{"id":374777,"date":"2024-10-20T02:40:18","date_gmt":"2024-10-20T02:40:18","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iec-607732021\/"},"modified":"2024-10-26T04:39:33","modified_gmt":"2024-10-26T04:39:33","slug":"bs-en-iec-607732021","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iec-607732021\/","title":{"rendered":"BS EN IEC 60773:2021"},"content":{"rendered":"

This document applies to test methods for the measurement of the operational characteristics of brushes designed to operate on commutating and slip ring machines under specified test conditions. By extension some tests may be relevant for other kinds of sliding electrical contacts for electrical appliances.<\/p>\n

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2<\/td>\nundefined <\/td>\n<\/tr>\n
5<\/td>\nAnnex ZA(normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n
7<\/td>\nEnglish
CONTENTS <\/td>\n<\/tr>\n
11<\/td>\nFOREWORD <\/td>\n<\/tr>\n
13<\/td>\n1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms <\/td>\n<\/tr>\n
14<\/td>\n3.1 Terms and definitions
Figures
Figure 1 \u2013 Profile and determination of height of profile elements <\/td>\n<\/tr>\n
17<\/td>\nFigure 2 \u2013 Forces acting on a brush
Figure 3 \u2013 Voltage drops in a brush when in operation <\/td>\n<\/tr>\n
20<\/td>\n3.2 Symbols
3.2.1 Symbols and units <\/td>\n<\/tr>\n
21<\/td>\n3.2.2 Subscripts <\/td>\n<\/tr>\n
22<\/td>\n3.3 Abbreviated terms <\/td>\n<\/tr>\n
23<\/td>\n4 Test rig specification
4.1 Common specification
4.1.1 General
4.1.2 Rings <\/td>\n<\/tr>\n
24<\/td>\n4.1.3 Brushes
4.1.4 Brush holders
Table 1 \u2013 Dimensions of test brushes <\/td>\n<\/tr>\n
25<\/td>\nFigure 4 \u2013 Brush holder configuration <\/td>\n<\/tr>\n
26<\/td>\n4.1.5 Power supply
4.1.6 Instrumentation <\/td>\n<\/tr>\n
27<\/td>\nFigure 5 \u2013 Measurement of the mechanical torque by Method a) <\/td>\n<\/tr>\n
28<\/td>\nFigure 6 \u2013 Brush test machine for Method b) <\/td>\n<\/tr>\n
29<\/td>\nFigure 7 \u2013 Test rig arrangement with a load cell <\/td>\n<\/tr>\n
32<\/td>\nFigure 8 \u2013 Brush contact probe application point for Uc <\/td>\n<\/tr>\n
33<\/td>\nFigure 9 \u2013 Thermocouples insertion position <\/td>\n<\/tr>\n
34<\/td>\nFigure 10 \u2013 Evaluation of contact temperature (c by interpolation <\/td>\n<\/tr>\n
36<\/td>\n4.2 Test rig specification for commutators
4.2.1 General
4.2.2 Test rings <\/td>\n<\/tr>\n
37<\/td>\nFigure 11 \u2013 Illustration of bar grooves dimensions and preparation <\/td>\n<\/tr>\n
39<\/td>\n4.2.3 Brushes arrangement
Figure 12 \u2013 Brush covering <\/td>\n<\/tr>\n
40<\/td>\n4.2.4 Special brush for voltage drop measurement
Figure 13 \u2013 Brushes configuration <\/td>\n<\/tr>\n
41<\/td>\n4.3 Test rig specification for slip rings
4.3.1 General
4.3.2 Ring
Figure 14 \u2013 Control brush arrangement <\/td>\n<\/tr>\n
42<\/td>\nFigure 15 \u2013 Characteristics of grooves <\/td>\n<\/tr>\n
43<\/td>\n4.3.3 Brushes
4.3.4 Configuration for DC and AC operation <\/td>\n<\/tr>\n
44<\/td>\nFigure 16 \u2013 Test rig arrangement for DC operation with 2 brushes per polarity <\/td>\n<\/tr>\n
45<\/td>\n5 Test schedule and operating conditions
5.1 General
Figure 17 \u2013 Test rig arrangement for AC operation with 2 brushes <\/td>\n<\/tr>\n
46<\/td>\n5.2 Environmental conditions
5.2.1 Laboratory environment
5.2.2 Ambient air temperature and ring surface temperature
5.2.3 Ambient humidity
5.3 Operating conditions <\/td>\n<\/tr>\n
47<\/td>\n5.4 Test preparation and inspection
5.4.1 General
5.4.2 Test rig
5.4.3 Brush-holders
5.4.4 Test brushes
5.4.5 Ring roughness
Table 2 \u2013 Test conditions <\/td>\n<\/tr>\n
48<\/td>\n5.4.6 Brush bedding
5.4.7 Brushes measurement
5.5 Test sequence
5.5.1 Test starting
5.5.2 Test duration
5.6 Measurements and observations
5.6.1 General <\/td>\n<\/tr>\n
49<\/td>\n5.6.2 Interval between measurements
5.6.3 Before starting a test sequence <\/td>\n<\/tr>\n
50<\/td>\n5.6.4 Measurements during a test sequence
5.6.5 Measurements after a test sequence
6 Determination of friction coefficient
6.1 General <\/td>\n<\/tr>\n
51<\/td>\n6.2 Test conditions
6.3 Measurements
6.3.1 General
6.3.2 Test rig arrangement of Method a)
6.3.3 Test rig arrangement of Method b)
6.4 Calculation of friction coefficient
6.4.1 Test rig arrangement of Method a) <\/td>\n<\/tr>\n
52<\/td>\n6.4.2 Test rig arrangement of Method b)
6.5 Report <\/td>\n<\/tr>\n
53<\/td>\n7 Determination of voltage drop
7.1 General
Figure 18 \u2013 Example of friction coefficient \u00b5 graph as a function of peripheral speed \u03bdp <\/td>\n<\/tr>\n
54<\/td>\n7.2 Test conditions
7.3 Measurements
7.3.1 General
7.3.2 Brush total voltage drop UB
7.3.3 Brush contact voltage drop Uc <\/td>\n<\/tr>\n
55<\/td>\n7.4 Calculation
7.4.1 Brush total voltage drop UB
7.4.2 Brush contact voltage drop Uc <\/td>\n<\/tr>\n
56<\/td>\n7.5 Report <\/td>\n<\/tr>\n
57<\/td>\n8 Determination of brush wear
8.1 General
8.2 Test conditions
8.3 Measurements
Figure 19 \u2013 Example of brush total voltage drop UB graphas a function of current density JB <\/td>\n<\/tr>\n
58<\/td>\n8.4 Calculation of brush wear
Figure 20 \u2013 Example of brush wear rate WRi of brushesduring the test for a test rig with 4 brushes <\/td>\n<\/tr>\n
59<\/td>\n8.5 Report
9 Determination of commutation ability of brush grades by a specific blackband test on a DC machine
9.1 General <\/td>\n<\/tr>\n
60<\/td>\n9.2 Set-up <\/td>\n<\/tr>\n
61<\/td>\nFigure 21 \u2013 Black-band test circuit configuration using DC generator and resistance load <\/td>\n<\/tr>\n
62<\/td>\nFigure 22 \u2013 Black-band test circuit configuration for Brondell\u2019s loading-back method <\/td>\n<\/tr>\n
63<\/td>\n9.3 Test procedure
9.3.1 Preparation of the test
9.3.2 Operating conditions and test sequence <\/td>\n<\/tr>\n
64<\/td>\n9.4 Black-band graph <\/td>\n<\/tr>\n
65<\/td>\n9.5 Interpretation
9.5.1 General
Figure 23 \u2013 Determination of black-band zone for a specified constant speed of rotation <\/td>\n<\/tr>\n
66<\/td>\n9.5.2 Influence of commutator skin thickness on the black-band zone <\/td>\n<\/tr>\n
67<\/td>\n9.5.3 Influence of brush contact resistance
Figure 24 \u2013 Influence of commutator film thickness on the black-band zone <\/td>\n<\/tr>\n
68<\/td>\nFigure 25 \u2013 Comparison of black-bands for a high contact resistance brushand a low contact resistance brush in case of a motor <\/td>\n<\/tr>\n
69<\/td>\n9.5.4 Estimation of mechanical contact stability deviation by comparing the black-band figures before and after longtime critical operation
Figure 26 \u2013 Comparison of black-bands for a high contact resistance brushand a low contact resistance brush in case of a generator <\/td>\n<\/tr>\n
70<\/td>\nFigure 27 \u2013 Black-band figure deviation of before and after the critical operationof repetitive peak load application of 225 %, for a “strong” grade <\/td>\n<\/tr>\n
71<\/td>\nFigure 28 \u2013 Black-band figure deviation of before and after the critical operation of repetitive peak load application of 225 %, for a “weak” grade <\/td>\n<\/tr>\n
72<\/td>\nAnnex A (informative)Additional information for friction coefficient measurement
A.1 Details of calculation of friction coefficient by using method a) of 4.1.6.1.2 <\/td>\n<\/tr>\n
73<\/td>\nA.2 Adjustment of strain sensor for calculation of friction coefficient by using method b) of 4.1.6.1.3
A.2.1 General
A.2.2 Correlation between output voltage and load
A.2.3 Correlation between friction coefficient and load
Figure A.1 \u2013 Correlation of load cell output voltage Ulc with mass m <\/td>\n<\/tr>\n
74<\/td>\nFigure A.2 \u2013 Example of correlation between load and friction coefficient \u00b5 <\/td>\n<\/tr>\n
76<\/td>\nAnnex B (informative)Black-band zone deviation cases
B.1 Black-band zone in case of limited contact area
Figure B.1 \u2013 Limited contact area and reduction of tangential dimension at contact <\/td>\n<\/tr>\n
77<\/td>\nB.2 Influence of brush mechanical contact instability of brush chattering on the black-band zone
Figure B.2 \u2013 Black-band zone in case of a limited contact area <\/td>\n<\/tr>\n
78<\/td>\nB.3 Black-band zone hysteresis between increased Ia and decreased Ia
Figure B.3 \u2013 Influence of brush mechanical contact instabilityof brush chattering on the black-band zone <\/td>\n<\/tr>\n
79<\/td>\nFigure B.4 \u2013 Black-band zone hysteresis between increasing Iarm and decreasing Iarm <\/td>\n<\/tr>\n
80<\/td>\nAnnex C (informative)Test report example <\/td>\n<\/tr>\n
82<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Rotating electrical machines. Test methods and apparatus for the measurement of the operational characteristics of brushes<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2021<\/td>\n84<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":374786,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[529,2641],"product_tag":[],"class_list":{"0":"post-374777","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-29-160-10","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/374777","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/374786"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=374777"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=374777"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=374777"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}