Series-parallel variable flux permanent magnet memory motor

Abstract

The invention discloses a series-parallel variable flux permanent magnet memory motor, which comprises a stator, an armature winding, a hybrid permanent magnet rotor and a non-magnetic rotating shaft, the stator comprises a plurality of stator yokes and iron core teeth arranged at the end parts of the stator yokes, armature windings are wound on the iron core teeth, the plurality of iron core teeth are encircled to form a circular hollow area, the hybrid permanent magnet rotor is arranged in the hollow area, the non-magnetic rotating shaft is arranged at the central position of the hollow area, and the hybrid permanent magnet rotor rotates around the non-magnetic rotating shaft. The problem that the size design of the permanent magnet is limited by the spatial position is effectively solved, the demagnetization resistance of the low-coercive-force permanent magnet and the flux weakening capacity of the motor are improved, multi-stage flux adjustment under different working conditions can be achieved, and the magnetic adjustment range is wider.

Description

Technical Field

[0001] The invention relates to the field of permanent magnet memory motors, and in particular to a series-parallel variable magnetic flux permanent magnet memory motor. Background Art

[0002] With the rapid development of power electronics technology and high-performance rare earth materials, permanent magnet synchronous motors have been widely used in various industrial applications such as electric vehicles, air compressors, and aerospace due to their advantages of high power density, high efficiency, reliable operation, and strong overload capacity. However, due to the inherent characteristics of traditional high-performance permanent magnet materials (such as NdFeB), the air gap magnetic field in ordinary permanent magnet synchronous motors (PMSMs) remains basically constant, and the speed regulation range is very limited during electric operation. The application in wide speed regulation direct drive occasions such as electric vehicles and aerospace is subject to certain restrictions. Therefore, the adjustable flux permanent magnet motor, which aims to achieve effective regulation of the air gap magnetic field of the permanent magnet motor, has always been a hot spot and difficulty in the field of motor research.

[0003] In order to achieve a wider speed regulation range, the traditional method is to apply weak magnetic current to expand the speed regulation range of the motor, thereby expanding the constant power range. However, this method of continuously applying weak magnetic current will greatly increase the copper loss of the motor, causing the efficiency of the motor in the high speed operation range to drop significantly. The variable flux permanent magnet memory motor (hereinafter referred to as "memory motor") is a new type of flux controllable permanent magnet motor. It uses low coercive force AlNiCo permanent magnets to generate circumferential magnetic fields through stator windings or DC pulse windings, thereby changing the magnetization intensity of the permanent magnets and adjusting the air gap magnetic field. It does not require complex weak magnetic control methods and excessive excitation losses to obtain an ideal wide constant power range. Therefore, the memory motor can be used as a better choice for permanent magnet synchronous motors. Most of the existing research focuses on AC magnetic modulation hybrid permanent magnet memory motors. Two permanent magnets of different materials are co-excited inside the rotor, in which NdFeB permanent magnets provide the main magnetic field of the air gap, while AlNiCo permanent magnets play the role of magnetic field regulation. The stator winding has both power control and magnetic modulation functions.

[0004] The prior art proposes a rotor core and a motor of a magnetic circuit parallel type permanent magnet motor. The motor adopts a traditional parallel magnetic circuit structure. Since the coercive force of the AlNiCo permanent magnet is not high enough, it is easy to be greatly reversely demagnetized by the NdFeB permanent magnet under no-load conditions. In the traditional parallel magnetic circuit type memory motor, the magnetic circuit is usually fixed, which means that the regulation of the magnetic flux mainly depends on the magnetization state of the permanent magnet. This structure limits the flexibility of the magnetic flux regulation, thereby affecting the magnetic regulation range. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a series-parallel variable flux permanent magnet memory motor to achieve multi-stage flux regulation under different working conditions and have a wider magnetic regulation range.

