A pulse width modulation function profile magnetic pole and damping coil combined structure

Abstract

The present application belongs to the technical field of power generation, power transformation or power distribution, and discloses a pulse width modulation type function profile magnetic pole and damping coil combined structure, which comprises a damping coil, the damping coil and the pulse width modulation type function profile magnetic pole are alternately distributed, the pulse width modulation type function profile magnetic pole is arranged at the top end of a magnetic pole main body, and the contour line of the pulse width modulation type function profile magnetic pole is an arc which coincides with the profile line of the pulse width modulation type function profile magnetic pole.The present application has the advantages of high integration of the magnetic pole and the damping coil, and the influence of the coil mounting groove and the channel on the main magnetic circuit is weakened.The pulse width modulation type function profile magnetic pole is a simple rectangular combination, which is easy to process; the air gap magnetic field waveform is improved, and the magnetic conductance is improved; the damping coil is embedded in the channel and the groove in the pulse width modulation type function profile magnetic pole, which improves the utilization rate of the magnetic pole space and avoids the influence of the damping coil on the main magnetic circuit.

Description

Technical Field

[0001] This invention belongs to the technical field of power generation, power transformation or power distribution, and specifically relates to a combination structure of pulse width modulation functional shape magnetic pole and damping coil. Background Technology

[0002] Since the invention of the electric motor, the types and products of electric motors have been continuously enriched, such as DC motors, induction motors, synchronous motors, switched reluctance motors, field-modulated motors, superconducting motors, and ultrasonic motors, which have played an important role in the electrical age of mankind.

[0003] From the perspective of operating principles, most motors achieve electromechanical energy conversion based on the principle of electromagnetic induction. From the structural perspective of major components such as the stator and rotor (mover), existing motors generally have salient or non-salient pole characteristics, especially the magnetic poles that generate the excitation magnetic field or main magnetic field (hereinafter referred to as "magnetic poles"), where the salient or non-salient pole characteristics are more pronounced. Generators typically pursue better power quality, such as a higher sinusoidal output voltage; motors typically pursue better operating performance, such as smoother speed and torque.

[0004] To achieve the above objectives, those skilled in the art commonly employ techniques such as reshaping the magnetic pole profile, for example, into bread-shaped, olive-shaped, cosine-shaped, or large-and-small-tooth configurations. The main purpose is to obtain a magnetic field waveform or permeability waveform containing higher operating harmonic components or a magnetic field waveform or permeability waveform with specific harmonic components, thereby achieving smoother torque or the desired back EMF waveform. Chinese Patent (Publication No. CN112821700A) disclosed on May 18, 2021, a dual cosine air-gap flux-switching servo motor, whose rotor salient pole outer profile is cosine-shaped. Flux-switching motors designed based on this technology exhibit extremely low torque ripple and positioning torque. Classic books in this field, such as *Electrical Machines* (by Tang Yunqiu) and *Rotating Electrical Machines Design* (by Juha Pirone, Tapani Iokinen, Valeria Labovoska, et al.), both mention that changing the shape of the rotor magnetic pole shoes can yield a more sinusoidal air-gap magnetic field. While the aforementioned technologies have been widely adopted, they have limitations. For example, arc machining and partial chamfering require higher processing techniques, and machining errors can cause the actual performance of the motor to deviate from the expected performance, which is detrimental to improving production efficiency and product qualification rate. Furthermore, damping coils are widely used in generators to suppress the adverse effects of load disturbances and short circuits, thereby improving the generator's operational stability. In the technology described in "A Magnetic Pole Core with Damping Strips for a High-Speed ​​Rotating Salient Pole Generator" (Authorization Announcement No. CN104505959B), the damping plate is connected to the magnetic pole tie rod, resulting in high integration. However, through slots are opened on the outer surface of the magnetic pole, which will affect the main magnetic circuit and the air gap magnetic field waveform. Similarly, "A Damping Winding for a Synchronous Motor" (Authorization Announcement No. CN105896779B) and "A Method for Manufacturing a Damping Winding for a Salient Pole Synchronous Motor" (Publication No. CN114400848A) respectively propose a method for manufacturing a damping winding for a synchronous motor and a method for manufacturing a damping winding for a salient pole synchronous motor, which have good application value, but both suffer from problems affecting the main magnetic circuit.

