CN111799981A - Permanent magnet coupling direct-drive device - Google Patents
Permanent magnet coupling direct-drive device Download PDFInfo
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- CN111799981A CN111799981A CN202010732104.7A CN202010732104A CN111799981A CN 111799981 A CN111799981 A CN 111799981A CN 202010732104 A CN202010732104 A CN 202010732104A CN 111799981 A CN111799981 A CN 111799981A
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- permanent magnet
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- output shaft
- assembly
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/02—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type
- H02K49/04—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type
- H02K49/043—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type with a radial airgap
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
- H02K49/104—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
- H02K49/106—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element with a radial air gap
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The invention discloses a permanent magnet coupling direct-drive device which comprises a machine shell, and a stator assembly, a permanent magnet rotor assembly, a conductor rotor assembly and an output shaft which are coaxially arranged in the machine shell from outside to inside in sequence. The output shaft rotates and is connected in the casing, and the conductor rotor subassembly links firmly in the output shaft. The stator assembly is fixedly connected with the machine shell and is used for communicating external multi-phase alternating current and generating a rotating magnetic field. The permanent magnet rotor component is rotationally connected with the shell or the output shaft, and the permanent magnet rotor component drives the permanent magnet rotor component to rotate through the interaction of the permanent magnetic field and the rotating magnetic field. The conductor rotor assembly cuts the rotating permanent magnetic field and generates torque, and the torque drives the conductor rotor assembly to rotate so as to drive the output shaft to rotate. The invention integrates the advantages of the permanent magnet synchronous motor and the asynchronous induction motor, and can solve the problems of large starting impact, easy demagnetization of locked rotor and the like of the existing permanent magnet synchronous motor, and the problems of low efficiency, difficult direct starting of large rotational inertia load, easy burnout of locked rotor and the like of the asynchronous motor.
Description
Technical Field
The invention belongs to the technical field of permanent magnet driving, and particularly relates to a permanent magnet coupling direct-drive device.
Background
The permanent magnet synchronous motor adopts permanent magnet excitation, has the advantages of high power factor, high efficiency, wide efficient operation range and the like, can design high pole number to directly drive load operation, and shortens a transmission chain. For an asynchronous starting permanent magnet synchronous motor, in the starting process, a starting cage on a permanent magnet rotor cuts a rotating magnetic field generated after a stator winding is electrified, so that induction current is generated on the starting cage, and further, torque is generated to drive the permanent magnet rotor to operate.
The asynchronous starting permanent magnet synchronous motor has short starting time, can cause the rotating speed of a load to be rapidly increased to a synchronous rotating speed, and has large acceleration and large starting impact. When the asynchronous starting permanent magnet synchronous motor drives a large-rotational-inertia load, the starting time required for accelerating the load to a rated process is long, the motor rotor can be in an asynchronous state for a long time, and a starting cage on the permanent magnet rotor can induce to generate a large amount of heat, so that the permanent magnet on the rotor is easily demagnetized, and a motor winding is easily burnt. Meanwhile, when the permanent magnet synchronous motor drives a load to run synchronously, once the load is locked or the load torque is too large, the motor will lose step, and a large amount of heat can be induced on the permanent magnet rotor, so that the permanent magnet is easy to demagnetize.
To realize the buffer start of the permanent magnet synchronous motor operated at power frequency, at present, an electric device is mainly added at the front end of the motor. In the prior art, a direct starting method of a permanent magnet synchronous motor for power frequency operation is provided, wherein a frequency converter is adopted to realize the buffer starting of the permanent magnet synchronous motor, and then the frequency converter is disconnected for direct power frequency operation; there is also a device which can realize the soft start of the permanent magnet synchronous motor without a frequency converter. However, these methods require additional electronic components, which not only increases the cost, but also reduces the reliability of the system.