[0006] Technical solution: The series-parallel variable flux permanent magnet memory motor described in the present invention includes a stator, an armature winding, a hybrid permanent magnet rotor and a non-magnetic rotating shaft; the stator includes a plurality of stator yokes and iron core teeth arranged at the ends of the stator yokes, the armature windings are wound on the iron core teeth, and the plurality of iron core teeth surround a circular hollow area, a hybrid permanent magnet rotor is arranged in the hollow area, the center position of the hollow area is the non-magnetic rotating shaft, and the hybrid permanent magnet rotor rotates around the non-magnetic rotating shaft.

[0007] Furthermore, the hybrid permanent magnet rotor includes a rotor core, a second permanent magnet, a first permanent magnet, and a third permanent magnet. The first permanent magnets are respectively arranged on the top, bottom, left and right of the hybrid permanent magnet rotor. Each first permanent magnet is arranged with two second permanent magnets and one third permanent magnet. The second permanent magnets on two adjacent first permanent magnets are connected, and the third permanent magnet on the first permanent magnet is connected to the non-magnetic shaft to form an "octagonal" structure. The magnets are connected by magnetic barriers, and the entire "octagonal" structure is embedded in the rotor core.

[0008] Furthermore, the magnetic barrier includes a trapezoidal magnetic barrier, an arc-shaped magnetic barrier and a triangular magnetic barrier. The trapezoidal magnetic barrier is used to connect the first permanent magnet and the second permanent magnet, the arc-shaped magnetic barrier is used to connect the two second permanent magnets, and the triangular magnetic barrier is used to connect the third permanent magnet and the non-magnetic rotating shaft.

[0009] Furthermore, the ends of the second permanent magnet away from the non-magnetic rotating shaft are respectively arranged in an eight-shaped shape close to the bottom of the first permanent magnet, with the opening facing the rotating shaft.

[0010] Furthermore, the third permanent magnet is perpendicular to the first permanent magnet and is arranged in a T-shape with the first permanent magnet.

[0011] Furthermore, the first permanent magnet, the second permanent magnet and the third permanent magnet form a double-layer permanent magnet structure, which are in a series-parallel relationship under the magnetic circuit magnetization working condition, and in a series or series-parallel relationship under the magnetic weakening working condition.

[0012] Furthermore, under the magnetization condition, each third permanent magnet and the second permanent magnet are magnetized in the same clockwise or counterclockwise direction along the width direction of their permanent magnet blocks, and the magnetization directions of two adjacent second permanent magnets are alternately clockwise and counterclockwise, and the magnetization direction of the first permanent magnet is tangential magnetization, which is the same as the magnetization direction of the third permanent magnet and the second permanent magnet, which is clockwise or counterclockwise.

[0013] Furthermore, the speed regulation under the weak magnetic condition is divided into three levels, namely the first level magnetic regulation condition, the second level magnetic regulation condition and the third level magnetic regulation condition. Under the first level magnetic regulation condition, the magnetization directions of the first permanent magnet and the second permanent magnet are both clockwise or counterclockwise, and the third permanent magnet and the first permanent magnet are tangentially magnetized in opposite directions. At this time, the first permanent magnet and the third permanent magnet respectively work in the forward magnetization and reverse weak magnetic conditions.

[0014] Furthermore, under the second-stage magnetic modulation condition, the magnetization directions of the second permanent magnet and the third permanent magnet are both clockwise or counterclockwise, and the first permanent magnet and the third permanent magnet are tangentially magnetized in opposite directions. At this time, the first permanent magnet and the third permanent magnet respectively work in reverse weak magnetic field and forward magnetization conditions.