[0005] Therefore, the rational design of the magnetic pole shape and damping coil is one of the important tasks in this field. Although existing reports have disclosed a wealth of design examples, there are two shortcomings:

[0006] 1. The machining of complex magnetic pole shapes is difficult and the ease of machining is also ignored. In particular, the machining of complex shapes such as multi-segment arcs, olive shapes, and bread shapes is highly dependent on precision. Once a deviation occurs, the performance of the motor after machining will change unpredictably, and in severe cases, the workpiece will be scrapped.

[0007] 2. Traditional damping coil design relies heavily on experience, and the design of magnetic pole shape and damping coil lacks overall consideration. That is, the two are always designed, processed and assembled independently. This leads to the neglect of the influence of damping coil mounting slots and channels on the main magnetic circuit, and the low utilization rate of magnetic pole space, which is not conducive to the economical use of metal resources such as iron, aluminum, copper and stainless steel.

[0008] In summary, designing a motor pole and damping coil combination structure with good operating performance and high integration is crucial for improving the operational quality of motor systems. This invention provides a pulse-width modulation (PWM) functional shape pole and damping coil combination structure, which has significant theoretical and engineering value for improving motor performance, inspiring those skilled in the art to innovate in other motor products, and promoting motor design and optimization technologies and industrial applications. Summary of the Invention

[0009] To address the shortcomings of existing technologies, the present invention aims to provide a pulse-width modulated functional shape magnetic pole and damping coil combination structure, which solves the problems mentioned in the background art.

[0010] The objective of this invention can be achieved through the following technical solutions:

[0011] A combination structure of pulse width modulation (PWM) functional shape magnetic poles and damping coils includes a damping coil, wherein the damping coil and PWM functional shape magnetic poles are alternately distributed, the PWM functional shape magnetic poles are disposed at the top of the magnetic pole body, and the outline of the PWM functional shape magnetic poles is an arc, which coincides with the outline of the PWM functional shape magnetic poles.

[0012] Preferably, the damping coil and the pulse width modulation (PWM) functional shape magnetic pole are installed in different intervals. The main magnetic pole is divided into two intervals: the damping coil curve interval and the PWM functional shape magnetic pole interval. The range of the interval is determined by the modulation of the periodic modulation wave and the PWM functional shape magnetic pole profile.

[0013] A pulse-width modulation (PWM) shape includes a PWM function shape magnetic pole profile, wherein the PWM function shape magnetic pole profile is symmetrical about a symmetry line of the PWM function shape magnetic pole profile, and its unfolded form is as follows: Where y0 is the amplitude of the DC component, y i f is the amplitude of the i-th component. i Let be the frequency of the i-th component.

[0014] A single-unit damping coil structure includes a damping coil, wherein the two ends of each single-unit damping coil are fixedly connected to the end conductor of the damping coil, and the outer sides of the damping coils coincide with or are lower than the pulse width modulation function shape magnetic pole outline.

[0015] Preferably, the material of the end conductor of the damping coil is the same as that of the damping coil, and the total metal mass of the single damping coil and the end conductor of the damping coil is 10% to 30% of the excitation (or armature) winding.

[0016] A single-unit damping coil structure includes a damping coil in which a circular damping coil is installed at the lower end of the damping coil section. Instead of embedding the damping coil in the damping coil section near the symmetrical line of the magnetic pole profile of the pulse width modulation function, the circular damping coil is installed at its lower end.

[0017] Preferably, the two ends of the circular damping coil are fixedly connected to the end conductor of the damping coil, and the outer sides of the damping coil coincide with or are lower than the outline of the pulse width modulation function magnetic pole.

[0018] An integral damping coil structure includes a damping coil located between two end connecting rings of the damping coil. The two ends of the damping coil are fixedly connected to the end connecting rings of the damping coil to form a tight integral structure.

[0019] Preferably, the material of the end connecting ring of the damping coil is the same as that of the damping coil, and the end connecting ring of the damping coil is a circular ring structure. The outer side of the circular ring of the end connecting ring of the damping coil coincides with or is lower than the outline of the magnetic pole of the pulse width modulation function.

