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A heat generator for reducing emissions includes a permanently magnetized, disc-shaped rotor; a stator axially separated from the rotor and in which the rotor induces electric currents as it rotates to generate heat in the stator; and an adjoining cooling duct through which a cooling liquid flows to

A heat generator for reducing emissions includes a permanently magnetized, disc-shaped rotor; a stator axially separated from the rotor and in which the rotor induces electric currents as it rotates to generate heat in the stator; and an adjoining cooling duct through which a cooling liquid flows to dissipate heat generated in the stator. The rotor and stator are axially movable in relation to one another to adjust the heat generated in the stator. Heat output is controlled by a member acting axially on the rotor in the direction of the stator with a variable force against the action of a repelling force, and includes a soft magnetic material forming part of the stator. The permanently magnetized rotor and the stator are magnetically attracted to one another, and it is possible to strengthen/weaken their to achieve a predetermined output/speed profile.

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1. A heat generator for reducing emissions from motor vehicles, characterised by a permanently magnetised, disc-shaped rotor (9, 12, 13), a stator (20, 22, 23), which is axially separated from the rotor and in which the rotor induces electric currents as it rotates, which generate heat in the stator

1. A heat generator for reducing emissions from motor vehicles, characterised by a permanently magnetised, disc-shaped rotor (9, 12, 13), a stator (20, 22, 23), which is axially separated from the rotor and in which the rotor induces electric currents as it rotates, which generate heat in the stator, a cooling duct (21) adjoining the stator for a flowing cooling liquid in order to dissipate the heat generated in the stator, the rotor (9, 12, 13) and the stator (20, 22, 23) being axially moveable in relation to one another in order to adjust the heat generated in the stator, and means (15, 16, 19, 27, 28, 37, 38, 40) for determining the heat output generated in the stator by acting axially on the rotor in the direction of the stator with a variable force against the action of a repelling force, which is generated by the currents induced in the stator, said means (15, 16, 19, 27, 28, 37, 38, 40) comprising a soft magnetic material (27, 28), which constitutes part of the stator, so that a magnetic attraction force acts between the permanently magnetised rotor (9) and the stator (29), and means (15, 16, 19, 27, 28, 37, 38, 40) for strengthening and/or weakening the magnetic attraction force for achieving a predetermined output/speed profile.