[0015] Furthermore, under the third-level magnetic modulation condition, the magnetization directions of the first permanent magnet and the third permanent magnet are both clockwise or counterclockwise, and are clockwise or counterclockwise in the opposite direction to the second permanent magnet. The first permanent magnet and the third permanent magnet operate in a reverse weak magnetic condition.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0017] (1) When the motor is in the magnetization working condition, the magnetization direction of the first permanent magnet and the third permanent magnet is tangential magnetization, and when the magnetization direction of the second permanent magnet is the same as that of the clockwise or counterclockwise direction, the permanent magnetic flux generated by the first permanent magnet, the second permanent magnet and the third permanent magnet all flow into the stator through the air gap, and the first permanent magnet and the third permanent magnet partially form a parallel magnetic circuit with the second permanent magnet, while the third permanent magnet partially forms a series magnetic circuit with the second permanent magnet, thereby increasing the air gap magnetic density of the motor and improving the torque output capacity of the motor;

[0018] (2) When the motor is in a weak magnetic condition, three-level magnetic adjustment can be achieved. In the first level magnetic adjustment condition, the magnetizing directions of the first permanent magnet and the second permanent magnet are both clockwise or counterclockwise, and the third permanent magnet is tangentially magnetized in the opposite direction to the first permanent magnet. At this time, the first permanent magnet and the third permanent magnet respectively work in positive magnetization and reverse weak magnetic conditions; in the second level magnetic adjustment condition, the magnetizing directions of the second permanent magnet and the third permanent magnet are both clockwise or counterclockwise, and the first permanent magnet and the third permanent magnet are tangentially magnetized in the opposite direction. At this time, the first permanent magnet and the third permanent magnet respectively work in reverse weak magnetic conditions and positive magnetization conditions; in the third level magnetic adjustment condition, the magnetizing directions of the first permanent magnet and the third permanent magnet are both clockwise or counterclockwise, and are clockwise or counterclockwise in the opposite direction to the second permanent magnet. The first permanent magnet and the third permanent magnet both work in reverse weak magnetic conditions. Under the first-stage magnetic modulation working condition, a part of the permanent magnet flux flows into the air gap and the stator through the second permanent magnet and the third permanent magnet, forming a parallel magnetic circuit with the other part of the flux flowing into the air gap and the rotor through the first permanent magnet; under the second and third-stage magnetic modulation working conditions, a part of the permanent magnet flux passes through the first permanent magnet and the second permanent magnet to form a series magnetic circuit inside the rotor core, and the other part flows into the stator through the second permanent magnet and the air gap. These three magnetization methods can flexibly change the air gap magnetic density of the motor according to the speed regulation requirements of the working conditions, greatly broadening the speed regulation range of the motor and making the motor have a wider magnetic modulation range;

[0019] (3) By arranging the second permanent magnets on both sides below the wide body permanent magnets of the first permanent magnets of each pole, the risk of accidental demagnetization of the second permanent magnets due to the influence of the magnetization current is reduced, and the demagnetization resistance of the permanent magnets is improved;

[0020] (4) The series-parallel magnetic circuit structure is very simple, avoiding rotor space congestion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is the distribution diagram of magnetizing magnetic lines of force of the motor;

[0023] Figure 3 This is the magnetic field line distribution diagram of the motor in the first-stage weak magnetic condition;

[0024] Figure 4 This is the magnetic field line distribution diagram of the motor's second-stage weak magnetic condition;

[0025] Figure 5 This is the magnetic field line distribution diagram of the motor in the third-stage weak magnetic condition;

[0026] Figure 6 The air gap magnetic flux density diagram of the motor magnetization condition;

[0027] Figure 7 It is the air gap magnetic flux density diagram of the first-stage weak magnetic condition of the motor;

[0028] Figure 8 It is the air gap magnetic flux density diagram of the second-stage weak magnetic condition of the motor;

[0029] Fig. 9 It is the air gap magnetic flux density diagram of the third-level weak magnetic condition of the motor;

