Ring-shaped field-adjusting winding memory motor and field-adjusting method

Abstract

The present invention provides a ring-shaped magnetic flux memory motor and magnetic flux method, comprising a stator core; an AC armature winding placed on the stator core; a ring-shaped magnetic flux winding placed on the stator core; a rotor core; a variable flux permanent magnet placed on the rotor core; a constant flux permanent magnet placed on the rotor core; and a rotating shaft. The stator core is provided with a plurality of axial stator slots facing the air gap for accommodating a plurality of AC armature winding coils; the stator core is also provided with an annular stator slot facing the air gap for accommodating a DC ring-shaped magnetic flux memory motor; the rotor core of the motor is divided into two sections along the axial direction, with variable flux permanent magnets and constant flux permanent magnets arranged at intervals placed on the cores at both ends. The ring-shaped magnetic flux memory motor of the present invention is loaded with forward or reverse DC current pulses to change the magnetization state of the variable flux permanent magnet, thereby adjusting the air gap magnetic field strength.

Description

Technical Field

[0001] The present invention relates to the field of permanent magnet synchronous motor equipment, and in particular to a ring-shaped magnetic-regulating winding memory motor and a magnetic-regulating method. Background Art

[0002] Permanent magnet synchronous motors (PMSMs) use high-performance rare earth permanent magnet materials to improve efficiency, power density, power factor, and design freedom, and have become a key research topic in high-performance motor drive systems. However, the inherent permanent magnetic field of PMSMs is strong and difficult to adjust, significantly limiting the motor's operating speed range. This also results in high fault currents during high-speed operation and field-weakening faults, reducing fault tolerance. In motor drive systems requiring a wide speed range and high fault tolerance, such as electric vehicle drive motors, aircraft generators, and machine tool spindle motors, the motors are expected to maintain high efficiency, high torque, fast dynamic response, and rapid fault demagnetization over a wide speed range. This requires the motor to be able to flexibly adjust the no-load air gap magnetic field under different operating conditions. Although advances in vector control theory and power electronics technology have enabled magnetic field adjustment in PMSMs by applying a direct-axis armature current, the continuous application of the magnetic field adjustment current generates additional copper loss and reactive current, reducing motor efficiency and power factor, thereby diminishing the advantages of PMSMs.

[0003] To address this issue, the variable flux memory motor structure was proposed in 2001. Its basic structure is similar to that of an ordinary permanent magnet synchronous motor, including an AC armature winding placed on the stator core and a permanent magnet placed on the rotor core. However, compared to traditional permanent magnet synchronous motors, variable flux memory motors use special variable flux permanent magnets, whose magnetization state can be changed by loading current pulses, and the magnetization state can be memorized and maintained after the current pulse ends. In this way, by loading current pulses of different properties, the magnetization state of the permanent magnet can be flexibly enhanced or weakened, so that it maintains a strong magnetization state when high torque output is required, and maintains a weak magnetization state when high speed output is required, thereby allowing the motor to maintain high performance output over a wide speed operating range.

[0004] However, the traditional variable flux memory motor uses AC armature windings to load direct-axis pulse current to complete the magnetization state adjustment of the variable flux permanent magnet. This armature direct-axis pulse current will occupy the AC armature winding and inverter capacity, affecting the torque output function of the motor when loading the pulse current; more importantly, the amplitude of the armature direct-axis pulse current for completing the magnetization state adjustment of the variable flux permanent magnet generally significantly exceeds the rated current amplitude of the motor, which makes it difficult to effectively adjust the magnetic field of the variable flux memory motor.

