exported
necessary
stator
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Stator
Generated on 2026-05-04
Natural Language Definition
EN
A MaterialArtifact that bears a StationaryMachineComponentFunction and that is the stationary structural component within rotating machinery, providing housing and positional stability for active elements such as windings, vanes, or seals.
PT-BR
Um MaterialArtifact que possui uma StationaryMachineComponentFunction e que é o componente estrutural estacionário dentro de máquinas rotativas, fornecendo alojamento e estabilidade posicional para elementos ativos como bobinas, palhetas ou vedações.
Formal Axioms
Semi-formal (Aristotelian)
Every Stator is a MaterialArtifact that bears a StationaryMachineComponentFunction and is part of some RotatingMachine
First-Order Logic Theory
Loading…
▸ Stored override
∀x(Stator(x) → MaterialArtifact(x) ∧ ∃f(StationaryMachineComponentFunction(f) ∧ bearerOf(x,f)) ∧ ∃m(RotatingMachine(m) ∧ partOf(x,m)))
OWL 2 / Turtle
@prefix copi: <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix : <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix bfo: <http://purl.obolibrary.org/obo/> .
@prefix iof-core: <https://spec.industrialontologies.org/ontology/construct/> .
@prefix iof-av: <https://spec.industrialontologies.org/ontology/annotation/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix apv: <http://inf.ufrgs.br/ontologies/apv#> .
### COPI — Core Ontology for Petroleum Installations
### Class module: Stator
<https://www.inf.ufrgs.br/ontologies/copi>
rdf:type owl:Ontology ;
dcterms:title "Core Ontology for Petroleum Installations (COPI)"@en ;
dcterms:title "Ontologia Core para Instalações de Petróleo (COPI)"@pt-br ;
dcterms:description "BFO/IOF-Core conformant ontology of equipment classes for petroleum production plants, developed using the five-step RDL enrichment method."@en ;
skos:scopeNote "Material artifacts (bfo:material_entity) that (i) are part of a petroleum production plant, and (ii) bear at least one function whose realization involves the transport (e.g. production and injection), processing (separation and other processes), control, monitoring, measurement, containment or offloading of material or energy."@en ;
skos:scopeNote "Artefatos materiais (bfo:material_entity) que (i) fazem parte de uma planta de produção de petróleo, e (ii) possuem ao menos uma função cuja realização envolve o transporte (p. ex. produção e injeção), processamento (separação e outros processos), controle, monitoramento, medição, contenção ou escoamento de material ou energia."@pt-br ;
skos:scopeNote "COPI provides high-level equipment categories defined by function to demonstrate the defined-class mechanism. Equipment subtypes are annotated with references to CFIHOS and PCA RDL terms. COPI is not a reference data library; organizations should use CFIHOS, PCA RDL, or ISO 14224 for comprehensive equipment classification."@en ;
skos:scopeNote "COPI fornece categorias de alto nível de equipamentos definidas por função para demonstrar o mecanismo de classe definida. Os subtipos de equipamentos são anotados com referências aos termos do CFIHOS e do PCA RDL. COPI não é uma biblioteca de dados de referência; organizações devem utilizar o CFIHOS, o PCA RDL ou a ISO 14224 para classificação abrangente de equipamentos."@pt-br ;
owl:versionInfo "1.1.0" ;
owl:imports <https://spec.industrialontologies.org/ontology/core/Core/> ;
owl:imports <http://purl.obolibrary.org/obo/bfo/2020/bfo.owl> ;
dcterms:creator "Nicolau Oyhenard dos Santos"@en ;
dcterms:contributor "Cauã Antunes" ;
dcterms:contributor "Haroldo Rojas" ;
dcterms:contributor "Rafael Petry" ;
dcterms:contributor "Régis Romeu" ;
dcterms:contributor "Mara Abel" ;
dcterms:isPartOf <https://inf.ufrgs.br/projetos/OntoKG> ;
dcterms:publisher "Universidade Federal do Rio Grande do Sul (UFRGS)"@en ;
dcterms:license <https://creativecommons.org/licenses/by/4.0/> ;
dcterms:created "2026-04-08"^^xsd:date ;
dcterms:modified "2026-10-07"^^xsd:date ;
apv:GlobalMinLanguageCoverage "en pt-br" ;
apv:ClassURIFormationRule "https://www[.]inf[.]ufrgs[.]br/ontologies/copi/(COPI_[0-9]{7}|[A-Z][A-Za-z0-9]*)" ;
apv:ClassMinAnnotationCoverage "rdfs:label https://spec.industrialontologies.org/ontology/annotation/naturalLanguageDefinition" .
iof-av:naturalLanguageDefinition rdf:type owl:AnnotationProperty ;
apv:MinAnnotationLength 20 .
### Identity-giving function
:COPI_0000648 rdf:type owl:Class ; # StationaryMachineComponentFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000649 # StationaryMachineComponentProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000649 # StationaryMachineComponentProcess
] ;
rdfs:label "stationary machine component function"@en ;
rdfs:label "função de componente estacionário de máquina"@pt-br ;
iof-av:naturalLanguageDefinition "A DesignedFunction that is realized in a StationaryMachineComponentProcess and that consists in providing a stationary structural foundation and housing for active elements (such as windings, vanes, or seals) within rotating machinery, maintaining positional stability relative to moving components."@en ;
skos:definition "A DesignedFunction that is realized in a StationaryMachineComponentProcess and that consists in providing a stationary structural foundation and housing for active elements (such as windings, vanes, or seals) within rotating machinery, maintaining positional stability relative to moving components."@en .
