Examination of Errors in Windings for Magnetic Levitation Motors with Flexible PCB

Abstract

　The magnetic levitation motor has no friction or wear, it can realize high rotation speed with a very long duration. We use flexible PCB technology to improve the copper space factor and manufacturing accuracy of the magnetic levitation motor. We wound a flexible PCB sheet with an air-core coil printed on it around a back-iron to produce two windings pairs. The effects of errors during manufacturing cannot be ignored; it is necessary to anticipate mistakes and improve winding patterns. In this paper, we explained the motor’s structure and the structure of the flexible PCB and the error that occurs during the winding roll-up process. We clarified that the most massive error exists in the gap between the back-iron and the first sheets.