[0005] In the 2011 academic paper "Principle of Hybrid Variable-Magnetic-Force Motors," the authors proposed a method for achieving magnetic field regulation in a variable flux memory motor using a specialized annular magnetic-force winding. The motor comprises a stator core, an AC armature winding embedded within the stator core, and a DC annular magnetic-force winding. The rotor core is divided into two axial segments with a gap between them. Constant-flux permanent magnets, magnetized radially, are placed on the two core segments to form the rotor poles, while variable-flux permanent magnets, magnetized axially, are placed between the two rotor core segments. In this way, by applying DC current pulses to the annular magnetic-force winding, the motor's magnetic field can be regulated. However, it should be noted that the variable-flux permanent magnet in this technical solution consists of only one axially magnetized permanent magnet, resulting in limited magnetic regulation capabilities. The constant-flux permanent magnets only produce a single pole of one polarity in any core segment, forming an alternating-pole structure.

[0006] In the academic paper "Consequent-Pole Permanent-Magnet Machine With Extended Field-Weakening Capability," published in 2003, the authors proposed a hybrid excitation motor structure that utilizes a specialized annular magnetic field winding to achieve air gap magnetic field regulation. The motor comprises a stator core, an AC armature winding embedded in the stator core, and a DC annular magnetic field winding. The rotor core is divided into two sections along the axial direction. Constant-flux permanent magnets, magnetized radially in an alternating-pole configuration, are placed on the two core sections to form the rotor poles. The annular magnetic field winding is loaded with a constant DC current to regulate the air gap magnetic field. It should be noted that the technical solution described does not include variable-flux permanent magnets and falls within the scope of a hybrid excitation motor, rather than a variable-flux memory motor. The DC magnetic field current required to regulate the air gap magnetic field force requires a constant presence, resulting in high copper consumption for motor magnetic field regulation. Once the DC current is removed, the magnetic field regulation energy is lost. Summary of the Invention

[0007] In view of the defects in the prior art, the purpose of the present invention is to provide a ring-shaped magnetic winding memory motor and a magnetic tuning method.

[0008] According to the present invention, a ring-shaped magnetic-adjusting winding memory motor is provided, comprising a stator core, an AC armature winding, a ring-shaped magnetic-adjusting winding, a rotor core, a variable magnetic flux permanent magnet, a constant magnetic flux permanent magnet, and a rotating shaft, wherein:

[0009] The stator core has several axially penetrating stator slots evenly distributed along the circumference on the air gap side for embedding the AC armature winding;

[0010] An annular stator slot is provided on the air gap side at the axial middle position of the stator core to embed the DC annular magnetic winding coil;

[0011] The rotor core is located inside the stator core; the rotor core is divided into an independent first rotor segment core and a second rotor segment core along the axial direction, with a non-magnetic spacer provided between the two;

[0012] The first rotor segment core and the second rotor segment core are both provided with variable flux permanent magnets and constant flux permanent magnets, the two permanent magnets forming magnetic poles with opposite polarities and arranged at intervals along the circumferential direction;

[0013] The rotating shaft is located inside the rotor core and is coaxial with the stator core and the rotor core. The rotating shaft and the rotor core can rotate around the rotating shaft.

[0014] Preferably, the AC armature winding and the annular magnetic tuning winding are independent of each other, the AC armature winding is loaded with AC current, and the annular magnetic tuning winding is loaded with forward or reverse DC current.

[0015] Preferably, the variable flux permanent magnets are placed on two segments of the rotor core to provide radial magnetic fields, which act as different magnetic poles on the two rotor segment cores.

[0016] Preferably, the variable flux permanent magnet is a permanent magnet with adjustable and memorable remanence. After the annular magnetic adjustment winding is loaded with a DC pulse, the remanence of the permanent magnet can be changed, and after the DC pulse current ends, the changed remanence of the permanent magnet can be memorized.

[0017] Preferably, the constant flux permanent magnets are placed on two segments of the rotor core to provide radial magnetic fields, which act as different magnetic poles on the two rotor segment cores.

