KR20080081414A - Pole change type synchronous motor - Google Patents

Abstract

A pole changing type synchronous motor is provided to increase an amount of a motor coil wound around a tooth by minimizing interference with the motor coil. A pole changing type synchronous motor(100) includes a stator(110), a rotor(120), a magnet layer(130), an exciting pole(140), and an exciting coil winding groove(150). In the stator, motor coils(112) are wound around a plurality of teeth(111). The rotor is installed to rotate from the stator and includes a plurality of conductors(122). The magnet layer is installed to have the teeth and pores at the rotor and is made of magnetic material which is magnetized again. The exciting pole is positioned between the teeth of the stator to face the magnet layer and performs magnetization to arrange poles on the magnet layer alternately. An exciting coil(141) is wound around the exciting pole. The exciting coil winding groove is formed at an outer circumferential surface of the exciting pole to increase an amount of the exciting coil wound around the exciting pole.

Description

Pole CHANGE TYPE SYNCHRONOUS MOTOR

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

FIG. 2 is a plan sectional view showing a pole conversion synchronous motor according to a first embodiment of the present invention.

3 is a plan sectional view showing a pole conversion synchronous motor according to a second embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

110,210: Stator 111,211: Tooth

112,212: Motor coil 120,220: Rotor

121: shaft hole 122,222: conductor

130,230 magnet layer 140,240: exciting pole

141,241: Female coil 150,250: Female coil winding home

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pole conversion synchronous motor, and more particularly, to a pole conversion synchronous motor capable of increasing the amount of excitation coil wound on an exciting pole without changing the structure or position of the tooth.

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 initial startup and thus has a disadvantage of degrading the performance of the initial startup.A pole called WPM (Written Pole Motor) is used to overcome this disadvantage. 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 includes a stator 11 and a stator 11 in which a plurality of teeth 11b, each of 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 has to wind as many exciting coils 14a as desired on the exciting pole 14 in order to have a magnetic pole of a desired intensity in the magnet layer 13. Of course, a high current must be applied to the exciting pole 14, and the exciting pole 14 is located between the teeth 11b, which limits the amount of winding coils 14a that are wound. Increasing the applied voltage not only causes power consumption more than necessary, but also causes an increase in the size of the motor. The excitation coil 14a wound around the exciting pole 14 is wound around the motor coil 11a wound on the tooth 11b. By causing interference, there was a problem such as having a limit in increasing the amount of winding of the motor coil (11a).

The present invention is to solve the above-described problems, an object of the present invention is to increase the amount of excitation coil wound on the exciting pole without changing the structure or position of the tooth to reduce the consumption of power applied to the exciting pole. In addition to reducing the size of the motor, and contribute to reducing the size of the motor coil wound on the tooth by providing a pole-conversion synchronous motor that can easily increase the amount of motor coil wound on the tooth.

The present invention for achieving the above object is, in a pole-conversion synchronous motor, a stator in which a motor coil is wound around a plurality of teeth arranged, a rotor installed to rotate from the stator, and a rotor having a plurality of conductors installed therein, It is installed to have a gap with the tooth, and is provided with a magnet layer made of a magnetic material that can be remagnetized, and is provided to face the magnet layer between the teeth of the stator, the coil is wound, and the magnetization is arranged to alternately arrange the poles in the magnet layer. It comprises an exciting pole to be carried out, and an excitation coil winding groove formed on the outer circumferential surface of the exciting pole to increase the amount of winding of the excitation coil wound on the exciting pole.

In addition, the present invention is a pole-converted synchronous motor, a stator in which a motor coil is wound on a plurality of teeth arranged to rotate, a rotor installed to rotate from the stator, and a rotor having a plurality of conductors installed, so that the rotor has a tooth and a gap A magnet layer made of a magnetic material which is installed and can be remagnetized, and an exciting pole which is provided to face the magnet layer between the teeth of the stator, the coil is wound, and magnetizes to alternately arrange the poles on the magnet layer, In order to increase the amount of winding of the excitation coil wound on the exciting pole is characterized in that it comprises an excitation coil winding groove formed in a portion adjacent to the exciting pole on the inner surface of the stator.

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 plan sectional view showing a polar conversion synchronous motor according to a first embodiment of 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 rotor 120 in which a plurality of conductors 122 are installed, a magnet layer 130 that is installed in the rotor 120 and made of a remagnetizable magnetic material, and a coil coil 141 are wound. An excitation pole 140 for magnetizing the magnet layer 130 and an excitation coil winding groove 150 formed on an outer circumferential surface of the exciting pole 140 to increase the amount of winding of the excitation coil 141.

The pole conversion 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 is fixed to a shaft (not shown) in the shaft hole 121 formed at the center thereof, and the shaft (not shown) is rotatable from the stator 110 by being coupled to a case such as a housing or a shell through a bearing. A plurality of conductors such as aluminum (Al), copper (Cu), or the like are inserted into the circumference of the shaft hole 121, and a magnet layer 130 is installed on an outer circumferential surface thereof.

The magnet layer 130 is made of a magnetic material capable of remagnetization, and may be made of a hard magnetic material as well as a soft magnetic material. The magnet layer 130 has a ring shape and is fitted to the outer circumferential surface of the rotor 120 to have a gap with the tooth 111. .

