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Embedded Software and Motor Control Libraries for PXR40xx

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Function GMCLIB_SvmStd_F32<br />

Equation GMCLIB_SvmStd_Eq18<br />

The duty-cycle ratios in remaining sectors can be derived using the same approach. The<br />

resulting equations will be similar to those derived <strong>for</strong> Sector I <strong>and</strong> Sector II.<br />

To depict duty-cycle ratios of the basic space vectors <strong>for</strong> all sectors, we define:<br />

• Three auxiliary variables:<br />

Equation GMCLIB_SvmStd_Eq19<br />

Equation GMCLIB_SvmStd_Eq20<br />

Equation GMCLIB_SvmStd_Eq21<br />

Two expressions t_1 <strong>and</strong> t_2 generally represent duty-cycle ratios of the basic space<br />

vectors in the respective sector; e.g., <strong>for</strong> the first sector, t_1 <strong>and</strong> t_2 represent duty-cycle<br />

ratios of the basic space vectors U 60 <strong>and</strong> U 0; <strong>for</strong> the second sector, t_1 <strong>and</strong> t_2 represent<br />

duty-cycle ratios of the basic space vectors U 120 <strong>and</strong> U 60, etc.<br />

For each sector, the expressions t_1 <strong>and</strong> t_2, in terms of auxiliary variables X, Y <strong>and</strong> Z,<br />

are listed in Table 4-140.<br />

Table 4-140. Determination of t_1 <strong>and</strong> t_2 expressions<br />

Sector U 0, U 60 U 60, U 120 U 120, U 180 U 180, U 240 U 240, U 300 U 300, U 0<br />

t_1 X Y -Y Z -Z -X<br />

t_2 -Z Z X -X -Y Y<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 />

508 Freescale Semiconductor, Inc.

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