Magnetic regulation and speed regulation control method for brushless magnetic regulation type permanent magnet eddy current coupler

Abstract

The invention provides a magnetic regulation and speed regulation control method for a brushless magnetic regulation type permanent magnet eddy current coupler, and the permanent magnet eddy current coupler carries out the dynamic coupling through a permanent magnet rotor, and adjusts the magnetic force output of the permanent magnet rotor through a magnetic regulation winding at the permanent magnet rotor. Memory magnetic regulation speed regulation or pole-changing magnetic regulation speed regulation is carried out on a permanent magnet rotor through a magnetic regulation winding, the magnetic regulation winding is powered by a magnetic coupling resonator, a transmitting end coil and a receiving end coil of the magnetic coupling resonator are oppositely arranged, a receiving end is connected with the magnetic regulation winding through a rotary rectifier, and the receiving end coil synchronously rotates along with the permanent magnet rotor. The transmitting end coil is statically arranged outside the magnetic coupler; according to the invention, different torque intervals are divided under the same slip frequency, and the permanent magnet pole number mode and the corresponding magnetization state are selected according to the load torque type and the torque interval to which the load torque belongs, so that the magnetic regulation and speed regulation control method of the permanent magnet eddy current coupler can be optimized.

Description

Technical Field

[0001] The present invention relates to the field of permanent magnet eddy current couplings, and in particular to a control method for magnetic field regulation and speed regulation of a brushless magnetic field regulation type permanent magnet eddy current coupling. Background Art

[0002] With the emergence of high-performance magnetic materials, especially NdFeB rare earth permanent magnet materials, the speed regulation drive of permanent magnet eddy current couplings has developed rapidly. Compared with traditional variable frequency speed regulation drives and hydraulic coupling speed regulation drives, the speed regulation drive of permanent magnet eddy current couplings has the advantages of non-contact, isolation of vibration and noise, tolerance of a certain misalignment error, soft start and overload protection, etc., overcomes the problems existing in mechanical transmissions such as vibration noise, friction and wear, and mechanical fatigue, changes the traditional speed regulation drive concept, and truly realizes green drive, and can be widely applied to the speed regulation drive systems of fans and pumps in industries such as electric power, iron and steel, petrochemical, and coal.

[0003] How to further optimize the magnetic field regulation and speed regulation control of permanent magnet eddy current couplings is a research direction. Summary of the Invention

[0004] The present invention proposes a control method for magnetic field regulation and speed regulation of a brushless magnetic field regulation type permanent magnet eddy current coupling. By dividing different torque intervals under the same slip and selecting the permanent magnet pole number mode and the corresponding magnetization state according to the load torque type and the torque interval to which the load torque belongs, the magnetic field regulation and speed regulation control method of the permanent magnet eddy current coupling can be optimized.

[0005] The present invention adopts the following technical solutions.

[0006] A control method for magnetic field regulation and speed regulation of a brushless magnetic field regulation type permanent magnet eddy current coupling. The permanent magnet eddy current coupling performs power coupling through a permanent magnet rotor, and adjusts the magnetic force output of the permanent magnet rotor through a magnetic field regulation winding at the permanent magnet rotor. In the control method, memory magnetic field regulation speed regulation or pole-changing magnetic field regulation speed regulation is performed on the permanent magnet rotor through the magnetic field regulation winding. The magnetic field regulation winding is powered by a magnetic coupling resonator. The transmitting end coil and the receiving end coil of the magnetic coupling resonator are placed opposite to each other. The receiving end is connected to the magnetic field regulation winding through a rotating rectifier. The receiving end coil rotates synchronously with the permanent magnet rotor, and the transmitting end coil is fixedly arranged outside the magnetic coupler.

[0007] The magnetic circuit of the permanent magnet rotor is formed by an AlNiCo component and multiple NdFeB components bypassing adjacent thereto; the receiving end of the magnetic coupling resonator is connected to the magnetic field regulation winding on the permanent magnet rotor through a rotating rectifier.

[0008] In the pole-changing magnetic field regulation speed regulation, a multi-permanent magnet pole number mode pole-changing magnetic field regulation speed regulation method is adopted. By bypassing the magnetic paths of two NdFeB components adjacent to the magnetic path of the AlNiCo component, the permanent magnet rotor operates in three permanent magnet pole number modes of 18 poles, 9 poles and 0 poles.