[0018] Preferably, variable flux permanent magnets and constant flux permanent magnets are placed on the core of the first rotor segment, and the two types of permanent magnets constitute rotor poles respectively, wherein the variable flux permanent magnets constitute S poles and the constant flux permanent magnets constitute N poles, and the two are arranged at intervals along the circumferential direction;

[0019] Variable flux permanent magnets and constant flux permanent magnets are also placed on the core of the second rotor segment. The two types of permanent magnets constitute the rotor poles respectively, where the variable flux permanent magnets constitute the N poles and the constant flux permanent magnets constitute the S poles, and the two are arranged at intervals along the circumferential direction.

[0020] Preferably, the stator core and the rotor core are made of laminated silicon steel sheets; the constant flux permanent magnets are made of neodymium iron boron material, and the variable flux permanent magnets are made of aluminum nickel cobalt material; and the rotating shaft is made of magnetic conductive material.

[0021] Preferably, the constant flux permanent magnet and the variable flux permanent magnet both adopt an embedded V-shaped structure and are placed on the rotor core.

[0022] According to the present invention, a magnetic tuning method based on the above-mentioned ring-shaped magnetic tuning winding memory motor includes the following steps:

[0023] AC current loading step: AC current is loaded into the AC armature winding to complete the electromagnetic power output of the motor. The corresponding main magnetic flux only flows in a two-dimensional plane perpendicular to the axial axis of the motor;

[0024] DC current pulse loading steps: The annular magnetic tuning winding is loaded with a forward or reverse DC current pulse to complete the magnetization state adjustment of the variable flux permanent magnet. The corresponding main magnetic flux flows in three-dimensional space, and the flow path includes the stator core, the first rotor segment core, the shaft, and the second rotor segment core.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The motor described in the present invention has two independent electrical circuits. One electrical circuit is composed of an AC armature winding for applying AC current to output electromagnetic power; the other electrical circuit is composed of a toroidal magnetic field winding for applying DC current pulses to achieve air gap magnetic field regulation. The two electrical circuits are isolated from each other, with flexible design parameters and diverse control methods. The magnetic field tuning current of the toroidal magnetic field winding does not consume the current capacity of the AC armature winding, which helps reduce the capacity of the inverter connected to the AC armature winding.

[0027] 2. The motor of the present invention adjusts the magnetization state of the variable flux permanent magnet on the rotor by loading forward or reverse DC current pulses on the annular magnetic tuning winding, thereby changing the air gap magnetic field strength. This can achieve high-performance operation of the motor within a wide speed range according to working conditions. In addition, the magnetic tuning DC current loading time is very short, and the copper loss during the magnetic tuning process is very small.

[0028] 3. The motor described in the present invention uses both variable flux permanent magnets and constant flux permanent magnets, and the two types of permanent magnets act as different magnetic poles in the two rotor core segments, so that the motor has both a wide magnetic tuning range and high power density. In addition, the same type of permanent magnet is used as magnetic poles of different polarities in the two rotor core segments, which can ensure that the DC current pulses loaded by the annular magnetic tuning winding have a good magnetic tuning effect.

[0029] 4. In any rotor core segment of the motor described in the present invention, the magnetic poles composed of the variable flux permanent magnets and the magnetic poles composed of the constant flux permanent magnets are arranged at intervals, and the two are in a series structure in the magnetic circuit. This can ensure that the operating point of the variable flux permanent magnets is relatively stable and avoid accidental demagnetization.

[0030] 5. The number of phases, number of poles and slots, AC armature winding type, and rotor permanent magnet type of the motor of the present invention are flexible and diverse, so that the annular magnetic-switching winding memory motor of this case has a wide range of adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0032] FIG1( a ) is a schematic diagram of a three-dimensional structure of a quarter model of a ring-shaped magnetic-switching winding memory motor according to one embodiment of the present invention.

[0033] FIG1( b ) is a schematic diagram of the transverse cross-sectional structure of a 1 / 4 model of the corresponding two rotor core segments.

[0034] Figure 2 The figure is a schematic diagram of the magnetic flux flow direction and magnetic regulation principle of a ring-shaped magnetic regulation winding memory motor according to one embodiment of the present invention.

