CN117439294A - Stator core, stator assembly, motor and servo system - Google Patents

Abstract

The invention provides a stator core, a stator assembly, a motor and a servo system. The stator core includes a plurality of core blocks. The plurality of iron core blocks are arranged along the circumferential direction, and each iron core block comprises a yoke part, a tooth part and a tooth shoe; the first end of the tooth part is connected with the yoke part, and the second end of the tooth part extends to the axis of the stator core; the tooth shoe is arranged at the second end of the tooth part; a winding groove is formed between the tooth parts of the adjacent iron core blocks in the plurality of iron core blocks, and a notch is formed between the tooth shoes of the adjacent iron core blocks in the plurality of iron core blocks; the tooth shoe is provided with a groove which is recessed towards the yoke part on one side of the notch. According to the stator core provided by the invention, the grooves which are sunken towards the yoke part are formed in one side of the tooth shoes, so that the distribution of air gap flux guide space can be changed by the grooves, the specific air gap flux density harmonic content is weakened, the cogging torque of the motor is further reduced, and the improvement of the cogging torque of the motor is realized.

Description

Stator core, stator assembly, motor and servo system

Technical Field

The invention relates to the technical field of motors, in particular to a stator core, a stator assembly, a motor and a servo system.

Background

At present, in the related art, under the condition of different electricity of a servo motor, the interaction between a permanent magnet and a stator core can generate cogging torque, and when the cogging torque is large, the accuracy of the control of the servo motor can be affected, so that the performance of the motor is affected.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, a first aspect of the present invention proposes a stator core.

A second aspect of the present invention proposes a stator assembly.

A third aspect of the present invention proposes an electric machine.

A fourth aspect of the invention proposes a servo system.

In view of this, a first aspect of the present invention provides a stator core including a plurality of core blocks. The plurality of iron core blocks are arranged along the circumferential direction, and each iron core block comprises a yoke part, a tooth part and a tooth shoe; the first end of the tooth part is connected with the yoke part, and the second end of the tooth part extends to the axis of the stator core; the tooth shoe is arranged at the second end of the tooth part; a winding groove is formed between the tooth parts of the adjacent iron core blocks in the plurality of iron core blocks, and a notch is formed between the tooth shoes of the adjacent iron core blocks in the plurality of iron core blocks; the tooth shoe is provided with a groove which is recessed towards the yoke part on one side of the notch.

The stator core provided by the invention comprises a plurality of core blocks, wherein each core block comprises a yoke part, a tooth part and a tooth shoe, a winding groove is formed between the tooth parts of the adjacent core blocks in the plurality of core blocks, a notch of the winding groove is formed between the tooth shoes of the adjacent core blocks in the plurality of core blocks, and a stator winding can be wound on the tooth part and is embedded in the winding groove, so that the driving of a rotor is realized after the stator winding is electrified.

The grooves which are sunken towards the yoke part are formed in one side of the tooth shoes, so that the distribution of air gap flux guide space can be changed, the specific air gap flux density harmonic content is weakened, the cogging torque of the motor is further reduced, and the cogging torque of the motor is improved.

Through being provided with the recessed recess towards yoke portion in the tooth boots side that is located the notch, when reducing motor cogging torque, can reduce the torque ripple of motor for the motor can last to export more stable torque.

The tooth shoe is provided with the groove, so that the cogging torque of the motor can be improved, the torque fluctuation can be reduced, the accuracy of motor control can be improved, and the performance of the motor can be further improved.

Because stator core includes a plurality of iron core blocks to every iron core block includes yoke portion and tooth portion, when carrying out the wire winding, can wind the stator winding on every iron core block earlier, and stator winding is accomplished the back and is spliced a plurality of iron core blocks again, makes stator winding's coiling more convenient, and then simplifies stator winding's coiling technology, promotes stator winding's coiling efficiency.

And in the process of winding the stator winding, the yoke part can support the tooth part, so that each winding groove is provided with a notch after a plurality of iron core blocks are spliced, the magnetic flux leakage of the stator iron core at the tooth top is reduced, and the performance of the motor is further improved.

Specifically, the yoke and tooth portions of the core block form a T-shaped structure.

The number of the winding grooves is the same as the number of the iron core blocks.

In addition, the stator core in the technical scheme provided by the invention can also have the following additional technical characteristics:

in one embodiment of the invention, the edge of the tooth shoe at the recess extends in a curved and/or straight line.

