transfer function. In those books it is described for one input variable U(s) and its transfer function G(s).The following calculation instruction is evolved to fractionize a transfer function with the sum of two input variables and their transfer functions into state space.<img src="/view.aspx?si=6463/1.jpg" alt="Calculation instruction for the Frobenius decomposition with more than one input variable and their transfer functions" align="left"/>In several books on control theory (e.g. Föllinger: "Regelungstechnik") the Frobenius decomposition is described as a method for determining the state space model out of the Laplacian form of the transfer function. In those books it is described for one input variable U(s) and its transfer function G(s).The following calculation instruction is evolved to fractionize a transfer function with the sum of two input variables and their transfer functions into state space.6463Wed, 16 Jul 2008 04:00:00 ZAndreas SchrammAndreas Schramm3D spline interpolation
http://www.maplesoft.com/applications/view.aspx?SID=5644&ref=Feed
This worksheet gives an example of how to use the Maple spline function to create a 3 dimensional spline surface and a function R^2->R, based on discrete values given with respect to their axes in a matrix with the first row containing the x-values and the first column containing the y-values.<img src="/applications/images/app_image_blank_lg.jpg" alt="3D spline interpolation" align="left"/>This worksheet gives an example of how to use the Maple spline function to create a 3 dimensional spline surface and a function R^2->R, based on discrete values given with respect to their axes in a matrix with the first row containing the x-values and the first column containing the y-values.5644Tue, 05 Feb 2008 05:00:00 ZAndreas SchrammAndreas Schramm