A motor includes a stator, a rotor and a case. The rotor includes a first rotor core, a second rotor core, and a field magnet. Each of the first rotor core and the second rotor core includes a core base and a plurality of claw poles. The field magnet is located between the core bases. The case includes a cylindrical yoke housing and a lid. To balance magnetic flux from the first rotor core with magnetic flux from the second rotor core, the distance between the rotor and the stator is varied from the distance between the rotor and the yoke housing or the teeth of the stator are shaped to enable magnetic saturation.

In an electric rotating machine which can improve rotating machine efficiency by suppressing a harmonic component of rotor magnetomotive force and reducing harmonic core loss, a permanent magnet is furnished in some of inter-magnetic pole portions, the inter-magnetic pole portion being formed between a first claw-shaped magnetic pole portion and a second such pole portion; the shapes of first and second chamfered portions provided in the inter-magnetic pole portion where the permanent magnet is inserted, differ from those of first and second chamfered portions provided in an inter-magnetic pole portion having no permanent magnet inserted; or the shapes of a first and second magnetic flux adjusting portions provided in the inter-magnetic pole portion where the permanent magnet is inserted, differ from those of first and second magnetic flux adjusting portions provided in the inter-magnetic pole portion where no permanent magnet is inserted.

A claw-pole motor comprising a non-magnetic rotary shaft having a longitudinal axis, a plurality of flux concentrators extending along the longitudinal axis of the rotary shaft, and a plurality of magnetic claw poles extending along the longitudinal axis of the rotary shaft, each of the plurality of flux concentrators alternating with each of the magnetic claw poles about the rotary shaft, and a stator having a plurality of coil assemblies, each coil assembly including a solenoid coil and an enclosure having a upper portion and lower portion, the upper portion and the lower portion of the enclosure having alternating stator teeth about the longitudinal axis.

A rotating electrical machine includes a rotor and a magnet unit. The rotating electrical machine also includes a cylindrical stator and a housing. The stator is equipped with a stator winding made up of a plurality of phase windings. The stator is arranged coaxially with the rotor and faces the rotor. The housing has the rotor and the stator disposed therein. The rotor includes a cylindrical magnet retainer to which the magnet unit is secured and an intermediate portion which connects between a rotating shaft of the rotor and the magnet retainer and extends in a radial direction of the rotating shaft. A first region located radially inside an inner peripheral surface of a magnetic circuit component made up of the stator and the rotor is greater in volume than a second region between the inner peripheral surface of the magnetic circuit component and the housing in the radial direction.

A rotor of a rotary electric machine includes first and second magnetic poles, and first and second holding members. The first magnetic pole has a first annular portion and first claw portions. The first claw portions extend axially from the first annular portion, and are spaced apart from each other in a circumferential direction. The second magnetic pole includes a second annular portion and second claw portions. The second annular portion is disposed on a first side in an axial direction to the first annular portion. The second claw portions extend axially from the second annular portion, and are disposed alternately with the first claw portions in the circumferential direction. The first holding member includes a first engaging portion disposed radially outward to a tip-portion of each first claw portion. The second holding member includes a second engaging portion disposed radially outward to a tip-portion of each second claw portion.

A rotor for a rotating electric machine includes a field core having a plurality of claw-shaped magnetic pole portions, a field coil wound on the field core, and a hollow cylindrical core member disposed to cover radially outer peripheries of the claw-shaped magnetic pole portions of the field core. The core member has a plurality of first electrically-insulating portions that are spaced at first intervals in an axial direction of the core member. Each of the claw-shaped magnetic pole portions of the field core has a radially outer peripheral surface abutting the core member and a plurality of second electrically-insulating portions provided on the radially outer peripheral surface. The second electrically-insulating portions are spaced at second intervals in the axial direction of the core member.

In a rotor for a rotary electric machine, a claw pole assembly includes first claw poles and second claw poles. An annular cover member covers the outer circumferential surfaces of the first and second claw poles. The pole cover segments and the inter-pole cover segments are alternately arranged in the circumferential direction of the rotor. Each of the pole cover segments has a circular-arc shape around a first center, and each of the inter-pole cover segments has a circular-arc shape around a second center different from the first center. The first circumferential width of each pole cover segment and the second circumferential width of a corresponding one of the inter-pole segment adjacent to the pole cover segment have a predetermined ratio. The predetermined ratio varies in an axial direction of the rotor.

A rotor for a rotating electric machine includes a field core having a plurality of claw-shaped magnetic pole portions, a field coil wound on the field core, and a hollow cylindrical core member disposed to cover radially outer peripheries of the claw-shaped magnetic pole portions of the field core. The core member is formed of a plurality of soft-magnetic bodies that are laminated in an axial direction of the core member. At least some of the soft-magnetic bodies forming the core member are fixed to one another by at least one staking portion that is formed along the axial direction of the core member.

A rotary electrical machine includes a switch for supplying power to a field winding and a controller. A ratio of an on-time to a switching cycle of the switch, i.e., a duty ratio which is larger than the duty ratio corresponding to the field current that gives the maximum reduction amount of the inductance of the field winding with respect to an increasing amount of the field current in a range that the field current can take and which has a predetermined value less than 100%. The controller calculates the duty ratio on the condition that an upper limit of the duty ratio is set as the predetermined value and turns on/off the switch based on the calculated duty ratio, and sets the predetermined value to be larger as a rotation speed of a rotor is higher, or as a d-axis current flowing through an armature winding is larger.

The invention relates to a rotor for a rotating electrical machine, comprising: a central shaft, an annular core coaxial to the shaft, a winding extending radially around the core, a first claw-pole and a second claw-pole arranged axially on each side of the core and the winding. Each claw-pole of the rotor comprises a plurality of triangular teeth having a base that is tangent to the pole wheel and comprising a first side, denoted a, and a second side, denoted b. The ratio of 1-a/b is between 0 and 0.5, or 0 and −0.5. The tip of the teeth of one of the claw-poles is equidistant between the ends of the bases adjacent to the tip of the teeth of the other claw-pole.