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:
Oct. 09, 2001
Filed:
Dec. 10, 1999
Yuzuru Suzuki, Shizuoka-ken, JP;
Sakae Fujitani, Shizuoka-ken, JP;
Naoyuki Harada, Shizuoka-ken, JP;
Minebea Co., Ltd., , JP;
Abstract
In a device wherein a rotary shaft is provided in a pipe through which a fluid is passed, a butterfly valve is installed in the pipe, an actuator and an angle sensor are directly arranged on the outer end of the pipe of the rotary shaft, and angle control for adjusting an angle detection signal to a command value is performed to thereby adjust an amount of a fluid passing through the pipe. An actuator includes a rotor composed of a permanent magnet rotatably supported by the rotary shaft and has two magnetic poles, namely, N and S poles, and a stator composed of a winding wrapped around a cylindrical core formed of a soft magnetic member. Two phase separating members are provided on a circumference of the core so that the phase separating members are disposed to geometrically form an angle of substantially 180 degrees relative to each other, and two independent sets of coils are wound around the core at a substantially uniform density in a winding region on a core circumference that has been divided by the phase separating members.