Lenze 9400 Manual do Utilizador descarregar pdf (Página 206)

5 Motor interface

5.8 Parameterisable additional functions

206

Lenze · Servo-Inverter 9400 HighLine · Reference manual · DMS 10.0 EN · 11/2013 · TD05/06

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5.8.2 Field weakening for synchronous machines

This function is available from software version V2.0!

If required, the field weakening mode can be switched on in C00093

for synchronous machines.

[5-28] Voltage/speed characteristic with switched-on field weakening

[5-29] Calculation of the maximally reachable speed with switched-on field weakening

[5-30] Speed/torque characteristics of a synchronous servo motor with field weakening

 Note!

Function only possible for servo control!

 Armature control range

 Field weakening range

• When field weakening is switched on, the motor

magnetising current is increased from 0 A to the maximally

effective magnetising current via an internal control loop

when the voltage limit is reached.

• As a result, a higher speed can be reached at the same

motor voltage or DC-bus voltage.

n





U

motor

n

max

n

rated_mot

800V

2U

rated_mot

⋅

--------------------------------------

⋅=

 Standstill torque

 Rated torque

 Characteristic for continuous operation

 Limit characteristic at mains voltage of 400 V without field weakening

 Limit characteristic with field weakening

0

10

20

30

40

50

60

M [Nm]





0 1500 3000 4500



0

1

n [rpm]

1 2 ... 201 202 203 204 205 206 207 208 209 210 211 ... 953 954

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