AN1931D Freescale Semiconductor / Motorola, AN1931D Datasheet - Page 26
AN1931D
Manufacturer Part Number
AN1931D
Description
3-Phase PM Synchronous Motor Vector Control
Manufacturer
Freescale Semiconductor / Motorola
Datasheet
1.AN1931D.pdf
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System Concept
26
A decision must now be made about which phase current should be calculated. The simplest technique
is to calculate the current of the most positive voltage phase. For example, Phase A generates the most
positive voltage within section 0 - 60
In this case, the output voltages are divided into six sectors, as shown in
calculation is then made according to the actual sector value.
Sectors 1 and 6:
PHASE_B
PHASE_A
PHASE_C
Figure 4-11. 3-phase Sinewave Voltages and Corresponding Sector Value
Figure 4-10. Voltage Shapes of Two Different PWM Periods
Freescale Semiconductor, Inc.
6HFWRU 6HFWRU 6HFWRU 6HFWRU 6HFWRU 6HFWRU
6HFWRU 6HFWRU 6HFWRU 6HFWRU 6HFWRU 6HFWRU
3-Phase PM Synchronous Motor Vector Control
For More Information On This Product,
PWM PERIOD
II.
ADC sampling point
I.
I.
Go to: www.freescale.com
i
A
=
–
i
B
–
i
C
PWM RELOAD
critical pulse width
QuhrÃ6
QuhrÃ6
QuhrÃ6
QuhrÃ7
QuhrÃ7
QuhrÃ7
QuhrÃ8
QuhrÃ8
QuhrÃ8
II.
DQJOH
DQJOH
Figure
4-11. The current
Figure 4-11
MOTOROLA
(EQ 4-5.)
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