The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 19, 1991
Filed:
Nov. 22, 1988
Georg Heinle, Erlangen, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
The invention relates to a method for simulating the actual load angle value (.nu.) of polyphase machine from the terminal voltages (u.sub.R, u.sub.S) and conductor currents i.sub.R, i.sub.S) of at least two phases (R, S) of the stator of a polyphase machine, each of which represents stator-oriented a-c variables, where said stator-oriented a-c variables (u.sub.R, u.sub.S, i.sub.R, i.sub.S) are transformed into a first stator current component (i.sub.1) and a second stator current component (i.sub.2) of the machine current vector (i.sup.s) and an absolute value of the machine flux vector (.vertline..phi..sup.s .vertline.), each of which are field-oriented d-c variables. According to the invention, a first corrected stator current component (i.sub.1) consisting of a stationary component (i.sub.1s) and a dynamic component (i.sub.1d) is generated where the stationary component (i.sub.1s) is determined form the absolute value of the machine flux vector (.vertline..phi..sup.s .vertline.) divided by the value of the main machine inductance (1.sub.H) and the dynamic component (i.sub. 1d) is equal to the high-frequency share of the first stator component (i.sub.1) and the actual load anglevalue (.nu.) is derived form the relation .nu.=tan.sup.-1 i.sub.2 /i.sub.1. Thus, the actual load angle value (.nu.) can be simulated over the entire control ragne of the polyphase machine without error.