JPS61185051A - Ac motor - Google Patents

Abstract

PURPOSE:To enhance a rotary force by increasing the diameter only at the outside of a rotor member, thereby increasing the effective area of the member without decreasing the strength of supporting a stator winding member. CONSTITUTION:An AC motor has outside stator winding members 4-7, and rotor members 10, 11 made of permanent magnets are disposed oppositely to the windings 4-7. The diameters of the members 10, 11 are increased so as to increase the effective area of the members 10, 11 and to increase the passing magnetic flux. However, the members 10, 11 are increased only at the diameter of the outside to prevent the supporting strength of the members 4-7 from decreasing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an alternating current motor having a rotor having disk-shaped permanent magnets and a coreless stator winding.

[Conventional technology]

AC motors such as AC servo motors are already known, but AC motors are used in automatic control systems such as NC and robots, and have high electrical loading and magnetic loading, short magnetic paths, and large torque. There is a demand for an AC motor that can rotate smoothly and smoothly.

In order to satisfy this demand, the applicant has devised a new AC motor, which was filed concurrently with the present application.

FIG. 2 shows a cross-sectional view of the AC motor. In FIG. 2, the AC motor includes a housing 1' made of a non-magnetically permeable material with low specific gravity, and a yoke 2' made of a magnetically permeable material, for example iron, provided inside the housing.
, 3'.

The interior of the housing 1' is hollow, and disk-shaped stator winding members 4:5, 6:7 are provided facing each other at a constant interval.

A plan view of one of the stator winding members 4 is shown in FIG. The annular stake winding member 4 is provided with a coil A4a and a coil B4b maintained in a constant relationship so as to generate a rotating magnetic field along the circumference.

An annular magnet plate is inserted into the space defined by the opposing stator winding member pair 4:5, 6:7 and the inner wall of the housing 1' via a magnetically non-permeable support member 12.13 pivotally supported on the rotating shaft 14. 10' and 11' are rotatably provided with a predetermined clearance maintained. That is, the annular magnet plates 10', 11
' functions as a rotor, and one of them is the fourth rotor.
As shown in the figure.

The rotor 11' consists of magnet pieces divided into six parts on the circumference,
It is magnetized as shown. Inner groove 11C' of rotor 11'
is fitted into the protrusion of the support member 12 and fixed to the support member 12. Preferably, the rotor 11' is made of rare ±1iff stone.

a yoke 2' adjacent to the outer stator winding members 4, 7;
3' is provided. Therefore, one path: Yoke 2
', winding 4, rotor 10', winding 5.6, rotor 11'
, the winding 7, the yoke 3', and the opposite path form a closed magnetic circuit.

Therefore, when AC power is applied to the stator winding members 4 to 7, the rotor 10'11' rotates in response to the rotating magnetic field, and the rotating shaft 14 rotates.

In this way, by arranging multiple disc-shaped stators in the axial direction and providing a disc-shaped rotor with multi-pole magnetization in the circumferential direction between each stator, charge loading,
High magnetic loading is possible. In addition, the magnetic path is short and large torque can be obtained, resulting in good efficiency. Furthermore, unlike conventional AC servo motors, the stator does not use an iron core, and the inductance of the windings is small, so there is little output drop during high-speed rotation. Torque constant decreases little even at large currents. Furthermore, since the conductors of the stator winding can be arranged with high density, smooth rotation can be obtained.

As shown in FIG. 4, there is no need in principle to reinforce the effective portion of the rotor disk with any other material, so the total amount of magnetic flux does not decrease. Furthermore, since an integral ring-shaped magnet is formed in the circumferential direction, maximum torque can be generated.

[Problem that the invention seeks to solve]

There is also a demand for such new AC motors to have even higher performance without reducing their mechanical strength.

[Means to solve the problem]

The present invention has been devised from this point of view, and includes a magnetically non-permeable housing, and at least one pair of flat stator winding members provided facing each other at a predetermined distance in the axial direction within the housing. wherein each of the stator winding members has an annular shape and a plurality of windings are attached in a predetermined relationship so as to generate a rotating magnetic field along the circumferential direction, the stator winding member a yoke member that is provided in the housing so as to be adjacent to both outer sides of the housing and forms a closed magnetic path; and a yoke member that rotates while maintaining a predetermined gap with the stator winding member in the space of the opposing stator winding member. a flat rotor member provided in the rotor member, the portion facing the stator winding member being magnetized in a predetermined relationship and fixed to the rotating shaft via a non-magnetic support member; Among the flat rotor members, there are a few rotor members that face the stator winding members on both outer sides (the effective diameter of the surface facing the outer stator winding members is larger than the effective diameter of the other flat rotor members). To provide an AC motor, wherein the inner shape of the housing is defined so as to accommodate the rotor member with a predetermined gap.

[For production]

The diameter of the rotor member is increased in order to increase the effective area of the rotor member made of permanent magnets, increase the passing magnetic flux, and increase the rotational force. However, stator jf! In order to prevent the support strength of the five-wire member from decreasing, the diameter of the rotor member whose diameter is increased is increased only on the outer surface of the outer rotor member.

