Bullet train motor system capable of efficiently operating at different speeds

Abstract

The invention relates to the technical field of bullet train power supply, and provides a bullet train motor system capable of efficiently operating at different speeds, comprising a transformer, a first rectifier, a second rectifier and a traction motor which are electrically connected in sequence, the traction motor comprises a motor controller and a motor main body, and the motor main body comprises a stator and a rotor. The rotor comprises a first winding and a second winding which are wound on the stator, the input end of the motor controller is connected with the output end of the second rectifier, the output end of the motor controller is connected with the first winding and the second winding, and the motor controller controls the first winding and the second winding to be connected in parallel when the speed of the motor train unit is higher than the preset speed. The motor controller controls the first winding and the second winding to be connected in series when the speed of the motor train unit is lower than or equal to a preset speed. The motor controller can automatically adjust the connection mode of the windings according to the actual running speed of the motor train unit, it is ensured that the motor body can keep the optimal working state at different speeds, and the running stability and reliability of the motor train unit can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of power supply for motor vehicles, and in particular to a motor vehicle motor system which operates efficiently at different speeds. Background Art

[0002] AC-DC-AC EMUs are nonlinear and impactful, and need to transform the high-voltage AC power of the power grid into low-voltage AC power, and then go through primary and secondary rectification to supply AC power to the traction motor. Since the EMU runs at a high speed, generally 200km / h to 350km / h, the speed is lower during the start-stop phase and when passing through bridges and tunnels, generally 0 to 100km / h. However, at different driving speeds, the torque of the traction motor is always fixed, resulting in low efficiency of the traction motor at low speeds. Summary of the invention

[0003] The purpose of the present invention is to provide a motor vehicle motor system that operates efficiently at different speeds, aiming to solve the technical problem that the existing traction motor is inefficient at low speeds.

[0004] The present application provides a motor system for a motor vehicle that operates efficiently at different speeds. The motor system for the motor vehicle includes a transformer, a first rectifier, a second rectifier and a traction motor that are electrically connected in sequence. The transformer is used to reduce the voltage and send it to the first rectifier. The first rectifier is used to convert alternating current into direct current. The second rectifier is used to convert direct current into alternating current. The traction motor includes a motor controller and a motor body. The motor body includes a stator core, a first winding and a second winding both wound around the stator core. The input end of the motor controller is connected to the output end of the second rectifier, and the output end of the motor controller is connected to the first winding and the second winding respectively. The motor controller controls the first winding and the second winding to be connected in parallel when the motor unit is higher than a preset speed, and controls the first winding and the second winding to be connected in series when the motor unit is lower than or equal to a preset speed.

[0005] In one embodiment, the motor controller includes a first transistor, a second transistor, a third transistor and a fourth transistor, the first end of the first winding is connected to the emitter of the first transistor, the second end of the first winding is simultaneously connected to the collector of the second transistor and the first end of the second winding, the first end of the second winding is simultaneously connected to the emitter of the third transistor, the second end of the second winding is connected to the collector of the fourth transistor, and the first winding and the second winding are connected.

[0006] In one embodiment, the motor controller includes a first diode, an anode of the first diode is connected to the emitter of the second transistor, and a cathode of the first diode is connected to the emitter of the first transistor.

[0007] In one embodiment, the motor controller includes a second diode, an anode of the second diode is connected to the collector of the second transistor, and a cathode of the second diode is connected to the collector of the first transistor.

[0008] In one embodiment, the motor controller includes a third diode, an anode of the third diode is connected to the emitter of the fourth transistor, and a cathode of the third diode is connected to the emitter of the third transistor.

[0009] In one embodiment, the motor controller includes a fourth diode, an anode of the fourth diode is connected to the collector of the fourth transistor, and a cathode of the fourth diode is connected to the collector of the third transistor.

[0010] In one embodiment, the transformer includes a primary coil and a secondary coil coupled to each other, the primary coil is provided with a first center tap and a second center tap, the secondary coil has a third center tap, and the total number of turns of the primary coil is greater than the total number of turns of the secondary coil.

[0011] In one embodiment, the transformer includes an insulating plate, the insulating plate is electroplated with a plurality of pads, and the primary coil and the secondary coil are both integrated on the insulating plate and welded to different pads.

[0012] In one embodiment, the pad includes a nickel layer and a gold layer, and the gold layer covers the nickel layer.

