Impedance

Overview

The aim of this section is to compute the inter-bar impedance of the squirrel cage.

In the section on impedance, two solutions are proposed to compute the end-ring impedance:
  • None: Automatic mode.
  • Constant: A user mode where it is possible to impose the different values of resistances and inductances.
Table 1. End-ring – Impedance – Two modes of definition are available


1 Default setting: Automatic way for computing the end-ring impedance. It is based on internal computation processes.
2 Button to select a user mode for setting the different values of resistance and inductances

Automatic

When automatic computation mode is set, inter-bar end-ring impedances are computed with internal processes, being a function of the slip (or speed), the temperature at the end-ring (at Connection Side and Opposite Connection Side), and the material of the end-ring.

Constant computation mode

When constant computation mode is set, the inter-bar end-ring resistances and inductances values must be set by the user. The values are given for a reference temperature. In this case the inter-bar end-ring resistances and inductances depend on the temperature and materials of the end-ring.

Table 2. End-ring – Constant computation mode


1 Reference temperatures for both sides of the machine
2 Impedance characteristics to be defined on both sides of the machine