A DC commutator motor includes a yoke, a field magnet, and an armature. A shaft is positioned on a central axis of the armature. A plurality of commutator segments is positioned in a circumferential direction of the shaft. A plurality of armature slots is formed on an outer periphery of an armature core. An upper coil is wound the number of turns Na through two armature slots, which are located apart from each other with the predetermined number of armature slots therebetween, at their opening sides. A lower coil is connected in parallel with the upper coil and wound the number of turns Nb through the two armature slots at their bottom sides. The number of turns Na is smaller than the number of turns Nb.

A DC commutator motor includes a yoke, a field magnet, and an armature. A shaft is positioned on a central axis of the armature. A plurality of commutator segments is positioned in a circumferential direction of the shaft. A plurality of armature slots is formed on an outer periphery of an armature core. An upper coil is wound the number of turns Na through two armature slots, which are located apart from each other with the predetermined number of armature slots therebetween, at their opening sides. A lower coil is connected in parallel with the upper coil and wound the number of turns Nb through the two armature slots at their bottom sides. The number of turns Na is smaller than the number of turns Nb.

An electric motor with shaft, rotor and stator. The stator has a pair of magnets amd the rotor has a number of rotor poles, and the same number of electrically isolated pole windings and inter-pole spaces. The motor has first and second commutators, each divided into equally arc spaced commutator segments, the same number as the number of rotor poles.

Each winding begins at a segment of the first commutator, passes through a first inter-pole space and back through an inter-pole space two spaces counterclockwise of the first space to complete a first winding turn, and after pre-selected number of winding turns, passes back through an inter-pole space three spaces counterclockwise of the first space for a second same number of winding turns as the first pre-selected number. The winding is completed at an segment of the second commutator arc-aligned at the same arc degree on the rotor shaft with the first commutator.

In the electric motor the two magnets are separate by a gap between them such that a line through the gap is 90 degrees out of alignment with a line between a pair of oppositely signed motor brushes.

The electric motor has two brush sets, with each of the two brush sets each having a pair of oppositely disposed brushes electrically isolated from each other and on opposite sides of the commutator.

A method for parallel simultaneous internal generation of an output current in a motor, while the motor is drawing current to spin a motor shaft is also presented.

An electric motor with shaft, rotor and stator. The stator has a pair of magnets amd the rotor has a number of rotor poles, and the same number of electrically isolated pole windings and inter-pole spaces. The motor has first and second commutators, each divided into equally arc spaced commutator segments, the same number as the number of rotor poles.

Each winding begins at a segment of the first commutator, passes through a first inter-pole space and back through an inter-pole space two spaces counterclockwise of the first space to complete a first winding turn, and after pre-selected number of winding turns, passes back through an inter-pole space three spaces counterclockwise of the first space for a second same number of winding turns as the first pre-selected number. The winding is completed at an segment of the second commutator arc-aligned at the same arc degree on the rotor shaft with the first commutator.

In the electric motor the two magnets are separate by a gap between them such that a line through the gap is 90 degrees out of alignment with a line between a pair of oppositely signed motor brushes.

The electric motor has two brush sets, with each of the two brush sets each having a pair of oppositely disposed brushes electrically isolated from each other and on opposite sides of the commutator.

A method for parallel simultaneous internal generation of an output current in a motor, while the motor is drawing current to spin a motor shaft is also presented.

The invention relates to a synchronous electric machine for aircraft, which comprises a stator and a wound rotor inserted into the stator, the stator comprising two sets of stator coils intended to be connected to different power converters, and the wound rotor comprising a rotor shaft and two rotor coils each intended to be supplied with a different supply current.

The two sets of stator coils are arranged in the stator in such a way that when a first set of stator coils fails, the second set of stator coils cooperates with at least the second rotor coil supplied with the associated supply current in order to generate a mechanical torque on the rotor shaft, and so that the power converter connected to the first set of stator coils does not deliver any electrical power.

The invention relates to a synchronous electric machine for aircraft, which comprises a stator and a wound rotor inserted into the stator, the stator comprising two sets of stator coils intended to be connected to different power converters, and the wound rotor comprising a rotor shaft and two rotor coils each intended to be supplied with a different supply current.

The two sets of stator coils are arranged in the stator in such a way that when a first set of stator coils fails, the second set of stator coils cooperates with at least the second rotor coil supplied with the associated supply current in order to generate a mechanical torque on the rotor shaft, and so that the power converter connected to the first set of stator coils does not deliver any electrical power.