The asynchronous induction motor generates an excitation magnetic field through induction on the rotor, the permanent magnet does not exist in the rotor, the problem of high-temperature demagnetization of the permanent magnet does not exist, but compared with an asynchronous starting permanent magnet synchronous motor, the starting time of the asynchronous induction motor can be relatively longer, when a large moment of inertia load is started, the asynchronous induction motor can also be in a high-slip-rate operation and load acceleration state for a long time, so that the current of a stator winding is large, the heat is overlarge, the large moment of inertia load cannot be directly started, and the problem that the asynchronous induction motor is easy to burn out when in rotation blockage and the like also exists. Meanwhile, the asynchronous induction motor is difficult to design into a high pole number to directly drive a low-speed load, and the efficiency and power factor of the asynchronous induction motor are rapidly reduced at a low load rate.
Disclosure of Invention
The invention aims to provide a permanent magnet coupling direct-drive device, which integrates the advantages of a permanent magnet synchronous motor and an asynchronous induction motor and solves the problems that the permanent magnet synchronous motor has large starting impact and the asynchronous induction motor is difficult to directly start a large-rotational-inertia load in the prior art.
The technical scheme of the invention is as follows:
a permanent magnet coupling direct-drive device is characterized by comprising a machine shell, and a stator assembly, a permanent magnet rotor assembly, a conductor rotor assembly and an output shaft which are coaxially arranged in the machine shell from outside to inside in sequence;
the output shaft is rotationally connected with the shell;
the conductor rotor assembly is fixedly connected to the output shaft;
the stator assembly is fixedly connected with the shell and is used for communicating external multi-phase alternating current and generating a rotating magnetic field;
the permanent magnet rotor assembly is rotationally connected with the shell or the output shaft and is driven to rotate through the interaction of a permanent magnetic field and the rotating magnetic field;
the conductor rotor assembly cuts the rotating permanent magnetic field and generates torque, and the torque drives the conductor rotor assembly to rotate so as to drive the output shaft to rotate.
Preferably, in an embodiment of the present invention, the stator assembly includes a stator core and stator windings, the stator core is fixedly connected to the casing, the stator windings are annularly and uniformly distributed on an inner side of the stator core, and the stator windings are used for communicating the external multi-phase alternating current.
Preferably, in an embodiment of the present invention, the permanent magnet rotor assembly includes a permanent magnet, a permanent magnet rotor core and permanent magnet rotor conductor bars, the permanent magnet rotor core is rotatably connected to the casing or the output shaft, the permanent magnet and the permanent magnet rotor conductor bars are respectively and uniformly distributed in an annular manner on the permanent magnet rotor core, the permanent magnet is located on the inner side of the permanent magnet rotor conductor bars, and the permanent magnet is used for generating the permanent magnetic field.
Preferably, in an embodiment of the present invention, the conductor rotor assembly includes conductor rotor conductors and a conductor rotor core, the conductor rotor conductors are distributed outside the conductor rotor core, the conductor rotor core is fixedly connected to the output shaft, and the conductor rotor conductors are used for cutting the rotating permanent magnetic field.
Preferably, according to an embodiment of the present invention, air gaps are distributed between the permanent magnet rotor assembly and the stator assembly and between the permanent magnet rotor assembly and the conductor rotor assembly, respectively.
Preferably, in an embodiment of the present invention, magnetic isolation bridges are annularly distributed on the permanent magnet rotor core.
Preferably, in an embodiment of the present invention, two ends of the permanent magnet rotor assembly in the axial direction are respectively provided with a permanent magnet rotor conductor ring, and two ends of each permanent magnet rotor conductor bar in the axial direction are respectively connected to the corresponding permanent magnet rotor conductor ring and cooperate to form a squirrel-cage-shaped closed loop.
Preferably, in an embodiment of the present invention, the conductor rotor conductor is a metal cylinder, and the metal cylinder is sleeved on the conductor rotor core and connected to the conductor rotor core.
Preferably, in an embodiment of the present invention, the conductor rotor conductor includes a plurality of conductor rotor conductor bars, the conductor rotor conductor bars are annularly and uniformly distributed on the peripheral side of the conductor rotor core, two ends of the conductor rotor assembly in the axial direction are respectively provided with a conductor rotor conductor ring, and two ends of each conductor rotor conductor bar in the axial direction are respectively connected with the corresponding conductor rotor conductor ring and cooperate to form a squirrel-cage-shaped closed loop.
