JP2000139063A - Permanent magnet type synchronous electric rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet type synchronous electric rotating machine capable of skewing its magnetic field side (permanent magnet side) and improving ease of assembly. SOLUTION: This synchronous electric rotating machine is provided with silicon steel plates 11, each of which is formed with a slit for a permanent magnet 12 as well as a slit 13 between magnets and a slit between iron cores 14, so that their relative positions in the circumferential direction may be deviated by a skew-equivalent angle corresponding to the direction of the accumulation thickness of a laminated core 16. The silicon steel plates 11 are formed in a layered manner so that the shape of a slit for permanent magnet 18 constituted of the slits for permanent magnet may be in parallel to the axial direction, the shape of a slot between magnets 19 constituted of the slits between magnets may be in parallel to the axial direction, and the shape of a slot 17 between iron cores constituted of the slits between iron cores may form a skew slot. Each of the silicon steel plates is formed with a slit 31 for braking winding so that the relative position in the circumferential direction may be deviated from the slit between magnets, by a skew-equivalent angle corresponding to the direction of the accumulation thickness of a laminated core, and the silicon steel plates are formed in a layered manner so that a slot 32 for braking winding constituted of the slits for damper winding may become a skew slot.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet type synchronous rotating electric machine, and more particularly to a permanent magnet type synchronous rotating electric machine having improved assemblability.

[0002]

2. Description of the Related Art At present, attention has been paid to a synchronous motor using a permanent magnet as a field source because of its energy saving effect as compared with an induction motor. However, if the synchronous motor has a slot for winding, torque ripple is generated due to the magnetic attraction generated at the edge of the iron core.

Therefore, in the conventional permanent magnet type synchronous motor, in order to improve the torque characteristics, the slots of the windings on the stator side are inclined while being twisted by one slot pitch, that is, skewed. Oblique slots). In this case, since it is sufficient that the stator side (armature side) and the rotor side (field side) are relatively inclined, it is sufficient to skew only one of the stator side and the rotor side. Has skewed the slots on the stator side for the following reasons.

As shown in FIG. 6, in the induction motor, since the secondary conductor 1 inserted into the slot 3 of the iron core 2 on the rotor side is made of aluminum or copper having good flexibility, the slot 3 is formed at a pitch of one slot. The secondary conductor 1 can be easily inserted into the slot 3 even if the skew is made by a minute.

On the other hand, as shown in FIG. 7, in a permanent magnet type synchronous motor in which a permanent magnet 6 serving as a field source is embedded in an iron core 4 on the rotor side through a slot 7 between magnets, a slot on the rotor side is used. 5 is skewed, and the permanent magnet 6 is embedded in the skew slot 5.
The shape itself must be twisted and complicated. However, when the permanent magnet 6 itself is formed into a complicated twisted shape, a complicated jig is required for polishing the permanent magnet 6, and the polishing time is increased, so that the cost is increased. Further, it is difficult to insert the permanent magnet 6 having such a complicated shape into the skew slot 5.

Therefore, in the conventional permanent magnet type synchronous motor, the slot of the winding on the stator side is skewed as described above.

[0007]

However, when the slots of the windings on the stator side are skewed as described above, the space factor of the windings is reduced, and when the windings are inserted into the slots. Since the winding insertion machine cannot be used, the winding insertion work must be performed manually, and it takes time to assemble the motor.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a permanent magnet type synchronous rotating electric machine which can skew the field side (permanent magnet side) and improve the assemblability in view of the above prior art.

[0009]

Means for Solving the Problems A first method for solving the above problems is described below.
In the permanent magnet type synchronous rotating electric machine of the invention, a permanent magnet slit for inserting a permanent magnet serving as a field source is formed in each of the iron plates constituting the layered core on the field side, and the permanent magnet portion is formed. A magnet slit for magnetically insulating between the magnetic poles of the laminated core, and an inter-core slit for separating between the magnetic poles of an iron core portion facing the gap between the field side and the armature side, the stacking direction of the laminated core. These iron plates are formed by shifting the relative positions in the circumferential direction by an angle corresponding to the skew, and the shape of the permanent magnet slots formed by the permanent magnet slits is substantially parallel to the axial direction. The shape of the slot between magnets formed by the slit is also substantially parallel to the axial direction, and the shape of the slot between the iron cores formed by the slit between the iron cores is configured to be stacked so as to be a skew slot. And butterflies.

