Dual-rotor permanent magnet speed-regulating motor

Abstract

The utility model relates to double rotor permanent magnet motor technical field discloses a kind of double rotor permanent magnet speed-regulating motor, comprising: installation base, it is housing structure, installation cavity is formed in installation base interior, and motor winding stator is fixedly installed on the inner side wall of installation cavity;Output shaft, it is axially through installation base, and installation base both ends are supported and installed on output shaft by outer bearing, and installation base is rotatably supported and installed on output shaft by outer bearing;Double permanent magnet rotor, coaxially installed in motor winding stator inner side, and double permanent magnet rotor both ends are supported and installed on output shaft by first inner bearing and second inner bearing respectively, and inductive winding rotor is installed in the sleeve between double permanent magnet rotor and output shaft. By installing outer bearing, first inner bearing and second inner bearing on output shaft, same model bearing piece can be selected in selection, so that the shaft diameter required to be carried by inner bearing, the design power of double rotor permanent magnet speed-regulating motor can be improved.

Description

Technical Field

[0001] This utility model relates to the field of dual-rotor permanent magnet motor technology, specifically to a dual-rotor permanent magnet speed-regulating motor. Background Technology

[0002] Permanent magnet speed-regulating motors achieve efficient energy transfer through permanent magnet coupling, offering advantages such as speed regulation, energy saving, and soft start under heavy loads, making them particularly suitable for applications requiring continuous operation. In permanent magnet speed-regulating motors, bearings are critical supporting components, and their lubrication condition directly affects the equipment's lifespan and operational reliability.

[0003] To reduce the energy consumption of permanent magnet speed-regulating motors, existing technologies employ dual-rotor permanent magnet speed-regulating motors. These motors utilize inner and outer permanent magnet rotors and winding rotors to feed all slip power back to the power grid or reuse it within the motor structure itself. In existing dual-rotor permanent magnet speed-regulating motors, the inner rotor is installed inside the motor housing. To facilitate lubrication of the rotating bearing at the end of the inner rotor without stopping the machine, the bearing support is fitted between the housing and the inner rotor's support frame. Because the output shaft needs to be loosely fitted inside the support frame, the inner rotor's bearing is relatively large, resulting in a limitation on the bearing's linear speed during high-power operation of the electromagnetic coupling motor. Utility Model Content

[0004] In view of this, the present invention provides a dual-rotor permanent magnet speed-regulating motor to solve the problem that the peak power of the dual-rotor permanent magnet speed-regulating motor is limited by the bearing of the inner rotor.

[0005] In a first aspect, this utility model provides a dual-rotor permanent magnet speed-regulating motor, comprising: The mounting base is a shell structure with a mounting cavity formed inside. The motor winding stator is fixedly mounted on the inner wall of the mounting cavity. The output shaft passes through the mounting base axially. The mounting base is supported on the output shaft at both ends by external bearings. The mounting base is rotatably supported on the output shaft by external bearings. The dual permanent magnet rotor is coaxially mounted inside the motor winding stator. Both ends of the dual permanent magnet rotor are supported and mounted on the output shaft by the first inner bearing and the second inner bearing, respectively. An induction winding rotor is sleeved between the dual permanent magnet rotor and the output shaft. The output shaft has a lubrication channel along its axial direction, and a lubricant distributor is slidably installed in the lubrication channel. By moving the lubricant distributor axially, lubricant is selectively delivered to the first inner bearing or the second inner bearing.

[0006] When the dual-rotor permanent magnet speed-regulating motor is operating, an alternating current is applied to the stator windings, generating a rotating magnetic field. The permanent magnet magnetic field of the outer magnets of the dual permanent magnet rotors interacts with the rotating magnetic field of the stator windings, transmitting torque and causing the stator windings to drive the dual permanent magnet rotors to rotate at synchronous speed. Simultaneously, the induction winding rotor cuts the permanent magnet magnetic field of the inner magnets of the dual permanent magnet rotors, generating an induced electromotive force (EMF) in the induction winding rotor. The induced magnetic field of the induction winding rotor interacts with the permanent magnet magnetic field of the inner magnets of the dual permanent magnet rotors to transmit torque, causing the induction winding rotor to rotate and simultaneously drive the output shaft to rotate. The output speed of the output shaft can be controlled by adjusting the induced current in the induction winding. During the operation of the dual-rotor permanent magnet speed-regulating motor, a lubricant distributor axially moved within the lubrication channel of the output shaft can selectively connect the lubrication path to either the first or second inner bearing, thus achieving directional lubrication of the designated bearings without stopping the motor. By mounting the outer bearing, the first inner bearing, and the second inner bearing on the output shaft, the same type of bearing components can be selected for the outer bearing, the first inner bearing, and the second inner bearing. This reduces the shaft diameter required for the first inner bearing and the second inner bearing to bear the load, thereby overcoming the limitation of bearing linear speed when the dual-rotor permanent magnet speed-regulating motor operates at high power and greatly improving the design power of the dual-rotor permanent magnet speed-regulating motor.

[0007] In one optional embodiment, sleeve flanges are installed at both ends of the dual permanent magnet rotor, the outer rings of the first inner bearing and the second inner bearing are respectively interference-fitted with the corresponding sleeve flanges, and the inner rings of the first inner bearing and the second inner bearing are both interference-fitted with the output shaft.

[0008] The first and second inner bearings are connected to the two ends of the dual permanent magnet rotor via sleeve flanges, respectively, to achieve stable installation and synchronous rotation of the dual permanent magnet rotor on the output shaft. This ensures the alignment accuracy and connection reliability between the dual permanent magnet rotor and the output shaft, reduces vibration and noise during operation, and improves the bearing capacity and service life.

