A stator permanent magnet assisted double-armature winding multiple electromagnetic torque reluctance motor structure

Abstract

The present invention discloses a structure of a stator permanent magnet-assisted dual-armature winding multi-electromagnetic torque reluctance motor, which includes a stator and a rotor both of which are salient pole structures. The rotor and the stator rotate relative to each other, and an annular air gap is formed between the stator and the rotor. The stator includes a stator core, a stator armature winding and a stator permanent magnet. The stator core includes stator teeth and a stator yoke. The stator armature winding is wound on the stator teeth in the structure of a two-phase fractional-slot concentrated winding, and a stator permanent magnet is arranged on each stator tooth. The rotor includes a rotor core and a rotor armature winding. The rotor core includes rotor teeth and a rotor yoke. The rotor armature winding is wound on the rotor teeth in the structure of a three-phase fractional-slot concentrated winding. The present invention has the characteristics of high torque density and strong fault tolerance performance, and while ensuring strong fault tolerance, further improves the torque density.

Description

Technical Field

[0001] The present invention belongs to the field of motors, and particularly relates to a stator permanent magnet assisted double-armature winding multiple electromagnetic torque reluctance motor structure. Background Art

[0002] In recent years, with the development of new energy vehicles and space shuttles, the motors used are required to have high torque density (power density), high efficiency, and high fault tolerance. Permanent magnet motors have large torque density and high power factor, but the price of permanent magnet materials is relatively high, and there is a risk of demagnetization at high temperatures. Traditional switched reluctance motors have simple structures and low prices, but have defects such as high noise, vibration, and torque ripple. Traditional magnetic field modulation motors have the characteristic of high torque density, but usually only contain a set of armature windings. Once the winding fails, torque cannot be generated, and the fault tolerance performance is poor. Summary of the Invention

[0003] To solve the problems existing in the prior art, a stator permanent magnet assisted double-armature winding multiple electromagnetic torque reluctance motor structure is provided. The present invention has the characteristics of high torque density and strong fault tolerance, and while ensuring strong fault tolerance, the torque density is further improved.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A stator permanent magnet assisted double-armature winding multiple electromagnetic torque reluctance motor structure includes a stator and a rotor both having salient pole structures. The rotor and the stator rotate relative to each other, and an annular air gap is formed between the stator and the rotor;

[0006] The stator includes a stator core, a stator armature winding, and a stator permanent magnet. The stator core includes stator teeth and a stator yoke. The stator armature winding is wound around the stator teeth in the structure of a two-phase fractional-slot concentrated winding. One stator permanent magnet is provided on each stator tooth, or one stator permanent magnet is provided on every other stator tooth among all the stator teeth; the magnetic fields of all the stator permanent magnets are radial magnetic fields;

[0007] The rotor includes a rotor core and a rotor armature winding. The rotor core includes rotor teeth and a rotor yoke. The rotor armature winding is wound around the rotor teeth in the structure of a three-phase fractional-slot concentrated winding.

[0008] As a further improvement of the present invention, the stator armature winding is a two-phase winding, and a composite current of an alternating current superposed with a direct current component is passed through. The composite current is passed through the stator armature winding in the order of i A+ 、i B+ 、i A- 、i B- ; the rotor armature winding is a three-phase winding, and a three-phase symmetrical current is passed through the rotor armature winding, and in the order of i D 、i E, i F are sequentially fed into the rotor armature winding in this order.

[0009] As a further improvement of the present invention, the expressions of the phase currents are:

[0010]

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[0017] ω es = N r ω r

[0018] ω er = P ar ω r

[0019] wherein, I ac is the effective value of the stator AC component, I dc is the average value of the stator DC component, ω es is the electrical angular velocity of the stator armature winding, а s is the stator initial phase angle, I acr is the effective value of the rotor current, ω er is the electrical angular velocity of the rotor armature winding, а r is the rotor initial phase angle, N r is the number of rotor slots, P ar is the number of pole pairs of the rotor armature winding, ω r is the mechanical angular velocity.