[0013] In one embodiment, the wire diameters of the primary coil and the secondary coil are 0.02 mm to 0.20 mm.

[0014] In one embodiment, the primary coil and the secondary coil are resistance welded to the corresponding welding pads respectively.

[0015] In one embodiment, the thickness of the nickel layer is greater than the thickness of the gold layer.

[0016] In one embodiment, the turns ratio of the primary coil to the secondary coil is 2-3:1.

[0017] In one of the embodiments, the maximum DC resistance of the primary coil is 1.8.

[0018] In one embodiment, the maximum DC resistance of the secondary coil is 0.5.

[0019] In one embodiment, the number of turns between the first end of the primary coil and the first center tap: the number of turns between the first center tap and the second center tap: the number of turns between the second center tap and the end of the primary coil = 1:10~20:1.

[0020] In one embodiment, the first rectifier is connected to the input end of the second rectifier through a first regulating module, and the EMU motor system also includes a backup battery module and a voltage stabilization control module. The backup battery module is connected to the input end of the second rectifier through a second regulating module, and the voltage stabilization control module is electrically connected to the first regulating module and the second regulating module respectively.

[0021] In one embodiment, when the output voltage of the first rectifier is less than or equal to a first preset voltage, the voltage regulation control module outputs a first signal and a second signal; the first regulation module outputs a first voltage and a third signal according to the first signal, and the first voltage is the output voltage of the first regulation module; the second regulation module outputs a second voltage and a fourth signal according to the second signal; and when the first voltage is less than or equal to a second preset voltage, the second rectifier outputs the second voltage according to the third signal and the fourth signal.

[0022] The beneficial effects of the motor system for a motor vehicle that operates efficiently at different speeds provided by the present invention are as follows: when the speed of the EMU is higher than a preset speed, the motor controller controls the first winding and the second winding to be connected in parallel, thereby reducing the rate of change of the equivalent inductance of the motor body, reducing the high-speed back electromotive force, increasing the working current of the winding, and increasing the working torque; when the speed of the EMU is lower than or equal to the preset speed, the motor controller controls the first winding and the second winding to be connected in series, at which time the rate of change of the equivalent inductance of the motor body increases, and because the torque is proportional to the product of the current and the rate of change of the inductance, the current required to generate the torque is reduced, thereby improving the efficiency of the motor. Based on this, the traction motor can achieve both low-speed high efficiency and high-speed high-torque capabilities, which require two single motors to achieve respectively, by combining them in a dual-winding mode on one motor body, expanding the performance application range of the motor body to meet the needs of high and low speeds and light and heavy loads. It is more versatile, improves power transmission efficiency and motor performance, and solves the technical problem of low efficiency of existing traction motors at low speeds. The motor controller can automatically adjust the connection method of the winding according to the actual operating speed of the EMU, ensuring that the motor body can maintain the best working state at different speeds, which helps to improve the operating stability and reliability of the EMU. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A schematic diagram of a motor vehicle motor system that operates efficiently at different speeds provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the structure of a transformer for a motor vehicle motor system provided by an embodiment of the present invention;

[0026] Figure 3 Another schematic diagram of a motor vehicle motor system provided by an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of a state of a traction motor of a motor vehicle motor system provided by an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of another state of the traction motor of the motor vehicle motor system provided in an embodiment of the present invention.

[0029] Among them, the reference numerals in the figure are:

[0030] 100. Transformer; 110. Primary coil; 111. First center tap; 112. Second center tap; 120. Secondary coil; 121. Third center tap; 130. Insulating plate; 140. Pad; 200. First rectifier; 300. Second rectifier; 400. Traction motor; 410. Motor controller; 411. First triode; 412. Second triode; 413. Third triode; 414. Fourth triode; 415. First diode; 416. Second diode; 417. Third diode; 418. Fourth diode; 420. Motor body; 421. First winding; 422. Second winding; 510. Backup battery module; 520. First regulating module; 530. Second regulating module; 540. Voltage stabilization control module; 541. Pressure measuring unit; 542. Control unit. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, not all references are to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics may be combined in any suitable manner.

[0033] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Embodiment 1

[0037] Combination Figures 1 to 3 The present application provides a motor vehicle motor system that operates efficiently at different speeds. The motor vehicle motor system that operates efficiently at different speeds includes a transformer 100, a first rectifier 200, a second rectifier 300 and a traction motor 400 that are electrically connected in sequence.

