CN116365757B

CN116365757B - Hollow cup motor

Info

Publication number: CN116365757B
Application number: CN202310640593.7A
Authority: CN
Inventors: 韩利伟; 谭啸天; 耿文骥; 闫小珅
Original assignee: Suzhou Xinling Meide Medical Technology Co ltd
Current assignee: Suzhou Xinling Meide Medical Technology Co ltd
Priority date: 2023-06-01
Filing date: 2023-06-01
Publication date: 2023-08-08
Anticipated expiration: 2043-06-01
Also published as: CN116365757A

Abstract

The invention provides a hollow cup motor. The hollow cup motor comprises a stator and a rotor, wherein the stator comprises an iron core and a winding, the iron core is provided with a through cavity, the winding is attached to the inner wall of the cavity, the rotor comprises a permanent magnet arranged in the center of the cavity, an air gap is formed between the winding and the permanent magnet, the cavity is of a regular polygon cylinder structure, the permanent magnet is of a regular cylinder structure, the permanent magnet is suitable for rotating along the central axis of the cavity, and the radial distance between the winding and the permanent magnet changes in a sinusoidal curve around the circumference. By adopting the invention, the distance from the permanent magnet to the winding is changed from equidistant to sinusoidal, the air gap magnetic field is also changed to sinusoidal, the higher order harmonic component of back electromotive force is reduced, the excessive electromagnetic loss and vibration caused by harmonic waves in the working process of the motor are reduced, and the working efficiency of the motor is improved.

Description

Hollow cup motor

Technical Field

The invention relates to the technical field of hollow cup motors, in particular to an improved hollow cup motor.

Background

The hollow cup motor can be used as a micro motor in the medical field, has the characteristics of high rotating speed and low torque, and can work in a small space and a complex space.

In the existing hollow cup motor, a cylindrical iron core with a slotless structure is mostly adopted, a winding is adhered to form a cylinder by glue and fixed on the inner wall of the cylindrical iron core to form a stator, a rotor adopts a cylindrical permanent magnet and is arranged at the center of the stator, and in the assembly structure, air gaps between the winding and the rotor are uniformly distributed. When the motor is in idle load, the counter electromotive force is shown in figure 1, the horizontal axis represents time, the vertical axis represents counter electromotive force, the unit is V, the waveform presents flat top wave, and the sine property of the counter electromotive force is poor; further, the counter electromotive force (the counter electromotive force is mainly composed of fundamental waves and higher harmonics) is subjected to fourier decomposition, and as shown in fig. 2, the horizontal axis represents frequency in kHz, and the vertical axis represents normalized induced voltage after fourier decomposition, it can be seen from fig. 2 that higher harmonic components are large. In this case, when the motor is loaded, excessive electromagnetic loss is generated, vibration of the motor is caused, loss of the motor is increased, and working efficiency of the motor is reduced.

Disclosure of Invention

The technical problem solved by the embodiment of the invention mainly lies in how to improve the working efficiency of the motor through the structural design of the iron core, the winding and the permanent magnet.

In order to solve the technical problems, the embodiment of the invention provides an improved hollow cup motor. The hollow cup motor comprises a stator and a rotor, wherein the stator comprises an iron core and a winding, the iron core is provided with a through cavity, the winding is attached to the inner wall of the cavity and is arranged, the rotor comprises a permanent magnet arranged in the center of the cavity, and an air gap is formed between the winding and the permanent magnet; the winding comprises at least three phase windings, each phase winding comprises at least one winding coil connected in series, each winding coil comprises a positive electrode coil and a negative electrode coil which are symmetrically arranged relative to the central axis of the cavity, each positive electrode coil and each negative electrode coil respectively comprise a plurality of single-turn coils, and each single-turn coil is provided with at least 10 side edges.

Optionally, the cavity is a regular polygon cylinder, and the number of sides S of the cavity is:

；

wherein N is the number of the phase windings, and T is the number of the winding coils connected in series in each phase winding.

