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An electric generator for use in a turbocharger includes a rotor mounted on the rotational shaft of the turbocharger and comprising a single permanent magnet fitted in an outer cylindrical sleeve which prevents the rotor from breakage upon high-speed rotaiton thereof. The rotor also includes heat in

An electric generator for use in a turbocharger includes a rotor mounted on the rotational shaft of the turbocharger and comprising a single permanent magnet fitted in an outer cylindrical sleeve which prevents the rotor from breakage upon high-speed rotaiton thereof. The rotor also includes heat insulation between the permanent magnet and the rotational shaft. The heat insulation portion may be an air gap or a heat insulating member.

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A rotor for an electric generator for use on a rotational shaft of a turbocharger which can be driven by the exhaust energy discharged by an internal combustion engine, comprising: a single permanent magnet positioned about the rotational shaft; an outer cylindrical sleeve positioned about said perm

A rotor for an electric generator for use on a rotational shaft of a turbocharger which can be driven by the exhaust energy discharged by an internal combustion engine, comprising: a single permanent magnet positioned about the rotational shaft; an outer cylindrical sleeve positioned about said permanent magnet so that said permanent magnet is force-fitted in said outer cylindrical sleeve, said permanent magnet comprising a material having a high tensile strength; side plates respectively positioned on opposing sides of said permanent magnet and attached to said outer cylindrical sleeve so as to fix said outer cylindrical sleeve to the rotational shaft; and a heat insulating portion disposed between the rotational shaft and said permanent magnet.