Inner rotor brushless permanent magnet direct current motor without shell shape

Abstract

The utility model provides an inner rotor brushless permanent magnet direct current motor without a shell shape, which belongs to the technical field of electric tool motors and comprises a motor main body. According to the utility model, the phase power line of the Hall plate assembly is connected with the controller on the equipment, the Hall element of the Hall plate assembly induces the position angle condition of the magnet in the rotor assembly, the controller orderly supplies power to the stator assembly, the motor main body has no rotor core, and the rotor core, the process and the tool do not need to be assembled by stamping; the motor body is compact in structure, small in size and high in applicability, the magnets can be limited and fixed under the arrangement of the first sheath, the second sheath and special glue, and the motor body can be cooled by positive and negative rotation air draft under the arrangement of the axial-flow blades of the rotor fan blades, so that the service life of the motor body is prolonged. Therefore, the problem that the motor main body is easy to fail in a high-temperature environment is solved, and the service life of the motor main body in the high-temperature environment is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric tool motor technical field especially relates to a no shell shape's internal rotor brushless permanent magnet DC motor. BACKGROUND

[0002] The motor in the electric tool is the key component of electric energy conversion into mechanical energy, it can drive drill bit, electric hammer etc.

[0003] The existing electric tool in similar small shell, front and rear end cover's internal rotor brushless permanent magnet DC motor in use, motor rotor fan blade cannot realize two direction rotation to motor body cooling, continuous operation stator leather insulation layer accelerates ageing, has influenced motor whole operation in high temperature environment's service life, and rotor structure is complicated, axial limit exists unstable hidden factors, motor structure is complicated, and the matching small electric tool general small, and rotor structure is complicated, and the overall cost is high. UTILITY MODEL CONTENTS

[0004] In order to solve above-mentioned problem, the utility model provides a no shell shape's internal rotor brushless permanent magnet DC motor to more exactly solve the motor rotor structure complicated cost high of existing electric tool, and poor applicability, and poor service life in high temperature environment.

[0005] The utility model discloses the following technical scheme realizes:

[0006] The utility model provides a no shell shape's internal rotor brushless permanent magnet DC motor, including motor body, the motor body includes rotor assembly and stator assembly, and rotor assembly can rotate in rotating magnetic field and assists to complete the cooling of electrode body, and stator assembly can produce rotating magnetic field.

[0007] Further, the rotor assembly includes shaft branch, front bearing, rotor fan blade, No. 1 sheath, multiple groups of magnet, No. 2 sheath and rear bearing, the shaft branch is cylindrical structure, the front bearing is installed in the outside of shaft branch, the rotor fan blade is installed in the outside of shaft branch and is located at the side of front bearing, the No. 1 sheath is installed in the outside of shaft branch, and multiple groups of magnet are arranged in No. 1 sheath and located in the outside of shaft branch, No. 2 sheath is installed in the outside of one end of magnet, and rear bearing is installed in the outside of shaft branch.

[0008] Further, the outside of one end of shaft branch is provided with external thread, and the rotor fan blade adopts axial flow type blade.

[0009] Further, the first sheath and the second sheath are located at two ends of the plurality of magnets, the plurality of magnets have an arc-shaped structure in cross section, and special glue is arranged between the magnets, the first sheath and the second sheath.

[0010] Further, the front bearing is larger in size than the rear bearing, and the front bearing and the rear bearing are symmetrically arranged.

[0011] Further, the stator assembly comprises a front line bracket, a stator chip, a plurality of insulating papers, a varnished wire, a rear line bracket and a Hall plate assembly, the front line bracket is sleeved and arranged outside the shaft branch, the stator chip is sleeved and arranged outside the magnet, the plurality of insulating papers are arranged in the stator chip, the varnished wire is arranged in the stator chip, the rear line bracket is sleeved and arranged outside the shaft branch, and the Hall plate assembly is sleeved and arranged outside the shaft branch and located at one side of the rear bearing.

[0012] Further, the front line bracket and the rear line bracket are symmetrically located at two ends of the stator chip, and the front line bracket, the rear line bracket and the stator chip are inserted together.

[0013] Further, the Hall plate assembly is composed of phase power lines and Hall elements, and the Hall plate assembly is inserted with the rear line bracket.

