A wave energy conversion device includes a permanent magnet generator, a first driving component and a second driving component. The permanent magnet generator includes a stator structure and a rotor structure. The stator structure includes a stator body. The rotor structure includes a rotor body. The rotor body is disposed inside the stator body in a swinging manner or in a rotatable manner. The first driving component is coupled to the rotor structure. The second driving component is coupled to the stator structure. The wave energy conversion device of the present invention requires a low speed/angle of a swinging/rotating movement of the rotor body relative to the stator body to generate electricity, which facilitates electricity generation from wave energy.

Methods and systems are provided for operating an electric motor including multiple rotor and stator sections. In one example, a system may include the multiple rotor sections configured to be mechanically coupled and decoupled from each other concurrently with multiple stator sections configured to be electrically coupled and decoupled from each other, within certain regimes of operation of the electric motor.

A soft magnetic alloy is provided. The alloy consists essentially of 5 wt %Co25 wt %, 0.3 wt %V5.0 wt %, 0 wt %Cr3.0 wt %, 0 wt %Si3.0 wt %, 0 wt %Mn3.0 wt %, 0 wt %Al3.0 wt %, 0 wt %Ta0.5 wt %, 0 wt %Ni0.5 wt %, 0 wt %Mo0.5 wt %, 0 wt %Cu0.2 wt %, 0 wt %Nb0.25 wt % and up to 0.2 wt % impurities.

A motor able to prevent axial displacement of a rotor in a simple structure without increasing the number of parts of the motor. The motor includes a rotor including a shaft, a housing configured to support the shaft rotatably and movably in a limited manner in an axial direction, a flange disposed on an axially outside of the housing and configured to rotate integrally with the shaft, the flange projecting radially outward from the shaft and being configured to prevent a foreign object from entering the housing, and a temporary tacking structure provided in at least one of the flange and the housing, and configured to temporarily tack the housing and the flange to each other in the axial direction.

A motor able to prevent axial displacement of a rotor in a simple structure without increasing the number of parts of the motor. The motor includes a rotor including a shaft, a housing configured to support the shaft rotatably and movably in a limited manner in an axial direction, a flange disposed on an axially outside of the housing and configured to rotate integrally with the shaft, the flange projecting radially outward from the shaft and being configured to prevent a foreign object from entering the housing, and a temporary tacking structure provided in at least one of the flange and the housing, and configured to temporarily tack the housing and the flange to each other in the axial direction.

Provided is a rotating electrical machine that has superior rotor strength and can be manufactured at low cost, wherein torque generated by a rotor can be increased. Two holes are formed in a circumferential direction in each pole in a rotor. The two holes communicate with an outer periphery of the rotor, and an outer peripheral edge portion on an outer side in a radial direction of the rotor of the two holes is connected via a center bridge between the two holes to a core portion on an inner side in the radial direction of the rotor in each pole. The center bridge is demagnetized, or the permeability thereof is reduced. Consequently, leakage flux passing through the center bridge can be reduced, even when the width of the center bridge is increased.

A multi-phase electric machine having plurality of windings are mounted on the stator core that define a plurality of phases wherein, for each phase, the windings include at least two parallel windings, each winding comprising a pair of continuous wires which are connected in series. For each pole, the parallel windings fill one or more central slots and two outer slots. Each winding fills each central slot twice the number of times that the winding fills each outer slot to thereby define a slot fill ratio of 2:1 between central slots and outer slots and wherein each wire of the wire pair forming a winding fills the slots in a ratio that differs from the slot fill ratio. Phase shift end loops shift the windings from one outer slot to the other outer slot. Position change end loops alter the relative positions of the parallel windings.

An apparatus for vibration reduction in a linear actuator includes one or more sets of counterweights, one or more enclosures configured to receive one set of counterweights for each enclosure, and a driving shaft configured to mount the one or more sets of counterweights. The one or more sets of counterweights are disposed symmetrically with respect to a plane that extends perpendicularly and longitudinally through a longitudinal axis of the linear actuator. The driving shaft extends perpendicularly and transversely through the longitudinal axis and the plane. A portion counterweight of a given set of counterweights may rotate clockwise and another portion counterweight of the given set of counterweights may rotate counterclockwise.

An apparatus for vibration reduction in a linear actuator includes one or more sets of counterweights, one or more enclosures configured to receive one set of counterweights for each enclosure, and a driving shaft configured to mount the one or more sets of counterweights. The one or more sets of counterweights are disposed symmetrically with respect to a plane that extends perpendicularly and longitudinally through a longitudinal axis of the linear actuator. The driving shaft extends perpendicularly and transversely through the longitudinal axis and the plane. A portion counterweight of a given set of counterweights may rotate clockwise and another portion counterweight of the given set of counterweights may rotate counterclockwise.

A rare earth magnet capable of reducing an eddy current loss by virtue of a low-cost, simple configuration, when mounted in a motor, is to be provided. The rare earth magnet can include a magnet body that includes a rare earth element and iron; and a resistive layer formed on at least one surface of the magnet body, the resistive layer comprising a rare earth element, iron, and oxygen and having an average volume resistivity of 10.sup.3 cm or more and a thickness of from 3 to 25 m.