A motor with braking function

Abstract

The present invention provides a motor with a braking function, comprising a stator assembly and a rotor assembly, wherein the stator assembly comprises a stator core with mounting slots, and a stator coil arranged in the mounting slots, and further comprises a first braking module, wherein the first braking module comprises an eddy current conductor assembly arranged in each of the mounting slots, and a permanent magnet assembly sleeved outside the rotor assembly, wherein the eddy current conductor assembly comprises a first eddy current conductor and a first magnetic conductive back plate, wherein the first eddy current conductor is arranged at the opening end of the mounting slot, and the first magnetic conductive back plate is located in the magnetic conductive area between the first eddy current conductor and the stator coil; the permanent magnet assembly is arranged relative to the first eddy current conductor at the corresponding position. The present invention has the advantages of realizing the driving and braking buffering functions at the same time on the basis of the original motor size.

Description

Technical Field

[0001] The invention relates to the field of motor braking, and in particular to a motor with a braking function. Background Art

[0002] Existing motors have been widely used in high-speed, high-load, and high-precision control equipment such as high-speed trains and large machine tools. When controlling high-speed, high-load, and high-precision equipment, the motor needs to provide a driving force during normal operation, and also needs to provide sufficient braking force under strong impact loads to reset and stop the motor. It can be seen that motor braking is particularly critical for the safe and reliable application of motors.

[0003] However, the existing motors usually use springs, hydraulic cylinders or plastic material deformation to absorb energy. The energy absorption effect is poor under high load or impact load, the braking performance is unstable, and the motor is easily affected by external electromagnetic interference when running at high speed, causing the control system to fail. There is a risk of not being able to provide sufficient braking force, especially when used in high-speed, high-load and high-precision control equipment. There are great safety hazards, and there are safety hazards of motor resetting and stopping failure, which may lead to accidents such as casualties and equipment and property losses. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a motor that can simultaneously realize driving and braking buffer functions based on the original motor size.

[0005] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0006] A motor with a braking function comprises a stator assembly and a rotor assembly, wherein the stator assembly comprises a stator core with mounting slots and a stator coil arranged in the mounting slots, and further comprises a first braking module, wherein the first braking module comprises an eddy current conductor assembly arranged in each of the mounting slots, and a permanent magnet assembly sleeved outside the rotor assembly, wherein the eddy current conductor assembly comprises a first eddy current conductor and a first magnetic conductive back plate, wherein the first eddy current conductor is arranged at an open end of the mounting slot, and the first magnetic conductive back plate is located in a magnetic conductive area between the first eddy current conductor and the stator coil; the permanent magnet assembly is arranged relative to the first eddy current conductor at a corresponding position.

[0007] As a further improvement of the above technical solution:

[0008] The eddy current conductor assembly further includes two magnetic insulators, which are located in the magnetic conductive area and are disposed on both sides of the magnetic conductive back plate along the axial direction of the stator core to separate the magnetic conductive back plate from the stator core.

[0009] The motor also includes a second braking module for enhancing the braking force according to the braking force requirements at different positions of the motor, and the second braking module is correspondingly arranged at the position of the rotor assembly where the braking force needs to be enhanced; the second braking module is arranged parallel to the stator core and connected to the end surface of the stator core; the second braking module includes a second eddy current conductor and a second magnetic back plate, and the second magnetic back plate is sleeved on the outside of the second eddy current conductor.

[0010] When the motor is a rotating motor, the permanent magnet assembly is provided at a position of the rotor assembly corresponding to the second brake module;

[0011] When the motor is a linear motor, the permanent magnet assembly is located at the end of the rotor assembly close to the rotor external connection member when the motor is in the initial working state, and the braking distance of the motor is the axial movement distance of the permanent magnet assembly.

[0012] When the motor has a demand for enhanced initial-range braking force, the second brake module is connected to an end of the stator core close to the rotor external connector; when the motor has a demand for enhanced rear-range braking force, the second brake module is connected to an end of the stator core away from the rotor external connector; when the motor has a demand for enhanced mid-range braking force, the stator core is split into at least two sections, and the second brake module is arranged between adjacent sections of the stator core.

[0013] The length of the first eddy current conductor is greater than that of the first magnetic conductive back plate, and the first magnetic conductive back plate is arranged in the middle of the first eddy current conductor along the axial direction of the stator core; the length of the second eddy current conductor is equal to that of the second magnetic conductive back plate, and the two are arranged overlappingly.

[0014] One end of the first magnetic conductive back plate along the radial direction of the stator assembly is connected to the first eddy current conductor, and the other end of the first magnetic conductive back plate is in contact with the stator coil.

[0015] The rotor assembly includes a support shaft; the permanent magnet assembly is arranged coaxially with the support shaft, and the permanent magnet assembly includes a plurality of permanent magnets arranged axially and / or radially along the support shaft, and an annular sleeve with an annular groove, each of the permanent magnets is placed in the annular groove and is mounted on the support shaft through a fastener at the end of the annular sleeve.

