By Rene Husson

The kind of keep watch over procedure used for electric machines is dependent upon the use (nature of the weight, working states, etc.) to which the computing device might be positioned. the right form of use determines the keep an eye on legislation which follow. Mechanics also are vitally important simply because they have an effect on functionality. one other issue of crucial value in commercial functions is working defense. eventually, the matter of the way to regulate a few various machines, whose interactions and outputs has to be coordinated, is addressed and suggestions are offered. those and different concerns are addressed the following via more than a few specialist individuals, each one of whom are experts of their specific box. This booklet is basically aimed toward these all for complicated structures layout, yet engineers in a number of comparable fields reminiscent of electric engineering, instrumentation and keep watch over, and commercial engineering, also will locate this an invaluable resource of data.

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19 gives the evolution of the friction force, according to the displacement during a cyclic load. The observed behavior is similar to the ratchet phenomena in viscoplasticity. 19. 17] where T2C is the Coulomb friction force. In this model T2 only depends on the position and not on the velocity. It thus cannot account for the Stribeck effect. It is also impossible to take into account the adhesion phenomena. Consequently, in spite of its ability to express the hysteresis according to the load, this model’s inadequacies led to the proposal of other empirical approaches.

It seems that the introduction of the hysteretic behavior of visco-plasticity should take into account the phenomenon studied by Dahl, for 28 Control Methods for Electrical Machines example, Ruina [RUI 83] who introduces explicitly internal variables to report the memory of glidings. 19] dc represents a critical distance of the asperities order of magnitude and uc and (A B) are sizing parameters. 2. , De la résistance causée dans les machines tant par les frottements des parties qui les composent que par la roideur des cordes qu’on y employe et la manière de calculer l’un et l’autre, Histoire de l’Académie Royale des sciences, report of 19 December 1699, printed Paris in 1732, p.

When 3O 4 , surfaces are in weak contact, and the wear is weak. 4 , it is a fluid lubrication regime without any contact between surfaces, and thus without Overview of Mechanical Transmission Problems 27 wear: this is the domain of the hydrodynamic or hydrostatic lubrication of surfaces in contact and elastohydrodynamic lubrication of Hertzian contacts. Obviously, the pressure also plays a role in the film thickness of oil during functioning; and the Stribeck curve is sometimes represented by the ratio (speed/pressure) instead of the thickness.

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