Abstract:
A rotary electric motor is formed within a cylindrical rotor housing structure that surrounds an annular stator ring. The permanent magnet rotor is configured in an annular ring coaxial with, and outside of, the stator. The stator ring contains a plurality of wound core segments that are ferromagnetically isolated from each other. The core segments are secured to a rigid skeletal structure that is centrally fixed to a stationary shaft. The stator support structure is formed of spine members that extend radially away from the center. U-shaped plates at the outer ends of the spine members engage adjacent pair of stator segments. Within the inner periphery of the stator ring, space is provided within which motor control circuitry and battery power supply may be incorporated.
Abstract:
A hybrid synchronous electric machine driven by a traverse magnetic flux has a rotor and a stator, its rotor armature (11) has a heavy−weight copper ring (12) in the proximity of a motor active component, and a lateral insulation gap (22) is formed in a toothed iron rings (14, 15), component parts of the rotor. Since an eddy current generated on iron rings (14, 15) is obstructed by the insulation gap (22) formed on the rings, an eddy current loss is small. Eddy currents produced on motor passive components ( such as a rotor armature (11), a stator armature (1), and ball bearing (9)) can be neglected , because all the divergent magnetic fluxes outside a motor passive area are cancelled out by a current induced within the copper ring (12), thereby minimizing an eddy current loss to realize an energy−efficient hybrid synchronous electric machine.
Abstract:
In order to improve the torque per weight ratio in electrical machines for a lower price it is proposed to use a segmented stator design. The segmented stator design is based on general E shaped cores traditionally used for single-phase transformers and inductors. The E-cores has a coil around the centred leg and is assembled parallel to the rotor axis, which means it will function with the transverse flux principle. A radial flux principle can also be performed with the E-cores if the E-cores are divided into two U-sections with a full pitch winding in between them. A clear extra advantage with the E-cores is short flux paths meaning less steel has to be magnetised. For a low volume production standard E-cores can be used making the investment in production facilities smaller. The E-core machines using the transverse principle can have different pole-shapes such the normal force between the rotor and stator are significantly reduced. This makes unequal designs like a 3 stator- and 2 rotor-pole design practical possible.
Abstract:
A stepping motor (10), comprising a rotor (3) formed of a permanent magnet (2) having multiple poles magnetized in circumferential direction and two or more stator yokes (5a, 5b) disposed on the outer periphery of the rotor (3) and forming a multiple-phase field of two or more phases, wherein the cross sections of the portions of the stator yokes leading to a magnetic pole surface (51a) is reduced less than the areas of the stator yokes on the magnetic pole surface (51a) or an intermediate magnetic substance (9) magnetically independent of the stator yokes (5a, 5b) on both sides thereof is disposed so as to reduce the detent torque of the stepping motor, and a stator yoke (5) is formed of two-divided members and both divided members (51, 52) are connected to each other inside a winding bobbin (7) so as to increase the quality and the workability of assembly.
Abstract:
This invention relates to an electric multiple motor/generator with axial magnetic flux. Thus a generator/motor or electrical machine in which a magnetic flux path through one or more pole legs or pole cores surrounded by current windings or coils is provided. This allows a high density of the magnetic flux to be passed through the pole legs or cores, which results in a low consumption of material for the pole legs or pole cores compared with prior art machines, where for example a large stator diameter may be needed in order to conduct a high magnetic flux. Additionally the generator/motor or electrical machine is very efficient both at a low and a high number of revolutions. According to another aspect of the invention a multiple phase output without enlarging the diameter of the generator is provided.
Abstract:
The proposed electrical machine possesses several winding strands in the stator in the form of annular coils arranged coaxially with the motor axis, which are supplied with current, in the motor operating mode, via electronic control elements, and series of C-shaped soft iron elements in the stator, which are arranged around the periphery and separated by identical intervals, extend with their limbs transversally in relation to the winding strands and are provided between the limbs with groove-like recesses which the winding strands run. A rotor without windings has a number of partial rotors assigned to individual winding strands; the partial rotors are provided with magnet circuit elements comprising permanent magnets and flux-conducting soft iron elements, twice as many of the latter being present as in the stator and engaging in the groove-like recesses. This arrangement creates a first (inner) and a second (outer) air gap between the limbs of the soft iron elements and the magnet circuit elements. The soft iron element (Cp) is provided with an (inner) pole lug (Pi) directed at the magnet circuit elements (Wei, M) at the first (inner) air gap and, at a distance within a double pole pitch, another first (Pa1) and second (Pa2) (outer) pole lug (Pa) directed at the magnet circuit (Wei, M) at the second (outer) air gap, so that the soft iron element (Cp) matches a circumferential length of the double pole pitch and over the greater part of its circumference, has a larger cross-section than that of the pole lugs (Pa, Pi).