  A (smooth) dynamical system with transformation group $\mathbb{T}^n$ is a
triple $(A,\mathbb{T}^n,\alpha)$, consisting of a unital locally convex algebra
$A$, the $n$-torus $\mathbb{T}^n$ and a group homomorphism
$\alpha:\mathbb{T}^n\rightarrow\Aut(A)$, which induces a (smooth) continuous
action of $\mathbb{T}^n$ on $A$. In this paper we present a new, geometrically
oriented approach to the noncommutative geometry of principal torus bundles
based on such dynamical systems. Our approach is inspired by the classical
setting: In fact, after recalling the definition of a trivial noncommutative
principal torus bundle, we introduce a convenient (smooth) localization method
for noncommutative algebras and say that a dynamical system
$(A,\mathbb{T}^n,\alpha)$ is called a noncommutative principal
$\mathbb{T}^n$-bundle, if localization leads to a trivial noncommutative
principal $\mathbb{T}^n$-bundle. We prove that this approach extends the
classical theory of principal torus bundles and present a bunch of
(non-trivial) noncommutative examples.
