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Embedded Software and Motor Control Libraries for PXR40xx

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Function GMCLIB_SvmStd_FLT<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 three<br />

auxiliary variables:<br />

Equation GMCLIB_SvmStd_Eq19<br />

Equation GMCLIB_SvmStd_Eq20<br />

Equation GMCLIB_SvmStd_Eq21<br />

To simplify the calculation, two expressions, t_1 <strong>and</strong> t_2, are introduced. These<br />

expressions represent duty-cycle ratios of the basic space vectors in the respective sector;<br />

e.g., <strong>for</strong> the first sector, t_1 <strong>and</strong> t_2 represent duty-cycle ratios of the basic space vectors<br />

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

space vectors U 120 <strong>and</strong> U 60, etc.<br />

For each sector, the relation between the t_1 <strong>and</strong> t_2 <strong>and</strong> variables X<br />

(GMCLIB_SvmStd_Eq19), Y (GMCLIB_SvmStd_Eq20) <strong>and</strong> Z<br />

(GMCLIB_SvmStd_Eq21), are listed in Table 4-150.<br />

Table 4-150. 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 />

Table continues on the next page...<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 />

536 Freescale Semiconductor, Inc.

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