Patents Assigned to Tula eTechnology, Inc.
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Patent number: 12278581Abstract: An electric machine is provided. A power converter is coupled between a power supply and a wound field synchronous machine. The power converter is arranged to provide a pulsed operation by providing a pulsed DC current to field windings of the wound field synchronous machine.Type: GrantFiled: March 15, 2023Date of Patent: April 15, 2025Assignee: Tula eTechnology, Inc.Inventors: Philippe Farah, Paul Carvell
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Patent number: 12244250Abstract: A control system for an electric machine, wherein the electric machine has a maximum bus value (Vbus) is provided. The control system is configured to determine a feedforward vector (VFF), determine a feedback vector (VFB), compare a magnitude of a sum of the feedforward vector and feedback vector (|VFF+VFB|) and the maximum bus value (Vbus), when |VFF+VFB|?Vbus providing a control vector of VFF+VFB to the electric machine, and when |VFF+VFB|>Vbus providing a control vector of VFF+k(VFB) to the electric machine, where k is a scalar value between 0 and 1 inclusive where |VFF+k(VFB)|=Vbus.Type: GrantFiled: April 25, 2023Date of Patent: March 4, 2025Assignee: Tula eTechnology, Inc.Inventor: Andrew W. Phillips
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Patent number: 12206346Abstract: An electric machine is provided. A polyphase machine is provided. A power inverter is electrically connected to the polyphase machine. A controller is electrically connected to the power inverter, wherein the controller provides switching signals to the power inverter, wherein the controller comprises a trajectory calculator that provides an optimized trajectory for transitioning the polyphase machine from a first torque to a second torque.Type: GrantFiled: May 16, 2023Date of Patent: January 21, 2025Assignee: Tula eTechnology, Inc.Inventors: Paul Carvell, Amnish Singh, Tate Allen Cooper
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Patent number: 12199532Abstract: A method of controlling an electric motor includes pulsing the electric motor and phase shifting the modulation frequency. Pulsing the electric motor at the modulation frequency propels a vehicle to increase efficiency of the electric motor. Phase shifting the modulation frequency includes phase shifting between 0 degrees and 180 degrees to reduce vibrations induced in the vehicle.Type: GrantFiled: January 13, 2023Date of Patent: January 14, 2025Assignee: Tula eTechnology, Inc.Inventor: Anastasios Arvanitis
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Patent number: 12145452Abstract: A method of controlling an electric motor to optimize system efficiency of an electric motor operable in a pulsed mode and a continuous mode is disclosed herein. The method includes receiving a requested torque for the electric motor, calculating a pulsed system efficiency, calculating a continuous system efficiency, and operating the electric motor in the pulsed mode when the pulsed system efficiency is greater than the continuous system efficiency. The pulsed system efficiency is calculated for delivering the requested torque from the electric motor in a plurality of torque pulses greater than the requested torque. The continuous system efficiency is calculated for delivering the requested torque from the electric motor as a continuous torque. The system efficiency may be at least partially based on a battery efficiency and a motor efficiency.Type: GrantFiled: May 2, 2023Date of Patent: November 19, 2024Assignee: Tula eTechnology, Inc.Inventor: Xiaoping Cai
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Publication number: 20240195342Abstract: A method of controlling an electric machine having a separately excitable rotor and stator includes pulsing the electric machine and controlling the electric machine to an OFF state. Pulsing the electric machine includes exiting the rotor with direction current and the stator with a stator biasing current at the same time to generate magnetic flux in the rotor via two separate paths. Pulsing the electric machine may also include terminating the stator basing current when a desired magnetic flux is generated in the rotor. Pulsing the electric machine may include proving a stator flux to the stator such that the electric machine provides a pulse torque.Type: ApplicationFiled: December 18, 2023Publication date: June 13, 2024Applicant: Tula eTechnology, Inc.Inventors: Paul Carvell, Philippe Farah
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Patent number: 12003202Abstract: A variety of methods, controllers and electric machine systems are described that facilitate pulsed control of electric machines (e.g., electric motors and generators) to improve the machine's energy conversion efficiency. Under selected operating conditions, the electric machine is intermittently driven (pulsed). The pulsed operation causes the output of the electric machine to alternate between a first output level and a second output level that is lower than the first output level. The output levels are selected such that at least one of the electric machine and a system that includes the electric machine has a higher energy conversion efficiency during the pulsed operation than the electric machine would have when operated at a third output level that would be required to drive the electric machine in a continuous manner to deliver the desired output. In some embodiments, the second output level is zero torque.Type: GrantFiled: March 8, 2023Date of Patent: June 4, 2024Assignee: Tula eTechnology, Inc.Inventor: Adya S. Tripathi
