Patent ID: 11881752
Assignee: ZHEJIANG UNIVERSITY ADVANCED ELECTRICAL EQUIPMENT INNOVATION CENTER
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. A direct-drive type annular flexible transportation system, comprising:
the system comprising an annular base and a primary excitation type linear motor, wherein the primary excitation type linear motor is installed on an annular side surface of the annular base; the primary excitation type linear motor comprises a long stator and a plurality of movers, the movers operate independently of one another without electromagnetic coupling, the movers are attached onto the long stator by magnetic attraction, and air gaps are provided between the movers and the long stator,
the long stator is fixedly connected to the annular base and is formed by seamless connection of stator iron cores presenting a multi-segment cogging structure arranged along the annular side surface of the annular base, inner surfaces of the stator iron cores are fixed on the annular side surface of the annular base, and outer surfaces of the stator iron cores are provided with slots in an annular direction of the annular base,
each mover comprises a short primary and roller guide rail assemblies, the short primary and the roller guide rail assemblies are fixedly connected together by brackets, the short primary is located outside the long stator, an air gap is provided between the short primary and the long stator, both sides of the short primary are provided with the roller guide rail assemblies, each roller guide rail assembly comprises a roller and a guide rail, the guide rail is laid in the annular direction of the annular base, parallel to an arrangement direction of the long stator, and fixedly connected to the annular side surface of the annular base, and the roller is connected to the guide rail and moves along the guide rail,
the short primary comprises an asymmetrically-structured permanent magnet array, armature windings, and a primary iron core, the primary iron core is provided with semi-closed slots on a side facing the long stator, a plurality of semi-closed slots are provided at intervals parallel to the arrangement direction of the long stator, armature teeth are formed between adjacent semi-closed slots, and each armature tooth is wound with a coil as the armature winding,
the permanent magnet array is formed by permanent magnet units closely arranged side by side and is attached to a surface of the armature teethes of the primary iron core, each permanent magnet unit is composed of a permanent magnet A and a permanent magnet B arranged side by side in a fixed order in any single direction parallel to the long stator, the permanent magnet A and the permanent magnet B have opposite polarities, the width of the permanent magnet B in the arrangement direction of the long stator is greater than the width of the permanent magnet A in the arrangement direction of the long stator, forming asymmetry; one permanent magnet B is arranged at an opening of each semi-closed slot, and one permanent magnet A is arranged on an outer end surface of the armature tooth of each semi-closed slot.