[0030] Fig.10 Another structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0032] like Figure 1As shown, the variable flux permanent magnet memory motor of the present invention comprises a stator 1, an armature winding 2, a hybrid permanent magnet rotor 3 and a non-magnetic shaft 4. The motor structure comprises a non-magnetic shaft 4, a composite permanent magnet rotor 3 and a stator 1 from the inside to the outside. The stator 1 is further composed of stator core teeth 11 and a stator yoke 12, wherein the stator core teeth 11 are located between the stator yoke 12 and the composite permanent magnet rotor 3. The adjacent space between these stator core teeth 11 is used to install the three-phase armature windings 2, which are wound on the stator core teeth 11. The rotor core 31 of the hybrid permanent magnet rotor 3 is arranged around the outside of the non-magnetic shaft 4. Two tangentially magnetized first permanent magnets 33 and two second permanent magnets 32 are arranged under each pole of the rotor core 31. The first permanent magnet 33 is placed in a straight line near the air gap side. The third permanent magnet 34 is perpendicular to the first permanent magnet 33 and placed in a T-shape with the first permanent magnet 33. The ends of the two second permanent magnets 32 away from the shaft 4 are respectively placed in an eight-shaped shape near the bottom of the first permanent magnet 33, with the opening facing the shaft direction. The first permanent magnet 33, the second permanent magnet 32, and the third permanent magnet 34 form a double-layer permanent magnet structure. The first permanent magnet 33, the second permanent magnet 32, and the third permanent magnet 34 are in a series-parallel relationship under the magnetization condition of the magnetic circuit, and in a series or series-parallel relationship under the weak magnetic condition. There is a trapezoidal magnetic barrier 35 between the first permanent magnet 33 and the figure-eight second permanent magnet 32, an arc-shaped magnetic barrier 36 between each two adjacent poles of the second permanent magnet 32, and a triangular magnetic barrier is provided near the end of the rotating shaft of the third permanent magnet 34. The second permanent magnets 32 under the same pole are symmetrically arranged about the central axis of the first permanent magnet 33 and the third permanent magnet 34, and the central axis of the first permanent magnet 33 coincides with the central axis of the third permanent magnet 34. The trapezoidal magnetic barrier 35 and the arc-shaped magnetic barrier 36 are symmetrically arranged with the central axis of the first permanent magnet, and the triangular magnetic barrier 37 coincides with the central axis of the first permanent magnet 33. The three types of magnetic barriers are arranged to reduce the influence of magnetic leakage.

[0033] In the magnetizing condition, each third permanent magnet 34 and the second permanent magnet 32 ​​are magnetized in the same clockwise or counterclockwise direction along the width direction of the permanent magnet block, and the magnetizing directions of the two adjacent second permanent magnets 32 are alternately clockwise and counterclockwise, and the magnetizing direction of the first permanent magnet 33 is tangential magnetization, and the magnetizing directions of the third permanent magnet 34 and the second permanent magnet 32 ​​are the same clockwise or counterclockwise. In the weak magnetic condition, the speed regulation is divided into three levels. In the first level of magnetizing condition, the magnetizing directions of the first permanent magnet 33 and the second permanent magnet 32 ​​are the same clockwise or counterclockwise, and the third permanent magnet 34 and the first permanent magnet 33 are tangentially magnetized in opposite directions. At this time, the first permanent magnet 33 and the third permanent magnet 34 work in the positive magnetizing and reverse weak magnetic conditions respectively; in the second level of magnetizing condition, the magnetizing directions of the second permanent magnet 32 ​​and the third permanent magnet 34 are the same clockwise or counterclockwise. The first permanent magnet 33 and the third permanent magnet 34 are tangentially magnetized in opposite directions. At this time, the first permanent magnet 33 and the third permanent magnet 34 work in reverse weak magnetic and positive magnetization conditions respectively; under the third-level magnetic adjustment condition, the magnetization directions of the first permanent magnet 33 and the third permanent magnet 34 are both clockwise or counterclockwise, and are clockwise or counterclockwise in the opposite direction to the second permanent magnet 32. The first permanent magnet 33 and the third permanent magnet 34 both work in reverse weak magnetic conditions. The number of first permanent magnets 33 is four, the number of second permanent magnets 32 is eight, the number of third permanent magnets 34 is four, the number of trapezoidal magnetic barriers 35 is eight, and the number of arc-shaped magnetic barriers 36 and triangular magnetic barriers 37 are both four. The first permanent magnet 33 and the third permanent magnet 34 are both aluminum nickel cobalt permanent magnets, and the second permanent magnet 32 ​​is neodymium iron boron permanent magnets.