Optionally, the radial distance L from any point on the radial cross section of the winding to the central axis of the cavity is:

；

wherein L1 is the shortest distance between the radial cross section of the winding and the central axis of the cavity;an angle of rotation around the circumferential direction of a point of the radial cross section of the winding having the shortest distance from the central axis of the cavity; l is->Is cyclically changed for one period.

Optionally, the permanent magnet is a cylinder, and a radial distance R between the winding and the permanent magnet is expressed as:

；

wherein L is the radial distance of any point on the radial cross section of the winding from the central axis of the cavity; l1 is the shortest distance between the radial section of the winding and the central axis of the cavity; m is the outer diameter of the permanent magnet;is the angle of rotation around the circumference of the point of the radial cross section of the winding that is the shortest distance from the central axis of the cavity.

Optionally, the windings are arranged in a central symmetry along a central axis of the cavity, and the winding coil of each phase winding is partially overlapped with the winding coils of the other phase windings.

Optionally, the winding includes three phase windings, the phase windings include one path of winding coil, and the cavity is a regular hexagonal cylinder.

Optionally, the single-turn coil is of a symmetrical structure, the single-turn coil comprises a first straight edge and a second straight edge which extend along the axial direction, the first straight edge and the second straight edge are arranged at a fixed distance, two ends corresponding to the first straight edge and the second straight edge respectively extend close to each other along two directions in sequence, a first bevel edge and a second bevel edge respectively extend in sequence, and end parts of the second bevel edges extending from two ends corresponding to the first straight edge and the second straight edge are connected or overlapped.

Optionally, the single turn coil occupies a first face, a second face and a third face that are continuous with the cavity inner wall; the first straight edge and the second straight edge are respectively positioned on the first face and the third face, the first inclined edge connected with the first straight edge is positioned on the first face, the first inclined edge connected with the second straight edge is positioned on the third face, and the second inclined edge is positioned on the second face.

Optionally, the first straight edges of the plurality of single turn coils of each of the positive electrode coil and the negative electrode coil are sequentially arranged by 120 ° in the circumferential direction.

Optionally, the three phase windings are a U-phase winding, a V-phase winding and a W-phase winding, the U-phase winding includes a U-phase positive coil and a U-phase negative coil, the V-phase winding includes a V-phase positive coil and a V-phase negative coil, the W-phase winding includes a W-phase positive coil and a W-phase negative coil, and corresponding first straight edges of the U-phase positive coil, the V-phase positive coil and the W-phase positive coil are circumferentially spaced by 120 °; the corresponding first straight edges of the U-phase negative electrode coil, the V-phase negative electrode coil and the W-phase negative electrode coil are circumferentially and sequentially spaced by 120 degrees.

Optionally, an included angle between the first oblique side and a radial section of the winding is a1, and an included angle between the second oblique side and the radial section of the winding is b1, wherein the angle a1 is less than or equal to the angle b1.

Optionally, the first straight edge and the second straight edge are circumferentially spaced 180 ° apart.

Optionally, the outer wall of the iron core is provided with a regular polygon column structure matched with the cavity.

Compared with the prior art, the technical scheme of the embodiment of the invention has the beneficial effects.

For example, the hollow cup motor provided by the invention is provided with the winding and the iron core of the regular polygon cylinder, so that the distance from the permanent magnet to the winding is changed from equidistant to sinusoidal, the air gap magnetic field is also changed more to sinusoidal, the higher order harmonic component of back electromotive force is reduced, the excessive electromagnetic loss and vibration caused by harmonic waves in the working process of the motor are reduced, and the working efficiency of the motor is improved.

For another example, the single turn coil is a symmetrical polygon occupying three sides of the cavity inner wall, having a straight edge and a first hypotenuse and a second hypotenuse connecting the straight edge to extend toward the cavity end; more magnetic fluxes can be collected by the single-turn coil, meanwhile, the first bevel edges of the coils can be overlapped in a crossing mode only when the surfaces of the first bevel edges are overlapped, so that the cross overlapping of the coils is reduced to the maximum extent, and counter electromotive force is reduced; and the motor performance is improved.

