Electric motor
A stator comprises multiple, stacked laminations, which collectively define a core having a number of posts arranged circumferentially about the core. Each post extends into two prongs defining a first slot between the prongs. The spacing between each posts and its two prongs defines a second slot having a radially inner and outer slot. The outer slot geometry has an increasing width extending radially outward from the radially inner end, and transitioning to a decreasing width extending to the radially outer end.
1. A stator for an electric motor for a ceiling fan, the stator comprising:
a core having a plurality of posts arranged circumferentially about the core;
wherein each post of the plurality of post include a set of prongs, and where the plurality of posts collectively define a first set of slots, with each slot of the first set of slots located between each two adjacent posts of the plurality of posts and including an inner winding slot and a flux gap in communication with the inner winding slot and provided radially outside of the inner winding slot, wherein the flux gap includes a non-linear diverging portion that has a radial length of 60% of the flux gap and a non-linear converging portion that has a radial length of 40% of the flux gap located radially outward of the diverging portion;
a first neck provided at a radially inner end of the flux gap and defining a first opening; and
a second neck provided at a radially outer end of the flux gap, opposite the first neck, and the second neck defining a second opening; and
wherein the diverging portion and the converging portion have a substantially oval shape located between the first neck and the second neck.
2. The stator of claim 1 wherein the first neck forms a junction between the winding slot and the flux gap.
3. The stator of claim 1 wherein the first neck provides an anchor point for positioning insulators at the inner winding slot to prevent sliding of a coil winding extending between two of the inner winding slots.
4. The stator of claim 1 wherein a width of the prongs varies in a radial direction relative to the core.
5. The stator of claim 4 wherein the width of the set of prongs increases extending radially outwardly relative to the core.
6. The stator of claim 4 further comprising a second slot defined between the set of prongs from the same post, which collectively form a second set of slots.
7. The stator of claim 6 wherein the first set of slots includes eight to twelve slots and the second set of slots includes eight to twelve slots.
8. The stator of claim 1 wherein a transition between the diverging portion and the converging portion across a radial length of the flux gap defines an arcuate profile.
9. An electric motor for a ceiling fan comprising:
a motor shaft extending in an axial direction;
a stator coupled to the motor shaft, having a core with a central opening receiving the motor shaft, and plurality of posts arranged circumferentially about the core, the stator including a slot defined between adjacent posts, to define a set of slots, wherein each post of the plurality of posts include a set of prongs, and each slot including a winding slot and a flux gap, which is in communication with the winding slot and provided radially outside of the winding slot relative to the central opening;
a first neck provided at a radially inner end of the flux gap and defining a first opening; and
a second neck provided at a radially outer end of the flux gap, opposite the first neck, and the second neck defining a second opening;
wherein the flux gap includes a diverging portion that has a radial length 60% of the flux gap and a converging portion that has a radial length 40% of the flux gap, the diverging portion and converging portion having a substantially oval shape located between the first neck and the second neck.
10. The electric motor of claim 9 further comprising:
a plurality of coil windings wound about the winding slots and extending between adjacent pairs of slots;
wherein the first neck provides an anchor point for positioning insulators to prevent sliding of the plurality of coil windings.
11. The stator of claim 10 wherein a width of the prongs increases radially outwardly.
12. A stator for an electric motor comprising:
a core with a central opening and having plurality of circumferentially arranged posts, each post having two spaced prongs;
a slot defined between adjacent posts to collectively define a set of slots, the slot including an inner winding slot and a flux gap in communication with the inner winding slot and provided radially outside of the inner winding slot relative to the central opening, wherein the flux gap has a set of opposing sidewalls which diverge to define a diverging portion that has a radial length 60% of the flux gap and then converge to define a converging portion that has a radial length 40% of the flux gap;
a first neck provided at a radially inner end of the flux gap and defining a first opening; and
a second neck provided at a radially outer end of the flux gap, opposite the first neck, and the second neck defining a second opening;
wherein the diverging portion and the converging portion have a substantially oval shape located between the first neck and the second neck.
13. The stator of claim 12 wherein the set of opposing sidewalls are nonlinear.
14. The stator of claim 13 wherein the set of opposing sidewalls are concave relative to the flux gap along the radial length of the flux gap.
15. The stator of claim 14 wherein sidewalls define a radius of curvature and a local radius of curvature increases extending radially outward.
16. The stator of claim 13 wherein the set of opposing sidewalls are convex along at least a portion of the flux gap.
17. The stator of claim 12 wherein at least a portion of the opposing sidewalls are linear.
18. The stator of claim 12 wherein the converging portion is positioned radially outside of the diverging portion.
19. The stator of claim 12 wherein the set of opposing sidewalls are both linear and non-linear.