[0009] The receiving end of the magnetic coupling resonator is connected to the magnetic modulation winding on the permanent magnet rotor through a rotary rectifier; In the variable pole magnetic modulation speed regulation, there are three permanent magnet pole number modes of 18 poles, 9 poles and 0 poles. The switching method of the magnetic modulation winding is as follows: the magnetic modulation winding is divided into two parts, which are connected in series respectively to form phase splitting, and are controlled by two different relays. Then the phase-split magnetic modulation winding is connected to the rotary rectifier, and the operating condition of the magnetic modulation winding of the permanent magnet rotor is switched by controlling the on-off of the two relays, so that the magnetic modulation winding applies a corresponding saturated magnetization current pulse or a complete demagnetization current pulse to the permanent magnet rotor, so as to realize the operation of the coupler in three permanent magnet pole number modes of 18 poles, 9 poles and 0 poles.

[0010] The magnetic modulation speed regulation control method introduces environmental factors such as load conditions, permanent magnet fatigue and temperature influence. By adopting the brushless magnetic modulation type permanent magnet eddy current coupling composite magnetic modulation speed regulation control method, the mechanical characteristic curves of the brushless magnetic modulation type permanent magnet eddy current coupling in three permanent magnet pole number modes of 18 poles, 9 poles and 0 poles and the corresponding limited magnetization states are established.

[0011] According to the corresponding data of the mechanical characteristic curves, the magnetic modulation speed regulation control method divides different torque intervals at the same slip. When it is necessary to increase the load torque that the system can bear and keep the load speed unchanged, the magnetization intensity of the permanent magnet is increased; when it is necessary to reduce the load torque that the system can bear and keep the load speed unchanged, the magnetization intensity of the permanent magnet is reduced.

[0012] In the magnetic modulation speed regulation control method, the load torque is divided into constant torque load and parabolic load. The speed regulation range is judged by the intersection points of different loads and the corresponding data of the mechanical characteristic curves. According to the load torque type and the torque interval to which the load torque belongs, the permanent magnet pole number mode and the corresponding limited magnetization state are selected based on loss optimization distribution to realize the wide-area and high-efficiency operation of the brushless magnetic modulation type permanent magnet eddy current coupling.

[0013] The permanent magnet rotor includes a soft magnetic body. In the magnetic modulation speed regulation control method: Figure 5 It can be seen that for a constant torque load, by passing an exciting current and reducing the magnetization state of the soft magnetic body to weaken the magnetic force of the permanent magnet, the working state of the magnetic coupler is within the corresponding magnetic modulation region, from point A to point B, achieving the effect of keeping the output torque unchanged and increasing the speed; by passing an exciting current and increasing the magnetization state of the soft magnetic body to enhance the magnetic force of the permanent magnet, the working state of the magnetic coupler is within the corresponding magnetic modulation region, from point B to point C, achieving the effect of keeping the speed unchanged and increasing the output torque. The permanent magnet rotor includes a soft magnetic body. From Figure 6 It can be seen that for a parabolic load, by passing an exciting current and changing the magnetization state of the soft magnetic body, the effect of increasing / decreasing the output torque while increasing / decreasing the speed is achieved.

[0014] AsFigure 1 As shown, the transmitting end in the magnetic coupling resonator is connected to the high-frequency inverter power supply. The transmitting end is installed outside the magnetic coupler and remains stationary. The receiving end is connected to the magnetic modulation winding on the permanent magnet rotor through a rotary rectifier and rotates synchronously with the permanent magnet rotor. The transmitting end coil and the receiving end coil in the magnetic coupling resonator are placed opposite to each other and keep the relative area unchanged to ensure efficient energy transmission. The specific overall machine diagram is as Figure 2 shown.

