阅读说明：本技术 高速磁浮列车的随车控制系统 (Vehicle-mounted control system of high-speed maglev train ) 是由 刘忠臣 于 2015-07-26 设计创作，主要内容包括：本发明提供一种高速磁浮列车的随车控制系统,其特征是：轨道上设置驱动线圈和霍尔传感器接近开关4,驱动线圈8由霍尔传感器接近开关控制接通或断开,列车底部与霍尔传感器接近开关对应位置设置随车永久磁铁或车控电磁线圈作为随车控制系统,随车控制系统可以通过霍尔传感器接近开关直接无接触控制驱动线圈,实现列车对轨道上驱动线圈的直接控制,克服了现有的控制系统需要每隔一段距离设置分电站,使控制系统结构更加简单可靠。(The invention provides a vehicle-mounted control system of a high-speed maglev train, which is characterized in that: set up drive coil and hall sensor proximity switch 4 on the track, drive coil 8 is put through or break off by hall sensor proximity switch control, the train bottom sets up vehicle-mounted permanent magnet or vehicle control solenoid as vehicle-mounted control system with hall sensor proximity switch corresponding position, vehicle-mounted control system can pass through the direct contactless control drive coil of hall sensor proximity switch, realize the direct control of train to drive coil on the track, it needs one section distance at every interval to set up the branch power station to have overcome current control system, make control system structure simple and reliable more.)

1. The utility model provides a vehicle-mounted control system (1) of high-speed maglev train, characterized by: the track is fixedly provided with a driving coil (8), two ends of the driving coil (8) are connected with two paths of solid-state relays (3) or thyristors (3) to be electrically connected with main guide lines on two sides of the track, the track is also provided with a Hall sensor proximity switch (4), and the output end of the Hall sensor proximity switch (4) is electrically connected with the control end of the solid-state relays (3) or thyristors (3); train bottom and hall sensor proximity switch (4) correspond the position and set up on-vehicle permanent magnet (2), the S pole or the N pole of control on-vehicle permanent magnet (2) on the train are towards hall sensor proximity switch (4), hall sensor proximity switch (4) respond to the S pole or the N pole of on-vehicle permanent magnet (2) magnetic field, the solid state relay or thyristor (3) that control corresponds switch on, control drive coil (8) switch-on or disconnection and current direction, drive coil (8) and train bottom pull permanent magnet (6) and form linear electric motor, pull train forward or reverse operation.

2. Onboard control system (1) according to claim 1, characterized in that: the train-mounted permanent magnet is controlled by arranging a traction mechanism on a train control base at the bottom of the train, and the traction mechanism drives a sliding mechanism or a turnover mechanism to change the direction of a magnetic field at the position where the train-mounted permanent magnet (5) approaches a Hall sensor proximity switch (4).

3. The utility model provides a vehicle-mounted control system (1) of high-speed maglev train, characterized by: the track is fixedly provided with a driving coil (8), two ends of the driving coil (8) are connected with two paths of solid-state relays (3) or thyristors (3) to be electrically connected with main guide lines on two sides of the track, the track is also provided with a Hall sensor proximity switch (4), and the output end of the Hall sensor proximity switch (4) is electrically connected with the control end of the solid-state relays (3) or thyristors (3); the train control electromagnetic coil (13) is arranged at the position, corresponding to the Hall sensor proximity switch (4), of the bottom of the train, the S pole or the N pole of the train control electromagnetic coil (13) on the train faces the Hall sensor switch, the Hall sensor proximity switch (4) senses the S pole or the N pole of the magnetic field of the train control electromagnetic coil (13), the corresponding solid-state relay or thyristor (3) is controlled to be conducted, the driving coil (8) is controlled to be connected or disconnected and the current direction is controlled, the driving coil (8) and the traction permanent magnet (6) at the bottom of the train form a linear motor, and the traction train runs in the forward direction or the reverse direction.

4. The onboard control system (1) of a high-speed magnetic-levitation train as claimed in claim 3, characterized in that: the vehicle-mounted control system 1 is composed of 1 row or 2 rows and more than 2 rows of vehicle control electromagnetic coils (13).