[0014] The utility model discloses a beneficial effect:

[0015] The utility model discloses a kind of inner rotor brushless permanent magnet DC motor of no shell shape, motor main body is composed of rotor assembly and stator assembly, and is fixed to the shell of electric tool assembly, is connected by the phase power line of Hall plate assembly with the controller on equipment, the Hall element of Hall plate assembly senses the magnet position angle condition in rotor assembly, controller orderly supplies power to stator assembly, the motor main body without rotor core, without stamping assembly rotor core and process, tooling, save labor and product cost, motor main body structure is compact, small, high applicability, under the setting of first sheath, second sheath and special glue, magnet can be fixed limit, avoid the problem of unstable rotor assembly appears hidden, under the axial flow blade setting of rotor fan blade, it can be realized that positive and negative rotation extracts wind and cools motor main body, and then solve the problem that motor main body is prone to failure in high temperature environment, prolong the service life of motor main body in high temperature environment. ACCURACY OF DRAWINGS

[0016] Figure 1 It is the overall structure schematic diagram of the utility model;

[0017] Figure 2 It is the overall back structure schematic diagram of the utility model;

[0018] Figure 3 It is the rotor assembly explosion structure schematic diagram of the utility model;

[0019] Figure 4 The utility model discloses an explosion structure schematic view of the stator assembly.

[0020] The signs are as follows:

[0021] In the drawing: 1, motor main body;2, rotor assembly;3, stator assembly;4, axle branch;5, front bearing;6, rotor fan blade;7, No. 1 sheath;8, magnet;9, No. 2 sheath;10, special glue;11, rear bearing;12, front line frame;13, stator chip;14, insulating paper;15, varnished wire;16, rear line frame;17, hall board assembly. Specific implementation

[0022] In order to more clearly and completely illustrate the technical scheme of the utility model, the utility model will be further described below in combination with the drawings.

[0023] Please refer to Figures 1-4The utility model provides a kind of inner rotor brushless permanent magnet DC motor without shell shape, including motor main body 1, the motor main body 1 includes rotor assembly 2 and stator assembly 3, rotor assembly 2 can rotate in rotating magnetic field and auxiliary complete cooling of electrode main body 1, stator assembly 3 can produce rotating magnetic field, the rotor assembly 2 includes shaft branch 4, front bearing 5, rotor fan blade 6, No.

[0024] The stator assembly 3 comprises a front line bracket 12, a stator core 13, a plurality of insulating papers 14, a lacquered wire 15, a rear line bracket 16 and a Hall plate assembly 17, the front line bracket 12 is sleeved and installed outside the shaft branch 4, the stator core 13 is sleeved and installed outside the magnet 8, the plurality of insulating papers 14 are inserted and installed in the stator core 13, the lacquered wire 15 is inserted and installed in the stator core 13, the rear line bracket 16 is sleeved and installed outside the shaft branch 4, the Hall plate assembly 17 is sleeved and installed outside the shaft branch 4 and located at one side of the rear bearing 11, the front line bracket 12 and the rear line bracket 16 are symmetrically located at both ends of the stator core 13, the front line bracket 12, the rear line bracket 16 and the stator core 13 are inserted together, the Hall plate assembly 17 is composed of phase power lines and Hall elements, the Hall plate assembly 17 is inserted and connected with the rear line bracket 16, after the installation of the second sheath 9 is completed, the user inserts the insulating paper 14 into the stator core 13 first, then inserts the lacquered wire 15 into the insulating paper 14, then sleeves the front line bracket 12 outside the shaft branch 4, then inserts and connects the stator core 13 and the front line bracket 12 together, then inserts and connects the rear line bracket 16 and the stator core 13 together, then inserts and connects the Hall plate assembly 17 and the rear line bracket 16 together, finally, sleeves the rear bearing 11 outside the shaft branch 4, so that the installation and fixation of the rotor assembly 2 and the stator assembly 3 are completed.