[0015] The present invention relates to a magnetic modulation speed regulation control method for a brushless magnetic modulation type permanent magnet eddy current coupler. The permanent magnet rotor adopts two speed regulation modes of memory magnetic modulation and pole-changing magnetic modulation. The magnetic modulation winding is powered by a rotary magnetic coupling resonator. The receiving end of the rotary magnetic coupling resonator is connected to the magnetic modulation winding on the permanent magnet rotor through a rotary rectifier and rotates synchronously with the permanent magnet rotor. The transmitting end coil and the receiving end coil are placed opposite to each other and keep the relative area unchanged to ensure efficient energy transmission. The pole-changing speed regulation is realized by bypassing two adjacent NdFeB magnetic paths with AlNiCo, so that the permanent magnet rotor operates in three permanent magnet pole number modes of 18 poles, 9 poles and 0 poles. The magnetic modulation speed regulation divides different torque intervals under the same slip and, according to the load torque type and the torque interval to which the load torque belongs, reasonably selects the permanent magnet pole number mode and the corresponding limited magnetization state based on loss optimization distribution. This magnetic modulation speed regulation control method for the brushless magnetic modulation type permanent magnet eddy current coupler provides an idea for the research on optimizing the magnetic modulation speed regulation control method of the permanent magnet eddy current coupler by dividing different torque intervals under the same slip and selecting the permanent magnet pole number mode and the corresponding magnetization state according to the load torque type and the torque interval to which the load torque belongs.

[0016] The advantage of the present invention is that it can increase the speed regulation range by dividing different torque intervals under the same slip and selecting the permanent magnet pole number mode and the corresponding magnetization state according to the load torque type and the torque interval to which the load torque belongs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments: Attached Figure 1 is a schematic structural diagram of the rotary magnetic coupling resonator in the specific embodiment of the present invention; Attached Figure 2 is a schematic structural diagram of the multi-permanent magnet pole number mode of the brushless magnetic modulation type permanent magnet coupler in the specific embodiment of the present invention (the white arrow is the excitation direction); Attached Figure 3 is a schematic diagram of the magnetic modulation winding switching method in the specific embodiment of the present invention; Attached Figure 4 is a schematic diagram of the mechanical characteristic curve under different magnetization states in the specific embodiment of the present invention (for constant torque load); Attached Figure 5It is another schematic diagram of the mechanical characteristic curve under different magnetization states in the specific embodiment of the present invention (for parabolic load); Appendix Figure 6 It is an exploded view of the permanent magnet eddy current coupler in the specific embodiment of the present invention; Appendix Figure 7 It is another exploded view of the permanent magnet eddy current coupler in the specific embodiment of the present invention; Appendix Figure 8 It is a schematic diagram of the conductor rotor structure in the embodiment; Appendix Figure 9 It is a schematic diagram of the permanent magnet rotor structure in the embodiment; Appendix Figure 10 It is a schematic diagram of the transmitting end structure of the magnetic coupling resonator in the embodiment; Appendix Figure 11 It is a schematic diagram of the receiving end structure of the magnetic coupling resonator in the embodiment; Appendix Figure 12 In the embodiment, it is a schematic diagram of the change of the AlNiCo hysteresis loop during the magnetic field adjustment process. Specific Embodiment

[0018] As shown in the figure, a brushless magnetic field adjustment type permanent magnet eddy current coupler magnetic field adjustment speed control method, the permanent magnet eddy current coupler performs power coupling through a permanent magnet rotor, and adjusts the magnetic force output of the permanent magnet rotor through a magnetic field adjustment winding at the permanent magnet rotor. In the control method, memory magnetic field adjustment speed control or pole-changing magnetic field adjustment speed control is performed on the permanent magnet rotor through the magnetic field adjustment winding. The magnetic field adjustment winding is powered by a magnetic coupling resonator. The transmitting end coil and the receiving end coil of the magnetic coupling resonator are placed opposite to each other. The receiving end is connected to the magnetic field adjustment winding through a rotary rectifier. The receiving end coil rotates synchronously with the permanent magnet rotor, and the transmitting end coil is fixedly arranged outside the magnetic coupler.

[0019] In this example, an alternating magnetic field is generated after passing a current through the transmitting end coil, and an induced current is generated in the receiving end coil by the alternating magnetic field to supply power to the magnetic field adjustment winding.

[0020] Such as Figure 9 shown, the magnetic circuit of the permanent magnet rotor is formed by an AlNiCo component and multiple NdFeB components bypassed adjacent to it; the receiving end of the magnetic coupling resonator is connected to the magnetic field adjustment winding on the permanent magnet rotor through a rotary rectifier.

