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1. (WO2019028031) HIGH TORQUE LOW INERTIA BRUSHLESS MOTOR
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What is Claimed is:

1. A brushless motor comprising:

a stator defining an aperture extending axially therein, the stator further defining a series of slots, the series of slots consisting of first and second pairs of opposing slots, wherein the second pair of opposing slots are generally aligned orthogonally to the first pair of opposing slots;

a rotor having a two-pole diametral-magnetized magnet bidirectionally operable within the aperture, wherein a separation is formed between the magnet and the stator;

a first electrical coil within the first pair of slots, wherein the first electrical coil is excitable for providing bidirectional torque to the rotor over a first limited range of angles; and a second electrical coil within the second pair of slots, wherein the second electrical coil is excitable for providing bidirectional torque to the rotor over a second limited range of angles that are orthogonal to the first limited range of angles provided by the first electrical coil.

2. The brushless motor of claim 1, wherein a depth dimension of the slots is greater than a width dimension of the coils.

3. The brushless motor of claim 1, wherein the first electrical coil comprises a first pair of electrical coils.

4. The brushless motor of claim 1, wherein the second coil comprises a second pair of electrical coils.

5. The brushless motor of claim 1, wherein the first electrical coil comprises a cosine coil.

6. The brushless motor of claim 1, wherein the second electrical coil comprises a sine coil.

7. The brushless motor of claim 1, wherein exciting the first electrical coil produces torque over a first range of angles.

8. The brushless motor of claim 1, wherein exciting the second electrical coil produces torque over a second range of angles.

9. The brushless motor of claim 1, the stator comprising magnetically-conductive stacked laminations.

10. The brushless motor of claim 1, wherein a distance between an outer peripheral surface of the stator and the slots is greater than or equal to the depth of the slot.

11. The brushless motor of claim 1, the stator comprising contoured protrusions between the slots, the contoured protrusions defining a uniform gap between the stator and the rotor.

12. The brushless motor of claim 11, the contoured protrusions defining a non-uniform gap between the stator and the rotor.

13. The brushless motor of claim 1, wherein the rotor magnet is integrally formed with a shaft, and wherein the shaft carries an optical element attached thereto.

14. The brushless motor of claim 13, wherein the optical element comprises at least one of a mirror, a prism, a grating disk, and an aperture wheel.

15. The brushless motor of claim 1, wherein the first and second electrical coils are externally pre-formed.

16. The brushless motor of claim 1, wherein a ratio of slot depth to aperture diameter is about 0.5.

17. The brushless motor of claim 1, wherein a ratio of slot width to aperture diameter is about 0.3.

18. A stator defining an aperture and a series of slots formed therein for use in a brushless motor, the series of slots consisting of:

a first pair of opposing slots configured for receiving a first electrical coil; and

a second pair of opposing slots configured for receiving a second electrical coil, the second pair of slots generally aligned orthogonally to the first pair of slots.

19. The stator of claim 18, wherein the stator material defines a contoured end between each slot.

20. The stator of claim 18, wherein a distance between an outer peripheral surface of the stator and at least one slot is at least as great as a depth dimension of a slot.

21. The stator of claim 18, wherein the slots each define a non-uniform curvature of stator material.

22. A brushless motor comprising:

a stator defining an aperture extending axially therein;

a rotor having a magnet bidirectionally operable within the aperture, wherein a separation is formed between the magnet and the stator;

a first pair of slots formed within the stator;

a second pair of slots formed within the stator, the second pair of slots generally aligned orthogonally to the first pair of slots;

a first electrical coil within the first pair of slots, wherein the first electrical coil is excitable for providing bidirectional torque to the rotor over a first limited range of angles; and a second electrical coil within the second pair of slots, wherein the second electrical coil is excitable for providing bidirectional torque to the rotor over a second limited range of angles that are orthogonal to the first limited range of angles provided by the first electrical coil.

23. The brushless motor of claim 22, wherein the magnet comprises a two-pole diametral-magnetized magnet.