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. 28, 2000
Filed:
May. 10, 1999
Yoshiki Ito, Nagoya, JP;
Katsuhiro Asami, Chiryu, JP;
Aisan Kogyo Kabushiki Kaisha, , JP;
Abstract
A small-sized, light-weight DC torque motor with good response characteristics. The motor is a moving magnet type DC torque motor rockable in a rocking angle of 0=45 to 135 degrees. The motor includes a stator with a coil wound around a portion thereof, the stator having a generally U-shape and having end portions facing each other and having magnetic pole sections arranged thereon; and a needle surrounded by the end portions of the stator, being rotatably supported, and including permanent magnets attached thereto; so that the needle can be rocked within a predetermined working angle range; a portion of the stator has a section area A smaller than that of the magnetic pole sections, the stator is formed of a material having a saturation magnetic flux density B, and the section area A satisfies the condition that the product of A and B is smaller than the sum of (i) a magnetic flux quantity which occurs when an electric current flows in the coil and (ii) a maximum permanent magnetic flux quantity generated by the permanent magnets within the working angle range