[0016] When the motor is a linear motor, the annular sleeve is a non-magnetic sleeve.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] The present invention adds a first braking module to the motor, and the first braking module includes a first eddy current conductor and a first magnetic conductive back plate. The first eddy current conductor is arranged at the open end of the mounting groove, and the first magnetic conductive back plate is located in the magnetic conductive area between the first eddy current conductor and the stator coil; the permanent magnet assembly and the first eddy current conductor at the corresponding position are arranged relative to each other, and the overall layout is compact and the structure is simple. It does not need to occupy extra space in the motor, which greatly reduces the complexity of the motor when it is used as both a driving device and a brake, and is easy to install and disassemble.

[0019] The permanent magnet assembly located in the rotor assembly interacts with the stator coil to generate electromagnetic thrust when the stator coil is energized, that is, the magnetic fields of the permanent magnet assembly located in the rotor assembly and the stator assembly interact to generate electromagnetic thrust, thereby driving the rotor assembly to rotate along the axial or circumferential direction of the motor under the action of the magnetic field generated by the stator assembly; at the same time, the permanent magnet assembly acts as a magnetic field source in the passive mode when the coil is powered off, so that the stator coil induces current, and the first eddy current conductor generates an eddy current, thereby generating a braking force.

[0020] In the passive mode under the action of external load, the first eddy current conductor induces electromotive force together with the stator coil, thereby generating current, and the current generates resistance to dissipate the electromagnetic thrust generated by the permanent magnet assembly and the stator coil; at the same time, the first eddy current conductor cooperates with the permanent magnet assembly to generate eddy current damping braking force, realizing the braking function of restoring the rotor assembly to the target position or stopping. At the same time, the first eddy current conductor can effectively dissipate heat, reduce the risk of overheating, and extend the life of the motor.

[0021] At the same time, the first magnetic conductive back plate can effectively guide and concentrate magnetic flux, reduce the magnetic resistance and leakage of the magnetic circuit, and the first magnetic conductive back plate, the permanent magnet assembly and the first eddy current conductor together form a closed magnetic circuit, thereby optimizing the magnetic field distribution and enhancing the magnetic flux density in the first eddy current conductor area, that is, the first magnetic conductive back plate enhances the magnetic flux density by improving the concentration of magnetic flux and reducing the magnetic resistance of the magnetic circuit. The increase in magnetic flux density makes the eddy current generation more significant, thereby greatly enhancing the energy consumption capacity of the first eddy current conductor and greatly improving the braking performance of the motor. At the same time, the first magnetic conductive back plate can play a role in supporting components and ensure the stability of the motor under high load conditions.

[0022] At the same time, the combined superposition of the first eddy current conductor and the first magnetic conductive back plate makes the induction effect of the first eddy current conductor more significant, thereby further improving the braking effect and response speed; and can optimize the electromagnetic performance of the motor and reduce energy loss, and has better efficiency and performance than the stator yoke in the prior art.

[0023] At the same time, the first brake module is arranged in each installation groove of the stator core, which makes the first brake module arranged along the axial direction of the stator core, so that the braking force it provides is uniform, stable and reliable, effectively avoiding the problem of poor stability of the motor under strong impact loads.

[0024] It can be seen that the present invention can simultaneously realize the dual functions of driving and braking buffering on the basis of the original motor size, that is, the motor can be used in the driving mode when the stator coil 12 is energized, and can also effectively increase the braking force of the motor in the passive mode under power failure or external impact load. At this time, the motor can still provide sufficient braking force through passive energy consumption under high load conditions or even in emergency situations where the circuit is interrupted. Especially for high-speed, high-load and high-precision control equipment, it greatly enhances the motor's braking force, ensures stable and reliable operation of the equipment, and greatly reduces safety hazards.

[0025] Furthermore, the present invention is provided with a second brake module, which is arranged correspondingly to the position of the rotor assembly where the braking force needs to be enhanced; the second brake module is arranged in parallel with the stator core, and the second brake module is connected to the end face of the stator core, and the second brake module includes a second eddy current conductor and a second magnetic conductive back plate, and the second magnetic conductive back plate is sleeved outside the second eddy current conductor. At this time, compared with the first brake module, the second brake module is not affected by the electromagnetic thrust generated by the stator coil, so that the eddy current damping force generated by the position where the second brake module is set in the rotor assembly is greatly improved, thereby significantly enhancing the braking force at this position, and the combination of the first brake module and the second brake module greatly improves the motor braking capacity and effectively meets the different braking force requirements of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0027] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0028] Figure 2 yes Figure 1 AA cross-sectional view;

[0029] Figure 3 is a position relationship diagram of the stator core and the first brake module of the present invention;