[0020] As a further improvement of the present invention, when the stationary magnetomotive force generated by the DC component of the stator armature winding with P dc pole pairs is modulated by the magnetic conductance wave formed by the rotor teeth with N r teeth, and the generated rotating magnetic field and the fundamental wave magnetomotive force with P аs pole pairs generated by the AC component of the stator armature winding satisfy the following relationship, torque will be generated;

[0021] P as = |N r ± P dc |

[0022] After the rotor armature winding is energized with alternating current, P ar opposite-pole rotating magnetic potential of the rotor is formed. When the number of pole pairs of the rotating magnetic potential of the rotor is the same as that of the unmodulated direct current magnetic potential generated by the direct current component of the stator, that is, when the following formula is satisfied, electromagnetic torque will be generated;

[0023] P dc = P ar

[0024] When the number of stator slots N s and the number of pole pairs of the rotor armature winding is P ar satisfy the following formula, a reluctance torque component similar to that of a synchronous reluctance motor will be generated;

[0025] N s = 2P ar

[0026] After the rotor armature winding is energized with alternating current, the P ar opposite-pole rotating magnetic potential of the rotor is formed. After being modulated by the magnetic conductance wave formed by the rotor teeth with the number of teeth N r , when the number of pole pairs of the rotating magnetic field generated is the same as that of the rotating magnetic potential generated by the alternating current component of the stator, that is, when the following formula is satisfied, electromagnetic torque will be generated;

[0027] P as = |N r ± P ar |

[0028] When the number of pole pairs of the stationary magnetomotive force generated by the stator permanent magnet is P pm and the number of pole pairs P dc of the stationary magnetomotive force generated by the direct current component of the stator armature winding are the same, two additional electromagnetic torques will be generated, and the expressions are as follows:

[0029] P as = |N r ± P pm |

[0030] P pm = P ar .

[0031] As a further improvement of the present invention, the cooperation of the number of stator and rotor slots and the number of pole pairs is:

[0032]

[0033] As a further improvement of the present invention, the number of stator and rotor slots satisfies the formula:

[0034] N s = k1m s

[0035] N r = k2m r

[0036] where k1 and k2 are integers, and m s is the number of AC phases of the stator armature winding, and m r is the number of AC phases of the rotor armature winding.

[0037] As a further improvement of the present invention,

[0038] the outer contours of the rotor teeth and the rotor yoke are both concentric arc structures;

[0039] the outer contours of the stator teeth and the stator yoke are both concentric arc structures;

[0040] the air gap is provided between the rotor teeth and the stator teeth.

[0041] Compared with the prior art, it has the following advantages:

[0042] The present invention has a doubly salient pole structure and adopts the magnetic field modulation principle. Windings are provided in the grooves of the stator and rotor iron cores. Auxiliary permanent magnets are contained in the stator teeth. The current supplied to the stator winding includes a DC part and a two-phase AC part, and the rotor winding is supplied with three-phase alternating current. During normal operation, the two sets of windings and the stator auxiliary permanent magnets are superimposed to output mechanical torque, having a high torque density, and can also generate torque when any one set of windings fails, improving the fault tolerance of the motor. The structure is simple, with strong robustness, high torque density, and strong fault tolerance, thereby improving the motor torque density.

[0043] During normal operation, the stator and rotor armature windings are powered simultaneously to achieve high torque density and high efficiency output. When a fault occurs in the stator or rotor armature winding of the motor, the power supply of the faulty winding is cut off, and torque can still be generated. When a fault occurs in the rotor armature winding, the power supply of the rotor armature winding is cut off, and the stator phase winding current is reconstructed. At this time, the motor contains the first and fifth part torques, and the motor operates as a stator permanent magnet assisted DC-biased vernier reluctance motor to achieve short-time full-load operation; when a fault occurs in the stator armature winding, the power supply of the stator armature winding is cut off, and the rotor phase winding current is reconstructed. At this time, the motor contains the third and sixth part torques, and the motor operates as a permanent magnet assisted reluctance synchronous motor to achieve short-time full-load operation. This invention patent will have a wide range of application prospects in application scenarios that require motors to have high torque density and high fault tolerance, including but not limited to vehicle hub motor drive systems, aerospace, deep sea exploration, etc. Description of the Drawings

[0044] Figure 1 is a schematic structural diagram of the present invention;

[0045] Among them: 1. Stator; 1-1. Stator armature winding; 1-2. Stator teeth; 1-3. Stator permanent magnet; 2. Air gap; 3. Rotor; 3-1. Rotor armature winding; 3-2. Rotor teeth.