[0038] The transformer 100 is used to reduce the voltage and then send it to the first rectifier 200. The transformer 100 is responsible for reducing the input AC power (such as 220V or 380V mains power) to a voltage level suitable for the first rectifier 200 to process.

[0039] The first rectifier 200 is used to convert AC power into DC power. The first rectifier 200 converts the AC power output by the transformer 100 into DC power. Optionally, the first rectifier 200 converts the AC power into DC power through a rectifier bridge.

[0040] The second rectifier 300 is used to convert direct current into alternating current. The traction motor 400 includes a motor controller 410 and a motor body 420. The motor body 420 includes a stator core, a first winding 421 and a second winding 422 both wound around the stator core. The input end of the motor controller 410 is connected to the output end of the second rectifier 300, and the output end of the motor controller 410 is respectively connected to the first winding 421 and the second winding 422. The motor controller 410 controls the first winding 421 and the second winding 422 to be connected in parallel when the EMU speed is higher than a preset speed, and controls the first winding 421 and the second winding 422 to be connected in series when the EMU speed is lower than or equal to a preset speed.

[0041] It should be noted that the winding parameters of the ordinary motor body 420, including the number of coil turns and the wire diameter, are fixed and immutable. However, the winding parameters of the traction motor 400 need to take into account different vehicle speed conditions at the same time. The higher the number of coil turns, the greater the torque that can be generated in theory. However, since the traction motor 400 controls its speed and power through a closed loop, the motor body 420 generates a large back electromotive force under high-speed conditions, and cannot provide sufficient drive current to generate sufficient torque. It can only be transported with light loads and cannot meet the requirements of high-speed heavy-load transportation; under low-speed conditions, heavy loads will inevitably lead to excessive current in the motor body 420, causing a decrease in efficiency and failing to obtain good operating performance.

[0042] When the speed of the EMU is higher than the preset speed, the motor controller 410 controls the first winding 421 and the second winding 422 to be connected in parallel, thereby reducing the equivalent inductance change rate of the motor body 420, reducing the high-speed back electromotive force, increasing the winding working current, and increasing the working torque; when the speed of the EMU is lower than or equal to the preset speed, the motor controller 410 controls the first winding 421 and the second winding 422 to be connected in series. At this time, the equivalent inductance change rate of the motor body 420 increases. Since the torque is proportional to the product of the current and the inductance change rate, the current required to generate torque is reduced, thereby improving the motor efficiency. Based on this, the traction motor 400, while maintaining its external structure, can achieve both low-speed high efficiency and high-speed high torque capabilities, which would require two single motors to achieve respectively, by combining them in a dual-winding mode on a single motor body 420, thereby expanding the performance application range of the motor body 420 to meet the requirements of high and low speeds and light and heavy loads, providing greater versatility, improving power transmission efficiency and motor performance, and solving the technical problem of low efficiency of the existing traction motor 400 at low speeds. The motor controller 410 can automatically adjust the connection method of the winding according to the actual operating speed of the EMU, ensuring that the motor body 420 can maintain the best working state at different speeds, thereby helping to improve the operating stability and reliability of the EMU.

[0043] Specifically, the preset speed is 100 km / h to 200 km / h. For example, the preset speed is 100 km / h, 120 km / h, 150 km / h, 180 km / h, and 200 km / h.

[0044] In some embodiments, in combination Figure 4 and Figure 5 The motor controller 410 includes a first transistor 411, a second transistor 412, a third transistor 413 and a fourth transistor 414. The first end of the first winding 421 is connected to the emitter of the first transistor 411, the second end of the first winding 421 is connected to the collector of the second transistor 412 and the first end of the second winding 422 at the same time, the first end of the second winding 422 is connected to the emitter of the third transistor 413 at the same time, the second end of the second winding 422 is connected to the collector of the fourth transistor 414, and the first winding 421 and the second winding 422 are connected.

[0045] Combination Figure 4 When the first transistor 411, the second transistor 412, the third transistor 413 and the fourth transistor 414 are all turned on, the first winding 421 and the second winding 422 work in parallel. Figure 5 When the first transistor 411 and the fourth transistor 414 are turned on and the second transistor 412 and the third transistor 413 are turned off, the first winding 421 and the second winding 422 work in series. The series and parallel working mode switching of the first winding 421 and the second winding 422 does not require additional switch control.

