Alternator

A alternator comprising:

• a stator having a stator coil;
• a rotor having permanent magnets and magnetic poles which are disposed on an outer periphery of said rotor and along a circumferential direction of said rotor, said magnetic poles being polarized to alternately different polarities wherein said magnetic poles have flanges which project at least circumferentially from side edges thereof and abut an outer surface of said permanent magnets, and a magnetic force intensity of each of a plurality of side faces of said permanent magnets is substantially equal to a magnetic force intensity developed in each of said magnetic poles which is respectively adjacent thereto;
• a rectifier constructed using a MOS type transistor that converts an alternating current generated by said stator coil to a direct current, wherein said MOS type transistor is formed using as a base material a monocrystalline SiC that is a compound of silicon (Si) and carbon (C) and is smaller in resistivity than Si;
• and
• a frame body, wherein said stator, said rotor an said rectifier are integrated in said frame body.

An alternator comprising:

• a stator having a stator coil;
• a rotor comprising:
• a rotor coil;
• Lundell type magnetic poles which are disposed on an outer periphery of said rotor and along a circumferential direction of said rotor, said magnetic poles being polarized by said rotor coil to alternately different polarities;
• permanent magnets disposed between said Lundell type magnetic poles, respectively, so that side faces of each of said permanent magnets in said circumferential direction are polarized to opposite polarities, and said Lundell type magnetic poles and said side faces of said permanent magnets which are adjacent to each other have the same polarity to thereby exhibit smooth variations of magnetic flux directed toward said stator coil along said circumferential direction;
• wherein said Lundell type magnetic poles have flanges which project at least circumferentially from side edges thereof and abut on an outer peripheral surface of said permanent magnets;
• and
• a rectifier constructed using a MOS type transistor that converts an alternating current generated by said stator coil to a direct current, wherein said MOS type transistor is formed using as a base material a monocrystalline SiC that is a compound of silicon (Si) and carbon (C) and is smaller in resistivity than Si;
• wherein said permanent magnets are integrated within a resin made retainer body having a heat insulation property, said retainer body is disposed between said respective Lundell type magnetic poles, and at least one of said permanent magnets is an anisotropic ferrite magnet or a resin magnet containing rare earth magnet powder.

An alternator comprising:

• a stator having a stator coil;
• a rotor comprising:
• a rotor coil;
• Lundell type magnetic poles which are disposed on an outer periphery of said rotor and along a circumferential direction of said rotor, said magnetic poles being polarized by said rotor coil to alternately different polarities;
• permanent magnets disposed between said Lundell type magnetic poles, respectively, so that side faces of each of said permanent magnets in said circumferential direction are polarized to opposite polarities, and said Lundell type magnetic poles and said side faces of said permanent magnets which are adjacent to each other have the same polarity to thereby exhibit smooth variations of magnetic flux directed toward said stator coil along said circumferential direction;
• wherein said Lundell type magnetic poles have flanges which project at least circumferentially from side edges thereof and abut on an outer peripheral surface of said permanent magnets;
• and
• a rectifier constructed using a MOS type transistor that converts an alternating current generated by said stator coil to a direct current, wherein said MOS type transistor is formed using as a base material a monocrystalline SiC that is a compound of silicon (Si) and carbon (C) and is smaller in resistivity than Si;
• wherein said permanent magnets are integrated within a resin made retainer body having a heat insulation property;
• said retainer body is disposed between said respective Lundell type magnetic poles, and is shaped like a ring that is periodically folded back in such a manner as to extend between said Lundell type magnetic poles that alternately project from a front and a rear side face of said rotor along said circumferential direction;
• and
• said permanent magnets are accommodated in respective folded back leg portions of said retainer body and at least one of said permanent magnets is an anisotropic ferrite magnet or a resin magnet containing rare earth magnet powder.