Motor having figure 8-shaped linked coils and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016380497-A1
Application number	US-201615183873-A
Country	US
Kind code	A1
Filing date	Jun 16, 2016
Priority date	Jun 25, 2015
Publication date	Dec 29, 2016
Grant date	—

Abstract

In a motor, the number of slots 6N divided by the number of pole pairs P (2N>P) of a rotor is an irreducible fraction, when a quotient obtained by dividing 6N by 2P is denoted by X, 2N coils per phase are arranged in the slots of the stator, one and another one of the coils connected in series thereto are arranged overlapping in one center slot while sharing one side with aligned current directions, opposite sides of the two coils not sharing the slot are each arranged in other ones of the slots at a distance by X from the center slot, so that the two coils are arranged while being linked in a figure 8 -shape straddling over the three slots, and N sets per phase of the linked coils are arranged at not completely overlapping positions in the slots and are connected in series.

First claim

What is claimed is:

1 . A three-phase alternating current motor comprising:
a rotor having a plurality of pairs of magnetic poles; a stator being formed in a direction of a rotation axis of the rotor, having a plurality of circumferentially arrayed slots and being arranged radially facing the rotor; and a plurality of windings being inserted into the slots and being wound around the stator, wherein when a number of poles of the rotor is denoted by 2P and a number of slots in which windings of the stator are inserted is denoted by 6N, the number of slots 6N divided by a number of pole pairs P is an irreducible fraction and a relation 2N>P stands, and wherein in the stator of the three-phase alternating current motor, when a quotient obtained by dividing the number of slots 6N by the number of poles 2P is denoted by X, 2N coils per phase of a predetermined number of windings are arranged in the slots of the stator, one of the coils and another one of the coils connected in series thereto are arranged overlapping in one center slot while sharing one side with current directions thereof being aligned, opposite sides of the two coils not sharing the slot are each arranged in other ones of the slots at a distance by X from the center slot, so that the two coils are arranged while being linked in a figure 8-shape straddling over the three slots, and N sets per phase of the figure 8-shaped linked coils are arranged at not completely overlapping positions in the slots of the stator and are connected in series.

2 . The three-phase alternating current motor according to claim 1 , wherein the two coils configuring the figure 8-shaped linked coils are connected in series without looseness.

3 . The three-phase alternating current motor according to claim 1 , wherein in a plurality of sets out of the N sets per phase of figure 8-shaped linked coils, one coil out of the linked two coils has a number of windings different from that of another coil.

4 . The three-phase alternating current motor according to claim 1 , wherein a plurality of sets out of N sets per phase of the figure 8-shaped linked coils have two sides across which one coil straddles out of three sides in three slots over which one set of the linked coils straddles overlapping on other two sides across which another coil straddles out of three sides of another set of the figure 8-shaped linked coils, directions of current flow of the two sides and the other two sides being aligned, so that the two sets of the figure 8-shaped linked coils are linked while sharing two slots, thereby connecting the plurality of sets of the figure 8-shaped linked coils in series.

5 . The three-phase alternating current motor according to claim 4 , comprising linked coils that have, out of two coils configuring the figure 8-shaped linked coils, one coil having a number of windings different from that of another coil.

6 . A method for manufacturing a three-phase alternating current motor comprising figure 8-shaped linked coils by using an inserter type automatic winding machine that is equipped with a nozzle rotating while releasing windings and has two or more parallel winding frames around which the windings are wound to produce coils, the method comprising:
a first step of adjusting heights of the two winding frames and rotating the nozzle around one of the winding frames by a predetermined number of windings to produce a first coil; a second step of adjusting the heights of the two winding frames and rotating the nozzle around another of the winding frames by a predetermined number of windings in a direction opposite to the rotation direction to produce a second coil having a current direction opposite to that of the first coil; a third step of inserting the two coils into an inserter in such a manner that one overlapping side of the two coils is inserted into one slot; a fourth step of repeating the first step to the third step to produce other figure 8-shaped linked coils and thus produced linked coils are inserted into the inserter; and a fifth step of inserting the inserter into a stator, thereby inserting all the windings into the stator.

7 . A method for manufacturing a three-phase alternating current motor comprising figure 8-shaped linked coils by using an inserter type automatic winding machine that is equipped with a nozzle rotating while releasing windings and has three parallel winding frames around which the windings are wound to produce coils, the method comprising:
a first step of adjusting heights of the three winding frames and rotating the nozzle around a first winding frame by a predetermined number of windings to produce a first coil; a second step of adjusting the heights of the three winding frames and rotating the nozzle around a second winding frame by a predetermined number of windings in a direction opposite to the rotation direction to produce a second coil having a current direction opposite to that of the first coil; a third step of adjusting the heights of the three winding frames and rotating the nozzle around a third winding frame in a direction opposite to the rotation direction of the second coil to produce a third coil having a current direction opposite to that of the second coil; a fourth step of simultaneously inserting the three coils into an inserter in such a manner that one overlapping side of the first and second coils and another overlapping side of the second and third coils are each inserted into each one slot; a fifth step of repeating the first step to the fourth step to produce other figure 8-shaped linked coils using the two or three winding frames and thus produced linked coils are inserted into the inserter; and a sixth step of inserting the inserter into a stator, thereby inserting all the windings into the stator.

Assignees

• Fanuc Corp

Inventors

• Ito Takashi

Classifications

• H02K15/0431

  Concentrated windings · CPC title

• H02K3/28 Primary

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title

• H02K15/024

  Electricity · mapped topic

• H02K1/16

  Stator cores with slots for windings · CPC title

• H02K3/12

  arranged in slots · CPC title