〔Example〕

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

FIG. 1 is a sectional view of an AC motor as an embodiment of the present invention. In FIG. 1, the same elements described in connection with FIG. 2 are given the same reference numerals. Therefore, the stator winding members 4 to 7, the supporting members 12 and 13, and the rotating shaft 14
is the same as that shown in FIG.

The AC motor in Fig. 1 has an outer stator @ wire members 4, 7.
(In this example, since no other intermediate rotor members are shown, the rotor members 10, 11 are both located opposite the outer stator winding member 4.)
．． 7) is the outer stator winding member 4,
The diameter of the surface facing 5 is larger than the diameter of the other surface and the diameter of another intermediate rotor member (not shown).

An embodiment of the rotor member 11 is shown in FIG. Rotor member 1
1 is one annular magnetic pole plate 11a and the other annular magnetic pole plate 1
Supporting member 1 is made by attaching 1b using adhesive 11C.
An inner groove lid is provided which fits into the protrusion No. 3. Each magnetic pole plate 11a.

Reference numeral 11b has six fan-shaped sections arranged and fixed along the circumference as shown in the figure and magnetized as shown in the figure. The radius r of the left magnetic pole plate 11a is the rotor member 1 described in FIG.
1', but the radius r1 of the right magnetic pole plate 11b is larger than both. Since the diameters in one direction are all the same, the effective area of the right magnetic pole plate 11b is larger than that of the left magnetic pole plate 11b. Therefore, the passing magnetic flux is larger than in the cases shown in FIGS. 2 and 4, so that a large rotational force can be obtained.

In this way, for each rotor member 10.11, the diameter of the surface facing the outer stator winding member 4.7 adjacent to the yoke 2.3 is increased, and the diameter of the other surface is increased as shown in FIGS. 2 and 4. The reason why this is done is to ensure an effective area for supporting the stator winding members 5 and 6 fixed by the housing 1 and to not reduce the support strength of the stator S wire members 5 and 6. In contrast, the outer stator winding 4
As shown in FIG. 1, the effective support area of the housing 1 becomes smaller at 7, but since each is fixed to the surface of the housing 1 on the side of the yoke 2 and 3 and supported one by one, the support strength is reduced. The decline is relatively small.

Further, by making the shape of the rotor as shown in FIG. 5, the inner wall portion of the housing 1 has a section 8.
It has a shape with . It is also desirable that the yoke 2.3 be made larger to match the larger diameter of the rotor member.

Another embodiment of the rotor member is shown in FIG. The rotor 20 shown in FIG. 6 has two magnetic pole plates 11a and 11b that are integrally formed, rather than being surface-attached as shown in FIG. That is, the protrusion peripheral portion 2 is attached to the magnetic pole portion 20a serving as the base.
0b is provided.

Further, as shown in FIG. 7, the circumferential edge of the rotor may be formed in multiple stages, or may be sloped as shown in FIG. The inner wall of the housing 1 is determined according to these shapes.

〔Effect of the invention〕

As described above, according to the present invention, the magnetic flux can be increased without reducing the rigidity of the stator support portion, and a large rotational force can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an electric motor as an embodiment of the present invention, FIG. 2 is a sectional view of a conventional electric motor, FIG. 3 is a plan view of a stator winding member, and FIG. 4 is a sectional view of a conventional electric motor. FIGS. 5 and 6 are perspective views of the rotor member in the electric motor shown in FIG. 1; FIGS. 7 and 8 are sectional views showing the peripheral edge of other rotor members; FIGS. , is. (Explanation of symbols) 1...Housing, 2.3...Yoke, 4-7...
・Stator winding, 8.9...Housing internal paragraph, 1
0°11...Rotor member, 12,1.3...Supporting member, work 4...Rotating shaft. Fig. 1 Fig. 2 Cross section Cross section concavity λ On

Claims (1)

[Claims] 1. A non-magnetically permeable housing; at least one pair of flat stator winding members provided in the housing to face each other at a predetermined distance in the axial direction, the stator Each of the winding members has an annular shape and a plurality of windings are installed in a predetermined relationship so as to generate a rotating magnetic field along the circumferential direction, and adjacent to both outer sides of the stator winding member. a yoke member provided in the housing to form a closed magnetic path; and a flat plate-shaped member rotatably provided in the space between the opposing stator winding members with a predetermined gap between them and the stator winding members. A rotor member in which a portion facing the stator winding member is magnetized in a predetermined relationship and fixed to a rotating shaft via a non-magnetic support member; The effective diameter of at least the surface facing the outer stator winding member of the rotor member facing the both outer stator winding members is larger than the effective diameter of the other flat rotor member, and the inner side of the housing An alternating current electric motor having a shape that accommodates the rotor member with a predetermined gap. 2. The AC electric motor according to claim 1, wherein the rotor member is formed with a plurality of magnetic pole plates having different diameters attached face-to-face. 3. The AC motor according to claim 1, wherein the circumferential edge of the rotor member has a plurality of steps. 4. The peripheral edge of the rotor member is inclined. An AC motor according to claim 1.