[0020] Preferably, an endplate type damping coil structure includes a damping coil located between a front damping coil endplate and a rear damping coil endplate. The two ends of the damping coil are fixedly connected to the front damping coil endplate and the rear damping coil endplate to form a tight whole. The outer sides of the damping coil are all aligned with or below the pulse width modulation function shape magnetic pole outline.

[0021] The beneficial effects of this invention are:

[0022] A pulse-width modulation (PWM) functional shape magnetic pole and damping coil combination structure is disclosed, which has the advantage of high integration of magnetic pole and damping coil, and reduces the influence of coil mounting slots and channels on the main magnetic circuit. The PWM functional shape magnetic pole is a simple rectangular combination, which is easy to manufacture; it improves the air gap magnetic field waveform and magnetic permeability, making it possible to achieve "magnetic field waveforms or magnetic permeability waveforms with higher operating harmonic components" or "magnetic field waveforms or magnetic permeability waveforms with specific harmonic components" in terms of both principle and technology; the damping coil is embedded in the channels and slots of the PWM functional shape magnetic pole, which not only improves the utilization of magnetic pole space, but also avoids the influence of the damping coil on the main magnetic circuit. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a plan view of a pulse width modulation function-shaped magnetic pole and damping coil combination structure according to the present invention;

[0025] Figure 2 This is a schematic diagram of the pulse width modulation (PWM) shape in the combined structure of the PWM function shape magnetic pole and damping coil of the present invention.

[0026] Figure 3 This is an overall structural diagram of the stator (or rotor) with a combination structure of eight pulse width modulation functional shape magnetic poles and single-unit damping coils in Embodiment 1 of the present invention.

[0027] Figure 4 for Figure 3 The front view;

[0028] Figure 5 for Figure 3 Top view;

[0029] Figure 6 This is a front view and a partial enlarged view of the pulse width modulation function-shaped magnetic pole in Embodiment 1 of the present invention;

[0030] Figure 7 This is a structural diagram of the damping coil in Embodiment 1 of the present invention;

[0031] Figure 8 This is a cross-sectional view of the stator (or rotor) of Embodiment 2 of the present invention, which has a combination structure of eight pulse width modulation functional shape magnetic poles and a single-unit damping coil.

[0032] Figure 9 This is a structural diagram of the stator (or rotor) with an eight pulse width modulation functional shape magnetic poles and an integral damping coil combination structure in Embodiment 3 of the present invention.

[0033] Figure 10 This is a front view of the stator (or rotor) with an eight pulse width modulation functional shape magnetic pole and an integral damping coil combination structure in Embodiment 3 of the present invention;

[0034] Figure 11 This is a structural diagram of the integral damping coil in Embodiment 3 of the present invention;

[0035] Figure 12 This is an overall structural diagram of the stator (or rotor) with a combination structure of eight pulse width modulation functional shape magnetic poles and end plate damping coils in Embodiment 4 of the present invention.

[0036] Figure 13 for Figure 12 The front view;

[0037] Figure 14 for Figure 12 Exploded view;

[0038] Figure 15 This is a comparison diagram of the air gap magnetic flux density harmonics generated by the magnetic poles before and after the implementation of this invention. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0041] like Figure 1 As shown, Figure 1 This is a planar diagram of a pulse-width modulated function-shaped magnetic pole and damping coil combination structure.

[0042] A combination structure of pulse-width modulation (PWM) functional shape magnetic poles and damping coils includes a damping coil 1, PWM functional shape magnetic poles 2, a magnetic pole body 4, and an excitation (or armature) winding 5. The damping coil 1 and the PWM functional shape magnetic poles 2 are alternately distributed, and the outline of the PWM functional shape magnetic poles 2 is an arc, coinciding with the outline line 304 of the PWM functional shape magnetic poles.

[0043] The damping coil 1 is usually made of high-conductivity, low-magnetic-permeability materials such as copper, brass, and aluminum. The pulse-width modulation (PWM) functional shape magnetic pole 2 is usually made of high-magnetic-permeability materials such as silicon steel and iron-nickel alloy. The permeability of the PWM functional shape magnetic pole 2 is usually 100 to 10,000 times that of the damping coil 1.

