A grouped motor for a suspended transportation system

Abstract

The present invention discloses a grouped motor for a suspended transportation system, which comprises eight tooth-slot structure secondaries that are arranged in parallel along the running direction and fixed at equal intervals on the inner side of the top surface of the box girder. It also includes eight primaries corresponding to the eight secondaries respectively. All the primaries are of tooth-slot structure and the widths of their teeth and slots are equal to those of the secondaries. All the primaries are arranged in parallel along the running direction and fixed on the vehicle frame at equal intervals. Among them, the second primary is half a tooth misaligned backward relative to the first primary, the third primary is half a tooth misaligned backward relative to the second primary, and the fourth primary is half a tooth misaligned backward relative to the third primary. The fifth primary, the sixth primary, the seventh primary and the eighth primary are respectively left-right symmetric with the fourth primary, the third primary, the second primary and the first primary. The present invention simplifies the traditional mechanical transmission link by means of motor drive. The motor can provide driving force, gravity reduction force and guiding force simultaneously, and makes full use of the magnetic field generated by the current.

Description

Technical Field

[0001] The present invention relates to the technical field of transportation, and particularly to a modular motor for a suspended transportation system. Background Art

[0002] The suspended transportation system mainly includes suspended trains and suspended logistics transportation tools. Its advantage lies in that it runs in the air and occupies very little ground space resources. The suspended transportation system that is currently more applied is the suspended train, which is a new type of rail transit system that has been studied in China in recent years. Although it has good development prospects, there are still deficiencies in many aspects at present, mainly reflected in the wear of its rubber tires. The traditional sky train system adopts a mechanical drive mode with a rotary motor plus transmission components, and solid rubber tires are used as driving wheels and guide wheels to reduce running noise. During the operation of the system, the rubber wheels bear the weight of the whole vehicle and provide driving force through friction. After a long time, the wear is serious, resulting in high operation and maintenance costs. In addition, the solid tires bear the weight of the whole vehicle and will deform due to the force, resulting in poor stability of the train at higher speeds, which limits the development of suspended transportation technology. Summary of the Invention

[0003] The present invention discloses a modular motor for a suspended transportation system, which can simultaneously realize three functions of driving, weight reduction, and guiding, greatly reducing the burden on the driving wheels and guide wheels and improving the performance of the suspended transportation system.

[0004] The technical solution for achieving the object of the present invention is as follows:

[0005] A modular motor for a suspended transportation system, the suspended transportation system includes a box girder and a vehicle frame sleeved in the box girder, and the vehicle frame is connected with wheels that can travel on the running surface of the box girder; the modular motor includes eight secondaries that are arranged side by side and fixed at equal intervals on the inner side of the top surface of the box girder along the running direction; all the secondaries are of a tooth-slot structure, and the widths of their teeth and slots are equal; the teeth and slots of all the secondaries correspond; the modular motor further includes a first primary, a second primary, a third primary, a fourth primary, a fifth primary, a sixth primary, a seventh primary, and an eighth primary that respectively correspond to the eight secondaries, and all the primaries are of a tooth-slot structure and the widths of their teeth and slots are equal to the widths of the teeth and slots of the secondaries; all the primaries are arranged side by side and fixed on the vehicle frame at equal intervals along the running direction; wherein, the second primary is displaced backward by half a tooth relative to the first primary, the third primary is displaced backward by half a tooth relative to the second primary, and the fourth primary is displaced backward by half a tooth relative to the third primary; the fifth primary, the sixth primary, the seventh primary, and the eighth primary are respectively symmetrical to the fourth primary, the third primary, the second primary, and the first primary left and right.

[0006] A further alternative technical solution is as follows: the eight secondaries are replaced by seven secondaries; among the first primary, second primary, third primary, fourth primary, fifth primary, sixth primary, seventh primary, and eighth primary corresponding to the eight secondaries respectively, the two primaries in the middle position are replaced by one primary.

