The Boeing Company

Christopher Pete Benson

Douglas Conrad Cameron, Jr

Peng Zeng

Leonard Jon Quadracci

Leonard J Quadracci

Zeng Peng

A method and apparatus for controlling an electric aircraft. An apparatus comprises a motor, a power source, and a four-quadrant controller. The motor operates in four quadrants of operational space and operates in one of an accelerating state and a regenerative braking state. A total current flows through the motor. The power source is connected to the motor, and when the motor operates in the regenerative braking state, the total current flows through the power source. The power source has a maximum allowable current. The four-quadrant controller is programmed to identify a recharging parameter, brake the motor to initiate the regenerative braking state when the recharging parameter is present, recharge the power source with the total current during the regenerative braking state, and control a duty cycle of the motor such that the total current does not exceed the maximum allowable current during the regenerative braking state.

Aircraft with electric motor and rechargeable power source

A method and apparatus for controlling a motor. The motor comprises windings. A switch bridge comprising a plurality of switches is configured to couple a power source to the windings. A motor controller is configured to control the plurality of switches. An undesired condition identifier is configured to identify an undesired condition when the motor is providing power to the power source, wherein the undesired condition is defined with respect to a characteristic of the power source. An undesired condition reducer is configured to reduce the undesired condition in response to identifying the undesired condition by the undesired condition identifier.

Motor control for stability and power supply protection

A method and apparatus for controlling a group of electric motors. A controller is configured to identify a group of switching frequencies for a desired signature for the group of electric motors. The controller is further configured to control switching of a current supplied to the group of electric motors with the group of switching frequencies for the desired signature identified.

Electric motor signature reduction system

A method and apparatus for controlling an electric motor. A switching frequency meeting a desired operating condition is identified from information relating to operation of the electric motor. A switching of a current supplied to the electric motor with the switching frequency identified is controlled.

Electric motor frequency modulation system

A method for controlling an electric motor. A desired speed is identified for the electric motor during operation of the electric motor. A voltage is identified to cause the electric motor to turn at the desired speed. The voltage is applied to the electric motor and actively controlled during operation of the electric motor.

Active voltage controller for an electric motor

A method includes controlling a plurality of rotors to cause a plurality of antennas to traverse a flight path. Traversing the flight path includes concurrent translation of a body in a horizontal plane and rotation of the body about an axis. The plurality of rotors is coupled to the body. The method also includes, while traversing the flight path, receiving a first phase measurement of a first signal via a first antenna of a plurality of antennas and receiving a second phase measurement of the first signal via a second antenna of the plurality of antennas. The method further includes determining position information related to a location of the transmitter based at least in part on the first phase measurement and the second phase measurement.

Systems and methods of transmitter location detection

A method and apparatus for controlling operation of an electric motor. A controller is configured to identify a position of a disc relative to a plate with coils physically associated with the plate. The controller is further configured to control a current sent to the coils based on the position of a disc. The disc is configured to move such that a closest point between the disc and the plate changes along a periphery of the disc.

Reluctance motor system

A method and apparatus for controlling an electric motor. A controller is configured to identify a start time for a signal based on a back electromotive force present in an electric motor during operation of the electric motor. The start time is for a position of a rotor relative to a group of coils. The controller is further configured to send the signal to the group of coils using the start time identified. An effect of the back electromotive force on the signal is reduced.

Growing community of inventors

Berkeley, CA, United States of America

Christopher Pete Benson