[0030] Figure 4 It is a schematic diagram of the structure of the present invention with a second brake module added (initial braking force enhancement condition);

[0031] Figure 5 It is another structural schematic diagram of the present invention with a second brake module added (later-range braking force enhancement working condition);

[0032] Figure 6 It is another structural schematic diagram of the present invention in which a second brake module is added (mid-range braking force enhancement working condition);

[0033] Figure 7 is a schematic structural diagram of Embodiment 2 of the present invention;

[0034] Figure 8 yes Figure 7 A cross-sectional view of BB;

[0035] Fig. 9 is a partial schematic diagram of Embodiment 2 of the present invention;

[0036] Fig.10 is a schematic diagram of the test effect after using the first brake module of embodiment 1 of the present invention;

[0037] Fig.11 is another schematic diagram of the test effect after using the first brake module of embodiment 1 of the present invention;

[0038] Fig.12 It is a schematic diagram of the test effect under the initial braking force enhancement working condition of the present invention;

[0039] Fig.13 It is a schematic diagram of the test effect under the working condition of rear-end braking force enhancement using the present invention;

[0040] Fig.14 It is a schematic diagram of the test effect under the mid-range braking force enhancement working condition of the present invention.

[0041] The symbols in the figure represent:

[0042] 1. stator assembly; 11. stator core; 111. mounting slot; 12. stator coil; 2. rotor assembly; 21. support shaft; 3. first brake module; 31. eddy current conductor assembly; 311. first eddy current conductor; 312. first magnetic conductive back plate; 313. magnetic conductive area; 314. magnetic insulator; 32. permanent magnet assembly; 321. permanent magnet; 322. annular sleeve; 323. fastener; 4. second brake module; 41. second eddy current conductor; 42. second magnetic conductive back plate; 5. magnetic conductive soft iron; 6. guard iron. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereby.

[0044] Embodiment 1

[0045] Figures 1 to 3An embodiment of a motor with a braking function of the present invention is shown, the motor comprises a stator assembly 1 and a rotor assembly 2, the stator assembly 1 comprises a stator core 11, a stator coil 12 and a first brake module 3. The stator core 11 is provided with a plurality of mounting grooves 111 arranged along the axial direction of the stator core 11, the stator coil 12 is arranged in each mounting groove 111, the stator coil 12 is used to generate a magnetic field source, and the stator core 11 is used to conduct a magnetic circuit. In this embodiment, the first brake module 3 includes an eddy current conductor assembly 31 and a permanent magnet assembly 32. The first brake module 3 is arranged in each mounting groove 111 of the stator core 11. The eddy current conductor assembly 31 includes a first eddy current conductor 311 and a first magnetic conductive back plate 312. The first eddy current conductor 311 is arranged at the open end of the mounting groove 111, and the first magnetic conductive back plate 312 is located in the magnetic conductive area 313 between the first eddy current conductor 311 and the stator coil 12; the permanent magnet assembly 32 is sleeved outside the rotor assembly 2, and the permanent magnet assembly 32 is arranged relative to the first eddy current conductor 311 at the corresponding position. The first brake module 3 of the present invention is arranged in the mounting groove 111 of the stator core 11, and its overall layout is compact and the structure is simple. It does not need to occupy extra space of the motor, which greatly reduces the complexity of the motor when it is used as both a drive device and a brake, and is easy to install and disassemble.

[0046] In this embodiment, the permanent magnet component 32 located in the rotor assembly 2 interacts with the stator coil 12 to generate electromagnetic thrust when the stator coil 12 is energized, that is, the permanent magnet component 32 located in the rotor assembly 2 and the magnetic field of the stator assembly 1 interact to generate electromagnetic thrust, thereby driving the rotor assembly 2 to rotate along the axial or circumferential direction of the motor under the action of the magnetic field generated by the stator assembly 1; at the same time, the permanent magnet component 32 acts as a magnetic field source in the passive mode when the coil is powered off, so that the stator coil 12 induces current, and the first eddy current conductor 311 generates an eddy current, thereby generating a braking force.

[0047] In the passive mode under the action of external load, the first eddy current conductor 311 induces electromotive force together with the stator coil 12, thereby generating current, and the current generates resistance to dissipate the electromagnetic thrust generated by the permanent magnet assembly 32 and the stator coil 12; at the same time, the first eddy current conductor 311 cooperates with the permanent magnet assembly 32 to generate eddy current damping braking force, realizing the braking function of the rotor assembly 2 returning to the target position or stopping. At the same time, the first eddy current conductor 311 can effectively dissipate heat, reduce the risk of overheating, and extend the life of the motor. In this embodiment, the first eddy current conductor 311 is usually made of a non-ferromagnetic material with high electrical conductivity (such as copper, aluminum, copper alloy or aluminum alloy, etc.) to increase the intensity of the eddy current in the first eddy current conductor 311.