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Patent number: 11973447Abstract: Methods, controllers and electric machine systems are described for selective phase control of electric machines (e.g. electric motors and generators).Type: GrantFiled: June 14, 2022Date of Patent: April 30, 2024Assignee: Tula eTechnology, Inc.Inventor: Zhiqian Chen
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Publication number: 20240120860Abstract: A method of controlling an electric machine having a separately excitable rotor and stator includes exciting the rotor and the stator at the same time to generate an optimal magnetic flux in the electric machine. The method includes maintaining the optimal magnetic flux by reducing a stator current as a rotor current rises. The method also includes providing a torque current to the stator as the rotor current rises such that the electric machine produces a demanded torque while the rotor current rises.Type: ApplicationFiled: September 28, 2023Publication date: April 11, 2024Applicant: Tula eTechnology, Inc.Inventors: Paul Carvell, Md. Zakirul Islam
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Publication number: 20240063740Abstract: A method of predicting torque modulation parameters of an electric machine based on operating conditions of the electric machine includes generating a data set for torque modulation parameters of an electric machine for the different operating conditions of the electric machine. The method also includes relating the torque modulation parameters to the operating conditions of the electric machine with a model and loading the model into a controller of the electric machine. The method also includes predicting the torque modulation parameters of the electric machine for the operating conditions of the electric machine using the model in real-time. The method may include adjusting the torque modulation parameters of the electric machine based on the predicted torque modulation parameters.Type: ApplicationFiled: July 7, 2023Publication date: February 22, 2024Applicant: Tula eTechnology, Inc.Inventors: Paul Carvell, Siyu Leng, Zakirul Islam
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Patent number: 11888424Abstract: A method of controlling an electric machine having a separately excitable rotor and stator includes pulsing the electric machine and controlling the electric machine to an OFF state. Pulsing the electric machine includes exiting the rotor with direction current and the stator with a stator biasing current at the same time to generate magnetic flux in the rotor via two separate paths. Pulsing the electric machine may also include terminating the stator basing current when a desired magnetic flux is generated in the rotor. Pulsing the electric machine may include proving a stator flux to the stator such that the electric machine provides a pulse torque.Type: GrantFiled: May 22, 2023Date of Patent: January 30, 2024Assignee: Tula eTechnology, Inc.Inventors: Paul Carvell, Philippe Farah
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Publication number: 20240022197Abstract: A method of controlling an electric machine having a separately excitable rotor and stator includes pulsing the electric machine and controlling the electric machine to an OFF state. Pulsing the electric machine includes exiting the rotor with direction current and the stator with a stator biasing current at the same time to generate magnetic flux in the rotor via two separate paths. Pulsing the electric machine may also include terminating the stator basing current when a desired magnetic flux is generated in the rotor. Pulsing the electric machine may include proving a stator flux to the stator such that the electric machine provides a pulse torque.Type: ApplicationFiled: May 22, 2023Publication date: January 18, 2024Applicant: Tula eTechnology, Inc.Inventors: Paul Carvell, Philippe Farah
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Patent number: 11863096Abstract: A boost circuit is arranged to reduce rise and fall times of pulsed power used for pulsed control operation of electric machines. Magnetic energy present in the electric machine at the end of a pulse is extracted by the boost circuit to reduce the pulse fall time. The energy is stored by the boost circuit and then applied at the beginning of a subsequent pulse to reduce the rise time. By reducing rise and fall times compared to not using such a boost circuit, machine efficiency is improved.Type: GrantFiled: February 3, 2021Date of Patent: January 2, 2024Assignee: Tula eTechnology, Inc.Inventors: Babak Mazda, Adya S. Tripathi, Paul Carvell