For another example, the winding reduces the consumption of copper by controlling the angle of the first bevel edge and the second bevel edge, for example, when the angle of the first bevel edge and the angle of the second bevel edge are equal, the length of the first bevel edge and the length of the second bevel edge are shortest, so that the resistance of the winding is reduced, and the loss is reduced; when the angle of the first hypotenuse is smaller than that of the second hypotenuse, the length of the first hypotenuse is shorter, the cross overlapping part is further reduced, counter electromotive force is reduced, and the motor performance is improved.

For example, the regular polygon iron core increases the area of the inner wall of the cavity relative to the cylindrical iron core with the same size, namely increases the contact area between the winding and the iron core, reduces the stress of the contact surface under the same torque, and prolongs the service life of the motor.

Drawings

Fig. 1 is a waveform diagram of back electromotive force of a conventional cylindrical cup motor.

Fig. 2 is a back emf harmonic fourier exploded view of a conventional cylindrical cup motor.

Fig. 3 is a schematic structural diagram of a hollow cup motor according to an embodiment of the present invention.

Fig. 4 is a top view of a winding in an embodiment of the invention.

Fig. 5 is a graph comparing the radial distance between the windings and the permanent magnets in the embodiment of the present invention with the radial distance between the windings and the permanent magnets in the conventional cylindrical coreless motor.

Fig. 6 is a waveform diagram of back electromotive force of the hollow cup motor according to an embodiment of the present invention.

Fig. 7 is a harmonic fourier exploded view of back emf of a hollow cup motor in an embodiment of the invention.

Fig. 8 is a three-dimensional view of a single turn coil in an embodiment of the invention.

Fig. 9 is a front view of a single turn coil in an embodiment of the invention.

Fig. 10 is a left side view of a single turn coil in an embodiment of the invention.

Fig. 11 is a top view of a single turn coil in an embodiment of the invention.

Fig. 12 is a layout of a portion of a single turn coil in a cavity in an embodiment of the invention.

Fig. 13 is another angular layout of a portion of a single turn coil in a cavity in an embodiment of the invention.

Fig. 14 is a schematic view of the angular adjustment of the first and second hypotenuses in the front view of a single turn coil in an embodiment of the invention.

Fig. 15 is a top view of a core in an embodiment of the invention.

Detailed Description

In order to make the objects, features and advantageous effects of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the following detailed description is merely illustrative of the invention, and not restrictive of the invention. Moreover, the use of the same, similar reference numbers in the figures may indicate the same, similar elements in different embodiments, and descriptions of the same, similar elements in different embodiments, as well as descriptions of prior art elements, features, effects, etc. may be omitted.

The regular polygon described in the specification and the claims comprises a regular polygon, and the straight sides of the corresponding regular polygon are replaced by arc sides, multiple arc sides or multiple fold line sides to form a polygon; wherein, the arc line side, the multi-section arc line side or the multi-section broken line side are axisymmetric structures.

Sinusoidal as used in the specification and claims refers to a curve that is approximately consistent with the law of sinusoidal variation.

Referring to fig. 3-15, an embodiment of the present invention provides a coreless motor.

Specifically, the hollow cup motor comprises a stator and a rotor, wherein the stator comprises an iron core 2 and a winding 3, the iron core 2 is provided with a through cavity 5, the winding 3 is attached to the inner wall of the cavity 5, the rotor comprises a permanent magnet 4 arranged in the center of the cavity 5, an air gap 1 is formed between the winding 3 and the permanent magnet 4, the cavity 5 is of a regular polygon cylinder structure, the permanent magnet 4 is of a regular cylinder structure, and the permanent magnet 4 is suitable for rotating along the central axis of the cavity 5; the winding 3 comprises at least three phase windings, each phase winding comprising at least one winding coil connected in series, each winding coil comprising a positive and a negative coil symmetrical with respect to the central axis of the cavity, i.e. arranged at a mechanical angle of 180 °, each positive and negative coil comprising a plurality of single turn coils 34, the single turn coils 34 having at least 10 sides.

