Abstract: An electric motor includes a magnet rotor which is placed with an air gap interposed between it and a stator and has a magnetic pole portion formed from a plastic magnet which swells by hydrogen bonds, an inverter circuit, a DC-voltage conversion portion, a driving logic control portion, a supply current value control portion, a current value designation portion, a reference current value designation portion, and a correlation designation portion, wherein the correlation designation portion determines an average current value by changing the average current value linearly or non-linearly with respect to a reference current value, and the magnetic pole portion absorbs moisture to swell, thereby making the air gap smaller, at higher humidity than a reference humidity.

Abstract: An electric motor with a permanent magnet excitation comprises permanent magnets retained in a pole housing and associated with the flux-conducting element, wherein at least one permanent magnet and a flux-conducting element are arranged so that they are in positively interlocking engagement.

Abstract: An electric motor (1) has a stator (3), a rotor (2) and a number of permanent magnets (6). The use of permanent magnets (6) having a cuboidal shape, without impairing performance. The stator (3) has a number of permanent magnets (6) having a cuboidal shape, which are embedded in recesses (7) and whose axial length (8) is greater than the axial length (4) of the stator (3).

Abstract: An electric machinery provided with a PM magnetic pole sandwiched by a permeable polar face and a magnetic circuit from an individual magnetic pole provides an innovative design of having disposed the PM magnetic pole sandwiched between the permeable polar face and the magnetic circuit from the individual magnetic pole to prevent PM magnetic pole from falling off and avoid PM magnetic pole magnetic force from being weakened by inverse excitation during the operation.

Abstract: An electromagnetically actuated adjusting apparatus for lens is disclosed. The adjusting apparatus comprises a body capable of furnishing a lens inside, at least one permanent magnet, a first magnetic conductor and a second magnetic conductor. The first and the second magnetic conductors are respectively wound with a plurality of coils. The permanent magnet is adjoined to the body and has a first polarity and a second polarity opposing each other. The first magnetic conductor has at least a first extension member provided opposite to the first polarity. The second magnetic conductor has at least a second extension member provided opposite to the second polarity. The first extension member and the second extension member can better converge magnetic flux lines emanating from the coils when charged to the positions nearing the two polarities of the permanent magnet so high-efficiency focusing and zooming of lens can be achieved.