[0035] Figure 3 The figure shows the no-load back electromotive force waveform of a ring-shaped magnetic-modulation winding memory motor described in one embodiment of the present invention after the ring-shaped magnetic-modulation winding is loaded with a forward DC current pulse and a reverse DC current pulse.

[0036] The figure shows:

[0037] Stator core 1

[0038] AC armature winding 2

[0039] Ring magnetic winding 3

[0040] Rotor core 4

[0041] The first rotor core segment 41

[0042] The second rotor core segment 42

[0043] Constant flux permanent magnet 5

[0044] First constant flux permanent magnet 51

[0045] Second constant flux permanent magnet 52

[0046] Variable flux permanent magnet 6

[0047] First variable flux permanent magnet 61

[0048] Second variable flux permanent magnet 62

[0049] Reel 7 DETAILED DESCRIPTION

[0050] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0051] Figure 1(a) is a schematic diagram of the three-dimensional structure of a quarter-scale model of a ring-shaped magnetic-switching winding memory motor according to this embodiment of the present invention; Figure 1(b) is a schematic diagram of the transverse cross-sectional structure of a quarter-scale model of two corresponding rotor core segments. This embodiment of the present invention is a three-phase stator with 48 slots and a rotor with 8 poles. Due to the motor's symmetry, a quarter-scale model is sufficient to illustrate the key features of this embodiment of the motor. As shown in the figure, this embodiment of the motor includes a stator core 1, an AC armature winding 2, a ring-shaped magnetic-switching winding 3, a rotor core 4, constant-flux permanent magnets 5, variable-flux permanent magnets 6, and a rotating shaft 7. The stator core 1 is provided with a plurality of axially through stator slots along the axial direction, and the stator slots are axially through and used to place the AC armature winding 2; the stator core 1 is provided with an annular stator slot at the axial center position for placing the annular armature winding 3; the rotor core 4 is located inside the stator core 1 and is divided into two independent rotor core segments along the axial direction, namely the first rotor core segment 41 and the second rotor core segment 42, with an axial non-magnetic conductive spacer provided between the two; and the axial length of the non-magnetic conductive spacer is equivalent to the axial length of the stator annular slot; the first rotor core segment 41 is evenly placed with a first constant magnetic flux permanent magnet 51 and a first variable magnetic flux permanent magnet 61, and the two permanent magnets are separately The rotor core 4 has two parts, one of which is a stator core 1 and the other is a rotor core 4. The stator core 4 has two parts, the other is a stator core 1 and the other is a rotor core 4. The stator core 4 has two parts, the other is a stator core 1 and the other is a rotor core 4. The stator core 4 has two parts, the other is a stator core 1 and the other is a rotor core 4. The stator core 4 has two parts, the other is a stator core 1 and the other is a rotor core 4. The stator core 4 has two parts, the other is a stator core 1 and the other is a rotor core 4. The stator core 4 has two parts, the other is a stator core 1 and the other is a rotor core 4. The stator core 4 has two parts, the other is a stator core 1 and the other is a rotor core 4. The stator core 4 has two parts, the other is a stator core 1 and the other is a rotor core 4.

[0052] Specifically, the stator core 1 and rotor core 4 of the motor of this embodiment are made of laminated silicon steel sheets; the constant flux permanent magnet 5 is made of neodymium iron boron material, and the variable flux permanent magnet 6 is made of aluminum nickel cobalt material. Both permanent magnets are used to generate radial magnetic flux; the rotating shaft 7 is made of magnetic conductive material.