[0034] Another structure described in the present invention is as follows Fig.10 As shown, the first permanent magnet 33 is no longer a whole piece of AlNiCo permanent magnet, but is divided into two smaller AlNiCo permanent magnets, and the rest of the parts remain unchanged. The two separated smaller AlNiCo permanent magnets reduce the usage of AlNiCo material of the first permanent magnet, reduce the cost, and ensure variable magnetic flux, while ensuring similar magnetization and weakening. In this embodiment, except that the number of the first permanent magnets 33 is eight, the rest of the numbers remain unchanged.

[0035] The operating principle of the variable flux permanent magnet memory motor of the present invention is as follows: a part of the permanent magnetic flux first starts from the north pole of the second permanent magnet 32 ​​arranged in the middle of the rotor core 31, passes through the air gap, reaches the stator core tooth 11, then passes through the stator yoke 12, reaches the south pole of the second permanent magnet 32, and finally passes through the third permanent magnet 34; the other part starts from the north pole of the first permanent magnet 33 arranged on the air gap side of the rotor core 31, passes through the air gap, reaches the stator core tooth 11, then passes through the stator yoke 12, and reaches the south pole of the first permanent magnet 33. If the first permanent magnet 33 and the third permanent magnet 34 are magnetized along the circumferential tangential direction along the magnetic flux direction of the second permanent magnet 32, the motor is in a magnetization working condition at this time, such as Figure 2As shown, the magnetic flux density increases, and the maximum value of the radial magnetic flux density of the air gap is 0.901. Figure 6 As shown. After the two permanent magnetic fluxes are superimposed, they flow in the same direction, pass through the air gap, reach the stator core tooth 11, and then pass through the stator yoke 12, return to the south pole of the second permanent magnet 32 ​​along the same path and pass through the third permanent magnet 34; if the magnetization directions of the first permanent magnet 33 and the second permanent magnet 32 ​​are both clockwise or counterclockwise and the third permanent magnet 33 and the first permanent magnet 33 are tangentially magnetized in opposite directions, the motor is in the first level of weak magnetic speed regulation. Figure 3 As shown in the figure, the magnetic flux density does not decrease significantly, and the maximum radial magnetic flux density of the air gap is 0.849. Figure 7 As shown, most of the permanent magnetic flux is offset, the magnetic flux is reduced, a small part returns to the south pole of the second permanent magnet 32 ​​along the above path and passes through the third permanent magnet 34, and the rest passes through the first permanent magnet 33 and returns to the south pole of the first permanent magnet 33; if the magnetizing directions of the second permanent magnet 32 ​​and the third permanent magnet 34 are both clockwise or counterclockwise and the first permanent magnet 33 and the third permanent magnet 34 are tangentially magnetized in opposite directions, the motor is in the second level of weak magnetic speed regulation condition, such as Figure 4 As shown, the magnetic flux density is significantly reduced, and the maximum radial magnetic flux density of the air gap is 0.496. Figure 8 As shown, most of the permanent magnetic flux is offset, the magnetic flux is reduced, a small part returns to the south pole of the second permanent magnet 32 ​​along the above path and passes through the third permanent magnet 34, and the rest passes through the first permanent magnet 33 and returns to the south pole of the second permanent magnet 32; if the magnetization direction of the first permanent magnet 33 and the third permanent magnet 34 is the same as that of the second permanent magnet 32, and the magnetization direction is clockwise or counterclockwise, and the second permanent magnet 32 ​​is clockwise or counterclockwise in the opposite direction, the motor is in the third level of weak magnetic speed regulation. Figure 5 As shown, the magnetic flux density decreases most significantly, and the maximum radial magnetic flux density of the air gap is 0.409. Fig. 9 As shown in FIG. 1 , most of the permanent magnetic flux is offset, the magnetic flux is reduced, a small part returns to the south pole of the second permanent magnet 32 ​​along the above path and passes through the third permanent magnet 34, and the rest passes through the first permanent magnet 33 and returns to the south pole of the second permanent magnet 32. The distribution of magnetic lines of force of the first permanent magnet 33 and the third permanent magnet 34 in the two magnetization states is shown in FIG. Figure 2 , Figure 3 , Figure 4 and Figure 5 The first permanent magnet 33 and the third permanent magnet 34 are magnetized along the circumferential tangential direction along the magnetic flux direction of the second permanent magnet 32. The motor is in a magnetization state. The second permanent magnet 32 ​​and the third permanent magnet 34 are in a series relationship and are connected in parallel with the first permanent magnet 33. Figure 2As shown; when the magnetization directions of the first permanent magnet 33 and the second permanent magnet 32 ​​are both clockwise or counterclockwise and the third permanent magnet 33 and the first permanent magnet 33 are tangentially magnetized in opposite directions, the motor is in the first level of weak magnetic speed regulation, the second permanent magnet 32 ​​and the third permanent magnet 34 are in series and in parallel with the first permanent magnet 33, as shown Figure 3 As shown; when the magnetization directions of the second permanent magnet 32 ​​and the third permanent magnet 34 are both clockwise or counterclockwise and the first permanent magnet 33 and the third permanent magnet 34 are tangentially magnetized in opposite directions, the motor is in the second level of weak magnetic speed regulation, and the second permanent magnet 32, the third permanent magnet 34 and the first permanent magnet 33 are in a series relationship, as shown Figure 4 As shown; when the magnetizing directions of the first permanent magnet 33 and the third permanent magnet 34 are both clockwise or counterclockwise and are clockwise or counterclockwise in the opposite direction to the second permanent magnet, the motor is in the third level of weak magnetic speed regulation, and the first permanent magnet 33, the second permanent magnet 32 ​​and the third permanent magnet 34 are in a series relationship, such as Figure 5 At the same time, the motor armature winding 2 is fed with a three-phase alternating current having the same rotation speed as the hybrid permanent magnet rotor 3, and the rotating magnetic fields formed by the stator and rotor interact with each other, thereby realizing electromechanical energy conversion, and the double-layer permanent magnet structure can broaden the magnetic field adjustment range of the motor.

