Because the rotor is much lighter in weight (mass) than a conventional rotor formed from copper windings on steel laminations, the rotor can accelerate much more rapidly, often achieving a mechanical time constant under one ms. This is especially true if the windings use aluminum rather than the heavier copper. But because there is no metal mass in the rotor to act as a heat sink, even small coreless motors must often be cooled by forced air. Overheating might be an issue for coreless DC motor designs. COUNT 5
QSN1 What is a likely problem of coreless DC motors? ANS1 Overheating QSN2 How does a coreless rotor compare to traditional rotors in terms of weight? ANS2 lighter QSN3 What advantage does a coreless rotor have over traditional variants? ANS3 accelerate much more rapidly QSN4 The lack of a metal mass in the core causes what function to be absent? ANS4 heat sink QSN5 How is a coreless motor cooled? ANS5 forced air