In the technical scheme, the edge of the tooth shoe, which is positioned at the groove, extends in a curve or a straight line, so that the groove can modulate the magnetic conductance of the magnetic circuit more effectively, and the modulating effect of the groove on the magnetic conductance of the magnetic circuit is further improved.

In one technical scheme of the invention, the number of the tooth shoes is two, the two tooth shoes are respectively arranged at two sides of the tooth part, and the grooves on the two tooth shoes are symmetrical relative to the tooth part.

In this technical scheme, be provided with two tooth boots on every tooth portion, all be provided with at least one recess on every tooth boot in two tooth boots, and the recess on two tooth boots is symmetrical for tooth portion, promotes the homogeneity that the recess distributes in stator core circumference, and then makes the recess reduce the tooth's socket torque of motor effectively.

In one embodiment of the present invention, the grooves on both sides of the winding groove in the circumferential direction are symmetrical with respect to the winding groove.

In the technical scheme, a winding groove is formed between the tooth parts of two adjacent iron core blocks, one tooth shoe is arranged on one side of the winding groove, which is positioned on the tooth shoes on two sides of the winding groove, and the grooves on the tooth shoes are symmetrical relative to the winding groove, so that the uniformity of the grooves distributed in the circumferential direction of the stator iron core is further improved.

In one embodiment of the invention, the width of the groove in the circumferential direction is greater than the depth in the radial direction.

In this technical scheme, the width of recess in stator core's circumference is greater than the radial ascending degree of depth of recess at stator core for the longer one side of recess length is arranged along stator core's circumference, and then makes the recess modulate the magnetic conductance of magnetic circuit more effectively better, further promotes the modulation effect of first recess to the magnetic conductance of magnetic circuit.

In one aspect of the present invention, a ratio of a width of the groove in the circumferential direction to a depth of the groove in the radial direction is 3 or more and 5 or less.

In the technical scheme, the ratio of the width of the groove in the circumferential direction of the stator core to the depth of the groove in the diameter of the stator core is 3-5, the ratio of the width of the groove in the circumferential direction of the stator core to the depth of the groove in the diameter of the stator core is in the range, the adjusting effect of the groove on the cogging torque is further improved, and the cogging torque and torque fluctuation are further reduced.

Further, the ratio of the width of the groove in the circumferential direction of the stator core to the depth of the groove in the diameter of the stator core may be 4.

The ratio of the width of the groove in the circumferential direction of the stator core to the depth of the groove in the diameter of the stator core may also be 3 or 5.

In one aspect of the invention, the depth of the groove in the radial direction is less than the height of the slot in the radial direction.

In the technical scheme, the depth of the groove in the radial direction is smaller than the height of the notch in the radial direction, so that the size of the second tooth boot on one side of the notch is adjusted, and the magnetic flux leakage of the second tooth is effectively reduced, and meanwhile, the magnetic flux guide of the magnetic circuit is modulated.

In one aspect of the present invention, a ratio of a width of the notch in the circumferential direction to a height of the notch in the radial direction is 5 or more and 7 or less.

In this technical solution, the ratio of the width of the slot in the circumferential direction of the stator core to the height of the slot in the radial direction of the stator core is 5 to 7. The ratio of the width of the slot in the circumferential direction of the stator core to the height of the slot in the radial direction of the stator core is in this range, and the optimization of the cogging torque is further achieved.

And set the ratio of the width of notch in stator core's circumference to the height of notch in stator core's radial direction to 5 to 7, can promote the overload capacity of motor, and then reduce the torque ripple of motor, promote the stability of motor operation in-process.

Further, the ratio of the width of the slot in the circumferential direction of the stator core to the height of the slot in the radial direction of the stator core may be 6.

The ratio of the width of the slot in the circumferential direction of the stator core to the height of the slot in the radial direction of the stator core may also be 5 or 7.

In one technical scheme of the invention, a clamping groove is formed in one of the adjacent iron core blocks, and a buckle is arranged on the other iron core block and is clamped in the clamping groove.

In this technical scheme, adjacent iron core piece passes through draw-in groove and buckle to be connected for can stablely connect between a plurality of iron core pieces, and then avoid a plurality of iron core pieces to change the position because of the vibration in the motor working process, promote the stability of a plurality of iron core pieces in motor work. And connect adjacent iron core piece through draw-in groove and buckle, simplified the assembly process of iron core piece, promoted the assembly efficiency of iron core piece.

