Method for determining the rotor position of an EC motor
JP2026519268APending Publication Date: 2026-06-15SCHAEFFLER TECHNOLOGIES AG & CO KG
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Patent Information
- Application Number
- JP2025559756
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-04-11
- Filing Date
- 2024-02-09
- Publication Date
- 2026-06-15
AI Technical Summary
Technical Problem
Existing methods for determining the rotor position of an electronically commutated electric motor (EC motor) face limitations due to maximum voltage constraints, leading to unreliable signal evaluation and the need for additional sensors at high speeds.
Method used
A method that injects voltage signals into multiple phases of the stator, pauses the injection when the voltage approaches the maximum, and determines the rotor position using current signals from non-exceeding phases, without requiring additional sensors.
Benefits of technology
Enables accurate rotor position determination across varying speeds, extending the EC motor's performance range without additional sensors, and maintaining reliable signal evaluation.
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Smart Images
Figure 2026519268000001_ABST
Abstract
For an EC motor (1), the rotor position of the EC motor is determined by injecting a voltage signal (320) into the phases (21, 22, 23) of the EC motor and evaluating the resulting current fluctuations. The injection is paused for each phase (21, 22, 23) when the voltage of the phase (21, 22, 23) approaches its maximum value (550).
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