JPH0746044Y2 - Field structure of rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a field structure of a rotor in a rotating electric machine such as a generator or an electric motor.

(Prior Art) Conventionally, in a rotary electric machine such as a synchronous generator or a synchronous motor, in order to reduce the influence of the winding slots to shape the output waveform distortion and suppress magnetic noise and torque fluctuation, the stator or Skew is formed in the rotor core, and an example of the latter is known from Japanese Utility Model Publication No. 55-79643.

That is, the rotor core 51 shown in FIG. 5 has a key 53 (sixth part) in which a press-formed thin steel plate is obliquely fitted to the rotor shaft 52.
(Fig.) Inserting and stacking multiple sheets along the line to form skew in the magnetic pole part, and press both sides of the core holder 54, 54 '.
Fix it with the fastener 55 so that it is pinched in the axial direction by the resin, and after winding the field winding 56, fix the gap created between the field winding 56 and the rotor core 51 with resin (not shown). It is supposed to do.

(Problems to be solved by the invention) Although the conventional rotating electric machine is configured as described above, for example, when a skew is formed in the slot of the stator, the work of inserting the winding into the slot is automatically performed by a machine. However, there is a disadvantage in that the number of manual labor steps increases and the cost increases.

In addition, when the skew is formed in the magnetic pole portion of the rotor described above, the skew is also formed in the winding winding portion of the rotor core, so that the winding slips in one direction during the winding work. Can't do side-by-side winding.

Therefore, there is a problem that the coil end protrudes from the rotor core and the entire size increases.

Furthermore, since the gap length between the inner peripheral surface of the stator (not shown) and the magnetic pole term of the rotor iron core is fixed, there is a drawback that it is not possible to select arbitrary generator characteristics.

In addition, when changing the gap length, there is no other way than to correct the press die of the laminated plate or to scrape off the pole piece after the lamination, which requires a great deal of man-hours and complicated work. And

Therefore, an object of the present invention is to solve the above problems and to provide a field structure of a rotating electric machine that can easily change the generator characteristics.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a rotor for a rotatable electric machine, comprising a rotor core of a salient pole having an arcuate portion facing the inner peripheral surface of the stator. A field winding winding portion integrally formed with the rotor core is formed into a rectangular cross section perpendicular to the axis of the rotor core and a cross section parallel to the axis, and the rotor core Has an outer peripheral arc having the same radius smaller than the radius forming the inner surface of the stator and a cross section perpendicular to the axis of the rotor core formed in the same shape over the entire axial length thereof. It is characterized in that the magnetic pole arcuate portion is inclined to the rotor core by a predetermined angle with respect to the axis and is detachably fixed to the rotor core.

(Operation) When shaping the output waveform distortion of the generator in accordance with the number and length of the slots 4 on the stator 2 side, if the height of the magnetic pole arcuate portion 9 of the rotor and the curvature of the outer circumferential arc are different. Replace with another arcuate portion of the magnetic pole, and replace the gap length δ with the inner peripheral surface 3 of the stator core.
₁ and δ ₂ are selected appropriately.

In this case, the attachment angle θ of the magnetic pole arcuate portion with respect to the axis X of the rotor core 7 may also be appropriately changed according to the characteristics of the generator to be selected.

As described above, the degree of intersection between the magnetic pole arcuate portion edge and the stator-side slot 4 also changes, and the output waveform distortion is shaped in accordance with the magnetic change.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4 using a synchronous generator as an example.

Reference numeral 1 is a salient pole type synchronous generator main body, in which a slot 4 is formed in an inner circumference 3 of an iron core of a substantially annular stator 2, and a field winding 5 is wound around the slot 4.

Reference numeral 6 denotes a salient pole type rotor, the rotor core 7 is integrally formed with a field winding winding portion, and a field winding 8 is wound around the rotor core 7 and the stator is provided at an outer end portion thereof. The magnetic pole arcuate portion 9 having the inner peripheral surface 3 of the iron core and the gap lengths δ ₁ and δ ₂ (FIG. 2) of appropriate dimensions.
Is provided and is detachably fixed to the rotor core 7 by a bolt 10 to form a magnetic pole portion.

The outer circumferential arc of the magnetic pole arcuate portion 9 has a center at a position further inward than the center of the radius R forming the iron core inner circumferential surface 3 of the stator 2, and has the same radius r smaller than the radius R and ,
A cross section perpendicular to the axis of the rotor core is formed in the same shape over the entire axial length of the magnetic pole arcuate portion.

That is, the gap length δ _{2 at the} edge of the rotor side magnetic pole arcuate portion 9 facing the inner peripheral surface 3 of the stator side iron core is formed to be larger than the gap length δ ₁ at the outer edge of the center portion. The magnetic flux density in the arcuate portion of the magnetic pole changes, and functions to shape the output waveform from the rotating electric machine.

