Radiation

Radiation mode

This panel allows describing the parameters defining the radiation phenomenon existing in the machine.

Two ways are proposed to define the radiation: an automatic and a user one.

Table 1. Radiation modes – Ways for defining the radiation effect


1 Auto mode: This mode allows to set the internal emissivity automatically by an internal process.
2 User mode: This mode allows to set the internal emissivities manually.

User mode

Mainly, two radiation phenomena exist in the machine:
  • From the end windings, rotor and stator ends to the frame and the end caps.
  • Between the rotor and the stator, in the airgap.
Table 2. Internal cooling - Radiation design area. The example shown corresponds to an IMSQ IR machine


1 User inputs for the radiation definition
2 Radial view of the motor, where specific exchange areas can be highlighted depending on the selected input.
3 Axial view of the motor, where specific exchange areas can be highlighted depending on the selected input.
Input related to the radiation corresponding to the selected radiation mode. In user mode, the following emissivities must be set:
  • The frame inner surface emissivity, with a default value of 0.8
  • The rotor and stator emissivity, with a default value of 0.3.

    These emissivities are used for the radiation occurring in the airgap, and from the rotor end and stator end to each end space.

  • The end winding emissivity, with a default value of 0.4.

    This emissivity is applied to non-potted end-windings only. The assumption is made that the potted end-windings do not radiate any power.

  • The field end winding emissivity, with a default value of 0.4 (only for SM-WFISP machines).
  • The rotor end ring emissivity (only for IMSQ and SM-WFISP machines), with a default value of 0.4.