[0053] The constant flux permanent magnets 5 and variable flux permanent magnets 6 of the motor of this embodiment both adopt an embedded V-shaped structure and are placed on the rotor core 4. On the first rotor core segment 41, the first constant flux permanent magnet 51 constituting the north pole and the first variable flux permanent magnet 61 constituting the south pole are connected in series magnetically. The first constant flux permanent magnet 51 helps stabilize the operating point of the first variable flux permanent magnet 61, preventing accidental demagnetization. On the second rotor core segment 42, the second constant flux permanent magnet 52 constituting the south pole and the second variable flux permanent magnet 62 constituting the north pole are connected in series magnetically. The second constant flux permanent magnet 52 helps stabilize the operating point of the second variable flux permanent magnet 62, preventing accidental demagnetization. Furthermore, at a certain rotor circumferential position, the north pole on the first rotor core segment 41 is formed by the first constant flux permanent magnet 51, while the north pole on the second rotor core segment 42 at the same rotor circumferential position is formed by the second variable flux permanent magnet 62. At another rotor circumferential position rotated 45 degrees, the south pole on the first rotor core segment 41 is formed by the first variable flux permanent magnet 61, while the south pole on the second rotor core segment 42 at the same rotor circumferential position is formed by the second constant flux permanent magnet 52. In this way, the magnetic poles formed by the constant flux permanent magnets 5 and the variable flux permanent magnets 6 are both arranged at intervals within a single rotor core segment and alternately placed between two rotor core segments.

[0054] The AC armature winding 2 and the annular magnetic-tuning winding 3 are independent of each other. The AC armature winding 2, similar to the armature winding of a conventional AC motor, consists of multiple coils. The current in the windings within the stator core flows parallel to the axis of the motor shaft. When loaded with AC current, the AC armature winding 2 can output motor power, thereby converting the motor's mechanical energy into electrical energy, i.e., outputting electromagnetic power. The annular magnetic-tuning winding 3, on the other hand, consists of only one coil, located at the axial center of the stator core. The current within the coil flows in a plane perpendicular to the axis of the motor shaft. Accordingly, the annular magnetic-tuning winding 3 is loaded with forward or reverse DC current to adjust the magnetization state of the variable-flux permanent magnets, thereby changing the air gap magnetic field strength of the motor. Specifically, the AC armature winding 2 of the motor in this embodiment is loaded with three-phase symmetrical AC current, which interacts with the radial magnetic flux generated by the constant-flux permanent magnets 5 and the variable-flux permanent magnets 6 on the rotor core, outputting electromagnetic power, thereby converting the motor's mechanical energy into electrical energy. The annular magnetic adjustment winding 3 of the motor of this embodiment is loaded with a forward or reverse DC current pulse, thereby generating a three-dimensional magnetic field including radial magnetic flux and axial magnetic flux, increasing or decreasing the remanence of the variable flux permanent magnet 6, and thereby changing the no-load air gap magnetic field strength of the motor. The corresponding magnetic flux flow path is a three-dimensional path, and the flow path includes the stator core, two sections of the rotor core and the rotating shaft. After the DC current pulse ends, the remanence of the variable flux permanent magnet 6 after adjustment is memorized and retained. Specifically, the remanence of the variable flux permanent magnet 6 is adjustable and memorizable. By loading the annular magnetic adjustment winding with a DC current pulse, the remanence of the variable flux permanent magnet can be changed, and after the DC pulse current ends, the remanence of the changed variable flux permanent magnet can be memorized. In this way, the remanence state of the variable flux permanent magnet and the corresponding no-load air gap magnetic field strength can be flexibly adjusted according to different operating conditions of the motor. When a stronger air gap magnetic field is needed to improve the torque output capacity, a forward DC current pulse is loaded in the annular magnetic tuning winding to increase the remanence of the variable flux permanent magnet, enhance the air gap magnetic field, and achieve high torque output; when a weaker air gap magnetic field is needed to expand the high-speed operation capability, a reverse DC current pulse is loaded in the annular magnetic tuning winding to reduce the remanence of the variable flux permanent magnet, weaken the air gap magnetic field, and achieve high-speed operation.

