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Temperature rise with increasing speed

time:2014/11/5 11:03:58 click:1529times

Apart from the ohmic losses, it is primarily the magnetic hysteresis losses that increase with the speed. These increase with the square of the frequency.

If the motors are operated at high supply voltages, the nominal current can be kept constant in the winding for a relatively long time. Thus, the torque curve also remains constant for a fairly long time and only drops off considerably later.

At medium supply voltages (48–70V), the nominal current decreases earlier so that the ohmic losses can be compensated through the earlier current reduction and the quadratic hysteresis losses beginning at a certain speed. As a result, the motors do not overheat excessively, do not require an additional heat sink and achieve a longer life span.

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