KR101111263B1

KR101111263B1 - Sensor Device For BLDC Motor

Info

Publication number: KR101111263B1
Application number: KR1020100028120A
Authority: KR
Inventors: 김영균; 서정무; 유세현; 정인성
Original assignee: 전자부품연구원
Priority date: 2010-03-29
Filing date: 2010-03-29
Publication date: 2012-02-22
Also published as: KR20110108742A

Abstract

The present invention relates to a sensor device of a BLDC motor, and the sensor device of the present invention includes an upper cover, a shaft rotating portion, a lower cover, and a sensor circuit. Here, the upper cover is formed with a hole in the center, the shaft rotation portion is disposed through the hole, the lower cover is coupled to the upper cover. The sensor circuit is disposed between the upper cover and the lower cover and is spaced apart from the end of the shaft rotation part at a predetermined interval. Here, the shaft system rotating part is a body portion disposed through the hole, the sensor circuit is spaced apart from the sensor circuit at a predetermined distance from the end of the body and disposed inside the upper cover to rotate in accordance with the rotation of the body portion and the sensor magnet holder Disclosed is a configuration that includes.

Description

Sensor device for BLDC motor {Sensor Device For BLDC Motor}

The present invention relates to a BLDC motor, and more particularly to a sensor device of a BLDC motor for detecting the rotor position of the BLDC motor.

In general, the structure of the motor consists of a stator and a rotor. In the case of the small size, the stator mainly uses permanent magnets, and the rotor is wound with a coil to flow an electric current to become an electromagnet to rotate by the interaction between the stator and the rotor. At this time, the brush part has a structure that allows the power to continue to be supplied even when the rotor is rotating.

However, with the recent development of semiconductors, permanent magnets are used for the rotor and coils are supplied to the stator to supply power to the magnetizers. Therefore, if the stator rotates, the rotor corresponding to it magnetically also rotates. . Such an electric motor is called a brushless DC motor (BLDC motor).

The BLDC motor can be expected to minimize the power consumption and improve the efficiency of the entire system because the rotor is a permanent magnet and the magnetic flux is generated regardless of the external power source. In addition, the conventional BLDC motor has a high torque and miniaturization due to the development of high pressure insulator, improved performance of ferrite magnet, and high performance rare earth magnet, resulting in high torque and miniaturization. Heat dissipation has superior cooling characteristics compared to other motors.

The configuration of the conventional BLDC motor is composed of a stator, a rotor, a shaft system, a sensor magnet and a sensor circuit (PCB). The BLDC motor is configured to be mounted in synchronization with the rotor by mounting a sensor magnet on the shaft system of the motor, while fixing the sensor circuit to an enclosure or a stator to detect a change in the magnetic force of the sensor magnet to determine the position of the rotor. According to the conventional three-phase BLDC motor described above, the same number of poles of the sensor magnet is also used according to the number of poles used in the motor, and one sensor of the sensor circuit is also required for each phase. do. In addition, the coils of each phase of the stator and the sensors of each phase of the sensor circuit must be aligned at a predetermined fixed position.

However, the configuration of the sensor magnet and the sensor circuit of the conventional BLDC motor is mounted separately, so it is difficult to install and structurally difficult in aligning the position of the sensor corresponding to each phase of the sensor circuit and the coil of the stator phase. many. Therefore, there is a problem that takes a lot of time and effort in mounting the sensor magnet and sensor circuit of the three-phase BLDC motor.

Accordingly, an object of the present invention is to provide a sensor device of a BLDC motor in which a sensor magnet and a sensor circuit for detecting the rotor position of the BLDC motor are integrated.

A sensor device of a BLDC motor according to an embodiment of the present invention includes an upper cover, a shaft rotating unit, a lower cover, and a sensor circuit. Here, the upper cover is formed with a hole in the center, the shaft rotation portion is disposed through the hole, the lower cover is coupled to the upper cover. The sensor circuit is disposed between the upper cover and the lower cover and is spaced apart from the end of the shaft rotation part at a predetermined interval. Here, the shaft system rotating part is a body portion disposed through the hole, the sensor circuit is spaced apart from the sensor circuit at a predetermined distance from the end of the body and disposed inside the upper cover to rotate in accordance with the rotation of the body portion and the sensor magnet holder Disclosed is a configuration that includes.

The sensor circuit of the present invention may include a sensor for sensing the sensor magnet, a circuit board on which the sensor is disposed, and a signal line extracting part connected to the circuit board to extract magnetic force information of the sensor magnet. Each part of the magnet included in the sensor magnet may have a number corresponding to the number.