[0044] The pulse-width modulation (PWM) functional shape magnetic pole 2 is part of the magnetic pole body 4, made of the same material, and is usually a thin sheet laminate structure. The thickness of the sheet depends on the actual needs, and currently there are different specifications such as 0.05mm, 0.1mm, 0.35mm, and 0.5mm. The main purpose is to reduce the core loss of the magnetic pole body 4. In large-size motors, for ease of processing, the PWM functional shape magnetic pole 2 and the magnetic pole body 4 can be machined separately and then spliced ​​using reserved slots, rarely using welding.

[0045] The excitation (or armature) winding 5 has reliable insulation. Its material, wire diameter, wire shape, number of turns and insulation level are designed according to actual needs. It is then wound around the magnetic pole body 4, or it can be prefabricated into the desired shape and nested in the magnetic pole body 4. Its main purpose is to generate an excitation (or armature) magnetic field.

[0046] The excitation (or armature) winding 5 can be a copper winding, an aluminum winding, or a superconducting winding composed of a superconducting coil.

[0047] like Figure 2 As shown, Figure 2 This is a schematic diagram of the pulse width modulation (PWM) shape in a combination structure of a PWM function shape magnetic pole and a damping coil.

[0048] To facilitate the implementation of this invention in different motors, the pulse width modulation function's magnetic pole contour line 3 is plotted on an xy rectangular coordinate system, where the horizontal axis (x-axis) represents position and the vertical axis (y-axis) represents amplitude. (See attached...) Figure 2 In the upper part, the periodic modulation wave 7 and the pulse width modulation function shape magnetic pole contour line 3 are drawn together. The peak value δc of the periodic modulation wave is greater than or equal to the peak value δr of the pulse width modulation function shape magnetic pole contour line, and the ratio can be 0.6 to 1. The periodic modulation wave 7 can be a triangular periodic wave or a sawtooth periodic wave. Its number of periods should be at least twice the number of periods of the pulse width modulation function shape magnetic pole contour line 3, and is usually more than 10 times. When the size of the magnetic pole body 4 is large, this multiple can be further increased, as long as it is easy to process.

[0049] The magnetic pole profile 3 of a pulse-width modulation (PWM) function is typically designed as a sine (cosine), quadratic, linear, or arbitrary function. The choice of this function depends on the objective to be achieved by those skilled in the art, which has been summarized in the background art. However, the magnetic pole profile 3 of a PWM function typically needs to be symmetrical about the center of the symmetry line of the PWM function's magnetic pole profile to avoid generating unbalanced magnetic pull, and can be expanded into the following form: Where y0 is the amplitude of the DC component, y i f is the amplitude of the i-th component. iLet f be the frequency of the i-th component. (Its period is easily calculated). In this case, the number of periods of the periodically modulated wave 7 must be at least f. i For a period of 2 times, it is often taken to be more than 10 times. When the size of the magnetic pole body 4 is large, this multiple can be further increased, as long as it is easy to process.

[0050] As can be seen, there will be a series of intersections between the periodically modulated wave 7 and the pulse width modulation (PWM) function's magnetic pole contour line 3, namely, intersection point 6. Using this intersection point as the interval division point, the planar development line 301 of the PWM function's magnetic pole contour line is divided into two types of intervals: the damping coil 1 interval and the PWM function's magnetic pole 2 interval. In the damping coil 1 interval, the waveform of the periodically modulated wave 7 is higher than the waveform of the PWM function's magnetic pole contour line 3. Damping coil conductors 101, 102, 103, and 104 are set in this interval. All the damping coil conductors are connected at their ends to form damping coil 1. In the PWM function's magnetic pole 2 interval, the waveform of the PWM function's magnetic pole contour line 3 is higher than the waveform of the periodically modulated wave 7. Pulse widths 201, 202, 203, and 204 are set in this interval.

[0051] The heights of pulse widths 201, 202, 203, and 204 are equal to the equivalent peak value δc2 of the magnetic pole shape of the pulse width modulation function and the peak value δr of the magnetic pole contour line of the pulse width modulation function. The relationship between these values ​​can be determined according to the principle of equal area, that is, the area within the same damping coil 1 interval should be equal to the area enclosed by the magnetic pole contour line of the pulse width modulation function.

[0052] Combination Figure 1 and Figure 2 Those skilled in the art can easily understand the formation process of pulse width modulation function shape magnetic poles. The following will explain how to apply it with specific embodiments.