Preferably, in an embodiment of the present invention, the output shaft and the housing are rotatably connected through a bearing, two ends of the permanent magnet rotor core in the axial direction are respectively connected to a supporting cover, and the supporting covers are rotatably connected to the housing or the output shaft through bearings.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
(1) according to the permanent magnet coupling direct-drive device provided by the invention, a rotating magnetic field is generated after external multi-phase alternating current is conducted to a stator winding on a stator component, and the rotating magnetic field and a permanent magnetic field of a permanent magnet rotor component interact to drive the permanent magnet rotor component to synchronously rotate; the rotating permanent magnet rotor assembly and the stationary conductor rotor assembly rotate relatively, so that the conductor rotor assembly cuts a rotating permanent magnet field, and the conductor rotor assembly generates electromagnetic force to drive the conductor rotor assembly and the load to rotate. When the device is started, the rotating speed of the permanent magnet rotor assembly is rapidly increased to be synchronous with the rotating magnetic field, the conductor rotor assembly and the load are slowly accelerated, the starting impact can be effectively relieved, and meanwhile, when the permanent magnet coupling direct-drive device is started for a load with large rotational inertia, the current of the stator winding cannot be in a large-current state for a long time, so that the stator winding is prevented from being burnt out due to overheating. Therefore, the problems that the permanent magnet synchronous motor in the prior art has large starting impact and the asynchronous induction motor is difficult to directly start a large-moment-of-inertia load are solved.
(2) According to the permanent magnet coupling direct-drive device provided by the embodiment of the invention, the excitation magnetic field is provided by the permanent magnet in the operation process, the stator winding is not required to provide excitation current, the power factor is high, the device can be designed to be used for directly driving a load to operate with high pole number, and the device can also be used for keeping high-efficiency operation in a low-load state.
(3) According to the permanent magnet coupling direct-drive device provided by the embodiment of the invention, when the load connected with the conductor rotor assembly is locked up or the resistance is suddenly overlarge, the permanent magnet rotor assembly still keeps synchronous operation with the rotating magnetic field generated by the stator winding, the eddy current loss cannot be generated on the permanent magnet rotor assembly, the eddy current loss is only generated on the conductor rotor assembly, and the permanent magnet on the permanent magnet rotor assembly cannot be burnt at high temperature.
(4) According to the permanent magnet coupling direct-drive device provided by the embodiment of the invention, the torque transmitted between the permanent magnet rotor assembly and the conductor rotor assembly has an extreme value, when the load resistance connected with the conductor rotor assembly suddenly exceeds the maximum torque, the conductor rotor assembly and the load are decelerated to stop, the output torque is reduced, the burning of a stator winding due to overlarge current is avoided, and the torque protection function is realized.
(5) In the permanent magnet coupling direct-drive device provided by the embodiment of the invention, the magnetic isolation magnetic bridge is arranged on the permanent magnet rotor iron core, so that main magnetic flux generated by the permanent magnet is interlinked with the stator winding through an external air gap (namely, an air gap between the permanent magnet rotor assembly and the stator assembly), and is interlinked with a conductor rotor conductor on the conductor rotor assembly through an internal air gap (namely, an air gap between the permanent magnet rotor assembly and the conductor rotor assembly).
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a schematic front sectional view of a permanent magnet coupling direct drive device according to the present invention;
FIG. 2 is a schematic side sectional view of a permanent magnet coupling direct drive device according to the present invention;
FIG. 3 is an enlarged schematic view of an area A of a permanent magnet coupling direct drive device according to the present invention;
fig. 4 is an enlarged schematic view of a region B of the permanent magnet coupling direct drive device of the present invention.
Description of reference numerals:
1: a housing; 2: a stator assembly; 21: a stator core; 22: a stator winding; 3: a permanent magnet rotor assembly; 31: a permanent magnet rotor core; 32: a permanent magnet; 33: permanent magnet rotor conductor bars; 34: a permanent magnet rotor conductor ring; 4: a conductor rotor assembly; 41: conductor rotor conductor bars; 42: a conductor rotor core; 43: a conductor rotor conductor ring; 5: an output shaft; 6: a magnetic isolation magnetic bridge; 7: a support cover; 8: and a bearing.
