Method and apparatus for determining the flux angle of rotating field machine or for position-oriented operation of the machine

US4763058A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Hans-Dieter Heining · Rednitzhembach, DE
• Albert Wick · Geiselhöring, DE

Key dates

• Filing date: Dec 4, 1986
• Grant date: Aug 9, 1988
• Expiry date: Dec 4, 2006

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02P21/34
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

For establishing the field direction without mechanical pickup upon startup of a rotating field machine, e.g., in permanent excitation, a high-frequency component (iz*) is impressed on the stator current or on the stator voltage. Thereby high-frequency voltage components (or current components) are coupled into the stator windings, the envelope curves of which are correlated to the position of the field axis of rotor axis. Preferably the components of a model vector (FM) which also contain high-frequency components are calculated by a flux computer (60). The high frequency components isolated in a filter (61) are correlated in a means value former (62) to the components of the direction vector (fx). Thereby a field-oriented operation of a synchronous machine is possible.