An asymmetric dual-stator axial magnetic field V-type permanent magnet flux switching motor

Abstract

The present invention discloses an asymmetric dual-stator axial magnetic field V-shaped embedded permanent magnet flux switching motor in the field of magnetic field flux switching motor technology. The motor includes a coaxially mounted excitation stator, an armature stator, and a rotor located between the excitation stator and the armature stator with an air gap. The excitation stator, armature stator, and rotor all have a salient pole topology. The present invention arranges permanent magnets and armature windings on the excitation stator and armature stator, respectively, which alleviates the saturation state of the motor stator magnetic circuit, enhances the torque capacity of the motor under overload conditions, and improves the torque density and power density of the motor. The invention adopts a combination of special magnetization methods and an embedded permanent magnet structure to enhance the magnetization capacity of the motor, improve the sinusoidality of the air gap magnetic flux density and the reluctance torque component of the motor. The armature stator and the excitation stator adopt an asymmetric tooth structure, which reduces the harmonic content of the air gap magnetic flux density and weakens the torque pulsation of the motor.

Description

Technical Field

[0001] The present invention belongs to the technical field of magnetic field flux switching motors, and in particular relates to an asymmetric double-stator axial magnetic field V-shaped permanent magnet flux switching motor. Background Art

[0002] Stator permanent magnet type permanent magnet flux switching motor usually adopts a double salient pole structure. The armature winding and permanent magnets are both located on the stator, and there are neither windings nor permanent magnets on the rotor. The simple structure makes the motor have the advantages of high power density, high torque density, and high efficiency.

[0003] However, in the stator permanent magnet axial magnetic field flux switching motor, the permanent magnet is located in the stator, which severely squeezes the armature winding slot area and seriously saturates the stator tooth magnetic circuit, increases the harmonic content of the motor air gap magnetic density, and makes the air gap magnetic density sine worse; and causes the motor winding copper loss and stator loss to increase sharply, weakening the torque capacity of the motor under overload conditions, causing serious overall heating of the motor, which has an adverse effect on the motor's service life and reliability. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an asymmetric dual-stator axial magnetic field V-type permanent magnet flux switching motor to solve the problems existing in the above-mentioned background technology, such as poor sinusoidality of the air gap magnetic field of the stator permanent magnet type permanent magnet flux switching motor, severe saturation of the core magnetic circuit resulting in high core loss, poor overload capacity, and low heat dissipation efficiency.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An asymmetric dual-stator axial magnetic field V-shaped embedded permanent magnet flux switching motor, the motor comprising a coaxially mounted excitation stator, an armature stator, and a rotor located between the excitation stator and the armature stator with an air gap;

[0007] The excitation stator, armature stator and rotor are all salient pole topology structures;

[0008] The excitation stator and the armature stator are respectively located on both sides of the rotor, and the excitation stator and the armature stator are symmetrically arranged relative to the rotor;

[0009] The excitation stator includes an excitation stator core unit and a permanent magnet;

[0010] The rotor includes a fixing ring and rotor teeth;

[0011] The armature stator includes an armature stator core unit and an armature winding.

[0012] Preferably, the excitation stator core unit includes excitation stator teeth and an excitation stator yoke, the excitation stator teeth include first excitation stator tooth poles, second excitation stator tooth poles and a magnetic bridge, and trapezoidal excitation stator slots are respectively provided inside the first excitation stator tooth poles and the second excitation stator tooth poles.

[0013] Preferably, the permanent magnet includes a first permanent magnet pole and a second permanent magnet pole, and the first permanent magnet pole and the second permanent magnet pole are respectively arranged in the excitation stator slots in the first excitation stator tooth pole and the second excitation stator tooth pole, and the first permanent magnet pole and the second permanent magnet pole are magnetized along the short side, and the magnetization direction points to the magnetic bridge.

[0014] Preferably, the excitation stator core unit and the permanent magnet are closely arranged along the circumference to form a ring shape.