[0053] Example 1:

[0054] like Figure 3 As shown, Figure 3 It is an overall structural diagram of a stator (or rotor) with a combination of eight pulse width modulation function-shaped magnetic poles and a single-unit damping coil.

[0055] The stator (or rotor) has an eight-pole structure, containing four pairs of magnetic poles symmetrically distributed at 45° intervals in space. The eight pole bodies 4 are connected to multiple yokes 8, and the yokes 8 are made of the same material as the pole bodies 4. In large-size motors, for ease of manufacturing, the pole bodies 4 and yokes 8 can be machined separately and then joined using pre-reserved slots. At the center of the structure, a pole center 9 is provided for mounting a rotating shaft or a fixed shaft. When used as a rotor, this structure mounts a rotating shaft; when used as a stator, it mounts a fixed shaft or other fixed components.

[0056] In this structure, eight individual damping coils 1 are provided. Each individual damping coil 1 is connected through a damping coil end conductor 1010. The material of the damping coil end conductor 1010 is the same as that of the damping coil 1. They can be set by fixed connection or integrated manufacturing, as long as reliable mechanical strength and current carrying capacity are guaranteed. The total metal mass of the eight individual damping coils 1 and the damping coil end conductor 1010 should be 10% to 30% of the excitation (or armature) winding 5.

[0057] like Figure 4-6 As shown, Figure 4 for Figure 3 Front view, Figure 5 for Figure 3 Top view, Figure 6 The images show a front view and a partial enlarged view of the pulse width modulation function's external magnetic poles in Embodiment 1 of the present invention.

[0058] It can be seen that the outline 304 of the stator (or rotor) with the combination structure of eight pulse width modulation function shape magnetic poles and single-unit damping coil is still a standard circle. This result shows that in the traditional technical means, the magnetic field and magnetic permeability adjustment process that relies on shape modification is replaced by the aforementioned pulse width modulation shape process. The latter only needs to divide the magnetic pole space into two intervals (damping coil 1 interval and pulse width modulation function shape magnetic pole 2 interval) and reasonably allocate the materials in the intervals to achieve the adjustment of the magnetic field and magnetic permeability, and obtain "magnetic field waveform or magnetic permeability waveform containing higher working harmonic components" or "magnetic field waveform or magnetic permeability waveform with specific harmonic components". This will greatly facilitate the design, processing and assembly process of the motor.

[0059] like Figure 7 As shown, Figure 7 This is a structural diagram of the damping coil in Embodiment 1 of the present invention.

[0060] It can be seen that the cross-sectional area of ​​the conductor in the middle of the single-unit damping coil 1 is small, while the cross-sectional area of ​​the conductors on both sides is large. When the motor experiences asymmetrical operation or short circuit fault, this structure will also improve the generated damping magnetic field.

[0061] Example 2:

[0062] For two reasons:

[0063] 1. High-power motors only use Figure 7 The damping coil structure in the design may not be able to meet the actual needs due to its current carrying capacity.

[0064] 2. As the ratio of the number of cycles of the periodic modulation wave 7 to the number of cycles of the pulse width modulation function's outer magnetic pole contour line 3 increases, the damping coil 1 interval near the symmetry line 302 of the pulse width modulation function's outer magnetic pole contour line may become too narrow or too deep, which is not conducive to the installation and placement of the damping coil 1.

[0065] Taking the above two points into consideration, the following proposal is attached. Figure 8 Example 2 is shown.

[0066] like Figure 8 As shown, Figure 8 This is a cross-sectional view of a stator (or rotor) with a combination of eight pulse width modulation functional shape magnetic poles and a single-unit damping coil structure.

[0067] This structure is based on Embodiment 1, with the addition of a circular damping coil 1011. The circular damping coil 1011 is installed on the lower side of the damping coil 1 section, and its shape is generally circular, but it can also be designed into other shapes as needed. In this structure, the damping coil 1 section near the symmetry line 302 of the magnetic pole contour line of the pulse width modulation function will no longer contain the damping coil 1, but instead the circular damping coil 1011 will be installed on its lower side. The circular damping coil 1011 is still connected through the damping coil end conductor 1010 to achieve the damping effect.

[0068] It can be seen that in this structure, the damping coil has a stronger current carrying capacity, and the shape of the pulse width modulation function shape magnetic pole 2 is not destroyed, so the adjustment function of magnetic field and magnetic permeability can still be guaranteed.

