CN109724728B - A non-contact torque measuring device with variable speed function - Google Patents
A non-contact torque measuring device with variable speed function Download PDFInfo
- Publication number
- CN109724728B CN109724728B CN201811609181.2A CN201811609181A CN109724728B CN 109724728 B CN109724728 B CN 109724728B CN 201811609181 A CN201811609181 A CN 201811609181A CN 109724728 B CN109724728 B CN 109724728B
- Authority
- CN
- China
- Prior art keywords
- permanent magnet
- rotor
- squirrel
- magnet rotor
- magnetic field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Permanent Magnet Type Synchronous Machine (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a non-contact torque measuring device with a speed change function, which comprises: the device comprises a measuring module, a permanent magnet rotor, a squirrel cage rotor, a magnetic field modulation ring, a driving end and a driven end; the permanent magnet rotor is connected with the driving end, the squirrel cage rotor is connected with the driven end, and the torque of the permanent magnet rotor is transmitted to the squirrel cage rotor; the permanent magnet rotor, the magnetic field modulation ring and the squirrel cage rotor are sequentially nested from outside to inside and are coaxially installed; the measuring module is respectively in wireless connection with the permanent magnet rotor and the squirrel cage rotor, and is used for measuring the rotating speeds of the permanent magnet rotor and the squirrel cage rotor and calculating the torque between the permanent magnet rotor and the squirrel cage rotor according to the rotating speeds and the torque transmission ratio of the permanent magnet rotor and the squirrel cage rotor. The stepped speed regulation can be realized, the speed change function, the coupling function and the torque measurement are integrated, the highest rotating speed restriction is avoided, and the high-speed operation can be realized.
Description
Technical Field
The invention relates to the field of torque measuring devices, in particular to a non-contact torque measuring device with a speed change function.
Background
At present, most torque measuring devices measure torque by measuring strain of a strain gauge, so that measuring equipment is installed between a driving end and a driven end and is difficult to install in many narrow and small occasions; on the other hand, good mechanical centering is needed, otherwise, the device to be measured or the measuring device is easily damaged during high-speed rotation, and the mechanical centering is tedious and time-consuming. Meanwhile, the strain gauge used for torque measurement is easily damaged by external force or severe environment, and is difficult to repair. In many measurement test benches, a gearbox is required for speed change, while a mechanical gearbox requires lubrication and cooling, requires maintenance for long-term use, and is prone to fatigue damage.
Disclosure of Invention
The invention aims to provide a non-contact torque measuring device with a speed change function, which can realize a quick flexible coupling function and can calculate transmission torque through measurement of mechanical rotating speed.
In order to achieve the purpose, the invention provides the following scheme:
a non-contact torque measuring device having a speed change function, the measuring device comprising: the device comprises a permanent magnet rotor, a squirrel cage rotor, a magnetic field modulation ring, a driving end and a driven end;
the permanent magnet rotor and the squirrel cage rotor are connected with the driving end and the driven end, and the torque of the driving end is transmitted to the driven end;
the permanent magnet rotor, the magnetic field modulation ring and the squirrel cage rotor are sequentially nested from outside to inside and are coaxially installed;
the magnetic field modulation ring comprises a plurality of sections of modulation iron cores which are arranged in parallel, the plurality of sections of modulation iron cores are provided with slots, and the number of the slots of each section of the plurality of sections of modulation iron cores is different; each section of the modulation iron core is arranged between the permanent magnet rotor and the squirrel cage rotor, and the driving end and the driven end have different torque transfer multiplying powers and speed regulation ratios, so that the non-contact coupling device with the speed change function is realized.
Optionally, the measuring device further includes: a measurement module;
the measuring module is respectively connected with the permanent magnet rotor and the squirrel cage rotor, and is used for measuring the rotating speeds of the permanent magnet rotor and the squirrel cage rotor and calculating the torque transmitted between the permanent magnet rotor and the squirrel cage rotor according to the rotating speeds of the permanent magnet rotor and the squirrel cage rotor and the torque transmission multiplying power of the permanent magnet rotor and the squirrel cage rotor.
Optionally, the widths of the multiple sections of the modulation iron cores are all greater than or equal to the widths of the permanent magnet rotor and the squirrel cage rotor.