[0015] Preferably, the rotor teeth are evenly distributed in a circular ring shape outside the fixing ring.

[0016] Preferably, the armature stator core unit includes an armature stator tooth and an armature stator yoke, the armature stator tooth includes a first armature stator tooth pole, a second armature stator tooth pole and an armature stator tooth root, the armature stator tooth root of the armature stator tooth is fixed to the armature stator yoke, the first armature stator tooth pole and the second armature stator tooth pole are parallel tooth structures, and an armature stator slot is provided between the first armature stator tooth pole and the second armature stator tooth pole, and the armature stator slot is a parallel slot structure.

[0017] Preferably, the armature winding is wound around the root of the armature stator teeth;

[0018] The armature stator core units are closely arranged along the circumference to form a circular ring.

[0019] Preferably, the excitation stator core unit, the armature stator core unit and the rotor teeth are made of silicon steel material laminated in the radial direction, the permanent magnets are neodymium iron boron permanent magnets, and the fixing ring is cast by epoxy resin.

[0020] Preferably, the number of the excitation stator core units, permanent magnets, armature stator core units, and armature windings is 12n, and the number of rotor teeth is 12n±k, where n and k are positive integers.

[0021] Beneficial effects of the present invention:

[0022] 1. The present invention arranges the permanent magnet and the armature winding on the excitation stator and the armature stator respectively, which alleviates the saturation state of the motor stator magnetic circuit, enhances the torque capacity of the motor under overload state, and improves the torque density and power density of the motor;

[0023] 2. The present invention adopts a special combination of magnetization methods and an embedded permanent magnet structure, which enhances the magnetization ability of the motor and improves the sinusoidality of the air gap magnetic flux density and the reluctance torque component of the motor;

[0024] 3. The armature stator and the excitation stator in the present invention adopt an asymmetric tooth structure, which reduces the harmonic content of the air gap magnetic density and weakens the torque pulsation of the motor;

[0025] 4. The double-air-gap symmetrical structure of the present invention, consisting of a double stator and a single rotor, can balance the axial magnetic pull on both sides and increase the mechanical strength of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 It is a schematic diagram of the explosion structure of the present invention;

[0028] Figure 2 This is a schematic structural diagram of the excitation stator core unit in the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the armature stator core unit in the present invention;

[0030] Figure 4 The rotor angle in the present invention is Permanent magnet flux path diagram;

[0031] Figure 5 The rotor angle in the present invention is Permanent magnet flux path diagram.

[0032] In the figure: 1. Excitation stator; 2. Rotor; 3. Armature stator; 4. Excitation stator core unit; 4-1. Excitation stator teeth; 4-2. Excitation stator yoke; 4-1-1. First excitation stator tooth pole; 4-1-2. Second excitation stator tooth pole; 4-1-3. Conductive bridge; 4-1-4. Excitation stator slot; 5. Permanent magnet; 5-1. First permanent magnet pole; 5-2. Second permanent magnet pole; 6. Rotor teeth; 7. Retaining ring; 8. Armature stator core unit; 8-1. Armature stator teeth; 8-2. Armature stator yoke; 8-1-1. First armature stator tooth pole; 8-1-2. Second armature stator tooth pole; 8-1-3. Armature stator tooth root; 8-1-4. Armature stator slot; 9. Armature winding; 10. Rotor angle is The permanent magnet flux path when ; 11. The rotor angle is The permanent magnet flux path. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] See also Figure 1 As shown, the present invention proposes an asymmetric dual-stator axial magnetic field V-shaped embedded permanent magnet flux switching motor, the motor includes a coaxially mounted excitation stator 1, an armature stator 3, and a rotor 2 located between the excitation stator 1 and the armature stator 3 with an air gap. The excitation stator 1, the armature stator 3 and the rotor 2 all have a salient pole topology structure. The excitation stator 1 and the armature stator 3 are respectively located on both sides of the rotor 2 and are symmetrically arranged relative to the rotor 2.

