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Embedded Software and Motor Control Libraries for PXR40xx

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Function GMCLIB_SvmStd_FLT<br />

4.114.3 Return<br />

The function returns a 32-bit value in <strong>for</strong>mat INT, representing the actual space sector<br />

which contains the stator reference vector U s.<br />

4.114.4 Description<br />

The GMCLIB_SvmStd_FLT function <strong>for</strong> calculating duty-cycle ratios is widely-used in<br />

the modern electric drive. This function calculates appropriate duty-cycle ratios, which<br />

are needed <strong>for</strong> generating the given stator reference voltage vector using a special Space<br />

Vector Modulation technique, termed St<strong>and</strong>ard Space Vector Modulation.<br />

Figure 4-69. Power stage schematic diagram<br />

Top <strong>and</strong> bottom switches work in a complementary mode; i.e., if the top switch (S At) is<br />

ON, then the corresponding bottom switch (S Ab) is OFF, <strong>and</strong> vice versa. Considering<br />

that value 1 is assigned to the ON state of the top switch, <strong>and</strong> value 0 is assigned to the<br />

ON state of the bottom switch, the switching vector, [a, b, c] T can be defined. Creating<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 />

528 Freescale Semiconductor, Inc.

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