Optionally, the permanent magnet rotor, the squirrel cage rotor and the magnetic field modulation ring are all cylindrical structures;
the inner diameter of the permanent magnet rotor is larger than the outer diameter of the magnetic field modulation ring;
the inner diameter of the magnetic field modulation ring is larger than the outer diameter of the squirrel cage rotor;
the magnetic field modulation ring is provided with a slot, the size of the slot of each section of the magnetic field modulation ring is the same, and the spacing distance between every two slots is the same.
Optionally, the permanent magnet rotor includes: a permanent magnet rotor core and a permanent magnet;
the permanent magnet rotor iron core is a cylindrical structure formed by laminating soft magnetic materials;
the permanent magnets are arranged on the inner wall of the permanent magnet rotor iron core along the circumferential direction according to the alternating sequence of the N poles and the S poles.
Optionally, the squirrel-cage rotor includes a squirrel-cage rotor core, squirrel-cage bars and conductive end rings;
the squirrel-cage rotor iron core is of a cylindrical structure formed by laminating soft magnetic materials;
the outer circle of the squirrel-cage rotor iron core is provided with a conductor groove, and the squirrel-cage bars are arranged in the conductor groove;
and two ends of the squirrel cage bar are respectively connected by the conductive end ring.
Optionally, the measurement module includes: the device comprises a rotating speed measuring unit, a torque calculating unit and a communication unit;
the rotating speed measuring unit is respectively connected with the permanent magnet rotor and the squirrel cage rotor and is used for measuring the rotating speed of the permanent magnet rotor and the rotating speed of the squirrel cage rotor;
the torque calculation unit is connected with the rotating speed measurement unit and is used for calculating the torque transmitted between the permanent magnet rotor and the squirrel cage rotor according to the rotating speed of the permanent magnet rotor, the rotating speed of the squirrel cage rotor and the torque transmission rate;
the communication unit is respectively connected with the torque calculation unit and the user side, and is used for transmitting the torque transmitted between the permanent magnet rotor and the squirrel cage rotor to the user side.
Optionally, the torque measuring device includes: the magnetic field modulation device comprises a permanent magnet rotor, a magnetic field modulation ring and a squirrel cage rotor;
the squirrel-cage rotor is of a cylindrical structure, and the inner diameter of the squirrel-cage rotor is larger than the outer diameter of the magnetic field modulation ring;
the inner diameter of the magnetic field modulation ring is larger than the outer diameter of the permanent magnet rotor;
the permanent magnet rotor, the magnetic field modulation ring and the squirrel cage rotor are sequentially nested in three layers and are coaxially installed.
Optionally, the permanent magnet rotor includes a permanent magnet rotor core and a permanent magnet;
the permanent magnet rotor iron core is of a cylindrical structure formed by laminating soft magnetic materials;
the permanent magnets 3 are arranged on the outer surface of the permanent magnet rotor core with the cylindrical structure along the circumferential direction according to the alternating sequence of the N poles and the S poles;
the squirrel-cage rotor comprises a squirrel-cage rotor iron core and squirrel-cage bars;
the squirrel-cage rotor iron core is a cylindrical structure formed by laminating soft magnetic materials,
conductor grooves are formed in the inner circumference of the squirrel-cage rotor core;
the squirrel cage bars are arranged in the conductor grooves, and two ends of the squirrel cage bars are respectively connected by the conductive end rings.
