A non-working field-weakened Vernier motor with hybrid winding

Abstract

The application discloses a non-working magnetic field weakening vernier motor with mixed winding, and belongs to the technical field of permanent magnet direct drive motors. The non-working magnetic field weakening vernier motor comprises a first armature winding and a second armature winding. The winding is arranged in the split tooth area. The first armature winding is integrally wound on each main tooth, and the second armature winding is integrally wound on each split tooth, thereby forming mixed windings which do not overlap each other, so that the stator space is fully utilized. On this basis, the phase shift electric angle of the non-working harmonics between the first armature winding and the second armature winding satisfies the condition that the working harmonics of the first armature winding and the non-working harmonics of the second armature winding can be mutually cancelled, and the two sets of windings are in-phase series connection, so that a better control effect can be achieved by using one set of controller. The non-working harmonics of the vernier motor can be weakened by utilizing the tooth space without improving the topology complexity and control complexity, so that the motor power factor and overload capacity are improved.

Description

Technical Field

[0001] This invention belongs to the field of permanent magnet direct drive motor technology, and more specifically, relates to a non-working magnetic field weakening vernier motor with hybrid windings. Background Technology

[0002] Vernier permanent magnet motors are a type of motor that operates based on the principle of magnetic field modulation. Their stators often employ spur or split-tooth structures to construct modulation units, generating abundant air gap magnetic permeability harmonics. Armatures and excitation units with unequal pole pairs, under the action of the modulation units, modulate multiple working magnetic fields with the same number of pole pairs, thus contributing to the average torque and exhibiting high torque density, making them a subject of extensive research. However, non-working harmonics are also generated during the modulation process. These harmonics do not contribute to the average torque and can affect the motor's power factor and overload capacity; therefore, they need to be suppressed.

[0003] Patent CN117543867A proposes a permanent magnet vernier hub motor with dual three-phase windings. This motor improves the torque density and power factor of the vernier motor by calculating the working harmonic winding coefficients for different phase shifts and using the phase shift angle corresponding to the maximum value of the working harmonic winding coefficients as the optimal torque angle. However, this motor requires two sets of windings and two separate controllers for driving, which is very inconvenient.

[0004] Patent CN109104014A proposes a four-phase dual-winding vernier motor, which increases the winding slot area by setting windings in split teeth. However, the winding coefficients and phase differences between the two sets of windings are very large. When using a single controller for series control, the effect is very poor. It is better to use two separate controllers for control.

[0005] Patent CN120110096A proposes a six-phase motor based on hybrid windings, which can suppress stator magnetomotive force harmonics through special winding design. However, it is mainly used in traditional permanent magnet motors and cannot be directly applied to vernier motors with high torque density. Furthermore, the hybrid windings are more difficult to wind, increasing topological complexity.

[0006] Therefore, existing suppression strategies generally adopt the technical approach of increasing the number of phases and improving control accuracy, but this places higher demands on topology and control complexity. The tooth space of existing vernier permanent magnet motors is largely wasted. Even though some researchers have attempted to place windings in the tooth space, the shortcomings of these methods necessitate the use of two or more controllers to achieve satisfactory results, increasing control complexity. In summary, there is an urgent need for a method to reduce non-operating harmonics of vernier motors using the tooth space without increasing topology and control complexity. Summary of the Invention

[0007] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a vernier motor with a hybrid winding that weakens the non-working magnetic field. The purpose is to improve the motor's power factor and overload capacity by utilizing the tooth space to weaken the non-working harmonics of the vernier motor without increasing topological and control complexity.

[0008] To achieve the above objectives, the present invention provides a non-working magnetic field weakening vernier motor with hybrid windings, wherein the stator and rotor are coaxially mounted and an air gap is provided between the rotor and the stator; The stator includes: a stator core, a first armature winding, and a second armature winding; the stator core has circumferentially arranged... S Each stator main tooth has a [blank] on its end face near the air gap. k s The stator has equidistantly distributed split teeth; the first armature winding is wound entirely on each main tooth; the second armature winding is wound entirely on each split tooth; the first armature winding and the second armature winding are connected in series in phase. S Multiples of 3; ; Among them, the phase shift electrical angle of the non-working harmonics between the first armature winding and the second armature winding. satisfy:

[0009] coefficient ; Let be the number of armature non-operating harmonic pole pairs of the motor. It is an integer, and ; The number of pole pairs of the motor's excitation fundamental wave; coefficient ;coefficient ; To preset the minimum phase shift angle, it must satisfy: .

