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Embedded Software and Motor Control Libraries for PXR40xx

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Function GMCLIB_SvmStd_F16<br />

In this case, the reference stator voltage vector U S is located in Sector I <strong>and</strong>, as<br />

previously mentioned, can be generated with the appropriate duty-cycle ratios of the<br />

basic switching states U 60 <strong>and</strong> U 0. The principal equations concerning this vector<br />

location are:<br />

Equation GMCLIB_SvmStd_Eq3<br />

Equation GMCLIB_SvmStd_Eq4<br />

where T 60 <strong>and</strong> T 0 are the respective duty-cycle ratios <strong>for</strong> which the basic space vectors<br />

U 60 <strong>and</strong> U 0 should be applied within the time period T. T null is the course of time <strong>for</strong><br />

which the null vectors O 000 <strong>and</strong> O 111 are applied. Those duty-cycle ratios can be<br />

calculated using equations:<br />

Equation GMCLIB_SvmStd_Eq5<br />

Equation GMCLIB_SvmStd_Eq6<br />

Considering that the normalized magnitudes of the basic space vectors are |U 60| = |U 0| =<br />

2/ √(3) <strong>and</strong> by substitution of the trigonometric expressions sin(60 °) <strong>and</strong> tan(60 °) by<br />

their quantities 2/ √(3) <strong>and</strong> √(3), respectively, equation GMCLIB_SvmStd_Eq5 <strong>and</strong><br />

equation GMCLIB_SvmStd_Eq6 can be rearranged <strong>for</strong> the unknown duty-cycle ratios T<br />

60/T <strong>and</strong> T 0/T:<br />

<strong>Embedded</strong> <strong>Software</strong> <strong>and</strong> <strong>Motor</strong> <strong>Control</strong> <strong>Libraries</strong> <strong>for</strong> <strong>PXR40xx</strong>, Rev. 1.0<br />

518 Freescale Semiconductor, Inc.

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