[0021] In the pole-changing magnetic field adjustment speed control, a multi-permanent magnet pole number mode pole-changing magnetic field adjustment speed control method is adopted. By bypassing the magnetic paths of two NdFeB components adjacent to the magnetic path of the AlNiCo component, the permanent magnet rotor operates in three permanent magnet pole number modes of 18 poles, 9 poles, and 0 poles.

[0022] The receiving end of the magnetic coupling resonator is connected to the magnetic field adjustment winding on the permanent magnet rotor through a rotary rectifier; In the variable pole and field regulation speed control, there are three permanent magnet pole number modes of 18 poles, 9 poles, and 0 poles. The switching method of the field regulation winding is as follows: The field regulation winding is divided into two parts, which are connected in series respectively to form phase splitting, controlled by two different relays, and the phase-split field regulation winding is connected to the rotating rectifier. By controlling the on / off of the two relays, the operating conditions of the field regulation winding of the permanent magnet rotor are switched, so that the field regulation winding applies corresponding saturated magnetization current pulses or complete demagnetization current pulses to the permanent magnet rotor, so as to realize the operation of the coupler in three permanent magnet pole number modes of 18 poles, 9 poles, and 0 poles.

[0023] The field regulation speed control method introduces environmental factors such as load conditions, permanent magnet fatigue, and temperature effects. By adopting the brushless field regulation type permanent magnet eddy current coupler composite field regulation speed control method, the mechanical characteristic curves of the brushless field regulation type permanent magnet eddy current coupler in three permanent magnet pole number modes of 18 poles, 9 poles, and 0 poles and the corresponding limited magnetization states are established.

[0024] According to the corresponding data of the mechanical characteristic curves, the field regulation speed control method divides different torque intervals at the same slip. When it is necessary to increase the load torque that the system can bear and keep the load speed unchanged, the magnetization intensity of the permanent magnet is increased; when it is necessary to reduce the load torque that the system can bear and keep the load speed unchanged, the magnetization intensity of the permanent magnet is reduced.

[0025] In the field regulation speed control method, the load torque is divided into constant torque load and parabolic load. The speed regulation range is judged by the intersection points of different loads and the corresponding data of the mechanical characteristic curves. According to the load torque type and the torque interval to which the load torque belongs, the permanent magnet pole number mode and the corresponding limited magnetization state are selected based on loss optimization distribution to realize the wide-area and high-efficiency operation of the brushless field regulation type permanent magnet eddy current coupler.

[0026] The permanent magnet rotor includes a soft magnetic body. In the field regulation speed control method: Figure 5 It can be seen that for a constant torque load, by passing an exciting current and reducing the magnetization state of the soft magnetic body to weaken the magnetic force of the permanent magnet, the working state of the magnetic coupler is within the corresponding field regulation region, from point A to point B, achieving the effect of keeping the output torque unchanged and increasing the speed; by passing an exciting current and increasing the magnetization state of the soft magnetic body to enhance the magnetic force of the permanent magnet, the working state of the magnetic coupler is within the corresponding field regulation region, from point B to point C, achieving the effect of keeping the speed unchanged and increasing the output torque. The permanent magnet rotor includes a soft magnetic body. From Figure 6 It can be seen that for a parabolic load, by passing an exciting current and changing the magnetization state of the soft magnetic body, the effect of increasing / decreasing the output torque while increasing / decreasing the speed is achieved.

[0027] Such as Figure 1As shown, the transmitting end in the magnetic coupling resonator is connected to the high-frequency inverter power supply. The transmitting end is installed outside the magnetic coupler and remains stationary. The receiving end is connected to the magnetic modulation winding on the permanent magnet rotor through a rotary rectifier and rotates synchronously with the permanent magnet rotor. The transmitting end coil and the receiving end coil in the magnetic coupling resonator are placed opposite to each other and maintain a constant relative area to ensure efficient energy transmission. The specific overall machine diagram is as shown in Figure 2 shown.