[0010] More preferably, the ratio of the number of turns of the second armature winding to the sum of the number of turns of the first armature winding and the second armature winding is... satisfy:

[0011] in, It is the sum of the cross-sectional areas of the slot space between all two adjacent stator split teeth; It is the sum of the cross-sectional areas of the slot space between all two adjacent stator main teeth. and These represent the lower and upper limits, respectively, for allowing inconsistencies in electrical density between the first and second armature windings.

[0012] More preferably, the first armature winding is a concentrated winding; the second armature winding has a span of... k s The lapped windings.

[0013] More preferably, and S satisfy:

[0014] in, These are preset coefficients.

[0015] More preferably, the number of armature fundamental pole pairs of the motor for: .

[0016] Further preferred, the number of armature operating harmonic pole pairs of the motor for: .

[0017] More preferably, the rotor employs a Hellbuck array.

[0018] More preferably, the rotor is disposed outside the stator, and the stator split teeth are disposed outside the stator core to form an inner stator structure.

[0019] More preferably, both the stator main teeth and the stator split teeth are parallel teeth.

[0020] More preferably, the stator core is made of a soft magnetic material.

[0021] In summary, the above-described technical solutions conceived in this invention can achieve the following beneficial effects: 1. This invention provides a non-working magnetic field weakening vernier motor with hybrid windings, including a first armature winding and a second armature winding. This invention fully utilizes the split-tooth region for winding arrangement; the first armature winding is entirely wound on each main tooth, and the second armature winding is entirely wound on each split tooth, forming a non-overlapping hybrid winding, thus fully utilizing the stator space. Furthermore, the phase shift electrical angle of the non-working harmonics between the first and second armature windings satisfies… This allows the working harmonics of the first armature winding and the non-working harmonics of the second armature winding to cancel each other out. Furthermore, the two sets of windings are connected in phase and can be controlled by a single controller to achieve a better control effect. This approach can reduce the non-working harmonics of the vernier motor by utilizing the tooth space without increasing the complexity of the topology and control, thereby improving the motor's power factor and overload capacity.

[0022] 2. Furthermore, considering that a large difference in electrical density between the two sets of windings can lead to many problems, such as one winding being cold while the other is overheated, resulting in performance degradation or even insulation damage and safety accidents, and failing to fully unleash the motor's performance potential, in the non-working magnetic field weakening vernier motor provided by this invention, the ratio of the number of turns of the second armature winding to the sum of the number of turns of the first and second armature windings is... satisfy: At this point, the electrical density difference between the slot winding and the harmonic weakening winding in series will not be too large, thus avoiding the aforementioned problems. 3. Further, in the non-working magnetic field weakening vernier motor provided by the present invention, the first armature winding is a concentrated winding, and the second armature winding has a span of... k s The lapped windings are such that the slot pitch angles of the first armature winding and the second armature winding are equal, and thus the short-pitch coefficients of the motor are equal.

[0023] 4. Furthermore, the parameters of the non-working magnetic field weakening vernier motor provided by the present invention are as follows: and S satisfy: This makes the winding coefficients of the non-working harmonics of the first and second armature windings as close to 0 as possible, thereby further improving the power factor of the vernier motor.

