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

Variant	Supported
MKD EtherCAT	Yes
AKD-N	Yes
MKD-N	Yes
MKD-C	No

EtherCAT CoE and CANopen
Index/Subindex	Object Start Version
5360h/0	M_01-08-00-000