CN111130300B - A high temperature superconducting linear synchronous motor - Google Patents
A high temperature superconducting linear synchronous motor Download PDFInfo
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- CN111130300B CN111130300B CN202010073387.9A CN202010073387A CN111130300B CN 111130300 B CN111130300 B CN 111130300B CN 202010073387 A CN202010073387 A CN 202010073387A CN 111130300 B CN111130300 B CN 111130300B
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 36
- 230000005284 excitation Effects 0.000 claims abstract description 71
- 239000002887 superconductor Substances 0.000 claims abstract description 15
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- 238000000034 method Methods 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 12
- 239000004020 conductor Substances 0.000 claims abstract description 9
- 230000001133 acceleration Effects 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims description 40
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 21
- 229910052802 copper Inorganic materials 0.000 claims description 19
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- 239000000463 material Substances 0.000 claims description 12
- 238000005057 refrigeration Methods 0.000 claims description 7
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 4
- 238000003475 lamination Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002238 attenuated effect Effects 0.000 description 7
- 230000007547 defect Effects 0.000 description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 4
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
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Abstract
本发明公开了一种高温超导直线同步电机，包括定子部件和动子部件，还包括励磁开关，动子部件包括若干个多匝高温超导线圈，相邻的高温超导线圈之间采用反向串联连接，超导线圈两端用于与外部励磁电源相连，励磁开关并联连接在超导线圈两端；利用高温超导体的零电阻特性，通过励磁开关对高温超导线圈进行预励磁使超导线圈带电，高温超导线圈的电流在工作过程中不衰减，降低了导体线圈的损耗以及减小了电机的无功功率，实现了动子线圈无须外加励磁电源的同步运行；高温超导线圈反向串联时，相邻高温超导线圈在行波磁场和动子电流共同作用下产生的推力方向一致，有利于增大动子上的总推力，实现脉冲功率型直线电机快速加速的性能。
The invention discloses a high-temperature superconducting linear synchronous motor, which includes a stator part, a mover part, and an excitation switch. The mover part includes a plurality of multi-turn high-temperature superconducting coils. The two ends of the superconducting coil are connected to the external excitation power supply, and the excitation switch is connected in parallel at both ends of the superconducting coil; using the zero-resistance characteristics of the high-temperature superconductor, the high-temperature superconducting coil is pre-excited through the excitation switch to make the superconducting The coil is charged, and the current of the high-temperature superconducting coil does not decay during the working process, which reduces the loss of the conductor coil and the reactive power of the motor, and realizes the synchronous operation of the mover coil without the need for an external excitation power supply; the high-temperature superconducting coil reverses When connected in series, the thrusts generated by the adjacent high-temperature superconducting coils under the combined action of the traveling wave magnetic field and the mover current are in the same direction, which is beneficial to increase the total thrust on the mover and realize the rapid acceleration performance of the pulse power linear motor.
Description
Technical Field
The invention belongs to the technical field of linear synchronous motors, and particularly relates to a high-temperature superconducting linear synchronous motor.
Background
The pulse power type linear motor can provide high-power thrust in a short time, and short-time high-speed motion of the rotor is achieved, so that short-time high-speed launching requirements of special application occasions such as automobile high-speed collision tests, unmanned aerial vehicle launching, vertical launching and the like are met. At present, from the property of electromagnetic thrust, linear motors mainly comprise linear induction motors and linear synchronous motors. The conventional linear motor has obvious advantages and also has some insurmountable defects.
For example, the secondary stage of the linear induction motor is generally a guide plate, which has the advantages of firm structure, low manufacturing and operating cost and reliable operation, and has the disadvantages that the thrust is reduced along with the increase of the speed, and the power factor is lower; the permanent magnet linear synchronous motor has the advantages of high power factor and efficiency and high thrust density, and has the defects of difficult assembly of permanent magnets and demagnetization risk; the permanent magnet in the permanent magnet linear synchronous motor can be replaced by the electromagnet, but if the synchronous linear motor rotor uses the traditional electromagnet, a large amount of copper wires are necessarily needed, and the copper coil is heavy, occupies a large amount of space, and can generate a large amount of resistance loss.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a high-temperature superconducting linear synchronous motor, and aims to solve the problems of large power loss, low thrust density and complex control of the motor in the prior art.
