AC motor winding pattern
View Patent ↗A motor winding arrangement that is capable of delivering relatively flat torque over a wide range of speeds, thus achieving increasing power throughout its operating range, is provided. In a multi-phase, e.g., three-phase, motor utilizing the winding arrangement of the invention, each winding layer corresponds to one phase of the motor and occupies every slot of the stator. The poles for each winding layer consist of concentric and non-overlapping coils.
1. An electric motor, comprising:
a stator with a plurality of slots; and
a plurality of overlapping winding layers, wherein each of said plurality of overlapping winding layers corresponds to a phase of said electric motor, wherein each of said plurality of overlapping winding layers occupies every slot of said plurality of slots, wherein each of said plurality of overlapping winding layers is comprised of a plurality of poles, and wherein each pole of said plurality of poles is comprised of a plurality of concentric and non-overlapping coils.
2. A three-phase electric motor, comprising:
a stator with a plurality of slots;
a first winding layer corresponding to a first phase of said three-phase electric motor, wherein said first winding layer occupies every slot of said plurality of slots, wherein said first winding layer comprises a first plurality of poles, and wherein each pole of said first plurality of poles is comprised of a plurality of concentric and non-overlapping coils;
a second winding layer corresponding to a second phase of said three-phase electric motor, wherein said second winding layer occupies every slot of said plurality of slots, wherein said second winding layer comprises a second plurality of poles, and wherein each pole of said second plurality of poles is comprised of a plurality of concentric and non-overlapping coils; and
a third winding layer corresponding to a third phase of said three-phase electric motor, wherein said third winding layer occupies every slot of said plurality of slots, wherein said third winding layer comprises a third plurality of poles, and wherein each pole of said third plurality of poles is comprised of a plurality of concentric and non-overlapping coils.
3. The three-phase electric motor of claim 2 , wherein a first number of poles corresponding to said first plurality of poles is equivalent to a second number of poles corresponding to said second plurality of poles and is equivalent to a third number of poles corresponding to said third plurality of poles.
4. The three-phase electric motor of claim 2 , wherein said first plurality of poles corresponds to four poles, wherein said second plurality of poles corresponds to four poles, and wherein said third plurality of poles corresponds to four poles.
5. The three-phase electric motor of claim 2 , wherein there is no overlap between the concentric and non-overlapping coils comprising adjacent poles of said first plurality of poles, and wherein there is no overlap between the concentric and non-overlapping coils comprising adjacent poles of said second plurality of poles, and wherein there is no overlap between the concentric and non-overlapping coils comprising adjacent poles of said third plurality of poles.
6. The three-phase electric motor of claim 2 , wherein the concentric and non-overlapping coils comprising a pole of said first plurality of poles are wound in an opposite direction from the concentric and non-overlapping coils comprising an adjacent pole of said first plurality of poles, and wherein the concentric and non-overlapping coils comprising a pole of said second plurality of poles are wound in an opposite direction from the concentric and non-overlapping coils comprising an adjacent pole of said second plurality of poles, and wherein the concentric and non-overlapping coils comprising a pole of said third plurality of poles are wound in an opposite direction from the concentric and non-overlapping coils comprising an adjacent pole of said third plurality of poles.
7. The three-phase electric motor of claim 2 , wherein each pole of said first plurality of poles is comprised of the same number of concentric and non-overlapping coils, wherein each pole of said second plurality of poles is comprised of the same number of concentric and non-overlapping coils, and wherein each pole of said third plurality of poles is comprised of the same number of concentric and non-overlapping coils.
8. The three-phase electric motor of claim 2 , wherein each pole of said first, second and third pluralities of poles is comprised of the same number of concentric and non-overlapping coils.
9. The three-phase electric motor of claim 2 , wherein the plurality of slots (N S ) is equal to (2N C )(N P ), where N C is equal to the number of concentric and non-overlapping coils per pole and N P is equal to number of poles per phase.
10. The three-phase electric motor of claim 9 , wherein N C is an even number.
11. The three-phase electric motor of claim 2 , wherein said first plurality of poles corresponds to four poles, wherein said second plurality of poles corresponds to four poles, wherein said third plurality of poles corresponds to four poles, and wherein said plurality of slots corresponds to 48 slots.
12. The three-phase electric motor of claim 2 , wherein each coil of said concentric and non-overlapping coils of said first, second and third pluralities of poles is comprised of at least two turns.