Variable-flux memory motor and methods of controlling a variable-flux motor
AssigneeJacobi Motors, LLC
InventorsNicolaus Radford, Mohammadreza Barzegaranbaboli, Akhila Bachapalli, Takashi Nakachi, Chaitanya Ravipalli, Brian Wightman, Shriya Bhatnagar
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Abstract
In one aspect, embodiments of the invention are directed to a multi-pole rotor of a variable-flux memory motor (VFMM) that includes: a rotor core; and a plurality of poles. Each of the poles includes: one or more soft rotor magnets; a first ferrous wedge; and a second ferrous wedge. The one or more soft rotor magnets are disposed between the first and second ferrous wedges in a circumferential direction of the rotor.
Claims24
A multi-pole rotor of a variable-flux memory motor (VFMM), the rotor comprising:
- a rotor core;
- and
- a plurality of poles, wherein each of the poles comprises:
- one or more soft rotor magnets;
- a first ferrous wedge;
- and
- a second ferrous wedge, wherein
- the one or more soft rotor magnets are disposed between the first and second ferrous wedges in a circumferential direction of the rotor, and
- the one or more soft rotor magnets comprise a combination of aluminum, nickel, and cobalt.
A multi-pole rotor of a variable-flux memory motor (VFMM), the rotor comprising:
- a rotor core;
- and
- a plurality of poles, wherein each of the poles comprises:
- one or more soft rotor magnets;
- a first ferrous wedge;
- and
- a second ferrous wedge, wherein
- the one or more soft rotor magnets are disposed between the first and second ferrous wedges in a circumferential direction of the rotor, and
- an absolute value of a slope of a magnetization direction in the one or more soft rotor magnets is equal to or more than 4.
A method of controlling a magnetization state of a variable-flux memory motor (VFMM) having a rotor, the method comprising:
- receiving a command to change the magnetization state;
- determining an ideal magnetization state based on the command;
- measuring a back electromotive force generated by magnets of the rotor;
- determining a real-time magnetization state of the magnets based on the measured back electromotive force;
- determining a d-axis current pulse based on a difference between the ideal magnetization state and the real-time magnetization state;
- and
- sending the d-axis current pulse to stator windings of the VFMM to adjust the real-time magnetization state to an adjusted real-time magnetization state such that an absolute value of the difference between the ideal magnetization state and the adjusted real-time magnetization state falls within a predetermined threshold.
A method of automatically controlling a magnetization state of a variable-flux memory motor (VFMM) having a rotor, the method comprising:
- measuring a speed of the VFMM;
- determine a torque of the VFMM;
- determining an ideal magnetization state based on the speed and the torque of the VFMM;
- measuring a back electromotive force generated by magnets of the rotor;
- determining a real-time magnetization state of the magnets based on the measured back electromotive force;
- determining a d-axis current pulse based on a difference between the ideal magnetization state and the real-time magnetization state;
- and
- sending the d-axis current pulse to stator windings of the VFMM to adjust the real-time magnetization state to an adjusted real-time magnetization state such that an absolute value of the difference between the ideal magnetization state and the adjusted real-time magnetization state falls within a predetermined threshold.
A system for variable-flux memory motor (VFMM) comprising:
- a VFMM comprising:
- a rotor comprising a rotor core and a plurality of poles, wherein each pole comprises:
- one or more soft rotor magnets;
- a first ferrous wedge;
- and
- a second ferrous wedge, wherein
- the one or more soft rotor magnets are disposed between the first and second ferrous wedges, and
- a stator comprising:
- first, second, and third stator windings corresponding to first, second, and third magnetization phases, respectively;
- and
- at least one sense coil,
- wherein the sense coil measures a magnetization state of the VFMM, and
- a controller that controls the magnetization state of the VFMM based on the magnetization state of the VFMM measured via the sense coil, and
- wherein the controller adjusts the magnetization state of the VFMM via a current pulse in at least one of the first, second, and third stator windings.
Dependencies are inferred from the claim text.