Abstract: A motor system comprises a device having a plurality of conductors coupled to a plurality of isolated connection bars, wherein the plurality of conductors is divided symmetrically into a plurality of conductor groups, and all conductors in a conductor group are connected to a connection bar, a first power converter group connected between a first power source and a first conductor group, a second power converter group connected between a second power source and a second conductor group, wherein the first group of conductors and the second group of conductors are configured such that a charge balance between the first power source and a second power source is achieved and a rotor magnetically coupled to a stator.

Abstract: A device has a plurality of coils arranged along a perimeter within the device, where each coil has a winding configured to be coupled to a power converter through a resonant capacitor, and forms a resonator with the resonant capacitor. The device has also a connection core which is magnetically coupled to the plurality of coils. Furthermore, the device has a plurality of power converters, where each power converter is coupled to one of the plurality of coils, and is configured such that a current flowing through the winding of the coil has the same frequency as other winding currents in the device, and the phase angle of the current is approximately equal to the space angle of the coil, so a rotating magnetic field is formed in a space around the device.

Abstract: A system comprises a stator magnetically coupled to a rotor and a plurality of conductor assemblies distributed evenly along a perimeter of the device, wherein each conductor assembly is evenly distributed into at least two branches of conductors, and wherein each branch comprising a plurality of conductors, all the branches form a plurality of windings, wherein a winding comprises a positive segment and a negative segment, and wherein each segment has a plurality of branches, and wherein one segment is in more than two conductor assemblies and the plurality of windings is symmetrically divided into a plurality of groups, wherein each group of windings forms a balanced multi-phase system and is connected to a connection bar, and wherein at least two connection bars are isolated from each other.

Abstract: A structure includes a first metal trace formed by a plurality of first metal tracks, each of the plurality of first metal tracks comprises an upper portion formed in a first upper layer, a lower portion formed in a first lower layer and a plurality of first interconnects formed between the first upper layer and the first lower layer, wherein the plurality of first metal tracks forms a first magnetic flux path having a first toroidal shape.

Abstract: A structure comprises a first portion of a winding having a first almost enclosed shape, a second portion of the winding having a second almost enclosed shape and a connection element between the first portion and the second portion, wherein the first portion and the second portion are arranged in a symmetrical manner and the first portion, the second portion and the connection element form a first air core inductor.

Abstract: A method includes magnetically coupling a first coil of a wireless power transfer system to a second coil of the wireless power transfer system, wherein the first coil is coupled to a first resonant tank comprising a first variable capacitance network, and the second coil is coupled a second resonant tank comprising a second variable capacitance network, and adjusting a capacitance of at least one of the first variable capacitance network and the second variable capacitance network to regulate an output voltage of the wireless power transfer system.

Abstract: A system includes an input port having an input voltage, an output port having an output voltage, and a power converter having a switch network with a plurality of power switches and a first resonant tank having a first resonant capacitor and a first resonant inductor, where at least one resonant component within the first resonant capacitor and the first resonant inductor is a switchable component configured to switch between different values. The system further includes a resonant mode selection block configured to adjust a value of the switchable component to maintain a performance of the system, and a controller configured to adjust a switching frequency or a duty cycle of the power converter.

Abstract: A method includes coupling a primary side circuit of a resonant power system to a secondary side circuit, wherein the primary side circuit comprises a first resonant tank comprising a first variable capacitance network having a first resonant frequency and the secondary side circuit comprises a second resonant tank having a second resonant frequency and modulating a capacitance of the first variable capacitance network to adjust an operation parameter of the resonant power system.

Abstract: A system includes a first device, a second device, and a power control block. The first device has a first power converter and a first resonator which has a first resonant capacitor and a first coil. The second device has a second power converter and a second resonator which has a second resonant capacitor and a second coil. The second power converter is coupled to a ratio-controllable power converter, and the first coil and the second coil are magnetically coupled. The power control block is configured to adjust the system frequency, the second power converter output voltage and the current in the first coil in coordination.