In addition, the upper cover of the present invention includes a lower cover facing portion having a ring shape is formed outwardly from the open outer circumferential surface of the cylinder, the ceiling is closed, the lower cover is a cylinder with a bottom closed, the outer peripheral surface of the cylinder In the outward direction is formed to include an upper cover facing portion having a ring shape, the upper cover facing portion may be formed having a size smaller than the outer peripheral surface of the lower cover facing portion. At least one of one side of the lower cover facing portion and one side of the upper cover facing portion may be removed to expose the sensor circuit.

In addition, the sensor device of the BLDC motor of the present invention may further include a fastening structure for fastening the lower cover and the upper cover through the lower cover facing portion and the upper cover facing portion.

According to the sensor device of the BLDC motor of the present invention, the present invention can be mounted in a form in which the sensor magnet and the sensor circuit are integrated, so that the sensor magnet and the sensor circuit can be mounted at one time in assembling the sensor device of the BLDC motor. As a result, unnecessary work time for matching the sensor magnet and the sensor circuit can be reduced.

According to the sensor device of the BLDC motor of the present invention, the present invention can facilitate the operation for mounting the sensor device by providing a clip on the sensor device mounted to the BLDC motor, it is possible to maintain a more stable mounting state after mounting. .

In addition, according to the sensor device of the BLDC motor of the present invention, the present invention is developed by integrating the sensor magnet and the sensor circuit is very easy to mount on a three-phase BLDC motor, the position of the sensor circuit is easy to move the alignment with the stator winding winding Very convenient.

In addition, according to the sensor device of the BLDC motor of the present invention, the present invention can be manufactured for the number of poles of various combinations, and is made independently of the three-phase BLDC motor, so that it is not limited to a specific motor and can be used for 120 degree driving. As it can be used universally for BLDC motor, independent commercialization is possible.

1 is a cross-sectional view showing a cross section of a sensor device of a BLDC motor according to an embodiment of the present invention;
2 is a view illustrating in more detail a sensor magnet and a sensor magnet holder of a BLDC motor according to an embodiment of the present invention;
3 is a view showing in more detail the form of a sensor circuit according to an embodiment of the present invention;
4 is a rear view of the sensor device of the BLDC motor according to an embodiment of the present invention;
5 is a cross-sectional view showing a cross section of a sensor device of a BLDC motor according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation according to the embodiment of the present invention will be described, and the description of other parts will be omitted so as not to disturb the gist of the present invention.

The terms or words used in the specification and claims described below should not be construed as being limited to the ordinary or dictionary meanings, and the inventors are appropriate to the concept of terms in order to explain their invention in the best way. It should be interpreted as meanings and concepts in accordance with the technical spirit of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention, and various equivalents may be substituted for them at the time of the present application. It should be understood that there may be water and variations.

1 is a schematic cross-sectional view of a sensor device of a BLDC motor according to an exemplary embodiment of the present invention, FIG. 2 is a view illustrating a sensor magnet holder and a sensor magnet in more detail, and FIG. 3 is a view illustrating a sensor circuit of the present invention. 4 is a detailed view illustrating a rear view of the sensor device of the BLDC motor according to the present invention.

Referring to FIG. 1, the sensor device 10 of the BLDC motor of the present invention includes a shaft rotating unit 100 including a sensor magnet 110, an upper cover 200 surrounding the shaft rotating unit 100, and an upper portion thereof. It may include a lower cover 300 which is engaged with the cover 200, the sensor circuit 400 for sensing the sensor magnet 110 provided in the shaft rotation unit 100.

Sensor device 10 of the BLDC motor of the present invention having such a structure is disposed through the hole 210 provided in the center of the upper cover 200, the shaft system rotating unit 100 is disposed, the upper cover of the shaft system rotating unit 100 The sensor magnet 110 positioned inside the 200 is disposed to face the sensor circuit 400 spaced apart from the sensor circuit 400 disposed in an area where the upper cover 200 and the lower cover 300 are engaged with each other. The sensor device 10 of the BLDC motor has the shaft cover 100 mounted on the upper cover 200 and the sensor circuit 400 disposed on the lower end of the upper cover 200. By assembling with 200, the assembly of the sensor device 10 of the BLDC motor can be completed in a simple process. In addition, since the sensor magnet 110 and the sensor circuit 400 are disposed to face each other in this process, a separate operation for the alignment of the sensor magnet 110 and the sensor circuit 400 is unnecessary. Hereinafter, each configuration will be described in detail.

