CN108663148B - Chassis dynamometer driven by permanent magnet synchronous motor - Google Patents
Chassis dynamometer driven by permanent magnet synchronous motor Download PDFInfo
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- CN108663148B CN108663148B CN201810735369.5A CN201810735369A CN108663148B CN 108663148 B CN108663148 B CN 108663148B CN 201810735369 A CN201810735369 A CN 201810735369A CN 108663148 B CN108663148 B CN 108663148B
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 47
- 230000017525 heat dissipation Effects 0.000 claims abstract description 20
- 238000003825 pressing Methods 0.000 claims description 39
- 230000001681 protective effect Effects 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 230000006698 induction Effects 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 7
- 230000001939 inductive effect Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 13
- 238000012360 testing method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 12
- 230000009286 beneficial effect Effects 0.000 description 8
- 238000004088 simulation Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
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- 230000000630 rising effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
- G01L3/242—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity by measuring and simultaneously multiplying torque and velocity
Abstract
The invention discloses a chassis dynamometer driven by a permanent magnet synchronous motor, which comprises a base, a main shaft, an encoder, a torque measurer and a hub, wherein the main shaft is fixedly arranged on the base through a bearing; the hub is fixed on the main shaft, the main shaft is provided with resistance by a permanent magnet synchronous motor, and the permanent magnet synchronous motor comprises a rotating shaft, a shell, a stator assembly and a rotor assembly; the stator assembly is fixedly arranged on the shell and provides a rotating resistance magnetic field for the rotor assembly; the rotor component with permanent magnetic property is fixedly arranged on the rotating shaft and corresponds to the stator component; the torque measurer is arranged between the main shaft and the rotating shaft and is used for measuring the rotating torque between the shafts; the encoder is used for measuring the rotating speed and the rotating angle of the rotating shaft. The invention aims to provide the chassis dynamometer which has the advantages of simple structure, low processing difficulty, high control precision, reliable detection data, good heat dissipation performance and adaptability to extreme environments in environmental bins.
Description
Technical Field
The invention relates to the technical field of automobile detection equipment, in particular to a chassis dynamometer driven by a permanent magnet synchronous motor.
Background
The chassis dynamometer is indoor bench test equipment for testing the performances of automobile dynamic performance, multi-working-condition emission indexes, fuel indexes and the like, the automobile chassis dynamometer simulates a road surface through a roller, calculates a road simulation equation, simulates by a loading device, realizes accurate simulation of various working conditions of the automobile, can be used for loading and debugging the automobile, and diagnoses faults of the automobile under the loading condition; the comprehensive measuring system is formed by the comprehensive measuring system, the five-gas analyzer, the transmission smoke meter, the engine tachometer and the computer automatic control system, so that the automobile exhaust emission under different working conditions can be measured, the chassis dynamometer is convenient to use, and the performance is reliable and is not influenced by external conditions. On the premise of not disassembling the automobile, the service performance of each system and each component of the automobile can be accurately and rapidly detected. The chassis dynamometer can be used for automobile science experiments and also can be used for maintenance and detection.
The current motor type chassis dynamometer has two basic structures: the device is formed by coaxially connecting three parts of a dynamometer, a rotary drum and a variable combined flywheel set, wherein the dynamometer provides resistance to a driving wheel of a vehicle through the rotary drum, absorbs mechanical work generated by running of the wheels, and simultaneously measures the rotating speed of the rotary drum and torque acting on the rotary drum. In the detection work, the inertia of the flywheel group including the inertia of the motor and the rotary drum provides the inertia force during variable speed operation, and different flywheel combinations are used for adapting to vehicle types with different inertia. The other structure is to remove the flywheel group, and replace the mechanical inertia of the flywheel group by using equivalent electric simulation inertia generated by the dynamometer to replace the inertia force of the mechanical flywheel group. And with the continuous deep detection, the vehicle test is more and more refined, and the data precision requirement is higher, so that the test of most chassis dynamometers needs to be carried out in an environment bin, the environment bin can realize reliable experimental environments such as an automobile cold start test, an automobile high and low temperature test, a frost and fog simulation test, an in-automobile harmful gas simulation test, a whole vehicle emission test and the like, and provides product inspection and development service of new products for vehicle factories, and the construction specification of the environment bin generally has higher requirements in terms of temperature control: 1. the temperature test range is-45-65 ℃ and the control precision is +/-1 ℃; 2. the cooling rate is that the temperature in the cabin is reduced from +25 ℃ to-45 ℃ within 360 minutes of no-load; 3. the temperature rising speed is that the temperature in the cabin rises from +25 ℃ to 65 ℃ within 60 minutes of no-load; 4. performing a cold start test at a low temperature, and controlling no temperature after starting; 5. simulating high temperature environment at 35-65 deg.c and 60-60% RH. In the process of detecting the dynamometer, in order to better protect equipment, the dynamometer and an environment bin can be isolated when the dynamometer is not required to work, and after the temperature of the environment bin is adjusted, the dynamometer is moved into the environment bin to test a vehicle.