[0069] Example 3:

[0070] like Figure 9 As shown, Figure 9 This is a structural diagram of a stator (or rotor) with a combination of eight pulse width modulation functional shape magnetic poles and an integral damping coil.

[0071] The difference from Embodiment 1 and Embodiment 2 is that the damping coil 1 adopts an integral structure. The damping coil 1 and the damping coil end connecting ring 1012 are connected in a fixed manner to form a tight whole. The tightness refers to reliable electrical contact and stable mechanical connection.

[0072] like Figure 10-11 As shown, Figure 10This is a front view of a stator (or rotor) with an eight-pulse-width modulated functional shape magnetic pole and an integral damping coil combination structure. Figure 11 This is a structural diagram of the integral damping coil in Embodiment 3 of the present invention.

[0073] The material of the integral damping coil end connecting ring 1012 is the same as that of the damping coil 1, and it has a circular structure. The outer side of the ring coincides with or is lower than the pulse width modulation function shape magnetic pole outline 304 to avoid affecting the operation of the motor. The thickness and height of the ring are designed according to the actual current carrying requirements.

[0074] Example 4:

[0075] like Figure 12-14 As shown, Figure 12 This is a structural diagram of a stator (or rotor) with a combination of eight pulse width modulation functional shape magnetic poles and endplate damping coils. Figure 13 for Figure 12 Front view, Figure 14 for Figure 12 Exploded view.

[0076] The damping coil 1 adopts an end plate type damping coil structure, that is, the damping coil 1 is located between two damping end plates (front damping coil end plate 10 and rear damping coil end plate 11). The damping coil 1, the front damping coil end plate 10 and the rear damping coil end plate 11 are connected in a fixed manner to form a tight whole. The tightness refers to reliable electrical contact and stable mechanical connection.

[0077] The materials of the front damping coil end plate 10 and the rear damping coil end plate 11 can be the same as those of the damping coil 1, or other materials with high conductivity and low magnetic permeability. However, it is essential to ensure that the damping coil 1, the front damping coil end plate 10, and the rear damping coil end plate 11 form a tight whole. The shapes of the front damping coil end plate 10 and the rear damping coil end plate 11 can be designed with reference to the magnetic pole body 4 and the magnetic yoke 8, and the thickness can be designed according to the actual current carrying requirements.

[0078] Both Example 3 and Example 4 effectively enhanced damping.

[0079] Furthermore, the invention is implemented in an actual motor magnetic pole, with the ratio of the number of cycles of the periodic modulation wave (7) to the number of cycles of the pulse width modulation function-shaped magnetic pole contour line (3) set to 20. Figure 15 The diagram shows a comparison of the air gap magnetic flux density harmonics generated by the magnetic poles before and after the implementation of this invention. For ease of comparison, the fundamental value of the air gap magnetic flux density before implementation was used as the base value, and per-unit processing was performed. The magnetic pole structure before implementation is named "original structure", and the magnetic pole structure after implementation is named "modulated structure".

[0080] It can be seen that after adopting the modulation structure of the present invention, the waveform distortion rate of the air gap magnetic flux density is reduced by about 45%, while the amplitude of the fundamental wave (first harmonic) increases by about 10%, and other harmonics (odd harmonics greater than 1) are reduced to varying degrees, with reduction rates ranging from 5% to 50%. Therefore, the present invention significantly increases the proportion of the fundamental wave while reducing unwanted harmonic components. It can be considered that the pulse width modulation functional shape magnetic pole and damping coil combination structure of the present invention has good application value and prospects.

[0081] The above descriptions are merely four embodiments of the present invention, more specifically, embodiments implemented in a stator (or rotor) having a combination structure of eight pulse width modulation functional shape magnetic poles and a single-unit damping coil. However, this is not intended to limit the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are permitted. For example, combining the damping coil 1, damping coil end conductor 1010, integral damping coil end connecting ring 1012, front damping coil end plate 10, and rear damping coil end plate 11 in the four embodiments to form new components; changing the number of magnetic poles to other numbers; or selecting only a limited number of damping coil conductors to form the damping coil. Especially when the estimated conductor current (current density) in the damping coil is relatively large, the damping coil 1 section near the symmetry line 302 of the pulse width modulation functional shape magnetic pole outline is usually not provided with damping conductors, but instead retains a hollow structure. However, as long as the additional... Figure 2 The pulse width modulation (PWM) shape principle in the combined structure of the PWM function shape magnetic pole and damping coil shown, which enables the adjustment of the air gap magnetic field and magnetic permeability, should be included within the protection scope of this invention.