[0046] Figure 2 This is the connection diagram of the stator armature winding of the present invention;

[0047] Figure 3 This is the connection diagram of the rotor armature winding of the present invention;

[0048] Figure 4 This is the improved diagram of the stator auxiliary permanent magnet of the present invention;

[0049] Figure 5 This is the improved connection diagram of the stator winding. Detailed implementation manners

[0050] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0051] The present invention includes a stator 1 and a rotor 3, and the iron cores of both the stator 1 and the rotor 3 are salient pole structures. There is an air gap between the stator 1 and the rotor 3. The stator 1 includes a stator iron core, a stator armature winding 1-1 and a stator permanent magnet 1-3, and the rotor 3 includes a rotor iron core and a rotor armature winding 3-1.

[0052] As a preferred embodiment, the stator includes a stator iron core, a stator armature winding and a stator permanent magnet. The stator iron core includes stator teeth and a stator yoke. The stator armature winding is wound around the stator teeth in the structure of a two-phase fractional-slot concentrated winding, and a stator permanent magnet is arranged on each stator tooth. The rotor includes a rotor iron core and a rotor armature winding. The rotor iron core includes rotor teeth and a rotor yoke. The rotor armature winding is wound around the rotor teeth in the structure of a three-phase fractional-slot concentrated winding.

[0053] A lower-cost implementation scheme is as follows: The composite current is sequentially fed into the stator armature winding in the order of i A+ 、i B+ 、i A- 、i B- ; A three-phase symmetrical current is fed into the rotor armature winding, and in the order of i D 、i E 、i FThey are sequentially fed into the rotor armature winding in the order of... The rotor armature winding is a three-phase winding, and three-phase symmetrical currents are fed into it through feasible devices such as brush slip rings and resolvers. The expressions of each phase current are:

[0054]

[0055]

[0056]

[0057]

[0058]

[0059]

[0060]

[0061] ω es = N r ω r

[0062] ω er = P ar ω r

[0063] Among them, I ac is the effective value of the stator AC component, I dc is the average value of the stator DC component, ω es is the electrical angular velocity of the stator armature winding, а s is the stator initial phase angle, I acr is the effective value of the rotor current, ω er is the electrical angular velocity of the rotor armature winding, а r is the rotor initial phase angle, N r is the number of rotor slots, P ar is the number of pole pairs of the rotor armature winding, ω r is the mechanical angular velocity.

[0064] The number of pole pairs generated by the DC component of the stator armature winding is P dc The stationary magnetomotive force passes through the magnetic conductance wave formed by the rotor teeth with the number of teeth N r After magnetic field modulation, when the generated rotating magnetic field and the fundamental wave magnetomotive force with the number of pole pairs P аs of the stator armature winding AC component satisfy the following relationship, torque will be generated.

[0065] P as = |N r ± P dc |

[0066] After alternating current is applied to the rotor armature winding, a rotating magnetic potential of the rotor with P ar opposite poles is formed. When the number of pole pairs of the rotating magnetic potential of the rotor is the same as that of the unmodulated direct current magnetic potential generated by the direct current component of the stator, that is, when the following formula is satisfied, an electromagnetic torque will be generated.

[0067] P dc = P ar

[0068] When the number of stator slots N s and the number of pole pairs of the rotor armature winding is P ar satisfy the following formula, a reluctance torque component similar to that of a synchronous reluctance motor will be generated.

[0069] N s = 2P ar

[0070] After alternating current is applied to the rotor armature winding, a rotating magnetic potential of the rotor with P ar opposite poles is formed. After being modulated by the magnetic conductance wave formed by the rotor teeth with the number of teeth N r , when the number of pole pairs of the rotating magnetic field generated is the same as that of the rotating magnetic potential generated by the alternating current component of the stator, that is, when the following formula is satisfied, an electromagnetic torque will be generated.