[0048] In this embodiment, the first magnetic conductive back plate 312 is made of a high magnetic permeability material. The first magnetic conductive back plate 312 can effectively guide and concentrate magnetic flux, reduce the magnetic resistance and leakage of the magnetic circuit, and the first magnetic conductive back plate 312, the permanent magnet assembly 32 and the first eddy current conductor 311 together form a closed magnetic circuit, thereby optimizing the magnetic field distribution and enhancing the magnetic flux density in the area of ​​the first eddy current conductor 311, that is, the first magnetic conductive back plate 312 enhances the magnetic flux density by improving the concentration of magnetic flux and reducing the magnetic resistance of the magnetic circuit. The increase in magnetic flux density makes the eddy current generation more significant, thereby greatly enhancing the energy consumption capacity of the first eddy current conductor 311, and greatly improving the motor braking performance. At the same time, the first magnetic conductive back plate 312 can play a role in supporting components to ensure the stability of the motor under high load conditions.

[0049] At the same time, the combined superposition of the first eddy current conductor 311 and the first magnetic conductive back plate 312 makes the induction effect of the first eddy current conductor 311 more significant, thereby further improving the braking effect and response speed; and can optimize the electromagnetic performance of the motor and reduce energy loss, and has better efficiency and performance than the stator yoke in the prior art.

[0050] At the same time, the first brake module 3 is arranged in each installation groove 111 of the stator core 11, so that the first brake module 3 is arranged along the axial direction of the stator core 11, so that the braking force it provides is uniform, stable and reliable, and the problem of poor stability of the motor under strong impact loads is effectively avoided.

[0051] It can be seen that the present invention can simultaneously realize the dual functions of driving and braking buffering on the basis of the original motor size, that is, the motor can be used in the driving mode when the stator coil 12 is energized, and can also effectively increase the braking force of the motor in the passive mode under power failure or external impact load. At this time, the motor can still provide sufficient braking force through passive energy consumption under high load conditions or even in emergency situations where the circuit is interrupted. Especially for high-speed, high-load and high-precision control equipment, it greatly enhances the motor's braking force, ensures stable and reliable operation of the equipment, and greatly reduces safety hazards.

[0052] like Fig.10 and Fig.11 The figure shows the comparison of the test results of the linear motor with the first brake module 3 of this embodiment and the existing linear motor without enhanced braking function under the passive mode of external impact load. Fig.10 It can be seen that the linear motor with the first braking module 3 has a greater braking distance than the linear motor without enhanced function at the same braking distance ( Fig.10 The horizontal axis represents the braking distance of the linear motor) when the braking force is significantly improved; Fig.11 It can be seen that the linear motor with the first brake module 3 has a higher rotor speed than the linear motor without enhanced function at the same rotor movement speed (( Fig.11The horizontal axis represents the rotor movement speed) when the braking force is significantly improved. It can be seen that the braking force of the linear motor with the first braking module 3 is significantly improved when the same external load is applied compared to the linear motor without enhanced braking function. At the same time, Fig.10 As shown, the braking distance of the linear motor with the first braking module 3 is significantly shorter than that of the linear motor without enhanced function, indicating that the braking performance of the linear motor under impact load is significantly improved compared with the existing motor, and it pioneered the integration of the driving and braking buffer functions of the motor based on the existing structure and space.

[0053] Further, if Figure 3 As shown, the eddy current conductor assembly 31 also includes two magnetic insulators 314, which are located in the magnetic conductive area 313. The two magnetic insulators 314 are arranged on both sides of the first magnetic conductive back plate 312 along the axial direction of the stator core 11 to effectively separate the first magnetic conductive back plate 312 and the stator core 11, so that the magnetic flux lines can pass through the first magnetic conductive back plate 312, thereby enhancing the magnetic field strength at the first eddy current conductor 311 and further improving the braking effect; at the same time, the magnetic insulator 314 isolates the heat between the stator coil 12 and the first eddy current conductor 311, so that the heat is dissipated through the first magnetic conductive back plate 312, thereby improving the heat dissipation efficiency.

[0054] Preferably, the motor with a braking function also includes a second brake module 4 that enhances the braking force according to the braking force requirements of different positions of the motor. The second brake module 4 is correspondingly arranged at the position of the rotor assembly 2 where the braking force needs to be enhanced, and the second brake module 4 is arranged in parallel with the stator core 11, and the second brake module 4 is connected to the end face of the stator core 11. The second brake module 4 includes a second eddy current conductor 41 and a second magnetic conductive back plate 42, and the second magnetic conductive back plate 42 is sleeved outside the second eddy current conductor 41. Compared with the first brake module 3, the second brake module 4 of the present invention is not affected by the electromagnetic thrust generated by the stator coil 12, so that the eddy current damping force generated by the position where the second brake module 4 is set in the rotor assembly 2 is greatly improved, thereby significantly enhancing the braking force of the motor at the position where the second brake module 4 is set. The combination of the first brake module 3 and the second brake module 4 greatly improves the braking capacity of the motor and effectively meets the different braking force requirements of the motor. In this embodiment, the setting length of the second brake module 4 can be set according to the motor braking force requirements, and is not limited here.

