Patent classifications
H
ELECTRICITY
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H02
GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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H02K
DYNAMO-ELECTRIC MACHINES
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21/00
Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
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H02K21/021
Means for mechanical adjustment of the excitation flux
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H02K21/022
by modifying the relative position between field and armature, e.g. between rotor and stator
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H02K21/025
by varying the thickness of the air gap between field and armature
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H02K21/026
Axial air gap machines
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