| 摘要 |
A large air gap electric motor has a permanent magnet rotor with a large air gap to a slotless, less, cylindrical core surrounding the rotor. A winding of at least one phase is disposed in the large air gap. This winding is disposed on a coil form wihch is metallized on one face to reflect heat of the winding away from the rotor. The winding is formed from a plurality of pancake coils with a plurality of pancake coils around the periphery in each layer and a plurality of layers in a radial dimension. Each pancake coil in successive layers becomes progressively larger to substantially fill the radial air gap. The surrounding slotless core is made from a spirally wound flux conductor, which may be a flat ribbon of rectangular cross section.
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