[0035] The excitation stator 1 includes a plurality of excitation stator core units 4 and permanent magnets 5. The excitation stator core units 4 are made of silicon steel material and laminated radially. The permanent magnets 5 are made of neodymium iron boron permanent magnets. The number of the excitation stator core units 4 and the permanent magnets 5 is 12n, where n is a positive integer.

[0036] The rotor 2 includes a fixed ring 7 and a plurality of rotor teeth 6. The rotor teeth 6 are evenly distributed in a circular ring shape outside the fixed ring 7. The rotor teeth 6 are made of radially laminated silicon steel. The fixed ring 7 is cast with epoxy resin. The number of rotor teeth 6 is 12n±k, where k and n are positive integers.

[0037] The armature stator 3 includes a plurality of armature stator core units 8 and armature windings 9. The armature stator core units 8 are made of silicon steel material and laminated radially. The number of the armature stator core units 8 and armature windings 9 is 12n, where n is a positive integer.

[0038] See also Figure 2 As shown, the excitation stator core unit 4 includes an excitation stator tooth 4-1 and an excitation stator yoke 4-2. The excitation stator tooth 4-1 includes a first excitation stator tooth pole 4-1-1, a second excitation stator tooth pole 4-1-2 and a magnetic bridge 4-1-3. Trapezoidal excitation stator slots 4-1-4 are respectively provided inside the first excitation stator tooth pole 4-1-1 and the second excitation stator tooth pole 4-1-2.

[0039] The permanent magnet 5 includes a first permanent magnet pole 5-1 and a second permanent magnet pole 5-2. The first permanent magnet pole 5-1 and the second permanent magnet pole 5-2 are respectively arranged in the excitation stator slot 4-1-4 in the first excitation stator tooth pole 4-1-1 and the second excitation stator tooth pole 4-1-2. The first permanent magnet pole 5-1 and the second permanent magnet pole 5-2 are magnetized along the short side, and the magnetization direction points to the magnetic bridge 4-1-3; the excitation stator core unit 4 and the permanent magnet 5 are closely arranged along the circumference to form a circular ring.

[0040] See also Figure 3 As shown, the armature stator core unit 8 includes an armature stator tooth 8-1 and an armature stator yoke 8-2. The armature stator tooth 8-1 includes a first armature stator tooth pole 8-1-1, a second armature stator tooth pole 8-1-2 and an armature stator tooth root 8-1-3. The armature stator tooth root 8-1-3 of the armature stator tooth 8-1 is fixed to the armature stator yoke 8-2. The first armature stator tooth pole 8-1-1 and the second armature stator tooth pole 8-1-2 are parallel tooth structures, and an armature stator slot 8-1-4 is provided between the first armature stator tooth pole 8-1-1 and the second armature stator tooth pole 8-1-2. The armature stator slot 8-1-4 is a parallel slot structure. The armature winding 9 is wound around the armature stator tooth root 8-1-3. The armature stator core unit 8 is closely arranged along the circumference to form a circular ring.

[0041] Working principle:

[0042] When rotor 2 runs to When the rotor angle is When the permanent magnet flux path 10 is Figure 4 In the figure, taking phase A as an example, according to the “minimum magnetic resistance principle”, the permanent magnetic flux penetrates the A1 winding along the direction of the arrow; when the rotor 2 runs to When the rotor angle is When the permanent magnet flux path 11 is Figure 5 In the figure, the magnetic flux exits the A1 winding in the direction of the arrow. In the two positions described above, the permanent magnetic flux of the A1 winding turns has the same value but opposite polarity. As rotor 2 rotates continuously, the permanent magnetic flux of the A1 winding turns periodically varies between positive and negative amplitudes, corresponding to the generation of an induced electromotive force with alternating amplitude and phase.

