Example brush holder assemblies of an electric machine are disclosed. An example brush holder assembly of an electric machine includes a carbon brush including an upper surface and a lower surface opposite the upper surface. The brush holder assembly also includes one or more lead wires extending out of the carbon brush at an insertion point on the upper surface and a first cavity extending into the carbon brush from the upper surface at a location spaced away from the insertion point of the one or more lead wires and unobstructed by the one or more lead wires.

An) electric machine with variable torque generation having a tunable Halbach array configuration. The electric machine includes a magnet assembly for generating a magnetic field. The magnet assembly includes a plurality of fixed magnets disposed in a ring arrangement so that fixed magnets having a north pole faced toward the rotor or stator are alternated with fixed magnets having a south pole faced toward the rotor or stator, a plurality of rotatable magnets disposed within a respective slot formed between two adjacent fixed magnets, a drive assembly for turning the rotatable magnets within the slots to vary the magnetic field generated by the magnet assembly in the rotor or stator, the drive assembly configured to turn the rotatable magnets between a first position wherein the magnetic field in the rotor or stator is augmented and a second position wherein the magnetic field in the rotor or stator is cancelled.

A method for dynamically monitoring temperature of a fluid at a heat generating device includes monitoring, using a temperature sensor, temperature of the fluid held in a fluidic sump. A first fluidic flow rate and a second fluidic flow rate are determined. A third fluidic flow rate and a temperature drop of the fluid across the heat exchanger in the active coolant circuit are determined based upon the temperature of the fluid and the third fluidic flow rate through the active coolant circuit. A fluid temperature supplied to the electric machine through the active coolant circuit is determined based upon the third fluidic flow rate and the temperature drop of the fluid across the heat exchanger. An effective temperature of the fluid is determined based upon the temperature of the fluid in the sump and the temperature of the fluid supplied to the electric machine through the active coolant circuit.

A cooling system, comprising: a heat exchange module, wherein the heat exchange module at least comprises a first channel and a second channel that are independent from each other; a first cooling circuit, wherein the first cooling circuit is connected to the first channel of the heat exchange module; and a second cooling circuit, wherein the second cooling circuit is connected to the first channel of the heat exchange module, and a first coolant in the first cooling circuit and/or a second coolant in the second cooling circuit can flow through the first channel of the heat exchange module so as to be used for performing heat exchange with a third coolant that flows through the second channel of the heat exchange module. According to the cooling system, the reliability of the cooling system can be improved by means of the design of dual cooling circuits.

A cooling system, comprising: a heat exchange module, wherein the heat exchange module at least comprises a first channel and a second channel that are independent from each other; a first cooling circuit, wherein the first cooling circuit is connected to the first channel of the heat exchange module; and a second cooling circuit, wherein the second cooling circuit is connected to the first channel of the heat exchange module, and a first coolant in the first cooling circuit and/or a second coolant in the second cooling circuit can flow through the first channel of the heat exchange module so as to be used for performing heat exchange with a third coolant that flows through the second channel of the heat exchange module. According to the cooling system, the reliability of the cooling system can be improved by means of the design of dual cooling circuits.

Generators, systems, and methods can comprise a resistance temperature detector (RTD) module; a controller area network (CAN) module; and an optical interface between the RTD module and the CAN module. The optical interface can be directly connected to each of the RTD module and the CAN module. The RTD module can be configured to convert first optical signals from the optical interface to first RTD signals and to convert second RTD signals to second optical signals for transmission through the optical interface to the CAN module. The CAN module can be configured to convert the second optical signals from the optical interface to first CAN signals and to convert second CAN signals to the first optical signals for transmission through the optical interface to the resistance temperature detector (RTD) module.

Generators, systems, and methods can comprise a resistance temperature detector (RTD) module; a controller area network (CAN) module; and an optical interface between the RTD module and the CAN module. The optical interface can be directly connected to each of the RTD module and the CAN module. The RTD module can be configured to convert first optical signals from the optical interface to first RTD signals and to convert second RTD signals to second optical signals for transmission through the optical interface to the CAN module. The CAN module can be configured to convert the second optical signals from the optical interface to first CAN signals and to convert second CAN signals to the first optical signals for transmission through the optical interface to the resistance temperature detector (RTD) module.

An apparatus for treating a respiratory disorder in a patient includes a power supply, a first power supply circuit coupled to the power supply, a pressure generator to generate a flow of air, a transducer to generate a flow signal representing a property of the flow of air, and motor power supply circuitry. The motor power supply circuitry includes: a motor controller to control operation of a motor in the pressure generator based on the flow signal; one or more storage elements to store energy generated by motor deceleration; an energy dissipation circuit to dissipate a portion the energy generated by the deceleration of the motor; and an energy transfer circuit to couple the one or more storage elements to the first power supply circuit and transfer the energy generated by motor deceleration and/or the energy stored by the one or more storage elements to the first power supply circuit.

An electromagnetic machine for generating force is provided. The electromagnetic machine includes a magnet having opposing sides extending along a longitudinal axis. The electromagnetic machine includes a pair of ferromagnetic bodies respectively extending along the opposing sides of the magnet, and along the longitudinal axis, each of the ferromagnetic bodies comprising: a back-iron portion; and a pole portion extending from the back-iron portion. The magnet and the ferromagnetic bodies include reciprocal retention devices at the opposing sides along the longitudinal axis. The electromagnetic machine includes electrical windings around respective pole portions of the ferromagnetic bodies, the electrical windings around the respective pole portions being independently controllable. The electromagnetic machine includes at least one cold plate configured to thermally isolate the magnet from the electrical windings.

A system and methods are provided for a telemetry system for monitoring magnet temperatures within an operating electric motor. The telemetry system includes one or more sensors that are coupled with magnets comprising a rotor of the electric motor. A telemetry controller is mounted near a motor shaft comprising the rotor and wired to the sensors. The telemetry controller receives measured data signals from the sensors and transmits temperature-related information during operation of the electric motor. The telemetry controller is powered by way of an electric current induced in a winding coupled with a portion of the rotor that exposes the winding to a varying magnetic flux. The winding may comprise two or more smaller windings disposed at different locations of the rotor. A telemetry receiver is disposed in a stationary configuration nearby the electric motor such that wirelessly transmitted temperature-related information is received from the telemetry controller during operation of the electric motor.