Claims

1. A series-parallel variable flux permanent magnet memory motor, characterized in that: The invention comprises a stator (1), an armature winding (2), a hybrid permanent magnet rotor (3) and a non-magnetic rotating shaft (4); the stator (1) comprises a plurality of stator yokes (12) and iron core teeth (11) arranged at the ends of the stator yokes (12); the armature windings (2) are wound around the iron core teeth (11); the plurality of iron core teeth (11) surround a circular hollow area; a hybrid permanent magnet rotor (3) is arranged in the hollow area; the center of the hollow area is the non-magnetic rotating shaft (4); the hybrid permanent magnet rotor (3) rotates around the non-magnetic rotating shaft (4); the hybrid permanent magnet rotor (3) comprises a rotor core (31), a second permanent magnet (32), a first permanent magnet (33), a third permanent magnet (3 ... The magnetic rotor (3) is provided with first permanent magnets (33) on the top, bottom, left and right respectively. Each first permanent magnet (33) is provided with two second permanent magnets (32) and a third permanent magnet (34). The second permanent magnets (32) on two adjacent first permanent magnets (33) are connected. The third permanent magnet (34) on the first permanent magnet (33) is connected to the non-magnetic shaft (4) to form an "octagonal" structure. The magnets are connected by magnetic barriers. The entire "octagonal" structure is embedded in the rotor core (31). The first permanent magnet (33) is one or more aluminum nickel cobalt permanent magnets, the second permanent magnet (32) is a neodymium iron boron permanent magnet, and the third permanent magnet (34) is an aluminum nickel cobalt permanent magnet.