The invention provides a high-temperature superconducting linear synchronous motor, which comprises: stator part and active cell part still include: the rotor component comprises a plurality of multi-turn high-temperature superconducting coils, the adjacent high-temperature superconducting coils are connected in series in a reverse direction, two ends of each superconducting coil are used for being connected with an external excitation power supply, and the excitation switches are connected to two ends of each superconducting coil in parallel; by utilizing the zero resistance characteristic of the high-temperature superconductor, the high-temperature superconducting coil is pre-excited through the excitation switch to enable the superconducting coil to be electrified, the current of the high-temperature superconducting coil is not attenuated in the working process, the loss of the conductor coil is reduced, the reactive power of the motor is reduced, and the synchronous operation of the rotor coil without an external excitation power supply is realized; when the high-temperature superconducting coils are reversely connected in series, the directions of thrust generated by the adjacent high-temperature superconducting coils under the combined action of the traveling wave magnetic field and the rotor current are consistent, so that the total thrust on the rotor is increased, and the rapid acceleration performance of the pulse power type linear motor is realized.
Still further, the stator component includes a stator core and a stator winding; the stator core is composed of silicon steel sheet transverse laminations, and a group of winding slots which are symmetrically and uniformly arranged by taking a longitudinal central line as a center and are used for accommodating the stator winding are arranged on the stator core. The normal forces generated by the symmetrically arranged bilateral stators can be mutually offset, thereby simplifying the motor control structure.
Furthermore, the stator winding is a copper winding, the rotor coil is made of high-temperature superconducting materials, and the high through-current density of the superconducting wires is far greater than that of the copper wires, so that the motor can generate a larger air-gap magnetic field and generate larger thrust. Meanwhile, due to the zero resistance characteristic of the superconducting wire, the copper consumption generated by the conductor is low, so that the loss of the conductor coil can be reduced, and the reactive power of the motor can be reduced.
Furthermore, the high-temperature superconducting coil can be in a plurality of forms such as a runway type, an oval shape or a rectangular shape, and the like, so that the type and the material are easy to select, and the processing is convenient.
Furthermore, since the magnetic field generated by the superconducting coil is strong and the core is easily saturated, the high-temperature superconducting coil may have an air-core structure.
Further, the excitation switch includes: first switch, second switch and third switch, the stiff end of second switch and the stiff end of third switch are connected respectively at the both ends of high temperature superconducting coil, and the first end a that moves of second switch is used for being connected to the negative pole of excitation power, the first end c that moves of third switch is used for being connected to the positive pole of excitation power, the second of second switch move end b with the second of third switch moves end d and connects, the one end of first switch with the first end a that moves of second switch is connected, the other end of first switch with the first end c that moves of third switch is connected.
Before the stator winding is electrified, the first switch is disconnected, the second switch is connected with the side a, the third switch is connected with the side c, and the excitation power supply is used for supplying constant current to the high-temperature superconducting coil; before the motor runs, the first switch is switched on, the second switch is switched on with the side b, and the third switch is switched on with the side d, so that the high-temperature superconducting coil forms a closed loop along the second switch and the third switch; due to the zero resistance characteristic of the high-temperature superconductor, the current of the rotor excitation loop cannot be attenuated along with time, so that the rotor excitation loop is in an approximately constant current state, and pre-excitation is realized.
When three-phase current is introduced into the stator, the stator winding generates a traveling wave magnetic field in the air gap; the air gap magnetic field generates electromagnetic thrust to the rotor through the combined action of a traveling wave magnetic field generated by the stator winding in the air gap and a rotor excitation magnetic field; under the action of electromagnetic thrust and when the stator is fixed, the rotor moves linearly along the direction of the traveling wave magnetic field.
Further, the stator part has a larger size than the mover part. The linear motor structure of the 'long stator and short rotor' has obvious advantages in occasions where the rotor performs high-speed and high-thrust motion due to the fact that the rotor is light (generally, a whole aluminum plate or copper plate).