Detailed Description
The permanent magnet coupling direct drive device provided by the invention is further described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise ratio for the purpose of facilitating and distinctly aiding in the description of the embodiments of the invention.
Meanwhile, the expressions "first", "second", etc. are used only for the purpose of distinguishing a plurality of configurations, and do not limit the order between the configurations or other features.
Also, the expression "comprising" an element is an expression of "open" which merely means that there is a corresponding component, and should not be interpreted as excluding additional components.
Referring to fig. 1 to 4, the embodiment provides a permanent magnet coupling direct drive device, which includes a casing 1, and a stator assembly 2, a permanent magnet rotor assembly 3, a conductor rotor assembly 4, and an output shaft 5 coaxially disposed in the casing 1 from outside to inside in sequence. The output shaft 5 is rotationally connected to the machine shell 1, and the conductor rotor assembly 4 is fixedly connected to the output shaft 5. The stator assembly 2 is fixedly connected with the machine shell 1, and the stator assembly 2 is used for communicating external multi-phase alternating current and generating a rotating magnetic field. The permanent magnet rotor component 3 is rotationally connected with the machine shell 1 or the output shaft 5, and the permanent magnet rotor component 3 is driven to rotate through the interaction of a permanent magnetic field and a rotating magnetic field. The conductor rotor assembly 4 cuts the rotating permanent magnetic field and generates rotation to drive the output shaft 5 to rotate.
A rotating magnetic field generated after external multi-phase alternating current is conducted to a stator winding 22 on the stator assembly 2 interacts with a permanent magnetic field of the permanent magnetic rotor assembly 3 to drive the permanent magnetic rotor assembly 3 to rotate synchronously; the rotating permanent magnet rotor assembly 3 and the stationary conductor rotor assembly 4 rotate relative to each other, so that the conductor rotor assembly 4 cuts the rotating permanent magnet field, and the conductor rotor assembly 4 generates electromagnetic force to drive the conductor rotor assembly 4 and the load to rotate. 3 rotational speeds of permanent magnet rotor subassembly when the device starts increase to the synchronous speed with rotating magnetic field fast, and conductor rotor subassembly 4 and load are then slow acceleration rate, can effectively alleviate and start the impact, and simultaneously, the permanent magnetism coupling of this embodiment directly drives the device when starting big inertia load, and the stator winding current can not be in the heavy current state for a long time, has avoided the stator winding overheated burnout.
The structure of the present embodiment will now be explained.
The stator assembly 2 comprises a stator winding 22 and a stator core 21, and the stator core 21 is fixedly connected with the machine shell 1 through positioning embedding. Specifically, in this embodiment, a positioning groove may be formed on an outer side wall of the stator core 21, a positioning rib matched with the positioning groove is disposed on an inner surface of the housing 1, and the stator core 21 and the housing 1 are fixedly connected by embedding the positioning rib into the corresponding positioning groove; of course, in other embodiments, the stator core 21 and the casing 1 may be connected in other manners, which is not limited herein. The stator core 21 is a cylinder with a circular cross section, the inner side of the stator core 21 is provided with a plurality of first accommodating grooves for installing the stator windings 22 along the axial direction, and the plurality of first accommodating grooves are annularly and uniformly distributed on the inner side of the stator core 21, so that the stator windings 22 are also annularly and uniformly distributed on the part of the stator core 21 close to the inner side. When a multi-phase alternating current is applied to the stator winding 22, a rotating magnetic field is generated.
