This document discusses ways to optimize drive systems for efficiency using frequency inverters and motors from NORD Drivesystems. It describes how frequency inverters can increase total system efficiency compared to operating motors at constant speed. Using an inverter introduces some losses of around 5% but it also allows optimizing the motor's magnetic field to increase part-load efficiency. The document also discusses using regenerative feedback units to recover energy from deceleration and send it back to the mains, further improving efficiency. DC coupling of inverter outputs and intelligent control strategies are presented as additional ways to optimize energy usage across multiple drives.

1. 22.02.20191
Speaker :
:
Date:
NORD DRIVESYSTEMS

2. 22.02.20192
Part load situation without inverter use
NORD
PM-Motor
ASM – EFF1
ASM – EFF2
ASM – EFF3

3. 22.02.20193
Usage of Frequency Inverter
NORD
 Losses of inverter ca. 5%:
ca. 15 W internal (power supply unit (depending of options),
ca. 5% losses in rectifier and power module
(depending of pulse frequency and motor cable lenght)
 Total efficiency rate = Product of individual efficiency rates
Frequency inverter x Motor x Gear
e.g. 0,95 * 0,853 * 0,97 = 0,786

4. 22.02.20194
Usage of Frequency Inverter
NORD
 ca. + 4% Increase of total efficiency with 87Hz-characteristic
 But notice efficiency of gear (friction, oill-losses, gear stage…)
74
75
76
77
78
79
80
0 50 100 150
eta/%
f/Hz
eta/%
e…
0
50
100
150
200
250
300
350
0 50 100 150
Pv/W
f/Hz
Pvcu1/W
Pvcu2/W
Pvfe/W
Pvrbg{W
PvLüft/W
Pvzus/W
Example 90S/4

5. 22.02.20195
P219 Automatic magnetisation adjustment
NORD
 Increae of efficiency in part load situation by adjustment of magnetic
field by NORD FU
Part load with
adjustment of
magnetization
Full load Part load

6. 22.02.20196
P219 Automatic magnetisation adjustment
NORD
Efficinecy depending of torque with/without energy saving
function at 10 Hz
30
35
40
45
50
55
60
65
70
75
10 20 30 40 50 60 70 80
M/Mn [%]
Eff[%]
Eff with P219 = 100%
Eff with P219 = 25%

7. 22.02.20197
Usage of Frequency Inverter
NORD
Efficiency dep. Of torquewith/without energy saving function
at 50Hz
30
40
50
60
70
80
90
10 20 30 40 50 60 70 80
M/Mn [%]
Eff[%]
Eff with P219 = 100%
Eff with P219 = 25%

8. 22.02.20198
Usage of Frequency Inverter
NORD
 Energy exchange by DC-coupling of inverter dc-circuits
 Energy feedback to main with big regenerative powers
(centrifugal, hoists, ...)
 Energy saving by intelligent and stepless regulation
concepts of the application,
Avoiding peak loads,
Reduction of overdimensions, ...
 Here is a huge potential of energy saving !

9. 22.02.20199
DC-Link coupling
NORD
 DC coupling of inverter:
 Possible with 500E, 700E (not
with 300E, 200E, no access to DC
link)
 DC-link cable as short as
possible
 DC-link connection after inverter
are in ready status
 Drives of same sizes can be
installed without In-chokes

10. 22.02.201910
Regenerative Feedback unit Elektroplan Revcon
NORD
Choice of regenerative feedback unit:
- Hoist, Centrifuge etc. (acc. And decel.
In change)
=> REVCON SVC
- Motor test stand etc. (permanent
negative torque)
=> REVCON SVCD (D = permanent)
 Peak power = power of SVC (50%
duty)
 Permanent power = power of
SVCD (100% duty)
PE
Controller
FU
REVCON SVC...(type)
(choke-included)
radio inter-
ference filter
L1 L2 L3
M
3 ~
PE U V W
+ +
- -
L1 L2 L3 PEL11 N
control
7 8 9 10 11 12X2
relay
X2 2 1 4 3
Error operation
Regler-+24 V
+
-
ext.
OFF
ext. ON
RESET
ext. ON
RESET
7
4
6
3
1
5
8
PE
L1
N
L2
L3
230V
L1
N
V WU
SKS-module
2
5

11. 22.02.201911
Regenerative Feedback unit Elektroplan Revcon
NORD
No settings or programming required.
Available power from 4…400kW
For main voltages of 230V, 400V, 500V
and 690V
Integrated overload protection

12. 22.02.201912
Need to Optimize Drive Systems
NORD

13. 22.02.201913
Need to Optimize Drive Systems
NORD

14. 22.02.201914
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