Shown in Fig. 6.3 is a surface-mounted magnet machine with an airgap,
or surface armature winding. Such machines take advantage of the fact that modern, permanent magnet materials have very low permeabilities and that, therefore, the magnetic field produced is relatively insensitive to the size of the air-gap of the machine. It is possible to eliminate the stator teeth and use all of the periphery of the air-gap for windings.
Not shown in this figure is the structure of thee armature winding.
This is not an issue in “conventional” stators, since the armature is contained in slots in the iron stator core. The use of an air-gap winding
gives opportunities for economy of construction, new armature winding
forms such as helical windings, elimination of “cogging” torques and
(possibly) higher power densities.
or surface armature winding. Such machines take advantage of the fact that modern, permanent magnet materials have very low permeabilities and that, therefore, the magnetic field produced is relatively insensitive to the size of the air-gap of the machine. It is possible to eliminate the stator teeth and use all of the periphery of the air-gap for windings.
This is not an issue in “conventional” stators, since the armature is contained in slots in the iron stator core. The use of an air-gap winding
gives opportunities for economy of construction, new armature winding
forms such as helical windings, elimination of “cogging” torques and
(possibly) higher power densities.
No comments:
Post a Comment