Permanent magnet traction electric transmission system and railway vehicle

Abstract

The invention provides a permanent magnet traction electric transmission system and a railway vehicle, and the permanent magnet traction electric transmission system is characterized in that an auxiliary transformer and a traction transformer are integrated in a sealing box body, and an oil-immersed forced circulation cooling system is arranged in the sealing box body; the oil-immersed forced circulation cooling system is configured to be capable of cooling the auxiliary transformer and / or the traction transformer. According to the embodiment of the invention, on the premise that the heat dissipation requirements of the auxiliary transformer and the traction transformer are ensured, a cooling fan of the auxiliary transformer is omitted, the noise pollution of the cooling fan to the environment is solved, and the arrangement space of a permanent magnet traction transmission part is optimized.

Description

Technical Field

[0001] The present disclosure relates to the technical field of motors, and more particularly, to a permanent magnet traction electric drive system and a rail vehicle. Background Art

[0002] At present, permanent magnet traction systems have broad application prospects in the field of rail transit, and have advantages such as energy conservation, noise reduction, and less maintenance.

[0003] In the related art, the auxiliary power supply of the permanent magnet traction system mainly includes an auxiliary inverter, an auxiliary transformer, and a filtering device. Among them, the auxiliary transformer generally uses a dry-type transformer, and a cooling fan needs to be configured for heat dissipation during operation. However, the relatively large noise of the cooling fan brings great difficulties and limitations to the noise reduction design of the locomotive.

[0004] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0005] The purpose of the present disclosure is to provide a permanent magnet traction electric drive system and a rail vehicle, which are used to overcome at least to some extent the problems such as the large noise of the cooling fan of the permanent magnet traction motor caused by the limitations and defects of the related art.

[0006] According to the first aspect of the embodiments of the present disclosure, a permanent magnet traction electric drive system is provided, including integrating an auxiliary transformer and a traction transformer in a sealed box body, and an oil-immersed forced circulation cooling system is arranged in the sealed box body, and the oil-immersed forced circulation cooling system is configured to be able to cool the auxiliary transformer and the traction transformer.

[0007] In an exemplary embodiment of the present disclosure, the permanent magnet traction electric drive system further includes a four-quadrant rectifier, a traction inverter, an auxiliary inverter, and a three-phase filter capacitor, and the four-quadrant rectifier, the traction inverter, the auxiliary inverter, and the three-phase filter capacitor are integrated in a converter system cabinet.

[0008] In an exemplary embodiment of the present disclosure, the permanent magnet traction electric drive system further includes a main contactor, a pre-charge contactor, and a three-pole isolation contactor, and the main contactor, the pre-charge contactor, and the three-pole isolation contactor are integrated in a contactor box.

[0009] In an exemplary embodiment of the present disclosure, the main contactor, the pre-charge contactor, and the three-pole isolation contactor are partitioned and arranged in the contactor box.

[0010] In an exemplary embodiment of the present disclosure, the permanent magnet traction electric drive system further includes a permanent magnet traction motor, and the permanent magnet traction motor includes:

[0011] A motor stator core provided with monitoring winding holes and / or monitoring winding slots, and a monitoring winding is disposed in the monitoring winding holes and / or the monitoring winding slots. The monitoring winding is configured to be able to detect the magnetic field distortion of the permanent magnet traction motor and output the magnetic field distortion as a distorted voltage.

[0012] In an exemplary embodiment of the present disclosure, the permanent magnet traction motor further includes: a vibration sensor near the bearing part of the base of the permanent magnet traction motor; a motor power supply line for supplying power to drive the permanent magnet traction motor, and at least two of the three power supply lines of the motor power supply line are provided with current sensors; a voltage sensor, the monitoring winding is a three-phase symmetrical winding, and the voltage sensor is connected to the line of the winding to detect the output voltage of the monitoring winding.

[0013] In an exemplary embodiment of the present disclosure, the three-pole isolation contactor is connected between the traction inverter of the permanent magnet traction motor and the body of the permanent magnet traction motor.

