AN1914 Freescale Semiconductor / Motorola, AN1914 Datasheet - Page 44

• Manufacturer Part Number: AN1914
• Description: 3-Phase BLDC Motor Control with Sensorless Back EMF Zero Crossing Detection Using DSP56F80x
• Manufacturer: Freescale Semiconductor / Motorola

SW Design
7.3.5 State Diagram - Process Speed PI Controller
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The Speed PI controller algorithm controllerPItype1 is described in the SDK documentation. The
controller execution (sampling) period is PER_SPEED_SAMPLE, period of Speed Control Timer
Interrupt.
Speed Control
PI (Reference Speed - Actual Motor Speed)
Request
Figure 7-9. State Diagram - Process Speed PI Controller
DSP56F80x MC PWM Module in Motor Control Applications
U_Desired =
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Stopped/Alignment/Starting
Set Speed Control
Commutation
Request
Running
Commutation
(PER_SPEED_SAMPLE)
Timer Interrupt
Speed Control
Speed Control
Disabled
Reset