Circuit arrangement for starting detection of three-phase generator

US5602470A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Walter Kohl · Bietigheim, DE
• Rainer Mittag · Kornwestheim, DE
• Matthias Hoeber · Stuttgart, DE

Key dates

• Filing date: Apr 10, 1995
• Grant date: Feb 11, 1997
• Expiry date: Apr 10, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G01P3/465
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a circuit arrangement for measuring a starting of rotation of a generator having an exciting winding and three-phase windings, a voltage regulator regulates an output voltage of the generator by influencing an exciting current, the three-phase windings are connected to one another at a point, one of the phase windings is connected to ground via a first resistor, another of the phase windings is connected to ground via a second resistor, a voltage across the first resistor is evaluated as a rotational-speed-dependent alternating voltage, this voltage is compared with a threshold voltage, and the starting of the rotation of the generator is detected when the measured voltage exceeds the threshold voltage.