[0014] In an exemplary embodiment of the present disclosure, when the permanent magnet traction motor operates normally, the voltage waveform output by the monitoring winding is a sine wave.

[0015] In an exemplary embodiment of the present disclosure, when there is an inter-turn short circuit in the permanent magnet traction motor, the current sensor outputs a negative sequence current; and / or, when there is a phase-to-phase short circuit in the permanent magnet traction motor, the voltage sensor detects the distorted voltage output by the monitoring winding and detects multiple k1-order harmonics, and the vibration sensor detects that the vibration acceleration exceeds a preset acceleration; and / or, when the permanent magnet of the permanent magnet traction motor demagnetizes, the voltage sensor detects that the effective value of the voltage output by the monitoring winding decreases; and / or, when the permanent magnet of the permanent magnet traction motor is broken, the voltage sensor detects the distorted voltage output by the monitoring winding and detects multiple n1-order harmonics.

[0016] According to a second aspect of the embodiments of the present disclosure, there is provided a rail vehicle, including:

[0017] The permanent magnet traction electric drive system according to any one of the above technical solutions.

[0018] In the embodiments of the present disclosure, by integrating the auxiliary transformer and the traction transformer into a sealed box body, an oil-immersed forced circulation cooling system is arranged in the sealed box body, and the oil-immersed forced circulation cooling system is configured to be able to cool the auxiliary transformer and the traction transformer, canceling the cooling fan for the auxiliary transformer, solving the noise pollution of the cooling fan to the environment, and optimizing the layout space of the permanent magnet traction drive components.

[0019] Furthermore, by integrating the four-quadrant rectifier, the traction inverter, the auxiliary inverter, and the three-phase filter capacitor into a converter system cabinet, and integrating the main contactor, the pre-charge contactor, and the three-pole isolation contactor into a contactor box, that is, separating the converter module and the large contactor, the permanent magnet traction system only affects the layout of the integrated components in the contactor box and does not affect the integrated setting of the converter system cabinet, facilitating the unified inspection and maintenance of the contactor components.

[0020] Even further, by partitioning and arranging the main contactor, the pre-charge contactor, and the three-pole isolation contactor in the contactor box, the adverse effects and potential hazards on other contactors caused by any electrical accident of a contactor are reduced.

[0021] Even further, by arranging monitoring winding holes and / or monitoring winding slots in the stator core of the permanent magnet traction motor to detect the magnetic field distortion of the permanent magnet traction motor, and outputting the magnetic field distortion as a distorted voltage, cooperating with vibration sensors and current sensors to identify faults such as cracked permanent magnet steel and inter-turn short circuit of the permanent magnet motor. Compared with the scheme that only relies on current sensors for fault detection, the fault detection scheme of the present application has higher accuracy and reliability.

[0022] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure, and those of ordinary skill in the art can obtain other drawings without creative efforts based on these drawings.

[0024] Figure 1 is a schematic structural diagram of a permanent magnet traction electric drive system in an exemplary embodiment of the present disclosure;

[0025] Figure 2 is a schematic structural diagram of a permanent magnet traction electric drive system in another exemplary embodiment of the present disclosure;

[0026] Figure 3 is a schematic structural diagram of a permanent magnet traction electric drive system in another exemplary embodiment of the present disclosure;

[0027] Figure 4 is a schematic structural diagram of a permanent magnet traction electric drive system in another exemplary embodiment of the present disclosure;

[0028] Figure 5 is a schematic structural diagram of a permanent magnet traction electric drive system in another exemplary embodiment of the present disclosure;

[0029] Figure 6 is a schematic structural diagram of a permanent magnet traction electric drive system in another exemplary embodiment of the present disclosure;

[0030] Figure 7 is a schematic block diagram of a rail vehicle in an exemplary embodiment of the present disclosure,

[0031] such as Figures 1 to 7 The corresponding relationship between the structures and the markings in is as follows:

