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Embedded Software and Motor Control Libraries for PXR40xx

Embedded Software and Motor Control Libraries for PXR40xx

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For the determination of auxiliary variables X equation GMCLIB_SvmStd_Eq19, Y<br />

equation GMCLIB_SvmStd_Eq20 <strong>and</strong> Z equation GMCLIB_SvmStd_Eq21, the sector<br />

number is required. This in<strong>for</strong>mation can be obtained by several approaches. One<br />

approach discussed here requires the use of a modified Inverse Clark Trans<strong>for</strong>mation to<br />

trans<strong>for</strong>m the direct- α <strong>and</strong> quadrature- components into a balanced three-phase quantity<br />

u ref1, u ref2 <strong>and</strong> u ref3, used <strong>for</strong> a straight<strong>for</strong>ward calculation of the sector number, to be<br />

shown later.<br />

Equation GMCLIB_SvmStd_Eq22<br />

Equation GMCLIB_SvmStd_Eq23<br />

Equation GMCLIB_SvmStd_Eq24<br />

Chapter 4 API References<br />

The modified Inverse Clark Trans<strong>for</strong>mation projects the quadrature-u β component into u<br />

ref1, as shown in Figure 4-55 <strong>and</strong> Figure 4-56, whereas voltages generated by the<br />

conventional Inverse Clark Trans<strong>for</strong>mation project the u α component into u ref1.<br />

Figure 4-55. Direct-ua <strong>and</strong> quadrature-ub components of stator reference voltage<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 />

Freescale Semiconductor, Inc. 509

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