User Manual of EM730 Series Inverter Chapter 8 Motor Parameter Self-identification 8.1 Motor Parameter Self-identification When the vector control mode is selected, the motor parameters must be self-identified. For non-vector control, it is recommended to perform parameter self-identification during the first run in order to improve the control accuracy. The motor parameters required for calculation in vector control are usually not available to users. The EM730 series inverter has the function of motor parameter self-identification.
When the self-identification is enabled, the inverter will automatically test the relevant parameters of the connected motor and store them into the internal memory. Fig. 8-18 shows the specific meanings of the parameters of the three-phase asynchronous motor. Fig. 8- 18 Equivalent Circuit of Three-phase Asynchronous Motor R1, R2, L1, L2, Lm, and I0 in the figure represent: stator resistance, rotor resistance, stator self-inductance, rotor self-inductance, mutual inductance, and no-load excitation current. The leakage inductance is Ls=L-Lm. 8.2 Precautions before Self-identification Motor parameter self-identification is a process of automatically measuring motor parameters.
The EM730 series inverter can perform the static and rotary self-identification of motor parameters. The static self-identification is applicable when the motor load cannot be removed but the motor parameters are available. 349