Assembled stator structure for brushless motor

Abstract

The utility model provides an assembly type stator structure for a brushless motor, which comprises an outer iron core and an inner iron core, the outer iron core comprises an annular body, the inner ring of the annular body is provided with connecting blocks at intervals, the inner iron core is provided with an inner circular hole and winding grooves arranged at intervals, and a notch is formed between each winding groove and the outer ring of the inner iron core. A plastic end plate is further arranged on the inner iron core, insulating parts are filled in the winding grooves, enameled wires are wound into the winding grooves from the notches, the connecting blocks and the notches are correspondingly assembled, and then the outer iron core and the inner iron core are welded and fixed. According to the stator structure, the structural design of the inner iron core adopts an outer ring winding technology, so that the winding production efficiency is improved, the slot fullness rate of winding can be improved, more enameled wires can be accommodated under the same slot area, the efficiency and the output power of the motor are increased, and the inner iron core adopts a complete inner circle design without a slot design, so that the service life of the motor is prolonged. The cogging torque ripple of a traditional brushless motor caused by the existence of the cogging is reduced, and the stability of the rotating speed of the motor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a brushless motor field, concretely relates to a kind of assembled stator structure for brushless motor. BACKGROUND

[0002] The stator of existing brushless motor is composed of core, winding and insulating material, the stator core is provided with many teeth (winding enameled wire) and slot (slot for winding enameled wire), and the winding of stator is wound in the slot of core by inner winding machine, the winding efficiency of inner disturbance machine is not high, and due to process reasons, it cannot be wound with high slot fill rate, which limits the efficiency and output power of brushless motor, and the size of motor is also limited, and too small motor cannot be well operated by inner winding operation.Moreover, if the motor is applied to civilian voltage occasions, the inner winding stator structure will cause the distance between enameled wire and core to not meet the safety requirements due to high slot fill rate, so that the power density and efficiency cannot be higher if traditional brushless motor is used in tools applied to civilian voltage. SUMMARY

[0003] The utility model discloses a kind of assembled stator structure for brushless motor, to solve the problem of existing technology in stator inside winding efficiency not high, slot fill rate is not enough, affect the efficiency and output power of brushless motor.

[0004] To solve the above technical problems, the utility model realizes by the following technical scheme:

[0005] A kind of assembled stator structure for brushless motor, including outer core and inner core, the outer core includes annular body, connection block is arranged at the inner circle of annular body with interval, inner circular hole and interval setting winding slot are provided on the inner core, and slot opening is formed between each winding slot and inner core outer circle, plastic end plate is further provided on the inner core, winding slot is filled with insulating piece, and enameled wire is wound in winding slot from slot opening, the connection block and slot opening are assembled in correspondence, then outer core and inner core are welded and fixed.

[0006] As preferred, the annular body is formed by a plurality of annular silicon steel sheets or open circular annular silicon steel sheets.

[0007] As preferred, the insulating piece is a plurality of insulating paper.

[0008] The utility model has the following beneficial effects:

[0009] (1) The stator structure of the utility model adopts the inner and outer iron core assembly type design, the structure design of the inner iron core can adopt the outer ring winding technology, simple operation, solves the shortage of the inner winding process, improves the winding production efficiency, after winding is completed, the outer iron core is assembled to form, can improve the slot fill factor of winding, can accommodate more enameled wire under the same slot area, increases the efficiency and output power of the motor, overcomes the limit of the stator slot fill factor of the brushless motor due to the winding process, and the shortage that the electrical insulation distance is difficult to meet caused by the high slot fill factor;

[0010] (2) The stator structure of the utility model, the outer diameter size is not limited, can set up multiple winding slots on the inner iron core, the slot number on the stator covers the slot number specification of all traditional brushless motor stators, there is no any limit to the size of the motor, all traditional brushless motor stators can adopt this design to improve the motor slot fill factor and increase the power.

[0011] (3) At the same time, the inner iron core adopts the complete inner circle design of slotless design, the stator and the rotor form uniform air gap, the pole arc of the stator is circular, reduces the tooth slot torque fluctuation caused by the tooth slot of the traditional brushless motor, improves the stability of the motor speed. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is the structure schematic view of the outer iron core in the utility model;

[0013] Fig. 2 It is the structure schematic view of the inner iron core in the utility model;

[0014] Fig. 3 It is the structure schematic view of the utility model.