[0007] The beneficial effects of the present invention are as follows:

[0008] The use of the motor drive simplifies the traditional mechanical transmission link. The motor can simultaneously provide driving force, gravity reduction force, and guiding force, making full use of the magnetic field generated by the current. The structure of 8 - unit symmetric arrangement enables the overall system to provide very small fluctuations in gravity reduction force and driving force, which is beneficial to the smooth operation of the vehicle. At the same time, the symmetric arrangement also makes the force on the vehicle frame symmetric, without generating additional adverse torques. Among them, the normal force generated by the motor reduces the weight of the rubber - tired wheels, which can effectively reduce the wear of the rubber tires. At the same time, it can also reduce the deformation amount of the rubber tires during operation, which is beneficial to the smoothness of the vehicle at high speeds. Description of the Drawings

[0009] Figure 1 It is a side view of the overall structure of the suspended transportation system.

[0010] Figure 2 It is a front view of the overall structure of the suspended transportation system.

[0011] Figure 3 It is a top view of the grouped motor primary unit.

[0012] Figure 4 It is a three - dimensional schematic of the grouped motor Figure 1 .

[0013] Figure 5 It is a three - dimensional schematic of the grouped motor Figure 2 .

[0014] Figure 6 It is a simulation schematic of the grouped motor moving to the right.

[0015] Figure 7 It is a side view of the grouped motor.

[0016] Figure 8 It is a top view of motor primary 1, motor primary 2, motor primary 3, and motor primary 4 among 24 arrangement modes of the grouped motor primary unit.

[0017] The markings in the figure are: box girder 100, beam body 101, motor secondary unit 102, motor primary unit 200. Motor primary 1 (201), motor primary 2 (202), motor primary 3 (203), motor primary 4 (204), motor primary 5 (205), motor primary 6 (206), motor primary 7 (207), motor primary 8 (208). Detailed implementation manner

[0018] The suspended transportation system includes a box girder and a grouped motor. The grouped motor primary unit consists of 8 reluctance motor primaries. Every 4 motor primaries form a group, and there are two groups in total. Among them, motor primary 1, motor primary 2, motor primary 3, and motor primary 4 form a group, and motor primary 5, motor primary 6, motor primary 7, and motor primary 8 form a group. The two groups are arranged symmetrically.

[0019] In the box girder, the motor secondary is fixed on the inner top surface of the beam body. The motor secondary is of a tooth-slot structure, where the widths of the teeth and slots are equal, and the motor secondary unit is divided into 8 columns. Each column corresponds to one motor primary, and the width of each column is equal to the width of the motor primary. In the grouped motor primary unit, all the motor primaries are fixedly arranged side by side on the vehicle frame, and the distances between adjacent motor primaries are equal. The sizes of all the motor primaries are equal. Each motor primary is of a tooth-slot structure, and the widths of the teeth and slots are equal, and are equal to the widths of the teeth and slots of the motor secondary. The arrangement positions of motor primary 1 and motor primary 8 in the direction of vehicle frame travel are the same; the arrangement positions of motor primary 2 and motor primary 7 in the direction of vehicle frame travel are the same, and are offset by half the size of a tooth from motor primary 1; the arrangement positions of motor primary 3 and motor primary 6 in the direction of vehicle frame travel are the same, and are offset by one tooth size from motor primary 1; the arrangement positions of motor primary 4 and motor primary 5 in the direction of vehicle frame travel are the same, and are offset by one and a half tooth sizes from motor primary 1.

[0020] Each motor primary is arranged in alignment with a column of the motor secondary, and the magnetic poles of the motor primary and the motor secondary are of equal width. There is a certain gap in the vertical direction between the motor primary and the motor secondary, which is called the working gap. By means of the misalignment information and working gap information between the motor primary and the motor secondary, the conduction and cut-off of the motor primary current and the magnitude of the input current can be controlled, thereby controlling the magnitudes of the driving force, gravity reduction force, and guiding force.

