Cell Loss Calculations; Rectifier Losses Vs Output Current - Siemens Vendor Manual

Application Notes

9.5 Cell Loss Calculations

The most accurate and quickest way to calculate cell losses is to use Drive Calc Express. However, losses can be
estimated using the tables, equations, and plots below. Cell losses consist of the following: rectifier, capacitor,
bleeder resistor, IGBT, FWD, control, bus work, and power plugs.
9.5.1

Rectifier Losses vs Output Current

The table and charts below can be used for estimating individual input rectifier losses as a function of cell output
current. All 40-140A cells use the same DD106N1800 rectifier modules. All 200-260A cells use the same
DD171N1800 rectifier modules. For total rectifier losses per cell, multiply the numbers below by 6.
Iout 40-140A
25 4.83
50 10.21
75 16.14
100 22.62
125 29.64
150 37.22
175 45.34
200 54.02
225 63.24
250 73.01
275 83.33
300 94.20
9
325 105.61
350 117.58
375 130.09
400 143.16
425 156.77
450 170.93
475 185.64
500 200.90
Alternatively, individual rectifier losses can be estimated as follows:
40-140A cells: Prect = 0.000439 x Iout ^2 + 0.1823 x Iout - 0.00244
200-260A cells: Prect = 0.000286 x Iout ^2 + 0.1958 x Iout + 0.03017
0.85 motor power factor, 0.95 motor efficiency, 105% modulation, Iin=0.7 x Iout, and DD106N1800 or
DD171N1800 dual rectifier modules are assumed.
9-6
200-260A
Losses vs Output Current
225
5.10
10.54
16.32
200
22.47
28.97
175
35.83
43.05
150
50.62
58.55
125
66.84
75.48
84.48
100
93.84
103.55
75
113.63
124.05
50
134.84
145.98
25
157.48
169.34
0
s
MicroHarmony Cell Sizes 40 - 260A Manual
40-140A
Output Current, Arms
19001467: Version 1.0
200-260A