Disclosure of Invention
The invention aims to provide the chassis dynamometer which has the advantages of simple structure, low processing difficulty, high control precision, reliable detection data, good heat dissipation performance and adaptability to extreme environments in environmental bins.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the chassis dynamometer driven by the permanent magnet synchronous motor comprises a base, a main shaft, an encoder, a torque measurer and a hub, wherein the main shaft is fixedly arranged on the base through a bearing; the hub is fixed on the main shaft, the main shaft is provided with resistance by a permanent magnet synchronous motor, and the permanent magnet synchronous motor comprises a rotating shaft, a shell, a stator assembly and a rotor assembly; the stator assembly is fixedly arranged on the shell and provides a rotating resistance magnetic field for the rotor assembly; the rotor component with permanent magnetic property is fixedly arranged on the rotating shaft and corresponds to the stator component; the torque measurer is arranged between the main shaft and the rotating shaft and is used for measuring the rotating torque between the shafts; the encoder is used for measuring the rotating speed and the rotating angle of the rotating shaft.
Preferably, the shell comprises a cylindrical cavity, a front pressing plate and a rear pressing plate, wherein the front pressing plate and the rear pressing plate are detachably connected to two ends of the cylindrical cavity, and the rotating shaft is arranged in the front pressing plate and the rear pressing plate through bearings; the beneficial effects are that: the shell is divided into three parts, so that the integral processing difficulty is reduced, the assembly is convenient, the replacement is convenient, and the maintenance is convenient.
Preferably, the cylindrical cavity is provided with a first heat dissipation hole; the beneficial effects are that: the circulation of the motor and the outside air is enhanced, and the heat dissipation of the motor is facilitated.
Preferably, the front pressing plate is provided with a second heat dissipation hole; the structure of the rear pressing plate is the same as that of the front pressing plate; the beneficial effects are that: the front pressing plate and the rear pressing plate which are symmetrically arranged adopt the same design, so that the types of processing parts can be reduced, and the manufacturing cost of the parts is reduced; further, the circulation of the motor and the outside air is enhanced, and the heat dissipation of the motor is facilitated.
Preferably, the permanent magnet synchronous motor is covered by a protective cover, and the protective cover sleeved on the stator base is fixed on the base; an air inlet and an air outlet are formed in the protective cover, and a heat insulation layer is arranged on the inner wall of the protective cover; the air inlet is connected with an external cold air system; the beneficial effects are that: external dust or impurities are prevented from entering the motor, and the normal operation of the motor is prevented from being influenced; the heat insulation layer effectively isolates the temperature of the motor from the environment bin, and prevents the temperature generated in the operation process of the motor from influencing the temperature of the environment bin test; the air inlet and the air outlet are arranged to introduce an external cold air system, so that the heat dissipation speed of the motor is accelerated, the motor can be in the optimal working temperature for a long time, the reliability of equipment is enhanced, and the taken heat is directly discharged out of the environmental bin, and the influence on the temperature of the environmental bin is avoided.
Preferably, the rotating shaft is in a through hole structure; the circulation of the motor rotor assembly and the outside air is enhanced, and the heat dissipation of the motor rotor assembly is facilitated.
