JP2011244674A - Split stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a split stator capable of avoiding a deterioration in electromagnetic performance and a complication of an assembling process thereof.SOLUTION: As a constitution of a split stator, the split stator includes: an annular yoke section; a plurality of teeth joined to a radially inner end of the yoke section; and windings wound around the plurality of teeth by a distributed winding method. Further, it is employed such a constitution for the split stator that the yoke section is formed of non-oriented electrical steel sheets and that each of the plurality of the teeth is formed of oriented electrical steel sheets having an easy axis of magnetization lying in the same direction as a flow direction of magnetic flux.

Description

 The present invention relates to a split stator.

  In recent years, concentrated winding type synchronous magnet synchronous motors (IPM motors) are often used as motors of several kW class mounted on home appliances and the like. On the other hand, in a high-power IPM motor of several tens of kW class or more, when a concentrated winding method is adopted, in principle, harmonic components are superimposed on the current magnetic field of the stator, and the eddy current of the rotor in which the magnet is embedded is large. Therefore, a distributed winding method in which a harmonic component is not superimposed on the stator current magnetic field tends to be employed.

  Further, in recent years, not only IPM motors but also split stators that can improve the winding space factor and motor efficiency by changing the stator core from a conventional integral core to a split core. It has become mainstream. For example, in Patent Documents 1 to 3 below, a split type in which the stator core is divided into an annular yoke portion and a plurality of teeth portions, and the yoke portion is further divided into a plurality of yoke pieces along the circumferential direction. A stator is disclosed.

JP-A-7-67272 JP 2003-274583 A JP 2006-325296 A

  As a conventional split type stator, like the split type stator disclosed in Patent Documents 1 to 3, the yoke part is divided into a plurality of yoke pieces, and a grain-oriented electrical steel sheet is used for forming the yoke part and the teeth part. In addition to the type, a non-oriented electrical steel sheet is used to form the yoke part, a directional electrical steel sheet is used to form the tooth part, and a directional electrical steel sheet is used to form the yoke part, and the tooth part is not oriented. And the like using a conductive electromagnetic steel sheet.

  What is common to these types of split stators is that the yoke portion is divided into a plurality of yoke pieces, and therefore the magnetic resistance is increased due to the effect of a gap (gap) generated at the joint portion between adjacent yoke pieces. In addition to a decrease in electromagnetic performance, there is a problem that the assembly process of the split stator is complicated.

 The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a split stator that can avoid a decrease in electromagnetic performance and a complicated assembly process.

  In order to solve the above-described problem, in the present invention, as a solving means related to a split stator, an annular yoke portion, a plurality of teeth portions joined radially inward of the yoke portion, and the teeth portion And the yoke portion is formed using a non-oriented electrical steel sheet, and each of the teeth portions has an easy magnetization direction that coincides with the flow direction of the magnetic flux. It is formed using a grain-oriented electrical steel sheet.

 According to the split stator according to the present invention, since one integral yoke portion is used instead of the yoke portion divided into a plurality of yoke pieces, it is possible to avoid a decrease in electromagnetic performance and a complicated assembly process. It becomes possible.

1 is a schematic configuration diagram of a split stator 1 in the present embodiment. It is explanatory drawing regarding the modification which employ | adopted the structure which divides | segments the teeth front-end | tip part 3a from the teeth part 3, and makes this teeth front-end | tip part 3a detachable with respect to the teeth part 3. FIG. It is explanatory drawing regarding the modification which employ | adopted the structure which fills the clearance gap formed in the junction part 5 of the yoke part 2 and the teeth part 3 with the adhesive agent 6 containing a dust magnetic material.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a split stator 1 according to this embodiment. The split stator 1 in this embodiment is a split stator having a winding slot number “12” and a pole number “2”, and is joined (fitted) to the annular yoke portion 2 and radially inside the yoke portion 2. Combined 12 teeth portions 3, U-phase windings 4Ua, 4Ub, V-phase windings 4Va, 4Vb, and W-phase windings 4Wa wound around these teeth portions 3 in a distributed winding manner, 4Wb.

  The yoke portion 2 and the teeth portion 3 are divided core members formed independently by laminating electromagnetic steel plates made of silicon steel or the like, and are combined with each other to form a single stator core. In the present embodiment, the yoke part 2 is formed using a non-oriented electrical steel sheet, and each of the tooth parts 3 has an easy magnetization direction that coincides with the flow direction of magnetic flux (reference numeral D1 in FIG. 1). It is formed using a grain-oriented electrical steel sheet having (D2 in FIG. 1).

  As shown in FIG. 1, twelve tooth portions 3 are fitted into the yoke portion 2 in the radial direction at regular intervals, so that a total of twelve winding slots S1 to S12 are provided between adjacent tooth portions 3. Is formed. One U-phase winding 4Ua is distributedly wound so as to straddle the five tooth portions 3 arranged between the winding slots S1 to S6, and the other U-phase winding 4Ub Distributed winding is performed so as to straddle the five tooth portions 3 arranged between S7 and S12.