The upper cover 200 may be manufactured in a form that can be assembled to face the hole 210 and the edge area of the lower cover 300, the shaft rotation unit 100 may be disposed in the center. The upper cover 200 is manufactured in a cylindrical shape in which the ceiling 201 is closed as a whole, and a hole 210 may be provided in the center of the ceiling 201, and may be disposed at an opened portion of the cylinder 220. In the circumference, a lower cover facing portion 230 having a predetermined length in the outward direction from the center of the cylinder 220 may be provided. Here, the bearing 240 is provided in the peripheral area of the hole 210 to be provided in the ceiling 201 of the upper cover 200 to facilitate the rotation of the shaft rotation part 100 after the shaft rotation part 100 is disposed. Can be. That is, the bearing 240 serves to smoothly support the rotation while the shaft rotation unit 100 rotates in a predetermined direction. On the other hand, the lower cover facing portion 230 is provided around the open circumference of the cylinder 220, wherein the lower cover stool portion 230 in the circumferential region of a portion so that the additional structure of the sensor circuit 400 can be disposed May be limited in the stretched region. That is, the lower cover facing portion 230 is formed as an annular ring according to the open circumference of the cylinder 220, it may be formed so that certain portions are disconnected without being connected to each other. In addition, one side of the lower cover facing portion 230 may be provided with a plurality of assembly holes for assembly with the lower cover 300. The lower cover facing portion 230 may be formed to have the same size as the overall edge size of the lower cover 300 or may be formed larger than the overall edge size of the lower cover 300. When the lower cover facing portion 230 is formed larger than the entire edge area of the lower cover 300, the lower cover in the edge region of the lower cover facing portion 230 to facilitate assembly with the lower cover 300. A protrusion area having a predetermined height in the direction in which the 300 is assembled may be provided. The protruding region serves to guide the lower cover 300 to be easily seated on the lower cover facing portion 230 while the lower cover 300 is assembled to the upper cover 200, and the lower cover 300 is assembled thereafter. It may serve to prevent the flow of the cover 300.

The shaft rotating part 100 is disposed at a body portion 130 disposed in the hole 210 provided in the upper cover 200, and an end portion of the body portion 130 provided inside the upper cover 200. The sensor magnet 110 and the sensor magnet holder 120 may be included. In this shaft system rotating unit 100, the body portion 130 may be formed in a through or protruding shape, it may be connected to the shaft system of the BLDC motor. That is, when the BLDC motor (not shown) is formed in the protruding shape, the body part 130 may be provided in a through type, and when the BLDC motor is formed in the through type, the body part 130 may be formed in a protruding shape. Can be. Some outer walls of the upper end of the body portion 130 is in contact with the bearing 240 provided on the upper cover 200. Accordingly, when the BLDC motor rotates, the body portion 130 is rotated in a predetermined direction while being in contact with the bearing 240 by the rotational force being transmitted to the body portion 130. Meanwhile, a sensor magnet holder 120 is provided at the bottom of the body 130. Hereinafter, the sensor magnet holder 120 and the sensor magnet 110 will be described in more detail with reference to FIG. 2.

1 and 2, the sensor magnet holder 120 may include an insertion hole 121 into which the body 130 may be inserted and fixed, and a seating portion into which the sensor magnet 110 may be disposed. 123 may be included. The seating part 123 may be provided with a partition wall 125 disposed at a predetermined interval so that each sensor magnet part may be disposed at a predetermined interval according to the number of the sensor magnets 110. Here, the shape of the seating portion 123 partitioned into a predetermined space by the dividing wall 125 may be manufactured in the same form as that of the sensor magnet parts so that the sensor magnet 110 may be mounted. The sensor magnet holder 120 is rotated in accordance with the rotation of the body portion 130.

The sensor magnet 110 is seated on the seating portion 123 by a predetermined size by partitions 125 that partition the space of the seating portion 123 and the seating portion 123 provided in the sensor magnet holder 120. Can be. The sensor magnet 110 is in a fixed state by the sensor magnet holder 120, and when the sensor magnet holder 120 rotates together with the body portion 130 is rotated in synchronization.

