Rotor of electric motor and method for manufacturing rotor

By using segmented rotor design and linear winding technology, the problems of manufacturing complexity and low winding density of separately excited synchronous motors have been solved, achieving efficient and low-cost rotor manufacturing and improving the power and mechanical stability of the motor.

CN121966069APending Publication Date: 2026-05-01VOLKSWAGEN AG
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Patent Information

Application Number
CN202511539079.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2024-10-29
Filing Date
2025-10-27
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

The existing separately excited synchronous motor rotor is complex to manufacture, and due to the needle winding technology, the winding density is low, the production time is long, the power capacity is insufficient, and the use of additional connecting elements affects the mechanical and magnetic properties.

Method used

The rotor adopts a segmented rotor design, which connects the rotor stack segments through force and shape matching, eliminating the need for additional connecting elements. Combined with linear winding and impregnation insulation treatment, it achieves high winding fill factor and mechanical stability.

Benefits of technology

It improves the efficiency and power capability of the motor, reduces manufacturing complexity and cost, ensures optimized mechanical and magnetic properties, and enhances the electrical insulation and reliability of the windings.

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Abstract

The invention relates to a rotor of an electric motor, the rotor comprising a rotor stack arranged on a rotor shaft of the rotor, and the rotor stack comprising a rotor yoke and a plurality of rotor teeth, each carrying an excitation winding. The rotor further comprises at least two segments which at least divide the rotor stack in the circumferential direction of the rotor, each segment comprising at least one rotor tooth with the excitation winding thereof, and at least one part of the segments comprising a section of the rotor yoke which is embodied in one piece with the corresponding rotor tooth of the segment. In this case, the sections are joined to each other via a force-fitting and / or form-fitting connection. The connection is at least partially established in such a way that the segments are clamped against each other by a force acting on the rotor stack, the force being formed as a result of a shaft-hub connection present between the rotor stack and the rotor shaft. The invention further relates to a method for producing a rotor.
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