Optionally, the magnetic field modulation ring is formed by at least one cylindrical modulation iron core with different slots in the circumferential direction in parallel, each modulation iron core has different slot numbers, and the width of each magnetic field modulation iron core is greater than and/or equal to the width of the permanent magnet rotor and the width of the squirrel cage rotor;
the magnetic field modulation ring is of a cylindrical structure, and is made of any one of soft magnetic materials such as silicon steel sheets, amorphous magnetic materials and the like.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention discloses a non-contact torque measuring device with a speed change function, comprising: the device comprises a measuring module, a permanent magnet rotor, a squirrel cage rotor, a magnetic field modulation ring, a driving end and a driven end; the permanent magnet rotor is connected with the driving end, the squirrel cage rotor is connected with the driven end, and the torque change of the permanent magnet rotor is transmitted to the squirrel cage rotor; the permanent magnet rotor, the magnetic field modulation ring and the squirrel cage rotor are sequentially nested from outside to inside and are coaxially fixed; the measuring module is respectively connected with the permanent magnet rotor and the squirrel cage rotor, and is used for measuring the rotating speeds of the permanent magnet rotor and the squirrel cage rotor and calculating the torque between the permanent magnet rotor and the squirrel cage rotor according to the rotating speeds and the torque transmission ratio of the permanent magnet rotor and the squirrel cage rotor. The coupling function can be realized, accurate centering is not needed, the installation and maintenance are simple and convenient, the stepped speed regulation can be realized, lubrication and cooling are not needed, maintenance is not needed, the use is convenient, the self-protection function is realized, the mechanical damage is prevented, the speed change function, the coupling function and the torque measurement are integrated, the space, the volume and the cost are saved, the highest rotating speed restriction is avoided, and the high-speed operation can be realized under the condition that the mechanical performance allows.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a front view of a noncontact torque measuring device with a speed change function according to embodiment 1 of the present invention;
fig. 2 is a cross-sectional view of a non-contact torque measuring device with a speed change function according to embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a magnetic field modulation ring of a non-contact torque measurement device with a speed change function according to embodiment 1 of the present invention;
fig. 4 is a schematic structural diagram of a magnetic field modulation ring of a non-contact torque measurement device with a speed change function according to embodiment 1 of the present invention;
fig. 5 is a schematic structural diagram of a middle slot of a magnetic field modulation ring of a non-contact torque measurement device with a speed change function according to embodiment 1 of the present invention;
fig. 6 is a schematic diagram of a magnetic field modulation ring of a non-contact torque measuring device with a speed change function according to embodiment 1 of the present invention moving to the right;
fig. 7 is a cross-sectional view of a magnetic field modulation ring of a non-contact torque measuring device with a speed change function according to embodiment 1 of the present invention, which is moved to the right;
fig. 8 is a cross-sectional view of a noncontact torque measuring device having a speed change function according to embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a non-contact torque measuring device with a speed change function, which can realize a quick flexible coupling function and can calculate transmission torque through measurement of mechanical rotating speed.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
As shown in fig. 1, 2, 6 and 7, a noncontact torque measuring device with a speed change function, the measuring device comprising: the device comprises a measuring module 7, a permanent magnet rotor, a squirrel cage rotor, a magnetic field modulation ring 8, a driving end 5 and a driven end 6;
the permanent magnet rotor is connected with the driving end 5, the squirrel cage rotor is connected with the driven end 6, and the torque change of the permanent magnet rotor is transmitted to the squirrel cage rotor;
the permanent magnet rotor, the magnetic field modulation ring 8 and the squirrel cage rotor are sequentially nested from outside to inside and are coaxially fixed;
the magnetic field modulation ring comprises a plurality of sections of modulation iron cores which are arranged in parallel, the plurality of sections of modulation iron cores are provided with slots, and the number of the slots of the plurality of sections of modulation iron cores is different;
the width of each of the multiple sections of modulation iron cores is greater than or equal to the width of the permanent magnet rotor and the width of the squirrel cage rotor; each section of the modulation iron core is arranged between the permanent magnet rotor and the squirrel cage rotor, and the stepless speed change between the driving end and the driven end is realized through each section of the modulation iron core;
the measuring module 7 is respectively connected with the permanent magnet rotor and the squirrel cage rotor, and the measuring module 7 is used for measuring the rotating speeds of the permanent magnet rotor and the squirrel cage rotor and calculating the torque ratio between the permanent magnet rotor and the squirrel cage rotor according to the rotating speeds of the permanent magnet rotor and the squirrel cage rotor.
The permanent magnet rotor, the squirrel cage rotor and the magnetic field modulation ring 8 are all cylindrical structures; the inner diameter of the permanent magnet rotor is larger than the outer diameter of the magnetic field modulation ring 8; the inner diameter of the magnetic field modulation ring 8 is larger than the outer diameter of the squirrel cage rotor.
The permanent magnet rotor includes: a permanent magnet rotor core 1 and a permanent magnet 3; the permanent magnet rotor iron core 1 is a cylindrical structure formed by laminating soft magnetic materials; the permanent magnets 3 are arranged on the inner wall of the permanent magnet rotor core along the circumferential direction according to the alternating sequence of the N poles and the S poles.
