KR20080018380A - Pole change type synchronous motor - Google Patents

Abstract

A pole change type synchronous electric motor is provided to improve rotation characteristics of the motor by obtaining uniform gap between teeth by minimizing the space of an exciting pole. In a pole change type synchronous electric motor(100), a stator(110) has a number of teeth(111) wound with a motor coil(112). A rotor(120) rotates from the stator, and has a number of conductors(122) along the edge adjacently to the circumference. A magnet layer(130) comprises an outer magnet layer(131) installed to have an air gap with the tooth on the circumference of the rotor and an inner magnet layer installed in the conductors of the rotor, and is made of a magnet to be re-magnetized. An exciting pole(140) faces the magnet layer, and is wound with an excitation coil(141), and performs magnetization to arrange poles of the magnet layer in turn.

Description

Pole CHANGE TYPE SYNCHRONOUS MOTOR

1 is a cross-sectional view showing a polar conversion synchronous motor according to the prior art,

Figure 2 is a plan sectional view showing a pole conversion synchronous motor according to the present invention,

Figure 3 is an exploded perspective view showing the main part of the pole conversion synchronous motor according to the present invention,

4 is a cross-sectional view showing main parts of a pole conversion synchronous motor according to the present invention.

<Description of Symbols for Main Parts of Drawings>

110: Stator 111: Tooth

112: motor coil 120: rotor

121: shaft hole 122: conductor

123: upper coupling groove 124: lower coupling groove

130: magnet layer 131: outer magnet layer

132: inner magnet layer 132a: upper magnet ring

132b: Lower magnet ring 140: Exciting pole

141: Coil for Women

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pole conversion synchronous motor, wherein the magnetic flux of a magnet layer is increased even if the amount of excitation coil is reduced.

In general, a motor is a device that obtains rotational force by converting electrical energy into mechanical energy, and is widely used in home appliances as well as industrial equipment. The motor is largely divided into a DC motor and an AC motor.

Brushless brushless DC (BLDC) motors are used to overcome the drawbacks of brush wear, which causes current to flow in coils by contact with commutators in DC motors. These brushless DC motors have high torque and controllability. While not only this is excellent but also can be achieved quickly, the cost of using an inverter to change the direction of the current is expensive.

On the other hand, the LSPM Line Start Permanent Magnet Synchronous Motor, which is a kind of AC motor, does not use an inverter, unlike a BLDC motor, and a secondary current and a stator generated by a voltage induced in a conductor of a rotor. It is driven by the torque generated by the interaction of the magnetic flux generated by the winding of the), wherein the torque is started by the torque line segment by the cage, the combined torque of the reluctance torque and the magnet torque. In addition, the magnetic flux of the magnet installed in the rotor and the magnetic flux generated in the stator during the rated operation are synchronized with each other to operate at the speed of the stator's rotating magnetic field.

Since the LSPM synchronous motor always has magnetic flux, the magnet generates negative torque during the initial startup, and has a disadvantage of degrading the performance of the initial startup.To overcome this disadvantage, the WPM (Written Pole Motor) is called. Extremely convertible synchronous motors have been developed.

When described with reference to the accompanying drawings a pole-conversion synchronous motor according to the prior art as follows.

1 is a cross-sectional view showing a polar conversion synchronous motor according to the prior art. As shown, the conventional pole-transformed synchronous motor 10 has a stator 11 and a stator 11 in which a plurality of teeth 11b on which the motor coil 11a is wound are arranged along an inner circumferential surface thereof. The rotor 12 is rotatably installed inside the rotor 11 and a plurality of conductors 12a are inserted along the edge, and the rotor 12 is provided on the outer circumferential surface of the rotor 12 to have a gap with the tooth 11b. Exciting poles are provided between the magnet layer 13 made of a remagnetizable magnetic material and the magnet layer 13 between the teeth 11b of the stator 11 and the female coil 14a is wound. pole 14).

The pole conversion synchronous motor 10 according to the related art has a primary induced voltage generated on the stator 11 side by applying power to the motor coil 11a for driving, and thus, the conductor 12a of the rotor 12. The rotor 12 rotates by generating a start torque by the interaction of the secondary induced voltage generated from the side. When the rotational speed of the rotor 12 reaches a certain speed, the AC power is applied to the excitation coil 14a. The magnetic flux and stator generated by the magnet layer 13 are magnetized by magnetizing the magnet layer 13 so that a predetermined number of N poles and S poles are alternately formed along the circumferential direction by the exciting pole 14. The magnetic flux generated at 11 is synchronized so that the rotor 12 reaches the synchronous speed.