Preferably, the rotor assembly comprises a rotor base and a plurality of magnetic base steel plates uniformly distributed on the rotor base around the axis of the rotating shaft, and the rotor base is fixedly arranged on the rotating shaft; the beneficial effects are that: the rotor base is used for basically providing a template capable of being accurately positioned for the magnetic steel, so that the magnetic steel substrate is convenient to install, the motor rotor assembly and the main shaft can be separately machined, machining difficulty is reduced, detachable connection mode design is convenient to use, and later replacement and maintenance are convenient.
Preferably, the stator assembly comprises a stator base and a stator unit, wherein the stator base is fixedly arranged on the main shaft, and the stator unit is fixedly arranged on the stator base; the beneficial effects are that: the stator base is used for providing a positioning and mounting platform for the stator unit, and the stator unit can be provided with a groove adapted to the stator unit, so that the stator unit can be positioned conveniently, the assembly process of the device is simpler and more convenient, and the mounting quality can be guaranteed well.
Preferably, the stator unit is composed of a plurality of stator modules in a fan-shaped structure; the stator module comprises a stator iron core and a stator winding wound on the stator iron core; the method has the advantages that the modularized design breaks through the integral manufacturing process of the traditional stator core, the processing difficulty of the large-radius stator core is reduced, the principle is that the stator core is divided into a plurality of independently controllable stator modules, under the condition that the encoder accurately reads the relative positions of the rotor and the stator, each single stator module generates a specific magnetic field under the action of the controller, electromagnetic force in the same rotation direction is generated for a single magnetic base steel plate passing through the magnetic field, the electromagnetic force is combined together to form a rotating electromagnetic force, and then analog resistance or inertia quantity is provided for a hub, if the single stator module is damaged, the controller is used for allocating the single stator module, and the equipment still can run; when repairing, only a single stator module needs to be replaced, compared with a traditional motor stator, once the motor stator is damaged, the equipment immediately stops running and cannot work normally, and the whole stator needs to be replaced during repairing.
Preferably, the encoder comprises a code disc and an induction element for inducing the code disc, wherein the code disc is arranged on a rotating shaft or a rotor assembly, and the induction element is arranged on the shell or a stator assembly and corresponds to the code disc; the beneficial effects are that: the encoder of the permanent magnet synchronous motor is effectively utilized to read the rotating speed and the rotating angle of the main shaft, the utilization rate of components is improved, and the cost is saved.
Compared with the prior art, the invention has the beneficial effects that 1, the design of the protective cover and the heat insulation layer thereof not only protects the extreme environment of the environment bin from influencing the motor, but also is used for thermally isolating the motor from the environment bin, thereby preventing the heat generated by the motor during the operation from influencing the environment bin; 2. the design of the heat dissipation holes of the motor shell enhances the circulation performance between the motor and the air and improves the heat dissipation performance of the motor; 3. the motor adopts a modularized design, so that the processing difficulty of a motor stator is reduced, the production cost is saved, and particularly, when a large-radius stator assembly is produced; 4. and the application of the permanent magnet synchronous motor improves the control accuracy.
Drawings
Fig. 1 is a schematic structural diagram of a chassis dynamometer driven by a permanent magnet synchronous motor according to the first embodiment;
fig. 2 is a schematic structural diagram of a chassis dynamometer driven by a permanent magnet synchronous motor according to the first embodiment;
FIG. 3 is a schematic view of the structure of the cylindrical cavity;
FIG. 4 is a schematic view of the structure of the front platen;
FIG. 5 is a schematic structural diagram of a rotor assembly and a stator assembly according to the first embodiment;
FIG. 6 is a schematic view of the structure of the protective cover;
fig. 7 is a schematic structural diagram of a chassis dynamometer driven by a permanent magnet synchronous motor according to the second embodiment;
fig. 8 is a schematic structural diagram of a chassis dynamometer driven by a permanent magnet synchronous motor according to the second embodiment;
fig. 9 is a schematic structural view of a stator assembly according to a second embodiment;
fig. 10 is a schematic structural diagram of a chassis dynamometer driven by a permanent magnet synchronous motor according to the third embodiment;
fig. 11 is a schematic structural diagram of a chassis dynamometer driven by a permanent magnet synchronous motor according to the third embodiment;
in the figure: 1. a base; 11. a bottom plate; 12. a support column; 13. a rotating shaft; 14. a rear pressing plate; 15. a front platen; 151. a second heat radiation hole; 16. a cylindrical cavity; 161. a first heat radiation hole; 17. a primary gearbox; 2. a main shaft; 3. a bearing; 4. an encoder; 41. a code wheel; 42. an inductive element; 5. a protective cover; 51. an air inlet; 52. an air outlet; 53. a thermal insulation layer; 6. a stator assembly; 61. a stator base; 62. a stator unit; 62-1, stator module; 7. a key; 8. a rotor assembly; 81. a rotor base; 82. a magnetic steel substrate; 9. a torque measurer; 10. rotating the grain.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present invention, are within the scope of the present invention.