[0071] P as = |N r ± P ar |

[0072] When the number of pole pairs of the stationary magnetomotive force generated by the stator permanent magnet is P pm and the number of pole pairs P dc of the stationary magnetomotive force generated by the direct current component of the stator armature winding are the same, two additional electromagnetic torques will be generated, and the expressions are as follows:

[0073] P as = |N r ± P pm |

[0074] P pm = P ar

[0075] The above analysis shows that if the motor parameters are properly selected, six parts of torque will be generated:

[0076] One is the torque generated by the interaction between the rotating magnetic field modulated by the direct current component of the stator armature winding through the rotor teeth and the rotating magnetic potential generated by the alternating current component of the stator armature winding;

[0077] Two is the torque generated by the interaction between the direct current magnetic potential generated without modulation by the direct current component of the stator armature winding and the magnetic potential generated by the rotor armature winding;

[0078] Thirdly, it is the reluctance torque component formed by the rotor armature winding and the stator salient poles;

[0079] Fourthly, it is the torque generated by the interaction between the magnetomotive force generated by the rotor armature winding after being modulated by the rotor teeth and the magnetomotive force of the alternating current component of the stator armature winding;

[0080] Fifthly, it is the torque generated by the interaction between the rotating magnetic field modulated by the stator permanent magnet through the rotor teeth and the rotating magnetomotive force of the alternating current component of the stator armature winding;

[0081] Sixthly, it is the torque generated by the interaction between the magnetomotive force generated by the stator permanent magnet and the magnetomotive force generated by the rotor armature winding. When the directions of the torques of the six parts acting on the rotor are the same, the synthesized electromagnetic torque is the largest.

[0082] The stator and rotor slot numbers and pole-pair combinations that satisfy the above three relationships are as follows:

[0083]

[0084] Among them, the stator and rotor slot numbers satisfy the formula:

[0085] N s = k1m s

[0086] N r = k2m r

[0087] In the formula, k1 and k2 are integers, and m s is the number of alternating current phases of the stator armature winding, and m r is the number of alternating current phases of the rotor armature winding.

[0088] All other slot-pole combinations that satisfy the above eight formulas and conform to the principle described in this patent are within the protection scope of this patent, and will not be listed here. In addition, taking the inner-rotor motor model as an example in this patent, those that conform to the principle described in this patent include, but are not limited to, outer-rotor motors and axial-field motors, and are all within the protection scope of this patent.

[0089] The following further describes the present invention with reference to the accompanying drawings.

[0090] Embodiment

[0091] See Figure 1, the present invention includes a stator 1, a rotor 3, with an air gap 2 between the stator 1 and the rotor 3. The stator 1 includes a stator armature winding 1-1, stator teeth 1-2, and a stator permanent magnet 1-3. The rotor 3 includes a rotor armature winding 3-1 and rotor teeth 3-2. The stator armature winding 1-1 is wound around the stator teeth 1-2 in the structure of a two-phase fractional-slot concentrated winding, and the stator permanent magnet 1-3 is contained on the stator teeth 1-2. The rotor armature winding 3-1 is wound around the rotor teeth 3-2 in the structure of a three-phase fractional-slot concentrated winding.

[0092] See Figure 2 , Figure 2 is the connection diagram of the stator winding of the present invention. The stator 1 of the present invention has a total of 8 slots and adopts a single-layer winding. The stator winding 1-1 is a two-phase concentrated winding structure, and a DC bias current is applied. The DC component generates a magnetic potential with 4 pairs of poles, and the AC component generates a magnetic potential with 5 pairs of poles. Moreover, a permanent magnet is contained on each stator tooth, and the magnetization directions of the permanent magnets are marked in Figure 2 . The magnetic fields of all the permanent magnets are radial magnetic fields, and the magnetic field directions of adjacent permanent magnets are opposite.

[0093] See Figure 3 , Figure 3 is the connection diagram of the rotor winding of the present invention. The rotor 3 of the present invention has a total of 9 slots and adopts a double-layer winding. The rotor winding 3-1 is a three-phase concentrated winding structure and generates a magnetic potential with 4 pairs of poles.

[0094] See Figure 4 , when the stator winding connection remains unchanged, the permanent magnets on the stator teeth are improved to be arranged at intervals, that is, permanent magnets are arranged on the stator teeth around which the stator winding is wound, and the magnetization directions of the permanent magnets are marked in Figure 5 . The magnetic fields of all the permanent magnets are radial magnetic fields and all point to the center of the circle.

