Patent ID: 6034464
Filing Date: 2000-03-07
Classification: H02K

Abstract:
A vehicle alternator comprising a rotor which includes:a rotor coil, which generates magnetic flux when an electric current is passed through it;a first pole core assembly and a second pole core assembly, each having claw-shaped magnetic poles, which are disposed so as to cover said rotor coil, are mutually interlocked, and are polarized by said magnetic flux;magnets, which are disposed between adjacent pairs of said claw-shaped magnetic poles and are polarized so as to minimize magnetic flux leakage between said claw-shaped magnetic poles;said claw shaped magnetic poles constructed such that it satisfies the relationship0.3.ltoreq.{Br.multidot.(t1+t2).multidot.L}/(W.multidot.t1.multidot.cos.the ta.).ltoreq.2.0where Br represents the residual magnetic flux density of each of said magnets, L represents the length from the short side at the tip to the long side at the base of each of said claw-shaped magnetic poles, W represents the width in the circumferential direction at said base, 2.theta. represents the angle formed by an oblique side which joins one end of said tip to one end of said base and another oblique side which joins the other end of said tip to the other end of said base, t1 represents the thickness of each of said claw-shaped magnetic poles at the base, and t2 represents the thickness of each of said claw-shaped magnetic poles at the tip.