[0021] Based on the above design, the motor has three functions: driving, weight reduction, and guiding, all of which are realized according to the principle of minimum reluctance. The principle of realizing the motor driving function is as follows: When there is a misalignment between the teeth of the motor primary and the teeth of the motor secondary, if there is a magnetic field in the teeth and slots, according to the principle of minimum reluctance, this magnetic field will generate a force, which can cause the motor to move, making the teeth of the motor primary and the teeth of the motor secondary face each other, achieving the purpose of reducing the reluctance to the minimum. Since the motor secondary is fixed on the beam, this force can only cause the motor primary to move, thereby driving the frame to move and realizing the driving of the vehicle. The principle of realizing the motor guiding function is as follows: When the frame deviates, it drives the motor primary to deviate together. Due to the deviation, the reluctance between the motor primary and the secondary increases, so the motor will generate a restoring force to drive the motor primary back to the original facing position to reduce the reluctance. This is the guiding force. The principle of realizing the motor weight reduction function is as follows: There is a working gap between the motor primary and the motor secondary. The smaller the working gap, the smaller the reluctance. Therefore, the magnetic field has a force to drive the distance between the motor primary and the secondary to decrease, that is, the electromagnetic suction force. The electromagnetic suction force makes the motor primary receive an upward force, thereby driving the frame to receive an upward force, and further reducing the supporting force of the rubber wheel tire, playing a role in weight reduction, that is, reducing the force on the rubber wheel tire.

[0022] The motor adopts a semi - working system, that is, at the same moment, only half of the number of motor primaries are powered on and working. Since the adjacent motor primaries are arranged with a half - tooth misalignment (except for the case of motor primary 4 and motor primary 5), so there is always half of the number of motor primaries that can provide driving forces in the same direction, while the other half of the number of motor primaries can provide driving forces in the opposite direction. Therefore, only half of the number of motor primaries can work at the same moment.

[0023] Eight motor primaries are used to form a grouped motor primary unit. Due to the semi - working system, the number of motor primaries working simultaneously is 4. Because the corresponding misalignment relationships between the 4 motor primaries and the teeth and slots of the motor secondary are different, the generated weight - reducing forces are not the same. By adopting a symmetric arrangement method, the balance of the weight - reducing forces can be ensured, so that no additional torque will be generated on the frame.

[0024] As the motor primary operates, the positional relationship between each motor primary and the secondary changes. When it runs to a certain position, half of the number of motor primaries that originally provided driving forces will stop working. Because if they continue to work, they will provide driving forces in the opposite direction. So at this time, the other half of the number of motor primaries will start working and continue to provide driving forces for the system.

[0025] The following is further described in conjunction with the accompanying drawings.

[0026] As Figure 1 、 Figure 2As shown in the figure, the suspended transportation system includes a box girder, a grouped motor secondary unit, and a primary unit. The primary unit is fixed on the vehicle frame and drives the vehicle frame to move. It consists of motor primary 1, motor primary 2, motor primary 3, motor primary 4, motor primary 5, motor primary 6, motor primary 7, and motor primary 8. In the box girder, the secondary unit is fixed on the inner top surface of the beam body and covers the entire line. The motor secondary is divided into 8 columns, and the width of each column is equal to the width of one motor primary. Each column corresponds to and aligns with one motor primary. The sizes of the teeth and grooves of the motor secondary are equal, and are also equal to the sizes of the teeth and grooves of the motor primary. A working gap is maintained between the motor primary and the secondary.

[0027] Figure 1 The suspended transportation system shown in the figure adopts a three-truck structure, and a grouped motor primary unit is arranged on each vehicle frame. The three trucks connect the car body through suspension columns.

[0028] As Figure 3 shown in the figure, in the grouped motor primary unit, 8 motor primaries are all fixed on the vehicle frame side by side at equal intervals. The sizes of all motor primaries are equal and are arranged in a symmetric manner. The arrangement positions of motor primary 1 and motor primary 8 in the direction of vehicle frame travel are the same; the arrangement positions of motor primary 2 and motor primary 7 in the direction of vehicle frame travel are the same, and are offset by half the size of a tooth from motor primary 1; the arrangement positions of motor primary 3 and motor primary 6 in the direction of vehicle frame travel are the same, and are offset by one tooth size from motor primary 1; the arrangement positions of motor primary 4 and motor primary 5 in the direction of vehicle frame travel are the same, and are offset by one and a half tooth sizes from motor primary 1. There are various such arrangement methods. As Figure 8 shown in the figure, the half-tooth offset relationship between motor primary 1, motor primary 2, motor primary 3, and motor primary 4 is given.