[0028] Embodiment 1: In this example, a brushless magnetic modulation type permanent magnet eddy current coupling magnetic modulation speed regulation control method is provided. The permanent magnet rotor adopts two speed regulation modes of memory magnetic modulation and pole-changing magnetic modulation, and the magnetic modulation winding is powered by a rotary magnetic coupling resonator. As shown in Figure 1 shown, the high-frequency inverter power supply is connected to the transmitting end in the magnetic coupling resonator and remains stationary outside the magnetic coupler. The receiving end is connected to the magnetic modulation winding on the permanent magnet rotor through a rotary rectifier and rotates synchronously with the permanent magnet rotor. The transmitting end coil and the receiving end coil are placed opposite to each other and maintain a constant relative area to ensure efficient energy transmission. The specific overall machine diagram is as shown in Figure 2 shown.

[0029] The pole-changing speed regulation adopts a multi-permanent magnet pole number mode pole-changing magnetic modulation speed regulation method. As shown in Figure 3 shown, by bypassing two adjacent NdFeB magnetic paths with AlNiCo, the permanent magnet rotor can operate in three permanent magnet pole number modes of 18 poles, 9 poles, and 0 poles.

[0030] For the three permanent magnet pole number modes of 18 poles, 9 poles, and 0 poles, the switching method of the magnetic modulation winding is as follows: As shown in Figure 3 shown, the magnetic modulation winding is divided into two parts, which are connected in series respectively, controlled by different relays, and the phase-split magnetic modulation winding is connected to the rotary rectifier. By controlling the on-off of relays KM1 and KM2, the magnetic modulation winding of the permanent magnet rotor can be switched, and corresponding saturated magnetization or completely demagnetized current pulses can be applied to realize the operation of the coupling in three permanent magnet pole number modes of 18 poles, 9 poles, and 0 poles.

[0031] Considering the load conditions, permanent magnet fatigue, and temperature effects, a brushless magnetic modulation type permanent magnet eddy current coupling composite magnetic modulation speed regulation control technology is adopted. As shown in Figure 5 shown, the mechanical characteristic curves of the brushless magnetic modulation type permanent magnet eddy current coupling in three permanent magnet pole number modes of 18 poles, 9 poles, and 0 poles and the corresponding limited magnetization states are established.

[0032] According to the mechanical characteristic curves, when the load speed remains unchanged, increasing the magnetization intensity of the permanent magnet, the load torque that the system can bear becomes larger; decreasing the magnetization intensity of the permanent magnet, the load torque that the system can withstand decreases, that is, different torque intervals are divided at the same slip.

[0033] The load torque is divided into constant torque load and parabolic load. The speed regulation range is judged by the intersection points of different loads and the mechanical characteristic curve. According to the type of load torque and the torque range to which the load torque belongs, based on loss optimization distribution, the permanent magnet pole number mode and the corresponding finite magnetization state are reasonably selected to achieve wide - area and high - efficiency operation of the brushless magnetic - field - regulating permanent magnet eddy current coupler.

[0034] It can be seen from Figure 5 that for the constant torque load, when the exciting current is applied, the magnetization state of the soft magnetic body is reduced, and the working state of the magnetic coupler changes from point A to point B, achieving the effect of keeping the output torque unchanged and increasing the speed; when the exciting current is applied, the magnetization state of the soft magnetic body is increased, and the working point of the magnetic coupler changes from point B to point C, achieving the effect of keeping the speed unchanged and increasing the output torque.

[0035] It can be seen from Figure 6 that for the parabolic load, when the exciting current is applied, the magnetization state of the soft magnetic body is changed, achieving the effect of increasing / decreasing both the speed and the output torque simultaneously.

[0036] Embodiment 2: This example provides a brushless magnetic - field - regulating permanent magnet eddy current coupler. As shown in Figure 6 and Figure 7 , it includes a conductor rotor, a permanent magnet rotor and a rotary magnetic - coupling resonator. The permanent magnet eddy current coupler is arranged axially in sequence according to the conductor rotor, permanent magnet rotor, and rotary magnetic - coupling resonator. The transmitting end of the rotary magnetic - coupling resonator is placed outside the permanent magnet eddy current coupler and remains stationary. The receiving end of the rotary magnetic - coupling resonator is connected to the permanent magnet rotor and rotates synchronously with the permanent magnet rotor to adjust the magnetic field of the low - coercivity permanent magnets on the permanent magnet rotor.

[0037] The conductor rotor is composed of an iron core and a coil. The coil is a flat - wire sector - shaped coil. The permanent magnet rotor is composed of an iron core, low - coercivity permanent magnets AlNiCo, high - coercivity permanent magnets NdFeB, and a magnetic - field - regulating winding. The low - coercivity permanent magnets AlNiCo are embedded between two high - coercivity permanent magnets NdFeB.

