A brushless winding field rotational electric machine positioned between a starting device and a case enclosing the starting device includes: a stator, which is held to the case, including an alternating-current coil configured to generate a rotation magnetic field by alternating current; a field core, which is held to the case, including a field coil to be excited by direct current; and a rotor disposed on an outer periphery of the starting device and rotatably held about a rotational axis relative to the stator and the field coil. The rotor includes a connection portion to be connected to a synchronized rotation member configured to rotate in synchronization with an engine along the rotational axis, on a facing surface to the synchronized rotation member.

The current invention relates to a magnetic pole arrangement comprising a plurality of magnetic pole assembles arranged back-to-back along a longitudinally extending axis of rotation X. Each providing flux to an air gap G. Each magnetic pole assembly comprising one or more magnetic poles pieces and two components of magnetic flux. The first component of magnetic flux provided by a plurality of axially magnetised axially displaced magnets arranged in circumferentially extending arrays. The second component of magnetic flux provided by a plurality of circumferentially magnetised magnets circumferentially spaced around the axis of rotation X.

The current invention relates to a magnetic pole arrangement comprising a plurality of magnetic pole assembles arranged back-to-back along a longitudinally extending axis of rotation X. Each providing flux to an air gap G. Each magnetic pole assembly comprising one or more magnetic poles pieces and two components of magnetic flux. The first component of magnetic flux provided by a plurality of axially magnetised axially displaced magnets arranged in circumferentially extending arrays. The second component of magnetic flux provided by a plurality of circumferentially magnetised magnets circumferentially spaced around the axis of rotation X.

A claw pole synchronous machine includes a housing and a rotor being rotatable relative to the housing and having a plurality of first claw poles circumferentially alternating with a plurality of second claw poles. The plurality of first claw poles are axially overlapping with the plurality of second claw poles. At least two DC excitation coils are fixed relative to the housing and configured to provide a magnetic field to the rotor. A stator is fixed to the housing.

A claw pole synchronous machine includes a housing and a rotor being rotatable relative to the housing and having a plurality of first claw poles circumferentially alternating with a plurality of second claw poles. The plurality of first claw poles are axially overlapping with the plurality of second claw poles. At least two DC excitation coils are fixed relative to the housing and configured to provide a magnetic field to the rotor. A stator is fixed to the housing.

A field coil type rotating electric machine includes a stator and a rotor. The stator includes a stator core, stator teeth arranged in a circumferential direction and each radially protruding from the stator core, and a stator coil wound on the stator teeth. The rotor includes a rotor core, main poles arranged in the circumferential direction and each radially protruding from the rotor core, and a field coil wound on the main poles. Each of the stator teeth and the main poles extends in an axial direction. Each of the main poles has a pair of main-pole end portions located respectively at circumferential ends of the main pole and both radially facing the stator. For each of the main poles, in at least one of the main-pole end portions of the main pole, there is formed at least one cut for part of an axial length of the main pole.

A field coil type rotating electric machine includes a stator and a rotor. The stator includes a stator core, stator teeth arranged in a circumferential direction and each radially protruding from the stator core, and a stator coil wound on the stator teeth. The rotor includes a rotor core, main poles arranged in the circumferential direction and each radially protruding from the rotor core, and a field coil wound on the main poles. Each of the stator teeth and the main poles extends in an axial direction. Each of the main poles has a pair of main-pole end portions located respectively at circumferential ends of the main pole and both radially facing the stator. For each of the main poles, in at least one of the main-pole end portions of the main pole, there is formed at least one cut for part of an axial length of the main pole.

Also disclosed is a method for exciting a generator of a direct current power supply with a controller. The method includes receiving a phase voltages associated with multiphase output of the generator. The method includes determining a maximum line-to-line voltage based on the phase voltages. The method includes operating an exciter winding driver with an oscillating signal generated according to the maximum line-to-line voltage.

Also disclosed is a method for exciting a generator of a direct current power supply with a controller. The method includes receiving a phase voltages associated with multiphase output of the generator. The method includes determining a maximum line-to-line voltage based on the phase voltages. The method includes operating an exciter winding driver with an oscillating signal generated according to the maximum line-to-line voltage.

A field winding type rotary machine includes a stator having a stator core and a stator coil wound on the stator core, a rotor having a rotor core and a rotor field coil wound on the rotor core, and a rectifier element connected between both ends of the rotor field coil. The field winding type rotary machine includes a capacitor having a first terminal connected to an anode terminal of the rectifier element and a second terminal connected to any point of the rotor field coil.