Electricity: motive power systems – Plural diverse motor controls – Running-speed control
Reexamination Certificate
2008-01-29
2008-01-29
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Plural diverse motor controls
Running-speed control
C388S907500, C318S244000, C318S245000, C318S132000, C318S254100, C318S434000, C318S720000, C318S721000, C318S722000, C318S723000, C318S724000, C318S685000, C318S696000, C318S701000
Reexamination Certificate
active
07323839
ABSTRACT:
A direct current motor controlling method includes a mean for transforming a duty signal to computed value by a microprocessor unit. The microprocessor unit computes the computed value and then produces a target value by executing a dichotomy method, a rotation method and a transformed function, capable of reducing executing time and executing load of the microprocessor unit and saving memory space. The microprocessor unit sends a frequency signal to a driving circuit unit according to the target value. The driving circuit unit receives the frequency signal and then provides a driving voltage to a power switch. The power switch provides a voltage to a direct current motor or not according to the driving voltage for controlling output performance of the direct current motor.
REFERENCES:
patent: 4638225 (1987-01-01), Morinaga et al.
patent: 4841207 (1989-06-01), Cheyne
patent: 5801504 (1998-09-01), Endo et al.
patent: 5825972 (1998-10-01), Brown
patent: 2006/0049784 (2006-03-01), Suzuki
Brandt Michael
Cheng Uei Precision Industry Co. Ltd.
Donovan Lincoln
Rosenberg , Klein & Lee
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