[0009] In one optional embodiment, the dual permanent magnet rotor includes a rotor carrier, which is coaxially mounted inside the motor winding stator. An outer permanent magnet is fixedly mounted on the outer side of the rotor carrier, and the outer permanent magnet is arranged correspondingly to the motor winding stator to form a first magnetic coupling pair. An inner permanent magnet is fixedly mounted on the inner side of the rotor carrier, and the inner permanent magnet is arranged correspondingly to the induction winding rotor to form a second magnetic coupling pair.

[0010] When the motor stator windings are energized, they generate a magnetic field, forming a first magnetic coupling pair with the outer permanent magnet, driving the dual permanent magnet rotor to rotate. Simultaneously, the inner permanent magnet forms a second magnetic coupling pair with the induction winding rotor, cutting magnetic field lines to generate an induced current, thereby controlling the speed of the induction winding rotor. Through this two-stage magnetic coupling structure, the motor achieves efficient energy transfer and speed regulation, improving its operating efficiency and power factor, and meeting the speed adjustment requirements under different operating conditions.

[0011] In one optional embodiment, an inner bearing outer cover and an inner bearing inner cover are fixedly installed on the sleeve flange. The inner bearing outer cover and the inner bearing inner cover together form an inner bearing mounting cavity. The first inner bearing and the second inner bearing are respectively installed in the two bearing mounting cavities, and both bearing mounting cavities are connected to the lubrication channel.

[0012] The inner bearing outer cover and inner bearing inner cover combine to form a sealed inner bearing mounting cavity, encapsulating the first and second inner bearings respectively. Lubricant is injected into the mounting cavity through lubrication channels to achieve bearing lubrication. The sealed mounting cavity structure effectively prevents lubricant leakage and the entry of external impurities, ensuring that the bearings are always in a good lubrication state, achieving effective lubrication and cooling of the corresponding bearings.

[0013] In one alternative embodiment, a transition sleeve is installed between the induction winding rotor and the output shaft. The transition sleeve acts as a connector to fix the induction winding rotor on the output shaft.

[0014] In one alternative embodiment, a slip ring is fixedly provided at the tail end of the output shaft, and an output cable is connected to the slip ring. The output cable extends to the inner side of the dual permanent magnet rotor and connects to the induction winding rotor.

[0015] The slip ring rotates with the output shaft. One end of the cable is connected to the slip ring, and the other end is connected to the induction winding rotor, drawing the electrical energy generated by the induction winding rotor to the external circuit. This realizes the transfer of electrical energy between the induction winding rotor and the external circuit, allowing the slip power to be drawn out through the slip ring and effectively utilized, thus improving the energy recovery efficiency of the motor.

[0016] In one alternative embodiment, the lead cable extends along the lubrication channel and passes through the output shaft to extend to the inner side of the dual permanent magnet rotor. This protects the lead cable from external interference and damage, reduces wear on the lead cable, saves internal space in the mounting base cavity, avoids interference between the lead cable and rotating parts, and improves the compactness and reliability of the motor's internal structure.

[0017] In one alternative embodiment, a protective cover is fixedly mounted on one end of the mounting base, and a slip ring is installed inside the protective cover.

[0018] The protective cover provides effective physical protection for the slip ring, preventing external factors such as dust and moisture from affecting the slip ring's operation, thereby improving the slip ring's service life and operational reliability.

[0019] In one alternative embodiment, a carbon brush is installed inside the protective cover, the carbon brush is slidably conductively connected to the slip ring, and the carbon brush is connected to an external power supply device.

[0020] The carbon brush is installed inside the protective cover and maintains sliding contact with the slip ring. The sliding contact between the carbon brush and the slip ring ensures stable power transmission between the rotating and stationary parts, and ensures the continuity of the current signal between the induction winding rotor and the external circuit.

[0021] In one optional embodiment, a guide member is installed on the protective cover, and a guide groove is provided on the guide member. A guide post is provided on the lubricant distributor, and the lubricant distributor passes through the protective cover. The guide post and the guide groove are slidably engaged, and the guide groove extends along the axial direction of the output shaft.

[0022] The guide component is fixed to the protective cover, and its guide groove cooperates with the guide post on the lubricant distributor. When the lubricant distributor moves axially along the output shaft, the guide post slides within the guide groove, guiding the movement direction of the lubricant distributor. The guide groove guides the movement distance and position of the lubricant distributor, ensuring the stability of the lubricant distributor during axial movement and achieving control of the lubrication position. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a dual-rotor permanent magnet speed-regulating motor provided in an embodiment of the present invention.

[0025] Figure 2 A schematic diagram of the permanent magnet motor output shaft assembly in the oil-filled state, provided for an embodiment of this utility model.

[0026] Figure 3 This is a schematic diagram of the permanent magnet motor output shaft assembly provided in another oil-filled state according to an embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram of the structure of the external oil pipe provided in an embodiment of the present utility model.

[0028] Figure 5This is a schematic diagram of the structure of the inner oil pipe provided in an embodiment of the present utility model.

[0029] Figure 6 This is a schematic diagram of the structure of the shaft body provided in an embodiment of the present utility model.

[0030] Figure 7 A side sectional view of the shaft body provided in an embodiment of this utility model.

[0031] Figure 8 This is a side sectional view of the shaft body provided in an embodiment of the present invention from another angle.

[0032] Figure 9 A schematic diagram of the structure of the first isolation pin provided in an embodiment of this utility model.

[0033] Figure 10 This is a schematic diagram of the rotary oiler provided in an embodiment of the present invention.