Furthermore, the stator component is of a double-side long stator structure, the double-side long stators jointly act on one rotor to generate larger thrust, the double-side long stators are symmetrically arranged, the generated normal forces are mutually offset, and the motor control structure is simplified. The linear motor adopting the double-side-length stator has the advantages of high thrust density, high efficiency, simple structure and the like. And the bilateral long stator adopts copper windings, and has the advantages of mature theory, simple structure, lower cost and the like.
In the linear synchronous motor provided by the invention, the rotor part adopts the high-temperature superconducting coil, the zero resistance characteristic of the high-temperature superconductor is utilized, the high-temperature superconducting coil is pre-excited through the excitation switch to enable the superconducting coil to be electrified, the current of the high-temperature superconducting coil is not attenuated in the working process, the loss of the conductor coil is reduced, the reactive power of the motor is reduced, and the synchronous operation of the rotor coil without an additional excitation power supply is realized.
In the invention, adjacent high-temperature superconducting coils are connected in series in a reverse direction, and when the high-temperature superconducting coils are connected in series in the reverse direction, the directions of thrust generated by the adjacent high-temperature superconducting coils under the combined action of a traveling wave magnetic field and a rotor current are consistent, so that the total thrust on the rotor is increased, and the rapid acceleration performance of the pulse power type linear motor is realized.
The invention further discloses that a group of winding slots which are symmetrically and uniformly arranged by taking the longitudinal central line as the center and are used for accommodating the stator winding are arranged on the stator core in the stator component, and the normal forces generated by the symmetrically arranged bilateral stators can be mutually offset, so that the control structure of the motor is simplified.
Preferably, the rotor coil is made of a high-temperature superconducting material, the stator winding is a copper winding, and the high current density of the superconducting material is far greater than that of a copper wire (generally higher than two orders of magnitude), which means that the motor can generate a larger air gap magnetic field, so as to generate a larger thrust. Meanwhile, due to the zero resistance characteristic of the superconducting wire, the copper consumption generated by the conductor is low, so that the loss of the conductor coil can be reduced, and the reactive power of the motor can be reduced.
Drawings
Fig. 1 is a structural cross-sectional view of a high-temperature superconducting linear synchronous motor according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an excitation switch of a high-temperature superconducting linear synchronous motor according to an embodiment of the present invention.
The same reference numerals in the drawings denote the same physical meanings, wherein 1 denotes a stator core, 2 denotes a stator winding, 3 denotes a high-temperature superconducting coil, 4 denotes an excitation switch, 5 denotes a current lead, and 6 denotes an excitation power supply.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a high-temperature superconducting linear synchronous motor, which can solve the problems of power factor and low thrust density of a pulse power type linear induction motor, difficulty in assembly and control of the pulse power type permanent magnet linear motor and demagnetization risk; the defects of large power loss, low thrust density, complex control and the like of the conventional pulse power type linear motor can be overcome, and the application and further development of the linear motor in special application occasions such as automobile high-speed collision tests, unmanned aerial vehicle ejection, vertical launching and the like are promoted.
The invention applies the superconducting technology to the pulse power type linear motor, can reduce the loss of the coil and improve the power density. Meanwhile, the allowable energy density (closely related to the superconducting stable boundary condition) of the high-temperature superconductor is several orders of magnitude greater than that of the low-temperature superconductor, and the high-temperature superconductor has stronger disturbance resistance. The stator winding adopting the superconducting conductor can generate a larger air gap magnetic field, has small power loss, and is beneficial to reducing the loss of a motor coil and improving the power density. Meanwhile, the requirement of high-temperature superconductivity on low temperature is not as strict as that of low-temperature superconductivity, and the high-temperature superconductivity has the possibility of being applied to pulse power type short-time transmission. These features contribute to the application of high temperature superconducting technology to pulse power type linear motors.
Fig. 1 illustrates a structure of a high-temperature superconducting linear synchronous motor according to an embodiment of the present invention, and for convenience of description, only portions related to the embodiment of the present invention are illustrated, and detailed descriptions are as follows:
the high-temperature superconducting linear synchronous motor provided by the embodiment of the invention comprises: the stator component, the rotor component and the excitation switch; wherein the stator component comprises: stator core 1 and stator winding 2, stator core 1 comprises the horizontal lamination of silicon steel sheet, and stator core 1 opens and has a set of wire winding groove of evenly arranging according to its vertical central line symmetry, is called the tooth's socket to hold stator winding 2, stator winding 2 can be conventional copper winding.