[0032] Sealed box 100, traction transformer 101, auxiliary transformer 102, three-phase filter capacitor 103, main contactor 104, pre-charge contactor 105, three-pole isolation contactor 106, auxiliary inverter 107, four-quadrant rectifier 108, traction inverter 109, permanent magnet traction motor 110, converter system cabinet 200, contactor box 300, motor stator core 311, stator winding slot 312, monitoring winding hole 313, vibration sensor 314, current sensor 315, voltage sensor 316, rail vehicle 700, permanent magnet traction electric drive assembly 702. Detailed implementation manners

[0033] Now, the exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The features, structures, or characteristics described can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present disclosure. The typical embodiments embodying the features and advantages of the present disclosure will be described in detail in the following description. It should be understood that the present disclosure can have various changes in different embodiments, all of which do not depart from the scope of the present disclosure, and the descriptions and drawings therein are for illustrative purposes only and are not intended to limit the present disclosure.

[0034] In the following description of different exemplary embodiments of the present disclosure, reference is made to the accompanying drawings, which form a part of the present disclosure, and in which different exemplary structures for implementing various aspects of the present disclosure are shown by way of example. It should be understood that components, structures, and other specific solutions may be used, and structural and functional modifications may be made without departing from the scope of the present disclosure. Moreover, although terms such as "above", "between", "within", etc. may be used in this specification to describe different exemplary features and elements of the present disclosure, these terms are used herein only for convenience, for example, according to the orientation of the examples in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present disclosure.

[0035] As Figures 1 to 7 shown, based on electromagnetic induction and the magnetic field of permanent magnets, when the three-phase alternating current provided by the traction inverter 109 is applied to the motor stator winding, a rotating magnetic field will be generated. This rotating magnetic field interacts with the magnetic field generated by the permanent magnets to generate an electromagnetic torque, driving the motor rotor to rotate. The following are the working principles and the collaborative working process of each component:

[0036] Principle and function of the traction transformer 101: It transforms the high-voltage alternating current input from the catenary into a lower-voltage alternating current suitable for the subsequent components to work. By using the principle of electromagnetic induction, the voltage transformation is achieved through the turns ratio of the primary and secondary windings, providing a suitable voltage level for the entire electric drive system, and at the same time playing an electrical isolation role to ensure the safety and stability of the system.

[0037] Principle and function of the auxiliary transformer 102: Similar to the traction transformer 101, it is also based on the principle of electromagnetic induction to transform the input alternating current into alternating currents of different voltage levels required by the auxiliary system, providing a suitable power supply for auxiliary devices such as the auxiliary inverter 107 to meet the power consumption requirements of auxiliary systems on the train, such as air conditioners, lighting, ventilation, etc.

[0038] Principle and function of the three-phase filter capacitor 103: It filters the three-phase alternating current by using the capacitive reactance characteristic of the capacitor to the alternating current. In an AC circuit, the capacitor can store and release charges, playing a role in smoothing the voltage and filtering out high-frequency harmonics, making the voltage input to the subsequent components more stable, reducing voltage fluctuations and high-frequency noise, and improving the reliability and stability of the system.

[0039] Principle and function of the main contactor 104: Control the closing and opening of the contacts through the action of electromagnetic force to achieve the on-off control of the circuit. When the coil of the main contactor 104 is energized, an electromagnetic force is generated to attract the armature, causing the contacts to close and the circuit to conduct; when the coil is de-energized, the electromagnetic force disappears, and the contacts are disconnected under the action of the spring force, cutting off the circuit, controlling the connection and disconnection between the traction transformer 101 and the subsequent circuit, and facilitating overall startup, stop, and fault protection operations of the system.

[0040] Principle and function of the pre-charge contactor 105: Control the pre-charge process of components such as the DC-link capacitor at the initial stage of system startup. When the pre-charge contactor 105 is closed, the current slowly charges the capacitor through components such as the pre-charge resistor, preventing the capacitor from generating an excessive impact current during the charging instant, protecting the electronic components in the system, avoiding damage due to excessive charging current, and ensuring the safe startup of the system.

[0041] Principle and function of the three-pole isolation contactor 106: Also based on electromagnetic force to control the on-off of the contacts, with three independent contacts, capable of simultaneously isolating or connecting the three-phase circuit. When it is necessary to repair the system or isolate the faulty part, by disconnecting the three-pole isolation contactor 106, the corresponding circuit part is isolated from other parts, ensuring the safety of maintenance personnel and the normal operation of other parts of the system.

