KR101106420B1 - Rotor and synchronous reluctance motor - Google Patents

Abstract

The present invention relates to a rotor and a synchronous reluctance motor. The rotor according to the present invention includes a rotation shaft; The shaft hole has a disc shape and is formed through the center so that the rotating shaft is accommodated in the center, and each end of the shaft hole is spaced apart from the outer diameter surface by a predetermined distance, and the central region is convexly penetrated toward the shaft hole. A plurality of slits each of which is formed to have different curvatures around a reference point having a minimum thickness with the outer diameter surface, and alternately arranged with the slits so as to form a magnetic path between the slits along a radial direction It characterized in that it comprises a rotor core which is formed to each have a plurality of strips. As a result, the flow of the magnetic flux becomes smooth, and the efficiency can be improved.

Description

ROTOR AND SYNCHRONOUS RELUCTANCE MOTOR

1 is a perspective view showing an example of a rotor of a conventional synchronous reluctance motor,

2 is a plan view of the rotor core of FIG.

3 is a plan view of another example of a rotor of a conventional synchronous reluctance motor,

4 is a plan view of a synchronous reluctance motor according to an embodiment of the present invention;

5 is an enlarged view illustrating main parts of FIG. 4;

6 is an enlarged view of each slit of FIG.

7A and 7B are diagrams for explaining the operation of a synchronous reluctance motor according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

110: stator 111: stator core

115: Slot 117: Teeth

120: rotor 131: rotor core

135: first slit 136c: arc

136d: straight portion 145: second slit

146c, 156c: first arc 146d, 156d: second arc

155: third slit 161: D axis

162: Q axis

TECHNICAL FIELD The present invention relates to a rotor and a synchronous reluctance motor, and more particularly, to a rotor and a synchronous reluctance motor which allow the flow of magnetic flux to be smooth and improve efficiency.

In general, synchronous reluctance motors are evaluated as economical and reliable because they are simpler in construction and require smaller power supplies than conventional inductive and synchronous drive systems.

Synchronous reluctance motors are typically formed so that both the stator and the rotor have a plurality of poles, the stator has a phase winding and the rotor does not have a winding or a magnet.

1 is a perspective view showing an example of a rotor of a conventional synchronous reluctance motor, FIG. 2 is a plan view of the rotor core of FIG. 1, and FIG. 3 is a plan view of another example of a rotor of a conventional synchronous reluctance motor. As shown in these figures, the rotor of the synchronous reluctance motor has a rotational shaft 11 and a reluctance around the shaft hole 23 and the shaft hole 23 having a disk shape and in which a rotating shaft 11 is accommodated and coupled to the center thereof. The rotor core 21 is formed by insulating laminated electrical steel sheet 22 having a plurality of slits 24 formed therethrough so as to form torque.

Each slit 24 is penetrated so as to be spaced apart from the outer diameter surface by a predetermined distance and the center region is convex toward the axial hole 23, and is formed to be spaced apart along the radial direction, and between each slit 24 along the radial direction. Each strip portion 25 is formed to form a magnetic path.

On the other hand, the reluctance torque is, as is known, the pole number and the reluctance in the direction of the D-axis (direct-axis) where only a gap exists between each tooth of the stator and the rotor (not shown) and the angle of the stator. Flux is determined by the product of the retardance in the Q-axis direction where multiple flux barriers exist between the teeth and the rotor, and the product of the current in the D-axis direction and the current in the Q-axis direction. Increasing the number of slits 24 by reducing the width of the slits 24 forming the barrier is advantageous for increasing the reluctance torque, but in such a case, maintaining proper shape to suppress the deformation of the rotor core 21. Since it is difficult to secure the strength and problems such as addition of manufacturing labor due to the increase of the slit 24 occur, in actual production, as shown in FIG. 3, the width and the number of the slit 24 are properly adjusted. Required to form .

By the way, in the rotor of the conventional synchronous reluctance motor, the end of each slit 24 is formed as a straight end 31a, as shown in FIG. 2, or as shown in FIG. Since it is formed in the form of a single arc-shaped end portion 31b having R), there is a problem that the flow of magnetic flux is not smooth and there is a limit in improving the efficiency of the motor.