A permanent magnet type synchronous rotating electric machine according to a second aspect of the present invention is the permanent magnet type synchronous rotating electric machine according to the first aspect of the present invention, wherein each of the iron plates has a braking winding slit for providing a braking winding. The relative position in the circumferential direction is shifted by an angle corresponding to the skew corresponding to the stacking direction of the laminated iron core with respect to the inter-slit, and these iron plates are formed in the braking winding slot formed by the braking winding slit. It is characterized in that the configuration is such that the shape is also stacked so as to be a skew slot.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

[First Embodiment] FIG. 1 is an explanatory view of a silicon steel plate constituting a laminated core on a rotor side in a permanent magnet type synchronous motor according to a first embodiment of the present invention, and FIG. 2 is an explanation of the laminated iron core. FIG.

<Structure> As shown in FIGS. 1A and 1B, a silicon steel plate 11 is provided with a permanent magnet slit 12 for inserting a permanent magnet 15 and a magnetic field between the magnetic poles of the permanent magnet portion. An inter-magnet slit 13 for insulation and an inter-core slit 1 for separating magnetic poles of an iron core portion facing a gap between a field side (rotor side) and an armature side (stator side).
4 is the circumferential direction of the silicon steel sheet (hereinafter simply referred to as the circumferential direction)
In the case of a four-pole motor at predetermined intervals, four portions are formed (only one portion is shown in FIG. 1).

The inter-magnet slit 13 is formed such that its circumferential width is equal to or greater than one slot pitch p of the stator-side winding (not shown). Specifically, the magnet inter-magnet slit 13 is formed by two straight lines having both ends in the circumferential direction of the magnet inter-magnet slit 13 drawn from the center o of the silicon steel plate 11 to two adjacent winding slots on the stator side (not shown). It is formed so as to be located on the outer side in the circumferential direction than a and b.

The permanent magnet slits 12 are formed on both circumferential sides of the inter-magnet slit 13. These permanent magnet slits 12 are shaped so that permanent magnets 15 parallel to the axial direction can be inserted. The slit 14 between the iron cores extends from the vicinity of the slit 13 between the magnets to the silicon steel plate 11.
Extends toward the outer peripheral surface of the.

As shown in FIG. 2, a large number of silicon steel plates 11 are stacked in the direction of the rotation axis of the rotor (hereinafter, simply referred to as the axial direction) to form a laminated iron core 16 on the rotor side. Each silicon steel plate 11 is provided with a slit 13 between magnets and a slit 14 between iron cores,
The relative positions in the circumferential direction are shifted by an angle corresponding to the skew corresponding to the stacking direction of the silicon steel plates 11.
The shape of the slots for permanent magnets 18 formed by the slits 12 for permanent magnets is parallel to the axial direction, the shape of the slots 19 for magnets formed by the slits 13 between the magnets is also parallel to the axial direction, and the slits 14 between the iron cores are formed. The slots 17 between the iron cores are stacked so as to be skew slots.

That is, as illustrated in three places in FIG. 2, in the silicon steel plate 11 located at one axial end of the laminated iron core 16, the slit 14 between the iron cores is provided at the left end in the circumferential direction of the slit 13 between the magnets.
In the silicon steel plate 11 located at the axial center of the laminated core 16, the inter-core slit 14 is located at the circumferential center of the inter-magnet slit 13, and the silicon steel plate 11 is located at the other axial end of the laminated core 16. In the raw steel plate 11, the slit 14 between the iron cores is located at the right end in the circumferential direction of the slit 13 between the magnets. Therefore, if the silicon steel plates 11 are laminated so that the inter-magnet slots 19 formed by the inter-magnet slits 13 become the inter-magnet slots 19 parallel to the axial direction, the inter-core slits 14 are formed.
The core-to-iron slot 17 formed by this is inclined while twisting to form a skew slot. Further, the slot 19 between magnets and the slot 17 between iron cores are always connected.

