CN111799981A - A permanent magnet coupling direct drive device - Google Patents

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

A permanent magnet coupling direct drive device

technical field

The invention belongs to the technical field of permanent magnet drive, and in particular relates to a permanent magnet coupling direct drive device.

Background technique

The permanent magnet synchronous motor adopts permanent magnet excitation, which has the advantages of high power factor, high efficiency, and a wide range of high-efficiency operation, and can be designed to directly drive the load with a high number of poles to shorten the transmission chain. For the asynchronous starting permanent magnet synchronous motor, during the starting process, the starting cage on the permanent magnet rotor cuts the rotating magnetic field generated after the stator winding is energized, thereby generating an induced current on the starting cage, thereby generating torque and driving the permanent magnet rotor to run.

Asynchronous start-up permanent magnet synchronous motor has a short start-up time, which will cause the speed of the load to rapidly increase to the synchronous speed, with large acceleration and large start-up shock. When an asynchronous start permanent magnet synchronous motor drives a load with a large rotational inertia, the starting time required for the load to accelerate to the rated process is longer, the motor rotor will be in an asynchronous state for a long time, and the starting cage on the permanent magnet rotor will induce a lot of heat. , it is easy to cause the permanent magnets on the rotor to demagnetize and the motor windings to burn. At the same time, when the permanent magnet synchronous motor drives the load synchronously, once the load is locked or the load torque is too large, the motor will be out of step, and a large amount of heat will also be induced on the permanent magnet rotor, which is easy to cause permanent magnets. demagnetization.

In order to realize the buffer start of the permanent magnet synchronous motor running at the power frequency, it is mainly realized by adding electrical devices at the front end of the motor. In the prior art, there are direct start-up methods of permanent magnet synchronous motors for power frequency operation. The permanent magnet synchronous motor is buffered and started by using a frequency converter, and then the frequency converter is disconnected and the direct power frequency operation is performed; On the basis of this, the device for soft start of permanent magnet synchronous motor can be realized. However, all of the above methods require additional electronic components, which will not only increase the cost, but also reduce the system reliability.

The asynchronous induction motor generates an excitation magnetic field by induction on the rotor, and there is no permanent magnet inside the rotor, so there is no problem of high temperature demagnetization of the permanent magnet. When starting a load with a large inertia moment, the asynchronous induction motor will also be in a high-slip operation and load acceleration state for a long time, resulting in a large stator winding current and excessive heat, so that the load with a large moment of inertia cannot be directly started. At the same time asynchronous induction The motor also has the problem that the motor is easy to burn when the rotor is locked. At the same time, it is difficult to design an asynchronous induction motor with a high number of poles to directly drive a low-speed load, and at a low load rate, the efficiency and power factor of the asynchronous induction motor will decrease rapidly.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a permanent magnet coupling direct drive device, which combines the advantages of the permanent magnet synchronous motor and the asynchronous induction motor, so as to solve the problem that the permanent magnet synchronous motor has a large starting impact and the asynchronous induction motor is difficult to directly start the large moment of inertia in the prior art. load problem.

The technical scheme of the present invention is:

A permanent magnet coupling direct drive device is characterized in that it comprises a casing and a stator assembly, a permanent magnet rotor assembly, a conductor rotor assembly and an output shaft which are coaxially arranged in sequence from outside to inside in the casing;

the output shaft is rotatably connected to the casing;

the conductor rotor assembly is fastened to the output shaft;

The stator assembly is fixedly connected with the casing, and the stator assembly is used for connecting external multi-phase alternating current and generating a rotating magnetic field;

The permanent magnet rotor assembly is rotatably connected to the casing or the output shaft, and the permanent magnet rotor assembly drives the permanent magnet rotor assembly to rotate through the interaction between the permanent magnet field and the rotating magnetic field;

The conductor rotor assembly cuts the rotating permanent magnetic field and generates a 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 iron core and a stator winding, the stator iron core is fixedly connected to the casing, and the stator windings are annularly distributed on the inner side of the stator iron core, The stator winding is used to communicate with 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 a permanent magnet rotor conductor bar, and the permanent magnet rotor core is rotatably connected to the casing or the output shaft , the permanent magnets and the permanent magnet rotor conductor bars are annularly distributed on the permanent magnet rotor core, the permanent magnets are located inside the permanent magnet rotor conductor bars, and the permanent magnets are used to generate the permanent magnetic field.

