AN1911 Freescale Semiconductor / Motorola, AN1911 Datasheet - Page 11

• Manufacturer Part Number: AN1911
• Description: 3-Phase AC Motor Control with V/Hz Speed Open Loop Using DSP56F80X
• Manufacturer: Freescale Semiconductor / Motorola

6.
6.1 Data Flow
(OverVoltage/OverCurrent)
Temperature
Temperature
This section describes the design of the software blocks of the drive. The software will be described in
terms of Data Flow and State Diagrams.
The requirements of the drive dictate that software gathers some values from the user interface and
sensors, processes them and generates 3-phase PWM signals for the inverter.
The control algorithm of open loop AC drive is described in
described in the following sub-sections. The detailed description is given to the subroutines 3-phase
PWM calculation and Volt per Hertz control algorithm.
PWM Faults
(A/D)
Software Design
Fault Control
DriveFaultStatus
DC-Bus Voltage
u_dc_bus
(A/D)
Indirect Power Factor Correction Using DSP56F80X
Freescale Semiconductor, Inc.
For More Information On This Product,
Acceleration/Deceleration Ramp
DC-Bus Voltage Ripple Elimination
MASTER
Go to: www.freescale.com
Figure 6-1. Data Flow
Omega_desired
PC
AmplitudeVoltScale
Omega_required
PVAL0
V/Hz Ramp
Amplitude
SETTING
SPEED
PWM Generation
PVAL2
Figure
6-1. It contains the processes
Omega_measured
Speed Measurement
INCREMENTAL
ENCODER
PC_Master
PVAL4
Software Design
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