JPH10164806A - Reluctance motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to reduce the burden of an exciting current and ripples by a method wherein the width in the rotor rotation direction of a magnetic path at a rotor is formed to be wide in the outer circumferential part of the rotor and the width in the rotor rotation direction of a magnetic insulation part used to partition the integral number of magnetic paths at the rotor is formed to be narrow in the outer circumferential part of the rotor. SOLUTION: When a motor is position-controlled precisely, torque ripples which are generated during its rotation cause a problem. In a reluctance motor, a change in a magnetoresistance due to the position of a rotor generate torque ripples. Then, a protrusion part 2 is formed at the end part 6 of a magnetic path 1 so that the magnetoresistance in the outer circumference of the rotor is smoothed and reduced, the width of the magnetic path in a rotor rotation direction is made width at the outer circumferential part of the rotor, and an opening part 4 at a slit 3 is made narrow. Then, the torque ripples can be reduced without changing the salient pole ratio of the rotor 11. At this time, the protrusion part 2 has a depth TR, and the depth is necessary so that the continuity of a magnetic flux between a stator 12 and the rotor 11 is kept good.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reluctance motor, and more particularly to a motor having a shape in contact with an outer peripheral portion of a rotor and extending from the outer peripheral portion of the rotor toward the inside of the rotor. The present invention relates to a reluctance motor provided with a rotor having a magnetic path.

[0002]

2. Description of the Related Art FIG. 5 shows a configuration of a conventional 6-pole reluctance motor using a rotor core having a belt-shaped magnetic path. FIG. 5 is a view of the reluctance motor viewed from the axial direction, where reference numeral 11 denotes a rotor, 12 denotes a stator, and 8 denotes a stator 12.
The teeth 10 are slots of the stator 12. Rotor 11
Includes a number of band-shaped magnetic paths 1 magnetically insulated by slits 3. FIG. 4 is an enlarged view of a main part of the reluctance motor shown in FIG. 5, in which a portion where the belt-shaped magnetic path 1 faces the stator 12 is illustrated. In FIG. 4, the upper part is the rotor 11,
The lower side is the stator 12, and FIG. 4 is shown in an expanded manner so that the rotation direction is straight for simplification. Code 5
Is a connecting portion of the band-shaped magnetic path 1 of the rotor 11, 6 is an end of the band-shaped magnetic path 1, 7 is a protruding portion extending the end of the tooth 8 of the stator 12, and 9 is an opening of the slot 10. .

[0003] A stator winding is wound around the slot 10, and a rotor 11 rotates according to a magnetic field generated by a current flowing through the stator winding. For the purpose of smoothing the distribution of the magnetic field as viewed from the rotor 11,
In order to prevent the teeth 8 from falling off, a protruding portion 7 is provided at the tip of the tooth 8. The belt-shaped magnetic path 1 is formed of a magnetic material having a constant width so that a magnetic circuit is formed between the stator 12 and the magnetic flux passing through the rotor 11 without disturbing the magnetic flux. The reluctance motor using the rotor 11 having the structure shown in FIGS.
1 has a smooth change in the rotation direction of the distribution of the magnetic resistance, and a relatively good magnetic circuit can be realized from the relationship between the magnetomotive force generated by the stator windings and the magnetic resistance distribution of the rotor 11. It has characteristics that it generates torque well and has small torque ripple. The connecting part 5 is mainly composed of the rotor 1
1, the width of the connecting portion 5 is sufficiently small so that it can be treated as a nonconductor on the magnetic circuit of the reluctance motor. That is, the slit 3 of the rotor 11 is magnetically equivalent to the opening.

[0004]

In the structure of the rotor shown in FIG. 5, since the opening width of the slit 3 is wide, the band-shaped magnetic path 1 divided by the slit 3 of the rotor 11 and the slot 10 of the stator 12 are formed. The magnetic resistance of the magnetic path formed by the teeth 8 varies to some extent depending on the relative rotational position. As a result, there has been a problem that a change in the total magnetic flux of the rotor and a partial change in the magnetic flux are caused to cause an increase in an exciting current load and an increase in torque ripple. Further, the opening of the slot 10 of the conventional stator 12 is narrowed in order to reduce the average reluctance of the reluctance motor and to reduce the change in magnetoresistance due to the rotational position. As a result, it becomes difficult to perform the winding work of the stator winding, and there has been a problem that the number of operation steps and the cost are increased accordingly. Since the opening of the slot 10 is narrow, there is a problem that the workability of winding the winding is poor and this is one of the causes of obstruction of mechanical winding and automation of the winding.

