KR100895006B1 - Bldc motor with separation type cover - Google Patents

Abstract

A BLDC motor with a separable cover is provided to improve the reliability and quality of the BLDC motor by easily controlling minute gap between a hall sensor and a magnet. A BLDC motor with a separable cover comprises a casing(100), a stator(200), a rotor(300), a magnet(350), a printed circuit board(400), a casing cover(500), a rotary cover(600) and a packing. The casing has an opened one end and a hollow cylindrical shape. A coil is wound with a stator being fixed to the casing inner circumference. A rotor is rotatably installed at the stator inner side and is equipped with a magnet. In the printed circuit board, a hall sensor(450) sensing the magnetic force of the magnet and detecting the location of the rotor is adhered. The casing cover has a through-hole in center and is coupled in the one end of the casing. An annular protrusion(620) is inserted into the through-hole of the casing cover and fixes the printed circuit board.

Description

BLDC MOTOR WITH SEPARATION TYPE COVER}

The present invention relates to a BLDC (BLDC) motor, and more particularly, even when the current phase angle adjustment or fine spacing between the magnet and the Hall sensor is required to secure the optimum output characteristics of the motor, The present invention relates to a BLC motor having a detachable cover that can easily adjust phase angle without reassembly to improve reliability and quality.

In general, a motor is a device that obtains rotational force by converting electrical energy into mechanical energy, and is widely used not only in home appliances but also in industrial equipment.

Among such motors, BLDC motors are equipped with armature windings in the field and stator in the rotor, and determine the current direction of the windings using a hall sensor, usually a photo diode. This is a motor that has the same characteristics as a brush-type motor.

Unlike general induction motors or AC motors that use three-phase or four-phase inverters to change the direction of current, BCD motors can be easily switched in the internal drive, relatively high torque at low and high speeds, and high speed rotation. This is possible. In addition, the BCD motor is a solid-state semiconductor device capable of driving the current of the coil, so it has a very long lifespan, generates little noise and electronic noise, and can be directly controlled by the motor drive circuit itself. It has advantages In particular, the BCD motor is being developed in a variety of forms in recent years as the reliability of the Hall sensor is improved.

A general BCD motor as described above will be described with reference to the accompanying drawings.

1 is an exploded perspective view of a general BCD motor, FIG. 2 is a plan view of main parts of a general BCD motor, and FIG. 3 is a perspective view illustrating a casing cover of the BCD motor of the embodiment of FIG. 1.

As shown in FIGS. 1 and 2, a general BCD motor has a large rotating part and a fixed part, the rotating part includes a rotor 30 and a magnet 35, and the fixed part has a casing 10 and a stator 20. And a printed circuit board 40 and a casing cover 50 to which the hall sensor 45 is attached.

That is, a general BCD motor is fixed to the inner circumferential surface of the casing 10 and at the same time, the rotor 22 is wound around the coil 22, and the rotor 35 is fixed to the outer circumferential surface and the rotor is installed inside the stator 20 and rotates. 30, a printed circuit board 40 to which the hall sensor 45 sensing the magnetic force of the magnet 35 is attached, and a casing cover 50 coupled to the casing 10. FIG. 1 illustrates a magnet-attached BCD motor having a magnet 35 attached to an outer circumferential surface of the rotor 30, or a magnet embedded BCD motor having a magnet 35 embedded in the rotor 30. have. In addition, the BCD motor includes a washer 34, a bearing 38, and the like installed on the other rotating shaft 32.

As shown in FIG. 2, the stator 20 is formed by stacking a plurality of thin silicon steel sheets, and a plurality of teeth 24 are provided at regular intervals along the inner circumferential surface, and together with the teeth 24. An insulator 28 is provided to insulate the slot 26 formed by the tooth 24 from the coil 22, and the rotor 30 is rotatably provided with a space therein.

