The invention relates to a micromotor (10), the stator of which contains a backiron jacket (18). Said back iron jacket consists of a continuous unslotted sleeveconsisting of a metal alloy that contains ferritic iron as the main constituent,up to 30% chromium and preferably aluminium and yttrium oxide. Electric conductivityis reduced by the oxidation of the aluminium. The yttrium oxide performs the samefunction. The reduced electric conductivity suppresses eddy currents to a greatextent. The back iron jacket (18) has a high magnetic conductivity with a smallwall thickness, thus increasing the electrical output for a motor with a smalldiameter.
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