[0024] 5. Furthermore, in the non-working magnetic field weakening vernier motor provided by the present invention, the rotor adopts a Hellback array to further weaken the non-working magnetic field of the motor and improve the motor's overload capacity. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a conventional split-tooth vernier motor provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a non-working magnetic field weakening vernier motor with hybrid windings provided in an embodiment of the present invention; Figure 3 This is an enlarged view of the structural details of the non-working magnetic field weakening vernier motor provided in an embodiment of the present invention; Figure 4 The winding diagram of the slot winding of the non-working magnetic field weakening vernier motor provided in the embodiment of the present invention; Figure 5 This is a winding diagram of the harmonic weakening winding of a non-working magnetic field weakening vernier motor provided in an embodiment of the present invention; Figure 6 The topological magnetic flux density cloud diagram and magnetic field lines of the non-working magnetic field weakening vernier motor provided in the embodiments of the present invention when the winding distribution coefficient is 0; Figure 7The topological magnetic flux density map and magnetic field lines of the non-working magnetic field weakening vernier motor provided in the embodiments of the present invention when the winding distribution coefficient is 0.1; Figure 8 The topological magnetic flux density map and magnetic field lines of the non-working magnetic field weakening vernier motor provided in the embodiments of the present invention when the winding distribution factor is 0.5; Figure 9 This is a schematic diagram of a non-working magnetic field weakening vernier motor with an external rotor structure provided in an embodiment of the present invention; Figure 10 This is a graph showing the power factor of the magnetic field weakening vernier motor provided in this embodiment as a function of the line load, when the line load is the same as that of a conventional vernier motor. Figure 11 This is a graph showing the torque density of the magnetic field weakening vernier motor provided in this embodiment as a function of the line load, when the line load is the same as that of a conventional vernier motor. exist Figure 1-11 In the figures, the same reference numerals are used to denote the same elements or structures, wherein: 1-stator, 11-main tooth, 12-split tooth, 13-tooth inter-tooth, 14-slot winding, 15-harmonic weakening winding, 2-rotor, 21-rotor yoke, 22-magnet array. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0027] To achieve the above objectives, the present invention provides a non-working magnetic field weakening vernier motor with hybrid windings, wherein the stator and rotor are coaxially mounted and an air gap is provided between the rotor and the stator; The stator includes: a stator core, a first armature winding, and a second armature winding; the stator core has circumferentially arranged... S Each stator main tooth has a [blank] on its end face near the air gap. k s The stator has a split tooth; the first armature winding is wound entirely on each main tooth; the second armature winding is wound entirely on each split tooth; the first armature winding and the second armature winding are connected in phase and series. S Multiples of 3; ; Among them, the phase shift electrical angle between the first armature winding and the second armature winding satisfy:

[0028] coefficient ; Let be the number of armature non-operating harmonic pole pairs of the motor. It is an integer, and ; The number of pole pairs of the motor's excitation fundamental wave; coefficient ;coefficient ; To preset the minimum phase shift angle, it must satisfy: .

[0029] In one alternative implementation, the ratio of the number of turns of the second armature winding to the sum of the number of turns of the first armature winding and the second armature winding is... satisfy:

[0030] in, It is the sum of the cross-sectional areas of the slot space between all two adjacent stator split teeth; It is the sum of the cross-sectional areas of the slot space between all two adjacent stator main teeth. and These represent the lower and upper limits, respectively, for allowing inconsistencies in electrical density between the first and second armature windings.

[0031] In one alternative implementation, the first armature winding is a concentrated winding; the second armature winding has a span of... k s The lapped windings.

[0032] In one alternative implementation, and S satisfy:

[0033] in, These are preset coefficients.

[0034] In one alternative implementation, the number of armature fundamental pole pairs of the motor for: .

[0035] In one alternative implementation, the armature operating harmonic pole pairs of the motor are... for: .

[0036] Preferably, in one optional implementation, the rotor adopts a low harmonic excitation structure such as a Helbock array to further weaken the non-working magnetic field of the motor and improve the motor's overload capacity.

[0037] In one optional embodiment, the rotor is disposed outside the stator, and the stator teeth are disposed on the outer side of the stator core, forming an inner stator structure; in another optional embodiment, the rotor is disposed inside the stator, and the stator teeth are disposed on the inner side of the stator core, forming an outer stator structure. Option one is preferred.

[0038] It should be noted that the stator main teeth and stator split teeth can be of the following types: parallel teeth, helical teeth, split teeth, large and small teeth, etc. Preferably, in one optional embodiment, both the stator main teeth and stator split teeth are of the parallel tooth type.

[0039] Preferably, in one optional embodiment, the stator core is made of a soft magnetic material.