Further, the clamping groove is a dovetail groove, and the shape of the buckle is matched with the clamping groove.

A second aspect of the present invention provides a stator assembly comprising a stator core according to any one of the above-mentioned aspects, whereby the stator assembly has all the advantages of the stator core according to any one of the above-mentioned aspects.

In addition, the stator assembly in the technical scheme provided by the invention can also have the following additional technical characteristics:

in one aspect of the present invention, the stator assembly further includes a stator winding, the stator winding is wound around the tooth portion, the stator winding includes a plurality of first coils and a plurality of second coils, the plurality of second coils are connected by corner joints, and the plurality of first coils are connected to the plurality of second coils in a star shape.

In the technical scheme, a plurality of second coil angles are connected, and a plurality of first coils are connected with a plurality of second coils in a star shape, so that a plurality of first coils and a plurality of second coils form star-angle mixed wiring, the winding coefficient can be improved, and meanwhile, low-order magnetic potential harmonic waves are reduced, and further, the power density of the motor is improved, and torque fluctuation is improved.

Specifically, the sum of the numbers of the plurality of first coils and the plurality of second coils is the same as the number of core blocks.

Under the condition that the stator assembly is applied to the servo motor, the stator core comprises 12 iron core blocks, each iron core block comprises a tooth part, a plurality of first coils or a plurality of second coils are wound on the tooth part, the first coils and the second coils are connected in a star mode or in an angle mode, and the winding coefficient of the servo motor is 0.933. The first plurality of coils and the second plurality of coils employ a star-delta hybrid wiring winding factor of 0.966. And then through adopting the mode of a plurality of first coils and a plurality of second coils mixed wiring, can promote the winding coefficient of motor effectively.

Specifically, the plurality of first coils includes six first coils. The plurality of second coil corners includes six second coils.

The plurality of second coil corners are connected, and the specific wiring mode that the plurality of first coils are connected to the plurality of second coils in a star shape can be the following wiring mode.

The plurality of second coils are divided into three groups of coils, namely a first group of coils, a second group of coils and a third group of coils, wherein the first group of coils, the second group of coils and the third group of coils respectively comprise two second coils, the two second coils of the same group are connected, and then the first group of coils, the second group of coils and the third group of coils are sequentially connected to form a triangular wiring mode.

The plurality of first coils are also divided into three groups of coils, namely a fourth group of coils, a fifth group of coils and a sixth group of coils, wherein each group of coils in the fourth group of coils, the fifth group of coils and the sixth group of coils comprises two first coils, and the two first coils are connected.

The intersection point of the first group of coils and the second group of coils is connected with the first end of the fourth group of coils, the intersection point of the second group of coils and the third group of coils is connected with the first end of the fifth group of coils, and the intersection point of the first group of coils and the third group of coils is connected with the first end of the sixth group of coils.

The second ends of the fourth group of coils, the fifth group of coils and the sixth group of coils are leading-out ends, and can be connected with a driver of a motor, so that the motor is controlled.

In one embodiment of the present invention, a ratio of a number of turns of each of the plurality of second coils to a number of turns of each of the plurality of first coils is 1.5 or more and 2 or less.

In the technical scheme, the ratio of the number of turns of each second coil to the number of turns of each first coil is 1.5-2, and the ratio of the number of turns of the second coil to the number of turns of the first coil is in the range, so that the magnetomotive force balance can be ensured, and the slot space can be more fully utilized.

Specifically, the ratio of the number of turns of each second coil to the number of turns of each first coil is 1.732.

Specifically, the ratio of the number of turns of each second coil to the number of turns of each first coil is 1.5.

Specifically, the ratio of the number of turns of each second coil to the number of turns of each first coil is 2.

In one embodiment of the present invention, a ratio of a wire cross-sectional area of each of the plurality of second coils to a wire cross-sectional area of each of the plurality of first coils is 0.5 or more and 0.9 or less.

In the technical scheme, the ratio of the wire sectional area of each second coil to the wire sectional area of each first coil is 0.5-0.9, and the ratio of the wire sectional area of the second coil to the wire sectional area of the first coil is in the range, so that magnetomotive force balance can be further improved, and simultaneously, the slot space is more fully utilized.

Specifically, the ratio of the wire cross-sectional area of each second coil to the wire cross-sectional area of each first coil was 0.76.