[0034] Figure 11 This is a schematic diagram of the structure of the elastic guide sheet provided in an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached drawings: 1. Rotary oil injector; 111. Oil nozzle; 112. Rotary oil injector housing; 113. Sealing ring; 114. Guide post; 115. Oil injection bearing; 116. Bearing retainer; 2. Outer oil pipe; 211. Oil pipe sealing ring; 2111. Limiting groove; 2112. Cable passage hole; 2113. Bolt hole; 212. Cable threading fixing plate; 3. Inner oil pipe; 3111. Oil passage hole; 3112. Limiting pin; 4. Lead-out cable; 5. Shaft body 51. First plug; 52. First isolation pin; 5211. Through hole; 53. Second plug; 54. Second isolation pin; 5111. Front center hole; 5112. First oil injection hole; 5113. First pin hole; 5114. Transition hole; 5115. Second pin hole; 5116. Cable hole; 5117. Second oil injection hole; 5118. Rear center hole; 5119. Positioning step; 6. Winding rotor transition sleeve; 7. First inner bearing; 8. Second inner bearing; 9. Outer bearing; 10. Mounting base; 11. Inner cover of bearing housing; 12. Outer cover of inner bearing; 13. Sleeve flange; 14. Inner cover of inner bearing; 15. Motor winding stator; 16. Inner permanent magnet; 17. Rotor carrier; 18. Outer permanent magnet; 19. Induction winding rotor; 20. Permanent magnet rotor; 21. Slip ring; 22. Carbon brush; 23. Protective cover; 24. Elastic guide plate; 241. Guide groove. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] The following is combined with Figures 1 to 11 The following describes embodiments of the present invention.

[0038] According to an embodiment of the present invention, a dual-rotor permanent magnet speed-regulating motor is provided, including a mounting base 10, an output shaft, and dual permanent magnet rotors 20.

[0039] The mounting base 10 constitutes the main support housing of the motor, and a cylindrical mounting cavity is machined inside it. An annular motor winding stator 15 is fixedly mounted on the inner wall of this mounting cavity. The output shaft, as the power output component of the motor, extends through the entire mounting base 10 along the motor's axial direction. Both ends of the mounting base 10 are supported by external bearings 9 and mounted on the output shaft, allowing the mounting base 10 to remain stationary relative to the output shaft, while the output shaft can rotate freely under the support of the external bearings 9.

[0040] The dual permanent magnet rotor 20, as a key magnetic field coupling component of the motor, is coaxially mounted on the radially inner side of the motor winding stator 15. Both ends of the dual permanent magnet rotor 20 are supported and mounted on the output shaft via a first inner bearing 7 and a second inner bearing 8, respectively, allowing the dual permanent magnet rotor 20 to rotate relative to the output shaft while maintaining a coaxial relationship with it. An induction winding rotor 19 is also coaxially mounted within the annular space between the dual permanent magnet rotor 20 and the output shaft. The output shaft also features a central hole extending along its axial direction as a lubrication channel, within which an oil supply pipe, serving as a lubricant distributor, is slidably mounted. By controlling the axial movement of the lubricant distributor within the lubrication channel, lubricant can be selectively delivered to either the first inner bearing 7 or the second inner bearing 8 supporting the dual permanent magnet rotor 20.

[0041] The working principle of the dual-rotor permanent magnet speed-regulating motor is as follows: When alternating current is applied to the stator 15 of the motor windings, a rotating magnetic field is generated. The permanent magnet magnetic field generated by the permanent magnet assembly arranged on the outer side of the dual permanent magnet rotor 20 interacts with the rotating magnetic field of the stator 15 of the motor windings, generating electromagnetic torque, thereby driving the dual permanent magnet rotor 20 to rotate at synchronous speed. Simultaneously with the rotation of the dual permanent magnet rotor 20, the permanent magnet magnetic field generated by the permanent magnet assembly arranged on its inner side cuts the conductors in the induction winding rotor 19, generating an induced electromotive force (EMF) in the induction winding rotor 19 according to the law of electromagnetic induction. This induced EMF generates an induced current in the closed loop, thus forming an induced magnetic field. The induced magnetic field of the induction winding rotor 19 interacts with the permanent magnet magnetic field of the permanent magnets on the inner side of the dual permanent magnet rotor 20, generating torque, driving the induction winding rotor 19 to rotate, and consequently, driving the output shaft connected to it to rotate. By adjusting the magnitude or phase of the induced current in the induction winding circuit through an external control system, the output speed of the output shaft can be precisely controlled, realizing the speed regulation function of the motor.

[0042] During continuous operation of the dual-rotor permanent magnet speed-regulating motor, the lubrication system operates simultaneously. By axially moving the lubricant distributor located in the lubrication channel of the output shaft, the flow path of the lubricant can be changed, selectively connecting it to the lubrication branch leading to the first inner bearing 7 or the second inner bearing 8, thereby achieving directional lubrication of the designated first inner bearing 7 or second inner bearing 8 without stopping the motor.

[0043] By directly mounting the outer bearings 9 supporting the mounting base 10, and the first inner bearing 7 and the second inner bearing 8 supporting the dual permanent magnet rotor 20 onto the output shaft, a unified bearing support system is constructed. This allows the outer bearings 9, the first inner bearing 7, and the second inner bearing 8 to be selected using bearing components of the same or similar specifications. Furthermore, the shared support of the first inner bearing 7, the second inner bearing 8, and the outer bearing 9 on the output shaft reduces the shaft diameter of the rotating components supported by the first inner bearings 7 and 8. The linear velocity of the bearing is positively correlated with the product of the shaft diameter and the rotational speed; at a constant rotational speed, reducing the shaft diameter directly reduces the linear velocity of the bearing. This enables the dual-rotor permanent magnet speed-regulating motor to effectively overcome the technical bottleneck caused by the limitation of bearing linear velocity when developing towards higher power, thereby improving the maximum power capacity and power density of the dual-rotor permanent magnet speed-regulating motor.

[0044] The core improvement of this embodiment lies in transferring the support point of the dual permanent magnet rotor 20 from the traditional stationary base to the rotating output shaft. Furthermore, a selectively distributable lubrication system is integrated within the output shaft. This integrated design, combining the transfer of the bearing support point with the built-in distributable lubrication, not only directly solves the problem of bearing linear speed limitation under high power by reducing the inner bearing shaft diameter, but also solves the problem of non-stop lubrication caused by the new support structure through the built-in controllable lubrication system.

