Bogie driven by stator-free motor

Abstract

A bogie driven by a stator-free motor comprises a framework, a first wheel pair, a second wheel pair, a driving mechanism and a gear box. The first wheel pair and the second wheel pair are elastically connected with the framework, the driving mechanism is arranged on the framework, output shafts are arranged at the two ends of the driving mechanism respectively, and the driving mechanism is connected to the first wheel pair and the second wheel pair through gear boxes; the driving mechanism is an axial magnetic flux three-phase asynchronous contra-rotating stator-free double-rotor motor. The front wheel pair and the rear wheel pair of the bogie are respectively driven by the double output shafts of the stator-free motor, so that the weight of the motor is obviously reduced, the overall driving force is greatly improved, and a development direction for improving the traction force of a driving system of a high-speed rail motor car and a traction locomotive in the future is provided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of rail transport technology, and particularly relates to a bogie driven by a statorless motor. BACKGROUND

[0002] Due to the design principle and structure of the differential, the structure and installation space of the steam locomotive, there is no differential between the locomotive wheel pairs, and theoretically the locomotive wheel has more sliding friction in the actual working process. In addition, in order to increase the friction between the locomotive wheel and the steel rail, sand is often sprayed on the steel rail, and the wheel tread of the locomotive wheel pair is seriously worn and often needs to be replaced. After the electric drive is changed, the power bogie is driven by a motor, and the differential drive between the wheel pairs is realized by independent motors, which reduces the wear of the wheel tread and the steel rail. Document CN201020593721.5 gives a design scheme of a single motor double shaft longitudinal drive hybrid wheel pair power bogie. Although the use of a single motor can reduce the number of motors, the double shaft extension motor is used in this scheme, and the motor shaft must provide driving torque for two wheel pairs, that is, the load torque of the motor is doubled under the condition that the rated speed of the motor is the same. The volume and weight of the motor are significantly increased, which is very difficult for the small space of the bogie. In addition, the output shafts on both sides of the double shaft extension motor are essentially the same shaft. Due to the different wear of the two wheel pairs of the same bogie, the wheel diameter will be different. If the same motor is used to drive the two wheel pairs through gear reduction, the wear of the wheel and the steel rail will be aggravated, so there are serious problems in the actual use of this technical scheme. SUMMARY

[0003] The purpose of the present application is to provide a bogie driven by a statorless motor to solve the above problems.

[0004] To achieve the above purpose, the present application adopts the following technical scheme: A bogie driven by a statorless motor, comprising a frame, a first wheel pair, a second wheel pair, a driving mechanism and a gear box; the first wheel pair and the second wheel pair are elastically connected to the frame, the driving mechanism is arranged on the frame, and the two ends of the driving mechanism are respectively provided with output shafts and connected to the first wheel pair and the second wheel pair through the gear box. The driving mechanism is an axial flux three-phase asynchronous counter-rotating statorless double rotor motor.

[0005] Further, the statorless double rotor motor includes a pair of two rotors that are mutually reversed, each rotor is respectively connected with a first output shaft and a second output shaft, and the first output shaft and the second output shaft drive the first wheel pair and the second wheel pair through independent gear boxes.

[0006] Further, the gear box comprises a first gear box and a second gear box, the first gear box is connected with the first output shaft, and the second gear box is connected with the second output shaft.

[0007] Further, when the two rotors of the statorless double-rotor motor are perpendicular to the first wheel pair and the second wheel pair, the first gear box comprises a first wheel shaft, an output bull gear and a pinion, the output bull gear is coaxially connected with the first wheel shaft, the first output shaft is connected with the pinion, and the pinion and the output bull gear are engaged.

[0008] Further, the second gear box comprises a second wheel shaft, an output bull gear and a pinion, the output bull gear is coaxially connected with the second wheel shaft, the second output shaft is connected with the pinion, and the pinion and the output bull gear are engaged.

[0009] Further, the first output shaft or the second output shaft is connected with the pinion through a universal joint, a transmission rod and a telescopic spline.

[0010] Further, when the two rotors of the statorless double-rotor motor are parallel to the first wheel pair and the second wheel pair, the first output shaft is connected with the pinion, the pinion is engaged with a bull gear, the second output shaft of the statorless motor is connected with a pinion gear, the pinion gear is connected with a bull gear through a chain, and the bull gear is installed on the second wheel pair; the bull gear is installed on the first wheel pair.

[0011] Further, when the two rotors of the statorless double-rotor motor are perpendicular to the first wheel pair and the second wheel pair, the first wheel pair and the second wheel pair are elastically connected with the frame through bearings and springs.

[0012] Further, the bolster is connected with the frame through elastic suspension, and a centering disc is arranged at the upper middle part of the bolster.

[0013] Further, when the two rotors of the statorless double-rotor motor are parallel to the first wheel pair and the second wheel pair, one side of the statorless motor base is fixed on a rotating seat capable of rotating around the first wheel shaft, and the other side of the statorless motor base is fixed with the bolster through an elastic connecting seat.