In specific implementation, the cavity 5 is a regular polygon cylinder structure, the permanent magnet 4 is a cylinder structure, the radial distance between the winding 3 and the permanent magnet 4 varies in a sinusoidal manner around the circumference, and the calculation process is as follows: the cavity 5 is a regular polygon column, and the number S of sides of the cavity 5 is as follows:

；

where N is the number of phase windings and T is the number of windings in each phase winding connected in series.

In some embodiments, the winding 3 is cut along a face extending perpendicular to the central axis of the cavity 5, which is defined as the radial cross-section of the winding 3.

In fig. 4L 1 is the vertical distance from the central axis of the cavity 5 to the winding 3, i.e. the shortest distance between the radial cross section of the winding 3 and the central axis of the cavity 5, and L10 is the longest distance between the radial cross section of the winding 3 and the central axis of the cavity 5. The distance L between the winding 3 and the central axis of the cavity 5 is:

；

wherein, the liquid crystal display device comprises a liquid crystal display device,is the angle of rotation around the circumferential direction of the point of the radial section of the winding 3 that is the shortest distance from the central axis of the cavity 5; l is->Is cyclically changed for one period.

In particular implementation, the permanent magnets 4 are cylindrical, and the radial distance R between the windings 3 and the permanent magnets 4 is expressed as:

；

As shown in FIG. 5, the horizontal axis representsThe vertical axis indicates the distance between the winding 3 and the permanent magnet 4, the curve 01 indicates the distance variation waveform between the regular polygon winding 3 and the permanent magnet 4, and the straight line 02 indicates the distance variation waveform between the winding and the permanent magnet of the cylindrical coreless motor in the prior art. As can be seen from fig. 5, the radial distance R between the winding 3 and the permanent magnet 4 of the hollow cup motor in the embodiment of the present invention varies sinusoidally.

Fig. 6 is a waveform diagram of back electromotive force of the coreless motor according to the embodiment of the present invention, the horizontal axis represents time in ms, the vertical axis represents back electromotive force in V, and the waveform varies sinusoidally.

Fig. 7 is a fourier decomposition diagram of the back electromotive force of the cup motor according to the embodiment of the present invention, the horizontal axis represents frequency in kHz, and the vertical axis represents normalized induced voltage after fourier decomposition, and it is understood from fig. 7 that the higher order harmonic component is small.

In summary, compared with the existing cylindrical hollow cup motor, the distance between the winding and the permanent magnet is a fixed value, the radial distance R between the winding 3 and the permanent magnet 4 of the hollow cup motor in the embodiment of the invention is in sinusoidal change, the counter electromotive force is in sinusoidal change, the higher-order harmonic component is smaller, the problem of excessive electromagnetic loss is effectively avoided when the motor is loaded, meanwhile, the vibration of the motor is avoided, the electric quantity loss is reduced, and the working efficiency of the motor is improved.

Compared with a cylindrical hollow cup motor with a permanent magnet 4 with the same size, the hollow cup motor in the embodiment of the invention has the circumference of the radial section of the contact surface of the winding 3 of the hollow cup and the iron core 2 of 2 xS x tan (360 degrees/2S) x L1, and the circumference of the contact of the winding of the cylindrical structure with the radius L1 and the iron core of 2 xpi x L1, and the contact area of the winding 3 of the hollow cup and the iron core 2 is larger under the same torque effect, so that the stress of the winding 3 is reduced, the stability of the winding 3 is improved, and the service life of the winding 3 is prolonged.

In some embodiments, the cavity 5 is a regular polygon column structure, that is, a polygon formed by replacing straight sides of a corresponding regular polygon with arc sides, multiple sections of arc sides or multiple sections of broken line sides; wherein, the arc line side, the multi-section arc line side or the multi-section broken line side are axisymmetric structures; the radial distance R between the windings 3 and the permanent magnets 4 is changed in a sinusoidal manner.

