Dc electrical machines

摘要

A dc electrical machine with a large number of phases. The machine includes a rotor and a stator assembly. The rotor has Np rotating field poles. The stator has Ns winding slots, where Ns/Np is a non-integer ratio. A stator winding includes a plurality of coils received in the winding slots and defines a plurality of stator phases. A power electronic switching assembly includes first and second dc load terminals that can be connected to external equipment and a plurality of switching modules. Each switching module includes power electronic devices and is connected to a respective stator coil. A first proportion of the switching modules are connected together in series between the first and second dc load terminals and a second proportion of the switching modules are connected together in series between the first and second dc load terminals to define two parallel dc circuits.

主权项

1. A dc electrical machine comprising:
a rotor comprising Np rotating field poles; an armature comprising Ns winding slots, where Ns/Np is a non-integer ratio; an armature winding comprising a plurality of coils received in the winding slots, the armature winding defining a plurality of armature phases; and a power electronic switching assembly comprising:
a first dc load terminal;a second dc load terminal; anda plurality of switching modules, wherein each switching module comprises two ac terminals, two dc terminals, and power electronic devices; wherein each coil is connected to the ac terminals of a respective switching module, and wherein a first proportion of the plurality of switching modules have their dc terminals connected together in series between the first dc load terminal and the second dc load terminal, and a second proportion of the plurality of switching modules have their dc terminals connected together in series between the first dc load terminal and the second dc load terminal to define two parallel dc circuits.