Abstract: Unique systems, methods, techniques and apparatuses of an exciterless synchronous generator are disclosed. One exemplary embodiment is an exciterless synchronous generator comprising a stator, a rotor, and a startup excitation system. The stator includes a set of stator windings. The rotor includes an energy harvest winding, a DC power supply including a DC bus and coupled to the energy harvest winding, and a field winding coupled to the DC power supply. The startup excitation system comprises one of a magnetic field generation system structured to generate a magnetic field received by the energy harvest winding in response to a rotation of the rotor, wherein the magnetic field is converted to DC power with the DC power supply and transmitted to the field winding; or a rotor DC power source including and diode coupled in series across the DC bus.

Abstract: An electric motor may comprise a rotor and a stator comprising rotor and stator teeth, respectively. A non-uniform angular spacing or grouping of rotor teeth may facilitate desired rotational speeds of the rotor. In an embodiment, such non-uniform angular spacing may be such that for at least a subset of the rotor teeth comprising a first, second, and third rotor tooth, an angular spacing between the first and the second rotor teeth is at least twice an angular spacing between the second and the third rotor teeth.

Abstract: A method for generating and controlling power by means of at least one controlled permanent magnet machine (PMM) with a permanent magnet (PM) rotor and a stator with a magnetic flux diverter circuit for controlling the output of the PMM, comprises the steps of: rotating the PM rotor at a velocity sufficient to develop a high frequency alternating current (HFAC) power output from the stator; transforming the HFAC output to produce a desired non-HFAC power output; sensing desired power output parameters; generating a control signal responsive to the sensed parameters; and applying the control signal to the magnetic flux diverter circuit to control the desired power output.

Abstract: An electric machine for direct drive or braking applications with coils providing improved power efficiency and heat transfer is disclosed. The electric machine has a coil body and a winding with a plurality of turns wound on the coil body. Each of the various turns is located in a separate plane. Respective end sections of two different turns are connected by a connecting element, with a major directional component of the connecting element being oriented in an axial direction perpendicular to the plane of one of the two turns. Axially adjacent turns can thereby be connected to one another together. This arrangement reduces or eliminates empty spaces in the slots, particularly when the turns are made from flat wire.

Abstract: A multiphase motor comprises a plurality of ferromagnetic stator core segments, the core segments being substantially uniformly spaced around an axis of rotation and isolated from direct contact with each other. Each core segment forms at least one pair of poles having coils wound thereon to form a phase winding. Each stator phase winding is configured with a topology different from the topology of each of the other phase windings. Each phase winding has a different total number of coils from one or more of the other phase windings. Each phase winding comprises coils of a gauge different from the coil gauge of one or more of the other phase windings. Preferably, all of the phase windings have substantially the same total coil mass.

Abstract: In a ripple voltage detection system of a rectified waveform, a motor rotation detection structure is provided to increase ripple voltage by modifying number of windings, to bring cogging torque and number of parts to be equivalent, and to achieve automatic operation function. In the motor rotation detection structure used for automatic operation function of switching device such as vehicle power windows or the like, rotor of this motor includes an armature core with a plurality of slots arranged between teeth, a plurality of coils wound around each of the slots, a commutator with a plurality of segments connected to each of the coils and the like. Winding number of each of the coils is modified per each of the slots, and potential difference between the segments adjoining to each other and having different winding number is increased. So, the ripple voltage generated at a rotation of the armature core is increased in comparison with the segments having the same winding number.

Abstract: An electromagnetic transducer is disclosed that is lightweight and has a high power to weight ratio, with the transducer being capable of operation as an efficient motor, alternator or generator, and being particularly useful, for example, in connection with self-propelled vehicle applications such as passenger cars. The electromagnetic transducer can utilize a shell construction, which enhances heat removal, and includes a magnetic-flux producing assembly, having a plurality of spaced magnetic elements, and an armature assembly formed by a winding arrangement of dispersed conductive elements which are separated by flux carrying elements which, to the extent that such flux carrying elements are electrically conductive, are dispersed in one, two, or three dimensions to thus be dispersed-phase flux carrying elements. The armature conductors and flux carrying elements are dispersed to minimize creation of opposing induced currents, or eddy currents, depending on the effect produced on transducer operation.

