CN215097038U - Eddy current braking system - Google Patents
Eddy current braking system Download PDFInfo
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- CN215097038U CN215097038U CN202121572689.7U CN202121572689U CN215097038U CN 215097038 U CN215097038 U CN 215097038U CN 202121572689 U CN202121572689 U CN 202121572689U CN 215097038 U CN215097038 U CN 215097038U
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Abstract
The utility model provides an eddy current braking system, include: an eddy current braking device; a first power supply circuit in controllable electrical connection with the eddy current braking device, comprising: the traction system comprises a traction system main loop and an excitation power supply electrically connected with the traction system main loop; a second power supply circuit in controllable electrical connection with the eddy current braking device, comprising: a power supply assembly electrically connected to the eddy current braking device; the power supply control module is electrically connected with the first power supply loop and the second power supply loop; the power supply control module selects a power supply loop for supplying power to the eddy current brake device according to loop states of the first power supply loop and the second power supply loop during emergency braking. The eddy current braking system can improve the reliability of eddy current braking power supply and meet the requirement of emergency braking.
Description
Technical Field
The utility model belongs to the technical field of rail vehicle braking, concretely relates to eddy current braking system for high-speed train.
Background
The braking technology is a key technology for restricting the highest running speed of the train and guaranteeing the running safety. According to the fact that kinetic energy increases with the increase of the speed of the train in the power of 2, the burden of increasing the running speed to a braking system is large. At present, a composite braking mode of friction braking and dynamic braking is commonly adopted by high-speed trains in the world, and the position of the generated braking force still belongs to an adhesion braking mode, namely the generation of the final braking force depends on the adhesion between wheel rails. As the speed of the train increases, the wheel-rail adhesion coefficient gradually decreases, and it is difficult for the adhesion brake to exert a sufficient braking force in a high-speed section. Therefore, when the train is further accelerated, the kinetic energy is greatly increased, and the adhesion braking force is reduced at a high speed, so that the braking distance is greatly increased only by adopting the adhesion braking method. In order to reduce the braking distance and ensure the operation safety, the rail transit field is always developing novel non-adhesive braking technologies, such as linear eddy current braking, magnetic rail braking, wind resistance braking and the like.
The basic principle of linear eddy current braking is that a closed magnetic loop is formed by electromagnets with alternately arranged magnetic poles and a steel rail, and when the electromagnets and the steel rail move relatively, electric eddy currents are generated on the surface of the steel rail and electromagnetic component force opposite to the moving direction is formed under the action of a magnetic field. Because of the following salient features, linear eddy current braking is regarded as a new technology with great popularization prospect: (1) the braking force is generated on the linear eddy current braking device and is directly transmitted to the bogie, is not limited by the condition of wheel rail adhesion, and can be used as the supplement of the traditional braking mode; (2) the braking force output at the high-speed stage is considerable and stable, and the braking distance can be effectively shortened; (3) the brake device is not in contact with the steel rail, has no abrasion and noise, and is green and environment-friendly; (4) by controlling the exciting current, the braking force can be adjusted. The ICE3 train in germany has now become the first vehicle model in the world to be mass-equipped with a linear eddy current braking system.
The linear eddy current brake system generally comprises a linear eddy current brake device, an excitation power supply and an eddy current control unit, wherein the excitation power supply can be integrated with the traction unit or form an independent unit, and the eddy current brake control unit can be integrated with the brake control unit or form an independent unit. Because the eddy current braking excitation power consumption is large, the existing power supply mode of the eddy current braking system developed at home and abroad generally gets electricity from a traction intermediate direct current circuit, and the electricity is output to an eddy current braking device after being adjusted by an excitation power supply. The complete power supply loop of the power supply mode has a complex structure, and relates to functional modules such as a contact network, a transformer, a traction converter, an excitation power supply and the like, and the problem of any link can result in that the power cannot be normally supplied to the eddy current brake device.
Therefore, the current eddy current brake power supply mode applied in the market cannot meet the safety level requirement of safety brake, and the eddy current brake cannot be used as the safety brake. For example, german ICE3 train eddy current braking systems are generally only applied to service braking or quick braking.