Meanwhile, referring to FIGS. 1 and 3, the sensor circuit 400 has an edge region disposed between and fixed to the edge of the lower cover facing portion 230 and the lower cover 300 of the upper cover 200. . The sensor circuit 400 may include a circuit board 420, a sensor 410 formed on the circuit board 420, and a signal line extracting part connected to the circuit board 420 to extract the detected magnetic force to the outside ( 430). The sensor circuit 400 is formed in a shape corresponding to the sensor magnet 110 for detecting a magnetic force of the sensor magnet 110, for example, in an annular shape, and corresponds to each of the sensor magnet parts on a predetermined surface formed in the annular shape. Sensors 410 may be disposed. Accordingly, when the sensor magnet 110 rotates, the sensor 410 provided in the sensor circuit 400 detects a magnetic force due to the rotation of the sensor magnet 110 and transmits the magnetic force to the circuit board 420. Then, the signal line extracting unit 430 connected to the circuit board 420 may transmit the collected magnetic force information to the outside.

1 to 4, the lower cover 300 is formed in a cylindrical shape in which the bottom 301 is closed to a position facing the upper cover 200, and has a predetermined width in the outer direction from the circumference of the cylinder. It may include an upper cover facing portion 310 extending perpendicular to the cylinder. Here, the upper cover facing portion 310 is configured to face the lower cover facing portion 230 of the upper cover 200. The upper cover facing portion 310 may be provided with a plurality of assembly holes 320 similar to the lower cover facing portion 230. In addition, the sensor device 10 of the BLDC motor of the present invention passes through the assembly holes 320 provided in the lower cover facing portion 230 and the upper cover facing portion 310 to cover the lower cover 300 and the upper cover 200. It may further include a piece 330 for fixing. Here, the shape of the piece 330 may vary depending on the shape of the assembly hole 320. That is, when the inner wall of the assembly hole 320 formed in the upper cover 200 and the lower cover 300 is provided in the form of a screw thread, the piece 330 may have a screw thread and a screw coupling provided in the assembly hole 320. It can have a form. In addition, when the inner wall of the assembly hole 320 does not have a separate bending, the piece 330 passes through the assembly hole 320 and then the lower cover facing portion 230 and the upper cover facing portion 310 by a constant pressure. It may be formed of a material that can be in close contact with the outer surface of the). In addition, the piece 330 may be a nut having a screw thread formed only at the end and a nut for screwing the end through the assembly hole 320. As such, the assembly hole 320 and the piece 330 may be a fastening structure for fastening the lower cover 300 and the upper cover 200.

In addition, the upper cover facing portion 310 may not be partially formed at one side of the lower cover 300. That is, the upper cover facing part 310 is not formed at a position parallel to an area of the upper cover 200 in which the lower cover facing part 230 is not formed among one side of the lower cover 300. Accordingly, the sensor circuit 400 is formed by an annular lower cover facing portion 230 and the cover facing portion 310 which are not partially connected to one side of the lower cover 300 and one side of the upper cover 200. ) May be exposed, and a signal line extracting part 430 may be disposed on one side of the exposed sensor circuit 400.

Meanwhile, a predetermined step may be provided on the inner surface of the lower cover 300 that faces the upper cover facing portion 310 in consideration of the arrangement of the sensor circuit 400. In addition, a stepped portion may be provided on the inner surface of the lower cover facing portion 230 of the upper cover 200. The height of the grooves generated by the stepped portions of the upper cover facing portion 310 and the lower cover facing portion 230 being engaged with each other is such that the circuit board 420 of the sensor circuit 400 can be firmly fixed. It is preferable that it is equal to or less than the height of the circuit board 420. The steps may be omitted according to the intention of the designer to design the sensor device 10 of the BLDC motor. And the circumference of the upper cover facing portion 310 may be formed smaller than the circumference of the lower cover facing portion 230, so that the outer circumferential surface of the upper cover facing portion 310 is the lower cover facing portion 230 It may be in contact with the side wall of the protruding region provided in the.

5 is a cross-sectional view showing a cross section of the sensor device 10 of the BLDC motor according to another embodiment of the present invention.

Referring to FIG. 5, the sensor device 10 of the BLDC motor according to another embodiment of the present invention includes a shaft rotating unit 100, an upper cover 200, a lower cover 300, a sensor circuit 400, and a clip ( 500). Here, the sensor device 10 of the BLDC motor according to another embodiment of the present invention has the same configuration as the sensor device 10 of the BLDC motor described in FIGS. 1 to 4 except for the clip 500. Detailed description of the other components except for the clip 500 will be omitted.