The present invention has been made to solve the above problems. Accordingly, an object of the present invention is to provide a reluctance motor capable of reducing the load on the exciting current and reducing the torque ripple. Further, another object of the present invention is to achieve the above object and to easily perform the winding work of the stator winding, reduce the number of work steps, reduce the cost, and improve the workability of winding the winding. It is an object of the present invention to provide a reluctance motor that can realize improved winding and mechanical winding and automation.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 has a shape in contact with the outer peripheral portion of the rotor and extending from the outer peripheral portion of the rotor toward the inside of the rotor. In a reluctance motor provided with a rotor having a plurality of magnetic paths formed with a magnetic insulating portion interposed therebetween, the width of the magnetic path of the rotor in the rotor rotation direction is formed wider at the outer periphery of the rotor, and the rotation is increased. The width of the magnetic insulating portion separating the plurality of magnetic paths of the rotor in the rotational direction of the rotor is formed narrow at the outer peripheral portion of the rotor. That is, the width of the slit, which is a magnetic insulating portion, is reduced at the outer peripheral portion of the rotor, and the magnetic resistance of the outer peripheral portion of the rotor viewed from the stator side is reduced, so that the flow of the magnetic flux to the rotor is improved.

According to a second aspect of the present invention, there is provided a magnetic path having a shape in contact with the outer peripheral portion of the rotor and extending from the outer peripheral portion of the rotor toward the inside of the rotor, and a plurality of magnetic paths formed with a magnetic insulating portion interposed in the rotational direction of the rotor. A reluctance motor comprising: a rotor having a stator and a stator in which teeth and slots from an inner peripheral portion of the stator toward an outer peripheral portion of the stator are alternately arranged along the inner periphery of the stator. A rotor in which the width in the rotor rotation direction is formed wider at the outer periphery of the rotor, and the width in the rotor rotation direction of the magnetic insulating portion separating the plurality of magnetic paths of the rotor is narrower at the outer periphery of the rotor. A stator in which the width of the teeth along the inner circumference of the stator is formed narrower in the inner circumference of the stator, and the width of the slots along the inner circumference of the stator is formed wider in the inner circumference of the stator; It is characterized by having. That is, the opening of the slot of the stator is widened,
On the other hand, by reducing the slit width at the outer periphery of the rotor, the magnetic resistance of the rotor as viewed from the stator side is reduced, the change in magnetic resistance due to the rotor position is reduced, and the work of the stator winding is reduced. Can be improved.

[0008]

FIG. 1 shows an example of an embodiment of the present invention.
It will be described based on. FIG. 1 is an enlarged view of a part of a portion where a rotor core and a stator core face each other. In FIG. 1, an upper side is a rotor 11 and a lower side is a stator 12. FIG. 1 is a view in which the rotation direction is developed so as to be linear for simplification. Reference numeral 2 denotes a portion that protrudes from both ends of an end 6 facing the outer periphery of the magnetic path 1 in the direction of rotation of the rotor, and 4 denotes an opening of a slit (magnetically insulating portion) 3. Similarly, since the rotor magnetic path 1 is slightly connected to the outer periphery of the rotor to increase the strength of the rotor 11, the slit 3 is apparently closed.

When controlling the position of the motor accurately, torque ripple generated during rotation becomes a problem. In a reluctance motor, a change in magnetic resistance depending on a rotor position causes torque ripple. Therefore, in the reluctance motor according to the present embodiment, as shown in FIG. 1, the magnetic path 1 is set so as to smooth and reduce the magnetic resistance on the outer periphery of the rotor.
The salient pole ratio of the rotor 11 is changed by providing the protrusion 2 at the end 6 of the rotor 11 and increasing the width of the magnetic path 1 in the rotor rotation direction at the outer periphery of the rotor and narrowing the opening 4 of the slit 3. And torque ripple can be reduced. Here, the protrusion 2 has a depth TR. This depth TR is the stator 12
This is a value necessary for maintaining good magnetic flux conduction between the rotor and the rotor 11.

Next, another embodiment of the present invention will be described.
A description will be given based on FIG. FIG. 2 is an enlarged view of a part of a portion where the rotor core and the stator core face each other. FIG.
The middle and upper sides are the rotor 11 and the lower side is the stator 12. FIG.
FIG. 5 is a view developed so that the rotation direction is linear for simplicity.