### Process type
:COPI_0000649 rdf:type owl:Class ; # StationaryMachineComponentProcess
rdfs:subClassOf iof-core:PlannedProcess ;
rdfs:label "stationary machine component process"@en ;
rdfs:label "processo de componente estacionário de máquina"@pt-br ;
iof-av:naturalLanguageDefinition "A PlannedProcess in which a stator maintains its fixed position relative to rotating components within machinery, providing structural support and housing for electromagnetic windings, guide vanes, or other functional elements that require stable positioning."@en ;
skos:definition "A PlannedProcess in which a stator maintains its fixed position relative to rotating components within machinery, providing structural support and housing for electromagnetic windings, guide vanes, or other functional elements that require stable positioning."@en .
### Equipment universal: Stator
:COPI_0000355 rdf:type owl:Class ; # Stator
rdfs:subClassOf iof-core:MaterialArtifact ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000648 # StationaryMachineComponentFunction
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasComponentPartAtSomeTime ;
owl:someValuesFrom :COPI_0000731 # StatorWinding
] ;
rdfs:label "stator"@en ;
rdfs:label "MaterialArtifact que possui uma StationaryMachineComponentFunction e"@pt-br ;
iof-av:naturalLanguageDefinition "A MaterialArtifact that bears a StationaryMachineComponentFunction and that is the stationary structural component within rotating machinery, providing housing and positional stability for active elements such as windings, vanes, or seals."@en ;
skos:definition "A MaterialArtifact that bears a StationaryMachineComponentFunction and that is the stationary structural component within rotating machinery, providing housing and positional stability for active elements such as windings, vanes, or seals."@en ;
iof-av:naturalLanguageDefinition "Um MaterialArtifact que possui uma StationaryMachineComponentFunction e que é o componente estrutural estacionário dentro de máquinas rotativas, fornecendo alojamento e estabilidade posicional para elementos ativos como bobinas, palhetas ou vedações."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every Stator is a MaterialArtifact that bears a StationaryMachineComponentFunction and is part of some RotatingMachine"@en ;
iof-av:firstOrderLogicAxiom "∀x(Stator(x) → MaterialArtifact(x) ∧ ∃f(StationaryMachineComponentFunction(f) ∧ bearerOf(x,f)) ∧ ∃m(RotatingMachine(m) ∧ partOf(x,m)))"@en ;
iof-av:isPrimitive "true"^^xsd:boolean ;
iof-av:primitiveRationale "Constructive classification based on structural positioning within rotating machinery. Under OWA, any artifact described as stationary within a rotating machine context could be classified as a stator, but this may include specialized hybrid components, mounting structures, or custom configurations that should not be automatically asserted into the standard stator maintenance category. The structural differentia (stationary positioning) is necessary but making it sufficient requires domain expert validation."@en ;
skos:definition "[ISO 15926-4] A <STATOR> is a <MACHINE COMPONENT> that is the arrangement of primary coils being the stator winding and being the stationary part of a machine"@en ;
skos:definition "[OnePetro] In the context of a PDM motor, a stator is the stationary rubber element of a PDM motor."@en .
:COPI_0000731 rdf:type owl:Class ; # StatorWinding
rdfs:subClassOf iof-core:MaterialArtifact ;
rdfs:label "enrolamento do estator"@pt-br ;
rdfs:label "stator winding"@en .
Axiomatization Decision Log
1
Identity-Giving Function
Function class
StationaryMachineComponentFunction
⊑ DesignedFunction
Realized in
StationaryMachineComponentProcess
⊑ PlannedProcess
The function captures the essential role of a stator as the stationary counterpart in rotating machinery. While stators may contain different functional elements (electromagnetic windings, guide vanes, seals), their identity-giving function is providing the stable, non-rotating foundation that enables the machine's operation.
2
Genus Determination
MaterialArtifact
bfo:Object (BFO_0000030)
Monolithic causally unified material artefact.
MaterialArtifact ≡ Object ⊓ ∃bearerOf.DesignedFunction.
No specific machine component superclass exists in the parent_candidates. A stator is a causally unified engineered component that forms part of a larger machine assembly. It has a single maintainable boundary and is designed to bear specific functions within rotating machinery. MaterialArtifact is the most appropriate BFO root since stators are typically monolithic or tightly integrated components rather than assemblies of removable parts.
3
Necessary Parts
| Part class | Parent | Relation |
|---|---|---|
| StatorWinding | MaterialArtifact | hasComponentPartAtSomeTime |
The sources show significant variation in stator types. Electrical stators have windings, PDM motor stators are rubber elements, and turbomachinery stators have vanes. Only stator winding appears as a universal component term, but even this applies mainly to electrical machines. No single part is universal to all stator types, reflecting the constructive nature of this classification.
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
—
Outputs (O)
—
Transformation (T)
structural positioning and housing provision within rotating machinery without direct fluid or energy transformation
Stators are passive structural components that do not directly process fluids or energy streams. They provide containment and structural support for active elements (windings, vanes) that perform the actual transformations. The signature reflects this passive structural role with no direct input/output streams.
5
Axiom Mode Decision
Necessary conditions only
— modelled as a primitive universal
(⊑, SubClassOf). Identity is grounded in designed
function and cannot be reduced to a property checklist.
Constructive classification based on structural positioning within rotating machinery. Under OWA, any artifact described as stationary within a rotating machine context could be classified as a stator, but this may include specialized hybrid components, mounting structures, or custom configurations that should not be automatically asserted into the standard stator maintenance category. The structural differentia (stationary positioning) is necessary but making it sufficient requires domain expert validation.
Cross-Standard Observations
The concept shows material-dependent implementations: electromagnetic (ISO 15926-4 electrical focus) versus mechanical/sealing (OnePetro PDM motor focus). Both sources agree on the fundamental positional characteristic (stationary vs rotating) but differ in the specific functional elements housed within the stator structure.
