Operating

The inter-bar end-ring impedances must be defined by considering referent temperatures for the bars and end-rings.

Table 1. End-ring – Definition of operating conditions for evaluating the end-ring characteristics


1 Definition of the temperatures (Bars) for which the impedances will be evaluated.
Note: This value impacts the bar extension impedance to be considered with the end-ring one.
2 Definition of the temperatures at each side (end-rings) for which the impedance will be evaluated.
Note:
  • The main results data are given in the datasheet (central window of the end-ring area).
    • Material, Masses and cost
    • Material electrical resistivity
    • Inter-bar resistance and inductance
  • In the table “Material electrical resistivity data”, the “corrected” resistivities are computed to give a bar resistance on the rotor lamination length equal to the bar resistance computed on the total bar length with the bar real resistivity (rotor lamination length + bar extensions). The corrected electrical resistivity values are used in Flux® 2D for internal computations and exports.