Abstract: A stator for electrodynamic machines provides for more efficient design by reducing the total number of stator legs required for two-speed, two-phase motors and for generators producing electrical power at either of two frequencies while operating at a constant speed. This is accomplished by external switching, so that at one condition, all coils on all stator legs are energized in the normal symmetrical pattern, while at the other condition, all coils on all stator legs are energized in a non-symmetrical pattern.

Abstract: A motor structure and energization scheme provides a high efficiency electronically commutated reluctance motor that is characterized by less iron losses than conventional switched reluctance motors. Preferably, the motor operates without the reversal of the flow of flux in the member of the motor supporting the motor windings (e.g., the stator). Also, the flux switching frequency in the first member is reduced and preferably minimized. By eliminating flux reversals and minimizing the flux switching frequency, the electronically commutated reluctance motor is operable over a wide range of speeds with improved efficiency. Structurally, first and second members of the motor are mounted for relative movement. The first member includes unevenly spaced poles, whereas the second member includes evenly spaced poles. The poles of the first member are grouped into pairs separated by a space related to the even spacing of the poles on the second member.

Abstract: An improved magnetic core element for use in an electrodynamic rotary machine, and the method of making such a core element are disclosed. The core element, either a stator or rotor depending upon the design of the machine, is provided with a slot distribution such that when the rotor rotates with respect to the stator and a balanced energy field is provided therebetween, at least the lowest generated harmonics, will be substantially zero.

Abstract: An improved magnetic core element for use in an electrodynamic rotary machine. The core element, either a stator or rotor depending upon the design of the machine, is provided with a slot distribution such that when the rotor rotates with respect to the stator and a balanced energy field is provided therebetween, at least the lowest generated harmonics, will be substantially zero.

Abstract: A rotational speed indication signal generator comprises a magnetic circuit and a plurality of generating coils radially arranged with respect to the rotary shaft of a rotor. Each of the generating coils is wound around a radial projection of a circular disk made of a magnetic material so that the axis of the generating coils is normal to the rotary shaft. The generating coils are electrically connected in series in such a manner that a noise voltage induced across one coil caused by external flux has opposite poloraity to that of a noise voltage induced across another coil positioned opposite with respect to the rotary shaft. The electrical connection of the generating coils has a given circular direction while a lead wire connected to the last coil in the series connection has a circular direction opposite to the direction of the series connection.

Abstract: In a compound AC generator having at least one pair of magnetic poles, series field windings wound on the magnetic poles, respectively, and at least one shunt field winding wound on at least one of the pair of magnetic poles in layers with the series field winding wound thereon, the series field winding wound in layers with the shunt field winding is associated with means for blocking the current flow through the series field winding in a direction to increase the magnetic fluxes through the associated magnetic pole thereby to minimize the effects of pulsating field current through the shunt field winding and to stabilize the output of the generator.

Abstract: A stator, for use in an alternating current motor, includes a core having a plurality of angularly spaced slots. A distributed main winding is concentrically arranged in a plurality of the slots, with these slots encompassing a first arcuate region of the core, less than its circumference. End turns for the main winding are positioned adjacent an end face of the first arcuate region of the core. This provides a second arcuate region of at least one end face of the core free of the main winding. In a first embodiment, an auxiliary winding, displaced in phase from the main winding, is received in a plurality of the slots, including at least some slots in the second arcuate region. In the first embodiment, end turns of the auxiliary winding in the second arcuate region are disposed inwardly of the radially outermost edges of the slots in the second arcuate region along at least one end face of the core.