[0042] Principle and function of the auxiliary inverter 107: Convert the alternating current output by the auxiliary transformer 102 into alternating current with different voltages and frequencies. Usually, power electronic devices such as IGBTs (Insulated Gate Bipolar Transistors) are used. By controlling the on and off time of the IGBTs, the regulation of the output voltage and frequency is achieved, providing suitable power supplies for various auxiliary equipment on the train, meeting the requirements of different auxiliary equipment for power supply voltage and frequency, and ensuring the normal operation of the auxiliary equipment.

[0043] Principle and function of the four-quadrant rectifier 108: Use power electronic devices to convert the alternating current output by the traction transformer 101 into direct current, and can achieve phase control of the input current and voltage under different working conditions, enabling the input current to be adjusted according to needs in all four quadrants, realizing bidirectional energy flow, converting alternating current energy into direct current energy, providing a stable direct current power supply for the subsequent traction inverter 109 and other DC loads, while improving the power factor of the system and reducing harmonic pollution to the power grid.

[0044] Principle and function of the traction inverter 109: It converts the direct current output by the four - quadrant rectifier 108 into alternating current with variable frequency and voltage. By controlling the conduction and cutoff sequence and time of power electronic devices such as IGBTs, three - phase alternating current with different frequencies and amplitudes is generated to meet the speed regulation and driving requirements of the permanent - magnet traction motor 110. According to the speed and load demand of the train operation, it precisely controls the power supply frequency and voltage of the permanent - magnet traction motor 110 to achieve smooth speed regulation and efficient operation of the motor, and it is a key component for driving the permanent - magnet traction motor 110.

[0045] The following will describe the exemplary embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0046] Figure 1 It is a schematic structural diagram of a permanent - magnet traction electric drive system in an exemplary embodiment of the present disclosure.

[0047] Reference Figure 1 , the permanent - magnet traction electric drive system may include:

[0048] Integrate the auxiliary transformer 102 and the traction transformer 101 into a sealed box 100. An oil - immersed forced - circulation cooling system is arranged in the sealed box 100, and the oil - immersed forced - circulation cooling system is configured to be able to cool the auxiliary transformer 102 and the traction transformer 101.

[0049] In an embodiment of the present disclosure, by integrating the auxiliary transformer 102 and the traction transformer 101 into a sealed box 100, an oil - immersed forced - circulation cooling system is arranged in the sealed box 100, and the oil - immersed forced - circulation cooling system is configured to be able to cool the auxiliary transformer 102 and the traction transformer 101, the cooling fan for the auxiliary transformer 102 is cancelled, solving the noise pollution of the cooling fan to the environment and optimizing the layout space of the permanent - magnet traction drive components.

[0050] Furthermore, by integrating the four - quadrant rectifier 108, the traction inverter 109, the auxiliary inverter 107, and the three - phase filter capacitor 103 into a converter system cabinet 200, and integrating the main contactor 104, the pre - charge contactor 105, and the three - pole isolation contactor 106 into a contactor box 300, that is, separating the converter module and the large - scale contactor, the integrated components in the contactor box 300 and the integrated equipment in the converter system cabinet 200 are independent of each other, facilitating unified inspection and maintenance of similar components.

[0051] Even further, by arranging the main contactor 104, the pre - charge contactor 105, and the three - pole isolation contactor 106 in a partitioned layout in the contactor box 300, the adverse effects and potential hazards on other contactors caused by an electrical accident of any one contactor are reduced.

[0052] In the related art, the main difference between the permanent magnet traction system and the traditional asynchronous motor traction system is the permanent magnet traction motor. The rotor of the permanent magnet traction motor is embedded with permanent magnets. During the operation of the motor, a back electromotive force is generated at the winding end. When the locomotive is coasting or being towed without power, it is in the generator state. When the power supply of the converter is cut off, there is still an electromotive force in the permanent magnet motor winding.