Example 1
As shown in fig. 1-6, a chassis dynamometer driven by a permanent magnet synchronous motor comprises a base 1, a main shaft 2, an encoder 4, a torque measurer 9 and a hub 10, wherein the base 1 comprises a bottom plate 11 and support columns 12 arranged on two sides of the bottom plate 11; the main shaft 2 is fixedly arranged between the support columns 12 through bearings 3; the hub 10 is fixed on the main shaft 2, the main shaft 2 is provided with electromagnetic resistance to simulate mechanical inertia by a permanent magnet synchronous motor, and the permanent magnet synchronous motor comprises a rotating shaft 13, a shell, a stator assembly 6 and a rotor assembly 8; the stator assembly 6 is fixedly mounted on the housing and provides a rotating resistance magnetic field for the rotor assembly 8; the rotor assembly 8 with permanent magnetic property is fixedly arranged on the rotating shaft 13 and corresponds to the stator assembly 6; the torque measurer 9 is arranged between the main shaft 2 and the rotating shaft 13 and is used for measuring the rotating torque between the shafts; the encoder 4 is used for measuring the rotation speed and rotation angle of the rotating shaft 13.
Preferably, the housing comprises a cylindrical cavity 16, a front pressing plate 15 and a rear pressing plate 14, wherein the front pressing plate 15 and the rear pressing plate 14 are detachably connected to two ends of the cylindrical cavity 16 through fastening bolts, and the rotating shaft 13 is installed in the front pressing plate and the rear pressing plate through bearings; the cylindrical cavity 16 is provided with first heat dissipation holes 161, and the first heat dissipation holes 161 are waist-shaped round holes and are uniformly distributed on the peripheral wall of the cylindrical cavity 16; the front pressing plate 15 is provided with a second heat dissipation hole 151, and the second heat dissipation hole 151 has a fan-shaped structure; the structure of the rear pressing plate 14 is the same as that of the front pressing plate 15; further, the permanent magnet synchronous motor is covered by a protective cover 5, and the protective cover 5 sleeved on the stator base 61 is fixed on the support column 12; the protective cover 5 is provided with an air inlet 51 and an air outlet 52, and the inner wall is provided with a heat insulation layer 53; the air inlet 51 is connected with an external cold air system; the rotor assembly 8 comprises a rotor base 81 and a plurality of magnetic steel substrates 82 which are uniformly distributed on the rotor base 81 around the axial lead of the main shaft 2, and the rotor base 81 is fixedly arranged on the rotating shaft 13 through a key 7; the stator assembly 6 comprises a stator base 61 and a stator unit 62, wherein the stator base 61 is fixedly arranged on the cylindrical cavity 16, and the stator unit 62 is fixedly arranged on the stator base 61; further, the stator unit 62 is composed of a plurality of stator modules 62-1 having a sector-shaped ring structure; the stator module 62-1 includes a stator core and a stator winding wound around the stator core; the stator modules 62-1 are uniformly distributed on the circumferential inner wall of the stator base 61 around the axial lead of the stator base 61; the encoder 4 comprises a code disc 41 and an induction element 42 for inducing the code disc 41, wherein the code disc 41 is arranged on the rotating shaft 13, and the induction element 42 is arranged on the cylindrical cavity 16 and corresponds to the code disc 41.