The rotor 30 is formed in a columnar shape by laminating a plurality of silicon steel sheets similarly to the stator 20, and the rotating shaft 32 is fixed through the center and is generated from the coil 22 wound on the stator 20. A magnet 35 generating torque by interaction with a magnetic field is fixed at regular intervals along the outer circumferential surface of the rotor 30.

The hall sensor 45 detects the position of the rotor 30 by sensing the magnetic force of the magnet 35 and is attached to the printed circuit board 40 provided on the casing cover 50 side.

That is, in the general BCD motor as described above, the Hall sensor 45 senses the magnetic pole position of the magnet 35 installed in the rotor 30, and the stator 20 is adapted to the magnetic pole arrangement of the magnet according to the sensed value. The winding coil 22 flows a current in a specific direction. Therefore, the magnetic force of the polarity corresponding to the direction of the current flow is generated in the coil 22 of the stator 20, the magnetic force generated in the coil 22 of the stator 20 and the stator 20 due to the magnetic pole of the magnet 35 Induction current is generated between the rotor 30 and the rotor 30 is rotated.

As shown in FIG. 3, such a general BCD motor has a printed circuit board 40 having a hall sensor 45 for detecting a position of the rotor 30 every 120 degrees in an electric angle for smooth switch timing of electric current. There is. The hall sensor 45 outputs a signal in the form of a square wave or a sinusoidal wave according to a change in magnetic flux detected from the outside, and sequentially controls the current input to each phase. In general, the input current timing of each phase of the BCD motor is configured to allow 120 degree electric current to be applied in the same phase as the counter electromotive force of the corresponding phase, and if the phase of the hall sensor 45 is properly adjusted within a given range, It is possible to improve output characteristics such as maximum output and torque ripple reduction without change.

However, the casing cover 50 of the general BCD motor shown in FIG. 3 is merely coupled to the casing 10 shown in FIG. 1 by fixing the printed circuit board 40 to which the hall sensor 45 is attached. Therefore, in order to adjust the switch timing of the current to secure the optimum output characteristics of the motor under such a structure, the position of the printed circuit board 40 with the hall sensor 45 installed therein must be adjusted by removing the casing of the motor every time the measurement is performed. There is a hassle to do.

As described above, the general BCD motor has a problem in that the position of the printed circuit board must be adjusted by separating the casing cover from the casing of the motor in order to adjust the switch timing to secure the optimum output characteristics of the motor.

In addition, when using a multi-pole sensing magnet such as a precision control motor, fine adjustment of the distance between the hall sensor and the magnet is required, and when adjustment is required due to manufacturing and assembly tolerances of parts, the work is performed by repeated reassembly. There is a problem of increased airborne.

In addition, damage to a bearing or a rotating shaft that occurs in the reassembly process due to the series of adjustments as described above, there is a problem that leads to the vibration and sound of the BCD motor, thereby reducing the reliability and quality.

An object of the present invention devised to solve the above problems, it is possible to simply adjust the phase angle without separating and reassembling the BLC motor when the current phase angle adjustment is required to ensure the optimum output characteristics of the motor The present invention provides a BCD motor having a detachable cover.

In addition, it is possible to easily adjust the spacing even when fine spacing between the magnet and the hall sensor is required, thereby providing a BCD motor with a detachable cover that can improve the reliability and quality of the BCD motor. .

Other objects, specific advantages and novel features of the invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings.

In order to achieve the above object, a BCD motor having a detachable cover according to the present invention includes a casing having an open end, a hollow cylindrical shape, a stator with a coil wound while being fixed to the inner circumferential surface of the casing, and A printed circuit board rotatably installed inside the stator, and equipped with a rotor provided with a magnet, a hall sensor sensing the magnetic force of the magnet to detect the position of the rotor, and a through hole in the center of the casing. A casing cover coupled to one end and an annular protrusion inserted into the through hole of the casing cover to fix the printed circuit board, and rotatably coupled to the casing cover to close the through hole of the casing cover. It is made to include a rotating cover.

In addition, the casing cover and the rotary cover is characterized in that it further comprises a packing closely installed.