  Further, one V-phase winding 4Va is distributedly wound so as to straddle the five teeth portions 3 arranged between the winding slots S3 to S8, and the other V-phase winding 4Vb is wound around Distributed winding is performed so as to straddle the five tooth portions 3 arranged between the line slots S9 to S2. Furthermore, one W-phase winding 4Wa is distributedly wound so as to straddle the five tooth portions 3 arranged between the winding slots S5 to S10, and the other W-phase winding 4Wb Distributed winding is performed so as to straddle the five tooth portions 3 arranged between the line slots S11 to S4.

 According to the split stator 1 in the present embodiment adopting the above-described configuration, since one yoke part 2 is used instead of using a yoke part divided into a plurality of yoke pieces as in the prior art. Thus, it is possible to avoid the deterioration of electromagnetic performance and the complexity of the assembly process.

 Further, in the split stator 1 according to the present embodiment, the winding space factor can be improved by changing the stator core from the conventional integral core to the split core, and the flow of magnetic flux in the formation of the tooth portion 3 is achieved. Since the grain-oriented electrical steel sheet having the easy magnetization direction D2 that coincides with the direction D1 is used, iron loss can be reduced. Furthermore, the split stator 1 in the present embodiment employs a distributed winding method, and is optimal as a stator for a high-power IPM motor of several tens of kW class or higher.

In addition, this invention is not limited to the said embodiment, The following modifications are mentioned.
(1) In the above embodiment, the split stator 1 having the number of winding slots “12” and the number of poles “2” has been described as an example. However, this is merely an example, and the number of winding slots (the number of teeth 3) The number) and the number of poles can be appropriately changed according to the specifications required for the split stator 1.

(2) In the above embodiment, the yoke portion 2 formed by stacking non-oriented electrical steel sheets has been exemplified. However, the invention is not limited thereto, and the non-oriented electrical steel sheet is spirally wound to form a laminated structure (so-called A winding core) may be used as the yoke portion 2. Thereby, the iron loss of the yoke part 2 can be reduced, and the manufacturing yield of the yoke part 2 can be improved.

(3) As shown in FIGS. 2 (a) and 2 (b), the tooth tip 3 a may be divided from the tooth 3, and the tooth tip 3 a may be detachable from the tooth 3. In this case, the tooth portion 3 is joined to the yoke portion 2 with the teeth tip 3a removed, and the winding slots S1 to S12 are made open slots (see FIG. 2B). Assembly in which the teeth tip 3a is joined (fitted) to the teeth 3 after the U-phase windings 4Ua and 4Ub, the V-phase windings 4Va and 4Vb, and the W-phase windings 4Wa and 4Wb are mounted. The method can be employed, and the winding mounting operation can be facilitated. In addition, you may use any of a directional electrical steel plate and a non-oriented electrical steel plate for formation of this teeth front-end | tip part 3a.

(4) As shown in FIG. 3, a gap (gap) of about several hundred μm is formed in the joint part (fitting part) 5 between the yoke part 2 and the tooth part 3, and the dusting magnetic material is formed in this gap. The yoke portion 2 and the teeth portion 3 may be bonded together by filling the adhesive 6 containing This powder magnetic material is a powdered magnetic material obtained by crushing and compacting a solid magnetic material, and has the characteristics that the electrical resistance between the powders is large and the eddy current loss (iron loss) is small. is doing. That is, by filling the gap formed in the joint portion 5 with the adhesive 6 containing such a magnetic powder material, an interlayer short circuit between the yoke portion 2 and the tooth portion 3 is avoided (eddy current due to the interlayer short circuit). While avoiding the occurrence), it is possible to reduce the magnetic resistance of the joint portion 5, and as a result, it is possible to obtain the split stator 1 capable of avoiding a decrease in motor output and an increase in iron loss.

  DESCRIPTION OF SYMBOLS 1 ... Split-type stator, 2 ... Yoke part, 3 ... Teeth part, 3a ... Teeth tip part, 4Ua, 4Ub ... U phase winding, 4Va, 4Vb ... V phase winding, 4Wa, 4Wb ... W phase winding, 5 ... Junction, 6 ... Adhesive, S1 to S12 ... Winding slot

Claims (1)

An annular yoke portion;
A plurality of teeth joined to the inside of the yoke in the radial direction;
A winding wound in a distributed winding manner on the teeth part,
The yoke part is formed using a non-oriented electrical steel sheet,
Each of the teeth portions is formed using a grain-oriented electrical steel sheet having an easy magnetization direction that coincides with the flow direction of magnetic flux.

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