The permanent magnet rotor assembly 3 comprises permanent magnets 32, a permanent magnet rotor core 31 and permanent magnet rotor conductor bars 33. The permanent magnet rotor core 31 is rotatably connected to the casing 1 or the output shaft 5, specifically, in the present embodiment, the two ends of the permanent magnet rotor core 31 in the axial direction are respectively connected to the supporting covers 7, and the supporting covers 7 are rotatably connected to the output shaft 5 through the bearings 8. A plurality of second accommodating grooves are annularly and uniformly distributed on the outer side part of the permanent magnet rotor core 31, the length direction of the second accommodating grooves is the axial direction and is used for installing the permanent magnet rotor conductor bars 33, and therefore the permanent magnet rotor conductor bars 33 are annularly and uniformly distributed on the outer side part of the permanent magnet rotor core 31. The two ends of the permanent magnet rotor component 3 are respectively connected by a permanent magnet rotor conductor ring 34 to form a closed loop. Specifically, two axial ends of the permanent magnet rotor assembly 3 may be respectively provided with a permanent magnet rotor conductor ring 34, and two axial ends of each permanent magnet rotor conductor bar 33 are respectively connected with the corresponding permanent magnet rotor conductor ring 34 at the same end, and are matched to form a squirrel-cage-shaped closed loop.
A plurality of third accommodating grooves are uniformly formed in the permanent magnet rotor core 31 in an annular manner, and the length direction of the third accommodating grooves is the axial direction and is used for installing the permanent magnets 32, so that the permanent magnets 32 are uniformly distributed on the permanent magnet rotor core 31 in a reversing manner. While the ring-shaped arrangement of permanent magnets 32 is located inside the ring-shaped arrangement of permanent magnet rotor bars 33. The permanent magnet 32 generates a permanent magnetic field.
When the permanent magnet coupling direct drive device provided by this embodiment is started, each permanent magnet rotor conductor bar 33 cuts the rotating magnetic field generated by the stator winding 22 and generates an induced current, and a closed loop is formed through the permanent magnet rotor conductor rings 34 at the two ends, so that an electromagnetic torque is generated on the permanent magnet rotor conductor bars 33 to drive the permanent magnet rotor assembly 3 to be started quickly. When the permanent magnet rotor assembly 3 is switched into synchronous rotation speed, the permanent magnet rotor conductor bars 33 do not generate induced current any more, and at the moment, the permanent magnetic field generated by the permanent magnet 32 interacts with the rotating magnetic field generated by the stator winding 22 to generate electromagnetic torque on the permanent magnet 32, so that the permanent magnet rotor assembly 3 is driven to operate.
The conductor rotor assembly 4 includes a conductor rotor conductor and a conductor rotor core 42. The conductor rotor core 42 is a cylinder with a circular cross section, and the inner side of the conductor rotor core 42 is in interference fit with the output shaft 5 so as to be fixedly connected. The conductor rotor conductors are all distributed in the conductor rotor core 42. The conductor rotor conductor can be a metal cylinder, is sleeved on the conductor rotor iron core 42 and is connected with the conductor rotor iron core 42; the conductor rotor conductor may also include a plurality of conductor rotor conductor bars, which are embedded on the conductor rotor core 42 and connected at both ends by the conductor rotor conductor rings 43; or the conductor rotor conductor may be in other forms, and is not limited herein. Specifically, in the present embodiment, the conductor rotor conductor is a plurality of conductor rotor conductor bars 41. A plurality of fourth accommodating grooves are uniformly and annularly formed in the outer side portion of the conductor rotor core 42, and the length direction of the fourth accommodating grooves is the axial direction and is used for installing the conductor rotor conductor bars 41, so that the conductor rotor conductor bars 41 are uniformly distributed in the outer side portion of the conductor rotor core 42. The two ends of the conductor rotor conductor are connected by the conductor rotor conductor ring 43 to form a closed circuit. Specifically, two ends of the conductor rotor assembly 4 in the axial direction may be respectively provided with one conductor rotor conductor ring 43, and two ends of each conductor rotor conductor bar 41 in the axial direction are respectively connected with the conductor rotor conductor ring 43 corresponding to the same end, and cooperate to form a squirrel-cage-shaped closed loop.
There is a gap between the permanent magnet rotor assembly 3 and the stator assembly 2 and conductor rotor assembly 4, respectively. The air gap between the permanent magnet rotor assembly 3 and the stator assembly 2, referred to as the outer air gap; the air gap between the permanent magnet rotor assembly 3 and the conductor rotor assembly 4 is referred to as the internal air gap. The presence of the outer and inner air gaps allows the permanent magnet rotor conductor assembly to rotate relative to the stator assembly 2 and conductor rotor assembly 4.