The slit 13 between the magnets and the slit 14 between the iron cores are provided for each silicon steel plate 11.
In order to shift the relative position in the circumferential direction by an angle corresponding to the skew corresponding to the stacking direction of No. 6, a die for forming the slits 12, 13, and 14 by pressing the silicon steel plate 11 is shown in FIG. c) The die 21 for the slit between the iron cores shown by the one-dot chain line and the die 22 for the slit between the magnets and the slit for the permanent magnets shown by the two-dot chain line are separated, and the die for each silicon steel plate 11 is separated. The press position by the die 21 and the press position by the die 22 may be pressed by shifting the relative position in the circumferential direction by an angle corresponding to the skew corresponding to the stacking direction of the laminated core 16.

Further, when the silicon steel plates 11 are laminated, the silicon steel plates 11 are actually aligned while the silicon steel plates 11 are not removed (that is, only by forming the slits 12, 13 and 14). If the silicon steel plates 11 are provided with positioning grooves (slits) in each silicon steel plate 11 or if the silicon steel plates 11 are not separated by using a caulking mold or the like, lamination of the silicon steel plates 11 becomes easy. .

<Operation / Effect> As described above, according to the permanent magnet type synchronous motor according to the first embodiment, each of the silicon steel plates 11 constituting the laminated iron core 16 on the rotor side (field side) is provided. Are formed slits 12 for permanent magnets for inserting permanent magnets 15 serving as field sources, slits 13 between magnets for magnetically insulating between magnetic poles of the permanent magnet portion, and a rotor side (field side). And stator side (armature side)
And a core-to-core slit 14 for separating the magnetic poles of the core portion facing the gap by shifting the relative position in the circumferential direction by an equivalent skew angle corresponding to the stacking direction of the laminated core 16. In the silicon steel plate 11, the shape of the permanent magnet slots 18 formed by the permanent magnet slits 12 is parallel to the axial direction, and the shape of the inter-magnet slots 19 formed by the inter-magnet slits 13 is also parallel to the axial direction. Since the shape of the slot 17 between the iron cores formed by the slit 14 between the iron cores is a configuration laminated so as to be a skew slot, the magnetic pole on the field side can be skewed without skewing the slot 12 for the permanent magnet. In addition, the torque characteristics can be improved.

Since the permanent magnet 15 inserted into the permanent magnet slot 12 can have a simple shape parallel to the axial direction, it can be easily polished in a short time.
Further, it can be easily inserted into the permanent magnet slot 12. That is, the assemblability is improved. Moreover, since skew can be easily applied to the rotor side (field side),
There is no need to skew the stator side (armature side).
For this reason, the winding work on the stator side can be easily performed using a machine such as a winding insertion machine, and the cost can be reduced.

The permanent magnet 15 is tile-shaped, but is not limited to this. The shape of the permanent magnet 15 may be any shape as long as it is parallel to the axial direction such as a rectangular parallelepiped. Is also good. In this case, of course, the shape of the permanent magnet slit 12 is also made to be a shape corresponding to the shape of the permanent magnet 15.

Further, the shape of the inter-magnet slit 13 may be appropriately changed as illustrated in FIGS. In FIG. 3, the shape of the slit 13 between magnets is round. This is an example in which a rod for tightening the laminated core is easily inserted into the slit 13 between the magnets (that is, the slot 19 between the magnets). In FIG. 4, the width of the inter-magnet slit 13 in the radial direction of the silicon steel plate (hereinafter simply referred to as the radial direction) is made smaller than the radial width of the permanent magnet slit 12, thereby positioning the permanent magnet 15 in the circumferential direction. Is easy.

