Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Running-speed control
Patent
1992-02-20
1993-03-02
Ro, Bentsu
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Running-speed control
318 77, 198778, 198952, 62381, H02P 546, B65G 2118, F25D 2504
Patent
active
051912678
ABSTRACT:
A spiral drum freezer apparatus having a system for measuring and monitoring the "overdrive" of a rotated drum relative to a spiral belt helically wrapped around the drum in an ascending fashion. The system measures overdrive directly and continuously by obtaining a first speed measurement of the drum directly from the sprockets of a drive gear box drivingly engaging the drum. An alternative point of measurement for measuring rotational speed includes proximate the sprockets of a drum wheel driven by a belt, or sensing spaced-apart vertical outer structure members of the drum. Another point yet is on a disc-like plate. This plate is coaxially aligned and attached to the drum, and has precisionally spaced apart markings proximate a periphery where the rotational speed of the plate is directly proportional to the rotational speed of the drum. A second speed measurement is obtained by measuring the rotational speed of sprockets of a guide roller guiding the spiral belt. The second speed measurement can also be obtained by sensing evenly spaced markings on the spiral belt. A moving window averaging scheme is used to obtain a reliable and accurate measurement of the speed of the drum and the guideroller. A processor calculates overdrive and generates a readout continuously of the overdrive as a function of the first and second speed measurements.
REFERENCES:
patent: 4126817 (1978-11-01), Luzio
patent: 4363457 (1982-12-01), Flint et al.
patent: 4513229 (1985-04-01), Kudelski
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