JPH03117358A - Small dynamo-electric machine - Google Patents

Abstract

PURPOSE:To improve accuracy of air gap and to facilitate manufacture of an elongated motor by punching iron stripe boards from a sheet metal and inserting them into a stator casing thus constructing a stator magnetic pole. CONSTITUTION:A stator magnetic pole 9 is constructed by punching an iron board into iron stripe boards 9a1-9a8 which are then arranged radially with same diameter. A cylindrical casing 10, i.e., a yoke, is manufactured by punching an iron board such that proper length of cut grooves 10a1-10a8 and split grooves 12a1-12a4, to be fitted with the magnetic pole iron boards 9a1-9a8, are formed. Windings 11 for phase A and B are arranged within same inner diameter for respective pole iron boards 9a1-9a8 and windings of different pole groups A and B are arranged while being shifted by 1/2 pitch. Respective windings 11 are secured by means of a positioning jig and by filling resin.

Description

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

[Prior Art] As shown in Fig. 9, a conventional small-sized rotating electric machine of this type has two magnetic pole plates 2 and 2' made by protruding tooth portions at multiple locations on the inner circumferential side of an annular iron plate. 1. A stator whose teeth are alternately magnetized to N and S by excitation with the second two excitation windings 4.4゛ is installed in the case 1 as a stator, and the number of poles is the same as that of this stator. In a small rotating electric machine in which a rotating shaft 7 to which a magnetic rotor 6 magnetized to the number of poles is integrally supported is supported by the case bearing 5,
Case 1. First excitation winding 4. Two pole plates 2.2'
, second excitation winding 4. At least one groove or protrusion is provided on the outer circumferential side of each of the case front lids 3 that rotatably support the magnet rotor 6 via a bearing 5, and while positioning using these grooves or protrusions as a reference, the above-mentioned By pushing in one direction in sequence, assembly is completed and the relative positions of the magnetic poles are arranged in a predetermined manner.

Note that 8 is filled resin.

[Problems to be Solved by the Invention] Conventional small rotating electric machines of this type have the disadvantage that the stator magnetic poles are cut and raised from the sheet metal as described above, which causes them to bend under the influence of the spring bag, making it difficult to achieve air gap accuracy. there were.

Furthermore, the longitudinal (axial) dimension is restricted due to the relationship between the length of the cut and the diameter, making it difficult to manufacture an elongated type of motor.

[Means for Solving the Problems] A small rotating electric machine of the present invention is configured by radially arranging plate-shaped stator magnetic poles so as to have the same inner diameter and meeting the following secondary conditions.

B. The stator magnetic poles are composed of strip-shaped magnetic pole iron plates, and windings are attached to each stator magnetic pole directly or via a bobbin.

(b) Each stator magnetic pole is arranged within the same inner diameter at a position shifted by a predetermined pole pitch.

C2: The outer yoke interrupts the different phases and divides the magnetic circuit.

2. The outer diameter side of each stator magnetic pole is notched in the case, and the inner diameter side is positioned by a positioning bush or a jig filled with molded resin.

In this case, it is desirable that the predetermined pole pitch of each stator magnetic pole be a 1/2 pole pitch or a pole pitch similar thereto.

[Example] The present invention will be specifically described below based on an example shown in FIGS. 1 to 8.

In Figures 1 and 2, G is the stator magnetic pole and this is the third
As shown in the figure, a stator magnetic pole iron plate 9a++ 9a2.9a* is a strip-shaped stator magnetic pole iron plate punched out of a steel plate.

・Constructed by radially arranging 9 as on the same inner diameter.

Reference numeral 10 denotes a cylindrical case serving as a yoke, and as shown in FIG. 11, there are cut grooves 10a to 10a over an appropriate length in the axial direction for fitting the magnetic pole iron plates 9a to 9a, and dividing grooves to be described later. It is manufactured by punching out an iron plate to form 12a1 to 12a.

11 are windings, and these windings 11 are the air core coil 3 shown in FIG. 5 (A), the hobbin wound coil shown in FIG. There are various types of evils that can be considered.

Each winding 11 is connected to a case 10 as shown in FIGS. 1 and 6.
A phase, B phase for each magnetic pole iron plate 9a+ to 9as within
The windings of the phases are arranged within the same inner diameter, and the windings of the A pole group and the Bi group, which have different polarities, are arranged at 17 as shown in Fig. 6.
The two poles are arranged with a shifted pitch.

Note that 12a+ to 12a4 are dividing grooves for dividing each phase of A and B.

The above-mentioned windings 11, which become stator windings, are fixed using positioning jigs 13a+ and 13a2, as shown in FIG.
As shown in Figure 1, resin 1 such as insert mold resin
This is done by filling 4a+ and 14az.

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 knurled rings.

[Function] As described above, in the small rotating electrical machine of the present invention, the stator magnetic poles are constructed by punching out rectangular iron plates from sheet metal, cutting them, and fitting them into the stator case. There is also the rigidity of the stator, which can improve the accuracy of one division and one gap.

Furthermore, since the stator magnetic poles can be made elongated, it has become possible to manufacture an elongated type motor, which was impossible with conventional motors.

[Effects of the Invention] As described above, the stator magnetic poles of the small rotating electric machine of the present invention are constructed by punching out rectangular iron plates from sheet metal, cutting them, and fitting them into the stator case. It has such excellent effects.

■ Stator division accuracy and air gap accuracy can be improved.

■Since the stator magnetic poles can be made elongated, it has become possible to easily manufacture elongated type motors, including PM motors and laminated core type motors.

■Compared to conventional PM motors, the iron core of the magnetic circuit can be made thicker, allowing for higher output.

■ Due to its structure, it is suitable for devices with a small number of poles, and from that point of view it is high speed,
Suitable for high torque motors.

■Since the structure is simple, it is suitable for small rotating electric machines such as PM type stepping motors.

[Brief explanation of drawings]

1 to 8 show an embodiment of the present invention, in which FIG. 1 is a longitudinal cross-sectional side view of the entire structure of the small rotating electric machine of the present invention, and FIG. 2 is a Y-- 3 is a perspective view of the stator magnetic pole iron plate, 4 is a perspective view of the stator case, 5 (a) to 5 (c) are perspective views of stator windings, 6 is a schematic configuration diagram of the stator side, FIG. 7 is a partial sectional view showing a method of attaching stator windings, and FIG. 8 is a perspective view of the rotor. Moreover, FIG. 9 is a longitudinal sectional front view of the conventional example. 9: Stator magnetic poles 9a, ~9a1: Magnetic pole iron plate 1o: Stator case 10a1~ioam+ cut groove 11: Winding 12a1~12a,: Division groove 13a+, 13a2: Positioning jig 14a+, 14a2: Filled resin

Claims (1)

[Scope of Claims] 1. A small rotating electrical machine in which plate-shaped stator magnetic poles are arranged radially to have the same inner diameter, and is characterized by being configured under the following conditions: . B. The stator magnetic poles are composed of strip-shaped magnetic pole iron plates, and windings are attached to each stator magnetic pole directly or via a bobbin. (b) Each stator magnetic pole is arranged within the same inner diameter at a position shifted by a predetermined pole pitch. C. A dividing groove is inserted between different phases in the outer yoke to divide the magnetic circuit. D. The outer diameter side of each stator magnetic pole is positioned by a notch in the case, and the inner diameter side is positioned by a positioning bush or a jig filled with molded resin. 2. Claim 1, wherein the predetermined pole pitch of each stator magnetic pole is set to 1/2 pole pitch or a pole pitch close to this.
The small rotating electric machine described.