Experimental study on boosting small electric drive systems in short-term operation

Inhalt:
This article deals with the matter of boosting small electric drive systems. Boosting thereby means the use of overload potentials, which are applicable in short-term and intermittent operation of motors. This behaviour can be utilized to realize smaller and more cost-effective drive system solutions and therefore the broadening of associated knowledge is beneficial. Torque overload factors are experimentally determined in this paper, considering a coreless as well as a slotted motor type. A comparison with theory shows distinct higher values received from the experiments. This difference is traced back to a certain lack of applicability regarding the given thermal time constants, which are used to calculate the theoretical overload factors. Moreover, this paper shows a limited usefulness to overload the given slotted motor, as saturation effects occur and lead to a comparatively worse efficiency level. On the contrary, the coreless motor is proved to be suitable for high level boosting.