MOTOR.IMTR

Description

The rotor time constant is calculated as the ratio between rotor magnetizing inductance Lm and rotor resistance Rr from the following equivalent circuit of an induction machine.

Alternatively, the rotor time constant can be estimated from the rated current, magnetizing current (MOTOR.IMID) and rated slip frequency as follows:

"tau = square root open parenthesis Is root-mean-square squared minus Id root-mean-square squared close parenthesis divided by open parenthesis Id root-mean-square times omega-slip close parenthesis

where Is,rms is the rated current, Id,rms is the rated magnetizing current, and ωslip is the rated slip frequency in rad/s.


  • τ is in seconds for the above formulas. It needs to converted to ms for the MOTOR.IMTR setting:
    MOTOR.IMTR(ms) = τ*1000

General Information

Type

R/W

Units

Ms

Range

1 to 16,000

Default Value

100

Data Type

Integer

Start Version

M_01-08-00-000

Variants Supported

Variant Supported
AKD Base Yes
AKD with Position Indexer Yes
AKD EtherCAT Yes
AKD CANopen Yes
AKD BASIC Yes
AKD SynqNet Yes*
AKD EtherNet/IP Yes
AKD PROFINET Yes
AKD Sercos® III Yes
AKD-N Yes
AKD-C No

*In SynqNet, a parameter may be available in the firmware but have no effect on the system. See SynqNet Supported Parameters.

Fieldbus Information

If your drive type is listed as supported but no index, address, or instance number is listed, then this parameter is accessible through WorkBench, but not over your fieldbus type. For information on SynqNet parameters see SynqNet Supported Parameters.

EtherCAT CoE and CANopen
Index/Subindex Object Start Version

5360h /0

 M_01-08-00-000
PROFINET and Sercos® III
Fieldbus Address Attributes Signed?

PROFINET

2864 Word No
Sercos® III 2 Octets
EtherNet/IP
Instance Data Size Data Type
865 2 Byte Integer
Modbus
Register Address Is 64 bit? Attributes Signed? Object Start Version

1728

 No 16-bit No M_01-08-00-000

Related Topics

Motor View