[0055] In this embodiment, the motor is a linear motor. Further, the permanent magnet component 32 is located at the end of the rotor component 2 close to the rotor external connection member when the motor is in the initial working state, and the braking distance of the motor is the sum of the axial length of the permanent magnet component 32 and the axial movement distance of the permanent magnet component 32, such as Figure 1The permanent magnet assembly 32 is disposed at the end of the rotor assembly 2 close to the rotor external connection member, so that the rotor assembly 2 has a sufficient braking distance when the impact load moves axially, thereby further improving the braking effect.

[0056] This embodiment provides three linear motors that are suitable for different braking force requirements and enhance the braking function. The permanent magnet assembly 32 generates eddy current braking force when it moves axially to be arranged opposite to the second braking module 4. Specifically:

[0057] like Figure 4 As shown, when the motor has a need for enhanced initial braking force, the second brake module 4 is connected to one end of the stator core 11 close to the rotor external connector. In the passive mode under the action of external impact load, the permanent magnet assembly 32 and the support shaft 21 will produce axial movement under the impact load. At this time, the permanent magnet 321 of the permanent magnet assembly 32 arranged close to the outside of the rotor and the second brake module 4 produce relative movement, and the second eddy current conductor 41 cooperates with the permanent magnet 321 to generate eddy current damping force, so that the motor has sufficient braking force in the initial stage ( Figure 4 The permanent magnet assembly 32 is at the maximum braking position, that is, the maximum braking distance of the motor), the movement of the rotor assembly 2 can be effectively buffered in the initial stage, and the initial braking force requirement of the motor can be achieved. Fig.12 As shown, the second brake module 4 is set so that the braking force of the first 400 mm travel section of the motor braking distance is significantly higher than Fig.10 The braking force of the first 400 mm stroke section of the first brake module 3 is set. It can be seen that the setting and setting position of the second brake module 4 of the present invention significantly enhance the initial braking force of the linear motor in the passive mode of external impact load.

[0058] like Figure 5 As shown, when the motor has a need for enhanced braking force in the rear stroke, the second brake module 4 is connected to the end of the stator core 11 away from the external connection of the rotor. In the passive mode under the action of external impact load, the permanent magnet assembly 32 and the support shaft 21 will produce axial movement under the impact load. At this time, when the permanent magnet assembly 32 moves to the position of the second brake module 4 (i.e., in the rear stroke of the motor), the permanent magnet 321 and the second brake module 4 produce relative movement, and the second eddy current conductor 41 cooperates with the permanent magnet 321 to generate eddy current damping force, so that the motor has sufficient braking force in the rear stroke ( Figure 5 The permanent magnet assembly 32 is at the maximum braking position, that is, the maximum braking distance of the motor), the movement of the rotor assembly 2 can be significantly buffered in the later stage, so as to meet the later braking force requirement of the motor. Fig.13 As shown, the braking force in the second half of the motor braking distance of 600-1000mm is significantly higher than Fig.10 The braking force of the first brake module 3 is set, and Fig.13 Braking force in the range of 600-850mm Fig.10 There is an increasing trend, and Fig.10 The braking force drops rapidly in the second half of the 600 mm stroke. It can be seen that the arrangement and the arrangement position of the second braking module 4 of the present invention significantly enhance the braking force of the linear motor in the passive mode of the external impact load.

[0059] like Figure 6 As shown, when the motor has a need for enhanced mid-range braking force, the stator core 11 is split into two sections, and the second brake module 4 is disposed between adjacent sections of the stator core 11. In the passive mode under the action of external impact loads, the permanent magnet assembly 32 and the support shaft 21 will generate axial movement under the impact load. At this time, when the permanent magnet assembly 32 moves to the position of the second brake module 4 (i.e., when the motor is in the mid-range), the permanent magnet 321 and the second brake module 4 generate relative movement, and the second eddy current conductor 41 cooperates with the permanent magnet 321 to generate eddy current damping force, so that the motor has sufficient braking force in the mid-range ( Figure 6 The permanent magnet assembly 32 is at the maximum braking position, that is, the maximum braking distance of the motor), the movement of the rotor assembly 2 can be significantly buffered in the mid-range, achieving the mid-range braking force requirement of the motor. Fig.14 As shown in the figure, within the braking distance range of 200-800mm, the braking force can stably output a braking force of about 400kN. Fig.10 The mid-range braking has a significant downward trend, and the 600-800mm section is significantly lower than 400kN. It can be seen that the arrangement and position of the second brake module 4 of the present invention significantly enhance the mid-range braking force of the linear motor in the passive mode of the external impact load. In other embodiments, the number of sections of the stator core 11 can be adjusted according to the mid-range braking force requirements of the motor, such as three sections, four sections, etc.

