Abstract:
There is provided an electric traction system (1), comprising: a step-down transformer (35) comprising a primary winding (36) for operatively coupling to an AC power supply (40) and a secondary winding (37) which is inductively coupled to the primary winding (36); a traction converter module (2) comprising a first input terminal (4) and a second input terminal (6) which are operatively coupled to the secondary winding (37), and a plurality of AC-to-AC power converters (11), each of which comprises first and second input nodes (3, 5) configured to receive AC power and output nodes (9) configured to supply AC power, wherein the first and second input nodes (3, 5) of the plurality of AC-to-AC power converters (11) are electrically connected in series between the first input terminal (4) and the second input terminal (6); and at least one electric motor (25) configured to be driven by the traction converter module (2).
Abstract:
An exemplary power system may include an electric machine with multiple sets of stator windings, each set of windings being coupled through a separate switch matrix to a common voltage bus, and each of which may be spatially arranged in full pitch around the stator such that stator flux harmonics are substantially reduced. The reduced stator flux harmonics may be associated with phase current harmonic content. In an example application, such power systems may operate in a generating mode to transfer mechanical energy to electrical energy on a DC voltage bus. In some illustrative embodiments, the power system may provide both high-power and high-speed (e.g., 1MW at 8000 rpm or above) motoring and/or generating capability suitable, for example, for on-board (e.g., marine, aviation, traction) power systems.
Abstract:
The toroidal winding has the advantage of being technically easy to manufacture, enabling high slot-fill factors to be obtained and having small end turnings as well as offering the possibility of inverse switching of phase and pole pair numbers. The magnetic return path is also easy to use by means of combined external and internal rotors, (e.g., wheel hub motor). Higher power density is also possible through cooling where cylindrical winding is used, in both asynchronous and synchronous machines. Meaningful power density starts at around 10kW
Abstract:
Die Erfindung betrifft eine magnetisch aktive Einheit (100) einer elektrischen Maschine (140) mit wenigstens zwei Polen (101,102,103,104), mit - einem Blechpaket (154) mit Nuten (1 bis 63), und - wenigstens einer Wicklung (116,118,120) für eine jeweilige der Phasen (L,M,K), wobei die Wicklungen (116,118,120) einen elektrischen Leiter aufweisen, der Spulengruppen (122,124,126,128) in den Nuten (1 bis 63) ausbildet, wodurch Spulen der Spulengruppen (122,124,126,128) ausgebildet sind, - wobei in den Nuten (1 bis 63) wenigstens zwei Abschnitte der elektrischen Leiter von wenigstens einer der Wicklungen (116,118,120) voneinander elektrisch isoliert angeordnet sind, und wenigstens eine erste der Spulengruppen (124) einer der Wicklungen (116,118,120) eine erste Anzahl von Spulen aufweist, die von einer zweiten Anzahl von Spulen einer zweiten der Spulengruppen (126) der gleichen Wicklung (116,118,120) abweicht.
Abstract:
A system for an axial field rotary energy device (31) can include modules (201) that each are an axial field rotary energy device (31). The modules can be connected together for a desired power input or output. Each module can include a housing (203) having an axis (235). The housing can be mechanically coupled to at least one other module. In addition, the housing can be electrically coupled to one other module. Rotors (233) can be rotatably mounted to the housing. Each rotor can include magnets (237). The housing also can have stators (241). Each stator can include a printed circuit board (PCB) (245) having PCB layers (147) comprising coils (149).
Abstract:
An axial field rotary energy device (31) can include a rotor (33) comprising an axis (35) of rotation and a magnet (37). In addition, a stator (141) can be coaxial with the rotor. The stator can include a plurality of stator segments (142) that are coupled together about the axis. Each stator segment can include a printed circuit board (PCB) (145) having a PCB layer (147) comprising a coil (149). Each stator segment also can include only one electrical phase. The stator itself can include one or more electrical phases.
Abstract:
An electromechanical device, comprising: a first member and a second member arranged to move relative to the first member and comprising first and second retardation portions; wherein the first member is arranged to generate a movable magnetic field and wherein the relative speed at which the magnetic field moves relative to the second member is adjustable, wherein at a first relative speed the interaction of the magnetic field with the second member results in the first retardation portion generating an electrical current and a retardation force opposing the movement of the second member being applied to the first retardation portion; and wherein at a second relative speed, different from the first relative speed, the interaction of the magnetic field with the second member results in a) the amount of current generated by the first retardation portion being less than the amount of current generated by the first retardation portion at the first relative speed and b) an amount of retardation force opposing the movement of the second member being applied to the second retardation portion, which is greater than an amount of retardation force applied to the second retardation portion at the first relative speed.
Abstract:
A method for controlling a multi -phase motor includes withholding energization of a first phase of the motor for a non-zero period when the first phase's dwell time begins. Energization of the first phase is activated upon the expiration of the non-zero period. Energization of the first phase is deactivated for the remainder of the dwell time at a deactivation time occurring before or at the expiration of the dwell time.