CN212033883U

CN212033883U - External rotor micromotor with built-in controller

Info

Publication number: CN212033883U
Application number: CN202020769879.7U
Authority: CN
Inventors: 隆春香; 魏亚兰; 刘跃龙
Original assignee: Nichibo Motor Shenzhen Co ltd
Current assignee: Nichibo Motor Shenzhen Co ltd
Priority date: 2020-05-11
Filing date: 2020-05-11
Publication date: 2020-11-27
Anticipated expiration: 2030-05-11

Abstract

The utility model provides an external rotor micromotor of built-in controller, include: the rotor comprises a front end cover bracket, a control circuit board and a rotor shaft, wherein the front end cover bracket is fixedly arranged outwards; the rotor shaft is exposed out of the front end cover support and outputs outwards; the control circuit board is externally connected with a power supply and supplies power to the internal circuit, the control circuit board comprises a thermistor, and the thermistor detects the temperature of the external rotor micromotor of the built-in controller so as to enable the external power supply and the control circuit board to be disconnected or connected. The utility model provides a rotor shaft output passes the front end housing support and exports externally, and the rotor shaft is big with the area of contact of front end housing support, enables the rotor shaft and stably lies in the axis, avoids the rotor shaft skew to appear at the operation in-process, guarantees the rotor shaft and stablizes the output, reduces the problem that the bearing was worn and torn because of the rotor shaft skew.

Description

External rotor micromotor with built-in controller

Technical Field

The utility model relates to a micromotor technical field especially relates to an external rotor micromotor of built-in controller.

Background

The existing fascia gun product is internally provided with a micro-motor as a driving device, the micro-motor has the advantages of small volume, large torsion and the like, and in order to provide output requirements of different powers, the micro-motor is usually internally provided with a controller to adjust the output power of the motor. For the micromotor in the fascia gun, in order to save cost, the micromotor generally adopts a structure of a stretching iron shell, the output shaft of the motor is positioned at one end of the stretching iron shell, and the holding force between the iron shell and the rotor is small. The rotor often deviates from the axis in the operation process, the operation is unbalanced, and the bearing is seriously abraded, so that the service life of the motor is influenced. Meanwhile, for a high-power motor, the motor applied to the fascia gun is not designed to be monitored, so that the problem that the motor is damaged due to overheating of the motor is easy to occur; although a technical scheme that the power of the motor is adjusted by limiting current to be introduced is adopted in part of the motors, the output of the motors is also limited by the technical scheme, and the output power of the fascial gun cannot meet the requirements of users.

SUMMERY OF THE UTILITY MODEL

In order to solve the motor structure instability among the prior art among the manadesma rifle, high-power motor easily leads to the problem of damage because of generating heat, the utility model provides a little motor of external rotor of built-in controller.

The utility model discloses a following technical scheme realizes:

an external rotor micro-motor with a built-in controller, comprising: the rotor comprises a front end cover bracket, a control circuit board and a rotor shaft, wherein the front end cover bracket is fixedly arranged outwards;

the rotor shaft penetrates through the front end cover support and is exposed out of the front end cover support, and the outer rotor micro motor with the built-in controller outputs the rotor shaft outwards through the front end of the front end cover support;

the control circuit board is externally connected with a power supply and supplies power to an internal circuit of the external rotor micromotor of the built-in controller, the control circuit board comprises a thermistor, and the thermistor detects the temperature of the external rotor micromotor of the built-in controller so as to enable the external power supply and the control circuit board to be disconnected or connected.

Further, the control circuit board comprises a field effect transistor, and the field effect transistor is connected with the thermistor through heat conducting glue.

Furthermore, the rotor shaft comprises a clamping groove, a clamping spring is installed on the clamping groove, and the front end of the front end cover support abuts against the clamping spring.

Further, a gasket is arranged between the front end cover support and the control circuit board, and the control circuit board is attached to the front end cover support through the gasket.

Furthermore, the external rotor micromotor with the built-in controller comprises a stator, a positioning key is arranged on the stator, the front end cover support comprises a positioning groove, the stator is sleeved on the front end cover support, and the positioning key enters the positioning groove.

Further, the external rotor micro-motor with the built-in controller further comprises: the rear end cover is arranged at the rear end of the rotor shaft, the magnets are arranged on the rear end cover, and the shell is arranged on the rear end cover and covers the magnets.