[0060] Furthermore, the length of the first eddy current conductor 311 is greater than the length of the first magnetic conductive back plate 312, and the first magnetic conductive back plate 312 is arranged in the middle part of the first eddy current conductor 311 along the axial direction of the stator core 11, so as to facilitate the arrangement of magnetic insulators 314 on both axial sides of the stator core 11, thereby further effectively separating the first magnetic conductive back plate 312 and the stator core 11, so that the magnetic flux lines can pass through the first magnetic conductive back plate 312, thereby enhancing the magnetic field strength at the first eddy current conductor 311 and achieving a better braking effect; at the same time, the space size of the magnetic insulator 314 arranged on both axial sides of the stator core 11 is made the same, thereby effectively ensuring the thermal insulation effect between the stator coil 12 and the first eddy current conductor 311, and further improving the heat dissipation efficiency.

[0061] The length of the second eddy current conductor 41 is equal to the length of the second magnetic conductive back plate 42, and the second eddy current conductor 41 is arranged in an overlapping manner with the second magnetic conductive back plate 42. The overlapping arrangement further optimizes the electromagnetic performance of the motor, reduces energy loss, and has a simple arrangement structure, ensuring that the motor has an excellent braking effect.

[0062] Preferably, if Figure 3 As shown, one end of the first magnetic conductive back plate 312 along the radial direction of the stator assembly 1 is connected to the first eddy current conductor 311, and the other end of the first magnetic conductive back plate 312 is in contact with the stator coil 12. The first magnetic conductive back plate 312 transfers the heat generated by the stator coil 12 or the first eddy current conductor 311 to the stator core 11 and the air gap between the permanent magnet assembly 32 and the first eddy current conductor 311, and finally dissipates in the air, which greatly improves the heat transfer efficiency and the heat dissipation effect of the motor, and realizes reliable and safe operation of the motor.

[0063] In this embodiment, the rotor assembly 2 includes a support shaft 21. The permanent magnet assembly 32 includes a plurality of permanent magnets 321, which are arranged axially and / or radially along the support shaft 21, and the permanent magnet assembly 32 is coaxially arranged with the support shaft 21. The permanent magnet assembly 32 adopts a Halbach array, an axial magnetization and / or a radial magnetization magnetic group. The thickness, length and total length of the radial and axial magnetic poles in the permanent magnet assembly 32 can be adjusted according to the selected magnetic pole array and the required braking force.

[0064] like Figure 1 and Figure 2 As shown, the permanent magnet assembly 32 also includes an annular sleeve 322 with an annular groove, and each permanent magnet 321 is placed in the annular groove, so as to facilitate the assembly of multiple permanent magnets 321 as an integral permanent magnet component in a linear motor with a longer axial length, and to protect the permanent magnet 321. The annular sleeve 322 is a non-magnetic sleeve (such as a stainless steel sleeve, etc.), so that the permanent magnet 321 does not produce mutual magnetic attraction when placed in the annular sleeve 322, which facilitates the effective installation of the permanent magnet 321; the thickness of the non-magnetic sleeve is usually set to 1~3mm, which will not affect the magnetic field, so as to facilitate the installation and maintenance of the permanent magnet assembly 32 while not affecting the generation of the motor driving force. At the same time, the annular sleeve 322 is installed on the support shaft 21 through the fastener 323 at the end of the annular sleeve 322 to reliably fix the permanent magnet assembly 32. In this embodiment, the fastener 323 can be set as a magnetic nut.

[0065] In this embodiment, the number of slots of the mounting slot 111 is paired with the magnetic poles of the permanent magnet 321, and the pairing of the mounting slot 111 and the permanent magnet 321 is set to two slots corresponding to one level, that is, the number of slots of the mounting slot 111 is 48 slots, and the magnetic poles of the permanent magnet 321 are 24 poles. In other embodiments, the number of slots of the mounting slot 111 and the pairing of the magnetic poles of the permanent magnet 321 can be adjusted according to the actual performance requirements of the motor, and are not limited here. For example, it can also be set to one slot corresponding to one level or three slots corresponding to one level. The stator coil 12 can adopt a three-phase uniform coil winding.

[0066] The structure of the existing motor is usually an asymmetric structure, which is complex and has high manufacturing cost, and the stability of the motor under strong impact load is poor. The motor of this embodiment adopts a tubular concentric structure, that is, the stator assembly 1 and the rotor assembly 2 are both arranged in a tubular concentric manner, and the mounting groove 111 is an annular mounting groove. The structure is simple and compact, and the installation is convenient. The stability of the motor under load is strong. Furthermore, the outer diameter of the linear motor of this embodiment is large, and the support shaft 21 of the present invention adopts a hollow support shaft 21, which can improve the magnetic field strength while reducing the weight of the motor.

