JP2502641B2 - Electric motor stator core - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a stator core of an electric motor used for driving a fan of home electric appliances and the like.

2. Description of the Related Art Conventionally, a stator core of an electric motor of this type has a structure generally shown in FIGS. 4 and 5. That is, as a method for facilitating coil winding, the tooth core 110 has a plurality of teeth 112 arranged radially outside the rotor hole 111 into which a rotor (not shown) is inserted, and each tooth 112 is It is connected to the outer circumference of the rotor hole 111 by a bridging portion 113 and is adjacent to the tooth 112.
A slot 114, which is a space around which a coil (not shown) is wound, is formed between 112. A protrusion 115 protruding laterally is provided on the outer periphery of the tooth 112, and an opening 116 for winding a coil around a slot 114 is formed between the protrusion 115 and an adjacent protrusion 115. Reference numeral 117 denotes an annular yoke core, and a protrusion 118 is provided on the inner peripheral side of the yoke iron core 117. After the coil is wound around the slot 114 through the opening 116, the protrusion 118 is formed.
Was press-fitted into the opening 116 to form a yoke stator.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In such a conventional configuration, the winding of the coil is performed by the tooth core.
Although the efficiency of the coil winding work is improved because it is performed from the outside of 110, since the teeth 112 and the teeth 112 of the tooth core 110 are connected by the bridging portion 113, the magnetic flux generated by the coil is generated. Although torque flows from the teeth 112 to the rotor, a part of the generated magnetic flux is short-circuited through the bridging portion 113 of the teeth 112 and does not pass through the rotor. This short-circuited magnetic flux does not contribute to the generation of torque, so it becomes an invalid magnetic flux, and the exciting current for generating this magnetic flux becomes a loss, reducing the efficiency of the motor and causing vibration and noise due to the short-circuit current. There was a problem.

The present invention solves such a problem, and improves the efficiency of the electric motor by maintaining a mechanical function as a connecting portion that connects adjacent teeth and significantly reducing a magnetic flux that short-circuits. And a stator core capable of reducing vibration and noise.

Means for Solving the Problem In order to solve this problem, the present invention provides a tooth core having a plurality of teeth radially provided on the outer circumference of a rotor hole, and a magnetic member fitted to the outer circumference of the tooth core. In a stator core of a motor having a two-phase winding of a type that is divided into a yoke core that forms a path, the tooth core has an opening and a slot for winding winding on the outer peripheral side of all slots. There is a non-bridged portion at the position where the inner diameter of the tooth core is evenly divided into the same number as the number of poles, and all other inner circumferences of the slots are laminated with bridged core plates. Approximately 1/2 of the total number of iron core plates with one non-bridged portion per pole of the same coil on the inner peripheral side of the slot in which the A phase coil is housed, and the B phase coil Of a slot different from the slot provided with the non-bridge portion for the A-phase coil. On the inner circumference side, there is one non-bridged part per pole of the same coil in a position that divides the entire circumference equally. It is a thing.

Operation With this configuration, the non-bridge portion on the inner peripheral side of the slot that houses the A-phase coil (or B-phase coil) significantly reduces the magnetic flux leakage between the A-phase coil (or B-phase coil) poles. In addition, since the magnetic resistances of the magnetic fluxes generated by the A-phase coil and the B-phase coil are the same in the magnetic path, it is easy to make the magnetomotive forces of the coils of the respective phases the same, and therefore, the magnetic poles of the magnetic fluxes It is possible to reduce vibration and noise due to leakage and imbalance of magnetomotive force of each phase. In addition, the tooth core has the same number of non-bridging portions as the number of poles in the slot inner circumference, and all other slot inner circumferences are laminated only with bridging core plates. The iron core can be integrated. Further, since the tooth core is composed of only the core plate having the bridging part, it is not necessary to reduce the width of the bridging part to the limit of punching the core, so that problems such as damage to the press die are reduced. be able to.

Embodiments Embodiments of the present invention will be described below with reference to FIGS.

In FIGS. 1 to 3, a plurality of teeth 2 are radially arranged on the outer periphery of a rotor hole 1 into which a rotor (not shown) is inserted, and an electric motor is provided at inner peripheral edges of adjacent teeth 2. Of non-bridging portions 3'of the same number as the number of poles of the non-bridging portion 3'of the tooth portion iron core 5 at the position equally dividing the inner circumference of the tooth core 5 and the non-bridging portion 3'of the iron core plate 4 ' The tooth core 5 is formed by laminating an arbitrary number of iron core plates 4 ″ each having a non-bridge portion 3 ″. Between adjacent teeth 2, a slot 6 which is a space around which a coil (not shown) is wound is formed, and a projection 7 is provided on the outer circumference of the tooth 2.
An opening 8 for winding a coil around the slot 6 is formed between the protrusions 7. Reference numeral 9 denotes an annular yoke core, which is provided with a convex portion 10 on the inner peripheral side of the yoke core 9 and is press-fitted into the opening 8. Then, after winding the coil around the slot 8 through the opening 8, the yoke core 9 is press-fitted to form a stator core.

