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. 30, 1999
Filed:
Dec. 17, 1997
Sung Cheon Jung, Seoul, KR;
Samsung Electro-Mechanics Co. Ltd., Suwon, KR;
Abstract
A brushless DC motor is disclosed. In the motor, an axial vibration limit unit is provided on a bearing and electromagnetically attracts a rotor, thus preventing the rotor from being centrifugally lifted during a high speed rotation of the rotor. In the operation of the motor, an axial displacement of the rotor is sensed by an induction coil of a sensor. The induction coil generates a variable induction current indicative of an axial displacement of the rotor, and outputs the current to a controller through an amplifier, thus controlling the vibration limit unit. The electromagnetic bearing of this invention thus supports the shaft and rotor in an axial direction and almost completely prevents any axial vibrations of the rotor, thereby reducing operational vibrations and noises and improving the axial dynamic characteristics of the brushless DC motor.