Generator with axially movable rotor - has nut attached to rotor core running in thread cut in shaft to move rotor in response to power demand

摘要

A small generator has a permanent magnet rotor and is designed to give a measure of power control. The rotor (9) can slide along the shaft (1) to which it is attached by a nut running in a thread in the shaft. Axial restraint is provided by a spring (4). The load on the generator determines the rotor travel along the shaft, and thus its overlap with the generator stator core and the degree of generator excitation. The spring pushes the rotor out again if the load reduces.