Brushless electric motor/generator

Patent metadata

Field	Value
Publication number	US-10263480-B2
Application number	US-201514866788-A
Country	US
Kind code	B2
Filing date	Sep 25, 2015
Priority date	Mar 20, 2012
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

Disclosed are various embodiments for a motor/generator comprising: a rotor adapted to rotate about a longitudinal axis, the rotor comprising a first partial toroidal magnetic cylinder defining a semi-circular tunnel, wherein the plurality of magnets forming the first partial toroidal magnetic cylinder have substantially all like poles facing inward toward the semi-circular tunnel, the semi-circular tunnel having an entrance and an exit forming an open throat defined by a space between the entrance and the exit, and a stator positioned about the longitudinal axis within a rotational path of the rotor.

First claim

The invention claimed is:

1. A DC generator/motor, comprising:
a housing;
a rotor, comprising
a first partial toroidal magnetically closed cylinder including
a first partial cylindrical magnetic wall positioned about a longitudinal axis and having a first end and a first opposing end,
a first opposing partial cylindrical magnetic wall positioned at a predetermined radial distance from the first partial cylindrical magnetic wall, having a second end and a second opposing end and having a first circumferential slot defined therein,
a first side wall portion spanning from the first end to the second end,
a first opposing side wall portion positioned at a first longitudinal distance from the first magnetic side wall spanning from the first opposing end to the second opposing end,
wherein the first partial cylindrical magnetic wall, the first opposing partial magnetic cylindrical wall, the first side wall portion, and the first opposing side wall portion each have a surface and a corresponding magnetic pole of a first polarity that points towards a sectional center of the first partial toroidal magnetically closed cylinder that generate flux forces within the first partial toroidal magnetically closed cylinder;
a center shaft positioned along the longitudinal axis and coupled to the first partial toroidal magnetically closed cylinder;
a stator comprising
a support ring coupled to the housing and having a portion sized to fit within the first circumferential slot,
a plurality of coils coupled to the support ring and positioned radially about the longitudinal axis such that the plurality of coils and are sized to allow the first partial toroidal magnetically closed cylinder to rotate about the plurality of coils,
a plurality of magnets fixedly coupled to the support ring and positioned proximal to the first circumferential slot, the plurality of magnets having a polarity orientated to redirect flux forces back into the first partial toroidal magnetically closed cylinder.

2. The DC generator/motor of claim 1 , wherein the first partial toroidal magnetically closed cylinder has an arc length about the longitudinal axis of greater than 180 degrees.

3. The DC generator/motor of claim 1 , wherein flux forces generated by the first partial toroidal magnetically closed cylinder flow from interior faces of the first partial toroidal magnetically closed cylinder towards the sectional center of the first partial toroidal magnetically closed cylinder, then flow in a direction generally parallel to the first portion of the a circular rotation path of the first partial toroidal magnetically closed cylinder.

4. The DC generator/motor of claim 1 , wherein the plurality of magnets fixedly coupled to the support ring are positioned on both sides of the support ring.

5. The DC generator/motor of claim 1 , wherein the plurality of magnets fixedly coupled to the support ring are positioned along a center axis of the support ring.

6. The DC generator/motor of claim 1 , further comprising a ring core coupled to the support ring and the plurality of coils such that each coil in the plurality of coils surround a portion of the core.

7. The DC generator/motor of claim 1 , wherein the housing is made from back iron material.

8. The DC generator/motor of claim 1 , wherein a space circumferentially adjacent to the first partial toroidal magnetically closed cylinder forms a throat.

9. The DC generator/motor of claim 8 , wherein a second partial toroidal magnetically closed cylinder is positioned within the throat.

10. The DC generator/motor of claim 8 , wherein a partial toroidal nonmagnetic cylinder is positioned within the throat.

11. A generator/motor, comprising:
a housing;
a rotor, comprising
a first partial toroidal magnetically closed cylinder comprising
a first partial cylindrical magnetic wall positioned about a longitudinal axis and having a first end and a first opposing end,
a first partial opposing cylindrical magnetic wall positioned at a predetermined radial distance from the first partial cylindrical magnetic wall, having a second end and a second opposing end and having a first circumferential slot defined therein,
a first magnetic side wall portion spanning from the first end to the second end, and
a first opposing side wall portion positioned at a longitudinal distance from the first magnetic side wall and spanning from the first opposing end to the second opposing end,
wherein the first partial cylindrical magnetic wall, the first opposing partial magnetic cylindrical wall, the first side wall portion, and the first opposing side wall portion each have a surface and a corresponding magnetic pole of a first polarity that points towards an interior of the first partial toroidal magnetically closed cylinder;
a second partial toroidal magnetically closed cylinder comprising
a second partial cylindrical magnetic wall positioned about the longitudinal axis and having a third end and a third opposing end,
a second opposing partial cylindrical magnetic wall positioned at a predetermined radial distance from the second partial cylindrical magnetic wall, having a fourth end and a fourth opposing end and having a second circumferential slot defined therein,
a second magnetic side wall portion spanning from the third end to the fourth end, and
a second opposing side wall portion positioned at the longitudinal distance from the second magnetic side wall and spanning from the third opposing end to the fourth opposing end,
wherein the second partial cylindrical magnetic wall, the second opposing partial magnetic cylindrical wall, the second side wall portion, and the second opposing side wall portion each have a surface and a corresponding magnetic pole of a second polarity that points away from an interior of the second partial toroidal magnetically closed cylinder;
wherein the first partial toroidal magnetically closed cylinder has an arc length about the longitudinal axis of greater than 180 degrees and the second partial toroidal magnetically closed cylinder has an arc length about the longitudinal axis of less than 180 degrees;
a center shaft positioned along the longitudinal axis and coupled to the rotor;
a stator comprising
a support ring coupled to the housing and positioned about the longitudinal axis such that a portion of the support ring is within the first circumferential slot and the second circumferential slot;
a center core positioned about the longitudinal axis and coupled to the support ring;
a plurality of coils coupled to the center core and positioned radially about the longitudinal axis such that the first partial toroidal magnetically closed cylinder and second partial toroidal magnetically closed cylinder can rotate about the longitudinal axis along a circular rotation path with respect to the plurality of coils.

12. The generator/motor of claim 11 , further comprising a plurality of magnets fixedly coupled to the support ring and positioned proximal to the first circumferential slot or the second circumferential slot, the plurality of magnets having a polarity orientated to redirect flux forces flowing back into either the first partial toroidal magnetically closed cylinder or the second partial toroidal magnetically closed cylinder.

13. The generator/motor of claim 12 , wherein the plurality of magnets fixedly coupled to the support ring are positioned on both sides of the support ring.

14. The DC generator/motor of claim 11 , wherein flux forces generated by the first partial toroidal magnetically closed cylinder flow from interior faces of the first partial toroidal magnetically closed cylinder towards t

Assignees

• Linear Labs Inc
• Linear Labs Llc

Inventors

• Hunstable Fred E

Classifications

• H02P6/183

  using an injected high frequency signal · CPC title

• H02P2207/05

  Synchronous machines, e.g. with permanent magnets or DC excitation · CPC title

• H02P6/17

  and for generating speed information · CPC title

• H02K21/12

  with stationary armatures and rotating magnets · CPC title

• H02K1/27 Primary

  Rotor cores with permanent magnets · CPC title