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:
Dec. 25, 2012
Filed:
Apr. 09, 2008
Takemasa Arakawa, Chiyoda-ku, JP;
Shuya Sano, Chiyoda-ku, JP;
Takemasa Arakawa, Chiyoda-ku, JP;
Shuya Sano, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A magnetic pole position detecting device correctly acquires magnetic pole position even if two magnetic sensors are arranged at an arbitrary interval. The magnetic pole position detecting device receives the input of sensor outputs 'a' and 'b' of two magnetic sensors arranged at a predetermined interval L along a magnetic pole arraying direction and a phase difference φ between the two sensor outputs “a” and “b”. When sin φ>δ, the magnetic pole position detecting device divides a·sin φ by b−a·cos φ to calculate tan θ and outputs a magnetic pole position θ=tan{a·sin φ/(b−a·cos φ)}. When sin φ≦δ, because a=sin θ and b=cos(θ+φ), the magnetic pole position detecting device outputs magnetic pole position θ={sin(a)+sin(b)−φ}/2. Because φ=2π×L/(a magnetic pole pitch or the number of poles), by using φ as a correction coefficient for the two sensor outputs “a” and “b”, magnetic pole position error can be canceled even when the interval L is different from a theoretical value.