Emergency braking is used as the last barrier for guaranteeing safe braking of the train, and the emergency braking system is required to have a high enough integrity level. Theoretically, all available braking resources can be invested in emergency braking to reduce the actual parking distance, but in order to guarantee safety, the emergency braking distance is required to be ensured by the braking function which has the function safety and the highest integrity level in all the available braking resources.
The technology of the braking device and the control unit in the eddy current braking system is mature, and the related safety level requirements are relatively easy to realize. However, as mentioned above, the current architecture is complex and difficult to meet the requirements of safety braking. Therefore, it is a necessary condition to make the eddy current brake meet the emergency braking requirement to improve the safety level of the eddy current brake power supply.
SUMMERY OF THE UTILITY MODEL
In view of the above insufficiency of the prior art, the present invention has an object to provide an eddy current braking system to improve the reliability of the eddy current braking power supply and satisfy the emergency braking requirement.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an eddy current braking system comprising:
an eddy current braking device;
a first power supply circuit in controllable electrical connection with the eddy current braking device, comprising: the traction system comprises a traction system main loop and an excitation power supply electrically connected with the traction system main loop;
a second power supply circuit in controllable electrical connection with the eddy current braking device, comprising: a power supply assembly electrically connected to the eddy current braking device;
the power supply control module is electrically connected with the first power supply loop and the second power supply loop; the power supply control module selects a power supply loop for supplying power to the eddy current brake device according to loop states of the first power supply loop and the second power supply loop during emergency braking.
In a preferred embodiment, the power supply control module selects the second power supply circuit to supply power to the eddy current braking device and cuts off the electrical connection between the excitation power supply and the eddy current braking device when the first power supply circuit is in the unavailable state.
In a preferred embodiment, a first switch for controlling on-off is arranged between the excitation power supply and the traction system main loop in the first power supply loop; and a second switch for controlling on-off is arranged between the eddy current braking device and the excitation power supply.
As a preferred embodiment, the traction system main loop comprises a transformer connected with a contact system and grounded, four quadrants electrically connected with the transformer, an intermediate loop electrically connected with the four quadrants, and a traction motor assembly electrically connected with the intermediate loop; the excitation power supply is electrically connected with the intermediate circuit; the first switch controls the on-off between the excitation power supply and the intermediate loop.
In a preferred embodiment, the power supply module includes a battery electrically connected to the eddy current braking device, and a charging device electrically connected to the battery; the charging device is connected with the intermediate loop; a third switch for controlling on-off is arranged between the charging device and the intermediate loop; a fourth switch for controlling the on-off is arranged between the storage battery and the eddy current braking device;
and the power supply control module closes the third switch when the storage capacity of the storage battery is lower than a preset value and the fourth switch is in an open state, and controls the charging device to charge the storage battery.
In a preferred embodiment, the electrical connection position of the power supply module to the eddy current braking device is located between the second switch and the eddy current braking device; the electric connection position of the charging device and the intermediate circuit is located between the first switch and the intermediate circuit.
In a preferred embodiment, the first switch is an excitation power input contactor electrically connected to the power control module; the second switch is an excitation power supply output contactor electrically connected with the power supply control module; the fourth switch is a storage battery output contactor electrically connected with the power supply control module; wherein the power control module comprises: a first interlock control unit capable of closing only one of the excitation power supply output contactor and the battery output contactor when braking is performed in response to turning on the eddy current brake device.
As a preferred embodiment, the traction motor assembly includes an inverter connected to the intermediate circuit, and a traction motor electrically connected to the inverter;
the power supply assembly comprises the rectifying and filtering device electrically connected with the traction motor; the rectifying and filtering device is electrically connected with the eddy current braking device; a fifth switch for controlling on-off is arranged between the traction motor and the inverter; a sixth switch for controlling on-off is arranged between the rectifying and filtering device and the traction motor; and a seventh switch for controlling the on-off is arranged between the rectifying and filtering device and the eddy current braking device.