Accordingly, it is an object of the present invention to provide a rotor and a synchronous reluctance motor capable of smoothly flowing magnetic flux and improving efficiency.

The object is, according to the present invention, a rotating shaft; The shaft hole has a disc shape and is formed through the center so that the rotating shaft is accommodated in the center, and each end of the shaft hole is spaced apart from the outer diameter surface by a predetermined distance, and the central region is convexly penetrated toward the shaft hole. A plurality of slits each of which is formed to have different curvatures around a reference point having a minimum thickness with the outer diameter surface, and alternately arranged with the slits so as to form a magnetic path between the slits along a radial direction It is achieved by a rotor, characterized in that it comprises a rotor core formed to each have a plurality of strips.

Here, the rotor core is formed to have four poles in the circumferential direction, and each of the magnetic poles is preferably provided with first to third slits disposed in the radial hole side in the radial direction from the outer diameter surface side, respectively.

It is effective to configure the end of each slit such that the curvature of the arc arranged close to the D axis around the reference point is smaller than the curvature of the arc arranged close to the Q axis.

An end portion of the first slit includes an arc that is disposed close to the D axis about the reference point, and the Q axis side is configured to be connected in a straight line with the outer edge of the first slit.

On the other hand, according to another field of the invention, any one of the rotor having the above-described characteristics, and the receiving hole is formed to accommodate the rotor in the center and six open to the receiving hole side for each pole of the rotor A synchronous reluctance motor is provided comprising a stator having a slot and a tooth, respectively.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

4 is a plan view of a synchronous reluctance motor according to an embodiment of the present invention, FIG. 5 is an enlarged view of main parts of FIG. 4, FIG. 6 is an enlarged view of each slit of FIG. 5, and FIGS. 7A and 7B are present views. A diagram for describing the operation of a synchronous reluctance motor according to an embodiment of the present invention. As shown in these drawings, the synchronous reluctance motor has a rotating shaft 121, a disk shape, and a shaft hole 133 is provided at the center so that the rotating shaft 121 can be accommodated and coupled to the shaft hole 133. Each end is spaced apart from the outer diameter surface at predetermined intervals and the central region is a plurality of first to third slits 135, 145, 155 and convexly penetrating toward the shaft hole 133, and the respective slits 135, 145, 155 along the radial direction. It has four magnetic poles, each having a plurality of strips 141 alternately arranged with each of the slits 135, 145, and 155 so as to form a magnetic path therebetween, and the ends of each of the slits 135, 145, and 155 have a thickness t with an outer diameter surface. A rotor (120) having a rotor core (131) formed to have different curvatures around a reference point (O) at which is minimized; Receiving holes 113 are formed in the center to accommodate the rotor 120 and each of the six slots 115 and teeth 117 open to the receiving hole 113 per pole of the rotor 120, respectively It is comprised including the stator 110.

In the stator 110, a receiving hole 113 is formed in the center to accommodate the rotor 120, and 24 slots 115 and teeth 117 alternate with each other along the circumferential direction of the receiving hole 113. And a stator coil 112 wound around the slot 115 in a four-pole distribution winding system. The stator coil 112 is configured in the same manner as the distribution winding method of the conventional three-phase induction machine, and the principle of generating the rotating magnetic field is also configured in the same manner as the conventional three-phase AC motor.

The rotor 120 has a rotation shaft 121 and a disk shape, and a shaft hole 133 is formed through the shaft hole 133 so as to accommodate the rotation shaft 121 at the center thereof, and the circumference of the shaft hole 133 so as to generate a reluctance torque. Rotor core 131 is formed by insulating laminated electrical steel sheet having a plurality of slits (135, 145, 155) formed in both ends are proximal to the outer diameter surface in the radial direction and the central region is convexly penetrating toward the shaft hole (133). Equipped.

On the plate surface of the rotor core 131, first to third slits 135, 145, and 155 are disposed to be spaced apart from the outer diameter surface in a radial direction corresponding to each magnetic pole of the stator 110, and the first slit 135 is formed. ) Consists of a pair each.

