Phase-lock control device
AssigneeHitachi, Ltd.
InventorsTakashi Furuhata, Yasunori Kobori
Life of this patent
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Abstract
A control device for phase-locking a rotating or traveling member to a reference signal within a short time at its starting stage, in which a phasic error signal produced as a result of comparison of the phases of the reference signal and a signal representative of the phasic position of the member is fed to the driver of the member through a gate which is non-conductive unless the speed of motion of the member reaches a predetermined value.
Claims9
A control device for phase-locking a rotating member or a traveling member driven by driving means to a reference signal within a short time at the starting state of the member, comprising:
- means associated with said member for producing a phase detection signal representative of the phasic position of said member;
- a phase comparator for comparing the phases of said reference signal and said phase detection signal to produce a phasic error signal depending on the result of the comparison;
- means for producing a control signal indicative of whether the speed of said member reaches a predetermined value;
- and
- switching means connected with said phase comparator for feeding said phasic error signal through said switching means to said driving means, said switching means being rendered conductive to enable passage of said phasic error signal therethrough or non-conductive to inhibit the passage of said phasic error signal therethrough in response to said control signal so that said phasic error signal is fed to said driving means only after the speed of motion of said member reaches a predetermined value.
Dependencies are inferred from the claim text.