JP2945037B2 - Small rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to improvements in small rotating electric machines such as PM type stepping motors and synchronous motors.

[Prior Art] As shown in FIG.
The two magnetic pole plates 2, 2 'formed by projecting the teeth at a plurality of locations on the inner peripheral side of the annular iron plate are superposed and arranged.
Excitation by the two excitation windings 4, 4 'causes each tooth to alternately become N, S
A rotating shaft 7 integrally mounted with a magnet rotor 6 magnetized to the same number of poles as the stator is mounted on the case bearing 5 as a stator. Case of a small rotating electric machine
1, first excitation winding 4.2 two pole plates 2, 2 ', second excitation winding
4. At least one groove or projection is provided on the outer peripheral side of each of the case front lids 3 which rotatably supports the magnet rotor 6 via the bearing 5, and the above-described positioning is performed with reference to these grooves or projections. By pressing in one direction in order, the assembly is completed and the related positions of the magnetic poles are arranged in a predetermined arrangement.

 Reference numeral 8 denotes a filled resin.

[Problems to be Solved by the Invention] This type of conventional small rotating electric machine has a disadvantage that the stator magnetic poles are cut and raised from the sheet metal as described above, so that they are bent under the influence of the spring bag, and the accuracy of the air gap is hardly obtained. there were.

Further, there is a drawback that the dimension in the longitudinal direction (axial direction) is restricted due to the relationship between the length and the diameter of the cut and raised portion, and it is difficult to manufacture an elongated type motor.

[Means for Solving the Problems] In the small rotating electric machine of the present invention, a plurality of strip-shaped magnetic pole iron plates with windings are wound around the inner periphery of a cylindrical case serving as a yoke from the inner periphery of the case to the center. Radiators are arranged so as to have the same inner diameter, and the stator is constructed by fixing the windings and the magnetic pole iron plate with resin filled inside the case, and rotating with an air gap in the inner diameter part surrounded by the magnetic pole iron plate In a small rotating electric machine in which a rotor is freely disposed, a cylindrical case is formed with eight cut grooves extending in the axial direction of the case and shorter than the axial length of the case. The positional relationship is a specific reference position A, a position A 'having a predetermined angular pitch P counterclockwise from the reference position A, a position B having an angular pitch P / 2 clockwise from the reference position A, and the position B. The position B ', which is the angle pitch P more clockwise, Position A "which forms 180 degrees with respect to sub position A, position B" which forms 180 degrees with position B, position A which forms 180 degrees with position A ', and 1 with respect to position B'
A pole iron plate is radially arranged in each of the cut grooves, with one end of the pole iron plate fitted therein, between the reference position A and the position B, and between the position A ″ and the position B ″. , And between the position A 'and the position B, and between the position B' and the position A, there are formed dividing grooves for phase division which extend in the axial direction of the case and are shorter than the axial length of the case. It was configured as follows.

Embodiment The present invention will be specifically described below based on an embodiment shown in FIGS. 1 to 8.

In Figure 1-Fig. 2, 9 in the stator magnetic pole, which as shown in FIG. 3, strip-shaped stator poles iron plate 9a punched from steel plate _1, 9a _2, 9a _3, · · · 9a ₈ are arranged radially at the same inner diameter.

10 is a cylindrical case formed with the yoke, the dividing groove to be described later grooves 10a ₁ 10 A ₈ cuts over the axial direction of the appropriate length for fitting the magnetic pole iron plate 9a ₁ ~9a ₈ as shown in FIG. 4 12a ₁ 〜
Manufactured by punching a steel plate to form the 12a _4.

Numerals 11 denote windings, respectively. These windings 11 are the air-core coil 3 shown in FIG. 5 (a), the hobbin wound coil shown in FIG. 5 (b), or the iron core series shown in FIG. 5 (c). Various modes such as are conceivable.

Each winding 11 so as to place the A-phase, the windings of phase B in the same inner diameter with respect to FIG. 1 and 6 each pole iron plate 9a ₁ ~9a ₈ In the case 10 as shown in FIG. , Again A
The windings of the pole group and the B pole group are arranged so as to be shifted by 1/2 pole pitch as shown in FIG.

Incidentally, 12a ₁ ~12a ₄ is a dividing grooves for division A, B phases.

The arrangement of these cut grooves and division grooves on the circumference will be described with reference to FIG.