[0055] The constant flux permanent magnets 5 are magnetized radially and placed on the two segments of the rotor core. They act as different magnetic poles on the two rotor segment cores, such as all acting as N poles on the first rotor segment core and all acting as S poles on the second rotor segment core. The variable flux permanent magnets 6 are magnetized radially and placed on the two segments of the rotor core. They act as different magnetic poles on the two rotor segment cores, such as all acting as S poles on the first rotor segment core and all acting as N poles on the second rotor segment core.

[0056] More specifically, the motor of the present invention offers flexible and diverse number of phases and stator and rotor slots, and the number or form of these can be adjusted based on the specific circumstances of each implementation. The AC armature winding structure can be either distributed or centralized. The permanent magnets placed on the rotor core can be surface-mounted or embedded. The axial lengths of the two rotor core segments can be the same or different, and the shapes and sizes of the permanent magnets placed on the two rotor core segments can be the same or different.

[0057] Further references Figure 2 The three-dimensional magnetic field flow direction when the annular magnetic field winding 3 is loaded with a positive DC current pulse can be seen, which further explains the magnetic field mechanism of the motor. At this time, the magnetic field flow path is connected as shown by the arrow, flowing radially from the stator core portion corresponding to the first rotor core segment 41 toward the air gap side, passing through the air gap and entering the first rotor core segment 41. The magnetic flux flow direction is the same as the magnetization direction of the variable flux permanent magnet pole 61. Furthermore, the magnetic flux flows axially through the shaft and then radially outward through the first rotor core segment 42. At this time, the magnetic field flow direction is the same as the magnetization direction of the variable flux permanent magnet pole 62. Next, the magnetic field flows radially outward through the air gap and enters the stator core, forming a closed loop. It can be seen that the magnetic field passes through a three-dimensional magnetic circuit including radial and axial directions. The direction of the magnetic field is consistent with the direction of the variable flux permanent magnet poles 61 and 62, which plays a magnetizing role, improves the magnetization state of the variable flux permanent magnet 6, and helps to enhance the no-load air gap magnetic field.

[0058] If a reverse DC current pulse is applied to the annular magnetic-tuning winding 3, the path of the three-dimensional magnetic-tuning magnetic field is the same as when a forward DC current pulse is applied, but in the opposite direction. Accordingly, the direction of the magnetic-tuning magnetic field is opposite to the magnetization direction of the variable-flux permanent magnet poles 61 and 62, thus acting as a demagnetizer, reducing the magnetization state of the variable-flux permanent magnet 6 and helping to weaken the no-load air gap magnetic field.

[0059] In summary, it can be seen that by loading a forward or reverse DC current pulse on the annular magnetic tuning winding 3 , the magnetization state of the variable flux permanent magnet can be effectively changed to achieve air gap magnetic field regulation.

[0060] In order to better illustrate the implementation effect of this case, Figure 3 This diagram schematically illustrates the no-load AC armature winding back EMF waveforms of a memory motor with a ring-shaped field-tuning winding, described in this embodiment, after the ring-shaped field-tuning winding is loaded with forward and reverse DC current pulses. It can be seen that the no-load AC back EMF amplitude of the motor changes significantly after the ring-shaped field-tuning winding is loaded with DC pulses of different directions, demonstrating a good field-tuning effect.

[0061] The present invention addresses the shortcomings of the prior art by providing an independent annular magnetic tuning winding on the stator. Variable-flux permanent magnets and constant-flux permanent magnets are interlaced on two isolated rotor core segments to form the rotor's north pole and rotor's south pole, respectively. By applying positive or reverse DC current pulses to the annular magnetic tuning winding, the magnetization state of the variable-flux permanent magnets can be altered, thereby achieving air gap magnetic field regulation. The DC magnetic tuning current pulses are applied only to the annular magnetic tuning winding, providing flexible and convenient magnetic tuning. The magnetic tuning current is independent of the AC armature winding and does not affect the motor's AC current capacity. Furthermore, the variable-flux permanent magnets and constant-flux permanent magnets are both radially magnetized and distributed across the two rotor core segments, ensuring the motor has excellent power density and magnetic tuning range.