In the conventional motor, the opening of the slot 10 of the stator 12 is narrowed in order to reduce the magnetic resistance of the magnetic circuit and improve the torque generation efficiency. It has the effect of reducing torque ripple. However, narrowing the opening of the slot 10 also impairs the workability in winding the winding around the stator core. When the winding is wound directly on the slot 10 by using a winding machine instead of manually, the winding machine and the slot protrusion 7 are not used.
Easily interfere with each other, which hinders the mechanization and automation of the winding operation. In the reluctance motor according to the present embodiment, as shown in FIG. 2, the shape of the slot 10 of the stator 12 is such that the opening 9 widened along the inside of the stator so as to facilitate the work of winding the winding. Provided.
That is, the slot 10 is an open slot. Since the above-described rotor 11 has a smooth magnetic resistance distribution, the use of the above-described rotor 11 solves the problem of an increase in the torque ripple due to the widened opening 9 of the slot 10. The width WS of the opening 9 corresponds to the teeth 8 of the stator 12.
Since there is no protrusion 7 at the end of the mark, the value has a sufficient space, which is optimal for mechanization and automation. Regarding the structure of the rotor 11, the rotor 11 shown in FIG.
Therefore, the description is omitted here. The teeth 8 of the stator 12 may be provided with protrusions in the opening 9 of the slot 10 in a range that does not hinder the winding operation of the winding. On the other hand, in order to eliminate the sudden change in the magnetic flux distribution generated when the rotor 11 rotates, the protrusions 2 are enlarged in the rotor rotation direction.
The width WR has a small value.

In the reluctance motors shown in FIGS. 1 and 2, adjacent projections 2 are connected to each other in order to increase the strength of the rotor 11, but in the present invention, as shown in FIG. Adjacent protrusions 2 may not be connected to each other and may be separated at appropriate intervals.
The present invention is also applicable to a linear type reluctance motor.

[0013]

According to the present invention, in the reluctance motor, the magnetic flux can be efficiently guided to the stator and the belt-shaped magnetic path, and the excitation load and the torque ripple can be reduced. Further, according to the present invention, the reluctance motor has a structure in which the slot opening is wide and the winding operation is easy, so that the labor for the winding operation can be reduced, and the cost can be reduced. Furthermore, in the present invention, in the reluctance motor, mechanization of winding work,
Automation becomes easy.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a reluctance motor according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a reluctance motor according to another embodiment of the present invention.

FIG. 3 is an enlarged view of a reluctance motor according to another embodiment of the present invention.

FIG. 4 is an enlarged view of a conventional reluctance motor.

FIG. 5 is an axial sectional view of a conventional reluctance motor.

[Explanation of symbols]

1 band-shaped magnetic path, 2 protrusions, 3 slits, 4 openings, 5 connection parts, 6 ends, 7 protrusions, 8 teeth, 9
Openings, 10 slots, 11 rotors, 12 stators,
TR The depth of the band-shaped magnetic path end projection, the width of the WR slit opening, and the width of the WS slot opening.

Claims (2)

[Claims] A rotor having a shape in contact with the outer peripheral portion of the rotor and extending from the outer peripheral portion of the rotor toward the interior of the rotor, and having a plurality of magnetic paths formed with a magnetic insulating portion interposed therebetween in the rotational direction of the rotor. In the reluctance motor, the width of the magnetic path of the rotor in the rotor rotation direction is formed to be wider at the outer periphery of the rotor, and the magnetic insulating portion that separates the plurality of magnetic paths of the rotor in the rotor rotation direction has a different width. A reluctance motor characterized in that the width is formed narrow at the outer periphery of the rotor. 2. A rotor having a shape in contact with the outer peripheral portion of the rotor and extending from the outer peripheral portion of the rotor toward the interior of the rotor, the rotor having a plurality of magnetic paths formed with a magnetic insulating portion interposed therebetween in the rotational direction of the rotor. A reluctance motor comprising: a stator in which teeth and slots extending from a stator inner peripheral portion toward a stator outer peripheral portion are alternately arranged along the stator inner periphery. A rotor formed widely at the outer periphery of the rotor and having a width in the rotor rotation direction of a magnetic insulating portion separating a plurality of magnetic paths of the rotor narrowed at the outer periphery of the rotor; and fixing the teeth. A width of the slot along the stator inner circumference is formed narrower at the stator inner circumference, and a width of the slot along the stator inner circumference is formed wider at the stator inner circumference. Reactance motor.