Seek method and apparatus

Details Seek method and apparatus Seek method and apparatus

1994-03-31

1996-08-13

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 318138, 318439, 318254, 360 7813, H02P 800

Patent

active

055459633

ABSTRACT:
A seek method and an apparatus using a stepping motor, which can eliminate disadvantages of the two-phase excitation (large seek noise and great power consumption) while maintaining advantages of the two-phase excitation (large torque and high stop accuracy). A stepping motor is driven by two-phase exciting signals, each of which includes a short term one-phase excitation state whose duration is shorter than a pulse interval of a step pulse train. The one-phase excitation state is inserted between two consecutive two-phase excitation states. A two-phase exciting signal associated with a start or a change in seek direction may exclude the one-phase excitation state so that the stepping motor can produce large torque.

REFERENCES:
patent: 4540927 (1985-09-01), Tanimoto
patent: 4567418 (1986-01-01), Takemoto et al.
patent: 4812727 (1989-03-01), Sakai et al.
patent: 4857817 (1989-08-01), Kugioka
patent: 5084661 (1992-01-01), Tanaka
patent: 5157515 (1992-10-01), Hasegawa
patent: 5175482 (1992-12-01), DeGuchi

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