[0043] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0046] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0047] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. An asymmetric dual-stator axial magnetic field V-shaped embedded permanent magnet flux switching motor, characterized in that: The motor comprises a coaxially mounted excitation stator (1), an armature stator (3), and a rotor (2) located between the excitation stator (1) and the armature stator (3) with an air gap. The excitation stator (1), the armature stator (3) and the rotor (2) are all salient pole topology structures; The excitation stator (1) and the armature stator (3) are respectively located on both sides of the rotor (2), and the excitation stator (1) and the armature stator (3) are symmetrically arranged relative to the rotor (2); The excitation stator (1) comprises an excitation stator core unit (4) and a permanent magnet (5); The rotor (2) comprises a fixing ring (7) and rotor teeth (6); The armature stator (3) comprises an armature stator core unit (8) and an armature winding (9); The excitation stator core unit (4) comprises an excitation stator tooth (4-1) and an excitation stator yoke (4-2); the excitation stator tooth (4-1) comprises a first excitation stator tooth pole (4-1-1), a second excitation stator tooth pole (4-1-2) and a magnetic bridge (4-1-3); and trapezoidal excitation stator slots (4-1-4) are respectively provided inside the first excitation stator tooth pole (4-1-1) and the second excitation stator tooth pole (4-1-2); The permanent magnet (5) comprises a first permanent magnet pole (5-1) and a second permanent magnet pole (5-2), the first permanent magnet pole (5-1) and the second permanent magnet pole (5-2) being respectively arranged in the excitation stator slot (4-1-4) in the first excitation stator tooth pole (4-1-1) and the second excitation stator tooth pole (4-1-2), the first permanent magnet pole (5-1) and the second permanent magnet pole (5-2) being magnetized along the short side, and the magnetization direction is directed toward the magnetic bridge (4-1-3); The excitation stator core unit (4) and the permanent magnet (5) are closely arranged along the circumference to form a circular ring; The number of the excitation stator core units (4), permanent magnets (5), armature stator core units (8), and armature windings (9) is 12n, and the number of the rotor teeth (6) is 12n±k, where n and k are positive integers.

2. The asymmetric dual-stator axial magnetic field V-shaped embedded permanent magnet flux switching motor according to claim 1, characterized in that: The rotor teeth (6) are evenly distributed in a circular ring shape outside the fixing ring (7).

3. The asymmetric dual-stator axial magnetic field V-shaped embedded permanent magnet flux switching motor according to claim 1, characterized in that: The armature stator core unit (8) comprises an armature stator tooth (8-1) and an armature stator yoke (8-2); the armature stator tooth (8-1) comprises a first armature stator tooth pole (8-1-1), a second armature stator tooth pole (8-1-2) and an armature stator tooth root (8-1-3); the armature stator tooth root (8-1-3) of the armature stator tooth (8-1) is fixed to the armature stator yoke (8-2); the first armature stator tooth pole (8-1-1) and the second armature stator tooth pole (8-1-2) are parallel tooth structures; an armature stator slot (8-1-4) is provided between the first armature stator tooth pole (8-1-1) and the second armature stator tooth pole (8-1-2); the armature stator slot (8-1-4) is a parallel slot structure.

4. The asymmetric dual-stator axial magnetic field V-shaped embedded permanent magnet flux switching motor according to claim 3, characterized in that: The armature winding (9) is wound around the armature stator tooth root (8-1-3); The armature stator core units (8) are closely arranged along the circumference to form a circular ring shape.

5. The asymmetric dual-stator axial magnetic field V-shaped embedded permanent magnet flux switching motor according to claim 4, characterized in that: The excitation stator core unit (4), the armature stator core unit (8) and the rotor teeth (6) are made of silicon steel material and laminated in the radial direction. The permanent magnet (5) is made of neodymium iron boron permanent magnet, and the fixing ring (7) is cast by epoxy resin.

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