The rear end cover comprises a central hole, and the rotor shaft is arranged in the central hole in an interference mode, so that the rotor shaft and the rear end cover are relatively fixed.

Furthermore, the edge of the rear end cover is provided with a plurality of positioning teeth, the outer rotor micromotor with the built-in controller further comprises a plurality of magnets, and the magnets are fixedly arranged between every two adjacent positioning teeth.

Further, the rear end cover comprises a glue groove, and glue liquid for bonding the rear end cover and the shell is filled in the glue groove.

Further, the casing is including being located shells inner wall's bonding region, the bonding region is the corrugate, the magnetite pastes in shells inner wall.

The beneficial effects of the utility model reside in that:

the utility model provides a rotor shaft output end passes the front end housing support to export at front end housing support end, compare the technical scheme that traditional rotor shaft exported on tensile iron-clad one side, the area of contact of rotor shaft and front end housing support is big, and when rotor shaft exported outward, front end housing support can make rotor shaft stably lie in the axis, avoids rotor shaft skew to appear in the operation process, guarantees rotor shaft steady output, reduces the problem that the bearing was worn and torn because of rotor shaft skew;

the utility model discloses still be provided with control circuit board, when the rotor shaft was long because of operating time, produced the inside time that generates heat of motor when the rotor shaft, the last thermistor of control circuit board can break off external circuit, and stop motor work cools off rotor shaft and motor internals to guarantee that the motor can not cause the problem of motor damage because of the high temperature.

Drawings

Fig. 1 is a schematic perspective view of the present invention;

fig. 2 is a schematic perspective view of the control circuit board according to the present invention;

fig. 3 is a schematic exploded view of the present invention;

fig. 4 is a schematic perspective view of the stator of the present invention;

fig. 5 is a schematic perspective view of the middle rear end cap of the present invention.

Detailed Description

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the following description of the present invention will refer to the accompanying drawings and illustrate embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1 and 2, the present invention discloses an external rotor micro motor with a built-in controller, including: the rotor comprises a front end cover support 2 used for being fixedly installed outwards, a control circuit board 3 installed on the rear side of the front end cover support 2, and a rotor shaft 1 installed on the front end cover support 2.

The rotor shaft 1 penetrates through the front end cover support 2 and is exposed out of the front end cover support 2, and the external rotor micro motor with the built-in controller outputs power outwards through the rotor shaft 1 at the front end of the front end cover support 2.

In this embodiment, compare in traditional external rotor electric machine, the utility model provides a rotor shaft 1 wears out front end housing support 2 to at the external output of front end housing support 2's front end. Because front end housing support 2 is to external installation fixed knot construct, compare in traditional tensile iron-clad and have certain thickness, rotor shaft 1 is bigger with front end housing support 2's holding power, more can ensure rotor shaft 1 and keep on the axis at the in-process of external output, avoids rotor shaft 1's axis to change, and the output of motor is stable. The rotor shaft 1 does not deviate from the axis, so that the bearing abrasion can be reduced, and the service life of the motor is prolonged.

The utility model discloses still be provided with control circuit board 3 on front end housing support 2, control circuit board 3 is used for putting through external power supply and control, accommodate motor's output. In the process of continuous output of the motor, the temperature inside the motor rises due to current work and bearing abrasion, in order to avoid damaging the motor due to the rise of the temperature of the motor, the control circuit board 3 is provided with the thermistor 31, and the thermistor 31 detects the temperature of the external rotor micro-motor of the built-in controller so as to enable an external power supply to be disconnected or connected with the control circuit board 3.

In this embodiment, the thermistor 31 is a sensitive element that changes resistance with temperature change, when the internal temperature of the motor rises, the thermistor 31 changes resistance, and the thermistor 31 is connected with circuit elements such as a comparator and a relay, so that when the resistance value of the thermistor 31 changes, an external circuit is disconnected from the control circuit board 3, the external circuit stops supplying power to the external rotor micro-motor with the built-in controller, the motor stops working, the temperature of the motor drops, and the problem that the internal parts of the motor are burnt and damaged and the motor cannot be used due to heat generation is solved. Preferably, the thermistor 31 is a negative temperature coefficient thermistor (NTC).