Further, as shown in FIG. 3, the magnetic pole arcuate portion 9 is fixed to the rotor iron core 7 in a state of being inclined at an angle of θ with respect to the axis x of the rotor iron core 7. The edges are arranged so as to form a skew with respect to the axis.

Further, the field winding winding portion integrally formed with the rotor iron core has a rectangular cross-sectional shape when cut perpendicularly to the axis of the iron core and a cross-sectional shape parallel to the axis. ing.

Therefore, when assembling the magnetic pole portions of the rotor, first, the magnetic pole arc upper portions 9 are fixed to the rotor core 7 with the bolts 10, respectively.
After performing a predetermined insulation treatment, the field winding 8 can be wound normally around the field winding winding portion of the rotor core to achieve accurate aligned winding, and automatic winding by a machine is also special. This can be done easily without the need for a jig for aligned winding.

If the magnetic pole arcuate portion is replaced with another magnetic pole arcuate portion having a different axial inclination angle θ corresponding to the number or shape of the slots 4 on the stator 2 side or the axial length of the rotor core, the stator can be replaced. Since the gap lengths δ ₁ and δ ₂ with the inner peripheral surface 3 of the side iron core can be changed, the characteristics of the generator can be easily changed.

In other words, in order to obtain various kinds of generators having different characteristics, the shape and dimensions of the rotor-side iron core 7 are kept constant, and the magnetic pole arcuate portion is formed according to the number or depth, shape, etc. of the slots 4 on the stator side. Since it suffices to select and combine 9 as appropriate, there is no need to prepare a working die for the stator core and the rotor core that matches the desired generator characteristics as in the conventional case.

FIG. 4 shows an example of material removal when the magnetic pole arcuate portion 9 is manufactured. A cylindrical body 11 machined with a radius r smaller than the radius R of the inner peripheral surface 3 of the stator core is shown by a dotted line a in the figure. , b, and the both end faces are dimensioned so as to match the inclination angle θ as shown in FIG. 3, and these are used as the magnetic pole arcuate portions 9 of the rotor.

In this case, the gap lengths δ ₁ , δ ₂ with the inner peripheral surface 3 of the stator core
When changing, the height h or the radius r of the arc-shaped piece 12 may be changed as appropriate, so that the machining is easy.

The rotor core 7 described above is preferably integrally formed by cutting cast iron or steel for manufacturing, but by any method such as stacking steel plates punched by a press as in the conventional method. May be made.

(Effects of the Invention) As described above, according to the present invention, when the output waveform distortion from the rotating electric machine is shaped according to the number or shape, depth, etc. of the slots of the rotating electric machine stator, it is fixed. It is economical to use a common iron core on the child side and to select various kinds of rotating electric machines suitable for desired characteristics by a simple operation of simply replacing only the magnetic pole arcuate portions.

Also, when winding the field winding around the rotor core,
Since the iron core itself has no skewed deformed portion, automatic winding and aligned winding by a machine can be performed without any trouble, and a special jig unlike the conventional one is not required.

Further, if the curvature of the arc-shaped portion of the magnetic pole is processed by a method such as cutting the arc-shaped portion of the cylindrical body processed to have a predetermined diameter, it can be made simpler and cheaper than before.

[Brief description of drawings]

FIG. 1 is a detailed view of the rotary electric machine according to the present invention as viewed from the axial direction, FIG. 2 is an enlarged view of a main part of the magnetic pole arcuate portion, FIG. 3 is a schematic view of the magnetic pole arcuate portion in plan view, and FIG. 4 is FIG. 5 is a schematic view of material removal of the arcuate portion of the magnetic pole, FIG. 5 is a detailed view of a conventional rotating electric machine, and FIG. 6 is a detailed view of a rotor shaft thereof. 2 ... Stator, 4 ... Slot 6 ... Rotor, 9 ... Magnetic pole arc portion 11 ... Cylindrical body, 12 ... Arc portion

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A rotor of a rotatable electric machine comprising a rotor core of salient poles having arcuate portions facing the inner peripheral surface of the stator, wherein the rotor winding is a field winding wound integrally with the rotor core. The turning portion is formed into a rectangular cross section perpendicular to the axis of the rotor core and a cross section parallel to the axis, and a stator inner peripheral surface is formed at the outer end of the rotor core. A magnetic pole arcuate portion having an outer peripheral arc having the same radius smaller than the radius and having a cross section perpendicular to the axis of the rotor core in the same shape over the entire length in the axial direction is formed at a predetermined angle with respect to the axis of the rotor core. A field structure of a rotary electric machine, which is tilted and fixed to the rotor core so as to be detachable.