Sensor device 10 of the BLDC motor according to another embodiment of the present invention having such a structure is disposed through the hole 210 provided in the center of the upper cover 200, the shaft system rotating unit 100 is disposed, the shaft system rotating unit ( The sensor magnet 110 positioned inside the upper cover 200 is disposed to face the sensor circuit 400 disposed in an area where the upper cover 200 and the lower cover 300 are engaged with each other. In particular, the clip 500 may be disposed at one side of the upper cover 200. The sensor device 10 of the BLDC motor has the shaft cover 100 mounted on the upper cover 200 and the sensor circuit 400 disposed on the lower end of the upper cover 200. By assembling with 200, the assembly of the sensor device 10 of the BLDC motor can be completed in a simple process. And the sensor device 10 of the BLDC motor of the present invention can be firmly fastened to the BLDC motor (not shown) using the clip 500. The clip 500 is fastened to a structure that can be coupled to the clip 500 provided on one side of the BLDC motor to support the sensor device 10 of the BLDC motor to be firmly fixed to the BLDC motor.

Meanwhile, in the sensor device 10 of the BLDC motor according to another embodiment of the present invention, the clip device structure is fixed to fix the sensor device 10 to the BLDC motor. However, the present invention is not limited thereto. . That is, the clip 500 of the present invention may be various coupling structures that can fix the sensor device 10 of the BLDC motor to the BLDC motor, for example, in the form of a clip different from that shown in FIG. Could be made.

In addition, in the above description, one side of the lower cover facing portion 230 formed on the upper cover 200 having an annular shape and the upper cover facing portion 310 formed on the lower cover 300 has been removed. This is not limited to this. That is, the sensor device 10 of the BLDC motor of the present invention may be designed to have a form in which only one side of the lower cover facing portion 230 is removed or only one side of the upper cover facing portion 310 is removed. .

As described above, the sensor device 10 of the BLDC motor according to the embodiment of the present invention is provided between the lower cover facing portion 230 and the upper cover facing portion 310 provided in the upper cover 200 and the lower cover 300. While arranging the sensor circuit 400, the sensor magnet 110 may be disposed at the lower end of the shaft rotation unit 100 disposed on the upper cover 200, but may be disposed to face the sensor circuit 400. to provide. Accordingly, the sensor device 10 of the BLDC motor of the present invention performs a process for assembling the sensor device 10 without performing an operation for separately aligning the sensor magnet 110 and the sensor circuit 400. 110 and sensor circuit 400 can be aligned. Meanwhile, when the rotational force of the motor is transmitted from the BLDC motor connected to the shaft rotating unit 100, the shaft rotating unit 100 rotates, and the sensor magnet 110 included in the shaft rotating unit 100 is rotated. The magnetic force change may be generated by rotating in synchronization with the body 130 of the rotating part 100. In this process, the sensor circuit 400 faces the sensor magnet 110 to detect a change in magnetic force due to the movement of the sensor magnet 110, and then the signal line extracting unit 430 disposed on one side of the sensor circuit 400. ) To sense the change of magnetic force of BLDC motor by transmitting to outside.

In addition, the sensor device 10 of the BLDC motor according to an embodiment of the present invention is provided with a clip 500 on one side of the upper cover 200, the clip 500 is coupled to one side of the BLDC motor to the sensor device 10 By attaching to the BLDC motor, it is possible to support easier magnetic force detection of the sensor magnet 110.

The present invention determines the rotor position of the three-phase BLDC motor to support the easy mounting of the sensor magnet and the sensor circuit to facilitate the 120-degree switching switching operation operation.

In addition, the conventional sensor device for a three-phase BLDC motor is composed of a sensor magnet and a sensor circuit separately, it is difficult to align the mounting and stator coils, and limited to the specific motor use, but the sensor device of the BLDC motor of the present invention ( 10) is developed by integrating the sensor magnet 110 and the sensor circuit 400 is very easy to be mounted on a three-phase BLDC motor, and the position of the sensor circuit 400 is easy to move and alignment with the stator winding winding is very easy.

In addition, the sensor device 10 of the BLDC motor of the present invention can be manufactured for the number of poles of various combinations and is made independently of the three-phase BLDC motor, so that it is not limited to a specific motor and can be used for a 120-degree BLDC motor. It can be used as a standalone product because it can be used universally in motors.