[0046] Based on this, through the combined control of the four transistors, the connection modes of the two windings can be automatically switched without the need for additional mechanical switches or complex electronic switch circuits, thereby simplifying the design of the motor controller 410. Compared with mechanical switches, the electronic switch (transistor) is used for switching, so the response speed is faster, thereby ensuring that the motor body 420 can quickly reach the optimal working state at different speeds.

[0047] In one embodiment, in combination Figure 4 and Figure 5 The motor controller 410 includes a first diode 415, the anode of the first diode 415 is connected to the emitter of the second transistor 412, and the cathode of the first diode 415 is connected to the emitter of the first transistor 411. The first diode 415 is unidirectional, which can prevent the current from not passing through the first winding 421 and the second transistor 412, and avoid the first winding 421 and the second transistor 412 from being short-circuited. During the operation of the motor body 420, the voltage and current in the motor controller 410 may fluctuate due to factors such as load changes and power supply fluctuations. The first diode 415 can suppress these fluctuations to a certain extent, ensuring that the motor controller 410 can work stably.

[0048] In one embodiment, in combination Figure 4 and Figure 5 The motor controller 410 includes a second diode 416, the anode of the second diode 416 is connected to the collector of the second transistor 412, and the cathode of the second diode 416 is connected to the collector of the first transistor 411. The second diode 416 is unidirectional, which can prevent the current from not passing through the first winding 421 and the first transistor 411, and avoid the first winding 421 and the first transistor 411 from short-circuiting. During the operation of the motor body 420, the voltage and current in the motor controller 410 may fluctuate due to factors such as load changes and power supply fluctuations. The second diode 416 can suppress these fluctuations to a certain extent, ensuring that the motor controller 410 can work stably.

[0049] In one embodiment, in combination Figure 4 and Figure 5The motor controller 410 includes a third diode 417, the anode of the third diode 417 is connected to the emitter of the fourth transistor 414, and the cathode of the third diode 417 is connected to the emitter of the third transistor 413. The third diode 417 is unidirectional, which can prevent the current from not passing through the second winding 422 and the fourth transistor 414, and avoid the second winding 422 and the fourth transistor 414 from being short-circuited. During the operation of the motor body 420, the voltage and current in the motor controller 410 may fluctuate due to factors such as load changes and power supply fluctuations. The third diode 417 can suppress these fluctuations to a certain extent, ensuring that the motor controller 410 can work stably.

[0050] In one embodiment, the motor controller 410 includes a fourth diode 418, the anode of the fourth diode 418 is connected to the collector of the fourth transistor 414, and the cathode of the fourth diode 418 is connected to the collector of the third transistor 413. The fourth diode 418 is unidirectional, which can prevent the current from not passing through the second winding 422 and the third transistor 413, and avoid the second winding 422 and the third transistor 413 from short-circuiting. During the operation of the motor body 420, the voltage and current in the motor controller 410 may fluctuate due to factors such as load changes and power supply fluctuations. The fourth diode 418 can suppress these fluctuations to a certain extent, ensuring that the motor controller 410 can work stably.

[0051] In some embodiments, all leads of the first winding 421 and the second winding 422 are connected to the motor controller 410. The stator core uses lacquered wire of the same wire diameter, and the first winding 421 and the second winding 422 have the same winding direction, which makes the process simple and reliable and can further improve the slot fill rate.

[0052] In some embodiments, in combination Figure 1 and Figure 2 The transformer 100 includes a coupled primary coil 110 and a secondary coil 120. The primary coil 110 is provided with a first center tap 111 and a second center tap 112. The secondary coil 120 has a third center tap 121. The total number of turns of the primary coil 110 is greater than the total number of turns of the secondary coil 120, thereby achieving voltage reduction.

[0053] Based on this, the primary coil 110 adopts the first center tap 111 and the second center tap 112, and the secondary coil 120 adopts the third center tap 121. By changing the turns ratio between the primary coil 110 and the secondary coil 120, the first center tap 111, the second center tap 112 and the third center tap 121 can effectively adjust the output voltage of the transformer 100, prevent harmonic interference, provide a stable voltage source, and meet various voltage values ​​converted during use. Among them, the third center tap 121 of the secondary coil 120 can provide a low impedance path for the common mode current, thereby reducing the common mode current and common mode voltage on the coil, which is conducive to reducing electromagnetic interference.

