Grouped tooth electric motor

Patent metadata

Field	Value
Publication number	US-10651713-B2
Application number	US-201615204500-A
Country	US
Kind code	B2
Filing date	Jul 7, 2016
Priority date	Jul 7, 2016
Publication date	May 12, 2020
Grant date	May 12, 2020

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. In an embodiment, such non-uniform angular spacing may be such that for at least a subset of the rotor teeth comprising a first, second, and third rotor tooth, an angular spacing between the first and the second rotor teeth is at least twice an angular spacing between the second and the third rotor teeth.

First claim

What is claimed is:

1. An apparatus comprising:
a rotor to have a plurality of rotor teeth, wherein the plurality of rotor teeth are to be arranged to have a non-uniform angular spacing; and
a stator to have a plurality of stator teeth,
wherein the rotor to be disposed within the stator, wherein the non-uniform angular spacing of the plurality of rotor teeth to be such that for at least a subset of the plurality of rotor teeth to comprise a first rotor tooth having a first tooth axis, a second rotor tooth having a second tooth axis, and a third rotor tooth having a third tooth axis, the first, second, and third rotor teeth to be arranged consecutively, a first angle between the first tooth axis and the second tooth axis to be at least twice that of a second angle between the second tooth axis and the third tooth axis,
wherein the rotor to comprise a trench depth greater than or equal to one half an arc length between adjacent rotor teeth of the plurality of rotor teeth, wherein the arc length between the adjacent rotor teeth to be equal to or greater than any other arc length between any other adjacent teeth of the plurality of rotor teeth, wherein the arc length to comprise a distance between radially outward extremities of interior surfaces of the adjacent rotor teeth, and wherein the any other arc length to comprise another distance between radially outward extremities of interior surfaces of the any other adjacent rotor teeth.

2. The apparatus of claim 1 , wherein a ratio of stator teeth to rotor teeth to be between 2.5 and 3.5 to 1.

3. The apparatus of claim 1 , wherein the plurality of stator teeth to comprise aluminum coil windings.

4. An apparatus comprising:
a rotor to have a plurality of rotor teeth, wherein the plurality of rotor teeth to be arranged to have a non-uniform angular spacing; and
a stator to have a plurality of stator teeth,
wherein the rotor to be disposed within the stator, wherein the rotor to comprise a trench depth greater than or equal to one half an arc length between adjacent rotor teeth of the plurality of rotor teeth, wherein the arc length between the adjacent rotor teeth to be equal to or greater than any other arc length between any other adjacent teeth of the plurality of rotor teeth, wherein the arc length to comprise a distance between radially outward extremities of interior surfaces of the adjacent rotor teeth, and wherein the any other arc length to comprise another distance between radially outward extremities of interior surfaces of the any other adjacent rotor teeth.

5. The apparatus of claim 4 further comprising:
means for generating a first electromagnetic force of a first magnitude on a first stator tooth of the plurality of stator teeth; and
means for generating a second electromagnetic force of a second magnitude less than the first magnitude on a second stator tooth of the plurality of stator teeth, wherein the second stator tooth to be disposed adjacent to the first stator tooth,
wherein the first magnetic force to provide a torque to one or more of the plurality of rotor teeth.

6. An electric motor comprising:
control circuitry to comprise a processing element and a driver;
a stator to comprise a plurality of stator teeth having one or more coil windings electrically coupled to the control circuitry; and
a rotor to be disposed within the stator and to comprise a plurality of rotor teeth, wherein the plurality of rotor teeth comprise a non-uniform angular spacing,
wherein the non-uniform angular spacing of the plurality of rotor teeth to be such that for at least a subset of the plurality of rotor teeth comprising a first rotor tooth having a first tooth axis, a second rotor tooth having a second tooth axis, and a third rotor tooth having a third tooth axis, the first, second, and third rotor teeth being arranged consecutively, a first angle between the first tooth axis and the second tooth axis to be at least twice that of a second angle between the second tooth axis and the third tooth axis,
wherein the rotor to have a trench depth greater than or equal to one half an arc length between adjacent rotor teeth of the plurality of rotor teeth, wherein the arc length between the adjacent rotor teeth to be equal to or greater than any other arc length between any other adjacent teeth of the plurality of rotor teeth, wherein the arc length to comprise a distance between radially outward extremities of interior surfaces of the adjacent rotor teeth, and wherein the any other arc length to comprise another distance between radially outward extremities of interior surfaces of the any other adjacent rotor teeth.

7. The electric motor of claim 6 , wherein the control circuitry further to comprise circuitry to recapture charge.

8. The electric motor of claim 7 , wherein the circuitry to recapture charge to comprise at least one switch and at least one charge storage device.

9. The electric motor of claim 8 , wherein responsive to one or more current pulses from the control circuitry the rotor to be capable of rotating at at least approximately 4000 RPM.

10. The electric motor of claim 6 , wherein the plurality of stator teeth to comprise aluminum coil windings.

11. The electric motor of claim 6 , wherein
the control circuitry to generate a first electromagnetic force of a first magnitude on a first stator tooth of the plurality of stator teeth,
the control circuitry further to generate a second electromagnetic force of a second magnitude less than the first magnitude on a second stator tooth of the plurality of stator teeth, the second stator tooth to be disposed adjacent to the first stator tooth, and
the first magnetic force to provide a torque to one or more of the non-uniformly angularly spaced rotor teeth of the rotor.

12. An electric motor comprising:
control circuitry to comprise a processing element and a driver;
a stator to comprise a plurality of stator teeth having one or more coil windings electrically coupled to the control circuitry; and
a rotor to be disposed within the stator and to comprise a plurality of rotor teeth, wherein the plurality of rotor teeth comprise a non-uniform angular spacing,
wherein the rotor to have a trench depth greater than or equal to one half an arc length between adjacent rotor teeth of the plurality of rotor teeth, wherein the arc length between the adjacent rotor teeth to be equal to or greater than any other arc length between any other adjacent teeth of the plurality of rotor teeth, wherein the arc length to comprise a distance between radially outward extremities of interior surfaces of the adjacent rotor teeth, and wherein the any other arc length to comprise another distance between radially outward extremities of interior surfaces of the any other adjacent rotor teeth.

Assignees

• Advanced Risc Mach Ltd

Inventors

• Pietromonaco David Victor

Classifications

• H02K19/06

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

• H02K19/103 Primary

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

• H02K1/246 Primary

  Variable reluctance rotors · CPC title

• H02K3/18

  Windings for salient poles · CPC title

• H02K1/24

  Rotor cores with salient poles {; Variable reluctance rotors} · CPC title