In a preferred embodiment, the first switch is an excitation power input contactor electrically connected to the power control module; the second switch is an excitation power supply output contactor electrically connected with the power supply control module; the fifth switch is an inverter output contactor electrically connected with the power supply control module; the sixth switch is a rectification filtering input contactor electrically connected with the power supply control module; the seventh switch is a rectification filtering output contactor electrically connected with the power supply control module;
wherein the power control module comprises: a second linkage control section capable of closing only one of the excitation power supply output contactor and the rectification filter output contactor when braking is performed in response to turning on the eddy current braking device, and a third linkage control section disconnecting the inverter output contactor and closing the rectification filter input contactor when the traction motor supplies power to the eddy current braking device.
In a preferred embodiment, the traction motor is a permanent magnet motor.
Has the advantages that:
the utility model provides an eddy current braking system is equipped with first power supply circuit and the second power supply circuit to the power supply of eddy current arresting gear to utilize power control module basis first power supply circuit with the loop status of second power supply circuit selects to the power supply circuit of eddy current arresting gear power supply, and then can select another power supply circuit to supply power when emergency braking appears under the condition that one of them power supply circuit became invalid and implement eddy current braking, thereby the utility model discloses an eddy current braking system can show improvement system power supply reliability, satisfies the emergency braking requirement.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic view of an eddy current braking system according to an embodiment of the present invention;
fig. 2 is a schematic view of an eddy current braking system according to another embodiment of the present invention.
Detailed Description
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 2, in an embodiment of the present application, there is provided an eddy current braking system, including: an eddy current braking device; the eddy current braking device comprises a first power supply loop in controllable electric connection with the eddy current braking device, a second power supply loop in controllable electric connection with the eddy current braking device, and a power supply control module in electric connection with the first power supply loop and the second power supply loop.
Wherein, first power supply loop includes: the system comprises a traction system main loop and an excitation power supply electrically connected with the traction system main loop. The excitation power supply gets electricity from the traction intermediate circuit, and outputs the electricity to the eddy current braking device after being rectified and adjusted in size by the excitation power supply, so that the first power supply circuit can also be called as an excitation power supply circuit. The excitation power supply comprises an isolation module, a rectifier, a chopping voltage reduction module, an excitation power supply control unit and the like, and the excitation power supply can adjust the excitation current of a corresponding grade according to the braking grade. Under the condition that an excitation power supply is independently adopted to supply power to the eddy current braking device, the complete power supply loop has large span and complex structure, all functional modules are connected in series, and the reliability of the complete power supply loop cannot meet the requirement of emergency braking.
Specifically, the main loop of the traction system comprises a transformer connected with a contact network and grounded, four quadrants electrically connected with the transformer, a (traction) intermediate loop electrically connected with the four quadrants, and a traction motor assembly electrically connected with the intermediate loop. Wherein the traction motor assembly includes an inverter connected to the intermediate circuit and a traction motor electrically connected to the inverter. The excitation power supply is electrically connected with the intermediate circuit; the first switch controls the on-off between the excitation power supply and the intermediate loop. Under the normal driving condition, the main loop of the traction system supplies power to the traction motor assembly, so that the traction motor rotates to realize the movement of the train. Wherein the electrical connection location of the power supply assembly to the eddy current braking device is between the second switch and the eddy current braking device.
Based on this, the eddy current braking system provides a second supply circuit. The second power supply loop includes: a power supply assembly electrically connected to the eddy current braking device; the power supply assembly is electrically connected to the eddy current braking device. The power supply control module selects a power supply loop for supplying power to the eddy current brake device according to loop states of the first power supply loop and the second power supply loop during emergency braking.
The eddy current braking system in the embodiment is provided with a first power supply loop and a second power supply loop which supply power to the eddy current braking device, and a power supply control module is used for selecting the power supply loop which supplies power to the eddy current braking device according to the loop states of the first power supply loop and the second power supply loop, so that when emergency braking occurs under the condition that one power supply loop fails, the other power supply loop can still be selected for supplying power to implement eddy current braking, and therefore the eddy current braking system in the embodiment can remarkably improve the reliability of the system and meet the emergency braking requirement.