When the motor works, alternating current is introduced into the stator winding 2, alternating magnetic flux is generated, and the changed magnetic flux generates induced current in the stator iron core 1. Induced currents (i.e., eddy currents) generated in the stator core 1 circulate in a plane perpendicular to the direction of the magnetic flux and heat the stator core 1. The stator core 1 can be laminated by adopting transverse silicon steel sheets which are insulated from each other, so that eddy current passes through a smaller section in a long and narrow loop, the resistance on an eddy current path is increased, and the eddy current loss is reduced.
As shown in fig. 2, the mover member is composed of a plurality of multi-turn high-temperature superconducting coils 3, and the end portions of the high-temperature superconducting coils 3 are connected to two copper current lead connectors connected to an excitation power supply.
As an embodiment of the invention, the superconducting coil can be wound by adopting a high-temperature current lead wire, the structure of the coil can adopt various forms such as a runway type, an oval shape and a rectangular shape, the adjacent superconducting coils adopt an inverse series connection form, and the end parts of the superconducting coils are connected on two copper current lead wire joints connected with an excitation power supply 6 by a current lead wire 5. Considering that the magnetic field generated by the superconducting coil is strong and the iron core is easy to saturate, the hollow structure is adopted.
The invention adopts high-temperature superconducting materials to manufacture the coil of the linear motor, and aims to greatly increase the through-current density of a lead, reduce the loss of the coil and improve the power density. The rotor coil is made of high-temperature superconducting materials, the zero resistance characteristic of a high-temperature superconductor is utilized, the superconducting coil is electrified by pre-exciting the superconducting coil, the current of the coil is not attenuated in the working process, and the synchronous operation of the rotor coil without an external excitation power supply can be realized. Meanwhile, the high-speed short-time characteristic of pulse power emission and the critical current magnetic field temperature characteristic of the superconducting material are utilized, the low-temperature operation of the linear motor on the pulse power occasion without external refrigeration equipment can be realized, the weight of the device is reduced, the difficulty of the low-temperature refrigeration technology is reduced, and the power density and the working efficiency of the linear motor are improved.
In the embodiment of the invention, the number of superconducting coils and the number of turns of a single coil are related to factors such as thrust requirements and actual sizes, and the more the number and the number of turns are, the larger the generated thrust is, but the occupied space of the coil is increased, and the cost of the used superconducting coil is correspondingly increased. Therefore, the number of the high-temperature superconducting coils and the number of turns of the high-temperature superconducting coils can be determined according to the performance index of the motor which is used in practice.
In the embodiment of the invention, a rotor coil is made of high-temperature superconducting materials, the superconducting coil is excited by an external excitation power supply before running to electrify the superconducting coil, an excitation switch is closed to directly connect two end parts of the superconducting coil in a short circuit mode, and at the moment, an external excitation power supply circuit can be cut off.
In the linear synchronous motor provided by the invention, the working time of the superconducting coil is very short when the pulse power is transmitted by utilizing the high-speed short-time characteristic of pulse power transmission and the critical current magnetic field temperature characteristic of the superconducting material, and the temperature of the coil in the time period is considered to be basically kept constant. Therefore, as long as the superconducting coil is cooled to below the critical temperature before the motor works, the superconducting coil can keep the superconducting characteristic even if refrigeration equipment is not dragged during the work of the superconducting coil, the low-temperature operation of the linear motor on the pulse power occasion without external refrigeration equipment can be realized, the weight of the device and the low-temperature technical difficulty can be reduced, and the power density and the working efficiency can be improved.