The output shaft 5 and the machine shell 1 can be rotationally connected through a bearing 8, the output shaft 5 is used for being connected with a load of the permanent magnet coupling direct-drive device, and the output shaft 5 drives the load to rotate when rotating.
The conductor rotor assembly 4 is rotatable relative to the housing 1 (via the output shaft 5) and the permanent magnet rotor assembly 3. During starting or running, the conductor rotor conductor bars 41 cut the permanent magnetic field generated by the permanent magnets 32 and generate induced current, a current loop is formed through the conductor rotor conductor rings 43 at the two ends, and electromagnetic torque is generated on the conductor rotor conductor bars 41 to drive the conductor rotor assembly 4 to rotate.
Wherein, the permanent magnet rotor conductor bars 33 and the conductor rotor conductor bars 41 can be both metal conductor bars.
Preferably, a magnetic isolation bridge 6 is provided on the permanent magnet rotor core 31, so that the main magnetic flux generated by the permanent magnets 32 is interlinked with the stator winding 22 through the external air gap (i.e. the air gap between the permanent magnet rotor assembly 3 and the stator assembly 2), and is also interlinked with the conductor rotor conductor bars 41 on the conductor rotor assembly through the internal air gap (i.e. the air gap between the permanent magnet rotor assembly 3 and the conductor rotor assembly 4).
The permanent magnet coupling direct drive device provided by this embodiment has the following power transmission process in the starting process: the stator winding 22 is energized to generate a rotating magnetic field, and a current is induced on the permanent magnet rotor conductor bars 33, so that an electromagnetic force is generated to drive the rotation speed of the permanent magnet rotor assembly 3 to rapidly increase, and the rotation speed is switched to a synchronous rotation speed under the action of the permanent magnet field and the rotating magnetic field. Meanwhile, the conductor rotor conductor cuts the permanent magnetic field, and induces to generate current so as to generate electromagnetic torque, and the conductor rotor assembly 4 is driven to drive the load to start slowly.
The permanent magnet coupling direct drive device provided by this embodiment has the following power transmission process in the normal operation process: the stator winding 22 is energized with multi-phase alternating current to generate a rotating magnetic field, which interacts with the permanent magnetic field of the permanent magnets 32 on the permanent magnet rotor assembly 3, thereby driving the permanent magnet rotor assembly 3 to synchronously rotate at the same speed as the rotating magnetic field. There is slip between permanent magnet rotor subassembly 3 and conductor rotor subassembly 4, and the conductor rotor conductor cuts the permanent magnetic field to the induction produces the electric current, and then produces the electromagnetic force, drives the operation of conductor rotor subassembly 4, drives the load and rotates.
In the permanent magnet coupling direct-drive device provided by the embodiment, when the load is locked or the resistance is suddenly too large, the permanent magnet rotor assembly 3 still keeps running synchronously with the rotating magnetic field generated by the stator winding 22, and no eddy current loss is generated on the permanent magnet rotor assembly 3; eddy current losses are only generated on the conductor rotor assembly 4 and do not result in high temperature demagnetization of the permanent magnets 32 on the permanent magnet rotor assembly 3.
In the permanent magnet coupling direct-drive device provided by the embodiment, the excitation magnetic field is provided by the permanent magnet 32 during operation, the stator winding 22 is not required to provide excitation current, the efficiency and the power factor are high, meanwhile, the device can be designed to be used for directly driving a load to operate with high pole number, the device can also be used for keeping efficient operation during low-load operation, the buffer start can be realized, the start impact is reduced, and particularly, the device is used for starting a large-rotational inertia load; even in the locked rotor, the burning and demagnetization of the permanent magnet 32 can be avoided, and the reliability is high.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (10)
1. A permanent magnet coupling direct-drive device is characterized by comprising a machine shell, and a stator assembly, a permanent magnet rotor assembly, a conductor rotor assembly and an output shaft which are coaxially arranged in the machine shell from outside to inside in sequence;
the output shaft is rotationally connected with the shell;
the conductor rotor assembly is fixedly connected to the output shaft;
the stator assembly is fixedly connected with the shell and is used for communicating external multi-phase alternating current and generating a rotating magnetic field;
the permanent magnet rotor assembly is rotationally connected with the shell or the output shaft and is driven to rotate through the interaction of a permanent magnetic field and the rotating magnetic field;
the conductor rotor assembly cuts the rotating permanent magnetic field and generates torque, and the torque drives the conductor rotor assembly to rotate so as to drive the output shaft to rotate.