During operation, the vehicle tyre is in contact with the hub 10, the hub 10 is driven to rotate by the tyre of the vehicle after starting, at the moment, the hub 10 automatically simulates the resistance of the vehicle in the road running process by adopting the full-electric inertia simulation technology under the electromagnetic force action of the stator assembly 6 and the rotor assembly 8 of the permanent magnet synchronous motor, so that the measurement of each parameter in the vehicle running process is realized, the encoder 4 is used for detecting the rotating speed and the rotating angle of the rotating shaft 13, the rotating shaft 13 is connected with the main shaft 2 through the torque measurer 9, the torque measurer 9 is used for measuring the rotating torque value on the main shaft 2 in the shaft rotating process, the value is transmitted to the controller, and the controller is used for indirectly calculating the real-time power of the vehicle according to the rotating speed of the rotating shaft 13.
Example two
As shown in fig. 7-9, a chassis dynamometer driven by a permanent magnet synchronous motor comprises a base 1, a main shaft 2, an encoder 4, a torque measurer 9 and a hub 10, wherein the base 1 comprises a bottom plate 11 and support columns 12 arranged on two sides of the bottom plate 11; the main shaft 2 is fixedly arranged between the support columns 12 through bearings 3; the hub 10 is fixed on the main shaft 2, the main shaft 2 is provided with electromagnetic resistance to simulate mechanical inertia by a permanent magnet synchronous motor, and the permanent magnet synchronous motor comprises a rotating shaft 13, a shell, a stator assembly 6 and a rotor assembly 8; the stator assembly 6 is fixedly mounted on the housing and provides a rotating resistance magnetic field for the rotor assembly 8; the rotor assembly 8 with permanent magnetic property is fixedly arranged on the rotating shaft 13 and corresponds to the stator assembly 6; the torque measurer 9 is arranged between the main shaft 2 and the rotating shaft 13 and is used for measuring the rotating torque between the shafts; the encoder 4 is used for measuring the rotation speed and rotation angle of the rotating shaft 13.
Preferably, the torque measurer 9 has a columnar structure, is fixedly arranged on the support column 12, is provided with a mounting bolt hole of a permanent magnet synchronous motor on the end face, and is fixedly arranged on the torque measurer 9 through bolts; the rotor assembly 8 comprises a rotor base 81 and a plurality of magnetic steel substrates 82 which are uniformly distributed on the rotor base 81 around the axis of the rotating shaft 13, wherein the rotor base 81 in a disc-shaped structure is fixedly arranged on the end face of the rotating shaft 13 through bolts; the stator assembly 6 comprises a stator base 61 and a stator unit 62, wherein the stator base 61 is fixedly arranged on the torque measurer 9, and the stator unit 62 is fixedly arranged on the stator base 61; further, the stator unit 62 is composed of a plurality of stator modules 62-1 having a sector-shaped disk-like structure; the stator module 62-1 includes a stator core and a stator winding wound around the stator core; the stator base 61 is in an open annular disc structure, and the stator modules 62-1 are uniformly distributed on the end face of the stator base 61 around the axial lead of the stator base 61; the permanent magnet synchronous motor is covered by a protective cover 5, and the protective cover 5 sleeved on the stator base 61 is fixed on the support column 12; the protective cover 5 is provided with an air inlet 51 and an air outlet 52, and the inner wall is provided with a heat insulation layer 53; the air inlet 51 is connected with an external cold air system; the encoder 4 includes a code wheel 41 and an induction element 42 for inducing the code wheel 41, the code wheel 41 is mounted on a rotor base 81, and the induction element 42 is mounted on the stator base 61 to correspond to the code wheel 41.
During operation, the vehicle tyre is in contact with the hub 10, the hub 10 is driven to rotate by the tyre of the vehicle after starting, at the moment, the hub 10 automatically simulates the resistance of the vehicle in the road running process by adopting the full-electric inertia simulation technology under the electromagnetic force action of the stator assembly 6 and the rotor assembly 8 of the permanent magnet synchronous motor, so that the measurement of each parameter in the vehicle running process is realized, the encoder 4 is used for detecting the rotating speed and the rotating angle of the rotating shaft 13, the rotating shaft 13 is connected with the main shaft 2 through the torque measurer 9, the torque measurer 9 measures the rotating torque value on the main shaft 2 in the shaft rotating process, the value is transmitted to the controller, and the controller indirectly calculates the real-time power of the vehicle according to the rotating speed of the rotating shaft 13.
