User guide
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Revision 1.4
2021-09-10
EVAL-M1-IM818-A user guide
Evaluation power board with MADK M1 connector
System performance
4.3
Test results of typical waveform
Figure 32 is typical current waveform of a sinusoidal brushless motor driven by the EVAL-M1-IM818-A and EVAL-
M1-101T with iMOTIONTM software.
Figure 32
I
U
and I
V
current waveform. It is IM818-MCC work on AC380V input, PWM=6kHz, motor drive on
700rpm, Iphase=5A
Figure 33 is IPM typical switching dv/dt on “ON” and “OFF” time.
5 V/ns in switcing “ON” 5 V/ns in switching “OFF”
Figure 33
Typical dv/dt test waveform. It is IM818-MCC work on 380 V
AC
input at switching current is 2A.
The dv/dt is very important parameter for motor drive. This is specially set for the application.
The cable connecting the motor can be regarded as an open inductor, which forms a complete electromagnetic
radiation network with the capacitance of the motor winding to the ground. The parasitic combination emits
high-frequency electromagnetic noise to the surroundings, if there is an excitation source.
