Method and apparatus for operating an electric machine with an electrically generated excitation magnetic field

The method for operating an electric machine with hybrid phase strands addresses inefficiencies and complexity in synchronous machines by generating both driving and excitation currents within the stator, achieving efficient and cost-effective energy transmission to the rotor.

DE102024211307A1Pending Publication Date: 2026-05-28ROBERT BOSCH GMBH
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
ROBERT BOSCH GMBH
Filing Date
2024-11-26
Publication Date
2026-05-28

AI Technical Summary

Technical Problem

Existing electrically excited synchronous machines suffer from high ohmic losses, increased leakage inductance, and require additional components like transformers, leading to inefficiencies and increased complexity and cost.

Method used

A method for operating an electric machine with a stator arrangement that includes hybrid phase strands, allowing separate control of stator coils to generate both the driving magnetic field and excitation current, eliminating the need for additional windings and transformers, and using a control scheme to superimpose excitation AC voltage on regular phase voltage.

Benefits of technology

This approach reduces manufacturing complexity, minimizes losses, and enhances efficiency by enabling contactless transmission of electrical energy to the rotor, thus reducing installation space and costs.

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Abstract

The invention relates to a method for operating a multiphase electric machine (1), wherein a stator arrangement (21) provides regular phase strands (V, W) and a hybrid phase consisting of several hybrid phase strands (U1, U2) each with one or more stator coils (23), wherein the electric machine (1) is operated by the following steps: - Determining the phase voltages for the regular phase strands (V, W) and the hybrid phase; - Determining the excitation alternating voltage to be set; - Applying an excitation alternating voltage to the phase voltages for the hybrid phase strands (U1, U2).
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Citation Information

Patent Citations

  • Brushless synchronous machine

    JP1992347566A

  • Low profile generator configuration

    US20050218740A1