Preferably, in an embodiment of the present invention, the conductor rotor assembly includes a conductor rotor conductor and a conductor rotor iron core, the conductor rotor conductors are distributed outside the conductor rotor iron core, and the conductor rotor iron core is fixed to the The output shaft, the conductor rotor conductor is used for cutting the rotating permanent magnetic field.

Preferably, in an embodiment of the present invention, air gaps are distributed between the permanent magnet rotor assembly and the stator assembly and the conductor rotor assembly, respectively.

Preferably, in an embodiment of the present invention, a magnetic isolation magnetic bridge is annularly distributed on the iron core of the permanent magnet rotor.

Preferably, in an embodiment of the present invention, both ends of the permanent magnet rotor assembly in the axial direction are respectively provided with permanent magnet rotor conductor rings, and the axial ends of each of the permanent magnet rotor conductor bars are respectively connected with the corresponding The permanent magnet rotor conductors are connected in rings and cooperate to form a squirrel-cage 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 iron core and connected to the conductor rotor iron 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 distributed on the circumference side of the conductor rotor core, and the conductor rotor assembly is axially Conductor rotor conductor rings are respectively provided at both ends of the upper conductor rotor, and both ends of each conductor rotor conductor bar in the axial direction are respectively connected with the corresponding conductor rotor conductor rings, and cooperate to form a squirrel-cage closed loop.

Preferably, in an embodiment of the present invention, the output shaft and the casing are rotatably connected through bearings, and two ends of the permanent magnet rotor core in the axial direction are respectively connected with support covers, and the support covers rotate through the bearings connected to the casing or the output shaft.

Compared with the prior art, the present invention has the following advantages and positive effects due to the adoption of the above technical solutions:

(1) In the permanent magnet coupling direct drive device provided by the present invention, the rotating magnetic field generated after the stator winding on the stator assembly is connected to the external multi-phase alternating current, the rotating magnetic field interacts with the permanent magnet field of the permanent magnet rotor assembly, and drives the permanent magnet rotor assembly to synchronize Rotation; the rotating permanent magnet rotor assembly and the stationary conductor rotor assembly rotate relative to each other, so that the conductor rotor assembly cuts the rotating permanent magnet field, so that the conductor rotor assembly generates electromagnetic force to drive the conductor rotor assembly and the load to rotate. When the device starts, the speed of the permanent magnet rotor assembly rapidly increases to the synchronous speed with the rotating magnetic field, and the conductor rotor assembly and the load increase slowly, which can effectively alleviate the start-up impact. During inertia load, the stator winding current will not be in a high current state for a long time, which avoids the overheating and burning of the stator winding. Therefore, the problems in the prior art that the permanent magnet synchronous motor has a large starting impact and the asynchronous induction motor is difficult to directly start the large rotational inertia load is solved.

(2) In the permanent magnet coupling direct drive device provided by the embodiment of the present invention, the excitation magnetic field is provided by permanent magnets during operation, and there is no need for stator windings to provide excitation current, and the power factor is high. State can also be kept running efficiently.

(3) In the permanent magnet coupling direct drive device provided by the embodiment of the present invention, when the load connected to the conductor rotor assembly is locked or the resistance is suddenly too large, the permanent magnet rotor assembly still keeps running synchronously with the rotating magnetic field generated by the stator winding , eddy current loss will not be generated on the permanent magnet rotor assembly, only the eddy current loss will be generated on the conductor rotor assembly, and will not cause the permanent magnet on the permanent magnet rotor assembly to be burned at high temperature.

(4) In the permanent magnet coupling direct drive device provided by the embodiment of the present invention, the torque transmitted between the permanent magnet rotor assembly and the conductor rotor assembly has an extreme value, and when the load resistance connected to 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, and the stator winding current is prevented from being burnt due to excessive current, and the torque protection function is realized.

