Enduring (long-term) rated mode (S1)

This mode of electric motor is as long-term at the constant load, as over temperature of all EM parts is equal to .

At the figure there are such notations: P – power on the shaft, - losses of power, - temperature, - steady temperature, - environment temperature, - time of turning-on

There are next data in the published data for long-term mode:

- power, [кWt];

- frequency of rotation, [rpm];

- voltage, [V];

- current, [А].

Adherence of stated heating standards guarantees stated service life of EM (about 20 years) and vice versa: over temperature leads to the insulation destruction and reduction of service life. Though rated temreture exceeding (even short-time) EM of A class of insulation in 5-8 degrees of C reduces service life of EM twice. Irrespective (of) technology process EM is always heated to the environment temperature, the magnitude of which differs for the climates of the Earth. In the choosing EM calculation Maximal magnitude is taken for the appropriate climate. For example, Ukraine is a zone with temperate climate..

Дата добавления: 2014-01-05