5. The onboard control system (1) of a high-speed magnetic-levitation train as claimed in claim 3, characterized in that: the train control electromagnetic coil (13) on the train adopts a programmable controller or a control circuit to control the S pole or the N pole of the train control electromagnetic coil (13) to face the Hall sensor switch, and controls the connection or disconnection of the train control electromagnetic coil (13) and the direction of a magnetic field.

6. An onboard control system (1) according to any one of claims 1-5, characterized in that: the solid-state relay (3) or the thyristor (3) can also be other types of non-contact control switches, such as a silicon controlled rectifier.

7. An onboard control system (1) according to any one of claims 1-5, characterized in that: the Hall sensor proximity switches (4) are arranged in 1 row or 2 rows or more than 2 rows along the driving direction.

8. An onboard control system (1) according to any one of claims 1-5, characterized in that: when 2 rows of Hall sensor proximity switches are arranged on the track, the Hall sensor proximity switches (4) are non-contact sensor switches and comprise capacitance type proximity switches, inductance type proximity switches and reed pipe proximity switches.

9. An onboard control system (1) according to any one of claims 1-5, characterized in that: the Hall sensor proximity switch (4) is linear, namely the Hall sensor proximity switch (4) can feed back the strength of the N pole and the S pole of the magnetic field, output different voltage or current signals and control the strength of the magnetic field after the drive coil (8) on the track is electrified through a control circuit.

10. An onboard control system (1) according to any one of claims 1-5, characterized in that: the driving coil (8) can be an iron core coil or an iron core-free coil.

Technical Field

The invention relates to the technical field of rail transit, in particular to a magnetic suspension train and a control system of a rail, and particularly relates to a control system between a rail driven by a linear motor and a train.

Background

Typical electromagnetic levitation trains which are put into commercial operation at present comprise German EMS electromagnetic levitation systems and Japanese EDS superconducting electric levitation trains, both adopt a synchronous linear motor traction driving technology, a control system of a synchronous linear motor for controlling train running is complex, and the obvious problem exists that two trains in the same driving area section can only be controlled by the same control system, and two trains to be collided cannot move in opposite directions, so that the accident of collision of the two trains is difficult to avoid when the two trains with different speeds relatively move to the same driving area section. The train and the track control system for controlling the running of the train are on the track, sensors for acquiring the relative displacement between the train and the track on the train and the track also need a set of very complex algorithm and computing equipment, and even a remote control technology is needed to transmit communication signals between the train and the track control system, so that the control system has a very complex structure, too many control links appear to be weak in reliability, and the complex control system restricts the development of the magnetic suspension train.

Disclosure of Invention

The invention aims to overcome the defects in the technology and provides a control technology of a magnetic suspension train, which has the advantages of simple structure, reliable performance and low cost.

Technical scheme

The technical scheme adopted by the invention for solving the technical problems is as follows:

a train-mounted control system 1 of a magnetic suspension train is characterized in that: the drive coil 8 is fixedly arranged on the track, two ends of the drive coil 8 are connected with two paths of solid-state relays 3 or thyristors 3 to be electrically connected with main guide lines on two sides of the track, a Hall sensor proximity switch 4 is arranged on the track, the output end of the Hall sensor proximity switch 4 is electrically connected with the control end of the solid-state relays 3 or the thyristors 3, a vehicle-mounted permanent magnet 2 or a vehicle-controlled electromagnetic coil 13 is arranged at the bottom of the train and corresponds to the Hall sensor proximity switch 4 to serve as a vehicle-mounted control system, and the on-off or the on-off and the current direction of the drive coil 8 are directly controlled in a non-contact mode through controlling the magnetic field direction of the vehicle-mounted permanent magnet 2 or the vehicle.

The Hall sensor proximity switches 4 are arranged in 1 row or 2 rows or more than 2 rows along the driving direction.

The vehicle-mounted control system 1 is composed of 1 row or 2 rows and more than 2 rows of vehicle-mounted permanent magnets 2 or vehicle-mounted electromagnetic coils 13.

The Hall sensor proximity switch 4 is a polar Hall sensor proximity switch 4, namely, the N pole and the S pole of the magnet can be subjected to induction feedback, and at least two paths of control signals are output outwards.

The Hall sensor proximity switch 4 is other non-contact sensor switches, including a capacitance type proximity switch, an inductance type proximity switch and a reed pipe proximity switch.

