Electricity: motive power systems – Positional servo systems – Multiple mode systems
Patent
1989-09-08
1991-01-01
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
Multiple mode systems
318596, 318609, 318799, 318561, 363 96, 388810, 388813, G05B 1116, G05B 1136
Patent
active
049821458
ABSTRACT:
A digital current control arrangement for optimizing the transport time delay of a thyristor power supply used as a source of armature current for a DC motor utilizes a coarse gate angle interrupt subroutine to perform a preliminary calculation of the gate firing angle for the next thyristor to be fired. The coarse gate angle calculation is performed at a predetermined time following the firing of a previous thyristor. A finite gate angle interrupt subroutine is also provided for recalculating the gate firing angle at a second predetermined time just prior to the firing of the thyristor. The finite and coarse gate angle interrupt subroutines both perform their respective calculations using the common parameters. A flag passing arrangement is also included in the current control arrangement and is effective to insure that the finite gate firing angle is the preferred calculation used in the firing of the next thyristor.
REFERENCES:
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patent: 4710692 (1987-12-01), Libert et al.
patent: 4806836 (1989-02-01), Webb
AEG Westinghouse Industrial Automation Corporation
Kikel Suzanne
Ro Bentsu
Westerhoff Richard V.
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