Abstract
Although DC commutator machines are nowadays largely being replaced by rotating field machines, they remain an interesting study object. The basic principles for energy conversion are similar to those of other machines. Moreover, their excellent control properties (e.g. speed control, torque control) are the inspiration for modern drive control schemes for rotating field machines. Starting from the basic electromagnetic laws, the electromagnetic energy conversion in DC machines is explained. Attention is paid also to commutation and armature reaction. Motoring and generating characteristics are discussed in detail.
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Notes
- 1.
Zenobe Gramme was a Belgian inventor; there is a statue of him on the bridge over the Meuse in Liège.
- 2.
Can you prove this?
- 3.
The auxiliary poles act only on the commutating conductors in the inter-polar space while the compensation windings act only on the air gap between pole shoes and armature.
- 4.
Which is sometimes also called additive compound or over-compound excitation.
- 5.
The insulation of the windings is usually designed for rated voltage; higher than rated voltages will reduce the machine’s life expectancy.
- 6.
Prove that the characteristics for field weakening are approximately obtained by shifting the characteristic to higher torque values for the same speeds (consider operating points for the same flux, with and without parallel resistances; neglect the resistances in armature and series excitation winding).
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Melkebeek, J.A. (2018). Direct Current Commutator Machines. In: Electrical Machines and Drives. Power Systems. Springer, Cham. https://doi.org/10.1007/978-3-319-72730-1_2
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DOI: https://doi.org/10.1007/978-3-319-72730-1_2
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Publisher Name: Springer, Cham
Print ISBN: 978-3-319-72729-5
Online ISBN: 978-3-319-72730-1
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