Granted Patent B2

US 12,483,103 · App. 18/440,479 · Granted Nov 25, 2025

Inventors: Nicolaus Radford (Webster, TX); Mohammadreza Barzegaranbaboli (Webster, TX); Ahmed Morsy (Webster, TX)

Assignee: Jacobi Motors, LLC

H02K21/12H02K29/12H02P6/182

Abstract

Claims (42)

1 . A method of operating a flux-mnemonic permanent magnet synchronous machine (FMPMSM), the FMPMSM comprising:

an annular stator having a winding;

a rotor disposed with a stator, the rotor comprising:

at least two permanent magnets, each of the permanent magnets having two poles normal to an air gap between the stator and rotor, the air gap having a nullified flux, both permanent magnets comprising a single magnet type with a coercivity less than 2000 Oe; and

one or more flux adjusters adjacent to one or more poles of at least one of the permanent magnets; and

a power inverter for dispensing at least one current pulse, wherein the power inverter has a microcontroller;

the method comprising:

realizing a first valued operational parameter by applying at least a first current pulse from the inverter to set a magnetic flux linkage between the rotor and stator; and

realizing a second valued operational parameter by applying at least a second current pulse to adjust the magnetic flux linkage to a magnetization state.

2 . The method of claim 1 , wherein the steps of realizing a first or a second valued operational parameter further comprises:

receiving, by the microcontroller, a command, and

determining, by the microcontroller, an ideal a target magnetization state based on the command.

3 . The method of claim 1 , wherein the steps of realizing a first or a second valued operational parameter comprises:

determining, by the microcontroller, a rotations per minute (RPM) of the FMPMSM;

determining, by the microcontroller, a torque of the FMPMSM, wherein the torque is determined based on a back electromagnetic force (emf) of the FMPMSM; and

determining, by the microcontroller, a target magnetization state based on the RPM and the torque.

4 . The method of claim 1 , wherein the step of applying the first or the second current pulse comprises:

measuring, by the microcontroller, a back electromagnetic force (emf) of the FMPMSM;

determining, by the microcontroller, a real-time magnetization state based on the back emf;

determining, by the microcontroller, a magnetization difference by subtracting a target magnetization state from the real-time magnetization state; and

applying, by the microcontroller, the first or second current pulse based on the magnetization difference.

5 . The method of claim 4 , further comprising the step of correcting by the microcontroller, the back emf from transient errors.

6 . The method of claim 4 , wherein the step of determining, by the microcontroller, comprises at least one of a duration, a shape, and/or a number, of the at least first or second current pulse based on a rotations per minute (RPM) or a torque of the FMPMSM.

7 . A method of operating a flux-mnemonic permanent magnet synchronous machine (FMPMSM), the FMPMSM comprising:

an annular stator having a winding

a rotor disposed concentric with a stator, the rotor comprising:

at least two circumferentially magnetized adjustable permanent magnets, each of the permanent magnets having two poles normal to an air gap between the stator and rotor, the air gap having a nullified flux, both permanent magnets comprising a single magnet type with a coercivity less than 2000 Oe; and

a flux barrier between the poles of each of the permanent magnets; and

power inverter for dispensing an excitation current and at least one current pulse, the inverter having a microcontroller;

the method comprising:

selecting a first valued operational parameter;

specifying a range for the first valued operational parameter;

applying at least a first current pulse from the power inverter to set a magnetic flux linkage between the rotor and stator to achieve the first valued operational parameter;

selecting a second valued operational parameter;

applying at least a second current pulse from the power inverter to adjust the magnetic flux linkage to a magnetization state corresponding to the second valued operational parameter;

wherein a difference between the first and second valued operational parameters is within the range, and

wherein the at least first and second current pulses comprise a plurality of primitive pulses each having a duration of less than or equal to 2 ms.

8 . A method of changing a magnetic flux density in an air gap between a stator and a rotor in a real-time flux-mnemonic permanent magnet synchronous machine comprising at least two permanent magnets and an air gap, the air gap having a nullified flux, the at least two permanent magnets both comprising a single magnet type with a coercivity less than 2000 Oe, the method comprising applying at least one current pulse to adjust a magnetic operating point of the magnets, wherein the at least one current pulse has a duration of less than 3 ms.

9 . The method of claim 8 , wherein the step of applying the at least one current pulses comprises consecutively applying a plurality of primitive pulses.

10 . The method of claim 9 , wherein at least one of the plurality of primitive pulses comprises a triangular pulses of less than or equal to 3 ms.

11 . The method of claim 10 , wherein the at least one primitive pules comprises a shape and a duration based on a power supply that provides required energy for magnetizing the at least two permanent magnets.

12 . A method of regulating magnetic polarization of permanent magnets in a real-time flux-mnemonic permanent magnet synchronous machine, the permanent magnets comprising at least two permanent magnets having an air gap, the air gap having a nullified flux, both comprising a single magnet type with a coercivity less than 2000 Oe, the method comprising the step of: using at least one current pulse having a duration of less than 3 ms.

Assignments (2)

Continuity (3)

References Cited (343)