Specifically, the ratio of the wire cross-sectional area of each second coil to the wire cross-sectional area of each first coil was 0.5.

Specifically, the ratio of the wire cross-sectional area of each second coil to the wire cross-sectional area of each first coil was 0.9.

Specifically, the first coil and the second coil are enameled wires, the enameled wires are coated with a layer of insulating paint outside a metal wire, and the wire cross section area of the first coil and the wire cross section area of the second coil are both diameters of the metal wire. The metal wire may be a copper wire or an aluminum wire.

A third aspect of the invention provides an electrical machine comprising a stator assembly as claimed in any one of the preceding claims. The motor thus has all the advantages of the stator assembly of any of the above-mentioned solutions.

The motor also comprises a rotor assembly coaxially arranged on the inner side of the stator assembly, and an air gap is arranged between the rotor assembly and the stator assembly.

In one technical scheme of the invention, the motor is a servo motor.

A fourth aspect of the present invention provides a servo system comprising a motor according to any of the above-mentioned aspects, whereby the master system has all the advantages of a motor according to any of the above-mentioned aspects.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 shows a schematic structural view of a stator core according to an embodiment of the present invention;

fig. 2 shows a schematic structural view of a core block according to an embodiment of the present invention;

FIG. 3 is a partial schematic view of the stator core at A shown in FIG. 1 according to one embodiment of the present invention;

FIG. 4 shows a schematic diagram of the wiring of a stator winding according to one embodiment of the invention;

FIG. 5 is a schematic diagram of comparing cogging torque of a motor provided in the present application with that of a motor in the related art;

fig. 6 is a schematic diagram comparing output torques of the motor provided in the present application and the motor in the related art.

Wherein, the correspondence between the reference numerals and the component names in fig. 1 to 4 is:

100 core blocks, 110 yokes, 120 teeth, 130 teeth shoes, 140 winding slots, 150 slots, 160 slots, 200 stator windings, 210 first coils, 212 fourth coils, 214 fifth coils, 216 sixth coils, 220 second coils, 222 first coils, 224 second coils, 226 third coils.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

A stator core, a stator assembly, a motor, and a servo system according to some embodiments of the present invention are described below with reference to fig. 1-6.

In one embodiment of the present invention, as shown in fig. 1 and 2, a stator core is provided, including a plurality of core blocks 100. A plurality of core blocks 100 are arranged in a circumferential direction, each core block 100 of the plurality of core blocks 100 including a yoke portion 110, a tooth portion 120, and a tooth shoe 130; a first end of the tooth 120 is connected to the yoke 110, and a second end of the tooth 120 extends toward the axis of the stator core; the tooth shoe 130 is arranged at the second end of the tooth part 120; a winding groove 140 is formed between the teeth 120 of adjacent ones of the plurality of core blocks 100, and a notch 150 is formed between the teeth shoes 130 of adjacent ones of the plurality of core blocks 100; the tooth shoe 130 is provided with a groove 160 recessed toward the yoke 110 on one side of the slot 150.

In this embodiment, the stator core includes a plurality of core blocks 100, the core blocks 100 include a yoke 110, teeth 120 and teeth shoes 130, a winding slot 140 is formed between the teeth 120 of adjacent core blocks 100 in the plurality of core blocks 100, a slot 150 of the winding slot 140 is formed between the teeth shoes 130 of adjacent core blocks 100 in the plurality of core blocks 100, a stator winding can be wound on the teeth 120 and embedded in the winding slot 140, and thus driving of the rotor is achieved after the stator winding is energized.

By providing the tooth shoe 130 with the recess 160 recessed toward the yoke 110 on the side of the slot 150, the recess 160 can change the air gap flux guide space distribution, weaken specific air gap flux density harmonic content, thereby reducing the cogging torque of the motor and realizing improvement of the cogging torque of the motor.

By providing the groove 160 recessed toward the yoke 110 on the side of the tooth shoe 130 located at the notch 150, torque ripple of the motor can be reduced while reducing cogging torque of the motor, so that the motor can continuously output more stable torque.

Since the cogging torque of the motor can be improved and the torque ripple can be reduced by providing the grooves 160 in the tooth shoes 130, the accuracy of motor control is improved, and thus the performance of the motor is improved.

