A permanent magnet electrical machine has a rotor supporting a circumferential row of permanent magnets and a stator coaxial with the rotor and having a circumferential row of teeth carrying respective coil windings. The teeth provide paths for magnetic flux from the magnets, thereby electromagnetically linking the magnets and coils when the rotor rotates. The teeth have respective core portions on which the coil windings are mounted, and respective tip portions located between the core portions and the rotor. The tip portions are controllably rotatable between a first position where the tip portion and the core portion are angularly aligned to enhance magnetic flux linkage between the magnets and the coils, and a second position in which the tip portion is rotated out of angular alignment with its core portion to reduce magnetic flux linkage between the magnets and the coils. The tip portions are biased to the second position.

A magnet motor has a stator formed from a laminated core provided with windings to form phases and a rotor provided with magnets distributed angularly around at least one section of the rotor and pivotably received in the housing of the stator. The stator has a length greater than a length of said section of the rotor and the rotor is provided with at least one ring made from magnetic material that adjoins said section and is received in the housing of the stator. A drive device having a plurality of motors and a method for producing such a motor are also provided.

A generator with relatively high (Length/Diameter) aspect ratio, which may be mounted within the rotating mast of a helicopter, and which may generate power that is conditioned by a rotating power conditioning unit and delivered to the rotating rotor blades without the use of slip rings, is disclosed. The generator may be arranged to take advantage of the available space within the mast. Temperature of the mast and generator may be controlled by varying the wall thickness of the mast wall and using cooling fins on the mast and a cooling dome.

A multiple radial gap BLPMDC/BLPMAC motor/generator suitable for direct drive wind or other fluid medium driven turbines or other rotary machine application. Each rotor and stator segment are housed in a fixture having an intermediate interior ramp angularly inclined at an angle of from about 10 to about 80 to cause the rotor/stator segments to interact at the axis of rotation of the fluid medium driven rotating machine at the same angle.

A power tool is provided including a housing; and an electric brushless DC (BLDG) motor housed inside the housing. The motor includes a motor housing having a substantially cylindrical body and a back plate, the cylindrical body of the motor housing defining a slot at or proximate the back plate; a stator housed within the motor housing; a rotor pivotably arranged inside the stator, the rotor including a rotor shaft, a rotor core rotatably mounted on the rotor shaft and housing rotor magnets therein, and a sense magnet ring affixed to the rotor shaft and having magnets aligned with the rotor magnets; and a positional sensor board having positional sensors mounted thereon, the positional sensor board being received through the slot of the motor housing to dispose the positional sensors in close proximity to the sense magnet ring.

A system includes energy modules that output power to an energy management bus based on load demands. An energy module includes energy cells enclosed within a module housing that provide power to the energy management bus and rotation assemblies attached on opposite ends of the module housing that provide rotational movement for the energy module. The energy module includes a local controller that controls power output from the energy cells to the energy management bus, engages a self-driving mode in response to receiving a disconnection signal from a central controller, and controls movement of the energy module in the self-driving mode to a predetermined location via the first rotation assembly and the second rotation assembly. The central controller receives a current module status from the energy modules and controls a configuration of the energy modules providing power to the energy management bus based on the current module status.

An assembly made up of power electronics unit including three-phase outputs and a three-phase motor including three-phase inputs, wherein the assembly includes N three-phase outputs and N three-phase inputs with N>1, the three-phase inputs of the three-phase motor are opposite the three-phase outputs of the power electronic unit, the three-phase outputs and the three-phase inputs are located at the outer periphery of the power electronic unit and at the outer periphery of the three-phase motor, respectively, and the shape and the perimeter of the outer periphery of the three-phase motor are identical to those of the outer periphery of the power electronic unit.

Provided is a rotor for a rotating electrical machine that includes a rotor body having an axis of rotation and at least one pair of circumferentially-adjacent pole modules each having a main body and a permanent magnet. At least one of each pair of pole modules is rotatable relative to the rotor body between a first position for normal operation where the magnetic fields generated by the permanent magnets of each pair of pole modules extend outside the rotor body and a second position for fault operation where the magnetic fields generated by the permanent magnets of each pair of pole modules do not extend substantially outside the rotor body.

An electric drive axle, including: a first and a second drive shaft being axially aligned, an electric drive module and a differential module, wherein the electric drive module includes an electric motor and a planetary gear set, wherein both the electric motor and the planetary gear set are coaxially arranged about the drive shafts, wherein output means of the electric drive module is connected to input means of the differential module, wherein the input means is or can be set in drive connection with the drive shafts, such that a drive force generated by the electric drive module can be transferred to the first and/or second drive shaft, and a coupling between the output means and the input means, wherein the coupling is arranged to allow for the output means and the input means to slide into engagement in an axial direction.

An electrical machine has a variable reluctance rotor, and a stator formed as an annular array of stator segments. The reluctance of the rotor-to-stator magnetic flux path varies with rotor position whereby the stator segments are magnetically energizable to rotate the rotor. The stator segments are arranged in the array such that, when energized to rotate the rotor, they produce an unbalanced force on the rotor. The machine further has a compensator including one or more balancing segments which are configured to be magnetically energizable to produce a balancing force on the rotor which balances the unbalanced force. The reluctance of the rotor-to-compensator magnetic flux path is substantially invariant with rotor position.