[0045] In one embodiment, sleeve flanges 13 are installed at both ends of the dual permanent magnet rotor 20. The sleeve flanges 13 and the ends of the dual permanent magnet rotor 20 can be integrally formed or fixedly connected by welding, bolting, or other processes. The outer rings of the first inner bearing 7 and the second inner bearing 8 are respectively connected to the corresponding sleeve flanges 13 by an interference fit. Simultaneously, the inner rings of both the first inner bearing 7 and the second inner bearing 8 are connected to the output shaft by an interference fit. By reliably connecting the first inner bearing 7 and the second inner bearing 8 to the two ends of the dual permanent magnet rotor 20 through the sleeve flanges 13, stable installation and synchronous rotation of the dual permanent magnet rotor 20 on the output shaft are achieved. This ensures accurate alignment between the dual permanent magnet rotor 20 and the output shaft, improves connection reliability, effectively reduces vibration and noise generated during equipment operation, and enhances the bearing's load-bearing capacity.

[0046] In one embodiment, the dual permanent magnet rotor 20 includes a rotor carrier 17 made of a high-permeability material, coaxially mounted radially inside the motor winding stator 15. An outer permanent magnet 18 is fixedly mounted on the outer surface of the rotor carrier 17 by means of bonding, embedding, or bolting. The outer permanent magnet 18 and the motor winding stator 15 are radially corresponding to each other, forming a first magnetic coupling pair. An inner permanent magnet 16 is fixedly mounted on the inner surface of the rotor carrier 17. The inner permanent magnet 16 and the induction winding rotor 19 are radially corresponding to each other, forming a second magnetic coupling pair.

[0047] When alternating current is applied to the stator 15 of the motor windings, a rotating magnetic field is generated. This magnetic field interacts with the first magnetic coupling pair formed by the outer permanent magnet 18, producing torque to drive the dual permanent magnet rotor 20 to rotate. Simultaneously, in the second magnetic coupling pair formed by the rotating inner permanent magnet 16 and the induction winding rotor 19, the induction winding rotor 19 cuts magnetic field lines to generate induced electromotive force and induced current. The speed of the induction winding rotor 19 can be controlled by adjusting this induced current through an external circuit. This two-stage magnetic coupling structure enables efficient energy transfer and speed regulation of the motor, improving its operating efficiency and power factor, and meeting the speed regulation requirements under different operating conditions.

[0048] Furthermore, an inner bearing outer cover 12 and an inner bearing inner cover 14 are fixedly installed on the sleeve flange 13. The inner bearing outer cover 12 and the inner bearing inner cover 14 enclose an inner bearing mounting cavity. The first inner bearing 7 and the second inner bearing 8 are respectively installed in the two bearing mounting cavities, and both bearing mounting cavities are connected to the lubrication channel. Similarly, the mounting area of ​​the outer bearing 9 is enclosed by the bearing housing inner cover 11 and the end side wall of the mounting base to form a mounting cavity for the outer bearing 9.

[0049] The inner bearing outer cover 12 and the inner bearing inner cover 14 combine to form a sealed inner bearing mounting cavity, encapsulating the first inner bearing 7 and the second inner bearing 8 respectively. Lubricant is injected into the mounting cavity through a lubrication channel to achieve bearing lubrication. The sealed mounting cavity structure effectively prevents lubricant leakage and the entry of external impurities, ensuring that the bearing is always in a good lubrication state, achieving effective lubrication and cooling of the corresponding bearing by the lubricant.

[0050] In this embodiment, a transition sleeve is installed between the induction winding rotor 19 and the output shaft. The transition sleeve serves as a connector to fix the induction winding rotor 19 on the output shaft.

[0051] In one embodiment, a collector ring 21 is fixedly provided at the tail end of the output shaft, and an output cable 4 is connected to the collector ring 21. The output cable 4 extends to the inner side of the dual permanent magnet rotor 20 and connects to the induction winding rotor 19.

[0052] The slip ring 21 rotates with the output shaft. One end of the lead cable 4 is connected to the slip ring 21, and the other end is connected to the induction winding rotor 19, thus leading the electrical energy generated by the induction winding rotor 19 to the external circuit. This realizes the transfer of electrical energy between the induction winding rotor 19 and the external circuit, allowing the slip power to be effectively utilized by leading it out through the slip ring 21, thereby improving the energy recovery efficiency of the motor.

[0053] In this embodiment, the lead cable 4 extends along the lubrication channel and passes through the output shaft to extend to the inner side of the dual permanent magnet rotor 20. This protects the lead cable 4 from external interference and damage, reduces wear on the lead cable 4, saves internal space in the mounting base 10, and avoids interference between the lead cable 4 and rotating parts, thereby improving the compactness and reliability of the motor's internal structure.

[0054] In one embodiment, a protective cover 23 is fixedly mounted on one end of the mounting base 10, and the slip ring 21 is installed inside the protective cover 23. The protective cover 23 provides effective physical protection for the slip ring 21, preventing external factors such as dust and moisture from affecting the operation of the slip ring 21, thereby improving the service life and operational reliability of the slip ring 21.

[0055] Furthermore, a carbon brush 22 is installed inside the protective cover 23. The carbon brush 22 is slidably conductively connected to the slip ring 21 and is connected to an external power supply device. The carbon brush 22 is installed inside the protective cover 23 and maintains sliding contact with the slip ring 21. The sliding contact between the carbon brush 22 and the slip ring 21 ensures stable power transmission between the rotating and stationary parts, and ensures the continuity of the current signal between the induction winding rotor 19 and the external circuit.

[0056] In this embodiment, a guide is installed on the protective cover 23, and a guide groove 241 is provided on the guide. A guide post 114 is provided on the lubricant distributor. The lubricant distributor is disposed through the protective cover 23. The guide post 114 and the guide groove 241 are slidably engaged. The guide groove 241 extends along the axial direction of the output shaft.

