Have motor parameters identified by the i700 servo, Inverter, Determine motor parameters automatically via – Lenze i700 User Manual
Page 78: Motor parameter identification, 5motor control & motor settings, Danger
5
Motor control & motor settings
5.8
Setting the motor parameters for the servo control
78
Lenze · i700 servo inverter · Reference manual · DMS 1.5 EN · 03/2014 · TD05
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5.8.2.3
Determine motor parameters automatically via "motor parameter identification"
Functional description
The motor parameters listed in the table below can be determined automatically via the motor
parameter identification function if they are not known. The resistance values are converted via the
actual motor temperature into values that correspond to a temperature of 20°C. If a thermal
detector is not connected, a temperature value of 90°C is assumed.
Sequence of the motor parameter identification
The apparent resistance of the plant is determined for approx. 30 different frequencies. Then a
mathematical procedure is used to extract the electrical parameters of the motor.
• Since the procedure starts with very low frequencies and always considers several complete
periods, the whole process takes approx. 3 minutes.
• During the procedure, the motor is energised with a current, the r.m.s. value of which
corresponds to the lower of the following two values:
Tip!
If an asynchronous motor is to be identified, the identification should be executed with half
the rated motor current in order to achieve an optimal result. For this purpose, the rated
device current has to be higher than half the rated motor current. In case of a synchronous
motor, this is irrelevant.
Danger!
This procedure may only be carried out during commissioning, not during operation!
• During the procedure the motor is energised so that:
• it cannot be excluded that the connected mechanical components may move!
• the windings heat up.
If you repeat the procedure, ensure that the motor is not thermally overloaded
(particularly if no temperature feedback is used).
Object
Name
Required for
Axis A
Axis B
SM
ASM
Motor: Stator resistance (value at 20°C)
Motor: Stator leakage inductance (L
ss
)
Motor (ASM): Rotor resistance (value at 20 °C)
Motor (ASM): Mutual inductance (L
h
)
Motor (ASM): Magnetising current
or
Rated device current
1
2
---
Rated motor current
⋅