Circumferential flux electric machine with field weakening mechanisms and methods of use
There are presented various embodiments disclosed in this application, including methods and systems of arranging permanent magnets to switch from a first configuration designed for a first torque output to a second configuration designed for a second torque output.
1. A electrical machine, comprising:
an axial axis;
a toroidal tunnel positioned about the axial axis, the toroidal tunnel defined by:
a first rotor comprising a first plurality of permanent magnetic poles circumferentially spaced about the axial axis, wherein each magnetic pole in the first plurality of permanent magnetic poles faces towards an interior of the toroidal tunnel and has an opposite magnetic polarity from its adjacent magnetic poles;
a second rotor comprising and positioned opposing the first rotor, the second rotor comprising a second plurality of permanent magnetic poles circumferentially spaced about the axial axis, wherein each magnetic pole in the second plurality of permanent magnetic poles faces towards the interior of the toroidal tunnel and has an opposite magnetic polarity from its adjacent magnetic poles;
the toroidal tunnel adapted to rotate from a first magnetic pole configuration where the magnetic poles of the first plurality and second plurality of magnetic poles are radially aligned with respect to the axial axis to produce a first level of electromagnetic torque, to a second magnetic pole configuration where the magnetic poles of the second plurality of magnetic poles are angularly rotated with respect to the axial axis to produce a second level of electromagnetic torque,
a first rotation actuator coupled to at least one of the rotors for mechanically rotating a portion of the toroidal tunnel from the first magnetic pole configuration to the second magnetic pole configuration, and
a coil assembly positioned within the toroidal tunnel.
2. The electrical machine of claim 1 , wherein the first rotor comprises an outside cylindrical wall positioned about the axial axis and the second rotor comprises an inside cylindrical wall positioned about the axial axis and positioned opposing the first cylindrical wall.
3. The electrical machine of claim 1 , wherein the toroidal tunnel further comprises:
a third rotor positioned about the axial axis and positioned axially adjacent to the first rotor and second rotor, wherein the third rotor comprises a third plurality of permanent magnetic poles circumferentially spaced about the axial axis, wherein each magnetic pole in the third plurality of permanent magnetic poles faces towards the interior of the toroidal tunnel and has an opposite magnetic polarity from its adjacent magnetic poles; and
a fourth rotor positioned about the axial axis and positioned axially adjacent to the first rotor and second rotor, and axially from the third rotor, wherein the fourth rotor comprises a fourth plurality of permanent magnetic poles circumferentially spaced about the axial axis, wherein each magnetic pole in the fourth plurality of permanent magnetic poles faces towards the interior of the toroidal tunnel and has an opposite magnetic polarity from its adjacent magnetic poles.
4. The electrical machine of claim 3 , wherein the third rotor comprises a first side wall positioned adjacent to the outer cylindrical wall and inner cylindrical wall and the fourth rotor comprises an opposing side wall positioned adjacent to the outer cylindrical wall and inner cylindrical wall and axially away from the first side wall.
5. The electrical machine of claim 4 , wherein in the first magnetic pole configuration, north magnetic pole polarities of the first plurality of permanent magnetic poles, the second plurality of permanent magnetic poles, the third plurality of permanent magnetic poles, and the fourth plurality of permanent magnetic poles are all axially and radially aligned to form a NNNN magnetic pole configuration.
6. The electrical machine of claim 4 , wherein in the second magnetic pole configuration, north magnetic pole polarities of the first plurality of permanent magnetic poles and the north magnetic pole polarities of the second plurality of permanent magnetic poles oppose each other and are radially aligned with the south magnetic pole polarities of the third plurality of permanent magnetic poles and fourth plurality of permanent magnetic poles to form a NSNS magnetic pole configuration.
7. The electrical machine of claim 6 , wherein the first rotation actuator is mechanically coupled to the third rotor such that the third rotor can rotate independently of the first rotor and second rotor from the first magnetic pole configuration, through a predetermined angle of rotation, to the second magnetic pole configuration.
8. The electrical machine of claim 7 , further comprising a second rotation actuator which is coupled to the fourth rotor such that the fourth rotor can rotate independently of the first rotor and the second rotor from the first magnetic pole configuration, through the predetermined angle of rotation to the second magnetic pole configuration.
9. The electrical machine of claim 6 , wherein the first rotation actuator is mechanically coupled to both the third rotor and fourth rotor such that the third and fourth rotors can rotate independently of the first rotor and second rotor from the first magnetic pole configuration, through the predetermined angle of rotation, to the second magnetic pole configuration.
