Electricity: motive power systems – Positional servo systems – Frequency- or phase-modulated systems
Patent
1991-12-30
1994-02-08
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Frequency- or phase-modulated systems
318799, 318809, 388801, 388813, H02P 800
Patent
active
052851419
ABSTRACT:
A circuit for controlling the velocity of the spindle motor in an electronic device using a disk is disclosed. Particularly, an abnormal rotation preventing circuit is disclosed which monitors the angular velocity of the spindle motor and forcibly controlls it to rotate within a predetermined velocity range when it deviates from the predetermined range. The duty value of a phase difference between two signals among first, second and third phase control signals for driving a three-phase motor is measured. Then, the phase difference is counted and the velocity is sampled. An abnormal rotation control signal is generated when the sampled velocity deviates from the predetermined range. The motor's velocity is then forcibly controlled so as not to deviate from the predetermined range, thereby preventing abnormal rotation of the motor.
REFERENCES:
patent: 3893169 (1975-07-01), Hall, Jr.
patent: 4423440 (1983-12-01), Tachi
patent: 4467320 (1984-08-01), McPhee
patent: 4555734 (1985-11-01), Fukui
patent: 4614981 (1986-09-01), Fukui
patent: 4623939 (1986-11-01), Machida et al.
patent: 4675855 (1987-06-01), Iso et al.
patent: 4739230 (1988-04-01), Sonobe et al.
patent: 4748608 (1988-05-01), Matsumoto et al.
patent: 4763205 (1988-08-01), Okano
patent: 4815063 (1989-03-01), Aoshima et al.
patent: 4823203 (1989-04-01), Narusawa
patent: 4835632 (1989-05-01), Shih et al.
patent: 4855847 (1989-08-01), Kanamaru
patent: 4855978 (1989-08-01), Kanamaru
patent: 4885644 (1989-12-01), Ishii et al.
patent: 4908810 (1990-03-01), Oie
patent: 4933774 (1990-06-01), Ishimaru
patent: 4947264 (1990-08-01), Narusawa
patent: 5027048 (1991-06-01), Masrur et al.
patent: 5051674 (1991-09-01), Kim
Bushnell Robert E.
Samsung Electronics Co,. Ltd.
Shoop Jr. William M.
Sircus Brian
LandOfFree
Circuit for preventing abnormal rotation of a spindle motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit for preventing abnormal rotation of a spindle motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for preventing abnormal rotation of a spindle motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-700578