Inductor

Symbol

Information

An inductor is a passive electrical component that stores energy in a magnetic field when electrical current flows through it. The fundamental equation governing inductors is:

\[V = L \cdot \frac{dI}{dt}\]

Where:

\(V\) is the voltage across the inductor (Volts)
\(I\) is the current flowing through the inductor (Amperes)
\(L\) is the inductance (Henries, H)
\(\frac{dI}{dt}\) is the rate of change of current

Inductors are used in filtering, energy storage, and oscillatory circuits.

Ports

p: Positive terminal
n: Negative terminal

Symbol description

Field	Value
Symbol.name	Inductor
Symbol.file	Inductor.sym
Symbol.directory	Basic
Symbol.referance	`L`
Model.name	`Inductor`
Model.file	Inductor.py

Model

The Inductor model implements an ideal inductor.

An inductor stores electrical energy in a magnetic field and its voltage is proportional to the rate of change of current through it.

Attributes:

V (signal): Output voltage signal across the inductor, defined between nodes (p, n).

I (signal): Input current signal through the inductor, defined between nodes (p, n).

L (param): Inductance value in Henries (H), default is 1.0 mH.

Methods:

analog(): Defines the inductor behavior using the equation:

\[V = L \cdot \frac{dI}{dt}\]

from pyams.lib import model, signal, param, voltage, current

class Inductor(model):
    """
    Inductor model based on the equation: V = L * dI/dt
    """

    def __init__(self, p, n):
        # Signal declaration
        self.V = signal('out', voltage, p, n)
        self.I = signal('in', current, p, n)

        # Parameter declaration
        self.L = param(1e-3, 'H', 'Inductance value')

    def analog(self):
        """Defines the inductor’s current-voltage relationship"""
        self.V += self.L * self.I.dt()

Command syntax

The syntax for defining an inductor in a PyAMS simulation:

# Import the model
from pyams.models import Inductor

# Lname: is the name of the inductor instance
# p, n: The connection points in the circuit
Lname = Inductor(p, n)