To further illustrate the multi-turn hts 3 provided in the embodiment of the present invention, the following is detailed by taking the case where two hts coils are connected in series in opposite directions as an example:
as shown in fig. 1 and fig. 2, the specific implementation process of the operation of the high-temperature superconducting linear synchronous motor is as follows: before the stator winding is electrified, the rotor superconducting coil is pre-excited, so that the coil of the rotor superconducting coil is in closed-loop circulation of constant direct current in the motion process, and synchronous motion without external direct current power excitation in the emission process is realized. The pre-excitation process is mainly completed by an excitation switch, and the specific process is as follows: before the stator winding is energized, the first switch is turned off, the second switch and the third switch are respectively turned on with the a side and the c side (pre-excitation side), and a constant current is supplied to the high-temperature superconducting coil by the direct-current power supply. Once the starting condition is reached, namely before the motor runs, the first switch is firstly switched on, then the second switch and the third switch are rapidly switched on with the b side and the d side (the self-loop side) respectively, so that the high-temperature superconducting coil forms a closed loop along the second switch and the third switch, and the current of the rotor excitation loop cannot be attenuated along with time due to the zero resistance characteristic of the high-temperature superconductor, so that the rotor excitation loop is in an approximate constant current state, pre-excitation is realized, and in the transmitting process, the superconducting coil can be always kept in an approximate constant current carrying state without an external power supply.
When three-phase current is introduced into the stator, the stator winding generates a traveling wave magnetic field in the air gap. The air gap magnetic field generates electromagnetic thrust to the rotor through the combined action of a traveling wave magnetic field generated by the stator winding in the air gap and the rotor excitation magnetic field. Under the action of the electromagnetic thrust, if the stator is fixed, the rotor moves linearly along the moving direction of the traveling-wave magnetic field.
Wherein, two copper current lead wire connectors connected with the excitation power supply are connected in parallel with two copper current lead wires and are also provided with an excitation switch 4, wherein the excitation switch 4 comprises a plurality of low-resistance switches. As an embodiment of the present invention, as shown in fig. 2, the excitation switch 4 includes: a first switch, a second switch, and a third switch; the fixed end of the second switch and the fixed end of the third switch are respectively connected to two ends of the high-temperature superconducting coil, the first movable end a of the second switch is used for being connected to the negative electrode of the excitation power supply 6, the first movable end c of the third switch is used for being connected to the positive electrode of the excitation power supply 6, the second movable end b of the second switch is connected with the second movable end d of the third switch, one end of the first switch is connected with the first movable end a of the second switch, and the other end of the first switch is connected with the first movable end c of the third switch.
Before the stator winding is electrified, the first switch is disconnected, the second switch is connected with the side a, the third switch is connected with the side c, and the excitation power supply 6 supplies constant current to the high-temperature superconducting coil; before the motor runs, the first switch is switched on, the second switch is switched on with the side b, and the third switch is switched on with the side d, so that the high-temperature superconducting coil forms a closed loop along the second switch and the third switch; due to the zero resistance characteristic of the high-temperature superconductor, the current of the rotor excitation loop cannot be attenuated along with time, so that the rotor excitation loop is in an approximately constant current state, and pre-excitation is realized.
When three-phase current is introduced into the stator, the stator winding generates a traveling wave magnetic field in the air gap; the air gap magnetic field generates electromagnetic thrust to the rotor through the combined action of a traveling wave magnetic field generated by the stator winding in the air gap and a rotor excitation magnetic field; under the action of electromagnetic thrust and when the stator is fixed, the rotor moves linearly along the direction of the traveling wave magnetic field.
In the embodiment of the invention, the stator component can adopt a double-side long stator, wherein the long stator means that the size of the stator is longer than that of the rotor; to further illustrate the high-temperature superconducting linear synchronous motor provided by the embodiment of the present invention, the high-temperature superconducting linear synchronous motor of the present invention is described in detail by taking a double-side long stator as an example as follows:
the high-temperature superconducting linear synchronous motor includes: the double-side long stator, the high-temperature superconducting rotor and the excitation switch are arranged on the two sides of the rotor; the double-side long stator comprises a stator core and a stator winding, and the stator winding is a conventional copper winding. The linear motor structure of the 'long stator and short rotor' has obvious advantages on occasions where the rotor performs high-speed and high-thrust motion due to the fact that the rotor is light (generally a whole aluminum plate or copper plate), and particularly has wide prospects in the fields of automobile collision tests or electromagnetic emission and the like.