Because the stator core includes a plurality of core blocks 100, and each core block 100 includes a yoke portion 110 and a tooth portion 120, when winding is performed, a stator winding can be wound on each core block 100 first, and after the stator winding is wound, the plurality of core blocks 100 are spliced, so that the winding of the stator winding is more convenient, the winding process of the stator winding is simplified, and the winding efficiency of the stator winding is improved.

And in the process of winding the stator winding, the yoke part 110 can support the tooth part 120, so that each winding groove 140 is provided with a notch 150 after the iron core blocks 100 are spliced, the magnetic leakage of the stator iron core at the tooth top is reduced, and the performance of the motor is further improved.

Specifically, the yoke portion 110 and the tooth portion 120 of the core block 100 form a T-shaped structure.

The number of winding slots 140 is the same as the number of core blocks 100.

The present embodiment provides a stator core, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1 and 2, the edge of the tooth shoe 130 at the recess 160 extends in a curved and/or straight line.

In this embodiment, the edge of the tooth shoe 130 at the groove 160 extends in a curve or a straight line, so that the groove 160 can modulate the flux guide of the magnetic circuit more effectively, and the modulation effect of the groove 160 on the flux guide of the magnetic circuit is further improved.

The present embodiment provides a stator core, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1 and 2, the number of the teeth shoes 130 is two, the two teeth shoes 130 are respectively disposed at two sides of the teeth 120, and the grooves 160 on the two teeth shoes 130 are symmetrical with respect to the teeth 120.

In this embodiment, two tooth shoes 130 are disposed on each tooth 120, at least one groove 160 is disposed on each tooth 130 of the two tooth shoes 130, and the grooves 160 on the two tooth shoes 130 are symmetrical with respect to the tooth 120, so that the uniformity of the distribution of the grooves 160 in the circumferential direction of the stator core is improved, and the grooves 160 can effectively reduce the cogging torque of the motor.

The present embodiment provides a stator core, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1 and 2, the grooves 160 of the winding groove 140 at both sides in the circumferential direction are symmetrical with respect to the winding groove 140.

In this embodiment, a winding slot 140 is formed between the teeth 120 of two adjacent core blocks 100, one tooth shoe 130 is disposed on each side of the teeth 120 of the two adjacent core blocks 100 located in the winding slot 140, and the grooves 160 on the tooth shoes 130 on both sides of the winding slot 140 are symmetrical with respect to the winding slot 140, so as to further improve the uniformity of the distribution of the grooves 160 in the circumferential direction of the stator core.

The present embodiment provides a stator core, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1 and 2, the width d of the groove 160 in the circumferential direction is greater than the depth c in the radial direction.

In this embodiment, the width d of the groove 160 in the circumferential direction of the stator core is larger than the depth c of the groove 160 in the radial direction of the stator core, so that the longer side of the groove 160 is arranged along the circumferential direction of the stator core, thereby enabling the groove 160 to modulate the flux guide of the magnetic circuit more effectively, and further improving the modulating effect of the first groove 160 on the flux guide of the magnetic circuit.

The present embodiment provides a stator core, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 3, the ratio of the width d of the groove 160 in the circumferential direction to the depth c of the groove 160 in the radial direction is 3 or more and 5 or less.

In this embodiment, the ratio of the width d of the groove 160 in the circumferential direction of the stator core to the depth c of the groove 160 in the radial direction of the stator core is 3 to 5, and the ratio of the width d of the groove 160 in the circumferential direction of the stator core to the depth c of the groove 160 in the radial direction of the stator core is within this range, so that the effect of adjusting the cogging torque by the groove 160 is further improved, and the cogging torque and the torque ripple are further reduced.

Further, the ratio of the width d of the groove 160 in the circumferential direction of the stator core to the depth c of the groove 160 in the diameter of the stator core may be 4.

The ratio of the width d of the groove 160 in the circumferential direction of the stator core to the depth c of the groove 160 in the radial direction of the stator core may also be 3 or 5.

The present embodiment provides a stator core, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 3, the depth c of the groove 160 in the radial direction is smaller than the height a of the notch 150 in the radial direction.

In this embodiment, the depth c of the groove 160 in the radial direction is smaller than the height a of the notch 150 in the radial direction, so that the dimension of the second tooth shoe on one side of the notch 150 is adjusted, and the flux leakage at the second tooth is effectively reduced, and the modulation of the flux guide of the magnetic circuit is realized.

The present embodiment provides a stator core, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 3, the ratio of the width b of the notch 150 in the circumferential direction to the height a of the notch 150 in the radial direction is 5 or more and 7 or less.

