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    • 3. 发明专利
    • SYNCHRONOUS MACHINE
    • JPH11285214A
    • 1999-10-15
    • JP3603999
    • 1999-02-15
    • BOSCH GMBH ROBERT
    • RAGALY ISTVAN
    • H02K19/10H02K1/22H02K1/27H02K21/04
    • PROBLEM TO BE SOLVED: To improve the permanent magnet holder of a synchronous machine, simplify its construction, realize easy and low cost manufacturing method, and furthermore, securely position a rotor in a radial direction and in an axial direction by a simple method, when the rotor is assembled. SOLUTION: A holder 7 is constituted of two holding rings 1a and 2a which surround a field system 9 at their centers. Both the holding rings 1a and 2a are pressed against each other, and furthermore, the outlines of the holding rings 1a and 2a are extended to the lower sides of nail poles 10. The holding arms 4 of the holding rings 1a and 2a whose number corresponds to the number of poles are bent and formed, so as to be extended into gaps and reach pole plates 11 to support permanent magnets 8. Free ends of the respective holding arms 4 have holding tabs 5 bent toward a rotor shaft. Furthermore, the holding tabs 5 are positioned in grooves 6 which are formed in the respective facing inner surfaces of both the pole plates 11 at positions facing each other.
    • 9. 发明专利
    • FR2595883A1
    • 1987-09-18
    • FR8618280
    • 1986-12-29
    • BOSCH GMBH ROBERT
    • FRISTER MANFREDRAGALY ISTVAN
    • H02K3/493H02K1/16H02K5/24
    • Operating noise of a dynamo electric machine, and particularly a three-phase vehicular-type alternator, can be reduced by changing the reluctance or permeability of the magnetic path between rotor and stator of adjacent stator teeth by splitting the stator teeth to introduce additional radially extending gaps in the stator teeth or by distributing, non-uniformly or uniformly, ferromagnetic slot closers about the circumference of the stator slots while leaving, adjacent a stator slot with a magnetic closer, open stator slots or slots covered only with non-magnetic slot cover elements, such as treated paper, cardboard, or the like. This changes the frequency of attraction between rotor and stator to a frequency range which is not humanly perceptible or annoying, for example falling below the frequency range at which the alternator can operate, for example below idling speed of an internal combustion engine driving the alternator, or towards a frequency range so high that the operating noise level of the internal combustion engine masks any generator noise.