[0014] Compared with the prior art, the present application has the following technical effects: The bogie driven by the statorless motor has the following advantages: compared with the single motor with the same volume and weight and the same ground speed, the power of the double-rotor motor is doubled under the condition of the same rotating speed; the torque density and power density of the statorless motor are doubled under the condition of the same weight, and the double-rotor motor has the characteristics of free output of two shafts, so that the rotating speed difference of different wheel pairs is naturally solved, the driving force of the power bogie is improved, the weight of the power bogie is reduced, and the manufacturing cost is significantly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic view of the basic structure of the bogie.

[0016] Figure 2 It is a side view schematic diagram of the bogie of the present invention.

[0017] Figure 3 Schematic diagram of the statorless motor tandem structure of the bogie of the present invention.

[0018] Figure 4 Schematic diagram of the statorless motor horizontal structure of the bogie of the present invention.

[0019] Among them: 1 - frame, 2 - first wheel pair, 3 - second wheel pair, 4 - elastic suspension, 5 - centering plate, 6 - statorless motor, 11 - first output shaft, 12 - second output shaft, 19 - first reducer, 20 - second reducer, 21 - first wheel axle, 22 - second wheel axle, 23 - universal joint, 24 - telescopic spline, 25 - transmission rod, 26 - brake, 27 - rocker, 28 - small gear, 29 - large gear, 30 - magnet, 31 - small sprocket, 32 - large sprocket, 33 - chain. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0023] Embodiment 1 Please refer to Figures 1-3 A bogie driven by a non-stator motor, comprising a frame 1, a first wheel set 2, a second wheel set 3, a spring suspension 4, a bolster 27, a centering disc 5, a non-stator motor 6, a brake disc and a suspension system, wherein the first wheel set 2 and the second wheel set 3 are connected to the frame 1 through bearings and springs, the bolster 27 is connected to the frame 1 through the spring suspension 4, the centering disc 5 is arranged at the upper middle part of the bolster 27, a first speed reducer 19 is connected to the frame 1 through a spring pad, an output gear 29 of the first speed reducer 19 is coaxially connected to a first wheel shaft 21, the non-stator motor 6 is fixed below the bolster 27, a first output shaft 11 of the non-stator motor 6 is connected to a pinion 28 through a universal joint 23, a transmission rod 25 and a telescopic spline 24, and the pinion 28 is engaged with the output gear 29; the non-stator motor 6 is an axial flux three-phase asynchronous double-rotor motor, a first rotor comprises a first iron core, an armature winding and the first output shaft 11, and a second rotor comprises a second iron core, a metal squirrel cage and a second output shaft 12. The armature winding on the first rotor of the non-stator motor is connected to an external variable frequency power supply through a rotating conductive slip ring. When the variable frequency power supply supplies three-phase alternating current to the armature winding, the same size and opposite direction torques are generated between the first rotor and the second rotor to make the first rotor and the second rotor rotate in opposite directions and drive the first speed reducer and the second speed reducer through the first output shaft and the second output shaft to drive the first wheel set and the second wheel set to rotate in the same forward direction. Since the first rotor and the second rotor of the non-stator motor are not mechanically connected and can rotate freely, they can naturally adapt to the slight speed difference of the wheels of the two wheel sets caused by the difference in the diameters of the wheels due to wear to avoid sliding and reduce the wear of the wheels and the rails. Since the non-stator motor adopts double-shaft output, the total output torque is twice that of the conventional structure motor of the same volume, so the motor power and traction can be greatly improved without changing the motor weight. The use of the non-stator motor can reduce the consumption of electrical materials and significantly reduce the manufacturing cost of the motor. The reason why the non-stator motor in this example is an axial flux three-phase asynchronous double-rotor motor is that the axial flux motor is easier to produce using modern motor weaving technology, especially when the axial series multi-gap axial flux structure is adopted, the torque density and power density can be further improved. In addition, the motor in the present application is installed on the bolster, which greatly reduces the unsprung mass and is beneficial to prolong the service life of the motor and the shock absorber springs.

