Standstill heating for motor
The method for sensorless heating of electric motors using DC voltage and current measurements addresses the challenge of moisture damage by estimating temperature through resistance changes, ensuring effective heating and protection.
WO2026130939A1PCT designated stage Publication Date: 2026-06-25KSB SE & CO KGAA
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- KSB SE & CO KGAA
- Filing Date
- 2025-11-20
- Publication Date
- 2026-06-25
AI Technical Summary
Technical Problem
Existing electric motors without integrated temperature sensors face challenges in controlled heating during standstill phases, leading to potential moisture damage from condensation, as the lack of temperature feedback hinders effective heating management.
Method used
A method for sensorless controlled heating of electric motors using DC voltage to energize and measure phase winding currents, allowing resistance-based temperature estimation without a temperature sensor, ensuring heating to a desired temperature level.
Benefits of technology
Enables effective heating of electric motors to prevent condensation and maintain optimal operating conditions without the need for temperature sensors, enhancing motor protection and performance.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure EP2025083617_25062026_PF_FP_ABST
Abstract
The invention relates to a method for the controlled heating of an electric motor at a standstill, wherein the motor is a multi-phase motor in a star connection, and a power electronics system is provided that is used to energise the stator phases and makes it possible to measure the current in the individual phases, and wherein the method comprises the following method steps: detecting a standstill phase of the motor, in which the motor is cooled to a constant temperature level; applying a first DC voltage to all phase windings, wherein one of the phase windings is set to a positive voltage potential and the remaining phase windings are set to a negative voltage potential; measuring the phase currents in the phase windings and storing the measured phase currents or a variable derivable therefrom as reference values, applying a second DC voltage to only a part of the phase windings in order to heat a part of the phase windings, and repeatedly applying the first DC voltage to all phase windings according to method step b; and measuring the phase currents, wherein a temperature rise in the heated phase winding or the heated phase windings is determined by comparing the measured phase currents or a variable derived therefrom with the stored reference values.
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