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. 09, 1982
Filed:
Jun. 27, 1980
Takanobu Iwakane, Kitakyushu, JP;
Tohru Kai, Kitakyushu, JP;
Kenji Hirose, Kitakyushu, JP;
Koichiro Nakagawa, Kitakyushu, JP;
Kabushiki Kaisha Yaskawa Denki Seisakusho, Tokyo, JP;
Abstract
In a speed detector having a fixed frequency oscillator for producing two-phase sine waves to excite two-phase exciting windings of a resolver, first and second multipliers for multiplying the output of the detecting winding of the resolver by the two-phase sine waves respectively, and a position conversion circuit and speed conversion circuit, the speed conversion circuit comprises: a third multiplier for multiplying a signal of the first multiplier by a signal of a VFO; and a fourth multiplier for multiplying a signal of the second multiplier by a signal of the VFO, the outputs of the third and fourth multipliers being applied through a comparator to a proportional integration amplifier, the output of which is used as the rotation speed signal and applied to the VFO, thereby to eliminate the necessity for provision of a countermeasure against harmonics and harmonic noise involved in the use of an integration circuit required when a resolver is used as a detector.