2. The permanent magnet coupling direct drive device according to claim 1, wherein the stator assembly comprises a stator core and stator windings, the stator core is fixedly connected with the machine shell, the stator windings are annularly and uniformly distributed on the inner side of the stator core, and the stator windings are used for being communicated with external multi-phase alternating current.
3. The permanent magnet coupling direct drive device according to claim 1, wherein the permanent magnet rotor assembly comprises a permanent magnet, a permanent magnet rotor core and permanent magnet rotor conductor bars, the permanent magnet rotor core is rotatably connected to the casing or the output shaft, the permanent magnet and the permanent magnet rotor conductor bars are respectively and uniformly distributed on the permanent magnet rotor core in an annular manner, the permanent magnet is located on the inner side of the permanent magnet rotor conductor bars, and the permanent magnet is used for generating the permanent magnetic field.
4. The permanent magnet coupling direct drive device according to claim 1, wherein the conductor rotor assembly comprises conductor rotor conductors and a conductor rotor core, the conductor rotor conductors are distributed on the periphery side of the conductor rotor core, the conductor rotor core is fixedly connected to the output shaft, and the conductor rotor conductors are used for cutting the rotating permanent magnet field.
5. The permanent magnet coupling direct drive device according to claim 1, wherein air gaps are distributed between the permanent magnet rotor assembly and the stator assembly and between the permanent magnet rotor assembly and the conductor rotor assembly respectively.
6. The permanent magnet coupling direct drive device according to claim 3, wherein magnetic isolation magnetic bridges are annularly distributed on the permanent magnet rotor core.
7. The permanent magnet coupling direct drive device according to claim 3, wherein permanent magnet rotor conductor rings are respectively arranged at two axial ends of the permanent magnet rotor assembly, and two axial ends of each permanent magnet rotor conductor bar are respectively connected with the corresponding permanent magnet rotor conductor rings and are matched with each other to form a squirrel-cage-shaped closed loop.
8. The permanent magnet coupling direct drive device according to claim 4, wherein the conductor rotor conductor is a metal cylinder, and the metal cylinder is sleeved on the conductor rotor core and connected with the conductor rotor core.
9. The permanent magnet coupling direct drive device according to claim 4, wherein the conductor rotor conductor comprises a plurality of conductor rotor conductor bars, the conductor rotor conductor bars are annularly and uniformly distributed on the periphery of the conductor rotor core, conductor rotor conductor rings are respectively arranged at two axial ends of the conductor rotor assembly, and two axial ends of each conductor rotor conductor bar are respectively connected with the corresponding conductor rotor conductor rings and are matched with each other to form a squirrel cage-shaped closed loop.
10. The permanent magnet coupling direct drive device according to claim 3, wherein the output shaft and the housing are rotatably connected through a bearing, two ends of the permanent magnet rotor core in the axial direction are respectively connected with a supporting cover, and the supporting covers are rotatably connected to the housing or the output shaft through bearings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010732104.7A CN111799981A (en) | 2020-07-27 | 2020-07-27 | Permanent magnet coupling direct-drive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010732104.7A CN111799981A (en) | 2020-07-27 | 2020-07-27 | Permanent magnet coupling direct-drive device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111799981A true CN111799981A (en) | 2020-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010732104.7A Pending CN111799981A (en) | 2020-07-27 | 2020-07-27 | Permanent magnet coupling direct-drive device |
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| Country | Link |
|---|---|
| CN (1) | CN111799981A (en) |
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2020
- 2020-07-27 CN CN202010732104.7A patent/CN111799981A/en active Pending
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