The squirrel-cage rotor comprises a squirrel-cage rotor iron core 2, squirrel-cage bars 4 and a conductive end ring; the squirrel-cage rotor iron core 2 is of a cylindrical structure formed by laminating soft magnetic materials; the outer circle of the squirrel-cage rotor iron core 2 is provided with conductor grooves, and the squirrel-cage bars 4 are arranged in the conductor grooves; and two ends of the squirrel cage bar 4 are respectively connected by the conductive end rings.
The width of the conductor slot and the conductor can be changed, when the conductor is widened in the circumferential direction, a plurality of conductors are connected to form a conductor ring, and the effect of the invention is not influenced.
The magnetic field modulation loop 8 includes: a magnetic field modulation ring first modulation iron core 801, a magnetic field modulation ring second modulation iron core 802, and a magnetic field modulation ring third modulation iron core 803; the magnetic field modulation ring first modulation iron core 801, the magnetic field modulation ring second modulation iron core 802 and the magnetic field modulation ring third modulation iron core 803 are arranged in parallel; the number of the slots of the first modulation iron core 801 of the magnetic field modulation ring, the second modulation iron core 802 of the magnetic field modulation ring and the third modulation iron core 803 of the magnetic field modulation ring are all different; the widths of the first modulation iron core 801, the second modulation iron core 802 and the third modulation iron core 803 of the magnetic field modulation ring are all larger than or equal to the widths of the permanent magnet rotor and the squirrel cage rotor.
The magnetic field modulation ring 8 is provided with slots, the size of each slot of the magnetic field modulation ring 8 is the same, and the distance between every two slots is the same.
The measurement module 7 includes: the device comprises a rotating speed measuring unit, a torque calculating unit and a communication unit; the rotating speed measuring unit is respectively connected with the permanent magnet rotor and the squirrel cage rotor and is used for measuring the rotating speed of the permanent magnet rotor and the rotating speed of the squirrel cage rotor; the torque calculation unit is connected with the rotating speed measurement unit and is used for calculating the torque transmitted between the permanent magnet rotor and the squirrel cage rotor according to the rotating speed of the permanent magnet rotor, the rotating speed of the squirrel cage rotor and the torque transmission rate; the communication unit is respectively connected with the torque calculation unit and the user side, and is used for transmitting the torque transmitted between the permanent magnet rotor and the squirrel cage rotor to the user side.
The rotating speed measuring unit is any one of a Hall sensor, a rotary transformer speed measuring sensor and a coded disc.
The permanent magnet rotor, the magnetic field modulation ring 8 and the squirrel cage rotor are cylindrical structures, the inner diameter of the permanent magnet rotor is larger than the outer diameter of the magnetic field modulation ring 8, and the inner diameter of the magnetic field modulation ring 8 is larger than the outer diameter of the squirrel cage rotor; the permanent magnet rotor consists of a permanent magnet rotor iron core 1 and a permanent magnet 3, the permanent magnet rotor iron core 1 is formed by laminating soft magnetic materials into a cylindrical structure, and can also be formed by amorphous magnetic conductive materials, wherein N, S poles of the permanent magnet 3 face the center of a circle, and the permanent magnet 3 is arranged on the inner wall of the permanent magnet rotor iron core 1 with the cylindrical structure along the circumferential direction according to N, S-pole alternating sequence; the squirrel-cage rotor consists of a squirrel-cage rotor iron core 2 and squirrel-cage bars 4, the squirrel-cage rotor iron core 2 is of a cylindrical structure formed by laminating soft magnetic materials or consists of amorphous magnetic conductive materials and the like, conductor grooves are uniformly distributed on the outer circumference of the squirrel-cage rotor iron core 2 of the cylindrical structure, the squirrel-cage bars 4 are arranged in the conductor grooves, the squirrel-cage bars 4 are copper or aluminum conductors, and two ends of the squirrel-cage bars 4 are respectively connected together by a conductive end ring; if the conductor is widened in the circumferential direction, the conductor grooves of the squirrel-cage rotor disappear, and finally a circular conductor surface can be formed, and the same is applicable. The magnetic field modulation ring 8 is composed of a magnetic field modulation ring first modulation core 801, a magnetic field modulation ring second modulation core 802, and a magnetic field modulation ring third modulation core 803 in parallel. The magnetic field modulation ring 8 can be formed by laminating soft magnetic materials to form a cylindrical structure, and can also be formed by magnetic conductive materials such as amorphous materials. The permanent magnet rotor, the magnetic field modulation ring 8 and the squirrel cage rotor are sequentially nested in three layers and are coaxially installed, and the permanent magnet 3 of the permanent magnet rotor, the squirrel cage bar 4 of the squirrel cage rotor and the magnetic field modulation ring 8 are ensured to be opposite.
