Coordinates regulation of AM by changing of stator supply voltage

One of the possible methods of coordinates regulation of AM is the changing of stator supply voltage without the frequency changing.

To realize this method between the supply network and AM voltage converter is situated, for example, TVR – thyristor voltage regulator, for changing of voltage value in accordance to control signal , that is applied to stator circuit, figure 4.34.

At such regulation the synchronous angular speed and critical sliding remain constant with the voltage decreasing, the rigidity of mechanical characteristics decreases. It is not the best method of speed regulation, because with the voltage decreasing the range of regulation changes a little, but maximal and current motor moments decreases essentially (in view of that ), and so its overload capability (see artificial characteristics 1-3, figure 4.35), however this method is more rational at regulation of other coordinates of AM, for example, of moment and current.

Figure 4.34 – The scheme of AM powering with the voltage regulator.

Figure 4.35 – Mechanical characteristics of AM at supply voltage decreasing.

Дата добавления: 2014-01-05