Meanwhile, the double-side long stator acts on one rotor together, larger thrust can be generated compared with a single-side stator structure, and normal forces generated by the symmetrically arranged double-side stators can be mutually offset, so that the motor control structure is simplified, and therefore the linear motor adopting the double-side long stator has the advantages of high thrust density, high efficiency, simple structure and the like.
Meanwhile, the double-side long stator adopts the conventional copper winding and has the advantages of mature theory, simple structure, lower cost and the like; the rotor is composed of a plurality of multi-turn high-temperature superconducting coils, the coils can adopt various forms such as a runway type, an ellipse and a rectangle, and the coil form has little influence on the performances such as the thrust of the pulse power type high-temperature superconducting linear synchronous motor.
The adjacent superconducting coils adopt a reverse series connection mode, and the directions of thrust generated by the adjacent superconducting coils under the combined action of a traveling wave magnetic field and a rotor current are consistent when the adjacent superconducting coils are connected in the reverse series connection mode, so that the total thrust on the rotor is increased, and the rapid acceleration performance of the pulse power type linear motor is realized; two ends of the superconducting coil are connected with an external excitation power supply through two copper current leads so as to realize the excitation of the superconducting coil by the external power supply. An excitation switch composed of a plurality of low resistance switches is connected in parallel between the two current leads.
Before the motor works, an external power supply is connected with the superconducting coil by adjusting an excitation switch, so that the superconducting coil is excited by the external power supply, namely, the superconducting coil is pre-excited. When the motor works, the excitation switch is firstly adjusted to disconnect the external power supply from the superconducting coil and form a closed loop with the superconducting coil, and the coil current is not attenuated in the working process by utilizing the zero resistance characteristic of the high-temperature superconductor, so that the synchronous operation of the rotor coil without an external excitation power supply can be realized.
In the embodiment of the invention, the through-current density of the superconducting wire is far greater than that of a copper wire (generally higher than two orders of magnitude), and the superconducting technology is applied to a pulse power type linear motor, so that the loss of a coil is reduced, and the power density is improved. Meanwhile, the allowable energy density (closely related to the superconducting stable boundary condition) of the high-temperature superconductor is several orders of magnitude greater than that of the low-temperature superconductor, and the high-temperature superconductor has stronger disturbance resistance capability, and the characteristics are favorable for applying the high-temperature superconducting technology to the pulse power type linear motor.
The invention adopts high-temperature superconducting material to manufacture the rotor coil, before the rotor coil runs, the superconducting coil is excited by an external excitation power supply to electrify the superconducting coil, the excitation switch is closed to directly connect the two end parts of the superconducting coil in a short circuit, and at the moment, an external excitation power supply circuit can be cut off.
The invention can realize the low-temperature operation of the linear motor in a pulse power occasion without external refrigeration equipment by utilizing the high-speed short-time characteristic of pulse power emission and the critical current magnetic field temperature characteristic of the superconducting material, can reduce the weight of the device and the low-temperature technical difficulty, and improves the power density and the working efficiency.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
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| CN112600383B (en) * | 2021-03-03 | 2021-06-08 | 西南交通大学 | Double-fed linear motor structure with long stator hollow winding and double sides |
| CN115833524A (en) * | 2023-01-09 | 2023-03-21 | 南京邮电大学 | Linear motor based on superconducting cable excitation |
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| CN104019697A (en) * | 2013-03-01 | 2014-09-03 | 北京宇航世纪超导技术有限公司 | Spiral acceleration-type electromagnetic gun system and obtaining method thereof |
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| US6467276B2 (en) * | 2000-02-17 | 2002-10-22 | Lg Electronics Inc. | Pulse tube refrigerator |
| CN101191759B (en) * | 2006-11-20 | 2012-05-23 | 北京航空航天大学 | Ground surface high speed superconductor magnetic levitation sled test device |
| CN105915017A (en) * | 2016-04-15 | 2016-08-31 | 西南交通大学 | Linear traction motor of urban rail |
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| CN104019697A (en) * | 2013-03-01 | 2014-09-03 | 北京宇航世纪超导技术有限公司 | Spiral acceleration-type electromagnetic gun system and obtaining method thereof |
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