According to the electromagnetic theory of the motor, the permanent magnet 3 of the permanent magnet rotor forms a magnetic field at an air gap between the permanent magnet rotor and the magnetic field modulation ring 8, the magnetic field is modulated by the magnetic field modulation ring 8 to form a modulated magnetic field between the magnetic field modulation ring 8 and the squirrel cage rotor, when the permanent magnet rotor rotates, the magnetic field rotates along with the permanent magnet rotor, the rotating magnetic field generates induction current in a squirrel cage bar 4 of the squirrel cage rotor, and the induction current cuts magnetic lines of force in the rotating magnetic field so as to apply force to drive the squirrel cage rotor to rotate, so that the torque of the permanent magnet rotor is transmitted to the squirrel cage rotor according to a certain torque transmission multiplying power. According to the principle of motion relativity, if the squirrel cage rotor actively rotates, the permanent magnet rotor can also be driven to rotate, and the torque of the squirrel cage rotor is transmitted to the permanent magnet rotor according to a certain torque transmission multiplying power. According to theoretical analysis, the relationship among the permanent magnet rotor speed n1, the squirrel-cage rotor speed n2, the permanent magnet rotor pole pair number P1 and the squirrel-cage rotor pole pair number P2 is as follows: n1/n2 ═ P2/P1. It can be seen that the ratio of the permanent magnet rotor to the squirrel cage rotor speed, i.e. the ratio of the transmission ratio to the pole pair number, is directly related. By varying the ratio of the pole pair numbers, the speed ratio, i.e. the transmission ratio, can be varied.
As shown in fig. 3, 4 and 5, the magnetic field modulation ring 8 is a cylindrical structure and can be grooved on the inner surface of the circumference, as shown in fig. 4; grooves can also be formed on the outer circumferential surface, as shown in FIG. 5; or a slot is formed in the middle of the magnetic field modulation ring, as shown in FIG. 3; the inner and outer surfaces of the circumference can also be grooved simultaneously, and the same effect can be achieved by the combination of the three schemes. All slots of each magnetic field modulation ring have the same geometric dimension and the same spacing distance. In order to ensure the effect of modulating the magnetic field, the general grooved part and the non-grooved part have the same or similar size in the circumferential direction, the grooved geometric size is similar to that of the non-grooved part, the grooved shape is not specifically limited, and the expected magnetic field modulation effect is realized. The groove shape may be appropriately adjusted in consideration of the mechanical strength of the magnetic field modulation ring 8, and holes are punched in the circumferential non-grooved portion of the magnetic field modulation ring 8 and fastened by means of the through bolts. One slot and the adjacent non-slot part are generally called as a pair of poles of the magnetic field modulation ring 8, so that the number of pole pairs and the number of slots of the magnetic field modulation ring 8 are the same.
And theoretical analysis shows that the sum of the pole pair number P1 of the permanent magnet rotor and the pole pair number P2 of the squirrel cage rotor is the number of slots of the magnetic field modulation ring 8, namely the pole pair number P3 of the modulation iron core. The constraint relationship between the three should be P3 ═ P1+ P2. Since the magnetic field of the cage rotor is induced by the external magnetic field, the number of pole pairs P2 of the cage rotor is determined by the number of pole pairs of the external magnetic field, i.e., P2-P1-P3. Therefore, under the condition that the pole pair number P1 of the permanent magnet rotor is fixed and unchanged, the pole pair number P3 of the magnetic field modulation ring 8 is changed, so that the pole pair number P2 of the squirrel cage rotor can be changed. Thereby realizing variable transmission ratio transmission of torque and rotating speed. In this embodiment, the magnetic field modulation ring 8 is divided into three segments, where each segment has a different number of slots, i.e., a different number of modulation core pole pairs P3, and the first modulation core 801 of the magnetic field modulation ring, the second modulation core 802 of the magnetic field modulation ring, and the third modulation core 803 of the magnetic field modulation ring.
