IEC PAS 62072-2005 PDF

Full title and description

IEC/PAS 62072:2005 — Natural graphite brush for rotating electrical machinery — Basic characteristics. This Publicly Available Specification (PAS) defines the basic physical and operating characteristics, recommended operating conditions and test methods for natural graphite brushes used on commutators and slip-rings in rotating electrical machinery.

Abstract

IEC/PAS 62072:2005 establishes classification, key physical properties (bulk density, hardness, resistivity, bending strength, ash content), operating characteristics (total voltage drop, coefficient of friction), recommended service conditions (peripheral velocity, current density, brush pressure) and associated test methods for natural graphite brushes for commutators and slip-rings. Published as a PAS (first edition) in 2005, the document was later withdrawn by the IEC. The specification includes informative annexes on measurement and performance characteristics, manufacturing processes, comparative physical-property data and environmental pollution considerations.

General information

• Status: Withdrawn (withdrawal date: 30 June 2009).
• Publication date: 17 January 2005.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 29.160.01 — Rotating machinery in general.
• Edition / version: 1.0 (First edition, PAS).
• Number of pages: 12.

Scope

This PAS applies to natural graphite brushes intended for use in rotating electrical machinery on commutators and slip-rings. It covers classification, basic physical and electrical characteristics, recommended operating conditions and test methods. The specification explicitly excludes brushes for certain special applications (for example: small appliance starters for automotive/tractor applications, micro-appliances for household tools, aviation/space applications and other brushes operating under special or atypical conditions).

Key topics and requirements

• Classification of natural graphite brushes by type and intended application.
• Physical property requirements and testable limits: bulk density, hardness, resistivity, bending strength and ash content.
• Operating characteristics: total voltage drop and coefficient of friction under specified conditions.
• Recommended operating ranges: peripheral velocity, allowable current density and brush pressure guidelines.
• Specified test methods for verifying physical and operating characteristics, including measurement procedures and sample preparation.
• Informative annexes: measurement/performance data, typical manufacturing processes, comparative property tables and considerations for environmental pollution.
• Guidance intended to support selection, quality control and interchangeability of natural graphite brushes for rotating machines.

Typical use and users

Primary users are brush manufacturers, motor and generator designers, maintenance and reliability engineers, test laboratories and procurement/specification teams in industries using rotating electrical machinery (industrial motors, generators, traction motors, and similar equipment). The PAS is useful as a reference for product specification, incoming inspection and laboratory testing of natural graphite brushes.

Related standards

Standards commonly referenced with or relevant to this PAS include: IEC 60773 (test methods and apparatus for measurement of operational characteristics of brushes), IEC 60136 (dimensions of brushes and brush-holders for electrical machinery), the IEC 60034 series (rotating electrical machines — general requirements and test procedures) and national/adopted specifications for brush materials and manufacturing quality. Users should also consult applicable national regulations and product standards for specific applications (e.g., traction, aerospace or automotive), and supplier quality system standards for manufacturing controls.

Keywords

natural graphite brush, commutator brush, slip-ring brush, rotating electrical machinery, brush characteristics, brush test methods, brush classification, voltage drop, coefficient of friction, current density, brush pressure

FAQ

Q: What is this standard?

A: IEC/PAS 62072:2005 is a Publicly Available Specification that sets out basic characteristics, recommended operating conditions and test methods for natural graphite brushes used on commutators and slip-rings in rotating electrical machinery.

Q: What does it cover?

A: The document covers classification, physical properties (bulk density, hardness, resistivity, bending strength, ash), operating characteristics (total voltage drop, coefficient of friction), recommended service conditions (peripheral velocity, current density, brush pressure) and test methods, plus informative annexes on measurement, manufacture and environmental issues.

Q: Who typically uses it?

A: Brush and component manufacturers, motor/generator designers, maintenance and reliability engineers, test laboratories and procurement/specification teams for rotating machinery.

Q: Is it current or superseded?

A: IEC/PAS 62072:2005 was withdrawn by the IEC (withdrawal date 30 June 2009). The IEC publication record shows it as withdrawn; users should check current IEC catalogue entries or national-adopted standards for any replacement or newer normative documents applicable to graphite brushes.

Q: Is it part of a series?

A: The document was published as an IEC PAS (Publicly Available Specification) and relates to other IEC publications on brushes and rotating machines (for example IEC 60773 and IEC 60136). It is not a numbered part of a single multipart series but sits within the IEC work of Technical Committee TC 2 (Rotating machinery).

Q: What are the key keywords?

A: Natural graphite brush, commutator brush, slip-ring brush, brush characteristics, brush test methods, rotating electrical machinery.