On the other hand, the ends of each slit 135, 145, 155 is formed to be spaced apart from the outer diameter surface of the rotor core 131 to a thickness (t) to maintain a predetermined shape holding strength, the thickness (t) with the outer diameter surface Are each formed to have different curvatures R1 to R6 around the reference points O1, O2, and O3 that are the minimum.

An end of the first slit 135 has an arc 136c, a reference point O1 and a first point having a predetermined curvature R1 connecting the reference point O1 and the inner edge 136a of the first slit 135. It is formed so that the linear part 136d which connects the outer edge part 136b of one slit 135 in a substantially linear form may be provided.

The second slit 145 and the third slit 155 have a D-axis so as to connect the reference points O2 and O3 to the respective inner edges 146a and 156a of the second slit 145 and the third slit 155. The first arcs 146c and 156c disposed close to the 161 and the reference points O2 and O3 and the respective outer edges 146b and 156b of the second slit 145 and the third slit 155 are connected to each other. And second arcs 146d and 156d disposed to be adjacent to the Q axis 162. Here, the curvatures R3 and R5 of the first arcs 146c and 156c are preferably configured to be smaller than the curvatures R4 and 46 of the second arcs, respectively (R3 <R4, R5 <R6). .

With this configuration, when power is applied to the stator coil 112, each of the teeth 117 of the stator core 111 and the strip portion 141 of the rotor core 131 have a conventional single curvature shown in FIG. 7B. Compared with the rotor having each slit formed by an arc having a circular arc, as shown in FIG. 7A, the magnetic flux is appropriately distributed so that the flow is smooth and the magnetic flux density on the D-axis 161 is increased. Efficiency is improved. That is, in the case of a rotor composed of an arc having a conventional single curvature, as shown in FIG. 7B, the magnetic flux density of the magnetic flux density (A 'region) of the rotor core is lower than that of the stator core of the stator core on the D axis. On the other hand, the synchronous reluctance motor having the rotor 120 according to the present invention has a magnetic flux density (region A) and a rotor core (a) of the stator core 111 on the D axis 161, as shown in FIG. The magnetic flux density (A 'region) of the 131 has almost the same level, and the magnetic flux density is increased compared to the conventional art.

As described above, according to the present invention, the shaft has a disk, and has a disk hole in the center so that the rotating shaft is accommodated in the center, each end around the shaft hole is spaced apart from the outer diameter surface at a predetermined interval and the central area Has four magnetic poles each having a plurality of slits convexly penetrating toward the axial hole and a plurality of strip portions alternately arranged with the slits to form a magnetic path between the slits along the radial direction, the ends of each slit The rotor and the synchronous reluctance motor that can improve the efficiency by smoothly flowing the magnetic flux by having a rotor core formed to have a different curvature around the reference point to minimize the thickness with the outer diameter surface Is provided.

Claims (5)

A rotating shaft; The shaft hole has a disc shape and is formed through the center so that the rotating shaft is accommodated in the center, and each end of the shaft hole is spaced apart from the outer diameter surface by a predetermined distance, and the central region is convexly penetrated toward the shaft hole. A plurality of slits each of which is formed to have different curvatures around a reference point having a minimum thickness with the outer diameter surface, and alternately arranged with the slits so as to form a magnetic path between the slits along a radial direction A rotor comprising a rotor core formed to have a plurality of strips, respectively. The method of claim 1, The rotor core is formed to have four poles in the circumferential direction, and each of the magnetic poles are provided with first to third slits disposed in the radial hole side in the radial direction from the outer diameter surface side, respectively. 3. The method of claim 2, The end of each slit is a rotor, characterized in that the curvature of the circular arc disposed close to the D axis with respect to the reference point is smaller than the curvature of the circular arc disposed close to the Q axis. The method of claim 3, The end of the first slit includes a circular arc disposed close to the D axis with respect to the reference point, wherein the Q-axis side is connected to the outer edge of the first slit in a straight line. A stator having a rotor according to any one of claims 1 to 4 and an accommodating hole formed in the center to accommodate the rotor and having six slots and teeth open to the accommodating hole side for each magnetic pole of the rotor. A synchronous reluctance motor, characterized in that it comprises.

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