The eddy current braking system provided by the embodiment can supply power to the eddy current braking device in time through the second power supply loop when the excitation power supply loop fails, and the second power supply loop is completely independent from the original excitation power supply loop and is not influenced by links such as a main loop of a traction system, an excitation power supply and the like, so that the reliability of the eddy current braking system is improved, and the eddy current braking meets the safety level requirement of emergency braking.
The power supply control module selects the second power supply loop to supply power to the eddy current braking device and cuts off the electrical connection between the excitation power supply and the eddy current braking device when the first power supply loop is in an unavailable state. The excitation power supply can be provided with a state monitoring module, the state monitoring module is used for monitoring the output current or voltage, and the state monitoring module sends a loop abnormal signal to the power supply control module when the output current or voltage does not reach a target value. Based on the circuit abnormal signal, the power supply control module determines that the first power supply circuit is in an unavailable state, and then selects the second power supply circuit to supply power to the eddy current braking device when emergency braking is performed (for example, an emergency braking switch is triggered by an operator), so that the eddy current braking device is normally started to perform train braking.
In the first power supply loop, a first switch for controlling on-off is arranged between the excitation power supply and the main loop of the traction system; and a second switch for controlling on-off is arranged between the eddy current braking device and the excitation power supply. The power supply control module is electrically connected with the first switch and the second switch to control the on-off of the first switch and the second switch, so that the on-off control of the excitation power supply, the intermediate circuit and the eddy current braking device is realized, and the electric connection controllability of the first power supply circuit and the eddy current braking device is further realized. Specifically, the first switch is an excitation power supply input contactor KM1 electrically connected with the power supply control module; the second switch is an excitation power supply output contactor KM2 electrically connected with the power supply control module.
In the following embodiments of the present application, specific implementation means of the second power supply loop include, but are not limited to, the following two: (1) the power is supplied by a storage battery, and (2) the power is supplied by a permanent magnet motor. When emergency braking occurs, the permanent magnet motor is used as a generator, magnetic lines of force generated by the permanent magnet cut a stator winding, induced current is generated on the winding, the induced current is led out between the traction motor and the inverter to the rectifier, and the induced current is filtered by the filter and then output to the eddy current braking device. The electric energy generated by the permanent magnet motor can supply power for the eddy current braking device of the adjacent vehicle or the adjacent bogie. The power supply loop is simple in structure, can meet functional requirements by using analog circuit components, and is higher in reliability than intelligent components. The permanent magnet motor power supply loop is connected with the excitation power supply loop in parallel, a power supply control module selects a connection path according to the available states of the two power supply loops during emergency braking, and the excitation power supply is preferentially selected to supply power when the working states of the two loops are normal.
In one embodiment as shown in fig. 1, the power supply assembly comprises an accumulator electrically connected to the eddy current braking device, and a charging device electrically connected to the accumulator. The electric connection position of the charging device and the intermediate circuit is located between the first switch and the intermediate circuit. The charging device may be a charger. And a third switch for controlling on-off is arranged between the charging device and the intermediate loop. And a fourth switch for controlling the on-off is arranged between the storage battery and the eddy current braking device. In this embodiment, the third switch is a charging switch KM 3. The fourth switch is a storage battery output contactor KM4 electrically connected with the power control module.
And the power supply control module closes the third switch when the storage capacity of the storage battery is lower than a preset value and the fourth switch is in an open state, and controls the charging device to charge the storage battery. Thus, when the eddy current brake is not applied, for example, the electric energy of the storage battery is insufficient (for example, the electric energy is below 50%), the storage battery is charged by the charger. The general state of the charging switch KM3 and the running state of the charger are determined according to the characteristics of the storage battery. The charging source can be executed according to specific conditions, is not limited to taking power from a traction intermediate circuit, and can also take power from other positions, such as an auxiliary converter.
In this embodiment, the power control module includes: and a first linkage control part which can close only one of the excitation power supply output contactor KM2 and the storage battery output contactor KM4 when braking is performed in response to the opening of the eddy current brake device.