[0057] The guide component is fixed to the protective cover 23, and its guide groove 241 cooperates with the guide post 114 on the lubricant distributor. When the lubricant distributor moves axially along the output shaft, the guide post 114 slides within the guide groove 241, guiding the movement direction of the lubricant distributor. The guide groove 241 guides the movement distance and position of the lubricant distributor, ensuring the stability of the lubricant distributor during axial movement and achieving control of the lubrication position.

[0058] In this embodiment, a permanent magnet motor output shaft assembly is also provided as the output shaft, including a shaft body 5, an isolator, and an oil supply pipe. The shaft body 5 is a long shaft-like part with a central hole machined along its axial direction. One end of the central hole is open and penetrates the end face of the shaft body 5, while the other end can be closed or connected to other channels depending on actual structural requirements. A first oil injection hole 5112 and a second oil injection hole 5117 are machined in the radial direction of the shaft body 5. Both the first oil injection hole 5112 and the second oil injection hole 5117 start from the outer circumferential surface of the shaft body 5, penetrate the side wall of the shaft body 5 radially or obliquely, and then communicate with the internal central hole.

[0059] The isolator is fixedly installed on the shaft body 5. Specifically, the isolator extends circumferentially along the shaft body 5, with a portion of its structure extending into the interior space of the central hole. The first oil injection hole 5112 and the second oil injection hole 5117 are arranged on both sides of the isolator along the axial direction of the shaft body 5. The oil supply pipe is fitted inside the central hole of the shaft body 5, maintaining an appropriate clearance between its outer diameter and the inner diameter of the central hole to ensure relative sliding. At least two oil passage holes 3111 with a certain axial spacing are provided on the circumference of the oil supply pipe wall. The oil supply pipe can slide within the central hole along its axial direction and has a specific working state, namely the oil injection state: when the oil supply pipe is moved to a certain axial position, one of its oil passage holes 3111 can be aligned and connected with the first oil injection hole 5112, or the other oil passage hole 3111 can be aligned and connected with the second oil injection hole 5117. During this process, the isolation element forms a tight contact with the outer cylindrical surface of the oil pipeline to seal and isolate the oil injection area within the central hole.

[0060] The permanent magnet motor output shaft assembly is specifically designed and applied to dual-rotor permanent magnet speed-regulating motors. Its core function is to add and replenish grease to the internal bearings mounted on the output shaft of the motor during continuous operation without stopping the motor. When the dual-rotor permanent magnet speed-regulating motor is in normal operation, its output shaft, i.e., the shaft body 5 in this embodiment, is rotating at high speed. If lubrication is required for the first internal bearing 7 or the second internal bearing 8 at different positions inside the motor, axial displacement is generated within the central hole by driving the oil supply pipe. Axial movement can change the relative positional relationship between the oil passage hole 3111 on the oil supply pipe and the oil injection hole on the shaft body 5. By controlling the movement distance of the oil supply pipe, a specific oil passage hole 3111 can be aligned with the first oil injection hole 5112 or the second oil injection hole 5117 on one side of the isolation component to form a connecting oil passage. At the same time, the isolation component and the outer wall of the oil supply pipe always maintain a good sealing contact, thereby ensuring that the grease pumped into the oil supply pipe from the outside can only flow out through the currently aligned and connected oil passage 3111 and the corresponding oil injection hole combination channel, and finally the grease can be delivered to the lubrication point of the target inner bearing.

[0061] This embodiment integrates a central channel, multiple radial oil injection holes, a sealing and isolating component, and an axially movable oil delivery pipe within the shaft body 5 to construct a built-in, selective grease delivery system. This solves the technical problem of traditional dual-rotor permanent magnet speed-regulating motors requiring shutdown for lubrication, enabling the motor to meet the requirements of continuous operation and year-round uninterrupted operation in modern industrial production, effectively avoiding production interruptions and efficiency losses due to shutdown for maintenance and lubrication.

[0062] It should be noted that one of the core improvements of this utility model embodiment is that the central hole serving as the lubrication channel, the movable oil supply pipe and the oil passage hole 3111, as well as the selective isolation component are integrated inside the high-speed rotating shaft body 5. Different lubrication paths can be switched by simple axial movement, thereby achieving selective and directional lubrication of multiple bearing lubrication points without stopping the output shaft.

[0063] In one embodiment, the isolation element includes a first isolation pin 52. The outer diameter of the first isolation pin 52 is not less than the inner diameter of the central hole at the corresponding position of the first isolation pin 52. The first isolation pin 52 is provided with a through hole 5211, which is aligned with the central hole, and the inner diameter of the through hole 5211 is not greater than the outer diameter of the oil pipe, so that the oil pipe can be sealed and penetrated into the through hole 5211. In the assembled state, the first isolation pin 52 is securely installed inside the central hole of the shaft body 5, and the installation direction of the first isolation pin 52 extends along the circumference of the shaft body 5. The through hole 5211 on the first isolation pin 52 is adapted to the outer wall surface of the oil pipe, and can form a tight fit with the outer wall surface of the oil pipe during operation.

[0064] When the permanent magnet motor output shaft assembly is working, the first isolation pin 52 is installed in the first pin hole 5113 within the central hole of the shaft body 5. As the oil supply pipe moves axially within the central hole, the through hole 5211 of the first isolation pin 52 always maintains a tight contact with the outer wall surface of the oil supply pipe. When the oil supply pipe moves to a specific oil filling position, the engagement between the through hole 5211 of the first isolation pin 52 and the outer wall of the oil supply pipe effectively seals the corresponding section of the central hole, thereby preventing lubricant leakage into the remaining space. This ensures the singularity and determinism of the lubricant flow path, meaning that the lubricant can only flow to the target oil filling hole through the designated, currently aligned oil passage 3111 on the oil supply pipe, effectively preventing cross-flow of lubricant between different oil passages, improving the accuracy of the oil filling operation and the reliability of the entire lubrication system.