[0053] With the in-depth research on the permanent magnet traction system, during the testing and experimental application of permanent magnet multiple units and permanent magnet direct drive locomotives, a series of operation risks of the permanent magnet traction system have been exposed. Faults such as permanent magnet demagnetization, permanent magnet fragmentation, and phase-to-phase short circuit may occur during the operation of the permanent magnet motor. Currently, two current sensors on the power supply line of the permanent magnet motor are mainly used for fault detection. This detection method is affected by the power supply at the power supply end of the traction inverter, and the detection difficulty and accuracy for internal faults of the motor are not sufficient to meet the requirements for the reliable operation of the permanent magnet traction system.

[0054] Based on the possible faults such as permanent magnet demagnetization, permanent magnet fragmentation, and phase-to-phase short circuit during the operation of the permanent magnet motor, the embodiments of the present disclosure detect the magnetic field distortion of the permanent magnet traction motor 110 by providing a monitoring winding hole 313 and / or a monitoring winding slot in the motor stator core 311 of the permanent magnet traction motor 110, and output the magnetic field distortion as a distorted voltage, which is combined with a vibration sensor 314 and a current sensor 315 to identify faults such as permanent magnet cracking and inter-turn short circuit of the permanent magnet motor. Compared with the scheme that only relies on the current sensor 315 for fault detection, the accuracy and reliability of detecting faults such as permanent magnet demagnetization, permanent magnet fragmentation, and phase-to-phase short circuit are improved.

[0055] Next, each structure of the permanent magnet traction electric drive system will be described in detail.

[0056] In the related art, the auxiliary power supply of the permanent magnet traction system mainly includes an auxiliary inverter 107, an auxiliary transformer 101, and a filtering device. The auxiliary inverter 107 outputs a three-phase power supply with high harmonic content, which is stepped down and filtered by a step-down auxiliary transformer 101 and a filtering capacitor 103 to output a three-phase 380V power supply that meets the harmonic content. During the operation of the auxiliary transformer 101, a cooling fan needs to be configured for heat dissipation, and the relatively large noise of the cooling fan brings difficulties to the noise reduction design of the locomotive.

[0057] In view of the technical problems caused by the above cooling fan, the exemplary embodiments of the present disclosure propose a new permanent magnet traction electric drive system, as Figure 2As shown, the permanent magnet traction electric drive system further includes a four-quadrant rectifier 108, a traction inverter 109, an auxiliary inverter 107, and a three-phase filter capacitor 103. The four-quadrant rectifier 108, the traction inverter 109, the auxiliary inverter 107, and the three-phase filter capacitor 103 are integrated into a converter system cabinet 200.

[0058] In this embodiment, by integrating the four-quadrant rectifier 108, the traction inverter 109, the auxiliary inverter 107, and the three-phase filter capacitor 103 into a converter system cabinet 200, it helps to improve the cleanliness of the working environment of the four-quadrant rectifier 108, the traction inverter 109, the auxiliary inverter 107, and the three-phase filter capacitor 103, and effectively improves the service life of the electronic devices in the converter system cabinet 200.

[0059] In an exemplary embodiment of the present disclosure, as Figure 3 shown, the permanent magnet traction electric drive system further includes a main contactor 104, a pre-charge contactor 105, and a three-pole isolation contactor 106. The main contactor 104, the pre-charge contactor 105, and the three-pole isolation contactor 106 are integrated into a contactor box 300.

[0060] In this embodiment, by integrating the main contactor 104, the pre-charge contactor 105, and the three-pole isolation contactor 106 into a contactor box 300, the sealing protection level and electrical safety of the contactors can be improved.

[0061] In an exemplary embodiment of the present disclosure, the main contactor 104, the pre-charge contactor 105, and the three-pole isolation contactor 106 are partitioned and arranged in the contactor box 300.

[0062] In this embodiment, by partitioning and arranging the main contactor 104, the pre-charge contactor 105, and the three-pole isolation contactor 106 in the contactor box 300, the electrical safety between the main contactor 104, the pre-charge contactor 105, and the three-pole isolation contactor 106 can be improved. Especially when an electrical accident or fire occurs in any contactor, the probability that other contactors are affected or catch fire can be reduced.

