AN1948_D Freescale Semiconductor / Motorola, AN1948_D Datasheet - Page 7

• Manufacturer Part Number: AN1948_D
• Description: Real Time Development of MC Applications using the PC Master Software Visualization Tool
• Manufacturer: Freescale Semiconductor / Motorola

MOTOROLA
The Recorder enables the observation and reconstruction of the phase current measured by the ADC.
The Recorder “read” command is inserted into the ADC conversion completed interrupt routine,
recording the result of the ADC measurement and phase current reconstruction. When the desired
period is complete the measured profiles can be visualized on the Recorder window.
illustrates the visualized current profiles of a 3-Phase SR motor and the DC-Bus voltage on the
Recorder.
Each Recorder window can display up to eight recorded profiles. This is extremely important when
developing control algorithms for multi-phase motors. The start of the recording can also be triggered
by a selected variable, so the desired interval can be recorded. It can be used, e.g., when investigating
the profiles of measured variables during motor start-up or speed/load transition. Next, the recorded
data can be loaded into a table processor, like MS Excel, for further evaluation.
+ DC Bus Voltage
GND
PWM_T1
PWM_T2
D2
T1
R_sense
Real Time Development using the PC Master Software
Phase A
Figure 4-1. Shunt Resistors Current Sensors
Freescale Semiconductor, Inc.
For More Information On This Product,
sense
sense
D1
T2
Development of Motor Control Applications Using PC Master Software
Go to: www.freescale.com
ADC
.
Bottom
Switch
Switch
(T2)
(T1)
Top
0
0
(synchronized with PWM)
ADC Sampling
Figure 4-2
Time
Time
Time
Time
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