10. The electrical machine of claim 4 , wherein in the second magnetic pole configuration, north magnetic pole polarities of the first plurality of permanent magnetic poles and the north magnetic pole polarities of the third plurality of permanent magnetic poles are axially adjacent to each other and oppose the south magnetic pole polarities of the second plurality of permanent magnetic poles and fourth plurality of permanent magnetic poles to form a NNSS magnetic pole configuration.
11. The electrical machine of claim 10 , wherein the first rotation actuator is mechanically coupled to both the first rotor and third rotor such that the first and third rotors can rotate independently of the second rotor and fourth rotor from the first magnetic pole configuration, through the predetermined angle of rotation, to the second magnetic pole configuration.
12. A method of producing electric electromotive rotation comprising:
positioning a toroidal tunnel about the axial axis, the toroidal tunnel defined by:
a first rotor comprising a first plurality of permanent magnetic poles circumferentially spaced about the axial axis, wherein each magnetic pole in the first plurality of permanent magnetic poles faces towards an interior of the toroidal tunnel and has an opposite magnetic polarity from its adjacent magnetic poles;
a second rotor comprising and positioned opposing the first rotor, the second rotor comprising a second plurality of permanent magnetic poles circumferentially spaced about the axial axis, wherein each magnetic pole in the second plurality of permanent magnetic poles faces towards the interior of the toroidal tunnel and has an opposite magnetic polarity from its adjacent magnetic poles;
a third rotor positioned about the axial axis and positioned axially adjacent to the first rotor and second rotor, wherein the third rotor comprises a third plurality of permanent magnetic poles circumferentially spaced about the axial axis, wherein each magnetic pole in the third plurality of permanent magnetic poles faces towards the interior of the toroidal tunnel and has an opposite magnetic polarity from its adjacent magnetic poles; and
a fourth rotor positioned about the axial axis and positioned axially adjacent to the first rotor and second rotor, and axially from the third rotor, wherein the fourth rotor comprises a fourth plurality of permanent magnetic poles circumferentially spaced about the axial axis, wherein each magnetic pole in the fourth plurality of permanent magnetic poles faces towards the interior of the toroidal tunnel and has an opposite magnetic polarity from its adjacent magnetic poles,
applying current to a coil assembly positioned within the toroidal tunnel to apply an electromagnetic force to the rotors, and
rotating at least one rotor defining the toroidal tunnel from a first magnetic pole configuration where the magnetic poles of the first, second, third, and fourth plurality of magnetic poles are radially aligned with respect to the axial axis to produce a first level of electromagnetic torque, to a second magnetic pole configuration where at least the magnetic poles of the first plurality of magnetic poles are angularly rotated with respect to the axial axis to produce a second level of electromagnetic torque.
13. The method of claim 12 , wherein in the first magnetic pole configuration, north magnetic pole polarities of the first plurality of permanent magnetic poles, the second plurality of permanent magnetic poles, the third plurality of permanent magnetic poles, and the fourth plurality of permanent magnetic poles are all axially and radially aligned to form a NNNN magnetic pole configuration.
14. The method of claim 12 , wherein in the second magnetic pole configuration, north magnetic pole polarities of the first plurality of permanent magnetic poles and the north magnetic pole polarities of the second plurality of permanent magnetic poles oppose each other and are radially aligned with the south magnetic pole polarities of the third plurality of permanent magnetic poles and fourth plurality of permanent magnetic poles to form a NSNS magnetic pole configuration.
15. The method of claim 12 , wherein in the second magnetic pole configuration, north magnetic pole polarities of the first plurality of permanent magnetic poles and the north magnetic pole polarities of the third plurality of permanent magnetic poles are axially adjacent to each other and oppose the south magnetic pole polarities of the second plurality of permanent magnetic poles and fourth plurality of permanent magnetic poles to form a NNSS magnetic pole configuration.
16. The method of claim 12 , wherein the rotating at least one rotor defining the toroidal tunnel further comprises rotating the third rotor independently of the first rotor and second rotor from the first magnetic pole configuration, through a predetermined angle of rotation, to the second magnetic pole configuration.
17. The method of claim 12 , wherein the rotating at least one rotor defining the toroidal tunnel further comprises rotating the fourth rotor independently of the first rotor and the second rotor from the first magnetic pole configuration, through the predetermined angle of rotation to the second magnetic pole configuration.
18. The method of claim 12 , wherein the rotating at least one rotor defining the toroidal tunnel further comprises rotating both the third rotor and fourth rotor independently of the first rotor and second rotor from the first magnetic pole configuration, through the predetermined angle of rotation, to the second magnetic pole configuration.
19. The method of claim 12 , wherein the rotating at least one rotor defining the toroidal tunnel further comprises rotating the first rotor and third rotor independently of the second rotor and fourth rotor from the first magnetic pole configuration, through the predetermined angle of rotation, to the second magnetic pole configuration.