Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
119 words
A direct current motor provided with an armature and a plurality of field magnet devices disposed around said armature and spaced apart from said armature, wherein each of said field magnet devices comprises: a main pole having a predetermined polarity; and a pair of auxiliary poles made of permanent magnets, one of said auxiliary poles being disposed at a position adjacent to one end of said main pole and the other of said auxiliary poles being disposed at a position adjacent to the other end of said main pole, the polarity of each auxiliary pole being the same as that of said main pole and the permeability of each auxiliary pole being smaller than that of said main pole.
Claim 2
Dependent Claim
119 words
A direct current motor provided with an armature and a plurality of field magnet devices disposed around said armature and spaced apart from said armature, wherein each of said field magnet devices comprises: a main pole having a predetermined polarity; and a pair of auxiliary poles made of permanent magnets, one of said auxiliary poles being disposed at a position adjacent to one end of said main pole and the other of said auxiliary poles being disposed at a position adjacent to the other end of said main pole, the polarity of each auxiliary pole being the same as that of said main pole and the permeability of each auxiliary pole being smaller than that of said main pole.
Claim 3
Dependent Claim
16 words
A direct current motor according to claim 1, wherein said main pole consists of an electromagnet.
Claim 4
Dependent Claim
17 words
A direct current motor according to claim 1, wherein said main pole consists of a permanent magnet.
Claim 5
Dependent Claim
89 words
A direct current motor, comprising: a shaft; an armature mounted on said shaft; and a plurality of field magnet devices disposed around said armature and spaced apart from said armature, each of said field magnet devices comprising a main pole and means for reducing the magnetic flux existing at central positions between adjacent field magnet devices, said means including two permanent magnet auxiliary poles corresponding to said main pole and having smaller permeability than said corresponding main pole, said main pole being mounted between said two corresponding auxiliary poles.
Claim 6
Dependent Claim
89 words
A direct current motor, comprising: a shaft; an armature mounted on said shaft; and a plurality of field magnet devices disposed around said armature and spaced apart from said armature, each of said field magnet devices comprising a main pole and means for reducing the magnetic flux existing at central positions between adjacent field magnet devices, said means including two permanent magnet auxiliary poles corresponding to said main pole and having smaller permeability than said corresponding main pole, said main pole being mounted between said two corresponding auxiliary poles.
Claim 7
Dependent Claim
23 words
A direct current motor as in claim 4, wherein each of said auxiliary poles has the same polarity as said corresponding main pole.
Claim 8
Dependent Claim
19 words
A direct current motor as in claim 5, wherein each of said auxiliary poles is made from ceramic material.
Claim 9
Dependent Claim
15 words
A direct current motor as in claim 6, wherein said shaft is a heat pipe.
Claim 10
Dependent Claim
17 words
A direct current motor as in claim 7, further comprising radiating fins affixed to said heat pipe.
Claim 11
Dependent Claim
17 words
A direct current motor as in claim 8, further comprising a fan directed to said radiating fins.
Claim 12
Dependent Claim
18 words
A direct current motor as in claim 7, wherein each of said main poles is a permanent magnet.
Claim 13
Dependent Claim
17 words
A direct current motor as in claim 7, wherein each of said main poles is an electromagnet.