[0063] In an exemplary embodiment of the present disclosure, the permanent magnet traction electric drive system further includes a permanent magnet traction motor 110, and the permanent magnet traction motor 110 includes:

[0064] The motor stator core 311 is provided with a monitoring winding wire hole 313 and / or a monitoring winding wire groove. The monitoring winding is arranged in the monitoring winding wire hole 313 and / or the monitoring winding wire groove. The monitoring winding is configured to be able to detect the magnetic field distortion of the permanent magnet traction motor 110 and output the magnetic field distortion as a distorted voltage.

[0065] In this embodiment, by providing a monitoring winding wire hole 313 and / or a monitoring winding wire groove, the monitoring winding is arranged in the monitoring winding wire hole 313 and / or the monitoring winding wire groove. The monitoring winding is configured to be able to detect the magnetic field distortion of the permanent magnet traction motor 110 and output the magnetic field distortion as a distorted voltage.

[0066] In an exemplary embodiment of the present disclosure, the permanent magnet traction motor 110 further includes: a vibration sensor 314, near the bearing part of the base of the permanent magnet traction motor 110; a motor power supply line for powering and driving the permanent magnet traction motor 110, and at least two of the three power supply lines of the motor power supply line are provided with current sensors 315; a voltage sensor 316. The monitoring winding is a three-phase symmetrical winding, and the voltage sensor 316 is connected to the line of the winding to detect the output voltage of the monitoring winding.

[0067] In an exemplary embodiment of the present disclosure, the three-pole isolation contactor 106 is connected between the traction inverter 109 of the permanent magnet traction motor 110 and the body of the permanent magnet traction motor 110.

[0068] In an exemplary embodiment of the present disclosure, when the permanent magnet traction motor 110 is operating normally, the voltage waveform output by the monitoring winding is a sine wave.

[0069] In an exemplary embodiment of the present disclosure, when there is an inter-turn short circuit in the permanent magnet traction motor 110, the current sensor 315 outputs a negative sequence current; and / or, when there is a phase-to-phase short circuit in the permanent magnet traction motor 110, the voltage sensor 316 detects the distorted voltage output by the monitoring winding and detects multiple k1-order harmonics, and the vibration sensor 314 detects that the vibration acceleration exceeds a preset acceleration; and / or, when the permanent magnet of the permanent magnet traction motor 110 demagnetizes, the voltage sensor 316 detects that the effective value of the voltage output by the monitoring winding decreases; and / or, when the permanent magnet of the permanent magnet traction motor 110 is broken, the voltage sensor 316 detects the distorted voltage output by the monitoring winding and detects multiple n1-order harmonics.

[0070] A schematic diagram of the permanent magnet traction electric drive assembly is shown in the appendix Figure 4 as shown.

[0071] In an exemplary embodiment of the present disclosure, asFigure 4 As shown in the figure, the permanent magnet traction electric drive assembly mainly includes an auxiliary transformer 101, a main contactor 104, a pre-charge contactor 105, a four-quadrant rectifier 108, a traction inverter 109, a three-pole isolation contactor 106, a permanent magnet traction motor 110, an auxiliary inverter 107, an auxiliary transformer 102, and a three-phase filter capacitor 103.

[0072] In related technologies, the auxiliary transformer 102 is cooled by forced ventilation with a cooling fan and is installed in the mechanical room cabinet. The auxiliary transformer 101 is an oil-immersed transformer and is installed under the vehicle. In this application, the auxiliary transformer 102 and the auxiliary transformer 101 are integrated into a sealed box in terms of structure and adopt the same set of oil-immersed forced circulation cooling system, eliminating the cooling fan of the auxiliary transformer 102, reducing the fan noise, and saving the layout space of in-vehicle equipment.

[0073] In an exemplary embodiment of the present disclosure, the four-quadrant rectifier 108, the traction inverter 109, the auxiliary inverter 107, and the three-phase filter capacitor 103 are integrated together to form a converter system cabinet. The converter system cabinet also includes necessary components such as control units, sensors, resistors, and capacitors.