[0054] In one embodiment, the transformer 100 includes an insulating plate 130, the insulating plate 130 is electroplated with a plurality of pads 140, the primary coil 110 and the secondary coil 120 are both integrated into the insulating plate 130 and welded to different pads 140, and the primary coil 110 and the secondary coil 120 are integrated into an insulating plate 130 by using winding technology and spot welding technology, thereby reducing the assembly requirements of multiple independent components in the traditional transformer 100, thereby significantly reducing the overall volume and weight of the transformer 100, so as to ensure that the transformer 100 is miniaturized and integrated.

[0055] Optionally, the insulating plate 130 is a ceramic plate.

[0056] In one embodiment, the pad 140 includes a nickel layer and a gold layer, and the gold layer covers the nickel layer, providing a high-quality welding interface for the welding process, so that the solder can be more easily and stably combined with the pad 140. The gold layer is not easily oxidized, and the pad 140 can be better stored and easily welded.

[0057] In one embodiment, the wire diameters of the primary coil 110 and the secondary coil 120 are 0.02 mm to 0.20 mm. Coils within this wire diameter range are easier to wind, which not only improves production efficiency but also reduces damage to the coils caused by mechanical stress during the winding process.

[0058] In one embodiment, the primary coil 110 and the secondary coil 120 are resistance welded to the corresponding pads 140. Resistance welding has the best welding reliability and can effectively ensure good contact between the lead ends of each winding and the pads 140. At the same time, resistance welding can form a low-resistance electrical connection to ensure that the current flows smoothly between the primary coil 110 and the secondary coil 120, reducing energy loss. Resistance welding melts the contact part of the pad 140 and the coil and re-solidifies to form a firm mechanical connection, thereby maintaining the stability of the structure of the transformer 100.

[0059] In one embodiment, the thickness of the nickel layer is greater than that of the gold layer. As the bottom layer, the nickel layer provides basic protection for the pad 140. The bonding force between the nickel layer and the insulating plate 130 is usually strong, which can ensure that the pad 140 is stably fixed in the transformer 100. At the same time, by increasing the thickness of the nickel layer and appropriately reducing the thickness of the gold layer, the material cost can be reduced while maintaining the performance of the pad 140.

[0060] Optionally, the nickel layer has a thickness of 2.5 μm to 8.0 μm.

[0061] Optionally, the thickness of the gold layer is less than or equal to 1.5 μm, and welding can be performed directly without gold removal during welding.

[0062] In one embodiment, the ratio of the total number of turns of the primary coil 110 to the total number of turns of the secondary coil 120 is 2 to 3: 1. When the turns ratio is 2 to 3: 1, the transformer 100 can be more efficient in the energy conversion process and reduce unnecessary energy waste.

[0063] In one embodiment, the maximum DC resistance of the primary coil 110 is 1.8 ohms. A lower DC resistance means less heat is generated when current passes through, thereby reducing energy loss during transmission. It should be noted that the DC resistance value of the primary coil 110 is not necessarily the smaller the better. Too small a DC resistance may cause excessive current, increase heat loss and temperature rise of the transformer 100; while too large a DC resistance may reduce the conversion efficiency of the transformer 100.

[0064] In one embodiment, the maximum DC resistance of the secondary coil 120 is 0.5 ohms. Lower DC resistance is conducive to less heat generated when current passes through the secondary coil 120, which helps to reduce energy loss during transmission and improve the overall efficiency of the transformer 100.

[0065] In one embodiment, the number of turns between the head end of the primary coil 110 and the first center tap 111: the number of turns between the first center tap 111 and the second center tap 112: the number of turns between the second center tap 112 and the end of the primary coil 110 = 1:10-20:1. The number of turns between the first center tap 111 and the second center tap 112 is relatively large, while the number of turns at the two ends is relatively small, which helps to achieve a larger voltage adjustment range while maintaining a lower voltage drop, and also helps to reduce mutual interference and electromagnetic noise between coils.

[0066] Optionally, the number of turns between the head end of the primary coil 110 and the first center tap 111 is 7, the number of turns between the first center tap 111 and the second center tap 112 is 82, and the number of turns between the second center tap 112 and the end of the primary coil 110 is 7.

[0067] Optionally, the total number of turns of the secondary coil 120 is 36.