In this embodiment, the ratio of the width b of the slot 150 in the circumferential direction of the stator core to the height a of the slot 150 in the radial direction of the stator core is 5 to 7. The ratio of the width b of the slot 150 in the circumferential direction of the stator core to the height a of the slot 150 in the radial direction of the stator core is in this range, and the optimization of the cogging torque is further achieved.

And the ratio of the width b of the notch 150 in the circumferential direction of the stator core to the height a of the notch 150 in the radial direction of the stator core is set to be 5 to 7, so that the overload capacity of the motor can be improved, the torque fluctuation of the motor is reduced, and the stability of the motor in the running process is improved.

Further, the ratio of the width b of the slot 150 in the circumferential direction of the stator core to the height a of the slot 150 in the radial direction of the stator core may be 6.

The ratio of the width b of the slot 150 in the circumferential direction of the stator core to the height a of the slot 150 in the radial direction of the stator core may also be 5 or 7.

Further, the width of the slot 150 in the circumferential direction b is 1.5 mm to 2.5 mm, and the width b of the slot 150 can increase the output torque of the motor in this range, thereby further increasing the overload capacity of the motor.

The height a of the notch 150 in the radial direction is 0.3 mm to 0.5 mm, and the height a of the notch 150 is within the range, so that the output torque of the motor can be further improved, and the overload capacity of the motor can be further improved.

The present embodiment provides a stator core, which further includes the following technical features in addition to the technical features of the above embodiments.

As shown in fig. 1 and 2, a clamping groove is formed in one core block 100 of the adjacent core blocks 100, and a buckle is formed in the other core block 100 and is clamped in the clamping groove.

In this embodiment, the adjacent core blocks 100 are connected through the clamping grooves and the buckles, so that the plurality of core blocks 100 can be stably connected, and further the position of the plurality of core blocks 100 is prevented from being changed due to vibration in the working process of the motor, and the stability of the plurality of core blocks 100 in the working process of the motor is improved. And connect adjacent iron core block 100 through draw-in groove and buckle, simplified the assembly process of iron core block 100, promoted the assembly efficiency of iron core block 100.

Further, the clamping groove is a dovetail groove, and the shape of the buckle is matched with the clamping groove.

In one embodiment of the present invention, a stator assembly 200 is provided that includes a stator core as in any of the embodiments described above, and therefore the stator assembly 200 provides all of the benefits of the stator core of any of the embodiments described above.

The present embodiment provides a stator assembly 200, which further includes the following technical features in addition to the technical features of the above-described embodiments.

As shown in fig. 4, the stator assembly 200 further includes a stator winding wound around the tooth 120, the stator winding including a plurality of first coils 210 and a plurality of second coils 220, the plurality of second coils 220 being connected at corners, the plurality of first coils 210 being star-connected to the plurality of second coils 220.

In this embodiment, the plurality of second coils 220 are corner-connected, and the plurality of first coils 210 are star-connected to the plurality of second coils 220, so that the plurality of first coils 210 and the plurality of second coils 220 form a star-angle hybrid wire, which can improve winding coefficients and simultaneously reduce low-order magnetic potential harmonics, thereby improving power density of the motor and improving torque ripple.

Specifically, the sum of the numbers of the plurality of first coils 210 and the plurality of second coils 220 is the same as the number of the core blocks 100.

In the case that the stator assembly 200 is applied to a servo motor, the stator core includes 12 core blocks 100, each core block 100 includes one tooth 120, a plurality of first coils 210 or a plurality of second coils 220 are wound around the tooth 120, the plurality of first coils 210 and the plurality of second coils 220 are connected in star or angle, and a winding coefficient of the servo motor is 0.933. The plurality of first coils 210 and the plurality of second coils 220 employ a star-delta hybrid wiring winding factor of 0.966. Further, by adopting the mode of mixed wiring of the plurality of first coils 210 and the plurality of second coils 220, the winding coefficient of the motor can be effectively improved.

Specifically, the plurality of first coils 210 includes six first coils 210. The plurality of second coil 220 corners includes six second coils 220.

The second coils 220 are connected in a corner manner, and the first coils 210 are connected to the second coils 220 in a star shape.