The exciting pole 140 is provided to face the magnet layer 130 between the teeth 111 of the stator 110, and the female coil 141 is wound around the female coil winding groove 150 provided on the outer circumferential surface thereof. The magnetization is performed to alternately arrange the poles in the layer 130. The magnetization of the magnet layer 130 is programmed to change any one or a combination of width, phase, and amplitude to the excitation coil 141. By supplying the alternating current of the waveform, the magnet layer 130 is magnetized so that the desired number of poles are alternately arranged.

The female coil winding groove 150 is provided on the outer circumferential surface of the exciting pawl 140 in this embodiment so as to increase the amount of the winding coil 141 instead of reducing the thickness of the exciting pawl 140. , Thereby minimizing interference with the motor coil 112 wound on the tooth 111, thereby helping to increase the winding amount of the motor coil 112 as well as the winding of the excitation coil 141 or the motor coil 112. There is no need to increase the size of the motor with increasing dose.

3 is a plan sectional view showing a pole conversion synchronous motor according to a second embodiment of the present invention. As again, the pole conversion synchronous motor 200 according to the present embodiment has a stator 210, a rotor 220, a magnet layer 230, an exciting pole 240, like the first embodiment. Unlike the first embodiment, in order to increase the amount of winding of the excitation coil 241 in which the excitation coil winding groove 250 is wound on the exciting pole 240, the exciting pole 240 is adjacent to a portion adjacent to the inner side of the stator 210. Is formed. Accordingly, the winding amount of the excitation coil 241 may be increased while the inside of the stator 210 maintains the thickness of the exciting pole 240 by burdening the volume of the excitation coil 241 by the excitation coil winding groove 250. To help.

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 and 210 by generating a rotating magnetic flux by applying power to the motor coils 112 and 212 wound on the teeth 111 and 211 to drive the pole conversion synchronous motors 100 and 200 according to the present invention. Therefore, the rotors 120 and 220 are rotated by the start torque generated by the interaction of the secondary induced voltages generated from the conductors 122 and 222 of the rotors 120 and 220, and the magnet layers 130 and 230 are demagnetized to demagnetized. In this state, the negative torque caused by the magnet layers 130 and 230 may not be generated during the initial startup, thereby preventing the degradation of the initial startup performance.

When the rotors 120 and 220 reach a constant rotational speed, for example, 75% to 80% of the synchronous speed, the excitation poles 140 and 240 are applied to the excitation coils 141 and 241 by applying an AC power to generate pulses of a pre-programmed waveform. The magnetic poles are formed in the magnet layers 130 and 230 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 layers 130 and 230 and the magnetic flux generated in the stators 110 and 210. This synchronization is achieved so that the rotational speed of the rotors 120 and 220 reaches the synchronous speed. When the rotors 120 and 220 reach the synchronous speed, the AC power applied to the excitation coils 141 and 241 is cut off, and the magnet layers 130 and 230 maintain the magnetized state, thereby generating continuous driving torque.

Meanwhile, as in the first embodiment, the female coil winding grooves 150 and 250 are formed on the outer circumferential surface of the exciting pawl 140 or the inner side of the stator 210 adjacent to the exciting pawl 240 as in the second embodiment of the tooth 111, 211. It is possible to increase the amount of winding the excitation coil (141,241) without changing the position or structure, thereby reducing the voltage applied to the exciting pole (140,240) for magnetization of the magnet layer (130,230), consumption of power In order to reduce the size and increase the amount of windings of the excitation coils 141 and 241, the motor does not have to be large, thereby contributing to the size reduction of the motor.

In addition, the excitation coils 141 and 241 wound by the excitation coil winding grooves 150 and 250 minimize the interference with the motor coils 112 and 212 so that the winding amount of the motor coils 112 and 212 can be easily increased as necessary.

As described above, the pole conversion synchronous motor according to the present invention can reduce the consumption of power applied to the exciting pole by increasing the amount of the excitation coil wound on the exciting pole without changing the structure or position of the tooth. In addition, it contributes to reducing the size of the motor, and has the effect of easily increasing the amount of motor coil wound on the tooth by minimizing interference with the motor coil wound on the tooth.

What has been described above is just one embodiment for implementing a pole conversion type synchronous motor according to the present invention, and the present invention is not limited to the above-described embodiment, and as claimed in the following claims, the gist of the present invention Without departing from the technical spirit of the present invention to the extent that any person of ordinary skill in the art to which the present invention pertains various modifications can be made.

Claims (2)

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 therein; A magnet layer installed in the rotor to have a gap with the tooth and made of a magnetic material capable of remagnetization; An exciting pole provided between the teeth of the stator to face the magnet layer, the excitation coil being wound, and magnetizing to alternately arrange poles in the magnet layer; Excitation coil winding groove formed on the outer circumferential surface of the exciting pole to increase the amount of winding of the excitation coil wound on the exciting pole Polar conversion synchronous motor comprising a. 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 therein; A magnet layer installed in the rotor to have a gap with the tooth and made of a magnetic material capable of remagnetization; An exciting pole provided between the teeth of the stator to face the magnet layer, the excitation coil being wound, and magnetizing to alternately arrange poles in the magnet layer; Excitation coil winding groove formed in a portion adjacent to the exciting pawl on the inner side of the stator in order to increase the amount of winding of the excitation coil wound on the exciting pawl Polar conversion synchronous motor comprising a.

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