Abstract
Electric machines cover an extremely wide range of power ratings, from 1 mW (\(10^{-3}\) W) or less, to 1 GW (\(10^{9}\) W), which is a ratio of \(1:10^{12}\). The power range of 1 kW may be considered as the boundary between small and large machines.
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Notes
- 1.
This is the result of scaling laws.
- 2.
The two-phase symmetrical components transformation is similar to the three-phase one, but instead of \(a=\exp (j2\pi /3)\) we now have \(a=\exp (j\pi /2)=j\)).
- 3.
It is trapezoidal if there is a distributed winding with \(q>1\); for a concentrated winding, the emf also has a block shape.
- 4.
Prove this.
- 5.
In the URS, the PM excitation is supposed to be along the negative d-axis, which corresponds to a rotor emf along the positive q-axis.
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Melkebeek, J.A. (2018). Small Electric Machines and Their Power Electronic Control. In: Electrical Machines and Drives. Power Systems. Springer, Cham. https://doi.org/10.1007/978-3-319-72730-1_18
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DOI: https://doi.org/10.1007/978-3-319-72730-1_18
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