[0040] To further illustrate the non-working magnetic field weakening vernier motor with hybrid windings provided by the present invention, a specific embodiment is described in detail below: This embodiment provides a non-working magnetic field weakening vernier motor with hybrid windings, wherein the stator and rotor are coaxially mounted, and an air gap is provided between the rotor and the stator; The stator includes: a stator core, a first armature winding (denoted as the slot winding), and a second armature winding (denoted as the harmonic weakening winding); the stator core has circumferentially arranged... S Each stator main tooth has a [blank] on its end face near the air gap. k s The stator has a split tooth; the first armature winding is wound entirely on each main tooth; the second armature winding is wound entirely on each split tooth; the first armature winding and the second armature winding are connected in phase and series. S Multiples of 3; ; In this embodiment, on the one hand, a portion of the winding originally located in the slot is allocated to the stator split tooth section to form a harmonic weakening winding, making full use of the modulation tooth region and thus making full use of the stator space. Furthermore, the slot winding and the harmonic weakening winding constitute a non-overlapping hybrid winding, without increasing the topological complexity. On the other hand, through the ingenious design of the slot winding and the harmonic weakening winding, the phase of their non-working armature magnetic fields is kept within a certain range, thereby canceling each other out. A single controller can also be used to achieve a better control effect, reducing the non-working harmonic components in the motor under the same electrical density, and improving the motor's power factor and overload capacity.

[0041] To achieve the above objectives, on the one hand, this embodiment sets harmonic weakening windings within the equidistant split teeth of the original split-tooth vernier motor. The phase number and slot fill factor of the harmonic weakening winding and the slot winding are kept the same, and they are connected in series after being wound separately. This hybrid winding allows for better utilization of the stator space, and their ends do not overlap, thus greatly improving the integration of the motor. On the other hand, the slot pitch angle of the harmonic weakening winding is equal to that of the slot winding, and they are offset by a certain angle according to the design method proposed in this invention, so that the non-working harmonic winding coefficients of the two are similar, and the non-working harmonic phase angles of the two are also kept within a certain range, thereby allowing the harmonics to cancel each other out. A good control effect can be achieved using a single controller.

[0042] This hybrid winding configuration not only fully utilizes stator space and reduces non-operating harmonic components, thereby improving the motor's power factor and overload capacity, but also does not increase the original motor's topology and control complexity. This embodiment designs a harmonic reduction winding, mainly consisting of the following parts: 1) Positioning of the harmonic attenuation winding: like Figure 1 The diagram shows an existing split-tooth vernier motor, which includes a stator 1 and a rotor 2. The stator 1 includes main teeth 11, and each main tooth is provided with multiple split teeth 12, which are only wound in slots and are called slot windings 14.

[0043] Unlike traditional permanent magnet synchronous motors, the number of armature fundamental pole pairs in this motor is less than the number of excitation fundamental pole pairs. To ensure stable torque, several split teeth are provided under each main tooth for modulation; these split teeth are also called modulation teeth. (Number of armature fundamental pole pairs) Number of excitation fundamental pole pairs Number of stator main teeth S Number of split teeth under each main tooth k s Satisfy the following expression:

[0044] Generally, the slot windings of a split-tooth vernier motor are often arranged in a fractional-slot concentrated winding configuration. In this case, the armature possesses several large harmonics. A portion of these harmonics have the same number of pole pairs as the modulated excitation magnetic field and contribute to generating average torque; these are called operating harmonics. Another portion has a different number of pole pairs than the modulated excitation magnetic flux density and does not contribute to torque, only generating losses, leakage flux, and reducing the motor's power factor and overload capacity; these are called non-operating harmonics. Both are defined by the following formulas:

[0045]

[0046] in, Let be the number of armature non-operating harmonic pole pairs of the motor, which is an integer; This represents the number of armature operating harmonic pole pairs of the motor.

[0047] For existing split-tooth vernier motors, in order to achieve the modulation function, the modulation teeth and empty slots are arranged alternately, which will result in wasted space.