The magnetic field modulation ring 8 shown in fig. 1 is divided into three segments, and the number of pole pairs P3 of each segment of the modulation core is different. As shown in fig. 6 and 7, the axial positions of the permanent magnet rotor and the squirrel cage rotor are kept unchanged, the magnetic field modulation ring 8 axially moves rightwards, the second modulation iron core 802 of the magnetic field modulation ring between the permanent magnet rotor and the squirrel cage rotor acts, and the transmission multiplying power of the torque and the rotating speed also changes simultaneously.
According to an aspect of the invention, the magnetic field formed between the field modulation ring 8 and the squirrel cage rotor is determined by the parameters of the permanent magnet rotor magnetic field and the field modulation ring 8. The number of pole pairs of the magnetic field is determined by the number of pole pairs of the permanent magnet rotor and the number of slots of the magnetic field modulation ring 8. The torque transfer rate is determined by the number of pole pairs of the permanent magnet rotor and the number of slots of the magnetic field modulation ring 8. The magnetic field modulation iron cores with different slot numbers are distributed in parallel in the axial direction, the width of each magnetic field modulation iron core is not less than the width of the permanent magnet rotor and the width of the squirrel cage rotor, and the magnetic field modulation iron cores with different slot numbers correspond to different torque transfer multiplying powers. The magnetic field modulation ring 8 can move along the axial direction, and the multiplying power of torque transmission is changed by changing the magnetic field modulation iron core acting between the permanent magnet rotor and the squirrel cage rotor, so that the speed regulation effect is achieved.
According to the electromagnetic theory of the motor, the torque transmitted to the inner rotor by the outer rotor is related to the rotation speed difference between the outer rotor and the inner rotor and the multiplying power of torque transmission, and the transmitted torque can be obtained by knowing the rotation speed difference between the outer rotor and the inner rotor and the multiplying power of torque transmission. The measuring module 7 is composed of a rotating speed measuring unit, a torque calculating unit and a communication unit, wherein the measuring unit measures the speeds of the outer rotor and the inner rotor, the torque calculating unit calculates the torque transmitted between the outer rotor and the inner rotor according to the speed difference and the torque transmission multiplying power of the outer rotor and the inner rotor, and the communication unit transmits the torque measuring result to the client terminal. When the non-contact torque measuring device with the speed change function is designed, the relationship between the magnitude of the transmission torque and the difference of the rotating speed of the outer rotor and the inner rotor under the action of different magnetic field modulation rings 8 can be obtained through a simulation means, the relationship is stored in a torque calculation unit, and the torque calculation unit can obtain the transmitted torque through table lookup of the relationship in the normal use process. But the simulation result has certain error with the real transmission torque, and the error is caused by loss. The torque loss can be calculated according to the rotating speeds of the inner rotor and the outer rotor, and the torque measurement result is compensated and corrected, so that the measurement result is more accurate. The relationship between the magnitude of the transmission torque and the difference between the rotation speeds of the different magnetic field modulation rings 8 under action can be obtained through experiments after the non-contact torque measuring device with the speed change function is processed and manufactured, and the relationship is stored in the torque calculation unit.
The measuring module 7 is fixed on a static component or an outer rotor or an inner rotor; when the measuring module 7 is fixed on a static component and is not moved, the measuring module 7 comprises at least two speed measuring devices which respectively measure the absolute speed of the inner rotor and the absolute speed of the outer rotor, and the communication unit transmits a torque result calculated according to the measuring signals to a client terminal through a bus or wireless communication; when the measuring module 7 is fixed on the inner rotor or the outer rotor, the measuring module 7 comprises at least one speed sensor measuring device for measuring the speed difference between the inner rotor and the outer rotor, and the communication unit transmits the torque result calculated according to the measuring signal to the client terminal through wireless communication.
According to an aspect of the present invention, the rotation speed measuring unit of the measuring module 7 measures the rotation speeds of the outer rotor and the inner rotor by at least one of hall velocity measurement, resolver velocity measurement, and code wheel velocity measurement. The rotation speed measuring unit of the measuring module 7 needs to measure the speeds of the outer rotor and the inner rotor at the same time, or measure the speed difference between the inner rotor and the outer rotor and the speed of one of the outer rotor or the inner rotor.
