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Control Structure of Variable Rotational Speed Hydraulic System

JI Fang-lin

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Abstract

Four control structures,constant voltage-frequency ratio ( U/f ) open loop control, vector closed loop control,load pressure compensation control and speed feedback compensation control,were summarized.To the great inertia variable rotational speed hydraulic system,three new compounded compensation control structures,feedback combined with load feedforward,feedback combined with input feedforward,feedback combined with load feedward and input feedforward were put forward.These compounded compensation control can enhance the control characteristics of the great inertia variable rotational speed hydraulic system.

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What this paper is about

Four control structures,constant voltage-frequency ratio ( U/f ) open loop control, vector closed loop control,load pressure compensation control and speed feedback compensation control,were summarized.To the great inertia variable rotational speed hydraulic system,three new compounded compensation control structures,feedback combined with load feedforward,feedback combined with input feedforward,feedback combined with load feedward and input feedforward were put forward.These compounded compensation control can enhance the control characteristics of the great inertia variable rotational speed hydraulic system.

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Available abstract

Four control structures,constant voltage-frequency ratio ( U/f ) open loop control, vector closed loop control,load pressure compensation control and speed feedback compensation control,were summarized.To the great inertia variable rotational speed hydraulic system,three new compounded compensation control structures,feedback combined with load feedforward,feedback combined with input feedforward,feedback combined with load feedward and input feedforward were put forward.These compounded compensation control can enhance the control characteristics of the great inertia variable rotational speed hydraulic system.

Key concepts: Feed forward, Control theory (sociology), Rotational speed, Inertia, Compensation (psychology), Control system, Engineering, Electronic speed control

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