(5) In the permanent magnet coupling direct drive device provided by the embodiment of the present invention, a magnetic isolation magnetic bridge is arranged on the core of the permanent magnet rotor, so that the main magnetic flux generated by the permanent magnet passes through the external air gap (that is, the permanent magnet rotor assembly and the stator assembly). The air gap between the permanent magnet rotor assembly and the conductor rotor assembly is interlinked with the stator windings, and also with the conductor rotor conductors on the conductor rotor assembly through the internal air gap (ie, the air gap between the permanent magnet rotor assembly and the conductor rotor assembly).

Description of drawings

The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is a schematic cross-sectional front view of a permanent magnet coupling direct drive device of the present invention;

FIG. 2 is a schematic cross-sectional side view of a permanent magnet coupling direct drive device according to the present invention;

FIG. 3 is an enlarged schematic diagram of a region A of a permanent magnet coupling direct drive device of the present invention;

FIG. 4 is an enlarged schematic diagram of the B region of a permanent magnet coupling direct drive device of the present invention.

Description of reference numbers:

1: casing; 2: stator assembly; 21: stator core; 22: stator winding; 3: permanent magnet rotor assembly; 31: permanent magnet rotor core; 32: permanent magnet; 33: permanent magnet rotor conductor bar; 34 : Permanent magnet rotor conductor ring; 4: Conductor rotor assembly; 41: Conductor rotor conductor bar; 42: Conductor rotor core; 43: Conductor rotor conductor ring; 5: Output shaft; 6: Magnetic isolation bridge; 7: Support cover ; 8: Bearing.

Detailed ways

The following describes a permanent magnet coupling direct drive device proposed by the present invention in further detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become apparent from the following description and claims. It should be noted that, the accompanying drawings are all in a very simplified form and use imprecise ratios, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention.

Also, expressions such as "first," "second," etc. are only used for the purpose of distinguishing between multiple configurations, rather than limiting the order among the configurations or other features.

In addition, the expression "comprising" an element is an "open-ended" expression that merely refers to the presence of corresponding components and should not be interpreted as excluding additional components.

1 to 4 , the present embodiment provides a permanent magnet coupling direct drive device, including a casing 1 and a stator assembly 2, a permanent magnet rotor assembly 3, a conductor and a stator assembly 2, a permanent magnet rotor assembly 3, and a coaxially arranged in order from outside to inside inside the casing 1. Rotor assembly 4 and output shaft 5. The output shaft 5 is rotatably connected to the casing 1 , and the conductor rotor assembly 4 is fixedly connected to the output shaft 5 . The stator assembly 2 is fixedly connected to the casing 1 , and the stator assembly 2 is used for connecting external multi-phase alternating current and generating a rotating magnetic field. The permanent magnet rotor assembly 3 is rotatably connected with the casing 1 or the output shaft 5, and the permanent magnet rotor assembly 3 drives the permanent magnet rotor assembly 3 to rotate through the interaction between the permanent magnet field and the 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.

The rotating magnetic field generated after the stator winding 22 on the stator assembly 2 is connected to the external multi-phase alternating current, the rotating magnetic field interacts with the permanent magnetic field of the permanent magnet rotor assembly 3, and drives the permanent magnet rotor assembly 3 to rotate synchronously; the rotating permanent magnet rotor assembly 3 and The stationary conductor rotor assembly 4 rotates relatively, so that the conductor rotor assembly 4 cuts the rotating permanent magnetic field, so that the conductor rotor assembly 4 generates electromagnetic force to drive the conductor rotor assembly 4 and the load to rotate. When the device starts, the speed of the permanent magnet rotor assembly 3 increases rapidly to the synchronous speed with the rotating magnetic field, and the conductor rotor assembly 4 and the load increase slowly, which can effectively alleviate the start-up impact. At the same time, the permanent magnet coupling direct drive device of this embodiment is When starting a load with a large moment of inertia, the stator winding current will not be in a high current state for a long time, avoiding the overheating and burning of the stator winding.

The structure of this embodiment will now be described.