[0038] In the rotary magnetic - coupling resonator, the high - frequency inverter power supply is connected to the transmitting end of the magnetic - coupling resonator and remains stationary outside the coupler. The receiving end of the magnetic - coupling resonator is connected to the magnetic - field - regulating winding on the permanent magnet rotor of the coupler through a rotary rectifier and rotates synchronously with the permanent magnet rotor. The transmitting - end coil and the receiving - end coil are placed opposite to each other and keep the relative area unchanged to ensure efficient energy transmission. The receiving end supplies current to the exciting winding on the permanent magnet rotor for magnetic - field regulation through magnetic - field coupling with the transmitting end.

[0039] The magnetic - field - regulating principle is as follows: As shown in Figure 12 , when a reverse current pulse is applied, the permanent magnet working point moves fromP 0 Move to Q 0 , when the pulse disappears, the operating point moves along the recoil line Q 0 P 1 rises and finally stabilizes at the new operating point P 1 on. P 1 The magnetization state is lower than P 0 , at this time, the permanent magnet magnetic flux of AlNiCo is opposite to the permanent magnet magnetic flux of NdFeB, and the air-gap magnetic density decreases; when a positive current pulse is applied, the permanent magnet operating point moves from P 2 Move to R 2 , and then from P 2 Move to R 1 , when the pulse disappears, the operating point moves along the recoil line R 1 P 1 descends and finally stabilizes at the new operating point P 1 on. P 1 The magnetization state is higher than P 2 , at this time, the permanent magnet magnetic flux generated by AlNiCo is the same as the permanent magnet magnetic flux of NdFeB, and the air-gap magnetic density increases. When the air-gap magnetic density changes, the torque of the coupler changes accordingly, thereby realizing the adjustment of the rotational speed.

[0040] In this embodiment, the conductor rotor structure is as shown in Figure 8 .

[0041] In this embodiment, the permanent magnet rotor structure is as shown in Figure 9 .

[0042] In this embodiment, the transmitting end structure of the magnetic coupling resonator is as shown in Figure 10 .

[0043] In this embodiment, the receiving end structure of the magnetic coupling resonator is as shown in Figure 11 .

Claims

1. A method for controlling magnetic field and speed of a brushless magnetic field-adjustable permanent magnet eddy current coupler, characterized in that: The permanent magnet eddy current coupler performs power coupling through the permanent magnet rotor, and adjusts the magnetic force output of the permanent magnet rotor through the magnetic adjustment winding at the permanent magnet rotor. In the control method, the permanent magnet rotor is subjected to memory magnetic adjustment and speed regulation or pole-changing magnetic adjustment and speed regulation through the magnetic adjustment winding. The magnetic adjustment winding is powered by a magnetic coupling resonator. The transmitting end coil and the receiving end coil of the magnetic coupling resonator are placed opposite to each other. The receiving end is connected to the magnetic adjustment winding through a rotating rectifier. The receiving end coil rotates synchronously with the permanent magnet rotor, and the transmitting end coil is statically arranged outside the magnetic coupler.

2. The method for controlling magnetic field and speed of a brushless magnetic field-adjustable permanent magnet eddy current coupler according to claim 1, characterized in that: The magnetic circuit of the permanent magnet rotor is formed by an AlNiCo component and a plurality of NdFeB components adjacent to the AlNiCo component; the receiving end of the magnetic coupling resonator is connected to the magnetic field adjustment winding on the permanent magnet rotor through a rotating rectifier.

3. The magnetic field and speed control method of a brushless magnetic field-adjustable permanent magnet eddy current coupler according to claim 2, characterized in that: In the pole-changing magnetic speed regulation, a multi-permanent magnet pole number mode pole-changing magnetic speed regulation method is adopted, and the magnetic circuits of two adjacent NdFeB components are bypassed in the magnetic circuit of the AlNiCo component, so that the permanent magnet rotor can operate in three permanent magnet pole number modes of 18 poles, 9 poles and 0 poles.

