Winding
Purpose
Ideal winding defining an electro-magnetic interface
Library
Magnetic / Sources
Description
The Winding forms the interface between the electrical and the magnetic domain. A winding of \(N\) turns is described with the equations:
where \(v\) and \(i\) are voltage and current at the electrical terminals. \(\mathcal{F}\) is the magneto-motive force (MMF) and \(\dot{\Phi}\) is the rate-of-change of the magnetic flux through the winding. The left-hand side of the equations above refers to the electrical domain, the right-hand side to the magnetic domain.
The sign conventions used for the electrical and magnetic quantities are illustrated in Fig. 280 for the two polarities of the winding. Notice the positions of the black dot and the brown arrow in the winding symbol.
Fig. 280 Sign conventions used for electrical and magnetic quantities
Parameters
- Number of turns
Specifies the number of winding turns.
- Polarity
Specifies the polarity of the winding. Choosing a negative polarity is equivalent to specifying a negative number of turns.
Probe Signals
- Winding voltage
The voltage measured from the positive (marked) to the negative electrical terminal of the winding, in volts (\(\mathrm{V}\)).
- Winding current
The current flowing through the winding, in amperes (\(\mathrm{A}\)). A current entering the winding at the marked terminal is counted as positive.
- MMF
The magneto-motive force measured from the marked to the unmarked magnetic terminal, in ampere-turns (\(\mathrm{A}\)).