[0029] The 8 motor primaries are divided into two groups. Among them, motor primary 1, motor primary 2, motor primary 3, and motor primary 4 are one group, and motor primary 5, motor primary 6, motor primary 7, and motor primary 8 are the other group. The two groups are symmetrically arranged. The principle of system movement is illustrated by taking the group of motor primary 1, motor primary 2, motor primary 3, and motor primary 4. The working conditions of the other group are the same. As Figure 6 shown in the figure, before the motor runs, the teeth of the motor secondary unit are directly opposite to the teeth of motor primary 1, and motor primary 2, motor primary 3, and motor primary 4 are staggered by half a tooth width in sequence. Figure 6(a), (b), (c), and (d) represent four commutation positions in one working cycle of the motor. In one working cycle, the motor primary moves one tooth width and one slot width, that is, the working process is (a)-(b)-(c)-(d)-(a). Taking the rightward movement of the motor primary as an example, according to the working principle of the reluctance motor, from state (a) to (b), windings of motor primary 2 and motor primary 3 are energized; from (b) to (c), commutation is made to energize motor primary 3 and motor primary 4; from (c) to (d), commutation is made to energize motor primary 4 and motor primary 1; from (d) to (a), commutation is made again to energize motor primary 1 and motor primary 2. By commuting and energizing in this order, the motor primary can keep moving rightward, that is, driving the vehicle frame to move rightward. If it is required to move leftward, just energize in the reverse order of the above.

[0030] The above description has elaborated on the composition of each unit and its spatial placement. The following details the working mode of the system. First, determine the relative positions of the motor secondary unit and the primary unit, and then control the on-off of the current in the windings inside each motor primary according to the running needs. Table 1 gives the on-off logic of the system. When the motor is working, it is also necessary to monitor the size of the working gap. If the working gap becomes larger, the current can be controlled to increase; if the working gap becomes smaller, the current can be controlled to decrease.

[0031] In addition, as can be seen from Table 1, the on-off logic of motor primary 4 and motor primary 5 is the same. Further, if in order to save installation space, motor primary 4 and motor primary 5 can be combined into one motor primary, evolving the 8-group motor primary unit into a 7-group motor primary unit. The 7-group motor primary unit saves space compared to the 8-group one, but part of the guiding force is also reduced, which needs to be comprehensively considered in actual projects. Similarly, Figure 8 in, for various arrangement methods of the motor primary, the 8-group motor primary unit can be evolved into a 7-group motor primary unit.

[0032] Table 1 On-off Logic Table of Grouped Motor Primary Units

[0033]

[0034] Such as Figure 7As shown, the length of each motor primary unit in the grouped motor is 2430 mm, the width is 100 mm, the interval between two adjacent primary units is 10 mm, the widths of the teeth and slots of both the motor primary and secondary are 30 mm, and the motor primary iron core is made of silicon steel sheets. The cross-sectional size of the copper wire filled in the winding coil is 30 mm * 60 mm, the copper wire filling rate is selected as 60%, the working gap is 8 mm, and a current of 1.85 A is passed per square millimeter. The example case adopts a three-bogie structure, the length of each bogie is 2500 mm, 8 motor primaries are arranged on each bogie, and a total of 24 motor primaries need to be arranged. The length of the whole vehicle is 10000 mm, and the total load weight of the whole vehicle is 26 tons.