The stator assembly 2 includes a stator winding 22 and a stator iron core 21 , and the stator iron core 21 is fixedly connected to the casing 1 by positioning and embedding. Specifically, in this embodiment, a positioning groove can be set on the outer side wall of the stator core 21, and a positioning rib matching the positioning groove can be set on the inner surface of the casing 1. By inserting the positioning rib into the corresponding positioning groove The slot is used to realize the fixed connection between the stator iron core 21 and the casing 1; of course, in other embodiments, other ways may be used to connect the stator iron core 21 and the casing 1, which is not limited here. The stator iron core 21 is a cylinder with a circular cross section. The inner side of the stator iron core 21 has several first accommodating slots along the axial direction for installing the stator windings 22, and the plurality of first accommodating slots are annularly distributed on the stator iron. The inner side of the core 21, therefore, the stator windings 22 are also uniformly distributed in the inner side of the stator iron core 21. A rotating magnetic field is generated when a multi-phase alternating current is passed through the stator winding 22 .

The permanent magnet rotor assembly 3 includes permanent magnets 32 , permanent magnet rotor cores 31 and permanent magnet rotor conductor bars 33 . The permanent magnet rotor iron core 31 is rotatably connected to the casing 1 or the output shaft 5. Specifically, in this embodiment, both ends of the permanent magnet rotor iron core 31 in the axial direction are respectively connected with support covers 7, and the support covers 7 pass through The bearing 8 is rotatably connected with the output shaft 5 . A plurality of second accommodating grooves are uniformly distributed on the outer part of the permanent magnet rotor core 31, and the length direction of the second accommodating grooves is the axial direction, which is used for installing the permanent magnet rotor conductor bars 33. Therefore, the permanent magnet rotor The rotor conductor bars 33 are uniformly distributed in the outer portion of the permanent magnet rotor core 31 . The two ends of the permanent magnet rotor assembly 3 are respectively connected by the permanent magnet rotor conductor rings 34 to form a closed loop. Specifically, a permanent magnet rotor conductor ring 34 may be provided at both ends of the permanent magnet rotor assembly 3 in the axial direction, and the two ends of each permanent magnet rotor conductor bar 33 in the axial direction are respectively connected with the permanent magnet rotor corresponding to the same end. The conductor loops 34 are connected and cooperate to form a squirrel-cage closed loop.

A plurality of third accommodating grooves are uniformly opened in a ring shape on the permanent magnet rotor core 31 , and the length direction of the third accommodating groove is the axial direction, which is used for installing the permanent magnets 32 , so the permanent magnets 32 are also commutated and evenly distributed in the permanent magnets. on the magnetic rotor core 31 . At the same time the annularly arranged permanent magnets 32 are located inside the annularly arranged permanent magnet rotor conductor bars 33 . The permanent magnets 32 generate a permanent magnetic field.

When the permanent magnet coupling direct drive device provided in 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 forms a closed loop through the permanent magnet rotor conductor rings 34 at both ends, so that the The permanent magnet rotor conductor bar 33 generates electromagnetic torque, which drives the permanent magnet rotor assembly 3 to start up quickly. When the permanent magnet rotor assembly 3 cuts into the synchronous rotation speed, the permanent magnet rotor conductor bars 33 no longer generate induced current. At this time, the permanent magnet field generated by the permanent magnet 32 interacts with the rotating magnetic field generated by the stator winding 22, and an electromagnetic field is generated on the permanent magnet 32. torque, thereby driving the permanent magnet rotor assembly 3 to run.

Conductor rotor assembly 4 includes conductor rotor conductors and conductor rotor core 42 . The conductor rotor iron core 42 is a cylinder with a circular cross section, and the inner side of the conductor rotor iron core 42 is in interference fit with the output shaft 5 to be fixedly connected. The conductor rotor conductors are uniformly distributed on the conductor rotor core 42 . The conductor rotor conductor can be a metal cylinder, which is sleeved and connected to the conductor rotor iron core 42 and connected to the conductor rotor iron core 42; Both ends are connected by conductor rotor conductor rings 43; or the conductor rotor conductors are of other forms, which are not limited here. Specifically, in this embodiment, the conductor rotor conductors are a plurality of conductor rotor conductor bars 41 . A plurality of fourth accommodating grooves are uniformly arranged in the outer part of the conductor rotor iron core 42, and the length direction of the fourth accommodating groove is the axial direction, which is used for installing the conductor rotor conductor bars 41, so the conductor rotor conductor bars 41 are all It is arranged on the outer portion of the conductor rotor core 42 . The two ends of the conductor rotor conductors are respectively connected by the conductor rotor conductor rings 43 to form a closed loop. Specifically, a conductor rotor conductor ring 43 may be provided at both ends of the conductor rotor assembly 4 in the axial direction respectively, and the two ends of each conductor rotor conductor bar 41 in the axial direction are respectively connected with the conductor rotor conductor rings 43 corresponding to the same end, and Cooperate to form a squirrel-cage closed loop.

