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. 24, 1991
Filed:
Oct. 31, 1990
Shigeru Sakagami, Nagoya, JP;
Toshiaki Onoyama, Nishio, JP;
Yoshiaki Nagasawa, Toyota, JP;
Toshihiro Andou, Okazaki, JP;
Toyota Shatai Kabushiki Kaisha, Aichi, JP;
Abstract
A brushless DC linear motor includes a coil unit in which electric flow terminals of each of three flat coils are connected with a star connection or with a delta connection; and the three flat coils have the same shape whose empty core section and winding section have their dimension of breadth determined on 1/2 of a magnetic pole-pitch of a magnetic body and are arranged in a shifted position of the magnetic pole-pitch by n/3 (n is a natural number excluding multiples of 3) on the coil unit. The motor also includes a sensor unit in which three magnetic detection sensors corresponding to the respective flat coils are arranged at intervals of 1/3+2m (m=0, 1, 2, 3, . . . ) of the magnetic pole-pitch and any of these magnetic detection sensors and its corresponding flat coils are arranged at the determined distance in accordance with the magnetic pole-pitch. In accordance with the signal from each of the sensors detecting the polarity of the magnet body, an electric flow switching means transfers the electric flow polarity to three terminals of a star connection or a delta connection.