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Publication number: 20230268852Abstract: A method of controlling an electric motor includes receiving a duty cycle for the electric motor for delivering a target torque from the electric motor, generating a pulse train, and pulsing the electric motor with the generated pulse train. Generating the pulse train being at least partially based on the received duty cycle. The generated pulse train optimized to improve at least one of noise, vibration, or harshness of the electric motor when compared to a constant pulse frequency.Type: ApplicationFiled: April 24, 2023Publication date: August 24, 2023Applicant: Tula eTechnology, Inc.Inventors: Andrew W. Phillips, Matthew A. Younkins, Paul Carvell, John M. Fuerst
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Publication number: 20230264576Abstract: A method of controlling an electric motor to optimize system efficiency of an electric motor operable in a pulsed mode and a continuous mode is disclosed herein. The method includes receiving a requested torque for the electric motor, calculating a pulsed system efficiency, calculating a continuous system efficiency, and operating the electric motor in the pulsed mode when the pulsed system efficiency is greater than the continuous system efficiency. The pulsed system efficiency is calculated for delivering the requested torque from the electric motor in a plurality of torque pulses greater than the requested torque. The continuous system efficiency is calculated for delivering the requested torque from the electric motor as a continuous torque. The system efficiency may be at least partially based on a battery efficiency and a motor efficiency.Type: ApplicationFiled: May 2, 2023Publication date: August 24, 2023Applicant: Tula eTechnology, Inc.Inventor: Xiaoping Cai
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Patent number: 11695361Abstract: An electric machine is provided. A polyphase machine is provided. A power inverter is electrically connected to the polyphase machine. A controller is electrically connected to the power inverter, wherein the controller provides switching signals to the power inverter, wherein the controller comprises a trajectory calculator that provides an optimized trajectory for transitioning the polyphase machine from a first torque to a second torque.Type: GrantFiled: June 13, 2022Date of Patent: July 4, 2023Assignee: Tula eTechnology, Inc.Inventors: Paul Carvell, Amnish Singh, Tate Allen Cooper
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Publication number: 20230208330Abstract: A method of controlling an electric motor includes pulsing the electric motor and phase shifting the modulation frequency. Pulsing the electric motor at the modulation frequency propels a vehicle to increase efficiency of the electric motor. Phase shifting the modulation frequency includes phase shifting between 0 degrees and 180 degrees to reduce vibrations induced in the vehicle.Type: ApplicationFiled: January 13, 2023Publication date: June 29, 2023Applicant: Tula eTechnology, Inc.Inventor: Anastasios Arvanitis
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Patent number: 11673476Abstract: A method of controlling an electric motor to optimize system efficiency of an electric motor operable in a pulsed mode and a continuous mode is disclosed herein. The method includes receiving a requested torque for the electric motor, calculating a pulsed system efficiency, calculating a continuous system efficiency, and operating the electric motor in the pulsed mode when the pulsed system efficiency is greater than the continuous system efficiency. The pulsed system efficiency is calculated for delivering the requested torque from the electric motor in a plurality of torque pulses greater than the requested torque. The continuous system efficiency is calculated for delivering the requested torque from the electric motor as a continuous torque. The system efficiency may be at least partially based on a battery efficiency and a motor efficiency.Type: GrantFiled: April 29, 2022Date of Patent: June 13, 2023Assignee: Tula eTechnology, Inc.Inventor: Xiaoping Cai
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Patent number: 11637466Abstract: Methods, systems, and mechanical and electromechanical arrangements for field-weakening of an electric machine that utilizes permanent magnets are disclosed herein. One rotor assembly for an electric motor includes a rotor body that moves with respect to a central axis, the rotor body having a core and a number of permanent magnets that move with the rotor body, and the rotor body also having a number of movable field-weakening magnetic materials that move with respect to the permanent magnets and to the central axis.Type: GrantFiled: March 24, 2022Date of Patent: April 25, 2023Assignee: Tula eTechnology Inc.Inventor: Md. Zakirul Islam
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Patent number: 11628730Abstract: Pulsed control of electric motors, and more particularly, to selectively adjusting one or more of a pulsing frequency, an amplitude of the pulses and/or a duty cycle of the pulses for reducing Noise, Vibration and Harshness (NVH) while maintaining high levels of operating efficiency.Type: GrantFiled: January 26, 2021Date of Patent: April 18, 2023Assignee: Tula eTechnology, Inc.Inventor: Vijay Srinivasan