In an embodiment of the present invention, the control circuit board 3 controls the external rotor micro motor with the built-in controller through a field effect transistor (not shown). A field effect transistor (MOS) is a semiconductor field effect transistor commonly used in the art of micro-motors for controlling the output power of the micro-motor. In the heating process of the motor, the field effect transistor is usually damaged firstly, so that the thermistor 31 is connected with the field effect transistor through heat conducting glue, when the temperature of the field effect transistor rises due to the working influence of the motor, the resistance value of the thermistor 31 is reduced, the motor is disconnected with an external power supply, the motor stops working, and the effect of protecting the field effect transistor is achieved.

Referring to fig. 3, since the rotor shaft 1 passes through the front end cover bracket 2 to output work to the outside, in order to ensure that the rotor shaft 1 is separated from the front end cover bracket 2, a clamping groove 10 is arranged at the front end of the rotor shaft 1, a clamp spring 21 is installed on the clamping groove 10, and the front end of the front end cover bracket 2 abuts against the clamp spring 21. The rotor shaft 1 is prevented from being separated from the front end cover support 2 in the working process.

In order to ensure a stable connection of the front end cap holder 2 to the control circuit board 3, a gasket 23 is included between the front end cap holder 2 and the control circuit board 3, and the control circuit board 3 is abutted against the front end cap holder 2 through the gasket 23. The gasket 23 is used to protect the control circuit board 3: when the control circuit board 3 is connected with the front end cover bracket 2 through threads, the gasket 23 provides elastic protection for the control circuit board 3, and the control circuit board 3 is prevented from being damaged due to extrusion in the thread connection process; the gasket 23 provides buffer protection for the control circuit board 3 when the motor outputs externally, so as to prevent the control circuit board 3 from being broken or elements from being damaged due to abrasion.

Referring to fig. 3 and 4, the external rotor micro-motor with the built-in controller includes a stator 4, a positioning key 40 is disposed on the stator 4, the front end cover bracket 2 includes a positioning groove 22, the stator 4 is sleeved on the front end cover bracket 2, and the positioning key 40 enters the positioning groove 22.

In the above embodiment, the stator 4 is wound with a coil, and the coil is internally electrified with current, so as to drive the magnet 6 to move under the electromagnetic action, and further drive the rotor to rotate. Stator 4 is when drive magnetite 6 is rotatory, and the reaction force of 6 magnetite also is received to self, and in order to prevent stator 4 rotatory, be provided with a arch on the 4 inner walls of stator, do positioning key 40, stator 4 are in the suit when on the front end housing support 2, positioning key 40 gets into in the constant head tank 22, prevent stator 4 for front end housing support 2 is rotatory, plays the effect of firm stator 4.

Referring to fig. 2 and 5, the utility model drives the rotor shaft 1 to rotate to output externally by the following way: the external rotor micromotor with the built-in controller further comprises: the rotor comprises a rear end cover 5 installed at the rear end of the rotor shaft 1, a plurality of magnets 6 installed on the rear end cover 5, and a shell 7 installed on the rear end cover 5 and covering the magnets 6.

In this embodiment, the magnets 6 are moved by the electromagnetic induction of the coil of the stator 4, and the structure of the external rotor motor is such that the magnets 6 are located at the periphery of the stator 4, and the stator 4 is fixed at the center of the motor, so that the magnets 6 drive the rear end cover 5 to rotate, and further drive the rotor shaft 1 fixed on the rear end cover 5 to rotate, and the housing 7 fixed on the rear end cover 5 and the rear end cover 5 rotate synchronously.

In order to ensure that the rotor shaft 1 and the rear end cover 5 are relatively fixed and avoid the problem that the rotor shaft 1 cannot rotate and output outwards due to the fact that the rotor shaft 1 and the rear end cover 5 move relatively, the rear end cover 5 comprises a central hole 51, and the rotor shaft 1 is installed in the central hole 51 in an interference mode, so that the rotor shaft 1 and the rear end cover 5 are relatively fixed. The interference fit has the specific significance that: the diameter of the rotor shaft 1 is larger than the diameter of the central hole 51, and a plurality of slits are provided on the rear end of the rotor shaft 1 to fit the rotor shaft 1 to the central hole 51. The interference fit can reinforce the rotor shaft 1 and the rear end cover 5, and ensure the relative fixation of the rear end cover 5 and the rotor shaft 1.

