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:
Aug. 23, 1994
Filed:
Aug. 05, 1993
Tetsuo Yamada, Tokyo, JP;
Kabushiki Kaisha Meidensha, Tokyo, JP;
Abstract
In a vector control apparatus for an induction motor, a divider (13) is provided which receives an exciting instruction .lambda..sub.2d */M* from a secondary magnetic flux instruction amplifier (1.sub.1) which outputs .lambda..sub.2d */M* according to an angular frequency .omega..sub.r derived from a speed detector (4.sub.3). The divider (13) receives an exciting inductance variation A.sub.Mn from the exciting inductance M' compensation circuit (12, 12') to divide A.sub.Mn by .lambda..sub.2d */M* so that the derived output value is supplied to a first-order advance element calculation block (1.sub.2) so that a target value i.sub.1d * in a d-axis component in a primary current of the induction motor is derived.