In these examples, the slit 1 between the iron cores is used.
As shown in FIGS. 3C and 4C, the silicon steel sheet 4 is formed by punching the silicon steel sheet 11 up to the gap portion with the die 21. Of course, the slit 14 between the iron cores shown in FIG.
Similarly, they may be formed by punching up to the gap. However, it is necessary to secure a bridge portion 23 connecting the inner peripheral portion and the outer peripheral portion of the permanent magnet 14. If the bridge portion 23 is omitted, the silicon steel plate 11 separates into an inner peripheral portion and an outer peripheral portion of the permanent magnet 14.

[Embodiment 2] When a braking winding is applied, it is preferable that the braking winding also has a skew effect. Therefore, here, a case where the braking winding is skewed will be described with reference to FIG. FIG. 5 is an explanatory diagram of a laminated core on the rotor side in the permanent magnet type synchronous motor according to Embodiment 2 of the present invention.

<Structure> As shown in FIG. 5, in the second embodiment, in order to provide a braking winding 33 on the peripheral portion of each silicon steel plate 11, a round braking winding slit 31 is provided.
Are formed. These braking winding slits 31
Also, the relative position in the circumferential direction is shifted by an angle corresponding to the skew corresponding to the stacking direction of the laminated iron core 16 with respect to the inter-magnet slit 13, and the silicon steel plate 11 has a slit 31 for the braking winding. The shape of the braking winding slot 32 is also stacked so as to be a skew slot. The braking winding slot 32 is skewed at least one slot pitch p (see FIG. 4) of a stator-side winding (not shown).

Both ends in the axial direction of the braking winding 33 provided in the braking winding slot 32 are connected by a short-circuit ring (not shown). The braking winding 33 is formed by inserting a conductor made of a flexible material such as aluminum or copper into the braking winding slot 32 or by die-casting aluminum or the like into the braking winding slot 32. You.

The other configuration is the same as that of the first embodiment, and the detailed description is omitted here.

<Operation / Effect> As described above, according to the permanent magnet type synchronous motor according to the second embodiment, each silicon steel plate 11 is provided with a braking winding 31 for providing a braking winding 31. The slit 31 is also formed by shifting the relative position in the circumferential direction with respect to the inter-magnet slit 13 by an angle corresponding to the skew corresponding to the stacking direction of the laminated iron core 16.
1 are laminated so that the shape of the braking winding slot 32 formed by the braking winding slit 31 also becomes a skew slot, so that the torque characteristics of the braking winding 31 are also improved.

Further, as the braking winding 33, a conductor made of a flexible material such as aluminum or copper is inserted into the braking winding slot 32, or aluminum or the like is die-cast into the braking winding slot 32. Therefore, even if the brake winding slot 32 is skewed, there is little operational trouble.

As is clear from the above description, the slit here is not limited to an elongated shape, but may be a hole or a cut having an appropriate shape such as a round shape or a square shape. The configured holes and grooves.

[0032]

As described above in detail with the embodiments of the present invention, according to the permanent magnet type synchronous rotating electric machine of the first invention, each iron plate constituting the layered core on the field side has: In addition to forming a permanent magnet slit for inserting a permanent magnet serving as a field source, a slit between magnets for magnetically insulating between the magnetic poles of the permanent magnet portion, and a gap between the field side and the armature side. A slit between the cores for separating the magnetic poles of the core portions facing each other is formed by shifting the relative position in the circumferential direction by an angle corresponding to the skew corresponding to the stacking direction of the laminated core, and these iron plates are formed by the permanent The shape of the slots for permanent magnets formed by the magnet slits is substantially parallel to the axial direction, and the shape of the slots for magnets formed by the slits for the magnets is also substantially parallel to the axial direction. Since the shape of the slots between the iron cores is stacked so as to be skew slots, the magnetic poles on the field side can be skewed without skewing the slots for permanent magnets, and the torque characteristics can be improved. .

