1. Adjusting device for electrically adjusting the relative position of the angle of rotation of a camshaft (15, 15′) in relation to a crankshaft of an internal-combustion engine, comprising an adjusting gear mechanism, which is formed as
a triple-shaft gear mechanism and which has a crankshaft-fixed driving part, a camshaft-fixed driven part, and an adjusting
shaft (13, 13′, 13″) connected in a torsion-proof manner to an adjusting motor shaft (32, 32′, 32″) of an electric adjusting motor (3 to 3′″″), wherein the adjusting motor (3 to 3′″″) is formed as a brushless DC motor with a housing-fixed stator (35) and a permanent magnet rotor (34 to 34″″), the adjusting gear mechanism includes one of a double eccentric gear mechanism (2, 2′, 2″) and a double planetary gear mechanism (74), which exhibit a speed reduction of up to about 1:250 and low friction, and the adjusting motors (3 to 3′″″) includes highly inductive permanent magnet rotors (34 to 34″″).
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