Implementation of an Improved Disk-Type Magnetic Levitated Motor

An improved structure of an experimental disk-type magnetically levitated motor (MLM) is proposed in this paper. The MLM is a three-phase ac type motor with eighteen laminated steel cores. Compared with the previously designed MLM (PMLM), the improved structure has a trapezoid iron block added on the top of each laminated thin steel core to provide better magnetic paths. The improved MLM (IMLM) has short start-up response time where it takes less than 2 seconds to reach its final stable speed. Beside, the rotational speed of the plate is very stable. The 2D finite element analysis method has been used to illustrate the magnetic flux distribution of the IMLM and PMLM. Experimental measurements are also provided and the results show that the IMLM has less speed variation, higher efficiency and better load regulation