In a working state, when the excitation power supply loop is normal, the excitation power input contactor KM1 is in a closed state, and the excitation power output contactor KM2 and the storage battery output contactor KM4 are in an open state. The excitation power supply output contactor KM2 and the storage battery output contactor KM4 are provided with linkage control signals through a first linkage control part, and only one of the two contactors can be closed when responding to eddy current braking. The storage battery is provided with a battery electric quantity and health state monitoring system.
When the eddy current brake responds to the service brake, if the power supply loop of the excitation power supply is normal, the excitation power supply output contactor KM2 is closed, the excitation power supply supplies power to the eddy current brake device, and meanwhile, the storage battery output contactor KM4 needs to be ensured to be disconnected. If the excitation power supply circuit has a fault, the brake system cuts off eddy current brake, and other brake modes supplement the common brake force.
When the eddy current brake responds to the emergency brake, if the excitation power supply loop is normal, the KM2 is closed, the excitation power supply loop supplies power, and meanwhile, the storage battery output contactor KM4 needs to be ensured to be disconnected. If the excitation power supply fails, the storage battery output contactor KM4 is closed, power is supplied by the storage battery power supply loop, and meanwhile, the excitation power supply output contactor KM2 needs to be ensured to be disconnected.
As shown in fig. 1, in the power supply mode of this embodiment, a storage battery is added as a redundant power supply for eddy current braking, and the capacity of the storage battery should at least meet the requirement of emergency braking for 1-2 times. The output end of the traction intermediate loop is connected with two power supply loops, one of the two power supply loops is connected with an excitation power supply, and the mode of the excitation power supply is the same as or similar to that of the original power supply; the other path is connected with a charging device, when the storage battery is in a power-down state and in a non-working state, the storage battery is charged by a charger, and the storage battery is used as a constant voltage source to directly supply power for the eddy current braking device.
Although the battery supplies power to the eddy current braking device in a voltage source mode (constant voltage mode), the resistance increases due to the temperature rise of the electromagnet of the eddy current braking device, the exciting current gradually decreases, and thus the braking force decreases. However, the braking time is short, the reduction range of the exciting current is limited (about 20%), the average braking force in the whole braking process is still considerable, particularly, the train speed is maximum in the initial braking stage, the eddy current braking force is also maximum at the moment, and the stage is particularly obvious for shortening the braking distance. The storage battery power supply loop is connected with the excitation power supply loop in parallel, a power supply control module selects a connection path according to the available states of the two power supply loops during emergency braking, and the excitation power supply is preferentially selected to supply power when the working states of the two loops are normal.
In the method adopted by the embodiment, the storage battery power supply loop and the excitation power supply loop are connected in parallel, the two power supply loops are mutually independent, when the loop where the excitation power supply is located fails, the electric energy stored in the storage battery can still meet the requirement of eddy current emergency braking, and the overall reliability of the power supply system is improved.
In addition, the storage battery power supply loop does not need to use a high-power module and an intelligent component, and has high reliability and safety. The storage battery power supply loop is used as a redundancy design of the excitation power supply loop, so that the eddy current brake can still be used as an emergency brake when the excitation power supply loop fails.
In another embodiment, as shown in fig. 2, the power supply assembly includes the rectifying and filtering device electrically connected to the traction motor. In this embodiment, the traction motor is a permanent magnet motor. The rectifying and filtering device comprises a rectifier and a filter which are connected. The rectifying and filtering device is electrically connected with the eddy current braking device. And a fifth switch for controlling on-off is arranged between the traction motor and the inverter. And a sixth switch for controlling on-off is arranged between the rectifying and filtering device and the traction motor. And a seventh switch for controlling the on-off is arranged between the rectifying and filtering device and the eddy current braking device.
Specifically, the first switch is an excitation power supply input contactor KM1 electrically connected with the power supply control module. The second switch is an excitation power supply output contactor KM2 electrically connected with the power supply control module. The fifth switch is an inverter output contactor KM5 electrically connected with the power control module. The sixth switch is a rectifying and filtering input contactor KM6 electrically connected with the power control module. The seventh switch is a rectifying and filtering output contactor KM7 electrically connected with the power control module.