2. The series-parallel variable flux permanent magnet memory motor according to claim 1, characterized in that: The magnetic barriers include a trapezoidal magnetic barrier (35), an arc-shaped magnetic barrier (36) and a triangular magnetic barrier (37); the trapezoidal magnetic barrier (35) is used to connect the first permanent magnet (33) and the second permanent magnet (32); the arc-shaped magnetic barrier (36) is used to connect the two second permanent magnets (32); and the triangular magnetic barrier (37) is used to connect the third permanent magnet (34) and the non-magnetic rotating shaft (4).

3. The series-parallel variable flux permanent magnet memory motor according to claim 1, characterized in that: The ends of the second permanent magnet (32) away from the non-magnetic rotating shaft (4) are respectively arranged in an eight-shaped pattern close to the bottom of the first permanent magnet (33), with the opening facing the rotating shaft direction.

4. The series-parallel variable flux permanent magnet memory motor according to claim 1, characterized in that: The third permanent magnet (34) is perpendicular to the first permanent magnet (33) and is arranged in a T-shape with the first permanent magnet (33).

5. The series-parallel variable flux permanent magnet memory motor according to claim 1, characterized in that: The first permanent magnet (33), the second permanent magnet (32) and the third permanent magnet (34) form a double-layer permanent magnet structure, which are in a series-parallel relationship under the magnetic circuit magnetization working condition, and in a series or series-parallel relationship under the magnetic weakening working condition.

6. The series-parallel variable flux permanent magnet memory motor according to claim 5, characterized in that: Under the magnetization working condition, each third permanent magnet (34) and the second permanent magnet (32) are magnetized in the same clockwise or counterclockwise direction along the width direction of the permanent magnet block, and the magnetization directions of two adjacent second permanent magnets (32) are alternately clockwise and counterclockwise, and the magnetization direction of the first permanent magnet (33) is tangential magnetization, which is the same as the magnetization direction of the third permanent magnet (34) and the second permanent magnet (32), which is clockwise or counterclockwise.

7. The series-parallel variable flux permanent magnet memory motor according to claim 5, characterized in that: The speed regulation under the weak magnetic condition is divided into three levels, namely the first level magnetic regulation condition, the second level magnetic regulation condition and the third level magnetic regulation condition.

8. The series-parallel variable flux permanent magnet memory motor according to claim 7, characterized in that: Under the first-stage magnetic adjustment working condition, the magnetization directions of the first permanent magnet (33) and the second permanent magnet (32) are both clockwise or counterclockwise, and the third permanent magnet (34) and the first permanent magnet (33) are tangentially magnetized in opposite directions. At this time, the first permanent magnet (33) and the third permanent magnet (34) respectively work in positive magnetization and reverse weak magnetic working conditions.

9. The series-parallel variable flux permanent magnet memory motor according to claim 7, characterized in that: Under the second-stage magnetic adjustment working condition, the magnetization directions of the second permanent magnet (32) and the third permanent magnet (34) are both clockwise or counterclockwise, and the first permanent magnet (33) and the third permanent magnet (34) are tangentially magnetized in opposite directions. At this time, the first permanent magnet (33) and the third permanent magnet (34) respectively work in reverse weak magnetic field and positive magnetization working conditions.

10. The series-parallel variable flux permanent magnet memory motor according to claim 7, characterized in that: Under the third-stage magnetic adjustment working condition, the magnetization directions of the first permanent magnet (33) and the third permanent magnet (34) are both clockwise or counterclockwise, and are clockwise or counterclockwise in the opposite direction to the second permanent magnet (32), and the first permanent magnet (33) and the third permanent magnet (34) work in a reverse weak magnetic working condition.

Images