[0065] Furthermore, the isolation component also includes a second isolation pin 54, which is inserted into a second pin hole 5115 extending circumferentially on the shaft body 5, and the second isolation pin also extends into the central hole. The outer diameter of the second isolation pin 54 is not less than the inner diameter of the central hole to seal the central hole. The second oil injection hole 5117 communicates with the central hole between the first isolation pin 52 and the second isolation pin 54. In this embodiment, the shape of the second isolation pin 54 is the same as that of the first isolation pin 52, and the way the second isolation pin 54 is fitted with the oil pipe is the same as that of the first isolation pin 52 with the oil pipe.

[0066] The second oil injection hole 5117 communicates with the central hole area between the first isolation pin 52 and the second isolation pin 54. When oil needs to be injected into the second inner bearing 8, the oil supply pipe moves to the corresponding position, aligning the area of ​​the second oil injection hole 5117 with the oil passage hole 3111 of the oil supply pipe, thereby realizing the delivery of lubricant to the second inner bearing 8. The addition of the second isolation pin 54, working together with the first isolation pin 52, ensures that lubricant can only enter the corresponding bearing through the designated oil injection hole, effectively preventing cross-contamination of lubricant between different oil injection areas and improving the reliability of lubrication.

[0067] In one embodiment, the first oil injection hole 5112 is arranged perpendicularly to the central hole and is adapted to communicate with the first inner bearing 7, which is adapted to be supported and mounted on the shaft body 5. The first oil injection hole 5112 is used to provide lubricant to the first inner bearing 7. The second oil injection hole 5117 extends obliquely along the side wall of the shaft body 5 and its output end communicates with the second inner bearing 8, which is adapted to be supported and mounted on the shaft body 5. The second oil injection hole 5117 is used to provide lubricant to the second inner bearing 8.

[0068] When the oil supply pipe moves axially within the central hole, the oil passage hole 3111 on the oil supply pipe aligns with the first oil injection hole 5112 or the second oil injection hole 5117, thereby realizing the oil injection operation to the first inner bearing 7 or the second inner bearing 8.

[0069] In one embodiment, a transition hole 5114 is provided on the shaft body 5. One end of the transition hole 5114 is connected to the center hole, and the other end is sealed by a sealing member to close the transition hole 5114. The second oil injection hole 5117 is connected to the transition hole 5114.

[0070] When oil needs to be injected into the second inner bearing 8, the lubricant flows out from the oil passage 3111 of the oil supply pipe, passes through the central hole, the transition hole 5114, and the second oil injection hole 5117 in sequence, and finally reaches the second inner bearing 8. The transition hole 5114, which is connected to the central hole and the second oil injection hole 5117, provides a buffer space for the lubricant, making the flow rate of the lubricant more uniform as it flows from the central hole to the second oil injection hole 5117, thus avoiding uneven oil injection caused by excessively fast or slow flow rates.

[0071] In another embodiment, the transition hole 5114 may not be a simple straight blind hole; its shape may be designed as a cone, a sphere, or a cavity with a specific volume to better achieve the buffer voltage regulation function.

[0072] In one embodiment, the central hole is not a simple straight hole with a uniform diameter throughout, but a composite channel composed of a front central hole 5111 and a rear central hole 5118 connected end-to-end along the axial direction. Specifically, one end of the front central hole 5111 is connected to the rear central hole 5118, while the other end is closed. The rear central hole 5118 penetrates the shaft body 5, and the inner diameter of the rear central hole 5118 is larger than the inner diameter of the front central hole 5111. The first oil injection hole 5112, the second oil injection hole 5117, and the isolation member are all located at the front central hole 5111.

[0073] When the oil supply pipe moves axially within the central hole, its oil passage 3111 aligns with the oil injection hole at the front central hole 5111, enabling the delivery of lubricant to the inner bearing. The larger inner diameter of the rear central hole 5118 facilitates the inflow and outflow of lubricant and also provides space for other components. By concentrating the lubrication channels primarily in the front central hole 5111 and designing the rear central hole 5118 with a larger inner diameter, the lubrication functional area is effectively distinguished from other functional areas, resulting in a more rational allocation of internal space within the shaft body 5 and a more compact structure.

[0074] Furthermore, the shaft body 5 is provided with a cable hole 5116. The cable hole 5116 is machined radially inward from the outer wall surface of the shaft body 5 until it penetrates the side wall thickness of the shaft body 5, and finally communicates with the internal space of the rear center hole 5118. The cable 4 is adapted to extend along the rear center hole 5118 and be led out from the cable hole 5116.

[0075] The rear center hole 5118, with its large inner diameter, provides a spacious and protected internal routing path for the lead-out cable 4. This internal routing effectively prevents potential entanglement, friction, or other interference between the lead-out cable 4 and the high-speed rotating shaft body 5 and other mechanisms. This allows the lead-out cable 4 to smoothly pass through the shaft body 5 and safely connect to the slip ring 21 mounted on the shaft end and the induction winding rotor 19 located inside the motor, thereby achieving the transmission of electrical energy and signals. Simultaneously, arranging the cable in the rear center hole 5118, while concentrating the lubrication channel primarily in the front center hole 5111, effectively prevents mutual interference between the lead-out cable 4 and the oil supply pipes or flowing lubricant, ensuring the independent and stable operation of the lubrication system and power supply system, and improving the overall reliability and safety of the motor equipment.

[0076] In one embodiment, the oil supply pipe includes an inner oil pipe 3 and an outer oil pipe 2 that are fitted together. The inner oil pipe 3 is slidably sealed at one end of the outer oil pipe 2. Both ends of the inner oil pipe 3 extend from both ends of the outer oil pipe 2 to the outside of the outer oil pipe 2. The outer oil pipe 2 is fixedly connected to the shaft body 5. The inner oil pipe 3 is adapted to slide axially relative to the outer oil pipe 2 to change the oil filling state.