Since the permanent magnet inserted into the permanent magnet slot can have a simple shape substantially parallel to the axial direction, it can be easily polished in a short time, and can be easily removed. It can be inserted into a slot. That is, the assemblability is improved. In addition, since the skew can be easily applied to the field side, it is not necessary to apply the skew to the armature side. For this reason, the winding work on the armature side can be easily performed by using a machine such as a winding insertion machine, and the cost can be reduced.

Further, according to the permanent magnet type synchronous rotating electric machine of the second invention, in the permanent magnet type synchronous rotating electric machine of the first invention, each iron plate has a slit for a braking winding for providing a braking winding. The relative position in the circumferential direction is shifted by an angle corresponding to the skew corresponding to the stacking direction of the laminated core with respect to the inter-magnet slit, and these iron plates are formed for the braking winding formed by the braking winding slit. Since the slots are stacked so as to form skew slots, torque characteristics in the brake winding are also improved.

Moreover, the braking winding is formed by inserting a conductor made of a material having good flexibility such as aluminum or copper into the braking winding slot or by die-casting aluminum or the like into the braking winding slot. Therefore, even if the slot for the brake winding is skewed, there is little operational trouble.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a silicon steel plate constituting a laminated core on the rotor side in a permanent magnet synchronous motor according to Embodiment 1 of the present invention.

FIG. 2 is an explanatory diagram of the laminated core.

FIG. 3 is an explanatory view showing another example of the inter-magnet slit formed in the silicon steel plate.

FIG. 4 is an explanatory view showing another example of the inter-magnet slit formed in the silicon steel plate.

FIG. 5 is an explanatory diagram of a laminated core on the rotor side in the permanent magnet synchronous motor according to Embodiment 2 of the present invention.

FIG. 6 is an explanatory diagram of a skew slot in the induction motor.

FIG. 7 is an explanatory view of a skew slot in a conventional permanent magnet synchronous motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Silicon steel plate 12 Slit for permanent magnets 13 Slit between magnets 14 Slit between iron cores 15 Permanent magnet 16 Layered iron core 17 Slot between iron cores 18 Slot for permanent magnets 19 Slot between magnets 31 Slit for braking winding 32 Slot for braking winding 33 Braking Winding

Continued on the front page F term (reference) 5H002 AA04 AB05 AB07 AC06 AD04 AE06 AE08 5H615 AA01 BB01 BB07 BB14 BB16 PP03 PP09 SS05 SS19 SS44 SS51 TT05 5H621 AA02 BB07 GA01 GA04 HH10 JK02 JK05 5H622 AA07 CA10 CA03 CA02 QB03 QB05

Claims (2)

[Claims] 1. A permanent magnet slit for inserting a permanent magnet serving as a field source is formed in each iron plate constituting a layered core on the field side, and a magnetic gap between the magnetic poles of the permanent magnet portion is formed. A slit between magnets for insulation and a slit between cores for separating between magnetic poles of an iron core portion facing a gap between a field side and an armature side correspond to a skew corresponding to a stacking direction of the laminated core. These iron plates are formed by shifting the relative positions in the circumferential direction by an angle, and the shape of the permanent magnet slots formed by the permanent magnet slits is substantially parallel to the axial direction, and the magnets formed by the magnet-to-magnet slits The shape of the slot between the cores is also substantially parallel to the axial direction, and the shape of the slot between the iron cores formed by the slit between the iron cores is a configuration in which the slots are stacked so as to be skew slots. Synchronous rotating electric machine. 2. The permanent magnet type synchronous rotating electric machine according to claim 1, wherein each of the iron plates is provided with a braking winding slit for providing a braking winding, and a lamination of the laminated core with respect to the inter-magnet slit. The iron plates are formed by shifting the relative position in the circumferential direction by the skew equivalent angle according to the thickness direction, and these iron plates are laminated such that the shape of the braking winding slot formed by the braking winding slit also becomes the skew slot. A permanent magnet type synchronous rotating electric machine having a configuration.