Abstract:
Disclosed is an asynchronous rotating electric machine in which none of the electrical windings is rotating, said machine having a homopolar compound structure. The machine comprises: a rotor including magnetic flux return parts; and a stator formed by a pair of armatures and a magnetic wedge connecting the armatures and providing the magnetic flux in the direction of the axis of rotation, an annular induction coil being supplied with alternating current and housed between the air gap and the wedge, and one or two armature coils being received by one or both of the armatures generating an alternating magnetic flux.
Abstract:
A rotor for an electrical machine, in particular synchronous reluctance machine, is provided. The rotor is formed as a cylindrical structure having a magnetically soft element formed with an even number of salient magnetic poles openings for forming magnetic flux barriers. The openings are at least partially filled with a diamagnetic and/or paramagnetic medium and the diamagnetic and/or paramagnetic medium may axially and tangentially fix the magnetically soft element relative to the rotor. A method for producing such a rotor and apparatus using the rotor, including a reluctance motor, in particular a synchronous reluctance motor, that uses the rotor are provided.
Abstract:
Disclosed herein is a design for flux switching machines with one or more armature windings which can deliver controlled torque, in either selected direction on start up, without the use of a mechanical position sensor. Flux switching machines without sensors can operate equally well in either direction. The invention discloses design features for such machines which improves the torque profile of the motor with angle. In three phase machines this delivers higher torque and lower ripple torque. In single phase flux switching machines the invention allows the rotor to be placed in a position where maximum torque can be delivered in either direction by selection of either positive or negative armature current. Rotor slotting is introduced to create a path of low permeability across a rotor tooth with minimal impact on the normal torque producing flux paths. Asymmetry of stator slots is used to further create a stable rotor position when energized by predominantly field means or armature means. Starting of the rotor from this stable position can be achieved in either direction. The method is suitable for starting permanent magnet flux switching motors. The invention results in low cost single phase motors which can start and run in either direction and three phase flux switching motors with improved performance over the prior art.
Abstract:
A thin motor includes a rotor 1 having permanent magnets and a stator having windings. In winding installation portions of the stator core, recesses are formed by reducing the thickness of the stator core, and the windings are accommodated in the recesses.
Abstract:
Homopolar electric machine, characterized in that its structure is double, its rotor and its stator being simultaneously homopolar, and in that it includes a stack of pairs of simple homopolar stators, forming monophasing elementary machines, or in a reverse version, the elementary machines being powered with AC current; the rotor is common to all these stators, and is passive, that is to say composed completely or partially of ferromagnetic materials.
Abstract:
Electrical machines, for example transverse flux machines and/or commutated flux machines, may be “balanced” to achieve reduced overall cogging torque via utilization of one or more cogging torque reduction devices. Cogging torque reduction devices may be configured and/or otherwise customized in order to reduce and/or minimize cogging torque in an electrical machine, by generating a counteracting cogging torque waveform that at least partially counteracts and/or cancels the initial cogging torque waveform of the electrical machine.
Abstract:
A high temperature motor has a stator with poles formed by wire windings, and a rotor with magnetic poles on a rotor shaft positioned coaxially within the stator. The stator and rotor are built up from stacks of magnetic-alloy laminations. The stator windings are made of high temperature magnet wire insulated with a vitreous enamel film, and the wire windings are bonded together with ceramic binder. A thin-walled cylinder is positioned coaxially between the rotor and the stator to prevent debris from the stator windings from reaching the rotor. The stator windings are wound on wire spools made of ceramic, thereby avoiding need for mica insulation and epoxy/adhesive. The stator and rotor are encased in a stator housing with rear and front end caps, and rear and front bearings for the rotor shaft are mounted on external sides of the end caps to keep debris from the motor migrating into the bearings' races.
Abstract:
A transverse flux, switched reluctance motor includes a stator, a rotor mounted for rotation relative to the stator about an axis, and a plurality of phased coils. The stator and rotor are spaced apart from each other by a gap and a first phased coil is positioned to extend at least partially across the gap.
Abstract:
A motor 1 comprises a stator 2, a rotor 10 mounted for rotation about a rotor axis 50 in the stator 2, a pole 11 of the stator 2, a winding on the stator pole 11, and at least one pair of salient poles 10a-d of the rotor 10. The rotor 10 is magnetised so that said rotor poles 10a-d are oppositely magnetised. The motor 1 further comprises an electrical circuit being provided with control means to produce an alternating magnetic field in the pole 11 of the stator 2 to attract each pole 10a-d of the rotor 10 as it approaches the pole 11 and to repel each pole 10a-d of the rotor 10 as it moves away from the pole 11, said field alternating as many times per revolution of the rotor 10 as there are poles of the rotor 10. Each pole 10a-d of the rotor 10 is magnetised by a permanent magnet 72 carried by said pole 10a-d, wherein the magnet 72 has a magnet axis of magnetisation 80, which magnet axis 80 is inclined with respect to a radial direction 82 of said rotor axis 50.
Abstract:
An energy conversion system that converts electrical energy to mechanical energy, and with certain power supplies can convert solar energy into mechanical energy. It operates on a timed direct current pulse and its configuration causes a magnetic field to align with a rotational shaft, two rotors, and one or more stationary field pieces each having a coil. One rotor has a spherical configuration and the second rotor mounted on the same shaft has an arcuate configuration with truncated ends. A coil can be mounted between the two rotors. The offset position of field coils allows for higher torque in low to high rpm ranges. The spherical rotor shape was chosen for ease of construction, mass in a condensed space, less gyroscopic effects than flat flywheels, and positive effects of placement in magnetic circuit. Since there is only one major moving part, the present invention is simple, long-lasting, and virtually problem-free.