[0048] In this embodiment, a portion of the windings originally located in the slot will be allocated to the empty slot position, such as... Figure 2 The diagram shows the structure of the non-working magnetic field weakening vernier motor provided in this embodiment, including a stator 1 and a rotor 2. The stator 1 includes main teeth 11, each with multiple split teeth 12. A winding (i.e., a first armature winding) is arranged in the slot of each main tooth, called a slot winding 14. A winding (i.e., a second armature winding) is also arranged between the split teeth, called a harmonic weakening winding 15. The slot winding 14 and the harmonic weakening winding 15 are electrically insulated from each other by tooth spacing 13. This design effectively utilizes this space; the winding newly wound on the modulation teeth is called the harmonic weakening winding, and the portion of the winding still in the main slot is called the slot winding.

[0049] In this embodiment, the winding allocation factor, i.e., the turns ratio of the harmonic weakening winding to the slot winding, is:

[0050] To reduce the number of turns in the harmonic attenuation winding; The number of turns in the slot winding; Winding distribution factor Preferred satisfaction:

[0051] in, It is the sum of the cross-sectional areas of the slot space between all two adjacent stator split teeth; It is the sum of the cross-sectional areas of the slot space between all two adjacent stator main teeth. and These represent the lower and upper limits, respectively, for allowing inconsistencies in electrical density between the first and second armature windings.

[0052] The slot windings and harmonic weakening windings are separated by the tooth tips at the slot openings, forming geometric and electrical insulation. Since the winding of the harmonic weakening windings is completely independent of the slot windings still in the slots, and their geometric positions are separated by a tooth tip and a certain distance, it does not increase the complexity of the topology like traditional hybrid winding technology.

[0053] 2) Design of methods to make the non-working harmonic winding coefficients of the harmonic attenuation winding and the slot winding similar and small: The harmonic weakening winding and slot winding designed in this embodiment have the same number of phases, and the phase sequence is the same as that of the harmonic weakening winding.

[0054] Based on the equidistant setting of the modulation teeth in a split-tooth vernier motor, the non-working harmonics of the harmonic weakening winding and the slot winding can have similar winding coefficients by adjusting the harmonic weakening winding span. When the slot winding uses a concentrated winding, the harmonic weakening winding span is then set to... k s Then the slot pitch angles of the two are respectively:

[0055]

[0056] At this point, the slot pitch angles of the harmonic weakening winding and the slot winding are equal, and consequently, the short-pitch coefficients of the motor are equal.

[0057] For a split-tooth vernier motor, the distribution coefficient is often 1, therefore the expression for the armature non-working harmonic winding coefficient is:

[0058] in, This indicates the winding coefficient of the motor (the winding coefficient of the harmonic weakening winding or the slot winding, which are the same). Indicates the short-pitch coefficient of the motor; Indicates the winding slot pitch angle, specifically, Since the harmonic weakening winding and the slot winding have the same slot pitch angle, they both have the same short-pitch factor. When the distribution factor of the harmonic weakening winding is 1, they also have the same winding factor. Since the number of split teeth is generally not too large, the distribution factor is close to 1, ideally equal to 1.

[0059] Will Substitute We can obtain: ; To improve the power factor of the proposed motor, the winding coefficient should be made as close to 0 as possible. and S satisfy:

[0060] in, As a preset coefficient, in this embodiment, The value is 0.87.

[0061] 3) For designs that bring the operating harmonics and harmonic attenuation windings closer in phase: When the phase number and sequence of the harmonic attenuation winding are exactly the same as those of the slot winding, and the winding coefficients for each harmonic are the same, the relative relationship between the two windings can be determined by their phase shift angle. To ensure that the geometric position of the harmonic attenuation winding does not conflict with the position of the modulation teeth, i.e., to guarantee that the harmonic attenuation winding can be wound within the gap of the modulation tooth region, this phase shift mechanical angle must satisfy the following:

[0062] in, The mechanical angle of phase shift between the two sets of windings; n The interval between the two sets of windings is staggered.

[0063] The phase shift electrical angle is equal to the phase shift mechanical angle. times, that is:

[0064] To ensure that the non-operating harmonics of both devices cancel each other out, the phase shift electrical angle of each non-operating harmonic must be greater than 120°, and the larger the better. Therefore:

[0065] Among them, coefficient ; To preset the minimum phase shift angle, it must satisfy: .