FIG. 2 is a development view of the stator core around which the coil is wound as seen from the inner peripheral side. The A-phase coil 11 and the B-phase coil 12
It shows an example in which coils of a phase motor are arranged. In FIG. 1, the tooth core 5 has an iron core plate 4'having as many non-bridged portions 3'as the number of poles and a non-bridged portion 3'of the iron core plate 4 ', which are displaced by two slots. The number of poles is the same as that of the iron core plates 4 "having the same number of non-bridge portions 3", and the number of sheets is about 1/2 of the total number.

In the above structure, the current flows through the A-phase coil 11 and the magnetic flux generated in the iron core plate 4'is magnetically separated from the adjacent pole by the non-bridge portion 3 ', and the magnetic flux generated in the iron core plate 4 "by the B-phase coil 12 is generated. Is magnetically separated from the phosphorus pole by the non-bridge portion 3 ″, so that the short-circuiting magnetic flux, that is, the leakage magnetic flux is greatly reduced.

In addition, the inner peripheral edge of the tooth core 5 formed by stacking a plurality of iron core plates 4'and 1/2 "each of the iron core plates 4" is connected by bridging parts other than the non-bridging parts 3'and 3 ". Will be retained.

As described above, according to the present embodiment, the tooth core 5 has the core plate 4'having the non-bridge portions 3'of several poles and the non-bridge portion 3 of several poles at a position different by two slots. Since the iron core plates 4 ″ having “″ are combined and laminated, the iron core plates 4 ′ are mechanically firmly connected to the iron core plates 4 ″ and integrally held, and the leakage of magnetic flux can be significantly reduced.

Further, one non-bridge portion 3'and 3 "for each pole of the A-phase coil 11 and the B-phase coil 12 are equally divided on the inner circumference of the tooth core 5, and the iron core plates 4'and 4" are almost the same. Since the same number of sheets are laminated, the magnetic resistances of the magnetic circuits of the respective poles of the respective phases are the same, and the magnetomotive forces of the respective phases can be easily balanced.

Further, since the tooth cores 5 are all composed of the core plates 4 ', 4 "having the non-bridging portions 3', 3", it is not necessary to reduce the width of the bridging portions to the core punchable limit. It is possible to reduce mold troubles.

In the embodiment, the stator having two poles and eight slots and the show pitch winding is used. However, the stator can be applied to any number of poles and the number of slots is not different.

EFFECTS OF THE INVENTION As is apparent from the above description of the embodiments, according to the present invention, an iron core plate having a number of pole non-bridge portions at positions that equally divide the inner circumference of the tooth core, and a non-bridge Maintaining the mechanical function as a connecting part that connects adjacent teeth firmly and integrally holds them by constructing the tooth core by changing the entanglement part by 2 slots and stacking it by about 1/2 each. At the same time, the magnetic flux that short-circuits can be greatly reduced, the exciting current can be greatly reduced, and the efficiency of the motor can be improved, and the vibration and noise due to the imbalance and saturation of the magnetic flux of each phase pole can be greatly reduced. And the effect of reducing troubles in the core punching process.

[Brief description of drawings]

FIG. 1 is a plan view of a tooth portion of a stator core according to an embodiment of the present invention, FIG. 2 is a development view seen from an inner peripheral side of a stator core around which a coil is wound, and FIG. 3 is a plan view of the same. FIG. 4 is a plan view of a tooth portion of a conventional stator core, and FIG. 5 is a plan view of the yoke portion. 1 ... Rotor hole, 2 ... Tooth, 3 ', 3 "... Non-bridged part,
4 '... 3' iron core plate, 4 "... 3" iron core plate, 5 ... tooth core, 9 ... yoke core, 11 ... A phase coil, 12 ... B phase coil .

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Open 61-62537 (JP, U) Open 55-35831 (JP, U) Open 56-158649 (JP, U) Open 59- 138371 (JP, U) Actually opened Sho 57-139245 (JP, U)

Claims (1)

(57) [Claims] 1. A tooth part core having a plurality of teeth radially provided on the outer periphery of a rotor hole, and a yoke part core fitted to the outer periphery of the tooth part core to form a magnetic path. Format 2
In a stator core of a motor having a phase winding, the tooth core is divided into an opening for winding winding on the outer peripheral side of all slots and an inner diameter of the tooth core on the inner peripheral side of the slots equal to the number of poles. A non-bridging portion is provided at the position, and the other inner circumference side of the slot is formed by stacking bridged iron core plates. Further, the tooth core has the same coil 1 on the inner circumference side of the slot in which the A-phase coil is housed. Approximately 1/2 of the total number of iron core plates with one non-bridging portion per pole at positions that evenly divide the entire circumference, and a slot that accommodates the B-phase coil. On the inner peripheral side of the slot different from the slot in which the part is provided, there is one non-bridged part per pole of the same coil in a position that divides the entire circumference equally The stator core of the electric motor is made up of a rigidly integrated structure.