In some embodiments, the permanent magnet 4 is a regular polygon cylinder, and the number of sides of the regular polygon may be consistent with or inconsistent with the number of sides of the cavity 5, so long as the distance between the winding 3 and the permanent magnet 4 changes in a sinusoidal manner.

In a specific implementation, the windings 3 are arranged in a central symmetry along the central axis of the cavity 5, and the winding coil of each phase winding is partially overlapped with the winding coils of the other phase windings.

In the specific implementation, the winding 3 includes three phase windings, which are a U-phase winding 31, a V-phase winding 32 and a W-phase winding 33, respectively, and the U-phase winding 31, the V-phase winding 32 and the W-phase winding 33 each include a winding coil, i.e., in the above formula, n=3 and t=1 are taken, and s=6 is taken, i.e., the cavity 5 is a regular hexagonal cylinder.

The U-phase winding 31 includes a U-phase positive electrode coil and a U-phase negative electrode coil that are symmetrically disposed with respect to the central axis of the cavity 5, the V-phase winding 32 includes a V-phase positive electrode coil and a V-phase negative electrode coil that are symmetrically disposed with respect to the central axis of the cavity 5, and the W-phase winding 33 includes a W-phase positive electrode coil and a W-phase negative electrode coil that are symmetrically disposed with respect to the central axis of the cavity 5. Each of the positive and negative coils includes a plurality of single turn coils 34.

Referring to fig. 8-11, in an embodiment, the single turn coil 34 is of a symmetrical structure, the single turn coil 34 has 10 sides, the single turn coil 34 includes a first straight edge 341 and a second straight edge 342 disposed along an axial direction, and the first straight edge 341 and the second straight edge 342 are disposed at a fixed distance from each other. The two ends of the first straight edge 341 and the second straight edge 342 corresponding to each other, that is, the two ends of the first straight edge 341 and the two ends of the second straight edge 342 facing the same end of the cavity 5, respectively, extend in two directions in order to approach each other, so as to form a first oblique edge and a second oblique edge, respectively, and the ends of the second oblique edge extending from the two corresponding ends of the first straight edge 341 and the second straight edge 342 are connected or overlapped. In particular, the cavity 5 has a first end 54 and a second end 55; the first straight edge 341 extends towards the first end 54 in two directions sequentially towards the first end 54 and the direction close to the second straight edge 342 to form a first inclined edge 343 at one end of the first straight edge and a second inclined edge 344 at one end of the first straight edge; the first straight edge 341 extends in two directions sequentially toward the other end of the second end 55, toward the second end 55 and toward the second straight edge 342, forming a first oblique edge 345 at the other end of the first straight edge and a second oblique edge 346 at the other end of the first straight edge; the second straight edge 342 extends in two directions sequentially towards one end of the first end 54, towards the first end 54 and towards the direction close to the first straight edge 341, and forms a first oblique edge 347 at one end of the second straight edge and a second oblique edge 348 at one end of the second straight edge; the second straight edge 342 extends in two directions sequentially toward the other end of the second end 55 and in a direction toward the second end 55 and close to the first straight edge 341, forming a first oblique edge 349 at the other end of the second straight edge and a second oblique edge 340 at the other end of the second straight edge; the second hypotenuse 344 at one end of the first straight edge is connected or coincident with the end of the second hypotenuse 348 at one end of the second straight edge, and the second hypotenuse 346 at the other end of the first straight edge is connected or coincident with the end of the second hypotenuse 340 at the other end of the second straight edge, forming a decagonal single turn coil having 10 sides (i.e., the first straight edge 341, the first hypotenuse 343 at one end of the first straight edge, the second hypotenuse 344 at one end of the first straight edge, the second hypotenuse 348 at one end of the second straight edge, the first hypotenuse 347 at one end of the second straight edge, the first hypotenuse 349 at the other end of the second straight edge, the second hypotenuse 340 at the other end of the second straight edge, the second hypotenuse 346 at the other end of the first straight edge, and the first hypotenuse 345 at the other end of the first straight edge).