Wherein the power control module comprises: a second linkage control section capable of closing only one of the excitation power supply output contactor KM2 and the rectification and filtration output contactor KM7 when braking is performed in response to turning on the eddy current brake apparatus, and a third linkage control section capable of opening the inverter output contactor KM5 and closing the rectification and filtration input contactor KM6 when the traction motor supplies power to the eddy current brake apparatus.
The eddy current braking system of this embodiment adds a second power supply loop, which may further be referred to as a permanent magnet motor power supply loop, that is drawn by the permanent magnet motor, and that is connected in parallel with the excitation power supply loop. When braking, the permanent magnet motor works in a generator mode, magnetic lines of force generated by the permanent magnet cut a stator winding, current is induced on the winding, induced current is led out between the traction motor and the inverter to the rectifier, and the induced current is filtered by the filter and then output to the eddy current braking device.
In a working state, when the excitation power supply loop is normal, the excitation power input contactor KM1 is in a closed state, and the excitation power output contactor KM2 and the rectification filtering output contactor KM7 are in an open state. The excitation power supply output contactor KM2 and the rectification filter output contactor KM7 are provided with linkage control signals by using the second linkage control part, and only one of the two contactors can be closed when responding to eddy current braking. The inverter output controller KM5 and the rectifying and filtering input controller KM6 are provided with linkage control signals, and when the permanent magnet motor supplies power to the eddy current braking device, the rectifying and filtering input controller KM6 needs to be closed and the inverter output controller KM5 needs to be disconnected.
When the eddy current brake responds to the service brake, if the power supply loop of the excitation power supply is normal, the excitation power supply output contactor KM2 is closed, the excitation power supply supplies power to the eddy current brake device, and meanwhile, the rectification filtering output contactor KM7 needs to be ensured to be disconnected. If the power supply circuit has faults, the brake system cuts off eddy current brake, and other brake modes supplement the common brake force.
When the eddy current brake responds to the emergency brake, if the excitation power supply loop is normal, the excitation power supply output contactor KM2 is closed, the excitation power supply loop supplies power, and meanwhile, the rectification filtering output contactor KM7 needs to be ensured to be disconnected. If the excitation power supply fails, the rectifying and filtering input controller KM6 and the rectifying and filtering output contactor KM7 are closed, the permanent magnet motor supplies power, and meanwhile, the inverter output controller KM5 and the excitation power supply output contactor KM2 are ensured to be disconnected.
In the method adopted by the embodiment, the permanent magnet motor can generate induction current without external excitation during emergency braking, and the induction current can be used for an eddy current braking device after rectification and filtering processing. The power supply loop of the permanent magnet motor is connected with the power supply loop of the excitation power supply in parallel, the two power supply paths are mutually independent, and the overall reliability of the power supply system is improved.
When the permanent magnet motor is powered, external energy sources are not consumed, and storage battery type chemical energy storage components are not additionally arranged, so that the energy-saving, environment-friendly and weight-reducing trend of the train is met. The power supply loop does not need to use intelligent components and parts, and has high reliability and safety.
The electrical energy generated by the permanent magnet motor is sufficient for use adjacent to the eddy current braking device and has a sufficient margin, which means that the permanent magnet motor can achieve the power supply requirement even at a low wheel rolling adhesion coefficient, and the availability of power supplied by the permanent magnet motor is high.
In summary, when the excitation power supply circuit is unavailable due to special situations (such as a catenary fault, blocked traction, an excitation power failure, and the like) in emergency braking, the schemes provided by the embodiment of fig. 1 and the embodiment of fig. 2 can both ensure that the eddy current braking device can respond to the emergency braking request in time.
Any numerical value recited herein includes all values from the lower value to the upper value, in increments of one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.
Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.
All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.
A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of the subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed inventive subject matter.
Claims (10)
1. An eddy current braking system, comprising:
an eddy current braking device;
a first power supply circuit in controllable electrical connection with the eddy current braking device, comprising: the traction system comprises a traction system main loop and an excitation power supply electrically connected with the traction system main loop;
a second power supply circuit in controllable electrical connection with the eddy current braking device, comprising: a power supply assembly electrically connected to the eddy current braking device;
and the power supply control module is electrically connected with the first power supply loop and the second power supply loop.