The solid-state relay (3) or the thyristor (3) can also be other types of non-contact control switches, such as a silicon controlled rectifier.

The Hall sensor proximity switch 4 is linear, namely the Hall sensor proximity switch 4 can feed back the strength of the N pole and the S pole of the magnetic field, output different voltage or current signals, and control the strength of the magnetic field after the drive coil 8 on the track is electrified through a control circuit.

The external magnetic pole of the vehicle-mounted permanent magnet 2 is changed to approach the direction of the magnetic field at the hall sensor proximity switch 4 through a sliding mechanism.

The external magnetic pole of the vehicle-mounted permanent magnet 2 changes the direction of the magnetic field close to the Hall sensor proximity switch 4 through the turnover mechanism.

The vehicle-controlled electromagnetic coil 13 is controlled by a programmable controller to be switched on or off and the direction of an external magnetic field of the vehicle-controlled electromagnetic coil 13.

The driving coil 8 can be a cored coil or a coreless coil.

Advantageous effects

The invention has the beneficial effects that:

1. the train controls the train. Control signals are directly sent out on the train, the drive coils on the tracks are directly controlled to work, the train is driven to run, and the substation is not required to be controlled along the line. The synchronous linear motor control technology of the German high-speed electromagnetic levitation train needs to arrange a control substation every hundred meters, and a large number of control substations are arranged along the way to control the train to run. The synchronous linear motor control technology of the japanese superconducting electromagnetic levitation train needs to set a control substation every four hundred meters or more, and although the number is reduced, a large number of control switches and remote control technologies are still needed to transmit communication signals between the train and a control system on a track. The control system is arranged on the train, and a control substation is not required to be arranged along the way, so that a control signal is directly sent out on the train, and a driving coil on a track is directly controlled to work to drive the train to run.

2. The structure is simple. The train-mounted control system is arranged on the train, and the relative position of the train-mounted permanent magnet or the train control coil and the traction magnet at the bottom of the train can be controlled at will and kept relatively fixed, so that a sensor for acquiring the relative displacement between the train and the track is omitted, a remote control technology is not required for transmitting communication signals between the train and the control system on the track, a complex calculation method and calculation equipment are omitted, the structure is greatly simplified, and the manufacturing cost is reduced.

3. The reliability is high. The structure is greatly simplified, a complex intermediate transmission control link is also saved, and the real-time control is free from time delay, so that the reliability is greatly improved.

4. Is more suitable for high-speed control. The control system directly controls the Hall sensor proximity switch on the track on the train to control the work of the drive coil, does not need to collect the sensor at the relative position between the train and the track, and does not need a remote control technology to transmit the communication signal between the train and the control system on the track, so that an intermediate transmission link and complex calculation time are saved, and the control can be carried out in real time in the shortest time.

5. The operation and control are free. Even if the trains on the tracks in the same section can control the speed and the running direction of the trains at will like the conventional wheel track high-speed rail at present, the trains can also run in a mutually avoiding way, and can be close to each other and linked to form a train, and any problem in running can be automatically controlled and solved.

6. And energy-saving control is realized. The control system on the train adopts the permanent magnet as the control element, and after the control command was sent, the permanent magnet can keep the work of power consumption's control drive coil, practices thrift the control energy. The electrifying direction of the main conducting wire on the track is always kept unchanged, only the current direction of the driving coil is changed, repeated impact of current reversing of the main conducting wire is reduced, and compared with the conventional method that the direction of variable alternating current of each main conducting wire is controlled by a power distribution station on the track, the method is more energy-saving, and the service life of electrical components is prolonged.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic diagram of the operating principle of the single row onboard control system unit of the present invention.

FIG. 2 is a schematic side view of a single row onboard control system according to an embodiment of the present invention.

Fig. 3 is a schematic perspective view of an embodiment of the single-row onboard control system of the present invention.

Fig. 4 is a schematic diagram of the operating principle of the dual bank onboard control system unit of the present invention.

Fig. 5 is a schematic perspective view of an embodiment of the dual-row onboard control system of the present invention.

Fig. 6 is a bottom view of the glide mechanism of the onboard control system of the present invention.