[0035] As Figure 6 As shown in and Table 1, the displacement in one working cycle is one tooth width and one slot width of the motor secondary, that is, 60 mm. Taking the first commutation process as an example, that is, (a)-(b), at this time, motor primaries 2, 2, 6, and 7 are energized and working. Since the system adopts a symmetric layout, the driving force and gravity reduction provided by motor primary 2 and motor primary 7 are the same, and the driving force and gravity reduction provided by motor primary 3 and motor primary 6 are the same. Taking motor primary 2 and motor primary unit 3 as an example, with a displacement of 3 mm as the step size, the horizontal thrust and normal force during the movement are obtained through finite element simulation as shown in the following table (the horizontal thrust is the driving force, and the normal force is the gravity reduction):

[0036] Table 2 Driving force and gravity reduction of the drive system during the first commutation process

[0037]

[0038] As can be seen from the above table, the forces generated by motor primary 2 and motor primary 33 are different. By symmetrically arranging motor primary 7 and motor primary 6 on the vehicle frame, the total resultant force generated by the system will not produce additional torque. Since the embodiment adopts a three-bogie structure and there are three motor primaries 2, and motor primary 7 is symmetrically arranged with motor primary 2 and the force generation situation is the same, the total thrust in the above table is six times the resultant force of motor primary 2 and motor primary 3, and the same is true for the total normal force and total guiding force of the system.

[0039] When the vehicle frame shows an offset phenomenon, each motor primary and the motor secondary will no longer be directly opposite. At this time, the working motor will generate a guiding force. The guiding force obtained through finite element simulation with a step size of 7.5 mm within the working cycle of motor primary 2 and a step size of 1 mm for the vehicle frame offset is shown in the following table.

[0040] Table 3 Guiding force situation of the drive system during the first commutation process

[0041]

[0042] As can be seen from Table 2 and Table 3, the drive system of the embodiment can provide relatively stable thrust for the suspended transportation tool, with an average value of 26.11 KN. It can provide relatively stable normal force, with an average value of 196.61 KN, and can provide a relatively large guiding force. For example, when the offset is 5 mm, the system can provide a maximum guiding force of 8494 N. Considering that the load of a transportation tool with a scale of about 10 meters is about 26 tons (260 KN), the acceleration that the embodiment system can provide is about 0.1, and the vehicle weight can be reduced by 75%. Therefore, the system can provide sufficient driving force, gravity reduction force, and guiding force. The working clearance provided by the embodiment is 10 mm. If a greater force is required, the working clearance can be considered to be reduced to 8 mm. The smaller the working clearance, the greater the force that the system can provide.

[0043] In summary, the grouped motors can provide sufficient and relatively stable driving force and gravity reduction force, can provide non-contact guiding force, and can effectively improve the performance of the suspended transportation tool.

Claims

1. A grouped motor for a suspended transportation system, characterized in that the suspended transportation system includes a box girder and a vehicle frame sleeved in the box girder, and the vehicle frame is connected with wheels that can travel on the running surface of the box girder; the grouped motor includes eight secondaries that are arranged side by side and fixed at equal intervals on the inner side of the top surface of the box girder along the running direction; all the secondaries are of a tooth-slot structure, and the widths of their teeth and slots are equal; the teeth and slots of all the secondaries correspond to each other; the grouped motor further includes a first primary (201), a second primary (202), a third primary (203), a fourth primary (204), a fifth primary (205), a sixth primary (206), a seventh primary (207), and an eighth primary (208) that respectively correspond to the eight secondaries. All the primaries are of a tooth-slot structure, and the widths of their teeth and slots are equal to the widths of the teeth and slots of the secondaries; all the primaries are arranged side by side and fixed on the vehicle frame at equal intervals along the running direction; among them, the second primary (202) is displaced backward by half a tooth relative to the first primary (201), the third primary (203) is displaced backward by half a tooth relative to the second primary (202), and the fourth primary (204) is displaced backward by half a tooth relative to the third primary (203). The fifth primary (205), the sixth primary (206), the seventh primary (207), and the eighth primary (208) are respectively symmetric left and right with the fourth primary (204), the third primary (203), the second primary (202), and the first primary (201).

2. The modular motor for a suspended transportation system according to claim 1, characterized in that, the eight secondaries are replaced by seven secondaries; among the first primary (201), the second primary (202), the third primary (203), the fourth primary (204), the fifth primary (205), the sixth primary (206), the seventh primary (207), and the eighth primary (208) that respectively correspond to the eight secondaries, the two primaries located in the middle position are replaced by one primary.

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