KR930008385Y1 - Rotor of reluctance motor - Google Patents

Abstract

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Description

Rotor of reluctance motor

1 is a block diagram of a structure and a driver of a conventional reluctance motor.

2 is a perspective view of a conventional reluctance motor rotor.

3a is a cross-sectional plan view of a reluctance motor equipped with the present invention.

3b is a cross-sectional plan view of a reluctance motor showing another embodiment of the present invention.

4 is a perspective view of the rotor of the present invention.

5 is the flux of magnetic flux before the stator and rotor poles are aligned.

6a and 6b are a planar cross-sectional view of a rotor showing another embodiment of the present invention.

7 is a perspective view of a rotor showing another embodiment of the present invention.

8 is a cross-sectional view of a rotor showing another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

10: groove charging unit 20: extension charging unit

100: rotor 110: rotor pole

111: rotor core 120: groove

130: core fixing 140: spacer

150: bearing 160: rotating shaft

200: stator 210: stator pole

220: fixed winding 300: control circuit, unexplained code

320: gate 330: power

The present invention relates to a rotor of a reluctance motor that is disposed inside the motor to eliminate the air burst sound generated when rotating at high speed, and to reduce the assembly cost.

The variable reluctance motor, which brings new interest with the development of semiconductor devices including thyristors, has a stator 200 in the shape of a double salient pole as shown in FIG. 1, and the rotor 100 corresponds to this. It has the shape of a salient pole. In this variable reluctance motor, the stator winding is intensively wound around the stator 200, but the winding is not wound around the rotor 100. Meanwhile, as illustrated in FIG. 1, the stator winding 220 is wound around two stator poles 210 facing each other to have opposite polarities, thereby forming one phase. . 1 illustrates three phases in the stator 200 in this manner. Such a reluctance motor having a stator 200 and a rotor 100, as shown in FIG. 1, is provided with a control circuit unit 300 to apply a proper power condition to each phase at a desired time. In addition, the control circuit unit 300 may include a position detection sensor 310 that can feed back the position of the rotor (100).

This reluctance motor is operated as follows.

The control circuit unit 300 detects the position of the rotor 100 from the position detection sensor 310 and turns on the switch so as to be excited to the phase closest to the rotation direction, as shown in FIG. The pole opposite to the stator pole 210 is excited to the rotor pole pole 110 closest to the pole pole 210. As a result, a magnetic flux path is formed between the stator 200 and the rotor 100, and the rotor 100 rotates in a direction that increases inductance or minimizes inductance. Thus, when the poles 210 and 110 of the stator 200 and the rotor 100 are aligned, the switch which is excited on the stator 200 is turned off, and the stator poles 210 and the rotor poles ( The switch to be excited at 110 is turned on, and the magnetic flux path is made to continue to rotate. When the control circuit unit 300 is operated such that this phenomenon continues, the reluctance motor rotates at a desired torque characteristic and rotation speed. Such a reluctance motor can be rotated at a very high speed.

In such a reluctance motor, the conventional rotor 100 is formed of silicon steel sheets having a shape in which the rotor poles 110 protrude from the recesses 120 between the outer periphery, as shown in FIG. A pair of core fixing pieces 130 and a core fixing piece disposed on both ends of the rotor core 111 and the rotor core 111 which are stacked to prevent the rotor core 111 from being opened in the axial direction. It consists of a pair of spacers 140 located between the pair of bearings 150 fitted to the rotating shaft 160 to the outside of 130.

When the conventional rotor 100 rotates at a high speed in the reluctance motor, air is filled in the recess 120 formed between the rotor poles 110 of the rotor core 111, Again, the rotor poles 110 repeat the action of pushing the air in the recess 120. Therefore, the conventional rotor caused a great friction between the rotor core 111 and the air, thereby causing a defect that the air burst sound is greatly generated.

In addition, in the conventional rotor 100, since the rotor winding of the induction motor is not attenuated, a pair of core fixing pieces 130 and a pair of spacers 140 are used to fix the rotor core 111. Since it is necessary, there has been a defect in productivity due to the increase and assembly of these parts.

The object of the present invention is to provide a rotor of a reluctance motor, which firstly minimizes air rupture caused by friction between the rotor core and air, and reduces productivity by improving the number of parts.

Hereinafter, the technical configuration of the present invention in detail.

