of projecting claws application_number US 62011207 A description a claw teeth motor comprising a stator receiving a field coil inside an annular core and a cylindrical shaped rotor provided on an inner periphery of the stator is used and a transmission comprising a gear or the like is arranged inside the rotor with a stator core of the claw teeth motor the annular field coil and the annular stator core are sealed by an organic material such as resin etc thereby the field coil does not come into contact with air with the construction since it suffices that the stator core be formed to have a recess or a hollow in cross section and the field coil be arranged in the recess or the hollow and a major part of a surface area of the field coil is surrounded by the stator core sealing with the organic material is made easy also the construction is made such that a hollow structured rotor is arranged on an inner periphery of the stator core a transmission comprising a planetary gear or the like is arranged in the hollow portion and mechanical portions thereof is filled with lubricating oil lubricant or the like in addition the stator core is preferably formed from a powder core for the purpose of reducing an eddy current loss a rotating electrical machine with a transmission according to an embodiment of.