Rotor for heat generators and its manufacturing method

摘要

A method for producing a rotor assembly of a heat generator. The rotor assembly includes an inner rotor and an outer rotor that is rotated integrally with the inner rotor. The producing method includes forming the inner rotor from iron or iron alloy, and casting the outer rotor around the inner rotor by aluminum or aluminum alloy so that the outer rotor is firmly fixed to the inner rotor without slippage when heated.