A multi-rotor electric machine includes a first rotor, a stator, and a second rotor. The stator is disposed concentric with the first rotor and is disposed radially outward from the first rotor. The stator has a first plurality estate or windings disposed proximate first stator teeth of the stator. The stator has a second plurality of stator windings disposed proximate second stator teeth of the stator. The second rotor is disposed concentric with and is disposed radially outward from the stator. The second rotor is rotatable relative to the first rotor.

A rotor core lamination is provided. The rotor core lamination includes a plurality of salient poles. Each of the salient poles includes: a pole body having a central axis in a radial direction of the rotor core lamination; and a pole shoe extending radially outward from the pole body, wherein the pole shoe has a pole shoe arc, and a central point of the pole shoe arc is offset from the central axis.

In a rotating electric machine, a rotor includes a field core, a field coil and permanent magnets. The field core has a boss portion and claw-shaped magnetic pole portions. Each of the permanent magnets is arranged between one circumferentially-adjacent pair of the claw-shaped magnetic pole portions. A d-axis magnetic circuit and a magnet magnetic circuit share a magnetic path in at least parts thereof. Along the d-axis magnetic circuit, magnetic flux generated by the magnetomotive force of the field coil flows through the boss portion, one pair of the claw-shaped magnetic pole portions and a stator core. Along the magnet magnetic circuit, magnetic flux generated by the magnetic force of a corresponding one of the permanent magnets flows. The relationship of Ast>Af is satisfied, where Ast is a magnetic path cross-sectional area of a stator and Af is a magnetic path cross-sectional area of the rotor.

A rotary electric machine is equipped with a stator and a rotor. The rotor has a d-axis magnetic circuit that is produced by a magnetomotive force of a field winding, and magnet magnetic circuits that are produced by a magnetic force of permanent magnets. The d-axis magnetic circuit and a q-axis magnetic circuit have at least a part thereof that is common to both. The permeance of the d-axis magnetic circuit is smaller than the permeance of the q-axis magnetic circuit, when a load is being applied to the rotor. A control apparatus of the rotary electric machine has a switching circuit that controls the field current in the field winding, and a control section that makes the switching frequency of the switching circuit become higher when the field current is above a threshold value than when the field current is less than or equal to the threshold value.

The present invention provides a portable power storage device, and in particular, a portable power storage device with a self-generation and nano-capacitor storage structure. The portable power storage device includes: opposite fixed magnet plates disposed on both sides of a main body and having a plurality of radially arranged induction magnet bodies; and a rotating coil plate disposed between the opposite fixed magnet plates and having a plurality of radially arranged coil bodies to perform mutual induction action with the induction magnet bodies, such that when the rotating coil plate is rotated or reciprocated, electric charges are induced in the coil bodies by the induction magnet bodies to generate current, thereby electricity may be easily generated and used at all times regardless of the location, as well as the stored electricity may be output and used in a portable electric device as necessary.

A rotating electric machine includes a stator and a rotor. The rotor includes: a field core having at least one boss portion, a pair of disc portions and a plurality of claw-shaped magnetic pole portions; a field coil arranged between the at least one boss portion and the claw-shaped magnetic pole portions; a plurality of permanent magnets each of which is arranged between one circumferentially-adjacent pair of the claw-shaped magnetic pole portions; and a ring-shaped fixing member fixed to radially inner parts of the claw-shaped magnetic pole portions to support the claw-shaped magnetic pole portions from the radially inner side. Moreover, a d-axis magnetic circuit and a magnet magnetic circuit are at least partially coincident with each other to share a common circuit portion. When field current is supplied to the field coil, the permeance of the d-axis magnetic circuit is lower than the permeance of a q-axis magnetic circuit.

A rotary electrical machine includes: a rotary electrical machine having a stator and a rotor; and a control device. The rotor includes: a field core having a boss part and claw-shaped magnetic pole parts; a field winding that is wound on the boss part; and permanent magnets that are arranged between the claw-shaped magnetic pole parts. A d-axis magnetic circuit formed by magnetomotive force of the field winding and at least part of first and second magnet magnetic circuits formed by magnetic force of the permanent magnets are shared. When an electrical load is connected to the rotor, a permeance Prt of the d-axis magnetic circuit is set to be smaller than a permeance Pst of the q-axis magnetic circuit. The control device performs phase control such that the rotary electrical machine performs either power running or regeneration.

A rotary electrical machine includes: a rotary electrical machine having a stator and a rotor; and a control device. The rotor includes: a field core having a boss part and claw-shaped magnetic pole parts; a field winding that is wound on the boss part; and permanent magnets that are arranged between the claw-shaped magnetic pole parts. A d-axis magnetic circuit formed by magnetomotive force of the field winding and at least part of first and second magnet magnetic circuits formed by magnetic force of the permanent magnets are shared. When an electrical load is connected to the rotor, a permeance Prt of the d-axis magnetic circuit is set to be smaller than a permeance Pst of the q-axis magnetic circuit. The control device performs phase control such that the rotary electrical machine performs either power running or regeneration.

A rotor includes: a field core having a plurality of claw-shaped magnetic pole portions; a tubular member arranged to cover radially outer surfaces of the claw-shaped magnetic pole portions; a field winding wound on the field core; and a plurality of magnet units each of which includes a permanent magnet arranged between one circumferentially-adjacent pair of the claw-shaped magnetic pole portions and a magnet holder that holds the permanent magnet. The magnet holder has: a pair of circumferential movement restricting portions provided to restrict circumferential movement of the permanent magnet; a first radial movement restricting portion provided to restrict radially inward movement of the permanent magnet; and a pair of second radial movement restricting portions provided to restrict radially inward movement of the magnet holder. Each of the magnet units has a tubular-member abutting portion that abuts the radially inner surface of the tubular member.

A rotor includes: a field core having a plurality of claw-shaped magnetic pole portions; a tubular member arranged to cover radially outer surfaces of the claw-shaped magnetic pole portions; a field winding wound on the field core; and a plurality of magnet units each of which includes a permanent magnet arranged between one circumferentially-adjacent pair of the claw-shaped magnetic pole portions and a magnet holder that holds the permanent magnet. The magnet holder has: a pair of circumferential movement restricting portions provided to restrict circumferential movement of the permanent magnet; a first radial movement restricting portion provided to restrict radially inward movement of the permanent magnet; and a pair of second radial movement restricting portions provided to restrict radially inward movement of the magnet holder. Each of the magnet units has a tubular-member abutting portion that abuts the radially inner surface of the tubular member.