JPS61244249A - Ac motor - Google Patents

Abstract

PURPOSE:To reduce the unevenness of rotation, by arranging a plurality of respective permanent magnet elements for rotor members, in a form shifted positionally by specified angle from the central line in the diameter direction of the rotor members. CONSTITUTION:An AC motor has a housing 1 and yokes 2, 3 provided in the housing 1. The hollow section in the housing 1 is provided with stator winding members 4-9. Via non-permeable supporting members 14-16 supported pivotally by a rotary shaft 17, ring magnet plates 11-13 for rotor members are rotatably provided. The respective permanent magnets for the rotor members 11-13 are formed to be skewed by each specified angle alpha against the central line in the diameter direction.

Description

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

[Conventional technology]

a non-magnetically permeable housing; at least one pair of flat stator winding members disposed oppositely at a predetermined distance in the axial direction within the housing, each of the stator winding members having a circular shape; A stator winding member having an annular shape and having a plurality of windings installed in a predetermined relationship so as to generate a rotating magnetic field along the circumferential direction, and installed in the housing adjacent to both outer sides of the stator winding member. Already, an AC electric motor has a yoke member that is provided to form a closed magnetic path, and a flat rotor member that is rotatably provided in the space between the opposing stator winding members with a predetermined gap maintained between the stator winding members and the stator winding members. Are known.

[Problem that the invention seeks to solve]

The rotor member in the above AC motor is shown in FIG. In FIG. 2, (al is a perspective view and (b) is a plan view thereof. In this example, 12 permanent magnets 11-1' to 11-1 are divided at equal angles θ along the circumference.
12''. Each of the permanent magnets may be integrally formed as a rotor member and then magnetized as shown, or a plurality of permanent magnets may be individually magnetized as shown. It depends on whether the magnets are assembled together.

FIG. 3 shows a partial plan view of the stator S'4IA member.

The stator winding member 4 is provided with coils A 4a and coils B 4b alternately so as to generate a rotating magnetic field along the circumference, and each of the coils A 4a and B 4b is arranged at an angle θ of each permanent magnet of the rotor member 11'. They are provided corresponding to the permanent magnets at the same angle θ. The effective torque generation area in the radial direction of each coil of the stator winding member 4 is the range indicated by l in the figure.

As is clear from FIGS. 2 and 3, the permanent magnets and the coils are designed in a corresponding manner. Therefore, for example, the boundary line R2 between the adjacent coils 4a and 4b and the adjacent permanent magnets 11-12' of the rotor member.

When the rotor member 11' is located at a position where the boundary line R1 of the rotor member 11-1' coincides with the boundary line R1 (the other boundary lines also coincide with each other), the rotational torque becomes the minimum. For this reason, the rotor member 11' continues to rotate due to inertia, but there is a problem in that the rotational torque decreases at the above position, causing pulsations in the rotation of the rotor member.

[Means to solve the problem]

In order to solve the above-mentioned problem, the present invention provides at least one pair of coreless stator windings that are provided facing each other with a predetermined spacing between them, and rotational movement within the spacing between the pair of stator windings. In an AC electric motor having a rotor member including a plurality of permanent magnet elements along the circumference, each of the plurality of permanent magnet elements in the rotor member has a predetermined distance with respect to a radial centerline of the rotor member. An AC motor is provided, characterized in that the AC motor is provided in an angularly shifted configuration.

[For production]

Since each of the permanent magnets of the rotor member is provided in a skewed manner as described above, the permanent magnets of the rotor member are no longer perfectly aligned with each of the coils of the stator winding, and the theoretical absence of rotational torque is eliminated.

〔Example〕

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

FIG. 1 shows an alternating current motor (AC motor) as an embodiment of the present invention. In Figure 1, +al is a sectional view, ('b
) shows a plan view of the stator winding member, and (C1 shows a plan view of the rotor member. In FIG. 1, the AC motor has a housing l made of a non-i3 magnetic material with low specific gravity.
, having a cork 2, 3 made of magnetically permeable material, for example iron, provided within the housing. The inside of the housing I is hollow, and disk-shaped stator winding members 4:5, 6:7, 8:9 are provided facing each other at a constant interval. The annular stator winding member 4 includes a coil A 4 so as to generate a rotating magnetic field along the circumference.
A and coil B 4b are provided with constant .

In the space defined by the opposing stator @wire member pair 4:5, 6:7°8:9 and the inner wall of the housing l, there is a rotating shaft 17.
Annular magnet plates 11, 12, and 13 are rotatably provided with a predetermined clearance maintained through non-magnetically permeable support members 14, 15, and 16 that are pivotally supported by the magnets.

That is, the annular magnet plates 11 to 13 function as rotor members. The rotor member is fixed to the rotating shaft via the support member 14. It is preferable to use rare earth magnets for the rotor member.

Here, each permanent magnet 11-1 to 11-1 of the rotor member 11
2 are each formed skewed by an angle α with respect to the radial centerline indicated by the dashed line.

Adjacent to the outer stator winding members 4, 9 are the yokes 2, 3.
is provided. Therefore, one route: yoke 2, winding 4, rotor member 11 winding 5°6, rotor member 12, windings 7, 8, rotor 13, winding 9, yoke 3, and the opposite route. A closed magnetic circuit is formed.

Therefore, when AC power is applied to the stator winding members 4 to 9, the rotor members 11 to 13 rotate according to the rotating magnetic field, and the rotating shaft 17 rotates.

In the above-mentioned rotational operation, one of the permanent magnets and one of the coils do not completely match in position.

The permanent magnets are provided in a skewed manner, and rotational torque is always generated, and there is no position where the rotational torque becomes zero, unlike in the conventional case.

The skew angle α can be any value less than the permanent magnet placement angle θ. However, if the skew angle α is set too large, the rotational torque will decrease due to the canceling effect of the opposing magnetic poles of adjacent permanent magnets, N-3 or S-N. desirable.

In the above example, a rotor member is formed by combining skewed permanent magnets, but it is also possible to form a rotor member in advance and magnetize the rotor member at a skew angle to form permanent magnet elements. It can also be formed.

〔Effect of the invention〕

As described above, according to the present invention, an AC motor without uneven rotation can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an AC motor as an embodiment of the present invention, FIG. 2 is a diagram showing a conventional rotor member, and FIG. 3 is a plan view showing a part of a stator winding member. (Explanation of symbols) 1... Housing, 2.3... Yoke, 4-9... Stator winding, 10... Rotor support member, 11-13... Rotor member, 11-1... 11-12...Permanent magnet. Figure 1 N Exit 1 Figure 3

Claims (1)

[Scope of Claims] 1. At least one pair facing each other with a predetermined spacing therebetween.
In an AC electric motor having a pair of coreless stator windings and a rotor member configured to be rotatable within the interval between the pair of stator windings and including a plurality of permanent magnet elements along the circumference. . An AC motor, wherein each of the plurality of permanent magnet elements in the rotor member is provided at a predetermined angle with respect to a radial center line of the rotor member.