In the figure, 1-vehicle control system, 2-vehicle permanent magnet, 3-thyristor or solid-state relay, 4-Hall sensor proximity switch, 5-line conductor, 6-traction permanent magnet of train, 7-iron core, 8-driving coil, 9-main conductor, 10-sleeper, 11-insulating box, 12-roadbed or box girder, 13-vehicle control electromagnetic coil, 14-vehicle control base, 15-train, 16-train bent arm, 17-suspension plate, 18-sliding mechanism and slideway, and 19-steel rail.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, the working principle of the onboard control system 1 of the present invention is disclosed, two sides of the track are provided with main conducting wires 9, one side of the main conducting wire 9 is the positive pole of the power supply, and the other side of the main conducting wire is the negative pole of the power supply. The fixed driving coil 8 is arranged on the track, the traction permanent magnet 6 is arranged at the bottom of the driving coil 8 at a certain distance, the traction permanent magnet 6 is fixedly connected to the bottom of the train, and the fixed driving coil 8 and the traction permanent magnet 6 form a linear motor. Each group of driving coils 8 is composed of a plurality of sub-coils which are connected in series to form a group of driving coils 8, two ends of each group of driving coils 8 are connected with two paths of solid relays 3 which are electrically connected with main guide lines 9 on two sides of the track, the solid relays 3 can also be thyristors 3, and the track is provided with a row of Hall sensor proximity switches 4. The hall sensor proximity switch 4 is polarized, i.e. can sense the N pole and S pole of the magnet, and has OUT1 and OUT2 output signals respectively. The vehicle-mounted permanent magnet 2 is arranged at the position, corresponding to the Hall sensor proximity switch 4, of a vehicle control base 14 at the bottom of the high-speed train 15, and the vehicle-mounted permanent magnet and the Hall sensor proximity switch together form a vehicle-mounted control system 1. When the south pole of the onboard permanent magnet 2 at the bottom of the train 15 faces the hall sensor proximity switch 4, the output end OUT1 of the hall sensor proximity switch 4 sensing the south pole outputs a control signal to control the corresponding pair of solid-state relays 3 (in fig. 1, a and C) to be conducted, the driving coil 8 on the track is electrified positively, and the driving coil is transmitted to the traction permanent magnet 6 at the bottom of the train to generate the required traction force. After the train moves for a certain distance, the direction of the traction permanent magnet 6 at the bottom of the train 15 changes at the next group of driving coils 8, the N pole of the vehicle-mounted permanent magnet 2 at the bottom of the train is close to the Hall sensor proximity switch 4, the output end OUT2 of the induction N pole on the Hall sensor proximity switch 4 outputs a control signal to control the conduction of the corresponding other pair of solid-state relays 3 (B and D in the figure 1), and the driving coils 8 on the track are electrified reversely to transmit the traction force in the same direction to the traction permanent magnet 6 on the train. Thus, the vehicle runs in the required driving direction continuously in a circulating way. The driving coil 8 on the track is controlled to be switched on or switched off by the vehicle-mounted permanent magnet 2 at the bottom of the train, so that the train 15 directly controls the driving coil 8 on the track. As long as the direction of the external magnetic poles of the onboard permanent magnets 2 at the bottom of the train and the arrangement position of the on-off state are controlled, the direction of the traction force of the driving coil 8 can be controlled in a non-contact manner through the Hall sensor proximity switch 3 on the track.

The typical application of the onboard control system in high-speed rail transit is further explained with reference to the attached drawings.