2. An eddy current braking system as claimed in claim 1, wherein the power control module selects the second power supply circuit to supply power to the eddy current braking device and cuts off the electrical connection between the excitation power supply and the eddy current braking device if the first power supply circuit is in an unavailable state.
3. An eddy current brake system as claimed in claim 2, wherein a first switch for controlling on/off is provided between the excitation power supply and the traction system main circuit in the first power supply circuit; and a second switch for controlling on-off is arranged between the eddy current braking device and the excitation power supply.
4. An eddy current braking system as claimed in claim 3 wherein the traction system main loop includes a transformer connected to the overhead line and grounded, four quadrants electrically connected to the transformer, an intermediate loop electrically connected to the four quadrants, a traction motor assembly electrically connected to the intermediate loop; the excitation power supply is electrically connected with the intermediate circuit; the first switch controls the on-off between the excitation power supply and the intermediate loop.
5. An eddy current braking system as claimed in claim 4 wherein the power supply assembly comprises a battery electrically connected to the eddy current braking system and a charging device electrically connected to the battery; the charging device is connected with the intermediate loop; a third switch for controlling on-off is arranged between the charging device and the intermediate loop; a fourth switch for controlling the on-off is arranged between the storage battery and the eddy current braking device;
and the power supply control module closes the third switch when the storage capacity of the storage battery is lower than a preset value and the fourth switch is in an open state, and controls the charging device to charge the storage battery.
6. An eddy current braking system as claimed in claim 5 wherein the electrical connection location of the power supply assembly to the eddy current braking system is between the second switch and the eddy current braking system; the electric connection position of the charging device and the intermediate circuit is located between the first switch and the intermediate circuit.
7. An eddy current braking system as claimed in claim 5 wherein the first switch is an excitation power input contactor electrically connected to the power control module; the second switch is an excitation power supply output contactor electrically connected with the power supply control module; the fourth switch is a storage battery output contactor electrically connected with the power supply control module; wherein the power control module comprises: a first interlock control unit capable of closing only one of the excitation power supply output contactor and the battery output contactor when braking is performed in response to turning on the eddy current brake device.
8. An eddy current braking system as claimed in claim 4 wherein the traction motor assembly includes an inverter connected to the intermediate circuit and a traction motor electrically connected to the inverter;
the power supply assembly comprises the rectifying and filtering device electrically connected with the traction motor; the rectifying and filtering device is electrically connected with the eddy current braking device; a fifth switch for controlling on-off is arranged between the traction motor and the inverter; a sixth switch for controlling on-off is arranged between the rectifying and filtering device and the traction motor; and a seventh switch for controlling the on-off is arranged between the rectifying and filtering device and the eddy current braking device.
9. An eddy current braking system as claimed in claim 8 wherein the first switch is an excitation power input contactor electrically connected to the power control module; the second switch is an excitation power supply output contactor electrically connected with the power supply control module; the fifth switch is an inverter output contactor electrically connected with the power supply control module; the sixth switch is a rectification filtering input contactor electrically connected with the power supply control module; the seventh switch is a rectification filtering output contactor electrically connected with the power supply control module;
wherein the power control module comprises: a second linkage control section capable of closing only one of the excitation power supply output contactor and the rectification filter output contactor when braking is performed in response to turning on the eddy current braking device, and a third linkage control section disconnecting the inverter output contactor and closing the rectification filter input contactor when the traction motor supplies power to the eddy current braking device.
10. An eddy current braking system as claimed in claim 8 wherein the traction motor is a permanent magnet motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121572689.7U CN215097038U (en) | 2021-07-12 | 2021-07-12 | Eddy current braking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121572689.7U CN215097038U (en) | 2021-07-12 | 2021-07-12 | Eddy current braking system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215097038U true CN215097038U (en) | 2021-12-10 |
Family
ID=79320078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121572689.7U Active CN215097038U (en) | 2021-07-12 | 2021-07-12 | Eddy current braking system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215097038U (en) |
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2021
- 2021-07-12 CN CN202121572689.7U patent/CN215097038U/en active Active
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