Method for determining a gain error of a current measuring device

US11768243B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Yuping Chen · Aichholzhof, DE
• Gunther Goetting · Stuttgart, DE
• Lei Chen · Chengdu, CN

Key dates

• Filing date: Dec 19, 2019
• Grant date: Sep 26, 2023
• Expiry date: Jul 11, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02P21/22
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to a method for determining a gain error of at least one current measuring device (8, 9, 10) of a sensor unit (7) of an electric machine (1), wherein the machine (1) has a stator winding (2) having at least three phases (U, V, W) and a rotor (5) which is mounted so as to be rotatable about an axis of rotation (6). According to the invention, an electric sensor voltage (11) is applied to the phases (U, V, W), the sensor voltage (11) having at least a first voltage pulse (12) of a first voltage vector and a second voltage pulse (13) of a second voltage vector, the first voltage vector and the second voltage vector being oriented in different directions in each case perpendicularly to the axis of rotation (7), at least one first current value of a first of the phases (U), at least one second current value of a second of the phases (V) and at least one third current value of a third of the phases (W) are detected during the application of the sensor voltage (11), a sum current vector is determined on the basis of the detected current values of all of the phases (U, V, W), and the sum current vector is compared with at least one determined or stored reference curre…