Alexander M D'Anci

US Patent:

45918317, May 27, 1986

Filed:

May 8, 1984

Appl. No.:

6/608128

Inventors:

Alexander D'Anci - Springvale ME

Assignee:

Intelligent Controls, Inc. - Saco ME

International Classification:

G05F 1153
H02J 312
H03M 728

US Classification:

340347SY

Abstract:

A position angle transducer for voltage compensating tap changing transformers provides secondary tap number or tap position analog output signals which accurately reflect the secondary tap position even if a non-linear relationship obtains between the shaft angle and tap number. A shaft angle sensor generates shaft angle analog signals and an analog-to-digital converter converts the shaft angle analog signals to shaft angle digital words. A digital-to-digital converter receives the shaft angle digital words and provides at its output tap number digital words according to the transfer function or functional relationship of tap changing shaft angle to tap number for the particular transformer. A programmable read-only memory performs the digital-to-digital conversion and is flexibly programmed according to the transfer function of the transformer and in order to establish any desired transfer functional relationship. The tap number digital words may then be converted to tap number analog signals at the output truly representative of the secondary tap position for input to a utility company SCADA System.

US Patent:

47622920, Aug 9, 1988

Filed:

Jan 30, 1987

Appl. No.:

7/009147

Inventors:

Alexander M. D'Anci - Springvale ME

International Classification:

G11B 1506
G01N 2186

US Classification:

242184

Abstract:

A web loop position sensing system detects the position of web material, such as magnetic tape, in a vacuum column by using light emitters and receptors arranged along an array outside the vacuum column. The light emitters direct light towards a retroreflective surface formed of glass bead tape on an interior side of the vacuum column. Light reflected by the glass bead tape is received by the light receptors in the array. The quantity of light received by the light receptors is detected and used to control a supply reel in a tape transport in which the vacuum column is used, thereby maintaining the web loop tension within the vacuum column.