4. The method for controlling magnetic field and speed of a brushless magnetic field-adjustable permanent magnet eddy current coupler according to claim 3 is characterized in that: The receiving end of the magnetic coupling resonator is connected to the magnetic field adjustment winding on the permanent magnet rotor through a rotating rectifier; In the pole-changing magnetic speed regulation, there are three permanent magnet pole number modes of 18 poles, 9 poles and 0 poles, and the switching method of the magnetic winding is: the magnetic winding is divided into two parts, which are connected in series to form phase separation, and controlled by two different relays, and the phase-separated magnetic winding is connected to the rotating rectifier, and the working condition of the magnetic winding of the permanent magnet rotor is switched by controlling the on and off of the two relays, so that the magnetic winding applies corresponding saturation magnetization current pulses or complete demagnetization current pulses to the permanent magnet rotor, so as to realize the operation of the three permanent magnet pole number modes of 18 poles, 9 poles and 0 poles of the coupler.

5. The method for controlling magnetic field and speed of a brushless magnetic field-adjustable permanent magnet eddy current coupler according to claim 1, characterized in that: The magnetic field modulation and speed regulation control method introduces environmental factors such as load conditions, permanent magnet fatigue and temperature influence. By adopting a brushless magnetic field modulation type permanent magnet eddy current coupler composite magnetic field modulation and speed regulation control method, a brushless magnetic field modulation type permanent magnet eddy current coupler is established in three permanent magnet pole number modes of 18 poles, 9 poles and 0 poles and the mechanical characteristic curves of the corresponding limited magnetization state.

6. The method for controlling magnetic field and speed of a brushless magnetic field-adjustable permanent magnet eddy current coupler according to claim 5, characterized in that: The magnetic speed regulation control method divides different torque intervals under the same slip according to the corresponding data of the mechanical characteristic curve. When the load torque that the system can bear needs to be increased while keeping the load speed unchanged, the magnetization intensity of the permanent magnet is increased; when the load torque that the system can bear needs to be reduced while keeping the load speed unchanged, the magnetization intensity of the permanent magnet is reduced.

7. The method for controlling magnetic field and speed of a brushless magnetic field-adjustable permanent magnet eddy current coupler according to claim 5, characterized in that: In the magnetic speed regulation control method, the load torque is divided into constant torque load and parabolic load. The speed regulation range is determined by the intersection of the data corresponding to different loads and the mechanical characteristic curves. According to the load torque type and the torque range to which the load torque belongs, the permanent magnet pole number mode and the corresponding finite magnetization state are selected based on the loss optimization distribution to realize the wide-area and efficient operation of the brushless magnetic speed regulation permanent magnet eddy current coupler.

8. The method for controlling magnetic field and speed of a brushless magnetic field-adjustable permanent magnet eddy current coupler according to claim 7, characterized in that: The permanent magnet rotor includes a soft magnet, and in the magnetic speed control method: for a constant torque load, an excitation current is passed to reduce the magnetization state of the soft magnet to weaken the magnetic force of the permanent magnet, and the working state of the magnetic coupler is within the corresponding magnetic adjustment area to achieve the effect of keeping the output torque unchanged and increasing the speed; an excitation current is passed to increase the magnetization state of the soft magnet to enhance the magnetic force of the permanent magnet, and the working point of the magnetic coupler is within the corresponding magnetic adjustment area to achieve the effect of keeping the speed unchanged and increasing the output torque.

9. The method for controlling magnetic field and speed of a brushless magnetic field-adjustable permanent magnet eddy current coupler according to claim 7, characterized in that: The permanent magnet rotor includes a soft magnet. For a parabolic load, an excitation current is passed to change the magnetization state of the soft magnet, thereby achieving an effect of increasing / decreasing the output torque while increasing / decreasing the rotation speed.

10. The method for controlling magnetic field and speed of a brushless magnetic field-adjustable permanent magnet eddy current coupler according to claim 1, characterized in that: The transmitting end in the magnetic coupling resonator is connected to a high-frequency inverter power supply. The transmitting end is installed outside the magnetic coupler and remains stationary. The receiving end is connected to the magnetic tuning winding on the permanent magnet rotor through a rotating rectifier and rotates synchronously with the permanent magnet rotor. The transmitting end coil and the receiving end coil in the magnetic coupling resonator are placed opposite to each other and keep the relative area unchanged to ensure efficient energy transmission.

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