Electromagnetic rotary drive device, centrifugal pump, and pump unit

Abstract

To provide an electromagnetic rotary drive device that can be designed in a small size and that has a rotor that can be magnetically levitated without contact.SOLUTION: An electromagnetic rotary drive device 1 includes a stator 2 having a plurality of coil cores 25 which are six coil cores 25, each of the coil cores 25 includes a longitudinal rim 26 extending in the axial direction A, and a transverse rim 27 arranged perpendicular to the longitudinal rim 26 and extending radially and bounded by an end face 211. The coil cores 25 are arranged equidistantly on a circular line such that the end face 211 surrounds the rotor 3 of the electromagnetic rotary drive device 1. Each longitudinal rim 26 of the coil core 25 has a first portion 261 and a second portion 262, the first portion 261 and the second portion 262 are arranged parallel to each other per longitudinal rim 26, and are joined together by a transition region 263 whose radial distance from the corresponding end face 211 varies from a first distance to a second distance.SELECTED DRAWING: Figure 3

Images