Voltage mode drive of servo system
AssigneeTektronix, Inc.
InventorsEdward F. Burke, David L. Knierim
Life of this patent
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Abstract
A voltage mode drive for a servo system builds a drive matrix from an error signal, which is the difference between a measured value for a parameter of the servo system, such as the position of a rotating drum, and a reference signal, a voltage control signal for the servo system, and an estimated set of parameters for the servo system, the parameters including drive current. The outputs from the drive matrix are a new estimated set of parameters for the servo system which are multiplied by appropriate system constants to produce the voltage control signal. The voltage control signal is amplified by a voltage amplifier and applied to drive the servo system.
Claims9
A method of voltage mode driving a servo system comprising the steps of:
- measuring an instantaneous parameter for the servo system;
- estimating a set of parameters for the servo system, one of the parameters being current, as a function of a prior estimated set of parameters, a voltage control signal, the instantaneous parameter, and a reference signal;
- generating from the estimated set of parameters for the servo system the voltage control signal for driving the servo system;
- voltage amplifying the voltage control signal before application for driving the servo system.
A voltage mode driven servo system comprising:
- means for measuring an instanteous parameter for the servo system;
- means for estimating a set of parameters for the servo system, the parameters including current, as a function of the instantaneous parameters, a reference signal, a voltage control signal and a prior estimated set of parameters;
- means for generating from the estimated set of parameters the voltage control signal;
- and
- a voltage amplifier coupled to the generating means for amplifying the voltage control signal before applying the voltage control signal to the servo system.
A method of voltage mode driving a servo system comprising the steps of:
- determining an error signal from a measured parameter of the servo system and a reference signal;
- and
- infinite impulse response filtering the error signal to produce a voltage control signal for driving the servo system, the coefficients upon which the infinite impulse response filtering is based being derived from an error-based estimator model for the servo system.
Dependencies are inferred from the claim text.