[0095] The composite current is fed into the stator armature winding in the order of i A+ , i B+ , i A- , i B- . A three-phase symmetrical current is fed into the rotor armature winding and is fed into the rotor armature winding in the order of i D , i E , i F . The rotor armature winding is a three-phase winding, and a three-phase symmetrical current is fed through feasible devices such as brush slip rings and rotary transformers. The expressions of the currents of each phase are:

[0096]

[0097]

[0098]

[0099]

[0100]

[0101]

[0102]

[0103] ω es = N r ω r

[0104] ω er = P ar ω r

[0105] Among them, I ac is the effective value of the stator AC component, I dc is the average value of the stator DC component, ω es is the electrical angular velocity of the stator armature winding, а s is the stator initial phase angle, I acr is the effective value of the rotor current, ω er is the electrical angular velocity of the rotor armature winding, а r is the rotor initial phase angle, N r is the number of rotor slots, P ar is the number of pole pairs of the rotor armature winding, ω r is the mechanical angular velocity.

[0106] For a better explanation of the working principle of this motor, the following combines the attached Figure 1 to describe the present invention.

[0107] The pole and slot combination of the stator and rotor of the present invention is 8 / 9. The DC component in the stator armature winding generates a 4-pole stationary magnetomotive force, the AC component generates a 5-pole rotating magnetomotive force, the stator permanent magnet generates a 4-pole stationary magnetomotive force, and the rotor armature winding generates a 4-pole rotating magnetomotive force. After the 4-pole stationary magnetomotive force generated by the DC component of the stator armature winding is modulated by the rotor tooth magnetic field, the generated 5-pole rotating magnetic field is coupled with the stator AC component magnetomotive force to generate the first part of the torque component; the 4-pole magnetomotive force generated by the DC component of the stator armature winding without modulation is coupled with the 4-pole magnetomotive force generated by the rotor armature winding to generate the second part of the torque component; the third part of the reluctance torque component formed by the rotor armature winding and the stator salient poles; after the 4-pole magnetomotive force generated by the rotor armature winding is modulated by the rotor tooth magnetic field, the generated 5-pole magnetic field is coupled with the 5-pole magnetomotive force generated by the AC component of the stator armature winding to generate the fourth part of the torque; after the 4-pole magnetomotive force generated by the stator permanent magnet is modulated by the rotor tooth magnetic field, the generated 5-pole rotating magnetic field is coupled with the stator AC component magnetomotive force to generate the fifth part of the torque component; the 4-pole magnetomotive force generated by the stator permanent magnet is coupled with the 4-pole magnetomotive force generated by the rotor armature winding to generate the sixth part of the torque component; when the six parts of the torque act in the same direction on the rotor, the synthesized electromagnetic torque is the largest.

[0108] Under the condition that the principle of the motor remains unchanged, if Figure 1 the adopted motor stator structure is replaced with the improved structure as Figure 4 shown, the amount of permanent magnet used can be reduced, the cost can be lowered, the magnetic field distribution of the permanent magnet can be improved, and the motor can have better torque density. The magnetization directions of each permanent magnet have been marked in Figure 5 .

[0109] When a fault occurs in the rotor armature winding, the power supply to the rotor armature winding is cut off, and the motor operates as a stator permanent magnet-assisted two-phase DC-biased vernier reluctance motor. Short-time full-load operation is achieved by reconstructing the stator phase current; when a fault occurs in the stator armature winding, the power supply to the stator armature winding is cut off, and the motor operates as an 8-pole permanent magnet-assisted reluctance synchronous motor. Short-time full-load operation is achieved by reconstructing the rotor phase current. This new type of motor has strong fault tolerance and robustness.

[0110] Through the improvement of the motor structure and the addition of stator auxiliary permanent magnets, the present invention further increases the torque density of the motor. Moreover, the motor of the present invention has a simple structure, is convenient to process, has strong robustness, and has strong fault tolerance. When a fault occurs in the stator or rotor armature winding, short-time full-load operation can still be achieved by reconstructing the healthy phase current. The present invention will have a wide application prospect in application scenarios with high torque density and high fault tolerance.

