**Author details**

24 Will-be-set-by-IN-TECH

**Figure 18.** Measure and estimate of speed during deceleration phase: *x*<sup>5</sup> and *x*ˆ5

• Parameters error, mainly on stator and rotor resistance (*RS*, *RR*).

when a basic microprocessors are used in an industrial context.

• Poor current dynamic, combined to digitizing error at low frequency working.

dynamical phases as we can see on figure 16. About this bad results, we have 2 arguments:

threw temperature.

**6. Conclusion**

induction machine was introduced.

out various tests of validation.

introduce a news strategy.

Figures 12 and 13 at high speed, show that speed approximation proposed in equation (51) work and permit to obtain magnitude and speed sign. This efficiency is also proved during

To overcome all this features, we propose to use an on-line resistor measurement of stator

Through this chapter an original method of observation without mechanical sensors for

Designed for a embedded system (VAR-CNTRL) equipped with a fixed point DSP, we carried

We used concept of Sliding Mode through Super Twisting Algorithm, and oversampling method being based on the explicit Euler development. The contribution of this paper is mainly based on the applicability of the proposed observer for sensorless induction motor

At the time of the setting works of our strategy some technical constraints brought us to

Sebastien Solvar, Malek Ghanes, Leonardo Amet, Jean-Pierre Barbot and Gaëtan Santomenna *ECS - Lab, ENSEA and GS Maintenance, France*