On the other hand, although not shown, the BLDC motor of the present invention is a BLDC motor, an inverter for receiving a predetermined DC voltage to supply a three-phase (A / B / C) voltage (Va / Vb / Vc) to the BLDC motor, The sensor device 10 of the BLDC motor as described above for detecting the rotor position of the BLDC motor driven by receiving the three-phase voltage Va / Vb / Vc supplied from the inverter, and the sensor device 10 And a microcomputer for controlling the inverter to be driven by outputting an inverter driving signal by detecting that the rotor position signal sensed by the zero phase is intersected.

While the present invention has been described with reference to several preferred embodiments, these embodiments are illustrative and not restrictive. It will be understood by those of ordinary skill in the art that various changes and modifications may be made without departing from the spirit of the invention and the scope of the appended claims.

10: sensor device of BLDC motor 100: shaft system rotating part
130: body portion 110: sensor magnet
120: sensor magnet holder 200: top cover
210: hole 240: bearing
220: cylinder 230: lower cover facing portion
300: lower cover 310: upper cover facing portion
400: sensor circuit 410: sensor
420: circuit board 430: signal line lead-out
500: Clip

Claims

An upper cover formed with a hole in the center;
An axis system rotating part disposed through the hole;
A lower cover coupled to the upper cover;
And a sensor circuit disposed between the upper cover and the lower cover and spaced apart from the end of the shaft rotation part at a predetermined interval.
The shaft rotating unit
A body portion disposed through the hole;
And a sensor magnet and a sensor magnet holder spaced apart from the sensor circuit at an end of the body part and disposed in the upper cover to rotate according to the rotation of the body part.
The sensor circuit
A sensor for sensing the sensor magnet;
A circuit board on which the sensor is disposed;
A signal line extracting part connected to the circuit board to extract magnetic force information of the sensor magnet;
Sensor device of the BLDC electric motor comprising a.

delete

The method of claim 1,
The sensor
The sensor device of the BLDC motor, characterized in that each part of the magnet included in the sensor magnet has a number corresponding to the number.

An upper cover formed with a hole in the center;
An axis system rotating part disposed through the hole;
A lower cover coupled to the upper cover;
And a sensor circuit disposed between the upper cover and the lower cover and spaced apart from the end of the shaft rotation part at a predetermined interval.
The shaft rotating unit
A body portion disposed through the hole;
And a sensor magnet and a sensor magnet holder spaced apart from the sensor circuit at an end of the body part and disposed in the upper cover to rotate according to the rotation of the body part.
The top cover is
Cylinder with closed ceiling;
A lower cover facing portion formed outward from the opened outer circumferential surface of the cylinder and having an annular shape;
Sensor device of the BLDC electric motor comprising a.

The method of claim 4, wherein
The lower cover is
Cylinder with closed bottom;
And an upper cover facing portion formed outward from the opened outer circumferential surface of the cylinder and having an annular shape.
The upper cover facing portion has a size smaller than the outer peripheral surface of the lower cover facing portion is formed sensor device of the BLDC motor.

The method of claim 5,
A fastening structure for fastening the lower cover and the upper cover through the lower cover facing portion and the upper cover facing portion;
Sensor device of the BLDC electric motor further comprising.

The method according to any one of claims 4 to 6,
One side of the lower cover facing portion is removed to expose the sensor circuit,
One side of the upper cover facing portion is removed to expose the sensor circuit,
And the lower cover facing portion and one side of the lower cover facing portion are removed to expose the sensor circuit.

An upper cover formed with a hole in the center;
An axis system rotating part disposed through the hole;
A lower cover coupled to the upper cover;
A sensor circuit disposed between the upper cover and the lower cover and spaced apart from the end of the shaft rotation part at a predetermined interval;
A clip provided on one side of the upper cover to attach the BLDC motor to the sensor device;
The shaft rotation unit
A body portion disposed through the hole;
A sensor magnet and a sensor magnet holder spaced apart from the sensor circuit at an end of the body part and disposed in the upper cover to rotate according to rotation of the body part;
Sensor device of the BLDC electric motor comprising a.

An upper cover formed with a hole in the center;
An axis system rotating part disposed through the hole;
A lower cover coupled to the upper cover;
A sensor circuit disposed between the upper cover and the lower cover and spaced apart from the end of the shaft rotation part at a predetermined interval;
And a bearing disposed in an area around the upper cover hole to support rotation of the body part.
The shaft rotating unit
The body portion disposed through the hole;
A sensor magnet and a sensor magnet holder spaced apart from the sensor circuit at an end of the body part and disposed in the upper cover to rotate according to rotation of the body part;
Sensor device of the BLDC electric motor comprising a.