Rotor core 111 of the present invention, as shown in Figure 4, the rotor core pole 110 and the grooves 120 formed on the outer periphery of the silicon steel plate is formed by stacking in a row, the rotor core 111, Filling is filled in the groove portion 120 is integrally extended from the groove filling portion 10 to be located in the yaw portion of the groove filling portion 10 and the rotor core 111 integrally formed in the rotor core 111 It is composed of an extended charging unit 20. Here, the outer surface of the groove filling portion 10 is preferably formed to be a curved surface having the same radius as the rotor core (111).

The rotor of the present invention is disposed inside the reluctance motor and rotates at an ultra-high speed, so that the frictional resistance with air is small due to the groove filling portion 10 filled in the groove portion 120 of the rotor core 111. Therefore, it has the advantage that the occurrence of air burst sound is suppressed. In particular, the outer surface of the charging unit is formed with a curved surface having the same radius as the rotor core 111, and the frictional resistance between the rotor and the air is minimized, thereby suppressing generation of air burst sound. Here, the filler to be filled in the groove filling portion 10 is a nonmagnetic material, the specific permeability is close to 1, excellent in moldability, dimensional accuracy and stability, it is preferable to use a synthetic resin for filling with a small shrinkage. This is because the magnetic flux should not be refracted by the charging section, and no disturbance should be caused in the transmission of the magnetic flux. As such a synthetic resin material for filling, what is known under the trade name B. M. C. (Bulk MAolding Compound) is currently in circulation. B. M. C., which is distributed in this way, does not shrink and has excellent dimensional accuracy, corrosion resistance, weather resistance, and vibration damping characteristics, and thus is considered an ideal filler synthetic resin material.

On the other hand, as shown in Figure 7, the extended charge portion 20, the outer diameter at the interface between the rotor core 111 is preferably smaller than the rotor core 111 so that the stepped portion is formed. As such, the stepped portion 11 is formed, the groove filling portion 10 and the extension filling portion 20 allows the operation to hold and tighten the rotor core 111 during molding.

As shown in FIG. 3, the recess filling part 10 may have a cross-sectional shape filling the entire recess part 120, and as shown in FIG. 6, the hollow part 12 is formed therein. It may have a cross-sectional shape. Having the hollow part 12 formed therein also helps to reduce the amount of filling.

As shown in FIGS. 4 and 7, the extended charging part 20 has a diameter close to the rotor core 111 at both ends of the rotor core 111, but gradually decreases in diameter to slightly smaller than the rotation axis at the opposite side. It is desirable to have a cross-sectional shape having a large diameter. This is because the extended charging unit 20 simultaneously performs the roles of the core fixing piece and the spacer. 8 is a cross-sectional view of the rotor showing another embodiment of the present invention.

Rotating operation principle of the rotor of the present invention is also disposed inside the reluctance motor is different from the conventional one, a detailed description thereof will be omitted.

In the above, the present invention, first, the groove filling portion 10 is filled in the groove portion 120 of the rotor core 111 to reduce the frictional resistance with air to minimize the occurrence of air burst sound during high-speed rotation Second, the core fixing piece 130 and the spacer 140, which were essential components in the conventional rotor, are made together with the recess filling part 10 to be integrally formed with the rotor core 111. Figure is replaced by the extended charging unit 20, the number of parts is reduced and the hassle of assembly work is eliminated, the overall productivity is greatly improved.

As described above, the rotor of the present invention is disposed inside the motor to eliminate the air burst generated when rotating at high speed, and greatly improves the productivity by greatly eliminating the trouble of the assembly work.

Claims (6)

Rotor core made by stacking silicon steel plates formed by intersection of rotor poles and grooves on the outer periphery, and filling of the grooves with fillings in the grooves to form integral parts of the rotor core and rotor core The rotor of the reluctance motor, characterized in that consisting of an extended charging unit integrally extending from the groove filling unit to be located at both ends. The rotor of a reluctance motor according to claim 1, wherein the groove filling part is formed in a curved surface whose outer surface is the same as the rotor core and has a radius. The rotor of claim 1, wherein the filler is a nonmagnetic material having a specific magnetic permeability close to 1, excellent in formability, dimensional accuracy and stability, and having a low shrinkage. The rotor of a reluctance motor according to claim 1, wherein the recess filling part has a cross-sectional shape in which a hollow part is formed. The method of claim 1, wherein the extension charging portion has a diameter close to the rotor core at both ends of the rotor core, but gradually smaller diameter to have a cross-sectional shape having a diameter slightly larger than the rotation axis on the opposite side Rotor of reluctance motor. 6. The rotor of claim 5, wherein the extended charging portion forms a stepped portion at an interface between the rotor cores with a smaller outer diameter than the rotor cores.