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:
Nov. 26, 1985
Filed:
Mar. 15, 1984
Ryoichi Kurosawa, Kokubunji, JP;
Takeo Shimamura, Hachioji, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
In an AC current control system for controlling multi-phase AC currents supplied from a power converter to a load, the currents are detected and coordinate-transformed into orthogonal two-axis current values i.sub.d, i.sub.q in a rotating coordinate rotating at an angular frequency .omega., and then compared with the references. The deviations are used to determine two-axis voltage values e.sub.d *, e.sub.q *, which are coordinate-transformed into multi-phase voltage values determining the output voltages of the power converter. The system is characterized in that the voltage value e.sub.d * is determined not only from .DELTA.i.sub.d but also from the product of .omega. and .DELTA.i.sub.q, while the voltage value e.sub.q * is determined not only from .DELTA.i.sub.q but also from the product of .omega. and .DELTA.i.sub.d. This arrangement makes it possible to provide a voltage component corresponding to the voltage drop across the inductive component of the load which is 90.degree. in advance of the current.