[0025] In the present embodiment

[0026] When the brushless permanent magnet DC motor without the outer shell shape is used, the motor body 1 is without the rotor core, and the punching assembly rotor core and the process, tooling are not needed, the labor and the product cost are saved, the motor body 1 is compact in structure, small in size, high in applicability, the motor body 1 is composed of the rotor assembly 2 and the stator assembly 3, and is fixedly arranged in the shell of the electric tool, is connected with the controller on the equipment through the phase power line of the Hall plate assembly 17, the Hall element of the Hall plate assembly 17 senses the position angle condition of the magnet 8 in the rotor assembly 2, the controller sequentially supplies power to the stator assembly 3, the three-phase winding generates a rotating magnetic field to drag the rotor assembly 2 to rotate, and then drives the rotation of the output end, when the motor body 1 is assembled, the user first sets the front bearing 5 on the outside of the shaft branch 4, then sets the rotor fan blade 6 on the outside of the shaft branch 4, then sets the first protective sleeve 7, after the first protective sleeve 7 is set, the multiple groups of magnets 8 are arranged in the first protective sleeve 7, then the second protective sleeve 9 is set on the outside of the shaft branch 4, under the setting of the first protective sleeve 7, the second protective sleeve 9 and the special glue 10, the magnets 8 can be limited and fixed, the problem of unstable rotor assembly 2 is avoided, under the setting of the axial flow type blade of the rotor fan blade 6, the motor body 1 can be forward and reverse rotated to cool, and the problem that the motor body 1 is prone to failure in a high-temperature environment is solved, the service life of the motor body 1 in the high-temperature environment is prolonged, after the installation of the second protective sleeve 9 is completed, the user first inserts the insulating paper 14 into the stator chip 13, then inserts the varnish leather wire 15 into the insulating paper 14, then sets the front wire frame 12 on the outside of the shaft branch 4, then inserts the stator chip 13 and the front wire frame 12 together, then inserts the rear wire frame 16 and the stator chip 13 together, then inserts the Hall plate assembly 17 and the rear wire frame 16 together, and finally sets the rear bearing 11 on the outside of the shaft branch 4, so that the installation and fixation of the rotor assembly 2 and the stator assembly 3 are completed, and the assembly of the motor body 1 is completed.

[0027] Of course, the utility model also can have other various implementation manners, based on this implementation manner, other implementation manners obtained by the ordinary skilled person in the art without any creative labor all belong to the range protected by the utility model.

Claims

1. A housing-less, inner rotor, brushless, permanent magnet, DC motor, characterized by, The motor body comprises a rotor assembly and a stator assembly, the rotor assembly can rotate in a rotating magnetic field and assist to cool the motor body, and the stator assembly can generate the rotating magnetic field; The rotor assembly comprises a shaft, a front bearing, a rotor fan blade, a first sheath, a plurality of magnets, a second sheath and a rear bearing, the shaft is in a cylindrical structure, the front bearing is sleeved on the outside of the shaft, the rotor fan blade is sleeved on the outside of the shaft and located on one side of the front bearing, the first sheath is sleeved on the outside of the shaft, the plurality of magnets are arranged in the first sheath and located on the outside of the shaft, the second sheath is sleeved on the outside of one end of the magnets, and the rear bearing is sleeved on the outside of the shaft.

2. A brushless DC motor without housing shape of internal rotor according to claim 1, characterized in that, An external thread is formed on one end of the shaft, and the rotor fan blade is an axial flow blade.

3. A brushless DC motor without housing shape of internal rotor according to claim 1, characterized in that, The first sheath and the second sheath are located at two ends of the plurality of magnets, the plurality of magnets are in an arc structure in cross section, and special glue is arranged between the magnets and the first sheath and the second sheath.

4. A brushless DC motor without housing shape of internal rotor according to claim 1, characterized in that, The size of the front bearing is greater than that of the rear bearing, and the front bearing and the rear bearing are symmetrically arranged.

5. A brushless DC motor without housing shape of internal rotor according to claim 1, characterized in that, The stator assembly comprises a front wire holder, a stator chip, a plurality of insulating papers, a varnished wire, a rear wire holder and a Hall plate assembly, the front wire holder is sleeved on the outside of the shaft, the stator chip is sleeved on the outside of the magnets, the plurality of insulating papers are sleeved in the stator chip, the varnished wire is sleeved in the stator chip, the rear wire holder is sleeved on the outside of the shaft, and the Hall plate assembly is sleeved on the outside of the shaft and located on one side of the rear bearing.

6. A brushless DC motor without housing shape of internal rotor according to claim 5, characterized in that, The front wire holder and the rear wire holder are symmetrically located at two ends of the stator chip, and the front wire holder, the rear wire holder and the stator chip are inserted together.

7. A brushless DC motor without housing and with an internal rotor without a shape according to claim 5, characterized in that The Hall plate assembly is composed of an alternating current power line and a Hall element, and the Hall plate assembly and the rear wire holder are inserted and arranged.

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