[0068] In some embodiments, in combination Figure 3 The first rectifier 200 is connected to the input end of the second rectifier 300 through the first regulating module 520. The EMU motor system also includes a backup battery module 510 and a voltage stabilization control module 540. The backup battery module 510 is connected to the input end of the second rectifier 300 through the second regulating module 530. The voltage stabilization control module 540 is electrically connected to the first regulating module 520 and the second regulating module 530 respectively.

[0069] When the output voltage of the first rectifier 200 is less than or equal to the first preset voltage, it indicates that the first rectifier 200 is abnormal, and the voltage stabilization control module 540 outputs a first signal and a second signal. The first regulating module 520 outputs a first voltage and a third signal according to the first signal, and the first voltage is the output voltage of the first regulating module 520. The first regulating module 520 regulates the first voltage according to the first signal. The second regulating module 530 outputs a second voltage and a fourth signal according to the second signal, and the second regulating module 530 starts to start to ensure the power supply demand of the traction motor 400. The first signal, the second signal, the third signal and the fourth signal are all level signals.

[0070] When the first voltage of the second rectifier 300 is less than or equal to the second preset voltage, it indicates that the first regulating module 520 can no longer output voltage normally, and outputs the second voltage according to the third signal and the fourth signal, and switches to the second regulating module 530 for power supply to ensure the power supply demand of the traction motor 400.

[0071] As can be seen from the above, when an abnormality occurs in the first rectifier 200, the first regulating module 520 adjusts its output voltage to ensure the power supply demand of the traction motor 400. While the first regulating module 520 is still supplying power, the second regulating module 530 is controlled to start. After the second regulating module 530 is started, it is not directly switched to the second regulating module 530 for power supply, that is, the power of the backup battery module 510 is not consumed. Instead, when the first regulating module 520 cannot output normally, it is switched to the second regulating module 530 for power supply to ensure that when the second regulating module 530 is supplying power, there is enough power to supply power to the traction motor 400.

[0072] In one embodiment, in combination Figure 3The voltage stabilization control module 540 includes a control unit 542 and a pressure measuring unit 541. The control unit 542 is electrically connected to the pressure measuring unit 541, the first regulating module 520 and the second regulating module 530 respectively. The pressure measuring unit 541 monitors the voltage of the first rectifier 200, and outputs a fifth signal when the voltage of the first rectifier 200 is less than or equal to the first preset voltage. The fifth signal is a level signal. The control unit 542 outputs the first signal and the second signal according to the fifth signal. The pressure measuring unit 541 monitors the voltage of the first rectifier 200 in real time, and outputs a corresponding level signal to the control unit 542 when an abnormality occurs in the first rectifier 200, so that the control unit 542 performs corresponding control on the first regulating module 520 and the second regulating module 530 according to the corresponding level signal to ensure the power supply demand of the traction motor 400.

[0073] In some embodiments, the pressure measuring unit 541 monitors the voltage of the first rectifier 200. When the voltage of the first rectifier 200 is greater than the first preset voltage, it indicates that the first rectifier 200 is normal, and then outputs a sixth signal to the control unit 542. The control unit 542 outputs a seventh signal to the first regulating module 520 according to the sixth signal, and outputs an eighth signal to the second regulating module 530. The second regulating module 530 is configured to not work according to the eighth signal. The first regulating module 520 is configured to convert the voltage of the first rectifier 200 according to the seventh signal.

[0074] Specifically, when the first rectifier 200 is working normally, that is, when the first voltage is greater than the first preset voltage (that is, when the second regulation module 530 is at rest), the backup battery module 510 stores energy to meet the power supply requirements of the traction motor 400 during the subsequent startup process of the second regulation module 530, and ensure the smoothness of switching to the second regulation module 530 for power supply.

[0075] The present application monitors the voltage of the first rectifier 200 in real time through the pressure measuring unit 541, and outputs a corresponding signal to the control unit 542 according to the voltage of the first rectifier 200, so that the control unit 542 controls the first regulation module 520 and the second regulation module 530 according to the corresponding signal to ensure the normal operation of the power supply circuit; and when an abnormality occurs in the first rectifier 200, seamlessly switch to the backup battery module 510 for power supply, and ensure that the power of the backup battery module 510 will not be wasted during the switching process.

