Electricity: motive power systems – Positional servo systems
Reexamination Certificate
1999-07-20
2001-04-17
Donels, Jeffrey (Department: 2837)
Electricity: motive power systems
Positional servo systems
C318S561000, C318S600000, C318S601000, C318S632000
Reexamination Certificate
active
06218800
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a control system for a motor driven system.
The invention also relates to a driving system including the control system.
The invention further relates to an apparatus for storing and/or reproducing information, which apparatus includes the driving system.
The invention further relates to a method of controlling a motor in driving system.
BACKGROUND OF THE INVENTION
Such a control method, driving system, apparatus and method are known from WO 97/23873 hereby incorporated in whole by reference. In the driving system described therein the first and the second position signal are each generated by a Hall sensor. Furthermore, an inverted position signal is derived from each of the position signals. By means of the two position signals and one of the inverted signals a status generator generates a status signal, which is applied to a multiplexer. The multiplexer also receives the two position signals and the two inverted position signals. Depending on the status signal the multiplexer transfers one of the inverted or non-inverted position signals to its output. The signal thus obtained on the output of the multiplexer is sawtooth-shaped. The reference means are adapted to compensate for abrupt changes in the output signal of the multiplexer by a corresponding variation of the reference signal. This results in a uniform drive of the motor.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a control system, a driving system, a method and an apparatus for storing and/or re producing information of the types defined hereinbefore in which such a compensation is not required.
In accordance with the invention the position signals are used at the same time in order to calculate the error signal. This makes it possible to calculate an error signal which, regardless of the instantaneous value of the position, is always a monotonic function of the difference between the instantaneous value and the desired value of the position. As a result of this, compensation of the reference signal is not necessary.
REFERENCES:
patent: 4330880 (1982-05-01), Van Dijk
patent: 5321676 (1994-06-01), Van Velthoven et al.
patent: 5636193 (1997-06-01), Ohmi
patent: 0508522A2 (1992-10-01), None
patent: WO/9723873 (1997-07-01), None
patent: WO97/23873 (1997-07-01), None
Akkermans Antonius H. M.
Hezemans Cornelius A.
Belk Michael E.
Donels Jeffrey
Leykin Rita
U.S. Philips Corporation
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