Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1990-04-18
1991-08-20
Shoop, Jr., William M.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, 318254, 323315, 3072961, 360 7708, H02P 800
Patent
active
050417738
ABSTRACT:
A drive circuit for a stepping motor which seeks the read/write head of an FDD or the like to a predetermined track. The drive circuit includes a plurality of exciting coils for providing exciting fields to a rotor and supplies exciting currents in the forward or reverse direction by a predetermined combination to each of the exciting coils. A constant-current circuit is provided so as to cause the exciting current flowing on each exciting coil to have a constant value. The constant-current circuit includes a current mirror circuit with the slave branch connected to the exciting coils and the master branch contained in the constant-current circuit. The constant-current circuit further includes a constant-current source for supplying a constant current to the master branch of the current mirror circuit and a constant-current setting circuit for setting the constant current as desired.
By making the currents flowing on the exciting coils uniform, the seeking positional accuracy of the read/write head is improved.
REFERENCES:
patent: 4057743 (1977-11-01), Limberg
patent: 4140960 (1979-02-01), Ohsawa
patent: 4338551 (1982-07-01), Mizumoto
patent: 4358720 (1982-11-01), Abe
patent: 4651269 (1987-03-01), Matsumura
patent: 4961046 (1990-10-01), De Jager
C. J. Savant et al., "Electronic Circuit Design", Benjamin/Cummings Publishing Company, Inc., 1987; pp. 303-304.
Bergmann Saul M.
Citiaen Watch Co., Ltd.
Shoop Jr. William M.
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