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An electric motor comprising a shaft 300 on which is mounted n motor modules (where n is an integer). Each motor module consists of two generally disc-shaped rotors 302 having a coil 304 sandwiched between them. Each rotor/coil module is separated from the adjacent module by an insulative spacer ele

An electric motor comprising a shaft 300 on which is mounted n motor modules (where n is an integer). Each motor module consists of two generally disc-shaped rotors 302 having a coil 304 sandwiched between them. Each rotor/coil module is separated from the adjacent module by an insulative spacer element 306 and a PTFE disc 308 which is mounted on the shaft 300 concentrically with the rotors 302 and the coil 304. The axis about which each coil 304 is wound is substantially in line with the axis of rotation of the respective rotors 302.

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1. A machine arrangement comprising a shaft on which is mounted n modules, where n is an integer, each module comprising at least one rotor, at least one stator and at least one respective coil, the at least one stator at least partially surrounding the periphery of the at least one rotor and the at

1. A machine arrangement comprising a shaft on which is mounted n modules, where n is an integer, each module comprising at least one rotor, at least one stator and at least one respective coil, the at least one stator at least partially surrounding the periphery of the at least one rotor and the at least one coil, the at least one coil being wound as a stack of adjacent layers, each layer of the stack lying normal to the axis of rotation of the shaft at a point which is axially disposed on the shaft with respect to the adjacent layers of the stack, the layers comprising alternative windings which respectively extend radially inwardly and outwardly of the shaft.2. An arrangement according to claim 1, wherein each module comprises two rotors with an energizing coil sandwiched therebetween.3. An arrangement according to claim 1, comprising at least five modules mounted on the same shaft.4. An arrangement according to claim 3, comprising at least eleven modules mounted on the same shaft.5. An arrangement according to claim 1, wherein the or each rotor is provided with peripheral teeth.6. An arrangement according to claim 5, wherein said teeth are substantially equally-spaced.7. An arrangement according to claim 1, comprising two or more modules, wherein the rotors of at least some of the modules, are angularly displaced relative to each other.8. An arrangement according to claim 7, wherein the rotors of all of the modules are angularly displaced relative to each other.9. An arrangement according to claim 1, wherein the stator comprises inwardly projecting teeth.10. An arrangement according to claim 9, wherein said inwardly projecting teeth substantially correspond to the teeth of respective rotor or rotors in both width and spacing.11. An arrangement according to claim 1, comprising two or more modules, and further comprising a control circuit arranged to supply an energizing current to each of the coils in a predetermined sequence.12. An arrangement according to claim 11, wherein the control circuit includes means for feeding a flyback current produced in the coil windings back to a power supply.13. An arrangement according to claim 1, wherein the or each rotor is fixed to the shaft such that rotary movement of the or each rotor produces corresponding rotation of the shaft.14. An arrangement according to claim 1, wherein the or each module comprises an individual stator.15. An arrangement according to claim 1, comprising two or more modules, the at least one stator of each module joined to its respective stator to form a single body surrounding some or all of said modules.16. An arrangement according to claim 1 in the form of an AC or DC motor.17. An arrangement according claim 1 in the form of a DC generator or AC alternator.18. An arrangement according to claim 1, wherein the at least one rotor comprises a plurality of cut away portions.