First, the positional relationship in the circumferential direction of the notch groove is defined as a specific reference position A, a position A 'having a predetermined angular pitch P counterclockwise from the reference position A, and an angular pitch P / 2 clockwise from the reference position A. B, a position B 'which forms an angle pitch P clockwise from the position B, a position A "which forms 180 degrees with respect to the reference position A, a position B" which forms 180 degrees with respect to position B, and a position A Position A at 180 degrees to position B, 1 position to position B '
It is represented by position B at 80 degrees.

Further, the dividing groove 12a3 is between the reference position A and the position B, the dividing groove 12a1 is between the position A "and the position B", the dividing groove 12a2 is between the position A 'and the position B, and the dividing groove 12a4 is the position. B 'and position A
And are formed between them.

As shown in FIG. 4, these cut grooves and split grooves each extend in the axial direction of the case 10 and have a length shorter than the axial length of the case 10.

As shown in FIG. 7, the respective windings 11 serving as stator windings are fixed using positioning jigs 13a ₁ and 13a _2, and 14a ₁ and 14a ₂ made of insert mold resin or the like as shown in FIG. It shall be performed by filling.

 15 is a rotor and 16 is a rotor shaft.

17 and 17 'are bearings, 18 and 18' are retaining rings, and 19 and 19 'are Kansa, respectively.

[Operation] The small rotating electric machine according to the present invention is configured such that the stator magnetic poles are formed by punching a strip-shaped iron plate from a sheet metal and cutting and inserting the iron plate into the stator case as described above. And the rigidity of the stator, so that the division accuracy and gap accuracy can be improved.

In addition, since the stator poles can be made slender, it has become possible to manufacture slender motors that were not possible with conventional motors.

[Effect of the Invention] As described above, the small rotating electric machine of the present invention is configured such that the stator magnetic poles are formed by punching a strip-shaped iron plate from a sheet metal, cutting the same, and fitting the same into the stator case. It has such excellent effects.

The stator division accuracy and air gap accuracy can be improved.

Since the stator poles can be made elongated, it has become possible to easily manufacture slender motors for both PM motors and laminated iron core motors.

Compared to conventional PM motors, the thickness of the iron core of the magnetic circuit can be increased, resulting in higher output.

In terms of configuration, it is suitable for those with a small number of poles.
Suitable for high torque motors.

Because of its simple structure, it is suitable for small rotating electric machines such as PM stepping motors.

[Brief description of the drawings]

1 to 8 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional side view of the entire structure of the small rotating electric machine of the present invention, and FIG. 3 is a perspective view of a stator magnetic pole iron plate, FIG. 4 is a perspective view of a stator case, FIGS. 5A to 5C are perspective views of a stator winding, and FIG. FIG. 6 is a schematic configuration diagram on the stator side, FIG. 7 is a partial sectional view showing a method of attaching the stator windings, and FIG. 8 is a perspective view of the rotor. FIG. 9 is a longitudinal sectional front view of a conventional example. 9 : Stator poles 9a _{1 to} 9a ₈ : Magnetic pole iron plate 10: Stator case 10a _{1 to} 10a ₈ : Cut groove 11: Winding 12a _{1 to} 12a ₄ : Split groove 13a ₁ , 13a ₂ : Positioning jig 14a ₁ , 14a ₂ : Filled resin

Claims (1)

(57) [Claims] 1. A plurality of strip-shaped pole iron plates wound with windings are arranged radially from the inner periphery of the case to the center so as to have the same inner diameter on the inner periphery of a cylindrical case serving as a yoke. The stator is constructed by fixing the winding and the magnetic pole iron plate with a resin filled inside the case, and the rotor is rotatably disposed with a gap in an inner diameter portion surrounded by the magnetic pole iron plate. In the small rotating electric machine, eight notches are formed in the cylindrical case and extend in the axial direction of the case and are shorter than the axial length of the case.
The circumferential positional relationship of these notches is defined as a specific reference position A, a position A 'having a predetermined angular pitch P counterclockwise from the reference position A, and an angular pitch P / C from the reference position A clockwise. 2, a position B 'which forms an angle pitch P clockwise from the position B, a position A "which forms 180 degrees with respect to the reference position A, and a position B" which forms 180 degrees with respect to the position B , And a position B which forms 180 degrees with respect to the position A 'and a position B which forms 180 degrees with respect to the position B'. And between the reference position A and the position B, between the position A "and the position B", between the position A 'and the position B, and between the position B' and the position A, respectively. In addition, a dividing groove extending in the axial direction of the case and shorter than the axial length of the case is provided. A small rotating electric machine characterized by being formed.