[0077] The oil supply system consists of an inner oil pipe 3 and an outer oil pipe 2, which are arranged in an inner and outer sleeve. The inner oil pipe 3 can slide relative to the outer oil pipe 2. When the motor is running, the outer oil pipe 2 rotates synchronously with the shaft body 5, and the inner oil pipe 3 rotates synchronously with the outer oil pipe 2. However, the grease nipple 111 on the outer oil pipe 2 is connected to the motor base and does not rotate with the shaft body 5, so that the axial position of the inner oil pipe 3 can be moved smoothly when adding grease.

[0078] Furthermore, a limiting groove 2111 is provided in the inner cavity of the outer oil pipe 2, and a limiting pin 3112 is provided on the outer wall of the inner oil pipe 3. The limiting pin 3112 is slidably installed in the limiting groove 2111, and the limiting groove 2111 extends axially along the central hole.

[0079] A limiting groove 2111 is provided inside the outer oil pipe 2, and a limiting pin 3112 is provided on the outer wall of the inner oil pipe 3, which cooperates with the limiting groove 2111 to restrict the movement direction of the inner oil pipe 3. At the same time, when the outer oil pipe 2 rotates, it drives the inner oil pipe 3 to rotate synchronously. This ensures that the oil passage hole 3111 can be aligned and closed with the isolation component. At the same time, the length of the limiting groove 2111 can also limit the axial movement distance of the inner oil pipe 3, ensuring that when the inner oil pipe 3 moves to the point where the limiting pin 3112 abuts against both sides of the limiting groove 2111, the oil passage holes 3111 at different positions on the inner oil pipe 3 can be aligned and closed with the isolation component.

[0080] In summary, in this application, the motor winding stator 15 is fixed inside the mounting base 10, and the dual permanent magnet rotor 20 is coaxially arranged inside the motor winding stator 15. The outer circular wall of the rotor carrier 17 on the dual permanent magnet rotor 20 is provided with an outer permanent magnet 18 that is electromagnetically coupled to the motor winding stator 15; the inner circular wall of the rotor carrier 17 of the dual permanent magnet rotor 20 is provided with an inner permanent magnet 16 that is electromagnetically coupled to the induction winding rotor 19.

[0081] The dual-rotor permanent magnet speed-regulating motor is a multi-functional motor that integrates a permanent magnet motor and a permanent magnet generator. When power frequency is applied to the stator 15 of the motor windings, the outer permanent magnet 18 of the dual permanent magnet rotor 20 forms a magnetic coupling with the stator 15, maintaining synchronous speed. The magnetic lines of force of the inner permanent magnet 16 of the dual permanent magnet rotor 20 cut the windings in the induction winding rotor 19, generating an induced voltage in the induction windings. The speed of the winding rotor is controlled by controlling the induced current and voltage of the induction windings, thereby controlling the output shaft speed. Excess slip power is fed back into the control inverter for reuse through the slip rings 21 and carbon brushes 22.

[0082] The sleeve flanges 13 at both ends of the dual permanent magnet rotor 20 are supported on the shaft body 5 by the first inner bearing 7 and the second inner bearing 8. The induction winding rotor 19 is coaxially fixed on the shaft body 5 by the inner winding rotor transition sleeve 6. The shaft body 5 is supported on the mounting base 10 by the outer bearings 9 at both ends. The slip ring 21 is set on the output shaft. The carbon brush 22 is fixed on the protective cover 23. The protective cover 23 is connected and fixed to the mounting base 10.

[0083] The lead cable 4 connects the inner winding rotor to the slip ring 21 through radial holes and axial center holes on the shaft body 5. An oil passage and a sealed cavity for lubricating the inner bearing are also provided at the centerline of the shaft body 5. This oil passage contains an oil supply pipe composed of an outer oil pipe 2 and an inner oil pipe 3. A rotary oil injector 1 is provided at the end of the inner oil pipe 3. A guide post 114 is provided on the outer circumference of the rotary oil injector 1, and the guide post 114 is engaged in the guide groove 241 of the floating elastic guide plate 24. The floating elastic guide plate 24 is fixed to the protective cover 23.

[0084] The shaft body 5 is provided with a front center hole 5111, a first oil injection hole 5112, a first pin hole 5113, a transition hole 5114, a second pin hole 5115, a cable hole 5116, a second oil injection hole 5117, a rear center hole 5118, and a positioning step 5119 for the inner oil pipe 3 cable fixing plate 212. The cable hole 5116 passes through the rear center hole 5118, and the transition hole 5114 passes through the second oil injection hole 5117. A first plug 51 is used to seal the head of the front center hole 5111 to prevent grease from overflowing from the head of the front center hole 5111.

[0085] The second isolation pin 54 is tightly fitted into the second pin hole 5115, and the first isolation pin 52 is tightly fitted into the first pin hole 5113. A fluid passage space is reserved between the second isolation pin 54 and the first isolation pin 52, which communicates with the transition hole 5114 and is fitted with the inner oil pipe 3.

[0086] The oil filling route of the first inner bearing 7 is as follows: inner oil pipe 3 - oil passage hole 3111 at the right end - front center hole 5111 - first oil filling hole 5112 on the right side.

[0087] The oil injection route of the second inner bearing 8 is as follows: inner oil pipe 3 - oil passage hole 3111 at the left end - transition hole 5114 - second oil injection hole 5117 inclined on the left side, and second plug 53 is used to block the radial outlet of transition hole 5114.