[0066] When there exists a unique integer for each non-operating harmonic. l When the above equation is satisfied, it indicates that the non-working harmonic vector cancellation occurs between the harmonic weakening winding and the slot winding. Specifically, when... At this time, the cancellation of the slot winding and the harmonic weakening winding is quantitative, and the weakening effect of the non-working magnetic field is the best.

[0067] Furthermore, this embodiment employs a low-harmonic excitation structure such as the Haierbuck array to further weaken the non-working magnetic field of the motor and improve the motor's overload capacity.

[0068] Furthermore, this embodiment adopts an external rotor structure; when an external rotor structure is adopted, since the split teeth are located more internally and the tooth space is larger, the winding distribution coefficient can be set to be larger. Therefore, the advantages of the non-working magnetic field weakening vernier motor with hybrid winding proposed in this invention are more obvious.

[0069] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: (1) The hybrid winding setting method provided by the present invention sets a portion of the winding that was originally in the slot in the stator in the equidistant modulation tooth region, which is called the harmonic weakening winding. It not only improves the stator space utilization rate and relieves the pressure of the winding slot fill factor, but also does not interfere with the original winding in geometric position. It is only connected in series with the lead wire and does not increase the original topology complexity.

[0070] (2) The present invention provides a phase shift angle determination method, which ensures that the non-working harmonics of the harmonic weakening winding and the slot winding can cancel each other out, and a good control effect can be achieved with a single controller.

[0071] (3) The present invention provides a method for determining the winding coefficient, which ensures that the winding coefficients of the harmonic weakening winding and the slot winding are similar and both are small.

[0072] (4) Based on the hybrid winding setting method, winding coefficient determination method and phase shift angle determination method provided by this invention, this invention proposes a non-working magnetic field weakening vernier motor based on hybrid winding technology. Compared with the traditional split-tooth vernier motor, the proposed motor improves stator space utilization and weakens non-working magnetic field harmonics without increasing topological complexity and control complexity, thereby enhancing the power factor and overload capacity of the vernier motor.

[0073] In summary, the non-working magnetic field weakening vernier motor based on hybrid winding technology provided by this invention has a high power factor, strong overload capacity, is easy to manufacture and process, and is well controlled, thus possessing good engineering practical value.

[0074] To further illustrate the performance of the non-working magnetic field weakening vernier motor with hybrid windings provided by this invention, the following detailed description is provided in conjunction with specific experimental examples: This embodiment selects a superior comparative base model: For example Figure 1 The existing split-tooth vernier motor shown (i.e., conventional vernier motor) has a stator main teeth (i.e., the number of slots). S The number of armature fundamental pole pairs is 6. The number of excitation fundamental pole pairs is 2. The number is 10, with the split teeth evenly distributed under the main teeth, and the number of split teeth under each main tooth is... k s The value is 2; its slot winding adopts a fractional slot concentrated winding with a pitch of 1 and a winding factor of 0.866. Its winding diagram is as follows. Figure 3 As shown.

[0075] For example Figure 2 The non-working magnetic field weakening vernier motor with hybrid windings provided in this embodiment, as shown, has a stator main teeth (i.e., number of slots). S The number of armature fundamental pole pairs is 6. The number of excitation fundamental pole pairs is 2. The number is 12, with the split teeth evenly distributed under the main teeth, and the number of split teeth under each main tooth is... k s The value is 2. Its slot winding adopts a fractional-slot concentrated winding with a pitch of 1. The winding diagram of its slot winding is shown below. Figure 4 As shown; its harmonic weakening winding adopts a fractional slot distribution winding with a pitch of 3, and the winding diagram of its harmonic weakening winding is as follows. Figure 5 As shown. The slot winding and harmonic weakening winding of the non-working magnetic field weakening vernier motor with hybrid winding provided in this embodiment have a short-pitch factor and winding factor of 0.866. The slot winding and harmonic weakening winding have multiple non-working harmonics that can be linearly weakened, and have a good non-working magnetic field weakening effect.