To facilitate viewing and understanding of the principles of operation of the onboard control system of the present invention, the train body, rails and mechanical linkages of the shelter control system have been omitted from fig. 3. As shown in fig. 2 and 3, the two sides of the roadbed 12 are fixedly provided with main conducting wires 9 by insulators, one side of the main conducting wire is the anode of the power supply, and the other side of the main conducting wire is the cathode of the power supply. The track is provided with a fixed driving coil 8, the bottom of the driving coil 8 is provided with a traction permanent magnet 6 at a certain distance, the traction permanent magnet 6 is fixedly connected to a suspension plate 17 at the bottom of the train 15, and the driving coil 8 and the traction permanent magnet 6 at the bottom at a certain distance form a permanent magnet linear motor. Each group of driving coils is composed of a plurality of sub-coils, the driving coils 8 of the tracks on the two sides can be mutually connected in series to form a group of driving coils 8, and two ends of each group of driving coils 8 are connected with two paths of solid relays 3 and then are electrically connected with the main leads 9 on the two sides of the track bed 12. The center of the track is provided with a row of Hall sensor proximity switches 4. The hall sensor proximity switch 4 is capable of distinguishing the polarity of the magnetic field, namely sensing the N pole and the S pole of the magnetic field, and has output signals of OUT1 and OUT2 respectively. The vehicle-mounted permanent magnet 2 is arranged at the bottom of the high-speed train 15 and at the position corresponding to the Hall sensor proximity switch 4, and the vehicle-mounted permanent magnet and the Hall sensor proximity switch together form a vehicle-mounted control system 1. When the S pole of the vehicle-mounted permanent magnet 2 at the bottom of the train 15 is close to the Hall sensor proximity switch 4, the output end OUT1 of the sensing S pole on the Hall sensor proximity switch 4 outputs a control signal to control the conduction of the corresponding pair of solid-state relays 3, the driving coil 8 on the track is electrified in the forward direction and is transmitted to the traction permanent magnet 6 at the bottom of the train, and the traction force in the traveling direction is generated. After the train moves for a certain distance, the direction of the traction permanent magnet 6 at the bottom of the train 15 changes at the next group of driving coils 8, the N pole of the vehicle-mounted permanent magnet 2 at the bottom of the train 15 is close to the Hall sensor proximity switch 4, an output end OUT2 of the induction N pole on the Hall sensor proximity switch 4 outputs a control signal to control the corresponding other pair of solid-state relays 3 to be conducted, and the driving coils 8 on the track are electrified reversely to transmit the traction force which is in the same direction as the traction permanent magnet 6 at the bottom of the train. Thus, the vehicle runs in the required driving direction continuously in a circulating way. The driving coil 8 on the track is controlled to be switched on or switched off by the vehicle-mounted permanent magnet 2 at the bottom of the train, so that the train 15 directly controls the driving coil 8 on the track. As long as the direction of the external magnetic poles of the onboard permanent magnets 2 at the bottom of the train and the arrangement position of the on-off state are controlled, the direction of the traction force of the driving coil 8 can be controlled in a non-contact manner through the proximity switch 3 of the Hall sensor, so that the acceleration and the deceleration of the train are realized, and the regenerative power generation and braking of the train can also be realized.

The relative position of the on-board control system formed by the on-board permanent magnet 2 and the traction permanent magnet 6 on the train keeps synchronous, and the train is drawn to run according to the control mode of the permanent magnet synchronous linear motor.

As shown in fig. 3, the onboard permanent magnet 2 may be a vehicle-controlled electromagnetic coil 13, and the vehicle-controlled electromagnetic coil 13 is an electromagnetic coil with an iron core and is mounted on a vehicle-controlled base 14 at the bottom of the train, and corresponds to the position of the hall sensor proximity switch 4 on the sleeper 10. The vehicle control solenoid 13 may be controlled by a programmable controller on the train. The programmable controller can conveniently control the on or off of the vehicle-control electromagnetic coil 13, and can also control the NS magnetic field direction of the external magnetic field after the vehicle-control electromagnetic coil 13 is electrified through the control circuit. The Hall sensor proximity switch 4 is a polar Hall switch, can sense the N pole or S pole of an external magnetic field of the vehicle control electromagnetic coil 13, respectively outputs two paths of output control signals, and controls the solid-state relay 3 on the track to realize the NS polarity of the magnetic field of the driving coil 8 on the track relatively pulling the permanent magnet 6. The NS polarity of the external magnetic field of the driving coil on the track can be controlled by controlling the NS polarity of the external magnetic field of the vehicle-controlled electromagnetic coil 13, so that the traction power and the traveling direction of the train are controlled.

In order to more easily understand the working principle of the invention, the invention provides a working principle diagram of a double-row control system.