[0062] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0063] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A ring-shaped magnetic winding memory motor, characterized in that: It includes a stator core, an AC armature winding, a ring-shaped magnetic winding, a rotor core, a variable flux permanent magnet, a constant flux permanent magnet and a rotating shaft, wherein: The stator core has several axially penetrating stator slots evenly distributed along the circumference on the air gap side for embedding the AC armature winding; An annular stator slot is provided in the axial middle position of the stator core to accommodate the DC annular magnetic winding coil; The rotor core is located inside the stator core; the rotor core is divided into an independent first rotor segment core and a second rotor segment core along the axial direction, with a non-magnetic spacer provided between the two; The first rotor segment core and the second rotor segment core are both provided with variable flux permanent magnets and constant flux permanent magnets, the two permanent magnets forming magnetic poles with opposite polarities and arranged at intervals along the circumferential direction; The first rotor segment core is provided with a variable flux permanent magnet and a constant flux permanent magnet. The two permanent magnets constitute rotor magnetic poles respectively. The variable flux permanent magnet constitutes the S pole and the constant flux permanent magnet constitutes the N pole. The two permanent magnets are arranged at intervals along the circumferential direction. The second rotor segment core is also provided with variable flux permanent magnets and constant flux permanent magnets. The two types of permanent magnets constitute rotor magnetic poles, with the variable flux permanent magnets constituting the N poles and the constant flux permanent magnets constituting the S poles. The two types of permanent magnets are arranged circumferentially at intervals. The rotating shaft is located inside the rotor core and is coaxial with the stator core and the rotor core. The rotating shaft and the rotor core can rotate around the rotating shaft.

2. The ring-shaped magnetic winding memory motor according to claim 1, characterized in that: The AC armature winding and the annular magnetic modulation winding are independent of each other. The AC armature winding is loaded with an AC current; the annular magnetic modulation winding is loaded with a forward or reverse DC current.

3. The ring-shaped magnetic winding memory motor according to claim 1, characterized in that: The variable flux permanent magnets are placed on two segments of the rotor core to provide radial magnetic fields, which act as different magnetic poles on the two rotor segment cores.

4. The ring-shaped magnetic winding memory motor according to claim 1, characterized in that: The variable flux permanent magnet is a permanent magnet with adjustable and memorable remanence. After the annular magnetic adjustment winding is loaded with a DC pulse, the remanence of the variable flux permanent magnet can be changed, and after the DC pulse current ends, the changed remanence of the variable flux permanent magnet can be memorized.

5. The ring-shaped magnetic winding memory motor according to claim 1, characterized in that: The constant flux permanent magnets are placed on two segments of the rotor core, providing a radial magnetic field that acts as different magnetic poles on the two rotor segment cores.

6. The ring-shaped magnetic winding memory motor according to claim 1, characterized in that: The stator core and the rotor core are made of laminated silicon steel sheets; the constant flux permanent magnets are made of neodymium iron boron material, and the variable flux permanent magnets are made of aluminum nickel cobalt material; and the rotating shaft is made of magnetic conductive material.

7. The magnetic tuning method of the ring-shaped magnetic tuning winding memory motor according to any one of claims 1 to 6, characterized in that: The steps include: AC current loading step: AC current is loaded into the AC armature winding to complete the electromagnetic power output of the motor. The corresponding main magnetic flux only flows in a two-dimensional plane perpendicular to the axial axis of the motor; DC current pulse loading steps: The annular magnetic tuning winding is loaded with a forward or reverse DC current pulse to complete the magnetization state adjustment of the variable flux permanent magnet. The corresponding main magnetic flux flows in three-dimensional space, and the flow path includes the stator core, the first rotor segment core, the shaft, and the second rotor segment core.

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