Methods for operating an electric motor, controls for an electric motor, electric motor devices and electrical work equipment

A controller-based method adjusts electric motor power consumption according to real-time DC voltage changes, addressing overloading and voltage drops, ensuring stable operation and efficient battery use.

DE102024135518A1Pending Publication Date: 2026-06-03ANDREAS STIHL AG & CO KG
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
ANDREAS STIHL AG & CO KG
Filing Date
2024-11-29
Publication Date
2026-06-03

AI Technical Summary

Technical Problem

Existing methods for operating electric motors with DC voltage sources, particularly battery packs, fail to adapt power consumption based on real-time voltage changes, leading to potential overloading, voltage drops, and undervoltage shutdowns, especially in cold conditions or low states of charge.

Method used

A controller regulates electrical power consumption of the electric motor based on real-time DC voltage detection, adjusting power levels to maintain a stable voltage and prevent overloading by using a closed-loop control system and predefined maximum values.

Benefits of technology

The method ensures reliable operation of electric motors by preventing overloading and voltage drops, optimizing battery performance, and maintaining stable power consumption across varying conditions.

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Abstract

The invention relates to a method for operating an electric motor (130) at a predetermined speed using a controller (150) and a DC voltage source. The controller (150) is designed to regulate the electrical power consumption of the electric motor (130) during operation at the predetermined speed. The DC voltage source provides a DC voltage to supply the electric motor (130) with electrical energy. The method comprises the following steps: 1. The controller (150) detects the voltage value of the DC voltage, and 2. the controller (150) regulates the electrical power consumption based on the voltage value. With this invention, for example, a battery pack can be reliably operated as a DC voltage source even when cold and, if necessary, quickly warmed up.
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