Railway Applications - Rolling Stock - Combined Testing - Part 2: Chopper-Fed Direct Current Traction Motors and Their Control
|Publication Date:||1 June 2002|
|ICS Code (Railway rolling stock):||45.060|
This part of IEC 61377 applies to the combinations of motor(s), chopper and their control, and its object is to specify
− the performance characteristics of electric drives consisting of a chopper, direct current motors, and the related control system;
− methods of verifying these performance characteristics by tests.
IEC 60349-1 applies to chopper-fed direct current motors, IEC 61287-1 to power electronic convertors, and IEC 60571 to electronic equipments.
This standard applies to the combination of motor(s), chopper, and their control. As a consequence, IEC 60349-1 describes the tests to demonstrate the compliance of the motor to its specification, while IEC 61287-1 does the same for the chopper. It is self-evident that some of the tests mentioned in this standard may generally replace the corresponding ones described in the above-mentioned standards. An agreement should be reached between the parties to avoid the duplication of tests.
A complete combined test is heavy and often requires high power, which is not always available in a workshop. An agreement between the user and the manufacturer may be reached to allow testing either in the workshop or on the vehicle.
At the time of drafting this standard, only the following combinations of motors and choppers are used for traction applications, but it may also apply to other combinations, which may be used in the future:
− direct current series motors (one or more connected in series and/or in parallel) fed by a chopper converter (figure 1a)
− direct current separately excited motors (one or more connected in series) fed by a chopper converter (figure 1b).
For both cases, electrical braking circuits, if used, are included.
The separate exciting circuits and their control, or the shunting circuit and their control, for series motors, are considered as a part of the combined system.
More details on possible system combinations can be found in IEC 61287-2.
The d.c. source can be a supply line, a rectifier, a chopper, an input convertor, and a diesel generator with integrated rectifiers, etc.
Environmental conditions relative to motor, chopper, and control system are detailed in IEC 60349-1, IEC 61287-1 and IEC 60571.