[0074] In an exemplary embodiment of the present disclosure, the main contactor 104, the pre-charge contactor 105, and the three-pole isolation contactor 106 involved in the permanent magnet traction system are integrated together to form an independent contactor box, and the box body meets a relatively high sealing and protection level to ensure a clean working environment for the contactors.

[0075] In an exemplary embodiment of the present disclosure, for example, in a two-axis traction converter system, six contactors can be integrated in the cabinet. The contactors can be arranged in zones in the box body to avoid affecting other components when a discharge or fire accident occurs in one contactor.

[0076] From the perspective of component modular design, the components of the permanent magnet traction electric drive system are re-divided and integrated. By using the integration method described in this application, the converter module and the large contactor are separated. The permanent magnet traction system only affects the components integrated in the contactor box and does not affect the integration of the converter system cabinet, while facilitating the unified overhaul and maintenance of the contactor components.

[0077] In an exemplary embodiment of the present disclosure, taking a four-pole 36-slot permanent magnet motor as an example, the schematic diagram of the stator core of the permanent magnet motor is as shown in the appendix Figure 5 as shown.

[0078] In an exemplary embodiment of the present disclosure, in addition to the original stator winding slots 312 on the motor stator core 311, monitoring winding holes 313 (or slots) are provided, and the monitoring windings are arranged in the monitoring winding holes 313 to form a three-phase symmetric winding. When the motor is running, the monitoring windings are in a power generation state and can output three-phase symmetric voltages. If the main magnetic field of the permanent magnet motor is distorted due to stator winding or rotor magnet faults, the output voltage of the monitoring windings will be distorted accordingly.

[0079] The fault monitoring sensing device of the permanent magnet traction motor 110 is as shown in the appendix Figure 6 as follows.

[0080] As Figure 6 shown, vibration sensors 314 are provided at the base of the permanent magnet traction motor 110 near the bearing, two main circuit current sensors 315 are provided on the motor power supply line, and three monitoring winding voltage sensors 316 are provided for the monitoring windings. Each sensor constitutes the motor fault monitoring sensing device.

[0081] In an exemplary embodiment of the present disclosure, on the premise that the vibration sensors 314 are provided, the characteristic data of each sensor under different operating states of the permanent magnet motor are determined through experimental tests. For example, when the permanent magnet traction motor is operating normally, the voltage waveform at the monitoring winding end is a sine wave; when there is an inter-turn short circuit in the permanent magnet traction motor, negative sequence current appears in the power supply line current; when there is a phase-to-phase short circuit in the permanent magnet traction motor, the voltage waveform at the monitoring winding end is distorted and there are a large number of k1 harmonics, and the vibration acceleration exceeds the preset acceleration k2; when the magnets of the permanent magnet motor are demagnetized, the effective value of the voltage at the monitoring winding end decreases; when the magnets of the permanent magnet motor are broken, the voltage waveform at the monitoring winding end is distorted and there are a large number of n1 harmonics.

[0082] In summary, based on the technical solution of this application, during the operation of the permanent magnet motor, the normal or faulty condition of the motor is judged by analyzing the collected data of each sensor.

[0083] In an exemplary embodiment of the present disclosure, the three-pole isolation contactor 106 is used to connect the traction inverter 109 and the permanent magnet traction motor 110, and plays an isolation role in some fault situations to avoid damage to the converter components caused by the excessive back electromotive force of the permanent magnet traction motor 110. The biggest risk that the three-pole isolation contactor 106 may have is that the three-pole contactor fails to engage and cannot be disconnected in time. In this application, the three-pole isolation contactor 106 uses the same control coil. When the control coil is energized, the three-phase main contacts can be simultaneously attracted through the action of the connecting rod, ensuring the consistency of the actions of the three-phase main contacts. The three-phase main contacts use three independent reset springs for contactor disconnection. If one-phase contact adheres or is mechanically stuck, it will not affect the disconnection of the other two-phase contacts, ensuring the ability of the three main contacts to close simultaneously and disconnect independently. At the same time, the three-phase main contacts have independent status feedback signals, which can independently feedback the malfunction of their respective actions.