The plurality of second coils 220 are divided into three groups of coils, namely a first group of coils 222, a second group of coils 224 and a third group of coils 226, wherein each of the first group of coils 222, the second group of coils 224 and the third group of coils 226 comprises two second coils 220, the two second coils 220 of the same group are connected, and then the first group of coils 222, the second group of coils 224 and the third group of coils 226 are sequentially connected to form a triangle wiring mode.

The plurality of first coils 210 are also divided into three groups of coils, namely a fourth group of coils 212, a fifth group of coils 214 and a sixth group of coils 216, wherein each group of coils of the fourth group of coils 212, the fifth group of coils 214 and the sixth group of coils 216 comprises two first coils 210, and the two first coils 210 are connected.

The intersection of the first set of coils 222 and the second set of coils 224 is connected to the first end of the fourth set of coils 212, the intersection of the second set of coils 224 and the third set of coils 226 is connected to the first end of the fifth set of coils 214, and the intersection of the first set of coils 222 and the third set of coils 226 is connected to the first end of the sixth set of coils 216.

The second ends of the fourth set of coils 212, the fifth set of coils 214 and the sixth set of coils 216 are lead-out ends, and can be connected with a driver of the motor, so that the motor can be controlled.

The present embodiment provides a stator assembly 200, which further includes the following technical features in addition to the technical features of the above-described embodiments.

The ratio of the number of turns of each of the plurality of second coils 220 to the number of turns of each of the plurality of first coils 210 is 1.5 or more and 2 or less.

In this embodiment, the ratio of the number of turns of each second coil 220 to the number of turns of each first coil 210 is 1.5 to 2, and the ratio of the number of turns of the second coil 220 to the number of turns of the first coil 210 is within this range, so that the slot space can be more fully utilized while ensuring magnetomotive force balance.

Specifically, the ratio of the number of turns of each second coil 220 to the number of turns of each first coil 210 is 1.732.

Specifically, the ratio of the number of turns of each second coil 220 to the number of turns of each first coil 210 is 1.5.

Specifically, the ratio of the number of turns of each second coil 220 to the number of turns of each first coil 210 is 2.

The present embodiment provides a stator assembly 200, which further includes the following technical features in addition to the technical features of the above-described embodiments.

The ratio of the wire cross-sectional area of each of the plurality of second coils 220 to the wire cross-sectional area of each of the plurality of first coils 210 is greater than or equal to 0.5 and less than or equal to 0.9.

In this embodiment, the ratio of the wire cross-sectional area of each second coil 220 to the wire cross-sectional area of each first coil 210 is 0.5 to 0.9, and the ratio of the wire cross-sectional area of the second coil 220 to the wire cross-sectional area of the first coil 210 is within this range, so that the magnetomotive force balance can be further improved while the slot space can be more fully utilized.

Specifically, the ratio of the wire cross-sectional area of each second coil 220 to the wire cross-sectional area of each first coil 210 is 0.76.

Specifically, the ratio of the wire cross-sectional area of each second coil 220 to the wire cross-sectional area of each first coil 210 is 0.5.

Specifically, the ratio of the wire cross-sectional area of each second coil 220 to the wire cross-sectional area of each first coil 210 is 0.9.

Specifically, the first coil 210 and the second coil 220 are enameled wires, the enameled wires are coated with a layer of insulating varnish, and the wire cross-sectional area of the first coil 210 and the wire cross-sectional area of the second coil 220 are both diameters of the metal wires. The metal wire may be a copper wire or an aluminum wire.

In one embodiment of the present invention, an electric machine is provided that includes a stator assembly 200 as in any of the embodiments described above. The motor thus provides all of the benefits of the stator assembly 200 of any of the embodiments described above.

The motor further comprises a rotor assembly coaxially arranged inside the stator assembly 200, and an air gap is arranged between the rotor assembly and the stator assembly 200.

The motor is a servo motor.

As shown in fig. 5, the cogging torque peak of the motor in the related art was 10.7mNm, and the magnitude of the cogging torque of the motor provided in the present application was only 4.54mNm. Due to the adoption of the stator tooth shoe grooves, the air gap flux guide space distribution is changed, the specific air gap flux density harmonic content is weakened, and the cogging torque is reduced by 57.6%.