Abstract: A system includes a motor having a plurality of windings, a rotor and a stator magnetically coupled to the rotor, a plurality of power inverters connected to respective windings, wherein the plurality of power inverters is configured to control currents of the plurality of windings, and a controller configured to determine an injection ratio of a high-order harmonic component to a fundamental component based on a performance index, and wherein the injection ratio for a magnetizing component is different from the injection ratio for a torque component at a same harmonic frequency.

Abstract: An apparatus comprises a first capacitor and a second capacitor connected in series, a diode and the second capacitor connected in parallel, wherein a cathode of the diode is connected to a common node of the first capacitor and the second capacitor and a plurality of adjustable capacitance networks connected in parallel with the second capacitor.

Abstract: A system includes a vehicle having an engine, a first motor mechanically coupled to a shaft of the engine, a second motor configured to provide torque to the vehicle or the engine in combination with the first motor, and a first controller coupled to at least one of the first motor and the second motor, wherein the first controller is configured such that the first motor and the second motor provide a mechanical torque to rotate the shaft of the engine before the engine is running.

Abstract: A system includes a switch network coupled to a power source, wherein the switch network comprises a plurality of power switches, a transmitter resonant tank coupled to the plurality of power switches, wherein the transmitter resonant tank comprises a first variable capacitance network, a transmitter coil coupled to the transmitter resonant tank, and a first receiver comprising a first receiver coil configured to be magnetically coupled to the transmitter coil, and a first receiver resonant tank coupled to the first receiver coil, wherein the first receiver resonant tank comprises a second variable capacitance network.

Abstract: A method includes adjusting currents of a plurality of windings of a motor through a plurality of power converters coupled to the plurality of windings so that the number of poles and the number of phases of the motor are dynamically adjustable, and injecting a plurality of high-order harmonic currents into the plurality of windings of the motor through controlling the plurality of power converters to improve a performance index of the motor.

Abstract: A system comprises a power amplifier configured to receive a frequency control signal, wherein the frequency control signal is generated based upon a system clock of a communication device and the frequency control signal is used to control a switching frequency of the power amplifier and a first resonant circuit coupled between the power amplifier and a first coil, wherein the first resonant circuit comprises a first variable capacitance network.

Abstract: A device has a plurality of power converter groups and a control system. A power converter group has a group of power converters and is coupled between an input voltage source and a group of windings of a motor generator. The control system is configured to control currents of the windings such that the number of poles of and the number of phases in a pair of poles of the motor/generator are dynamically adjusted, and the number of poles and the strength of a magnetic field of the motor generator are controlled to reduce a power loss. The motor/generator has an air gap and a stator with a plurality of slots, where the windings are installed in. The windings are configured such that the number of poles and the number of phases in a pair of poles of the motor/generator can be dynamically adjusted.

Abstract: A system comprises a soft-start circuit connected between an input dc source and a switch network comprising a plurality of power switches, a primary resonant tank coupled to the plurality of power switches, wherein the primary resonant tank comprises at least a resonant capacitor and a transmitter coil coupled to the primary resonant tank, wherein the transmitter coil is configured to be magnetically coupled to a receiver coil.

Abstract: A motor control method comprises detecting operating parameters of a motor system comprising a plurality of windings, a rotor, a stator magnetically coupled to the rotor and a plurality of power converters connected to the plurality of windings, determining, by a controller, a suitable pole number and a preliminary set of operating variables based upon the operating parameters, reducing operating stresses of the motor system gradually and after reducing the operating stresses, configuring the plurality of power converters so as to adjust the number of poles of the motor system according to the suitable pole number.

Abstract: A power regulator includes an input capacitor connected between a first voltage bus and an intermediate point, an output capacitor connected between a second voltage bus and the intermediate point, a plurality of switches and an inductor connected between the input capacitor and the output capacitor, wherein a source of one switch of the plurality of switches is connected to the intermediate point and a protection device connected between the intermediate point and a third voltage bus.

Abstract: A system includes a first power transfer coil configured to be magnetically coupled to a second power transfer coil and an auxiliary coil adjacent to the first power transfer coil, wherein at least one of the first power transfer coil and the auxiliary coil comprises a first turn and a second turn circular in shape, and wherein the first turn and the second turn have a similar center position and a current flowing through the first turn and a current flowing through the second turn are in opposite directions.