[0024] Embodiment 2 Please refer to Figure 4The bogie driven by the statorless motor comprises a frame 1, a first wheel pair 2, a second wheel pair 3, an elastic suspension 4, a bolster 27, a centering disc 5, a statorless motor 6, a brake disc and a suspension system, wherein the first wheel pair 2 and the second wheel pair 3 are elastically connected with the frame 1 through bearings and springs, the bolster 27 is connected with the frame 1 through the elastic suspension 4, the centering disc 5 is arranged at the upper middle part of the bolster 27, a large gear 29 is arranged on the first wheel shaft, one side of the statorless motor 6 is fixed on a rotating seat capable of rotating around the first wheel shaft, the other side of the statorless motor 6 is fixed with the bolster 27 through an elastic connecting seat, a first output shaft 11 of the statorless motor 6 is connected with a small gear 28, the small gear 28 is engaged with the large gear 29 to form a first speed reducer, a second output shaft 12 of the statorless motor 6 is connected with a small chain wheel 31, the small chain wheel 31 and a large chain wheel 32 are linked through a chain 33 to form a second speed reducer, the statorless motor 6 is a permanent magnet DC non-commutator double-rotor motor, the inside of the statorless motor 6 is of a double-rotor structure, the first rotor comprises a first iron core, an armature winding and the first output shaft 11, and the second rotor comprises a second iron core, a magnetic steel 30 and the second output shaft 12. The armature winding on the first rotor of the statorless motor is connected with an external motor driver through a rotating conductive slip ring, when the motor driver supplies power to the armature winding, the same size and opposite direction torques are generated between the first rotor and the second rotor to make the first rotor and the second rotor rotate in opposite directions, and the first wheel pair and the second wheel pair are driven to rotate in the same forward direction through the first output shaft and the second output shaft respectively through the gear and the chain wheel. The conductive slip ring has three large current collector rings and five small current collector rings, the three large current collector rings are used for supplying power to the armature winding, two of the five small current collector rings are used for supplying power to a position sensor, and the other three are used for leading out a detection signal of the position sensor, the simplest position sensor adopts three Hall switches ICs. If a control scheme without a position sensor is adopted, the conductive slip ring only needs three large current collector rings. In order to prevent the instantaneous contact voltage from jumping due to the jumping of the brush on the surface of the collector ring, two or more brushes can be configured for each collector ring. The transverse arrangement of the motor can shorten the wheel pair wheelbase, which is beneficial to reducing the turning radius. The statorless motor adopts the permanent magnet DC non-commutator double-rotor motor, which can significantly improve the motor efficiency, reduce the motor weight and reduce the motor temperature rise.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A bogie driven by a statorless motor, characterized in that: The invention comprises a frame (1), a first wheel pair (2), a second wheel pair (3), a driving mechanism and a gear box; the first wheel pair (2) and the second wheel pair (3) are elastically connected to the frame (1); the driving mechanism is arranged on the frame (1); and output shafts are respectively arranged at both ends of the driving mechanism and are connected to the first wheel pair (2) and the second wheel pair (3) through the gear box; The driving mechanism is an axial flux three-phase asynchronous counter-rotating statorless dual-rotor motor (6).

2. The bogie driven by a statorless motor according to claim 1, characterized in that: The statorless dual-rotor motor (6) comprises a pair of two rotors rotating in opposite directions, each rotor being connected to a first output shaft (11) and a second output shaft (12), respectively. The first output shaft (11) and the second output shaft (12) respectively drive a first wheel pair (2) and a second wheel pair (3) through independent gear boxes.

3. The bogie driven by a statorless motor according to claim 1, characterized in that: The gearbox comprises a first gearbox and a second gearbox, the first gearbox being connected to a first output shaft (11), and the second gearbox being connected to a second output shaft (12).

4. The bogie driven by a statorless motor according to claim 3, characterized in that: When the two rotors of the statorless dual-rotor motor are perpendicular to the first wheel pair (2) and the second wheel pair (3), the first gearbox includes a first wheel shaft (21), an output gear (29) and a pinion (28), the output gear (29) is coaxially connected to the first wheel shaft (21), the first output shaft (11) is connected to the pinion (28), and the pinion (28) and the output gear (29) are meshed.

5. The bogie driven by a statorless motor according to claim 4, characterized in that: The second gearbox comprises a second wheel shaft (22), an output gear (29) and a pinion (28), wherein the output gear (29) is coaxially connected to the second wheel shaft (22), the second output shaft (12) is connected to the pinion (28), and the pinion (28) and the output gear (29) are meshed.

6. The bogie driven by a statorless motor according to claim 5, characterized in that: The first output shaft (11) or the second output shaft (12) is connected to the pinion (28) via a universal joint (23), a transmission rod (25) and a telescopic spline (24).

7. The bogie driven by a statorless motor according to claim 3, characterized in that: When the two rotors of the statorless dual-rotor motor are parallel to the first wheel pair (2) and the second wheel pair (3), the first output shaft (11) is connected to the small gear (28), the small gear (28) is meshed with the large gear (29), the second output shaft (12) of the statorless motor (6) is connected to the small sprocket (31), the small sprocket (31) and the large sprocket (32) are linked by a chain (33), and the large sprocket (32) is installed on the second wheel pair (3); the large gear (29) is installed on the first wheel pair (2).

8. The bogie driven by a statorless motor according to claim 4, characterized in that: When the two rotors of the statorless dual-rotor motor are perpendicular to the first wheel pair (2) and the second wheel pair (3), the first wheel pair (2) and the second wheel pair (3) are elastically connected to the frame (1) through bearings and springs.

9. The bogie driven by a statorless motor according to claim 8, characterized in that: The bolster (27) is connected to the frame (1) through an elastic suspension (4), and a centering plate (5) is provided in the upper middle portion of the bolster (27).

10. The bogie driven by a statorless motor according to claim 7, characterized in that: When the two rotors of the statorless dual-rotor motor are parallel to the first wheel pair (2) and the second wheel pair (3), one side of the base of the statorless motor (6) is fixed on a rotating base that can rotate around the first wheel axis, and the other side of the base of the statorless motor (6) is fixedly connected to the bolster (27) through an elastic connecting base.

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