Referring to fig. 11-13, the first straight edge 341 and the second straight edge 342 are circumferentially spaced 180 ° apart. In the specific implementation, taking the superposition of the first straight edge 341 and the side edge of the cavity 5 as an example, the single-turn coil 34 occupies the first surface 51, the second surface 52 and the third surface 53 which are continuous on the inner wall of the cavity 5, the coverage area of the single-turn coil 34 is larger, and enough magnetic flux can be collected; the first inclined edge 343 at one end of the first straight edge and the first inclined edge 345 at the other end of the first straight edge are located on the third face 53; the first oblique side 347 at one end of the second straight side and the first oblique side 349 at the other end of the second straight side are located on the first face 51; the second beveled edge 344 at one end of the first straight edge, the second beveled edge 348 at one end of the second straight edge, the second beveled edge 346 at the other end of the first straight edge, and the second beveled edge 340 at the other end of the second straight edge are located on the second face 52. Corresponding first straight edges of the U-phase positive electrode coil, the V-phase positive electrode coil and the W-phase positive electrode coil, namely the first straight edges of the first single-turn coils of the U-phase positive electrode coil, the V-phase positive electrode coil and the W-phase positive electrode coil which are positioned on the same side are circumferentially spaced by 120 degrees; corresponding first straight edges of the U-phase negative electrode coil, the V-phase negative electrode coil and the W-phase negative electrode coil, namely the first straight edges of the first single-turn coils of the U-phase negative electrode coil, the V-phase negative electrode coil and the W-phase negative electrode coil which are positioned on the same side, are sequentially spaced by 120 degrees along the circumferential direction.

Adjacent positive electrode coils or adjacent negative electrode coils overlap each other only on one surface of the cavity 5. Taking the positive electrode coil as an example, that is, a first oblique side 347 of a certain single-turn coil 34 of a positive electrode coil at one end of the second straight side of the first face 51 and a first oblique side 349 of the other end of the second straight side are overlapped with a certain single-turn coil 34 of an adjacent positive electrode coil, the first oblique side 343 of a certain single-turn coil 34 of a positive electrode coil at one end of the first straight side of the third face 53 and the first oblique side 345 of the other end of the first straight side are overlapped with a certain single-turn coil 34 of an adjacent other positive electrode coil. Thereby maximally reducing the cross overlap between coils and reducing the back electromotive force; and the motor performance is improved.

Referring to fig. 14, a schematic view of the angle adjustment of the first oblique side and the second oblique side in the front view of the single turn coil 34 according to the embodiment of the present invention is shown. The total length of the single-turn coil 34 along the axial direction is X, the distance between the first straight edge 341 and the second straight edge 342 is tau, the length of the first straight edge 341 and the second straight edge 342 along the axial direction is Y, and the total length Z of the bevel edge of the single side along the axial direction is:

；

the length a2 of the first hypotenuse 343 at one end of the first straight edge, the first hypotenuse 345 at the other end of the first straight edge, the first hypotenuse 347 at one end of the second straight edge, and the first hypotenuse 349 at the other end of the second straight edge is:

；

wherein a1 is an included angle between the first inclined side 343 at one end of the first straight side and the radial section of the cavity 5;

the length b2 of the second oblique side 344 at one end of the first straight side, the second oblique side 348 at one end of the second straight side, the second oblique side 346 at the other end of the first straight side, and the second oblique side 340 at the other end of the second straight side is:

。

wherein b1 is an included angle between the second inclined edge 344 at one end of the first straight edge and the radial section of the cavity 5;

the total length C of the first oblique side and the second oblique side is

；

If and only if +.a1= +.b1, cos (a 1) = cos (b 1), the hypotenuse total length is shortest, the winding 3 utilization is the largest and the resistance is the smallest.

When +.a1 < +.b1, the length a2 of first hypotenuse reduces, and the length b2 of second hypotenuse increases simultaneously, because only can appear the cross overlap phenomenon between the first hypotenuse between the coil, the length a2 of first hypotenuse reduces for overlap area further reduces, reduces back electromotive force, promotes motor performance.