[0067] The motor with braking function in this embodiment realizes the dual functions of driving and braking buffering, and its working process is as follows:

[0068] When the motor is in driving mode, three-phase alternating current is passed into the stator coil 12, and a moving magnetic field moving along the axial direction of the motor is generated in the stator component 1. The rotor component 2 is located in the magnetic field of the stator component 1. Since the permanent magnet 321 provides a constant magnetic field, the moving magnetic field interacts with the constant magnetic field to generate an electromagnetic thrust. The electromagnetic thrust acts on the rotor component 2, causing the rotor component 2 to move in a straight line in the same direction as the moving magnetic field, thereby realizing the motor driving function; at this time, the first eddy current conductor 311 will generate an eddy current damping force in the opposite direction of the driving force, but its force is very small and can be ignored.

[0069] When the motor is in a passive mode with a braking demand, as the motor speed decreases, the eddy current reaction force generated by the cooperation of the first eddy current conductor 311 and the permanent magnet assembly 32 can achieve a buffering and braking effect, that is, the eddy current forms an induced current in the first eddy current conductor 311 and generates a braking force opposite to the movement direction of the rotor assembly 2 to achieve a smooth deceleration of the motor; when a second braking module 4 is further provided, the permanent magnet assembly 32 will also generate an eddy current braking force when the rotor assembly 2 moves axially to be arranged relative to the second braking module 4, so as to further improve the motor braking ability. Specifically:

[0070] In the passive mode under the action of external impact load, the motor acts as a braking buffer device, and the rotor assembly 2 composed of the permanent magnet assembly 32 and the support shaft 21 will produce axial movement under the impact load. According to Faraday's law of electromagnetic induction, the first eddy current conductor 311 of the stator assembly 1 and the stator coil 12 induce an electromotive force, thereby generating current; according to Lenz's law, the current generates resistance, which will generate an electromagnetic braking force in the opposite direction of the electromagnetic thrust. While the stator coil 12 induces current to dissipate energy, the first eddy current conductor 311 cooperates with the permanent magnet 321 to generate eddy current damping force, and the kinetic energy of the rotor assembly 2 is converted into electrical energy through electromagnetic action and dissipated in the form of heat energy, so that the movement of the rotor assembly 2 is gradually buffered and restored to the target position or finally stopped.

[0071] In the passive mode when the stator coil 12 is powered off, the motor acts as a braking buffer device, and the permanent magnet 321 acts as a magnetic field source when the stator coil 12 is powered off, so that the stator coil 12 induces current, and the first eddy current conductor 311 interacts with the permanent magnet 321 to generate eddy current, thereby generating a braking force. It can be seen that the present invention can realize the function conversion of driving and braking in the same structure through the arrangement of the first eddy current conductor 311 and the first magnetic conductive back plate 312, so that the braking effect of the motor is greatly improved.

[0072] Embodiment 2

[0073] Figures 7 to 9 Another embodiment of a motor with a braking function of the present invention is shown. This embodiment is basically the same as the previous embodiment, except that the motor of this embodiment is a rotating motor with a compact structure and a short axial length. The permanent magnet assembly 32 of this embodiment is connected to the support shaft 21 along the radial inner side of the motor through a magnetic soft iron 5 to support the permanent magnet 321, and plays a role in concentrating magnetic flux and enhancing the magnetic field, reducing magnetic flux loss, and improving the efficiency of the motor.

[0074] The permanent magnet assembly 32 is provided with a guard iron 6 along the radial outer side of the motor. The guard iron 6 provides a low magnetic resistance path for the magnetic flux of the motor, thereby effectively guiding and concentrating the magnetic field, guiding the magnetic field from the stator coil 12 to the rotor assembly 2, and forming a strong magnetic field through the air gap closed magnetic circuit to drive the rotor assembly 2 to rotate, which plays a role in protecting the motor and preventing the motor from being damaged by the external environment. The guard iron 6 can play a supporting role during the operation of the motor, and can effectively disperse and withstand the vibration generated when the motor is running, avoid damage to the permanent magnet 321, and ensure stable operation of the motor. In addition, the guard iron 6 can effectively dissipate the heat generated by the permanent magnet 321, enhance the heat dissipation performance of the motor, and extend the service life of the motor. It can be seen that the form of providing the magnetic soft iron 5 and the guard iron 6 on the inner and outer sides of the permanent magnet 321 of the present invention can effectively support and protect the permanent magnet.