Example III
As shown in fig. 10-11, a chassis dynamometer driven by a permanent magnet synchronous motor comprises a base 1, a main shaft 2, a primary gearbox 17, an encoder 4, a torque measurer 9 and a hub 10, wherein the base 1 comprises a bottom plate 11 and support columns 12 arranged on two sides of the bottom plate 11; the main shaft 2 is fixedly arranged between the support columns 12 through bearings 3; the hub 10 is fixed on the main shaft 2, the main shaft 2 is provided with electromagnetic resistance to simulate mechanical inertia by a permanent magnet synchronous motor, and the permanent magnet synchronous motor comprises a rotating shaft 13, a shell, a stator assembly 6 and a rotor assembly 8; the stator assembly 6 is fixedly mounted on the housing and provides a rotating resistance magnetic field for the rotor assembly 8; the rotor assembly 8 with permanent magnetic property is fixedly arranged on the rotating shaft 13 and corresponds to the stator assembly 6; the torque measurer 9 is arranged between the main shaft 2 and the rotating shaft 13 and is used for measuring the rotating torque between the shafts; the encoder 4 is used for measuring the rotation speed and rotation angle of the rotating shaft 13.
Preferably, the housing comprises a cylindrical cavity 16, a front pressing plate 15 and a rear pressing plate 14, wherein the front pressing plate 15 and the rear pressing plate 14 are detachably connected to two ends of the cylindrical cavity 16 through fastening bolts, and the rotating shaft 13 is installed in the front pressing plate and the rear pressing plate through bearings; the cylindrical cavity 16 is provided with first heat dissipation holes 161, and the first heat dissipation holes 161 are waist-shaped round holes and are uniformly distributed on the peripheral wall of the cylindrical cavity 16; the front pressing plate 15 is provided with a second heat dissipation hole 151, and the second heat dissipation hole 151 has a fan-shaped structure; the structure of the rear pressing plate 14 is the same as that of the front pressing plate 15; further, the permanent magnet synchronous motor is covered by a protective cover 5, and the protective cover 5 sleeved on the stator base 61 is fixed on the support column 12; the protective cover 5 is provided with an air inlet 51 and an air outlet 52, and the inner wall is provided with a heat insulation layer 53; the air inlet 51 is connected with an external cold air system; the rotor assembly 8 comprises a rotor base 81 and a plurality of magnetic steel substrates 82 which are uniformly distributed on the rotor base 81 around the axial lead of the main shaft 2, and the rotor base 81 is fixedly arranged on the rotating shaft 13 through a key 7; the stator assembly 6 comprises a stator base 61 and a stator unit 62, wherein the stator base 61 is fixedly arranged on the cylindrical cavity 16, and the stator unit 62 is fixedly arranged on the stator base 61; further, the stator unit 62 is composed of a plurality of stator modules 62-1 having a sector-shaped ring structure; the stator module 62-1 includes a stator core and a stator winding wound around the stator core; the stator modules 62-1 are uniformly distributed on the circumferential inner wall of the stator base 61 around the axial lead of the stator base 61; the encoder 4 comprises a code disc 41 and an induction element 42 for inducing the code disc 41, wherein the code disc 41 is arranged on the rotating shaft 13, and the induction element 42 is arranged on the cylindrical cavity 16 and corresponds to the code disc 41.
