AN1627 Freescale Semiconductor / Motorola, AN1627 Datasheet - Page 24

• Manufacturer Part Number: AN1627
• Description: Low Cost High Efficiency Sensorless Drive for Brushless dc Motor Using MC68HC (7)05MC4
• Manufacturer: Freescale Semiconductor / Motorola

A.1
During the development it was important to find out if the power devices are suited for the application.
Therefore a 30min test was performed. The temperature of the devices was checked to be within the
range allowed by the manufacturer (105°C).
The gate resistance was 22Ohm. All IGBT’s were in an upright position without heatsink and the
temperature was measured on the central pin. The following table summarizes the obtained results. The
maximal temperature does not exceed the allowed limit and the devices passed the test.
A typical oscillogram of the phase current (Ch1; 1A/10mV), the branch voltage (Ch3) and one half of
the DC-Bus voltage (Ch2) waveforms (Ch2 and Ch3 are divided by resistor network) was taken during
the test. In the points where the channel 3 is crossing the channel 2, the Zero Crossing points are
MOTOROLA
24
Ambient temperature
Device: MGP4N60ED TO220
PWM frequency
DC-Bus voltage
Power Stage Board
Motor speed
Load torque
Settings
Freescale Semiconductor, Inc.
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0.97Nm
1002RPM
305.5V
3.9kHz
23°C
MEASURED RESULTS
Figure 1.
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APPENDIX A
Copack
Measured waveforms
Max.temperature during 30min test
Temperature at the start of the test
Temperature at the end of the test
Table 1.
Motor phase current
Results
1.13A mean
1.36A RMS
2.14A peak
30.8°C
80.0°C
81.1°C
REV 0.2
AN1627