Electric motor and method for winding electric motor winding wire

Patent metadata

Field	Value
Publication number	US-9608487-B2
Application number	US-201214350454-A
Country	US
Kind code	B2
Filing date	Oct 17, 2012
Priority date	Oct 18, 2011
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A winding wire ( 14 ) includes a first coil ( 15 ) formed by being wound N/2+α times between two predetermined slots ( 13 ) present in positions which are point-symmetrical with respect to a rotating shaft, and a second coil ( 16 ) formed by being wound N/2−α times between the two predetermined slots ( 13 ) which are the same as those between which the first coil ( 15 ) is formed, when a predetermined number of turns of the winding wire ( 14 ) between the predetermined slots is N.

First claim

The invention claimed is:

1. An electric motor comprising:
a rotating shaft rotatably supported by a yoke;
an armature core attached to the rotating shaft and including a plurality of teeth extending radially to be in a diameter direction and a plurality of slots formed between these teeth;
a winding wire wound between the slots; and
a commutator adjacent to the armature core in the rotating shaft and including a plurality of segments to which the winding wire is connected,
wherein, when a predetermined number of turns of the winding wire between the slots is N, A is an integer equal to or more than 0, and α is set to satisfy α=0.5 A,
the winding wire includes a first coil including a first small coil and a second small coil, and a second coil including a third small coil and a fourth small coil,
the first small coil is formed by the winding wire being wound N/2+α times between two predetermined slots,
the second small coil is formed by the winding wire being wound N/2−α times between two other slots present in positions which are point-symmetrical to the two predetermined slots with respect to the rotating shaft,
the third small coil is formed by the winding wire being wound N/2+α times between the two other slots which are the same as those between which the second small coil is formed, and
the fourth small coil is formed by the winding wire being wound N/2−α times between the two predetermined slots which are the same as those between which the first small coil is formed.

2. The electric motor according to claim 1 , wherein:
a winding start end and a winding termination end of the winding wire forming the first coil are connected to respective predetermined segments, and
a winding start end and a winding termination end of the winding wire forming the second coil are connected to the respective predetermined segments.

3. The electric motor according to claim 2 , wherein a crossover wire of the winding wire crossing between the two predetermined slots is wired in an axial end portion on the opposite side from the commutator of the armature core.

4. The electric motor according to claim 2 or 3 , wherein the winding wire forming the first coil and the winding wire forming the second coil are separate winding wires.

5. A method for winding a winding wire of an electric motor which comprises:
a rotating shaft rotatably supported by a yoke;
an armature core attached to the rotating shaft and including a plurality of teeth extending radially to be in a diameter direction and a plurality of slots formed between these teeth;
a winding wire wound between the slots; and
a commutator adjacent to the armature core in the rotating shaft and including a plurality of segments to which the winding wire is connected,
the method comprising:
when a predetermined number of turns of the winding wire between the slots is N, A is an integer equal to or more than 0, and α is set to satisfy α=0.5 A,
forming a first coil including a first small coil and a second small coil, and a second coil including a third small coil and a fourth small coil,
forming the first small coil by continuously winding the winding wire N/2+α times between two predetermined slots,
forming the second small coil by continuously winding the winding wire N/2−α times between two other slots present in positions which are point-symmetrical with respect to the rotating shaft,
forming the third small coil by continuously winding the winding wire N/2+α times between the two other slots which are the same as those between which the second small coil is formed,
forming the fourth small coil by continuously winding the winding wire N/2−α times between the two predetermined slots from on the first small coil, and
winding the first coil and the second coil at the same time.

6. The method of claim 5 wherein the first coil is wound using a first flyer that produces a first tension, and the second coil is wound using a second flyer that produces a second tension.

Assignees

• Mitsuba Corp

Inventors

• Sakata Kenji
• Hoshino Akio

Classifications

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K23/30

  having lap or loop 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

• H02K3/12

  arranged in slots · CPC title

• H02K15/045

  Electricity · mapped topic