When the intelligent control device is in operation, the tyre of a vehicle is in contact with the hub 10, the tyre of the vehicle drives the hub 10 to rotate after the vehicle is started, at the moment, the hub 10 automatically simulates the resistance of the vehicle in the road running process by adopting the full-electric inertia simulation technology under the electromagnetic force action of the stator assembly 6 and the rotor assembly 8 of the permanent magnet synchronous motor, so that the measurement of each parameter in the vehicle running process is realized, the encoder 4 is used for detecting the rotating speed and the rotating angle of the rotating shaft 13, the output end of the rotating shaft 13 is connected with the input end of the primary gearbox 17, and the primary gearbox 17 is used for adjusting the working condition of the permanent magnet synchronous motor and carrying out buffer protection on the working condition of the permanent magnet synchronous motor; the output end of the primary gearbox 17 is connected with the main shaft 2 through the torque measurer 9, and in the shaft rotation process, the torque measurer 9 measures the rotating torque value on the main shaft 2, the value is transmitted to the controller, and the controller indirectly calculates the real-time power of the vehicle according to the rotating speed of the rotating shaft 13.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The chassis dynamometer driven by the permanent magnet synchronous motor comprises a base, a main shaft, an encoder, a torque measurer and a hub, wherein the main shaft is fixedly arranged on the base through a bearing; the hub is fixed on the main shaft, and is characterized in that the main shaft is provided with resistance by a permanent magnet synchronous motor, and the permanent magnet synchronous motor comprises a rotating shaft, a shell, a stator assembly and a rotor assembly; the stator assembly is fixedly arranged on the shell and provides a rotating resistance magnetic field for the rotor assembly; the rotor component with permanent magnetic property is fixedly arranged on the rotating shaft and corresponds to the stator component; the torque measurer is arranged between the main shaft and the rotating shaft and is used for measuring the rotating torque between the shafts; the encoder is used for measuring the rotating speed and the rotating angle of the rotating shaft; the stator assembly comprises a stator base and a stator unit, wherein the stator base is fixedly arranged on the shell, and the stator unit is fixedly arranged on the stator base; the stator unit consists of a plurality of stator modules with fan-shaped structures; the stator module comprises a stator iron core and a stator winding wound on the stator iron core;
the stator unit is divided into a plurality of independently controllable stator modules, and under the condition that the encoder accurately reads the relative positions of the rotor and the stator, each single stator module generates a specific magnetic field under the action of the controller, and electromagnetic force in the same rotation direction is generated for a single magnetic steel substrate passing through the magnetic field, so that rotating electromagnetic force is formed by combining the magnetic steel substrates together.
2. The chassis dynamometer driven by a permanent magnet synchronous motor according to claim 1, wherein the housing comprises a cylindrical cavity, a front pressing plate and a rear pressing plate, the front pressing plate and the rear pressing plate are detachably connected to two ends of the cylindrical cavity, and the rotating shaft is installed in the front pressing plate and the rear pressing plate through bearings.
3. The chassis dynamometer driven by a permanent magnet synchronous motor according to claim 2, wherein the cylindrical cavity is provided with a first heat dissipation hole.
4. The chassis dynamometer driven by a permanent magnet synchronous motor according to claim 2, wherein the front pressing plate is provided with a second heat dissipation hole; the structure of the rear pressing plate is the same as that of the front pressing plate.
5. A permanent magnet synchronous motor driven chassis dynamometer according to claim 3, wherein the permanent magnet synchronous motor is covered by a protective cover, and the protective cover sleeved on the stator assembly is fixed on the base; an air inlet and an air outlet are formed in the protective cover, and a heat insulation layer is arranged on the inner wall of the protective cover; the air inlet is connected with an external cold air system.
6. A permanent magnet synchronous motor driven chassis dynamometer according to claim 1 or 2, wherein the shaft has a through hole structure.
7. The chassis dynamometer driven by a permanent magnet synchronous motor according to claim 1, wherein the rotor assembly comprises a rotor base and a plurality of magnetic base steel plates uniformly distributed on the rotor base around a shaft axis, and the rotor base is fixedly installed on the shaft.
8. The chassis dynamometer driven by a permanent magnet synchronous motor according to claim 1, wherein the encoder comprises a code wheel and an induction element for inducing the code wheel, the code wheel is mounted on a rotating shaft or a rotor assembly, and the induction element is mounted on the housing or a stator assembly and corresponds to the code wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810735369.5A CN108663148B (en) | 2018-07-06 | 2018-07-06 | Chassis dynamometer driven by permanent magnet synchronous motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810735369.5A CN108663148B (en) | 2018-07-06 | 2018-07-06 | Chassis dynamometer driven by permanent magnet synchronous motor |
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| CN108663148A CN108663148A (en) | 2018-10-16 |
| CN108663148B true CN108663148B (en) | 2024-01-12 |
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|---|---|---|---|---|
| CN110221093B (en) * | 2019-05-28 | 2024-04-02 | 南方科技大学 | Immersed magnetic fluid rotating speed measuring device and manufacturing method thereof |
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