[0075] When the motor is in the driving mode, the stator coil 12 is energized, and a moving magnetic field rotating along the circumference of the motor is generated in the stator assembly 1. The rotor assembly 2 is located in the magnetic field of the stator assembly 1. Since the permanent magnet 321 provides a constant magnetic field, the moving magnetic field interacts with the constant magnetic field to generate an electromagnetic thrust, which acts on the rotor assembly 2, causing the rotor assembly 2 to rotate in the same direction as the moving magnetic field, thereby realizing the motor driving function. When braking is required, as described in the above embodiment 1, the stator coil 12 and the first eddy current conductor 311 generate induced current and eddy current, and the motor's braking system converts mechanical energy into heat energy or electrical energy to slow down or stop the rotation of the rotor assembly 2.

[0076] Furthermore, when a second brake module 4 with an additional braking function is provided, a permanent magnet component 32 is provided at a position of the rotor component 2 corresponding to the second brake module 4, so that the rotating motor generates sufficient eddy current braking force to meet the high braking requirements of the rotating motor.

[0077] Furthermore, the support shaft 21 is a steel support shaft, which plays a role of magnetic conductivity, and provides a low magnetic resistance path for the permanent magnet assembly 32, helps to concentrate and guide the magnetic field, and prevents the magnetic flux from leaking from the back of the permanent magnet assembly 32, thereby enhancing the strength of the main magnetic field; at the same time, the support shaft 21 fixes and supports the permanent magnet assembly 32, ensuring that the permanent magnet assembly 32 remains stable during the operation of the motor, and avoids displacement or falling off due to vibration or impact. In this embodiment, the rotating motor has a small diameter. In order to make the motor structure more compact, the support shaft 21 is set as a solid support shaft, so that it has excellent bearing capacity in a compact space.

[0078] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A motor with a braking function, comprising a stator assembly and a rotor assembly, wherein the stator assembly comprises a stator core with a mounting slot and a stator coil arranged in the mounting slot, characterized in that: It also includes a first braking module, which includes an eddy current conductor assembly arranged in each of the mounting slots, and a permanent magnet assembly sleeved outside the rotor assembly, the eddy current conductor assembly includes a first eddy current conductor and a first magnetic conductive back plate, the first eddy current conductor is arranged at the open end of the mounting slot, and the first magnetic conductive back plate is located in the magnetic conductive area between the first eddy current conductor and the stator coil; the permanent magnet assembly is arranged opposite to the first eddy current conductor at the corresponding position; one end of the first magnetic conductive back plate along the radial direction of the stator assembly is connected to the first eddy current conductor, and the other end of the first magnetic conductive back plate is in contact with the stator coil.

2. The motor with braking function according to claim 1, characterized in that: The eddy current conductor assembly further includes two magnetic insulators, which are located in the magnetic conductive area and are disposed on both sides of the magnetic conductive back plate along the axial direction of the stator core to separate the magnetic conductive back plate from the stator core.

3. The motor with braking function according to claim 1, characterized in that: It also includes a second brake module for enhancing the braking force according to the braking force requirements at different positions of the motor, and the second brake module is correspondingly arranged at the position of the rotor assembly where the braking force needs to be enhanced; the second brake module is arranged in parallel with the stator core and connected to the end face of the stator core; the second brake module includes a second eddy current conductor and a second magnetic back plate, and the second magnetic back plate is sleeved on the outside of the second eddy current conductor.

4. The motor with braking function according to claim 3, characterized in that: When the motor is a rotating motor, the permanent magnet assembly is provided at a position of the rotor assembly corresponding to the second brake module; When the motor is a linear motor, the permanent magnet assembly is located at the end of the rotor assembly close to the rotor external connection member in the initial working state of the motor, and the braking distance of the motor is the axial movement distance of the permanent magnet assembly.

5. The motor with braking function according to claim 3, characterized in that: When the motor has a demand for enhanced initial-range braking force, the second brake module is connected to an end of the stator core close to the rotor external connector; when the motor has a demand for enhanced rear-range braking force, the second brake module is connected to an end of the stator core away from the rotor external connector; when the motor has a demand for enhanced mid-range braking force, the stator core is split into at least two sections, and the second brake module is arranged between adjacent sections of the stator core.

6. The motor with braking function according to claim 3, characterized in that: The length of the first eddy current conductor is greater than that of the first magnetic conductive back plate, and the first magnetic conductive back plate is arranged in the middle of the first eddy current conductor along the axial direction of the stator core; the length of the second eddy current conductor is equal to that of the second magnetic conductive back plate, and the two are arranged overlappingly.

7. The motor with braking function according to any one of claims 1 to 6, characterized in that: The rotor assembly includes a support shaft; the permanent magnet assembly is arranged coaxially with the support shaft, and the permanent magnet assembly includes a plurality of permanent magnets arranged axially and / or radially along the support shaft, and an annular sleeve with an annular groove, each of the permanent magnets is placed in the annular groove and is mounted on the support shaft through a fastener at the end of the annular sleeve.

8. The motor with braking function according to claim 7, characterized in that: When the motor is a linear motor, the annular sleeve is a non-magnetic sleeve.

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