As shown in fig. 6, the motor provided by the present application improves overload capability of the motor by providing the groove 160 at the tooth shoe 130 and the size of the slot 150 of the winding groove 140 to be a proper ratio, and simultaneously the plurality of first coils 210 and the plurality of second coils 220 are connected by star-delta hybrid, the winding coefficient of the motor is improved from 0.933 to 0.966, the output torque of the motor is improved from 4.486Nm of the motor in the related art to 4.96Nm, and the improvement ratio is 10.7% as compared with the motor in the related art. And the output torque of the motor is smoother, so that the torque fluctuation of the motor is effectively reduced.

And as shown in the table one, compared with the motor in the related art, the 5 th harmonic and the 7 th harmonic of the no-load counter potential of the motor are almost completely eliminated, and the 6 th harmonic corresponding to torque fluctuation is eliminated.

List one

The torque fluctuation of the motor at the rated working point is reduced to 0.7% from 1.7%, and the torque fluctuation at the peak torque is reduced to 0.17% from 1.13%, so that the torque fluctuation is effectively restrained.

In one embodiment of the present invention, a servo system is provided comprising a motor according to any of the embodiments described above, whereby the master system has all the advantages of a motor according to any of the embodiments described above.

In the claims, specification and drawings of the present invention, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and making the description process easier, and not for the purpose of indicating or implying that the device or element in question must have the particular orientation described, be constructed and operated in the particular orientation, and therefore such description should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly, and may be, for example, a fixed connection between a plurality of objects, a removable connection between a plurality of objects, or an integral connection; the objects may be directly connected to each other or indirectly connected to each other through an intermediate medium. The specific meaning of the terms in the present invention can be understood in detail from the above data by those of ordinary skill in the art.

In the claims, specification, and drawings of the present invention, the descriptions of terms "one embodiment," "some embodiments," "particular embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (16)

1. A stator core, comprising:

a plurality of core blocks arranged in a circumferential direction, each of the plurality of core blocks including a yoke portion, a tooth portion, and a tooth shoe;

the first end of the tooth part is connected with the yoke part, and the second end of the tooth part extends to the axis of the stator core;

the tooth shoe is arranged at the second end of the tooth part;

a wire winding groove is formed between the tooth parts of the adjacent iron core blocks in the plurality of iron core blocks, and a notch is formed between the tooth shoes of the adjacent iron core blocks in the plurality of iron core blocks;

the tooth shoe is provided with a groove which is recessed towards the yoke part on one side of the notch.

2. A stator core according to claim 1, characterized in that the edges of the tooth shoes at the recesses extend in a curved and/or straight line.

3. The stator core according to claim 1, wherein the number of the teeth shoes is two, the two teeth shoes are respectively disposed on both sides of the teeth, and the grooves on the two teeth shoes are symmetrical with respect to the teeth.

4. The stator core according to claim 1, wherein the grooves on both sides of the winding slot in the circumferential direction are symmetrical with respect to the winding slot.

5. The stator core according to claim 1, wherein the width of the groove in the circumferential direction is larger than the depth in the radial direction.

6. The stator core according to claim 5, wherein a ratio of a width of the groove in a circumferential direction to a depth of the groove in a radial direction is 3 or more and 5 or less.

7. The stator core of claim 1, wherein a depth of the groove in a radial direction is smaller than a height of the slot in the radial direction.

8. The stator core according to any one of claims 1 to 7, wherein a ratio of a width of the notch in a circumferential direction to a height of the notch in a radial direction is 5 or more and 7 or less.

9. The stator core according to any one of claims 1 to 7, wherein one of the adjacent core blocks is provided with a clamping groove, and the other core block is provided with a buckle, and the buckle is clamped in the clamping groove.

10. A stator assembly comprising a stator core as claimed in any one of claims 1 to 9.

11. The stator assembly of claim 10, further comprising:

the stator winding is wound on the tooth part and comprises a plurality of first coils and a plurality of second coils, the second coils are connected in angle joint, and the first coils are connected with the second coils in star shape.

12. The stator assembly of claim 11, wherein a ratio of a number of turns of each of the plurality of second coils to a number of turns of each of the plurality of first coils is greater than or equal to 1.5 and less than or equal to 2.

13. The stator assembly of claim 11, wherein a ratio of a wire cross-sectional area of each of the plurality of second coils to a wire cross-sectional area of each of the plurality of first coils is greater than or equal to 0.5 and less than or equal to 0.9.

14. An electric machine comprising a stator assembly as claimed in any one of claims 10 to 13.

15. The motor of claim 14, wherein the motor is a servo motor.

16. A servo system comprising a motor as claimed in claim 14 or 15.