[0076] Embodiment 2

[0077] The present application provides a motor vehicle group, which includes any one of the motor vehicle motor systems mentioned above that operates efficiently at different speeds, and will not be described in detail here.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor system for a motor vehicle that operates efficiently at different speeds, characterized in that: The EMU motor system includes a transformer, a first rectifier, a second rectifier and a traction motor which are electrically connected in sequence. The transformer is used to reduce the voltage and send it to the first rectifier. The first rectifier is used to convert AC power into DC power. The second rectifier is used to convert DC power into AC power. The traction motor includes a motor controller and a motor body. The motor body includes a stator core, a first winding and a second winding both wound around the stator core. The input end of the motor controller is connected to the output end of the second rectifier, and the output end of the motor controller is respectively connected to the first winding and the second winding. The motor controller controls the first winding and the second winding to be connected in parallel when the EMU speed is higher than a preset speed. The motor controller controls the first winding and the second winding to be connected in series when the EMU speed is lower than or equal to a preset speed.

2. The motor vehicle motor system for efficient operation at different speeds according to claim 1 is characterized in that: The motor controller includes a first transistor, a second transistor, a third transistor and a fourth transistor. The first end of the first winding is connected to the emitter of the first transistor, the second end of the first winding is simultaneously connected to the collector of the second transistor and the first end of the second winding, the first end of the second winding is simultaneously connected to the emitter of the third transistor, the second end of the second winding is connected to the collector of the fourth transistor, and the first winding and the second winding are connected.

3. The motor vehicle motor system for efficient operation at different speeds according to claim 2 is characterized in that: The motor controller comprises a first diode, wherein an anode of the first diode is connected to an emitter of the second transistor, and a cathode of the first diode is connected to an emitter of the first transistor; The motor controller includes a second diode, an anode of the second diode is connected to the collector of the second transistor, and a cathode of the second diode is connected to the collector of the first transistor.

4. The motor vehicle motor system for efficient operation at different speeds according to claim 2 is characterized in that: The motor controller comprises a third diode, the anode of the third diode is connected to the emitter of the fourth transistor, and the cathode of the third diode is connected to the emitter of the third transistor; The motor controller includes a fourth diode, an anode of the fourth diode is connected to the collector of the fourth transistor, and a cathode of the fourth diode is connected to the collector of the third transistor.

5. The motor vehicle motor system for efficient operation at different speeds according to any one of claims 1 to 4, characterized in that: The transformer includes a primary coil and a secondary coil coupled to each other, the primary coil is provided with a first center tap and a second center tap, the secondary coil has a third center tap, and the total number of turns of the primary coil is greater than the total number of turns of the secondary coil.

6. The motor vehicle motor system for efficient operation at different speeds according to claim 5 is characterized in that: The transformer comprises an insulating plate, the insulating plate is electroplated with a plurality of pads, the primary coil and the secondary coil are both integrated on the insulating plate and welded to different pads; the pads comprise a nickel layer and a gold layer, the gold layer covers the nickel layer.

7. The motor vehicle motor system for efficient operation at different speeds according to claim 6 is characterized in that: The wire diameters of the primary coil and the secondary coil are 0.02 mm to 0.20 mm; the primary coil and the secondary coil are resistance welded to the corresponding pads respectively; and the thickness of the nickel layer is greater than the thickness of the gold layer.

8. The motor vehicle motor system for efficient operation at different speeds according to claim 5 is characterized in that: The turns ratio of the primary coil to the secondary coil is 2-3:1, the maximum DC resistance of the primary coil is 1.8, and the maximum DC resistance of the secondary coil is 0.

5.

9. The motor vehicle motor system for efficient operation at different speeds according to any one of claims 1 to 4, characterized in that: The first rectifier is connected to the input end of the second rectifier through a first regulating module. The EMU motor system also includes a backup battery module and a voltage stabilization control module. The backup battery module is connected to the input end of the second rectifier through a second regulating module. The voltage stabilization control module is electrically connected to the first regulating module and the second regulating module respectively.

10. The motor vehicle motor system for efficient operation at different speeds according to claim 9, characterized in that: When the output voltage of the first rectifier is less than or equal to the first preset voltage, the voltage regulation control module outputs a first signal and a second signal; the first regulation module outputs a first voltage and a third signal according to the first signal, and the first voltage is the output voltage of the first regulation module; the second regulation module outputs a second voltage and a fourth signal according to the second signal; when the first voltage is less than or equal to the second preset voltage, the second rectifier outputs the second voltage according to the third signal and the fourth signal.

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