High-current connections to a dynamoelectric machine

The use of a busbar with contact cams to connect inverter modules to conductor bars in dynamo-electric machines addresses power loss issues by reducing contact resistance and simplifying maintenance, enabling efficient high-current transfer.

WO2026132239A1PCT designated stage Publication Date: 2026-06-25INNOMOTICS GMBH
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
INNOMOTICS GMBH
Filing Date
2025-12-18
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Existing high-current connections in dynamo-electric machines suffer from significant power losses due to numerous high-resistance contact points and complex, cumbersome current routing, particularly in integrated drive systems with inverter modules and conductor bars.

Method used

A one-piece busbar with contact cams is used to connect inverter modules to conductor bars, minimizing contact resistance by providing larger contact areas and reducing the number of contact points, with the busbar designed to carry partial currents from multiple inverter modules in parallel.

Benefits of technology

This design significantly reduces power losses and simplifies maintenance by minimizing contact resistance and allowing for a compact, efficient transfer of high currents with minimal losses.

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Abstract

The invention relates to a rotating dynamoelectric machine (1), comprising: - a stator (2) that is constructed as a hollow-cylindrical magnetically conductive body having a stator bore (26) and has a winding system that is formed from conductor bars (4) in slots (3) of the magnetically conductive body and is arranged in the region of the inner casing of the stator bore (26), - a rotor (31) arranged in the stator bore (26), wherein the stator (2) and the rotor (31) are separated from one another by an air gap (30), - wherein the first ends of the conductor bars (4), said first ends protruding from a respective slot (3) on an end face of the magnetically conductive body of the stator (2), are each electrically contact-connected with low resistance to at least one busbar (5), - wherein the busbar (5) has at least one contact cam (9) in order to create an electrical contact connection between the contact cam (9) and an associated inverter module (6) by way of a contact-making means, - wherein the second ends of the conductor bars (4) on the other end face of the magnetically conductive body of the stator (2) are combined to form a short-circuit ring.
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