[0076] The geometric parameters of a non-working magnetic field weakening vernier motor with hybrid windings were optimized. Winding allocation factors were set to 0, 0.1, and 0.5, respectively, and the magnetic flux density cloud diagrams and magnetic field lines of the motor under each winding allocation factor were obtained as follows: Figure 6 , Figure 7 and Figure 8 As shown. When the winding distribution factor is 0, it is a conventional vernier motor. As the winding distribution factor increases, the maximum magnetic flux density of the motor yoke decreases. This is because the harmonic weakening winding's non-working magnetic field harmonics and the slot winding's non-working magnetic field harmonics cancel each other out, resulting in a decrease in the yoke's magnetic flux density.

[0077] This embodiment selects a vernier motor with a Hellbuck array and an external rotor structure as the basic model, and sets up a hybrid winding to form a non-working magnetic field weakening vernier motor with a hybrid winding, such as... Figure 9 As shown. Taking a winding allocation factor of 0.3, when the line load of the magnetic field weakening vernier motor provided in this embodiment is the same as that of a conventional vernier motor, its power factor and torque density change with the line load as shown below. Figure 10 and Figure 11 As shown in the figure, the power factor and overload capacity of the non-working magnetic field weakening vernier motor provided in this embodiment are better than those of the conventional vernier motor topology. This is because the non-working harmonics inside the motor are weakened, and this phenomenon will become more obvious as the line load increases further.

[0078] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A vernier motor with a weakened non-working magnetic field and hybrid windings, characterized in that, Its stator and rotor are coaxially mounted, and an air gap is provided between the rotor and the stator; The stator includes: a stator core, a first armature winding, and a second armature winding; the stator core has circumferentially arranged... S Each stator main tooth has a [blank] on its end face near the air gap. k s The stator has equidistantly distributed split teeth; the first armature winding is wound entirely on each main tooth; the second armature winding is wound entirely on each split tooth; the first armature winding and the second armature winding are connected in series in phase; S Multiples of 3; ; Wherein, the phase shift electrical angle of the non-operating harmonics between the first armature winding and the second armature winding. satisfy: coefficient ; Let be the number of armature non-operating harmonic pole pairs of the motor. It is an integer, and ; The number of pole pairs of the excitation fundamental wave of the motor; coefficient ;coefficient ; To preset the minimum phase shift angle, it must satisfy: .

2. The non-working magnetic field weakening vernier motor according to claim 1, characterized in that, The ratio of the number of turns of the second armature winding to the sum of the number of turns of the first armature winding and the second armature winding. satisfy: in, It is the sum of the cross-sectional areas of the slot space between all two adjacent stator split teeth; It is the sum of the cross-sectional areas of the slot space between all two adjacent stator main teeth; and These represent the lower and upper limits, respectively, for allowing inconsistencies in electrical density between the first armature winding and the second armature winding.

3. The non-working magnetic field weakening vernier motor according to claim 1, characterized in that, The first armature winding is a concentrated winding; the second armature winding has a span of... k s The lapped windings.

4. The non-working magnetic field weakening vernier motor according to claim 3, characterized in that, and S satisfy: in, These are preset coefficients; The value is 0.

87.

5. The non-working magnetic field weakening vernier motor according to any one of claims 1-4, characterized in that, The number of armature fundamental pole pairs of the motor for: .

6. The non-working magnetic field weakening vernier motor according to any one of claims 1-4, characterized in that, The armature operating harmonic pole pairs of the motor for: .

7. The non-working magnetic field weakening vernier motor according to any one of claims 1-4, characterized in that, The rotor uses a Hellbuck array.

8. The non-working magnetic field weakening vernier motor according to any one of claims 1-4, characterized in that, The rotor is disposed outside the stator, and the stator split teeth are disposed on the outside of the stator core, forming an inner stator structure.

9. The non-working magnetic field weakening vernier motor according to any one of claims 1-4, characterized in that, Both the stator main teeth and the stator split teeth are parallel teeth.

10. The non-working magnetic field weakening vernier motor according to any one of claims 1-4, characterized in that, The stator core is made of a soft magnetic material.

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