AN1915D Freescale Semiconductor / Motorola, AN1915D Datasheet - Page 11

• Manufacturer Part Number: AN1915D
• Description: 3-Phase BLDC Motor Control with Quadrature Encoder using DSP56F80x
• Manufacturer: Freescale Semiconductor / Motorola

Freescale Semiconductor, Inc.
Target Motor Theory
Figure 3-11. Situation Prior to First Compare Following Alignment
As soon as the counter reaches one of the compare values, the commutation interrupt is called. The
commutation interrupt recognizes the spin direction and sets new values into compare registers. The
new values corresponds to the next commutation sector in clockwise or counter clockwise direction
according to actual spin direction. Then the control word, which saves the actual commutation sector,
is updated and the new voltage pattern is applied to the motor. The corresponding voltage pattern is
taken from
Table 3-2
and
Table
3-2.
Figure 3-12
depicts the new situation after commutation.
Figure 3-12. Situation Following Commutation
MOTOROLA
3-Phase BLDC Motor Control with Quadrature Encoder
11
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