Grouped tooth electric motor

Patent metadata

Field	Value
Publication number	US-11114925-B2
Application number	US-202016852849-A
Country	US
Kind code	B2
Filing date	Apr 20, 2020
Priority date	Jul 7, 2016
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

An electric motor may comprise a rotor and a stator comprising rotor and stator teeth, respectively. A non-uniform angular spacing or grouping of rotor teeth may facilitate desired rotational speeds of the rotor.

First claim

What is claimed is:

1. A method comprising:
generating a first electromagnetic force of a first magnitude on a first stator tooth of a stator of an electric motor; and
generating a second electromagnetic force of a second magnitude less than the first magnitude on a second stator tooth on the stator adjacent to the first stator tooth,
wherein the first and the second electromagnetic forces have the same polarity, and
wherein the first electromagnetic force provides a torque to one or more non-uniformly angularly spaced rotor teeth of a rotor of the electric motor.

2. The method of claim 1 further comprising generating a flowing wavefront using one or more DC pulses driven through one or more coil windings of the stator, wherein the flowing wavefront comprises a plurality of electromagnetic forces of varying magnitudes on a group of stator teeth on the stator in which the plurality of electromagnetic forces travels around the stator to simulate a wave.

3. The method of claim 1 , wherein the second magnitude is approximately half the first magnitude.

4. A method comprising:
generating a first electromagnetic force of a first magnitude on a first stator tooth of a stator of an electric motor;
generating a second electromagnetic force of a second magnitude less than the first magnitude on a second stator tooth on the stator adjacent to the first stator tooth,
wherein the first electromagnetic force provides a torque to one or more non-uniformly angularly spaced rotor teeth of a rotor of the electric motor; and
generating a third electromagnetic force on a third stator tooth of the electric motor, wherein the third stator tooth is on the stator adjacent to the first stator tooth and further wherein the third electromagnetic force has a third magnitude approximately equal to the second magnitude.

5. The method of claim 4 , wherein the second magnitude and/or the third magnitude decrease over a time period.

6. The method of claim 4 , wherein the second magnitude and/or the third magnitude increase over a time period.

7. A method comprising:
generating a first electromagnetic force of a first magnitude on a first stator tooth of a stator of an electric motor;
generating a second electromagnetic force of a second magnitude less than the first magnitude on a second stator tooth on the stator adjacent to the first stator tooth,
wherein the first electromagnetic force provides a torque to one or more non-uniformly angularly spaced rotor teeth of a rotor of the electric motor,
decreasing the first magnitude to yield a third magnitude; and
increasing the second magnitude of the second electromagnetic force to yield a fourth magnitude, wherein the third magnitude is approximately half the fourth magnitude.

8. The method of claim 7 further comprising generating a third electromagnetic force on a third stator tooth on the stator adjacent to the second stator tooth, wherein the third electromagnetic force has a fifth magnitude approximately equal to the third magnitude.

Assignees

• Advanced Risc Mach Ltd

Inventors

• Pietromonaco David Victor

Classifications

• H02P25/08

  Reluctance motors · CPC title

• H02K19/103 Primary

  Motors having windings on the stator and a variable reluctance soft-iron rotor without windings · CPC title

• H02K19/06

  Motors having windings on the stator and a variable-reluctance soft-iron rotor without windings, e.g. inductor motors · CPC title

• H02K11/33

  Drive circuits, e.g. power electronics (H02K11/38 takes precedence) · CPC title

• H02K11/0094

  Structural association with other electrical or electronic devices · CPC title