[0015] In the drawing: 1-outer iron core; 2-inner iron core; 3-insulating piece; 4-enameled wire; 101-connection block; 201-inner hole; 202-winding slot; 203-slot. DETAILED DESCRIPTION

[0016] The specific embodiments of the utility model are further explained in combination with the drawings. It needs to be explained here that the explanation of these embodiments is used to help understanding the utility model, but does not constitute the limitation to the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as there is no conflict.

[0017] As Figs. 1-3As shown, a kind of assembled stator structure for brushless motor, including outer core 1 and inner core 2, outer core 1 includes annular body, and the inner circle of annular body is provided with connecting block 101 at interval, and inner core 2 is provided with inner circular hole 201 and interval setting winding slot 202, and each winding slot 202 is formed with slot 203 between inner core 2 outer circle, and inner core 2 is also provided with plastic end plate, winding slot 202 is filled with insulating piece 3, and enameled wire 4 is wound from slot 203 to winding slot 202, connecting block 101 and slot 203 are correspondingly assembled, then outer core and inner core are welded and fixed, annular body is formed by a plurality of annular silicon steel sheets laminated or by open circular annular silicon steel sheet laminated, and insulating piece 3 is a plurality of insulating paper.

[0018] When using, inner core 2 is placed winding and provides inner circular hole 201 forming air gap magnetic field with rotor, outer core 1 is mainly annular core formed by silicon steel sheet laminated, mainly provides magnetic flux path for coil after assembling, reduces magnetic resistance;After winding enameled wire 4 coil, two parts of core are assembled, finally, two parts are welded together through spot welding process, to ensure that stator is a whole, and the stator can meet all the requirements of electrical insulation strength and electrical distance required by safety regulations.

[0019] The stator structure of the utility model adopts the design of inner and outer core assembly, the structure design of inner core 2 can adopt outer circle winding technology, solves the deficiency in inner winding process, improves winding production efficiency, and is assembled with outer core 1 after winding, simple operation can improve the slot fill factor of winding, can accommodate more enameled wire 4 under the same slot area, increases the enameled wire diameter, reduces copper consumption, increases the efficiency and output power of motor, overcomes the limit of stator slot fill factor of brushless motor due to winding process, and the deficiency that electrical insulation distance is difficult to meet caused by high slot fill factor;

[0020] The stator structure of the utility model, its outer diameter size has no limit, can set a plurality of winding slots 202 on inner core 2, and the slot number on stator covers the slot number specifications of all traditional brushless motor stators, has no any limit to the size of motor, and all traditional brushless motor stators can adopt this design to improve the slot fill factor of motor and increase power;

[0021] Meanwhile, inner core 2 adopts complete inner circular hole 202 design of slotless design, so that stator and rotor form uniform air gap, air gap is 0.2-2mm, and the pole arc of stator is circular arc, reduces the tooth slot torque fluctuation caused by tooth slot of traditional brushless motor, and improves the stability of motor speed.

[0022] The above merely describes preferred embodiments of the present application, and is not intended to limit the implementation and protection scope of the present application. For those skilled in the art, it should be understood that any equivalent substitutions and obvious changes made according to the content of the present application and drawings should be included in the protection scope of the present application.

Claims

1. A modular stator structure for a brushless motor, characterized by: The outer iron core comprises a ring body, and connecting blocks are arranged on the inner ring of the ring body at intervals; the inner iron core is provided with an inner circular hole and winding slots arranged at intervals, and a notch is formed between each winding slot and the outer ring of the inner iron core; the inner iron core is further provided with a plastic end plate; the winding slots are filled with insulating pieces, and enameled wires are wound into the winding slots from the notches; and the connecting blocks and the notches are assembled correspondingly, and then the outer iron core and the inner iron core are welded and fixed.

2. The modular stator structure for a brushless motor according to claim 1, characterized in that: The ring body is formed by stacking a plurality of ring-shaped silicon steel sheets or open ring-shaped silicon steel sheets.

3. The modular stator structure for a brushless motor according to claim 1, characterized in that: The insulating pieces are insulating paper.

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