When the rotor 12 reaches the synchronous speed, the AC power applied to the excitation coil 14a is cut off, and the magnet layer 13 maintains the magnetization state for generating the drive torque.

However, the pole-converted synchronous motor 10 according to the related art is an excitation coil wound around the outer circumferential surface of the exciting pole 14 to magnetize the magnet layer 13 to a predetermined size or more in order to generate torque required for driving. The amount of 14a is increased, which takes up a lot of space between the teeth 11b, and damages the same spacing of the teeth 11b, which adversely affects the uniform rotation of the rotor 12. Had a problem.

Therefore, by reducing the amount of the excitation coil 14a, the distance between the teeth 11b in which the exciting pawls 14 are located is minimized, while the magnet layer 13 magnetizes to a desired size or higher, thereby increasing the output power and increasing the driving torque. It is necessary to develop a pole conversion synchronous motor (10) capable of realizing high efficiency.

The present invention is to solve the above-mentioned problems, the object of the present invention is to increase the magnetic flux of the magnet layer even if the amount of the excitation coil is increased to minimize the space where the exciting pole is located to make the spacing between the teeth uniform. It contributes to improve the rotational characteristics of the motor, thereby providing a pole conversion synchronous motor that realizes high power and high efficiency through increased driving torque.

In order to achieve the above object, the present invention provides a stator in which a motor coil is wound around a plurality of teeth arranged in a pole-converted synchronous motor, and is provided to rotate from the stator. It consists of a rotor to be installed, an outer magnet layer installed to have a tooth and a void on the outer circumferential surface of the rotor, and an inner magnet layer installed inside the conductors in the rotor, and a magnet layer made of a magnetic material that can be remagnetized, and a tooth of the stator. It is characterized in that it comprises an exciting pole which is provided to face the magnet layer, the excitation coil is wound, and performs magnetization for alternately arranging the poles in the magnet layer.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

2 is a cross-sectional plan view showing a pole conversion synchronous motor according to the present invention, Figures 3 and 4 is an exploded perspective view and a cross-sectional view showing the main part of the pole conversion synchronous motor according to the present invention. As shown, the pole-type synchronous motor 100 according to the present invention is installed to rotate from the stator 110 and the stator 110, the motor coil 112 is wound on a plurality of teeth 111, A plurality of conductors 122 are installed so as to be adjacent to the outer circumferential surface, and the outer magnet layer 131 and the rotor 120 installed on the outer circumferential surface of the rotor 120 are installed inward of the conductor 122. Exciting pole which is composed of the inner magnet layer 132 and the magnet layer (130) made of a remagnetizable magnetic material and the tooth 111 of the stator 110 to magnetize the magnet layer 130 (exciting pole; 140).

The pole-type synchronous motor 100 according to the present invention may be configured not only as an inner rotor type but also as an outer rotor type. In this embodiment, the inner rotor type will be described as an example.

The stator 110 is provided such that a plurality of teeth 111 are arranged along an inner circumferential surface, and a motor coil 112 is wound around each tooth 111, and a rotor 120 is installed inside.

The rotor 120 has a shaft (not shown) fixed to the shaft hole 121 formed at the center thereof, and the shaft (not shown) is coupled to a case such as a housing or a shell through a bearing to form a gap with the tooth 111. It is installed so as to be rotatable from the stator 110, and a plurality of conductors 122 such as aluminum (Al), copper (Cu), etc. are inserted and installed along the edge so as to be adjacent to the outer circumferential surface.

The magnet layer 130 is made of a magnetic material that can be remagnetized, and may be made of a hard magnetic material as well as a soft magnetic material, and the outer magnet layer 131 and the inner magnets, which are installed with the conductors 122 interposed between the rotors 120, respectively. It is made of a magnet layer 132.

The outer magnet layer 131 may be pressed into the outer circumferential surface of the rotor 120 or divided into a plurality of parts to be installed by adhesion.

The inner magnet layer 132 is installed along the edge from the rotor 120 to the inside of the conductors 122, as shown in Figures 2 and 4, the rotor (120) to facilitate installation in the rotor (120) And upper and lower magnet rings 132a and 132b inserted and mounted from the upper and lower sides of the 120, respectively.

The rotor 120 has upper and lower coupling grooves 123 and 124 formed therein so that the upper and lower magnet rings 132a and 132b are mounted, respectively.

The rotor 120 allows the inner magnet layer 132 to be as close to the tooth 111 side as possible, while the conductor 122 is slimmer to favor the conductor 122 increasing the area towards the tooth 111. Is formed as possible rectangular shape.