[0082] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above 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 one or more embodiments or examples.

[0083] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A pulse-width modulated functional shape magnetic pole and damping coil combination structure, comprising a damping coil (1), characterized in that, The damping coil (1) and the pulse width modulation function shape magnetic pole (2) are alternately distributed. The pulse width modulation function shape magnetic pole (2) is set at the top of the magnetic pole body (4). The outline of the pulse width modulation function shape magnetic pole (2) is an arc, which coincides with the outline of the pulse width modulation function shape magnetic pole (304). The damping coil (1) and the pulse width modulation (PWM) functional shape magnetic pole (2) are installed in different intervals. The main magnetic pole is divided into two intervals, namely the damping coil curve interval and the PWM functional shape magnetic pole interval. The range of the interval is determined by the modulation of the periodic modulation wave (7) and the PWM functional shape magnetic pole contour line (3). The periodic modulation wave (7) is a triangular periodic wave or a sawtooth periodic wave, and its number of periods is twice the number of periods of the PWM functional shape magnetic pole contour line (3). The magnetic pole profile (3) of the pulse width modulation function is centrally symmetrical about the symmetry line (302) of the magnetic pole profile of the pulse width modulation function, and its unfolded form is as follows: Where y0 is the amplitude of the DC component, y i Let be the amplitude of the i-th component. f i Let be the frequency of the i-th component.

2. The pulse width modulation functional shape magnetic pole and damping coil combination structure according to claim 1, characterized in that, The damping coil (1) is a single-unit structure. The two ends of each damping coil (1) are fixedly connected to the damping coil end conductor (1010), and the outer sides of the damping coil (1) are all aligned with or below the pulse width modulation function shape magnetic pole outline line (304).

3. The pulse width modulation functional shape magnetic pole and damping coil combination structure according to claim 2, characterized in that, The material of the damping coil end conductor (1010) is the same as that of the damping coil (1), and the total metal mass of the single damping coil (1) and the damping coil end conductor (1010) is 10% to 30% of the excitation winding or armature winding.

4. The pulse width modulation functional shape magnetic pole and damping coil combination structure according to claim 3, characterized in that, A circular damping coil (1011) is installed at the lower end of the damping coil (1) section of the single-unit type. The damping coil (1) is no longer embedded in the damping coil (1) section near the symmetry line (302) of the magnetic pole contour line of the pulse width modulation function. Instead, the circular damping coil (1011) is installed at its lower end.

5. The pulse-width modulation functional shape magnetic pole and damping coil combination structure according to claim 4, characterized in that, The two ends of the circular damping coil (1011) are fixedly connected to the damping coil end conductor (1010), and the outer sides of the damping coil (1) are all aligned with or below the pulse width modulation function shape magnetic pole outline line (304).

6. The pulse-width modulation functional shape magnetic pole and damping coil combination structure according to claim 1, characterized in that, The damping coil (1) is an integral structure. The damping coil (1) is located between the two damping coil end connecting rings (1012), and the two ends of the damping coil (1) and the damping coil end connecting rings (1012) are connected by a fixed connection to form a tight whole. The material of the damping coil end connecting ring (1012) is the same as that of the damping coil (1). The damping coil end connecting ring (1012) is a circular ring structure. The outer side of the circular ring of the damping coil end connecting ring (1012) coincides with or is lower than the pulse width modulation function shape magnetic pole outline line (304).

7. The pulse width modulation functional shape magnetic pole and damping coil combination structure according to claim 1, characterized in that, The damping coil (1) has an end plate structure. The damping coil (1) is located between the front damping coil end plate (10) and the rear damping coil end plate (11). The two ends of the damping coil (1) are connected to the front damping coil end plate (10) and the rear damping coil end plate (11) in a fixed manner to form a tight whole. The outer sides of the damping coil (1) are all coincident with or lower than the pulse width modulation function shape magnetic pole outline line (304).

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