[0088] The rotary oiler 1 consists of an oil nozzle 111, a rotary oiler housing 112, a sealing ring 113, a guide post 114, an oiling bearing 115, and a bearing retaining ring 116. The sealing ring 113 seals the inner oil pipe 3 with the rotary oiler housing 112. The bearing retaining ring 116 secures the inner and outer rings of the bearing, fixing it to the inner oil pipe 3 and the rotary oiler housing 112. The left end of the inner oil pipe 3 has a limiting pin 3112 and an oil passage hole 3111; the oil outlet end of the inner oil pipe 3 is sealed. The outer oil pipe 2 has an oil pipe sealing ring 211 and a cable fixing plate 212. The cable fixing plate 212 has a cable passage hole 2112 for the cable 4 and a bolt hole 2113 for connection to the shaft body 5. The right end of the outer oil pipe 2 has a limiting groove 2111 that mates with the limiting pin 3112 of the inner oil pipe 3.

[0089] The rotation of the shaft body 5 drives the outer oil pipe 2 to rotate, and the limiting groove 2111 of the outer oil pipe 2 drives the limiting pin 3112 of the inner oil pipe 3 to rotate simultaneously. The rotating filler housing 112 of the rotating oiler 1 is restricted from circumferential rotation by the guide post 114, keeping the oil nozzle 111 from rotating.

[0090] Oiling principle: The oiler is connected to the oil nozzle 111. Rotating the oiler 1 axially moves the inner oil pipe 3 axially, thus oiling the inner bearings at different locations. Figure 2 This is a schematic diagram of lubricating the first inner bearing 7 on the right end. At this time, the oil outlet on the left side of the inner oil pipe 3 is sealed by the first isolation pin 52, and oil flows out from the oil outlet on the right side. Figure 3 This is a schematic diagram of lubricating the second inner bearing 8 on the left end. At this time, the oil outlet on the right side of the inner oil pipe 3 is sealed by the first isolation pin 52, and oil flows out from the oil outlet on the left side. The length of the waist hole of the elastic guide plate 24 enables the positioning of the oil outlet.

[0091] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A dual-rotor permanent magnet speed-regulating motor, characterized in that, include: The mounting base (10) is a shell structure. The mounting base (10) has a mounting cavity formed inside. The motor winding stator (15) is fixedly installed on the inner side wall of the mounting cavity. The output shaft passes through the mounting base (10) axially. Both ends of the mounting base (10) are supported on the output shaft by external bearings (9). The mounting base (10) is rotatably supported on the output shaft by external bearings (9). The dual permanent magnet rotor (20) is coaxially mounted inside the motor winding stator (15). The two ends of the dual permanent magnet rotor (20) are supported and mounted on the output shaft by the first inner bearing (7) and the second inner bearing (8), respectively. An induction winding rotor (19) is sleeved between the dual permanent magnet rotor (20) and the output shaft. The output shaft is provided with a lubrication channel along its axial direction. A lubricant distributor is slidably installed in the lubrication channel. By moving the lubricant distributor axially, lubricant can be selectively delivered to the first inner bearing (7) or the second inner bearing (8).

2. The dual-rotor permanent magnet speed-regulating motor according to claim 1, characterized in that, Both ends of the dual permanent magnet rotor (20) are equipped with sleeve flanges (13). The outer rings of the first inner bearing (7) and the second inner bearing (8) are respectively interference-fitted with the corresponding sleeve flanges (13). The inner rings of the first inner bearing (7) and the second inner bearing (8) are both interference-fitted with the output shaft.

3. The dual-rotor permanent magnet speed-regulating motor according to claim 2, characterized in that, The dual permanent magnet rotor (20) includes a rotor carrier (17), which is coaxially mounted inside the motor winding stator (15). An outer permanent magnet (18) is fixedly mounted on the outside of the rotor carrier (17). The outer permanent magnet (18) is arranged correspondingly to the motor winding stator (15) to form a first magnetic coupling pair. An inner permanent magnet (16) is fixedly mounted inside the rotor carrier (17). The inner permanent magnet (16) is arranged correspondingly to the induction winding rotor (19) to form a second magnetic coupling pair.

4. The dual-rotor permanent magnet speed-regulating motor according to claim 2 or 3, characterized in that, The sleeve flange (13) is fixedly installed with an inner bearing outer cover (12) and an inner bearing inner cover (14). The inner bearing outer cover (12) and the inner bearing outer cover (12) enclose an inner bearing mounting cavity. The first inner bearing (7) and the second inner bearing (8) are respectively installed in the two bearing mounting cavities. Both bearing mounting cavities are connected to the lubrication channel.

5. The dual-rotor permanent magnet speed-regulating motor according to any one of claims 1 to 3, characterized in that, A transition sleeve is installed between the induction winding rotor (19) and the output shaft.

6. The dual-rotor permanent magnet speed-regulating motor according to any one of claims 1 to 3, characterized in that, The output shaft is also fixedly provided with a collector ring (21), and a lead cable (4) is connected to the collector ring (21). The lead cable (4) extends to the inside of the dual permanent magnet rotor (20) and connects to the induction winding rotor (19).

7. The dual-rotor permanent magnet speed-regulating motor according to claim 6, characterized in that, The lead cable (4) extends along the lubrication channel and passes through the output shaft to extend to the inside of the dual permanent magnet rotor (20).

8. The dual-rotor permanent magnet speed-regulating motor according to claim 6, characterized in that, A protective cover (23) is installed at one end of the mounting base (10), and the collector ring (21) is installed inside the protective cover (23).

9. The dual-rotor permanent magnet speed-regulating motor according to claim 8, characterized in that, A carbon brush (22) is fixedly installed inside the protective cover (23). The carbon brush (22) is slidably conductively connected to the collector ring (21). The carbon brush (22) is connected to an external power supply device.

10. The dual-rotor permanent magnet speed-regulating motor according to claim 8 or 9, characterized in that, A guide is installed on the protective cover (23), and a guide groove (241) is provided on the guide. A guide post (114) is provided on the lubricant distributor. The lubricant distributor is provided through the protective cover (23). The guide post (114) is slidably engaged with the guide groove (241). The guide groove (241) extends along the axial direction of the output shaft.

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