Permanent magnet offset systems and methods
View Patent ↗A magnetic flux offset system selectively modifies the magnetic force at effective poles of a magnetic flux element. Magnetic flux from each effective pole is enhanced and/or effectively nullified using a control coil. The control coil directs magnetic flux from a magnetic flux donor to nullify magnetic flux from a flux donor at one effective pole. Magnetic flux from the control coil could also add to the magnetic flux from a flux donor at another effective pole. Reversing the current to the control coil could switch the effective pole where the magnetic flux is nullified and the effective pole where the magnetic flux is enhanced.
1. A magnetic flux offset system comprising:
a magnetic flux element having a first effective pole and a second effective pole, wherein the magnetic flux element comprises at least one magnetic path from the first effective pole to the second effective pole through the magnetic flux element;
a first, second, and third magnetic flux donor,
wherein the first and second magnetic flux donors are magnetically coupled to the magnetic flux element proximate to the first and second effective poles, respectively,
wherein the third magnetic flux donor includes a first permanent magnet within the magnetic flux element and a second permanent magnet contiguously coupled to the magnetic flux element between the first and second magnetic flux donors,
wherein the first and second magnetic flux donors exhibit a first polarity to the magnetic flux element, and
wherein the third magnetic flux donor exhibits a second polarity, opposite the first polarity, to the magnetic flux element; and
a control coil wrapped around the magnetic flux element,
wherein the control coil has a first active magnetic state that aggregates with, and directs, magnetic flux from the third magnetic flux donor to substantially nullify magnetic flux from the second magnetic flux donor at the second effective pole, and
wherein the control coil has a second active magnetic state that aggregates with, and directs, magnetic flux from the third magnetic flux donor to substantially nullify magnetic flux from the first magnetic flux donor at the first effective pole.
2. The magnetic flux offset system of claim 1 ,
wherein the first effective pole exhibits the first polarity when the control coil is in the first active magnetic state, and
wherein the second effective pole exhibits the first polarity when the control coil is in the second active magnetic state.
3. The magnetic flux offset system of claim 1 further comprising a magnetic flux yoke that completes a magnetic circuit between the first, second, and third magnetic flux donors.
4. The magnetic flux offset system of claim 3 further comprising fourth and fifth magnetic flux donors magnetically coupled to the magnetic flux element proximate to the first and second effective poles, respectively, and wherein the fourth and fifth magnetic flux donors exhibit the first polarity.
5. The magnetic flux offset system of claim 4 ,
wherein the first active magnetic state further aggregates with, and directs, magnetic flux from the third magnetic flux donor to substantially nullify magnetic flux from the fifth magnetic flux donor at the second effective pole, and
wherein the second active magnetic state further aggregates with, and directs, magnetic flux from the third magnetic flux donor to substantially nullify magnetic flux from the fourth magnetic flux donor at the first effective pole.
6. The magnetic flux offset system of claim 1 , wherein the first, second, and third magnetic flux donors are permanent magnets.
7. The magnetic flux offset system of claim 6 , further comprising:
a fourth magnetic flux donor, disposed in the gap, that exhibits the first polarity,
a fifth magnetic flux donor, disposed in the gap, that exhibits the second polarity,
wherein the fifth magnetic flux donor is magnetically coupled to, and donates magnetic flux of the second polarity to, a first portion of the magnetic flux element on a first side of the gap, and
wherein the fourth magnetic flux donor is magnetically coupled to, and donates magnetic flux of the first polarity to, a second portion of the magnetic flux element on a second side of the gap opposite to the first side of the gap.
8. The magnetic flux element of claim 7 , wherein the third and fifth magnetic flux donors are magnetically coupled to opposing sides of the first portion of the magnetic flux element.
9. The magnetic flux offset system of claim 7 further comprising sixth and seventh magnetic flux donors magnetically coupled to the magnetic flux element proximate to the first and second effective poles, respectively, and wherein the sixth and seventh magnetic flux donors exhibit the first polarity.
10. The magnetic flux offset system of claim 1 , wherein the magnetic flux element further comprises a gap that at least partially extends into the control coil toward the first effective pole and extends at least partially into the control coil toward the second effective pole.
11. The magnetic flux offset system of claim 1 , wherein the control coil is wrapped around the flux element between the first and third magnetic flux elements and between the second and third magnetic flux elements.
12. A motor comprising:
a magnetic flux element having a first effective pole and a second effective pole, wherein the magnetic flux element comprises at least one magnetic path from the first effective pole to the second effective pole through the magnetic flux element;
a first, second, and third magnetic flux donor,
wherein the first and second magnetic flux donors are magnetically coupled to the magnetic flux element proximate to the first and second effective poles, respectively,
wherein the third magnetic flux donor includes a first permanent magnet within the magnetic flux element and a second permanent magnet contiguously coupled to the magnetic flux element between the first and second magnetic flux donors,
wherein the first and second magnetic flux donors exhibit a first polarity to the magnetic flux element, and
wherein the third magnetic flux donor exhibits a second polarity, opposite the first polarity, to the magnetic flux element, and
a control coil wrapped around the magnetic flux element,
wherein the control coil has a first active magnetic state that aggregates with, and directs, magnetic flux from the third magnetic flux donor to substantially nullify magnetic flux from the second magnetic flux donor at the second effective pole, and
wherein the control coil has a second active magnetic state that aggregates with, and directs magnetic flux from the third magnetic flux donor to substantially nullify magnetic flux from the first magnetic flux donor at the first effective pole,
wherein the second effective pole exhibits the first polarity when the control coil is in the second active magnetic state, and
a rotor having a first ferrous element and a second ferrous element that both rotatively pass through effective magnetic fields of the first effective pole when the control coil is in the first active magnetic state and the second effective pole when the control coil is in the second active magnetic state.
13. The motor of claim 12 , wherein the first ferrous element has a permanent magnet.
14. The motor of claim 12 , wherein the first ferrous element is located at a first ferrous portion of a rotor perimeter and the second ferrous element is located at second ferrous portion of the rotor perimeter.
15. The motor of claim 14 , wherein the rotor comprises an odd number of ferrous portions.