Simplified sensorless DC motor commutation control circuit using

Details Simplified sensorless DC motor commutation control circuit using Simplified sensorless DC motor commutation control circuit using

1991-11-01

1993-08-03

Wysocki, Jonathan

Electricity: motive power systems

Switched reluctance motor commutation control

318439, 318138, H02P 700

Patent

active

052332756

ABSTRACT:
Initial start-up of a polyphase, brushless DC motor (used for a hard disk drive system) is accomplished by sequentially applying current to each of the phases of the motor. When a back EMF zero-crossing is detected in one of the phases of the motor, after an appropriate delay to allow the next phase to come into position, current is applied to that phase. Thus, the position of the rotor is determined from the back EMF zero-crossing of the phase to which power is currently being supplied. A delay proportional to the speed of the motor is used between the detection of a back EMF zero-crossing and the powering of the next phase in sequence. A disk drive motor is brought up to its operating speed of 3600 or 5400 rpm's in successive stages with (1) an initial relatively slow energization of the stator coils (2) zero-crossing detection with a relatively long delay and masking of spurious signals, (3) zero-crossing detection with shorter delay and masking times, and (4) maintaining the rotational speed of disks at the appropriate operating speed using any of various methods commonly known and employed by those of ordinary skill.

REFERENCES:
patent: 4274993 (1989-10-01), Tanaka et al.
patent: 4585982 (1986-04-01), Cooper et al.
patent: 4743815 (1988-05-01), Gee et al.
patent: 4833386 (1989-05-01), Unsworth
patent: 4876491 (1989-10-01), Squires et al.
patent: 5014756 (1991-05-01), Schwarz
patent: 5057753 (1991-10-01), Leuthold et al.

Affiliated with

Also associated with

Rating

Simplified sensorless DC motor commutation control circuit using does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Simplified sensorless DC motor commutation control circuit using, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simplified sensorless DC motor commutation control circuit using will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2273644