Verfahren zur Messung der Elektrischen Wicklungsparameter bei Bipolaren Schrittmotoren im Haltezustand

Details

Veröffentlichungs-Nr.

EP4723469

Anmeldetag

18. September 2025

Veröffentlichung

8. April 2026

Rechtsraum

EP

IPC

H02P8/34, G01R31/34(RAJA RAKESH et al.)

Abstract

Disclosed herein is a method for controlling a stepper motor driver (5) including a control logic (14), a digital-to-analog converter, DAC (15), and two H-bridge circuits for controlling first and second windings (L1, L2) of a bipolar stepper motor (10). The method includes determining desired current signals for the windings (L1, L2) based on a rotational position of the stepper motor (10), converting the desired current signals into analog reference voltages using the DAC (15), generating pre-drive signals based on the analog reference voltages, and controlling the H-bridge circuits using the pre-drive signals to regulate currents through the windings (L1, L2). Voltage drops across sense resistors (RSNSA, RSNSB) are monitored by the control logic (14) as feedback. The desired current signals are determined by generating time-varying periodic current patterns for the windings (L1, L2), the current pattern for the second winding (L2) being phase-shifted relative to the current pattern for the first winding (L1), and both current patterns being dependent on a step frequency of the bipolar stepper motor (10).

Anmelder

Firma

STMicroelectronics International N.V.

Land

🇨🇭 Schweiz