There are gaps between the permanent magnet rotor assembly 3 and the stator assembly 2 and the conductor rotor assembly 4, respectively. The air gap between the permanent magnet rotor assembly 3 and the stator assembly 2 is called the outer air gap; the air gap between the permanent magnet rotor assembly 3 and the conductor rotor assembly 4 is called the inner air gap. The existence of the outer air gap and the inner air gap allows the permanent magnet rotor conductor assembly to rotate relative to the stator assembly 2 and the conductor rotor assembly 4 .

The output shaft 5 and the casing 1 can be rotatably connected through the bearing 8, the output shaft 5 is used to connect the 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 casing 1 (through the output shaft 5 ) and the permanent magnet rotor assembly 3 . During start-up or operation, the conductor rotor conductor bar 41 cuts the permanent magnetic field generated by the permanent magnet 32 and generates an induced current, and a current loop is formed through the conductor rotor conductor rings 43 at both ends, and an electromagnetic torque is generated on the conductor rotor conductor bar 41 to drive the The conductor rotor assembly 4 rotates.

Wherein, both the permanent magnet rotor conductor bars 33 and the conductor rotor conductor bars 41 can be metal conductor bars.

Preferably, a magnetic isolation magnetic bridge 6 is provided on the permanent magnet rotor iron core 31, so that the main magnetic flux generated by the permanent magnet 32 passes through the external air gap (ie the air gap between the permanent magnet rotor assembly 3 and the stator assembly 2). It is interlinked with the stator windings 22, while also interlinked with the conductor rotor conductor bars 41 on the conductor rotor assembly through the internal air gap (ie the air gap between the permanent magnet rotor assembly 3 and the conductor rotor assembly 4).

In the permanent magnet coupling direct drive device provided in this embodiment, the power transmission process during the startup process is as follows: 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 to generate electromagnetic force to drive the permanent magnet rotor assembly. The speed of 3 increases rapidly and switches to synchronous speed under the force of the permanent magnetic field and the rotating magnetic field. At the same time, the conductor rotor conductor cuts the permanent magnetic field, induces current to generate electromagnetic torque, and drives the conductor rotor assembly 4 to drive the load to start slowly.

In the permanent magnet coupling direct drive device provided in this embodiment, the power transmission process during normal operation is as follows: the stator winding 22 generates a rotating magnetic field through multi-phase alternating current, and interacts with the permanent magnet field of the permanent magnet 32 on the permanent magnet rotor assembly 3, thereby The permanent magnet rotor assembly 3 is driven to run synchronously at the same rotational speed as the rotating magnetic field. There is a slip between the permanent magnet rotor assembly 3 and the conductor rotor assembly 4, and the conductor rotor conductor cuts the permanent magnet field, thereby inducing a current to generate an electromagnetic force, driving the conductor rotor assembly 4 to run, and driving the load to rotate.

In the permanent magnet coupling direct drive device provided in this 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 the permanent magnet rotor assembly 3 does not run synchronously. Eddy current loss will be generated; eddy current loss is only generated on the conductor rotor assembly 4 and will not cause high temperature demagnetization of the permanent magnets 32 on the permanent magnet rotor assembly 3 .

In the permanent magnet coupling direct drive device provided in this embodiment, the excitation magnetic field is provided by the permanent magnet 32 during operation, and the stator winding 22 does not need to provide the excitation current, so the efficiency and power factor are high, and at the same time, it can be designed to directly drive the load with a high number of poles, with a low load. The operation can also maintain high-efficiency operation, and can realize the buffer start, reduce the start-up shock, especially for the start of the large rotational inertia load; even when the rotor is locked, it can avoid burning and demagnetization of the permanent magnet 32, and the reliability is high.

The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and the technical equivalents thereof, they still fall within the protection scope of the present invention.

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.

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