Rise in temperature at increasing speeds
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In addition to the ohmic losses, the resetting losses primarily rise with increasing speed. These are also called iron losses and increase quadratically with the frequency.
The motors are operated at high supply voltages, thus the nominal current in the winding can be kept constant for a relatively long time and hence the torque characteristic remains constant for quite a long time and only drops much later.
At medium supply voltages (48-70 V), by contrast, the nominal current decreases earlier so that the ohmic losses can be compensated by the earlier current reduction and the quadratic iron losses from a certain speed. Thus, the motors do not excessively overheat, do not require any additional fans and are conserved in terms of the expected service life.