Because the utility model discloses an external rotor electric machine's a, need ensure that 6 stable drive rear end housing 5 of magnetite, therefore, 5 borders in rear end housing are provided with a plurality of location teeth 52, the little motor of external rotor of built-in controller still includes a plurality of magnetite 6, 6 fixed mounting of magnetite are adjacent two between the location tooth 52. Compared with the magnet 6 which is only fixed by glue solution, the positioning teeth 52 can reinforce the connection between the magnet 6 and the rear end cover 5, and prevent the magnet 6 from separating from the rear end cover 5.

The shell 7 is adhered to the rear end cover 5 in an adhering mode, the rear end cover 5 comprises a glue groove 53, and glue liquid is filled in the glue groove 53. The glue tank 53 is used for storing glue to bond the housing 7.

Further, in order to ensure the connection between the housing 7 and the magnet 6, the housing 7 includes an adhesive region 70 located on an inner wall of the housing 7, the adhesive region 70 is corrugated, and the magnet 6 is adhered to the inner wall of the housing 7. Compare in smooth casing 7 inner wall, become the bonding relation of corrugate casing 7 inner wall can strengthen magnetite 6 and casing 7, stabilize the inner structure of motor, ensure the stable work of motor. The utility model provides a rotor shaft 1 output passes front end housing bracket 2 to export in front end housing bracket 2 end, compare the technical scheme that traditional rotor shaft 1 exported in tensile iron-clad one side, rotor shaft 1 is big with front end housing bracket 2's area of contact, rotor shaft 1 is when exporting outward, front end housing bracket 2 can make rotor shaft 1 stably be located the axis, avoid rotor shaft 1 to squint in the operation process, guarantee rotor shaft 1 and stabilize the output, reduce the bearing because of the problem of rotor shaft 1 squint and wear;

the utility model discloses still be provided with control circuit board 3, when rotor shaft 1 is long because of operating time, when producing the inside generating heat of motor, thermistor 31 on control circuit board 3 can disconnect external circuit, stop motor work, cool off rotor shaft 1 and motor internals to guarantee that the motor can not cause the problem of motor damage because of the high temperature.

It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims

1. An external rotor micro-motor with a built-in controller, comprising: the rotor comprises a front end cover bracket, a control circuit board and a rotor shaft, wherein the front end cover bracket is fixedly arranged outwards;

2. The external rotor micro-motor with a built-in controller according to claim 1, wherein the control circuit board comprises a field effect transistor, and the field effect transistor is connected with the thermistor through a heat conducting glue.

3. The external rotor micro-motor with a built-in controller according to claim 1, wherein the rotor shaft comprises a clamping groove, a clamping spring is mounted on the clamping groove, and the front end of the front end cover bracket abuts against the clamping spring.

4. The external rotor micro-motor with a built-in controller according to claim 1, wherein a gasket is included between the front end cover bracket and the control circuit board, and the control circuit board is abutted against the front end cover bracket through the gasket.

5. The external rotor micro-motor with a built-in controller according to claim 1, wherein the external rotor micro-motor with a built-in controller comprises a stator, a positioning key is arranged on the stator, the front end cover bracket comprises a positioning groove, the stator is sleeved on the front end cover bracket, and the positioning key enters the positioning groove.

6. The external rotor micro-motor with built-in controller according to claim 1, further comprising: the rear end cover is arranged at the rear end of the rotor shaft, the magnets are arranged on the rear end cover, and the shell is arranged on the rear end cover and covers the magnets.

7. The external rotor micro-motor with built-in controller of claim 6, wherein the rear end cover comprises a central hole, the rotor shaft is arranged in the central hole in an interference mode, and the rotor shaft and the rear end cover are fixed relatively.

8. The external rotor micro-motor with a built-in controller according to claim 6, wherein a plurality of positioning teeth are arranged on the edge of the rear end cover, and the external rotor micro-motor with the built-in controller further comprises a plurality of magnets fixedly arranged between two adjacent positioning teeth.

9. The external rotor micro-motor with a built-in controller according to claim 6, wherein the rear end cap comprises a glue groove, and glue for bonding the rear end cap and the housing is poured into the glue groove.

10. The external rotor micro-motor with a built-in controller according to claim 6, wherein the housing comprises an adhesive region on an inner wall of the housing, the adhesive region is corrugated, and the magnet is adhered to the inner wall of the housing.