According to one aspect of the present invention, the torque calculated by the torque calculation unit of the measurement module 7 according to the difference between the rotational speeds of the inner rotor and the outer rotor does not include torque loss, the torque loss is calculated according to the rotational speeds of the inner rotor and the outer rotor, and the torque measurement result is compensated and corrected, so that the measurement result is more accurate.
According to one aspect of the invention, when the torque of the active end 5 exceeds the design value, the outer rotor and the inner rotor do not perform torque transmission any more, the tested equipment can be effectively protected, and the torque measurement is stopped at the moment.
Example 2
Fig. 8 shows a non-contact torque measuring device with a speed change function according to a second embodiment of the present invention, which includes a permanent magnet rotor, a magnetic field modulation ring 8, and a cage rotor having a cylindrical structure and an inner diameter larger than an outer diameter of the magnetic field modulation ring 8, the inner diameter of the magnetic field modulation ring 8 being larger than the outer diameter of the permanent magnet rotor; the permanent magnet rotor consists of a permanent magnet rotor iron core 1 and a permanent magnet 3, the permanent magnet rotor iron core 1 can be formed by laminating silicon steel sheets or other soft magnetic materials into a cylindrical structure or can be formed by amorphous magnetic conductive materials, the N, S poles of the permanent magnet 3 face the center of a circle, and the permanent magnet 3 is arranged on the outer wall of the permanent magnet rotor iron core 1 of the cylindrical structure along the circumferential direction according to the N, S-pole alternating sequence; the squirrel-cage rotor consists of a squirrel-cage rotor iron core 2 and squirrel-cage bars 4, the squirrel-cage rotor iron core 2 can be formed into a cylindrical structure by laminating silicon steel sheets or other soft magnetic materials, and can also be formed by amorphous and other magnetic conductive materials, conductor grooves are uniformly distributed on the inner circumference of the squirrel-cage rotor iron core 2 of the cylindrical structure, the squirrel-cage bars 4 are arranged in the conductor grooves, the squirrel-cage bars 4 are copper or aluminum conductors, and two ends of the squirrel-cage bars 4 are respectively connected together by conductive end rings; the circumferential direction of the conductor is widened, the conductor groove of the squirrel-cage rotor disappears, and finally a circular conductor surface can be formed, so that the method is also applicable. The magnetic field modulation ring 8 is formed by arranging one section or a plurality of sections of cylindrical modulation iron cores with different slots in the circumferential direction in parallel, each section of modulation iron core has different slot numbers, and the width of each section of magnetic field modulation iron core is not less than the width of the permanent magnet rotor and the squirrel cage rotor. The magnetic field modulation ring 8 is formed by laminating soft magnetic materials to form a cylindrical structure, and can also be formed by magnetic conductive materials such as amorphous materials. The permanent magnet rotor, the magnetic field modulation ring 8 and the squirrel cage rotor are sequentially nested in three layers and are coaxially installed, and the permanent magnet 3 of the permanent magnet rotor, the squirrel cage bar 4 of the squirrel cage rotor and the magnetic field modulation ring 8 are ensured to be opposite.