The exciting pole 140 is provided to face the magnet layer 130 between the teeth 111 of the stator 110, the excitation coil 141 is wound around the outer circumferential surface, and the poles are alternately arranged on the magnet layer 130. The magnetization of the magnet layer 130 is performed, and the magnet layer 130 is supplied to the excitation coil 141 by supplying an alternating current of a programmed waveform to change any one or a combination of the width, phase, and amplitude for the magnetization of the magnet layer 130. Magnetize so that the desired number of poles are alternately arranged.

The operation of the pole conversion synchronous motor having such a structure is performed as follows.

The primary induced voltage generated on the stator 110 by applying power to the motor coil 112 wound on the tooth 111 to generate the rotating magnetic flux for driving the pole conversion synchronous motor 100 according to the present invention. Due to this, the rotor 120 is rotated by the start torque generated by the interaction of the secondary induced voltage generated from the conductor 122 of the rotor 120, and at this time, the magnet layer 130 is demagnetized or demagnetized. In this state, the negative torque generated by the magnet layer 130 does not occur during the initial startup, and thus, the degradation of the initial startup performance can be prevented.

When the rotor 120 rotates to reach a constant rotational speed, for example, 75% to 80% of the synchronous speed, the exciting pole 140 is applied to the excitation coil 141 by applying AC power for generating pulses of a pre-programmed waveform. The magnetic poles are formed in the magnet layer 130 so that a predetermined number of N poles and S poles are alternately arranged along the circumferential direction, thereby causing the magnetic flux generated in the magnet layer 130 and the magnetic flux generated in the stator 110. This synchronization is such that the rotational speed of the rotor 120 reaches the synchronous speed. When the rotor 120 reaches the synchronous speed, the AC power applied to the excitation coil 141 is cut off, and the magnet layer 130 maintains the magnetized state, thereby generating continuous driving torque.

Meanwhile, when the magnet layer 130 is magnetized by the exciting pole 140, the inner magnet layer 132 is also magnetized together with the outer magnet layer 131. As a result, the magnetic flux of the magnet layer 131 is increased so that the magnet layer is magnetized. By increasing the magnetizing efficiency of 132, it is possible to reduce the amount of the excitation coil 141.

Therefore, even if the amount of the female coil 141 is reduced, the magnet layer 130 is composed of a double layer of the outer and inner magnet layers 131 and 132 to increase the magnetic flux due to magnetization, thereby minimizing the space where the exciting pole 140 is located. It contributes to make the spacing between the teeth 111 uniform, thereby improving the rotational characteristics of the motor, it is possible to implement high power and high efficiency by increasing the drive torque.

In addition, the inner magnet layer 132 has upper and lower magnet rings 132a and 132b divided into upper and lower magnet grooves 123 and 124 respectively inserted into and fixed to the upper and lower magnet rings 132a. , 132b) does not need to apply excessive force for installation, and avoids excessive expansion, thereby preventing damage caused during assembly of the inner magnet layer 132.

In addition, since the conductor 122 has a rectangular shape, which is advantageous for slimming, the conductor 122 and the inner magnet layer 132 may be located close to the tooth 111, thereby achieving high output and high efficiency.

As described above, the polarized synchronous motor according to the present invention contributes to the uniformity between the teeth by minimizing the space where the exciting pole is located by increasing the magnetic flux of the magnet layer even though the amount of the excitation coil is reduced. It improves the rotational characteristics of the motor, and has the effect of realizing high power and high efficiency by increasing driving torque.

Claims (4)

In the pole conversion synchronous motor, A stator in which a motor coil is wound around a tooth arranged in a plurality; A rotor installed to rotate from the stator and having a plurality of conductors installed along an edge adjacent to an outer circumferential surface thereof; A magnet layer comprising an outer magnet layer installed to have a gap with the tooth on the outer circumferential surface of the rotor, and an inner magnet layer installed inside the conductors in the rotor, and a magnet layer made of a magnetic material capable of remagnetization; An exciting pole provided between the teeth of the stator to face the magnet layer, an excitation coil wound, and magnetizing to alternately arrange poles in the magnet layer. Polar conversion synchronous motor comprising a. The method of claim 1, The inner magnet layer is, Consisting of upper and lower magnet rings inserted into the rotor in an upper side and a lower side, respectively Polar conversion synchronous motor, characterized in that. The method of claim 2, The rotor is, Upper and lower coupling grooves are respectively formed up and down so that the upper and lower magnet rings are respectively mounted Polar conversion synchronous motor, characterized in that. The method of claim 1, The rotor is, The conductors being formed in a rectangular shape Polar conversion synchronous motor, characterized in that.

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