In fig. 14, the length a2 of the first oblique side is a projection length, which is proportional to the actual length of the first oblique side.

To facilitate understanding of the arrangement of each of the positive and negative coils of the winding, the positive and negative coils are represented in fig. 3-4 by the arrangement of only the first straight edges 341 of the plurality of single-turn coils 34 of the positive and negative coils so as to embody 120 ° of the first straight edges 341 of the plurality of single-turn coils 34 of the positive and negative coils arranged sequentially in the circumferential direction.

In specific implementation, as shown in fig. 4, the first straight edges 341 of the plurality of single-turn coils 34 of the U-phase positive electrode coil are sequentially arranged by 120 ° along the circumferential direction, so that the first coverage areas 311 are uniformly distributed on two adjacent inner walls of the cavity 5; the first straight edges 341 of the single-turn coils 34 of the V-phase positive electrode coil are sequentially distributed for 120 degrees along the circumferential direction, so that the second coverage areas 321 are uniformly distributed on two adjacent inner walls of the cavity 5; the first straight edges 341 of the plurality of single-turn coils 34 of the W-phase positive electrode coil are sequentially arranged by 120 ° along the circumferential direction, so that the third coverage areas 331 are uniformly distributed on two adjacent inner walls of the cavity 5. The first coverage area 311, the second coverage area 321, and the third coverage area 331 are sequentially terminated in the circumferential direction. The first straight edges 341 of the plurality of single-turn coils 34 of the U-phase negative electrode coil are sequentially distributed for 120 degrees along the circumferential direction, so that a fourth coverage area 312 is formed and uniformly distributed on two adjacent inner walls of the cavity 5; the first straight edges 341 of the plurality of single-turn coils 34 of the V-phase negative electrode coil are sequentially arranged for 120 ° along the circumferential direction, so that a fifth coverage area 322 is formed and uniformly distributed on two adjacent inner walls of the cavity 5; the first straight edges 341 of the plurality of single-turn coils 34 of the W-phase negative electrode coil are sequentially arranged by 120 ° along the circumferential direction, so that the sixth coverage area 332 is formed and uniformly distributed on two adjacent inner walls of the cavity 5. The fourth coverage area 312, the fifth coverage area 322, and the sixth coverage area 332 are circumferentially sequentially terminated.

In particular, the winding 3 is a single-layer overlapping winding. In some embodiments, concentric windings, double stacked windings may be employed.

Referring to fig. 3, 4 and 15, the maximum diameter phi E of the outer wall of the winding 3 is equal to the maximum diameter phi F of the inner wall of the iron core 2, and the maximum outer diameter phi d=phi f+ (0.6 mm-2 mm) of the outer wall of the iron core 2, namely, the radial width of the unilateral iron core 2 is 0.3 mm-1 mm, and the outer wall of the iron core 2 is set to be a regular polygon cylinder structure matched with the cavity 5; the polygonal structure has a plurality of faces, compared to the cylindrical outer wall, which can spatially limit the torque reaction force of the rotor when in operation.

The hollow cup motor in the above embodiment can be applied to an auxiliary blood circulation device, which is a pumping device for guiding into the aorta (or other vascular parts) of a heart failure patient and providing circulation support for the heart of the heart failure patient, and can assist the heart to increase the perfusion pressure of the aorta, thereby achieving the purpose of treating the heart failure. The auxiliary blood circulation device pumps blood by means of the corresponding hollow cup motor in any of the previous embodiments, and has the beneficial effects of the corresponding hollow cup motor embodiments, which are not described in detail herein.

Finally, it should be noted that the axial direction, the radial direction and the circumferential direction of the embodiment of the present invention represent the axial direction, the radial direction and the circumferential direction of the cavity 5, respectively.

Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the disclosure, even where only a single embodiment is described with respect to a particular feature. The characteristic examples provided in the present disclosure are intended to be illustrative, not limiting, unless stated differently. In practice, the features of one or more of the dependent claims may be combined with the features of the independent claims where technically possible, according to the actual needs, and the features from the respective independent claims may be combined in any appropriate way, not merely by the specific combinations enumerated in the claims.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims

1. The hollow cup motor comprises a stator and a rotor, wherein the stator comprises an iron core and a winding, the iron core is provided with a through cavity, the winding is attached to the inner wall of the cavity and is arranged, the rotor comprises a permanent magnet arranged in the center of the cavity, and an air gap is formed between the winding and the permanent magnet; the winding comprises at least three phase windings, each phase winding comprises at least one winding coil connected in series, each winding coil comprises a positive electrode coil and a negative electrode coil which are symmetrically arranged relative to the central axis of the cavity, each positive electrode coil and each negative electrode coil respectively comprise a plurality of single-turn coils, and each single-turn coil is provided with at least 10 side edges;

the number S of sides of the cavity is as follows:

；

wherein N is the number of the phase windings, and T is the number of the winding coils connected in series in each phase winding;

the radial distance L from any point on the radial cross section of the winding to the central axis of the cavity is:

；

wherein L1 is the radial cross section of the winding and the cavityShortest distance of the central axis;an angle of rotation around the circumferential direction of a point of the radial cross section of the winding having the shortest distance from the central axis of the cavity; l is->Is a periodic cyclic variation;

the permanent magnet is a cylinder, and the radial distance R between the winding and the permanent magnet is expressed as:

；

wherein L is the radial distance of any point on the radial cross section of the winding from the central axis of the cavity; m is the outer diameter of the permanent magnet;

the winding comprises three phase windings, the phase windings comprise one path of winding coils, and the cavity is a regular hexagon cylinder;

the single-turn coil is of a symmetrical structure and comprises a first straight edge and a second straight edge which extend along the axial direction, the first straight edge and the second straight edge are arranged at fixed distances, two ends corresponding to the first straight edge and the second straight edge respectively extend close to each other along two directions in sequence and respectively extend to form a first bevel edge and a second bevel edge in sequence, and the end parts of the second bevel edge extending from the two ends corresponding to the first straight edge and the second straight edge are connected or overlapped;

the single-turn coil occupies a first face, a second face and a third face which are continuous on the inner wall of the cavity; the first straight edge and the second straight edge are respectively positioned on the first surface and the third surface, the first inclined edge connected with the first straight edge is positioned on the first surface, the first inclined edge connected with the second straight edge is positioned on the third surface, and the second inclined edge is positioned on the second surface;

the first straight edges of the plurality of single-turn coils of each positive electrode coil and each negative electrode coil are sequentially circumferentially distributed for 120 degrees;

the three phase windings are a U-phase winding, a V-phase winding and a W-phase winding respectively, wherein the U-phase winding comprises a U-phase positive coil and a U-phase negative coil, the V-phase winding comprises a V-phase positive coil and a V-phase negative coil, the W-phase winding comprises a W-phase positive coil and a W-phase negative coil, and the corresponding first straight edges of the U-phase positive coil, the V-phase positive coil and the W-phase positive coil are circumferentially spaced by 120 degrees; the corresponding first straight edges of the U-phase negative electrode coil, the V-phase negative electrode coil and the W-phase negative electrode coil are circumferentially and sequentially spaced by 120 degrees.

2. The coreless motor of claim 1, wherein said windings are disposed centrally symmetrically about a central axis of said cavity, said winding coil of each said phase winding being disposed in partial overlap with said winding coils of the remaining said phase windings.

3. The coreless motor of claim 1, wherein the first beveled edge forms an angle a1 with the radial cross-section of the winding, and the second beveled edge forms an angle b1 with the radial cross-section of the winding, the angle a1 being less than or equal to the angle b1.

4. The coreless motor of claim 1, wherein the first straight edge and the second straight edge are circumferentially spaced 180 ° apart.

5. The coreless motor of claim 1, wherein the outer wall of the core is configured as a regular polygonal cylinder structure matching the cavity.