The magnetic field modulation ring, the permanent magnet rotor iron core and the squirrel cage rotor iron core are made of any one of soft magnetic materials such as silicon steel sheets, amorphous magnetic materials and the like.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811609181.2A CN109724728B (en) | 2018-12-27 | 2018-12-27 | A non-contact torque measuring device with variable speed function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811609181.2A CN109724728B (en) | 2018-12-27 | 2018-12-27 | A non-contact torque measuring device with variable speed function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109724728A CN109724728A (en) | 2019-05-07 |
| CN109724728B true CN109724728B (en) | 2021-05-04 |
Family
ID=66296520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811609181.2A Active CN109724728B (en) | 2018-12-27 | 2018-12-27 | A non-contact torque measuring device with variable speed function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109724728B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2220065Y (en) * | 1994-10-07 | 1996-02-14 | 李国林 | Intelligence coupling |
| CN201181299Y (en) * | 2008-03-19 | 2009-01-14 | 北京化工大学 | Magnetic external torque measuring device |
| CN107923803A (en) * | 2015-10-20 | 2018-04-17 | 伊格尔工业股份有限公司 | Contactless torque measuring method |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2457682B (en) * | 2008-02-21 | 2012-03-28 | Magnomatics Ltd | Variable magnetic gears |
| CN201476961U (en) * | 2009-08-13 | 2010-05-19 | 合肥市华林模具有限公司 | Coupler test board |
| JP5381621B2 (en) * | 2009-10-30 | 2014-01-08 | 株式会社豊田中央研究所 | Magnetic multi-stage transmission mechanism and composite magnetic multi-stage transmission mechanism |
| CN102374272B (en) * | 2010-08-27 | 2014-02-19 | 鸿富锦精密工业（深圳）有限公司 | Magnetic gear |
| CN103840637B (en) * | 2014-03-17 | 2016-09-07 | 华中科技大学 | Magnetic field modulation type permanent magnetic coupling |
| CN104500691B (en) * | 2014-12-17 | 2017-01-25 | 大连理工大学 | Permanent magnetic transmission gearbox |
| CN105048744A (en) * | 2015-07-17 | 2015-11-11 | 中国科学院电工研究所 | Cast copper rotor for variable frequency motor |
| CN205004939U (en) * | 2015-09-15 | 2016-01-27 | 南京艾凌节能技术有限公司 | Tombarthite permanent magnetism variable speed clutch |
| US10381912B2 (en) * | 2015-12-17 | 2019-08-13 | Hitachi Metals, Ltd. | Magnetic transmission |
| CN206195589U (en) * | 2016-12-01 | 2017-05-24 | 大连交通大学 | With core type permanent magnetism gear based on cage modle rotor |
-
2018
- 2018-12-27 CN CN201811609181.2A patent/CN109724728B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2220065Y (en) * | 1994-10-07 | 1996-02-14 | 李国林 | Intelligence coupling |
| CN201181299Y (en) * | 2008-03-19 | 2009-01-14 | 北京化工大学 | Magnetic external torque measuring device |
| CN107923803A (en) * | 2015-10-20 | 2018-04-17 | 伊格尔工业股份有限公司 | Contactless torque measuring method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109724728A (en) | 2019-05-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3176931B1 (en) | Winding type permanent magnet coupling transmission device | |
| KR102099979B1 (en) | A generator using two rotors which can use a rotary shaft or a fixed shaft | |
| JP5330671B2 (en) | Control of double rotor electromagnetic device | |
| EP3598617A2 (en) | High torque density electrical machine | |
| EP2437381B1 (en) | Moving magnetic field generating apparatus | |
| CN102064647B (en) | Multi-stator arc motor for photoelectric tracking equipment | |
| CN101404440A (en) | Large-torque non-contact permanent magnet gear transmission based on space magnetic conductance modulation | |
| US20170104388A1 (en) | Method and apparatus for compact axial flux magnetically geared machines | |
| GB2032197A (en) | Dc motors | |
| US10781547B2 (en) | Washing machine | |
| Uppalapati et al. | A flux focusing ferrite magnetic gear | |
| CN110299815B (en) | Coaxial dual-rotor variable-speed electromagnetic driver | |
| CN109341913B (en) | A torque measuring device | |
| CN102624197A (en) | A speed-adjustable asynchronous magnetic coupling with adjustable radial air gap | |
| CN109724728B (en) | A non-contact torque measuring device with variable speed function | |
| Tsai et al. | Characteristics measurement of electric motors by contactless eddy-current magnetic coupler | |
| CN105406687A (en) | Permanent magnet adjustable-speed motor | |
| US20200136484A1 (en) | Rotating electric machine | |
| US20180294686A1 (en) | Stator for Rotating Electric Machine | |
| CN111077450B (en) | Variable load device for motor test | |
| Zaytoon et al. | Cogging torque reduction of axial magnetic gearbox using pole pairing technique | |
| CN106787604B (en) | Multi-slip cascaded permanent magnet speed control device | |
| KR20200071343A (en) | high speed motor | |
| Nagrial et al. | Design of synchronous torque couplers | |
| Charpentier et al. | Mechanical behavior of axially magnetized permanent-magnet gears |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |