BS EN 60773:2021 pdf free

06-28-2021 comment

BS EN IEC 60773:2021 pdf free.Rotating electrical machines – Test methods and apparatus for the measurement of the operational characteristics of brushes.
It is possible that no single test rig can accommodate all the required application parameters; it therefore follows that more than one type of test rig would be required. These test rigs shall be so constructed that, relative to the quantities to be measured (see Clauses 6 to 8). the required brush operating parameters may be easily and accurately obtainable.
It should be appreciated that, because of the many variables involved and the fact that this equipment is “non-commutating, absolute values obtained from such test machines will differ from those obtainable from “real machines. Moreover, for the above reasons and because of differing ambient conditions, identical results may not be obtainable from test rigs of similar design and construction.
4.1 specifies general requirements for test rig. Additional requirements for commutators applications are disclosed in 4.2 and for slip rings in 4.3.
4.1.2 Rings
4.1.2.1 General
For the reasons given above, ills not possible to specify a single “standard test machine, but machines constructed within the framework given below should be capable of producing satisfactory results.
4.1.2.2 Ring material
Test ring material and Its characteristics, in particular hardness, should be in accordance to the application. Composition and hardness according to ISO standard shall be specified in the test report.
4.1.2.3 Rings dimensions and geometry
The diameter of the test ring shall be not less than 200 mm.
The geometrical profile of the ring shall be measured using a suitable depth gauge when the ring mounted on its axis rotating slowly in its own bearings. The run-out shall not produce a depth gauge deflection of greater than 0,010 mm with one wave. Furthermore, at operating speed there shall be no significant vibration due to unbalance. The tests shall be carried out at a speed lower than the critical speed. Run-out shall be recorded in test report.
This order of accuracy shall be achieved if the ring is turned with a suitable tool at a speed as near as possible to the highest test velocity, the ring being mounted in its own bearings. All burrs” and swarfs shall be removed from the slots I grooves and slot I grooves edges before the test. The minimum amount of metal only shall be removed during this turning process in order to prevent the formation of bevels on the edges.
From the measurement of the profile at two different tracks of the ring the cylindricity may be evaluated. A maximum value of 0,010mm is recommended.BS EN IEC 60773 pdf download.

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