03.08.2013 Views

Embedded Software and Motor Control Libraries for PXS20xx

Embedded Software and Motor Control Libraries for PXS20xx

Embedded Software and Motor Control Libraries for PXS20xx

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Equation GMCLIB_SvmStd_Eq11 <strong>and</strong> equation GMCLIB_SvmStd_Eq12 have been<br />

<strong>for</strong>med using the sine rule. These equations can be rearranged <strong>for</strong> the calculation of the<br />

auxiliary time-duration components A <strong>and</strong> B. This is done simply by substitution of the<br />

trigonometric terms sin(30 °), sin(120 °) <strong>and</strong> sin(60 °) by their numerical representations<br />

1/2, √(3)/2 <strong>and</strong> 1/ √(3), respectively.<br />

Equation GMCLIB_SvmStd_Eq13<br />

Equation GMCLIB_SvmStd_Eq14<br />

The resultant duty-cycle ratios, T 120/T <strong>and</strong> T 60/T, are then expressed in terms of the<br />

auxiliary time-duration components defined by equation GMCLIB_SvmStd_Eq13 <strong>and</strong><br />

equation GMCLIB_SvmStd_Eq14, as follows:<br />

Equation GMCLIB_SvmStd_Eq15<br />

Equation GMCLIB_SvmStd_Eq16<br />

With the help of these equations, <strong>and</strong> also considering the normalized magnitudes of the<br />

basic space vectors to be |U 120| = |U 60| = 2/ (3), the equations expressed <strong>for</strong> the unknown<br />

duty-cycle ratios of basic space vectors T 120/T <strong>and</strong> T 60/T can be written:<br />

Equation GMCLIB_SvmStd_Eq17<br />

<strong>Embedded</strong> <strong>Software</strong> <strong>and</strong> <strong>Motor</strong> <strong>Control</strong> <strong>Libraries</strong> <strong>for</strong> <strong>PXS20xx</strong>, Rev. 1.0<br />

Chapter 4 API References<br />

Freescale Semiconductor, Inc. 521

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!