Abstract: This disclosure includes several different features suitable for use in circumaural and supra-aural headphones designs. Designs that reduce the size of headphones and allow for small form-factor storage configurations are discussed. User convenience features that include synchronizing earpiece stem positions and automatically detecting the orientation of the headphones on a user's head are also discussed. Various power-saving features, design features, sensor configurations and user comfort features are also discussed.

Abstract: An energy system of a building includes a power storage device, and a controller that, during a period of time for which energy costs are lowest, charges a power storage device to a maximum state of charge, and during a period of time for which energy costs are not lowest and an immediate subsequent period of time is predicted to have higher energy costs, charges the power storage device to a target state of charge that is less than the maximum state of charge and that depends on predicted power demand during the subsequent period of time.

Abstract: A permanent magnet formed by additively manufacturing magnetic phases and buffer phases is disclosed. The buffer phase(s) may improve performance, enhance mechanical properties and allow the magnet to better tolerate stresses such that defects such as cracking do not occur or are less likely to occur. The buffer phase may be a magnetic or non-magnetic material.

Abstract: A vehicle, electric machine, and method of manufacturing an electric machine include a stator having teeth extending from a yoke portion toward a rotor and defining slots between adjacent teeth with windings positioned within the slots, wherein the slots are coated with an electrically insulating material having an arcuate surface exiting the slots and extending at least partially over the teeth on at least one end face of the stator to form a winding guide for bending/positioning the windings. The winding guide may be formed by a molded epoxy that replaces insulating paper slot liners while providing a template for forming the hairpin bends of end windings.

Abstract: A three-dimensional magnetic printer includes at least one induction head assembly including an induction heater to heat magnetic material to form an alloy melt and at least one nozzle operable to eject the alloy melt, a coating apparatus, and a base aligned with the at least one nozzle. The induction head assembly deposits at least one alloy melt layer and the coating apparatus forms at least one insulating layer onto the base in accordance with a predetermined pattern to form a three-dimensional article.

Abstract: An electric drive system is actively controlled while an electrified vehicle is being towed. The inverter switches are manipulated to preclude exceeding a maximum voltage of a DC bus and also to preclude exceeding a maximum phase current magnitude. During a transition from an inverter off state to a short-circuit state, field-oriented control is utilized.

Abstract: A controller, responsive to a signal indicating deactivation of a vehicle and disconnection of a traction battery from an inverter, generates a d-axis current command for the inverter having a ramp portion that defines a rate of change in current magnitude that depends on an electric angle between a rotor and stator of an electric machine.

Abstract: An electric machine includes a rotor and a stator. The rotor is configured to generate rotational motion. The stator is disposed radially about the rotor. The stator has a core and windings. The core defines a first array of orifices about an inner diameter of the core and a second array of orifices radially outward from the first array of orifices. The windings are disposed within the first array of orifices. A magnetic material is configured to advance into and retract from the second array of orifices to adjust a magnetic flux within an airgap defined between the rotor and the stator.

Abstract: Systems and methods for commanding an electric drive system for an electric or hybrid vehicle are described. In one example, the drive system is commanded by a controller that supplies a pulsed torque command that varies in magnitude as a function of time when a driver of a vehicle requests a constant driver demand torque.

Abstract: An electric machine includes a stack of interlocked rotor core laminations, individual rotor core laminations of the interlocked rotor core laminations including a mortise extending therein and an integrally-formed tenon extending therefrom, wherein the tenons interface with the mortises to interlock adjacent rotor core laminations.

Abstract: A method of processing an anisotropic permanent magnet includes forming anisotropic flakes from a bulk magnet alloy, each of the anisotropic flakes having an easy magnetization direction with respect to a surface of the flake and combining the anisotropic flakes with a binder to form a mixture. The method further includes extruding or rolling the mixture without applying a magnetic field such that the easy magnetization directions of the anisotropic flakes align to form one or more layers having a magnetization direction aligned with the easy magnetization directions of the anisotropic flakes, and producing the anisotropic permanent magnet from the layers having the magnetization direction such that the anisotropic permanent magnet has a magnetization with a specific orientation.

Abstract: A permanent magnet formed by additively manufacturing magnetic phases and buffer phases is disclosed. The buffer phase(s) may improve performance, enhance mechanical properties and allow the magnet to better tolerate stresses such that defects such as cracking do not occur or are less likely to occur. The buffer phase may be a magnetic or non-magnetic material.

Abstract: Systems and methods for commanding an electric drive system for an electric or hybrid vehicle are described. In one example, the drive system is commanded by a controller that supplies a pulsed torque command that varies in frequency as a function of electric machine speed when a driver of a vehicle requests a constant driver demand torque.

Abstract: An automotive power system includes a traction battery, an electric machine, and one or more power cards each containing at least one power semiconductor switch and at least one Y-snubber that includes a series connected capacitor and resistor. The power semiconductor switches are arranged to form an inverter electrically connected between the traction battery and electric machine. The resistors are tuned to dissipate common mode noise associated with operation of the power semiconductor switches.

Abstract: A signal is received from a sensor or other controller of the vehicle. A bucket state is incremented responsive to the signal exceeding a signal threshold. An event is generated responsive to the bucket state exceeding a bucket threshold value. The event is sent, in an event message, to a cloud server.

Abstract: An energy system of a building includes a power storage device, and a controller that, during a period of time for which energy costs are lowest, charges a power storage device to a maximum state of charge, and during a period of time for which energy costs are not lowest and an immediate subsequent period of time is predicted to have higher energy costs, charges the power storage device to a target state of charge that is less than the maximum state of charge and that depends on predicted power demand during the subsequent period of time.

Abstract: A method includes responsive to indication that a predicted electricity price will exceed a predefined threshold during a timeframe, charging one or more power storage devices to a target amount, that is based on a predicted power demand of the building during the timeframe, before the timeframe begins, and discharging the one or more power storage devices to supply power to the building during the timeframe.

Abstract: A power module, such as a power module of a traction powertrain of an electrified vehicle, includes a power module cell arranged in a stack that defines a coolant supply manifold and a coolant return manifold. The power module cell includes a power stage having a substrate. The substrate includes first microchannels configured to input coolant from the supply manifold and impeded from outputting coolant to the return manifold, second microchannels configured to output coolant to the return manifold and impeded from inputting coolant from the supply manifold, and third microchannels crisscrossing and connecting the first and second microchannels in fluid communication.

Abstract: A vehicle power module assembly including first and second power modules is provided. The first power module may include a first lock feature extending from a lower portion of a first minor side at a first central axis. The second power module may include a second lock feature at an upper portion of a second minor side at a second central axis. The lock features may be sized for interlock with one another to secure the power modules to one another. The first lock feature may be a loop element defining a through-hole and the second lock feature may be a wedge. The through-hole may be sized for the wedge to extend therein and to interlock the first power module and the second power module to one another. The first lock feature may be a flexible hook element and the second lock feature may be a slot.

Abstract: A controller, while parameters are indicative of electromagnetic interference exceeding a predetermined value, generates voltage reference vectors or duty cycle commands such that differences between switching times of any two phases of an inverter are always greater than a threshold, and while the parameters are indicative of the electromagnetic interference being less than the predetermined value, generates the voltage reference vectors or duty cycle commands such that the differences are sometimes greater than the threshold and other times less than the threshold.