[0111] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0112] The above embodiments only express several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

[0113] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and many applications other than the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined with reference to the above description, but should be determined with reference to the full scope of the foregoing claims and the equivalents thereof. For the sake of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to abandon such subject matter, nor should it be considered that the applicant has not considered such subject matter as part of the disclosed inventive subject matter.

Claims

1. A stator permanent magnet assisted double-armature winding multiple electromagnetic torque reluctance motor structure, characterized in that, It includes a stator and a rotor both of which are salient pole structures. The rotor and the stator rotate relative to each other, and an annular air gap is formed between the stator and the rotor. The stator includes a stator core, a stator armature winding, and a stator permanent magnet. The stator core includes stator teeth and a stator yoke. The stator armature winding is wound around the stator teeth in the structure of a two-phase fractional-slot concentrated winding. One stator permanent magnet is arranged on each stator tooth, or one stator permanent magnet is arranged on every other one of multiple stator teeth. The magnetic fields of all the stator permanent magnets are radial magnetic fields. The rotor includes a rotor core and a rotor armature winding. The rotor core includes rotor teeth and a rotor yoke. The rotor armature winding is wound around the rotor teeth in the structure of a three-phase fractional-slot concentrated winding. The stator armature winding is a two-phase winding, and a composite current of alternating current superimposed with a direct current component is applied. The composite current is applied to the stator armature winding in sequence according to i A+、 i B+、 i A-、 i B- ; The rotor armature winding is a three-phase winding. A three-phase symmetrical current is fed into the rotor armature winding and is fed into the rotor armature winding in sequence according to i D、 i E、 i F the order of The number of pole pairs generated by the DC component of the stator armature winding is P dc The stationary magnetomotive force of N r After magnetic field modulation by the magnetic conductance wave formed by the rotor teeth with the number of teeth of P аs When the fundamental magnetomotive force of satisfies the following relationship, torque will be generated; After an alternating current is applied to the rotor armature winding, a P ar rotating magnetic potential of the rotor with opposite poles will generate an electromagnetic torque when the number of pole pairs of the unmodulated DC magnetic potential generated by the DC component of the stator is the same, that is, when the following formula is satisfied; When the number of stator slots N s and the number of pole pairs of the rotor armature winding are P ar such that the following formula is satisfied, a reluctance torque component similar to that of a synchronous reluctance motor will be generated; After an alternating current is applied to the rotor armature winding, the P ar rotating magnetic potential of the rotor with opposite poles, after passing through the magnetic conductance wave formed by the rotor teeth with the number of teeth N r is modulated by the magnetic field. When the generated rotating magnetic field has the same number of pole pairs as the rotating magnetic potential generated by the stator alternating current component, that is, when the following formula is satisfied, an electromagnetic torque will be generated; When the pole pairs generated by the stator permanent magnet P pm of the stationary magnetomotive force are the same as those of the stationary magnetomotive force generated by the DC component of the stator armature winding P dc two additional electromagnetic torques will be generated, and the expressions are as follows: The cooperation of the stator slot number, the rotor slot number, and the number of pole pairs is as follows: The stator slot number and the rotor slot number satisfy the formula: In the formula, k 1, k 2 is an integer, m s is the number of AC phases of the stator armature winding, m r is the number of AC phases of the rotor armature winding; The expression of each phase current is: Among them, I ac is the effective value of the stator AC component, I dc is the average value of the stator DC component, ω es is the electrical angular velocity of the stator armature winding, а s is the initial phase angle of the stator, I acr is the effective value of the rotor current, ω er is the electrical angular velocity of the rotor armature winding, а r is the initial phase angle of the rotor, N r is the number of rotor slots, P ar is the number of pole pairs of the rotor armature winding, ω r is the mechanical angular velocity.

2. The stator permanent magnet assisted double-armature winding multiple electromagnetic torque reluctance motor structure according to claim 1, characterized in that, The outer contours of the rotor teeth and the rotor yoke are both concentric arc structures. The outer contours of the stator teeth and the stator yoke are both concentric arc structures. The air gap is between the rotor teeth and the stator teeth.

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