Rotational position detector and recording-reproducing unit...

Details Rotational position detector and recording-reproducing unit... Rotational position detector and recording-reproducing unit...

2006-12-05

2006-12-05

Aurora, Reena (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S173000

Reexamination Certificate

active

07145327

ABSTRACT:
A rotor of a sensor-less motor has a multiplicity of magnetic poles, with one magnetic pole giving a smaller magnetic flux than other the magnetic poles. A coil is provided at a predetermined position external to the rotor. An induction signal is generated in the coil as the magnetic flux through it is changed by the rotation of the rotor. An index signal indicative of the reference rotational position of the rotor is generated based on the change in the induction signal. Thus, the reference rotational position of the disk of an information recording-reproducing unit, for example, can be detected without utilizing any Hall elements.

REFERENCES:
patent: 5349257 (1994-09-01), Hernden
patent: 02-010569 (1990-01-01), None

Affiliated with

Also associated with

Rating

Rotational position detector and recording-reproducing unit... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rotational position detector and recording-reproducing unit..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotational position detector and recording-reproducing unit... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3718917