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Embedded Software and Motor Control Libraries for PXR40xx

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Figure 4-50. Basic space vectors<br />

These states, together with the resulting instantaneous output line-to-line <strong>and</strong> phase<br />

voltages, are listed in Table 4-138.<br />

Table 4-138. Switching patterns<br />

a b c U a U b U c U AB U BC U CA Vector<br />

0 0 0 0 0 0 0 0 0 O 000<br />

1 0 0 2/3*U<br />

DCBus<br />

1 1 0 1/3*U<br />

DCBus<br />

0 1 0 -1/3*U<br />

DCBus<br />

0 1 1 -2/3*U<br />

DCBus<br />

0 0 1 -1/3*U<br />

DCBus<br />

1 0 1 1/3*U<br />

DCBus<br />

-1/3*U<br />

DCBus<br />

1/3*U<br />

DCBus<br />

2/3*U<br />

DCBus<br />

1/3*U<br />

DCBus<br />

-1/3*U<br />

DCBus<br />

-2/3*U<br />

DCBus<br />

-1/3*U<br />

DCBus<br />

-2/3*U<br />

DCBus<br />

-1/3*U<br />

DCBus<br />

1/3*U<br />

DCBus<br />

2/3*U<br />

DCBus<br />

1/3*U<br />

DCBus<br />

Chapter 4 API References<br />

U DCBus 0 -U DCBus U 0<br />

0 U DCBus -U DCBus U 60<br />

-U DCBus U DCBus 0 U 120<br />

-U DCBus 0 U DCBus U 240<br />

0 -U DCBus U DCBus U 300<br />

U DCBus -U DCBus 0 U 360<br />

1 1 1 0 0 0 0 0 0 O 111<br />

The quantities of the direct-u α <strong>and</strong> the quadrature-u β components of the two-phase<br />

orthogonal coordinate system, describing the three-phase stator voltages, are expressed<br />

by the Clarke Trans<strong>for</strong>mation.<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. 501

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