[0084] Corresponding to the above embodiment, the present disclosure also provides a rail vehicle, which may include the permanent magnet traction electric drive system defined in the above embodiment.

[0085] Figure 7 It is a block diagram of a rail vehicle in an exemplary embodiment of the present disclosure.

[0086] Reference Figure 7 , the rail vehicle 700 may include:

[0087] The permanent magnet traction electric drive system 702 as described in any one of the above technical solutions.

[0088] In this application, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; the term "plurality" means two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "connection", and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0089] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of this application.

[0090] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0091] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

[0092] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only illustrative, and the true scope and concept of the present disclosure are pointed out by the claims.

Claims

1. A permanent magnet traction electric drive system, characterized in that, Comprising: Integrating an auxiliary transformer and a traction transformer into a sealed box body, an oil-immersed forced circulation cooling system is arranged in the sealed box body, and the oil-immersed forced circulation cooling system is configured to be able to cool the auxiliary transformer and the traction transformer.

2. The permanent magnet traction electric drive system according to claim 1, wherein: The permanent magnet traction electric drive system further includes a four-quadrant rectifier, a traction inverter, an auxiliary inverter, and a three-phase filter capacitor, and the four-quadrant rectifier, the traction inverter, the auxiliary inverter, and the three-phase filter capacitor are integrated into a converter system cabinet.

3. The permanent magnet traction electric drive system according to claim 2, wherein: The permanent magnet traction electric drive system further includes a main contactor, a pre-charge contactor, and a three-pole isolation contactor, and the main contactor, the pre-charge contactor, and the three-pole isolation contactor are integrated into a contactor box.

4. The permanent magnet traction electric drive system according to claim 3, wherein: The main contactor, the pre-charge contactor, and the three-pole isolation contactor are partitioned and arranged in the contactor box.

5. The permanent magnet traction electric drive system according to claim 3, wherein: The permanent magnet traction electric drive system further includes a permanent magnet traction motor, and the permanent magnet traction motor includes: A motor stator core, provided with a monitoring winding wire hole and / or a monitoring winding wire groove, a monitoring winding is arranged in the monitoring winding wire hole and / or the monitoring winding wire groove, and the monitoring winding is configured to be able to detect the magnetic field distortion of the permanent magnet traction motor and output the magnetic field distortion as a distortion voltage.

6. The permanent magnet traction electric drive system according to claim 5, characterized in that, The permanent magnet traction motor further includes: A vibration sensor, close to the bearing part of the base of the permanent magnet traction motor; A motor power supply line, used to supply power and drive the permanent magnet traction motor, and current sensors are arranged in at least two of the three power supply lines of the motor power supply line; A voltage sensor, the monitoring winding is a three-phase symmetrical winding, and the voltage sensor is connected to the circuit of the winding to detect the output voltage of the monitoring winding.

7. The permanent magnet traction electric drive system according to claim 6, wherein: The three-pole isolation contactor is connected between the traction inverter of the permanent magnet traction motor and the body of the permanent magnet traction motor.

8. The permanent magnet traction electric drive system according to claim 6, wherein: When the permanent magnet traction motor operates normally, the voltage waveform output by the monitoring winding is a sine wave.

9. The permanent magnet traction electric drive system according to claim 6, wherein: When there is an inter-turn short circuit in the permanent magnet traction motor, the current sensor outputs a negative sequence current; And / or, when there is a phase-to-phase short circuit in the permanent magnet traction motor, the voltage sensor detects the distortion voltage output by the monitoring winding and detects multiple k1-order harmonics, and the vibration sensor detects that the vibration acceleration exceeds a preset acceleration; And / or, when the permanent magnet of the permanent magnet traction motor is demagnetized, the voltage sensor detects that the effective value of the voltage output by the monitoring winding decreases; And / or, the permanent magnet of the permanent magnet traction motor is broken, and the voltage sensor detects the distorted voltage output by the monitoring winding and detects a plurality of n1th harmonics.

10. An orbital vehicle, characterized in that, Comprising; The permanent magnet traction electric drive system according to any one of claims 1-9.

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