As shown in fig. 4 and 5, a tie 11 is provided on the top of a roadbed or a box girder 12, rails 19 are fixedly provided on both sides of the tie 11 with fasteners, and a train 15 runs on a track. The two sides of the track are provided with main guide lines 9, one side of the main guide line is the anode of the power supply, and the other side of the main guide line is the cathode of the power supply. The driving coils 8 are fixedly arranged on the track, each group of driving coils is composed of a plurality of sub-coils and is connected in series to form a group of driving coils 8, one end of each group of driving coils 8 is connected with two thyristors 3 to be electrically connected with the positive pole of the main conductor, and the other end of each group of driving coils 8 is also connected with two thyristors 3 to be electrically connected with the negative pole of the main conductor. The thyristor 3 may also be another type of switch, such as a thyristor. Two rows of Hall sensor proximity switches 4 are arranged on the track, and two rows of corresponding vehicle-mounted permanent magnets 2 are arranged. The bottom of the high-speed train 15 is provided with a vehicle-mounted permanent magnet 2 serving as a vehicle-mounted control system, the vehicle-mounted permanent magnet 2 corresponds to the Hall sensor proximity switch 4 in position, and the Hall sensor proximity switch 4 induces the vehicle-mounted permanent magnet 2 at the bottom of the train to connect the corresponding thyristor 3, so that the corresponding driving coil 8 is electrified. When a magnetic pole (such as an S pole) on one side of the vehicle-mounted permanent magnet 2 at the bottom of the train 15 approaches the Hall sensor approach switch 4, the output end of the Hall sensor approach switch 4 sensing the S pole outputs a control signal to control the conduction of the corresponding pair of thyristors 3, and the driving coil 8 on the track is electrified in the positive direction and transmits the driving force to the train. After the train moves for a certain distance, the position of the traction permanent magnet 6 at the bottom of the train 15 is changed, when the magnetic pole (such as N pole) of the vehicle-mounted permanent magnet 2 at the other side of the bottom of the train 15 approaches the Hall sensor approach switch 4, the output end of the Hall sensor approach switch 4 sensing the N pole outputs a control signal to control the conduction of the other corresponding pair of thyristors 3, and the driving coil 8 on the track is reversely electrified and transmits the control signal to the same-direction traction force required by the train. Thus, the vehicle runs in the required driving direction continuously in a circulating way. The driving coil 8 on the track is controlled to be switched on or switched off by the on-board permanent magnet 2 at the bottom of the train to induce the Hall sensor proximity switch 3, so that the direct control of the driving coil 8 on the track by the train 15 is realized.

When two rows of hall sensor proximity switches 4 are disposed on the track, the hall sensor proximity switches 4 may be other simple non-contact sensor switches, including capacitive proximity switches, inductive proximity switches, and reed pipe proximity switches, for example.

The hall sensor proximity switch 4 can also adopt a linear hall sensor proximity switch 4, namely the hall sensor proximity switch 4 can also sense and feed back the strength of the N pole and the S pole of the magnet, output different voltage or current signals and control the strength of the magnetic field of the track after the drive coil 8 is electrified through a control circuit.

As shown in fig. 6, the outward magnetic poles of the onboard permanent magnet 2 realize the change of the directions of the magnetic poles at the proximity switch 4 of the corresponding hall sensor in a sliding manner. A slide way 18 is arranged on a vehicle control base 14 at the bottom of the train, the vehicle-mounted permanent magnet 2 can move along the slide way, and the sliding of the vehicle-mounted permanent magnet 2 is controlled by a sliding traction mechanism. When the S pole of the onboard permanent magnet 2 slides to be close to the Hall sensor proximity switch 4, the driving coil 8 is switched on in the positive direction; when the N pole of the onboard permanent magnet 2 slides to be close to the Hall sensor proximity switch 4, the driving coil 8 is reversely switched on; when the N-pole and S-pole of the onboard permanent magnet 2 both slide away from the hall sensor proximity switch 4, the drive coil 8 is disconnected from the main conductor 9.

The outward magnetic poles of the vehicle-mounted permanent magnet 2 can also change the direction of the magnetic poles outward through the turnover mechanism.

The driving coil 8 may be provided with an iron core 7 inside. The bottom of the iron core 7 and the bottom of the driving coil 8 are provided with the traction permanent magnet 6 at a certain distance, the traction permanent magnet 6 is fixed at the bottom of the train, and the iron core 7 and the driving coil 8 form an iron core permanent magnet linear motor with the traction permanent magnet 6 at a certain magnetic gap with the bottom, so that the external traction force is larger.

The driving coil 8 may be a coreless coil, and forms a coreless permanent magnet linear motor with the traction permanent magnet 6.

The driving coil 8 can be a ring coil or a serpentine coil.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.