Book at a Glance

PART I - Electric Motors, Drives and Energy Saving

Chapter 11. Philosophy of quality systems and testing of electrical machines

Philosophy of quality systems
Transition to ISO 9001(2000)
Testing of electrical machines
Procedure for testing
Load test
No-load test
Tolerances in test results
Certification of motors used in hazardous locations

Type tests
Type tests are conducted on the first machine of each type or design to determine the characteristics and demonstrate its compliance with the relevant Standards. These tests provide a standard reference for any subsequent similar machine. The following type tests can be conducted,

Seismic disturbances
We provide a brief account of such disturbances in Section 14.6. This also deals with the recommended tests and their procedures to verify the suitability of critical structures, equipment and devices for locations that are prone to such disturbances. Large machines are usually verified by analysis.

EMC (immunity) and EMI (emission) tests [for details see Section 23.18 and 14.3.13]
Similar guidelines will apply as for switchgear and controlgear assemblies (Section 14.3.13). Accordingly, no test is applicable for machines not incorporating any electrical or electronic circuit that is susceptible to EM interferences. Large motors or critical motors, however, fitted with devices like PTC thermistors, temperature sensors, vibration probes, pulse transmitters, tacho-generator (TG) or other electronic circuits and synchronous motors, generators and d.c. motors incorporating electronic field excitation system (Section 16.3.4) may be influenced by EM interferences and all such circuits must be tested for EM compatibility (immunity). For details see IEC 60034-1 and the Standards mentioned in Section 14.3.13.

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