In addition, the rotating cover, a plurality of slots are formed in an annular shape to the outside of the protrusion is bolted to the casing cover through each of the plurality of slots, it characterized in that it can rotate by the length of the plurality of slots .

In addition, the rotary cover, characterized in that it further comprises a projection protruding to the opposite side of the projection.

In the BCD motor having the detachable cover according to the present invention, even when the casing cover and the rotating cover are separated and the current phase angle adjustment is required to secure the optimum output characteristics of the motor or the fine spacing between the magnet and the hall sensor is required The phase angle can be adjusted simply by rotating the rotating cover without removing and reassembling the DC motor.

In addition, the casing cover and the rotary cover can be firmly coupled through the packing, and can be easily engaged and released by bolting.

In addition, the rotation angle can be known through the scale from the initial coupling position of the rotation cover through the scale to quantitatively adjust the phase angle.

In addition, by forming a projection on the rotary cover it is possible to easily rotate the rotary cover.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the BCD motor having a detachable cover according to the present invention.

Figure 4 is an exploded perspective view showing an embodiment of the BCD motor with a detachable cover of the present invention, Figure 5 is a casing cover according to a first embodiment of the BCD motor with a detachable cover of the present invention, rotation 6 is a perspective view illustrating a cover and a printed circuit board, and FIG. 6 is a perspective view illustrating a casing cover, a rotating cover, a packing, and a printed circuit board according to a second embodiment of a BCD motor having a detachable cover of the present invention. 7 is a perspective view illustrating a rotating cover according to a third embodiment of a BCD motor having a detachable cover of the present invention, and FIGS. 8 to 10 are bottom views illustrating an operation process of the rotating cover of the embodiment of FIG. 4. It is also.

The BCD motor having a detachable cover according to the present invention includes a casing 100, a stator 200, a rotor 300, a magnet 350, a printed circuit board 400, a casing cover 500, and a rotating cover 600. ) And packing 700. In addition, a Hall sensor 450 is attached to the printed circuit board 400, a through hole 550 is formed in the casing cover 500, and the rotation cover 600 includes a protrusion 620 and a slot ( 640 and the protrusion 660 may be formed, and a scale (not shown) may be drawn in the rotation area.

As shown in FIG. 4, the casing 100 is an external appearance of a BCD motor, and includes various components to be described later. The casing 100 of the BCD motor is generally cylindrical in view of the radius of rotation of the rotating portion rotating therein. Therefore, one end of the casing 100 of the present invention is open and has a hollow cylindrical shape. The exterior of the casing 100 may be deformed accordingly, and a bracket or a rib may be coupled to the casing 100 in order to connect the BCD motor to an installation position or other components.

The stator 200 is fixed to the inner circumferential surface of the casing 100 and at the same time a coil is wound. The stator 200 is formed by stacking a plurality of thin silicon steel sheets as shown in FIG. 2 showing a conventional BCD motor, and a plurality of teeth 24 are provided at regular intervals along an inner circumferential surface thereof. An insulator 28 is installed to insulate the slot 26 formed by the tooth 24 together with the coil 24 from the coil 22.

The rotor 300 is a rotating part of the BCD motor, is rotatably installed inside the stator 200, and has a magnet 350. The magnet 350 may be attached along the outer circumferential surface of the rotor 300 as shown in FIG. 4, or may be embedded in the rotor 300. That is, it is sufficient if the rotor 300 includes the magnet 350, whether the magnet is attached or the magnet embedded type. In addition, the rotor 300 is formed in a circumferential shape by stacking a plurality of silicon steel sheets, similar to the stator 200, and a rotating shaft 320 penetrates and is fixed at the center thereof, and a magnetic field generated from a coil wound on the stator 200. A magnet 350 is provided for generating torque by interaction with it.

The printed circuit board 400 is attached with a hall sensor 450 that detects the position of the rotor 300 by sensing the magnetic force of the magnet 350. As shown in FIGS. 4 and 5, the hall sensor 450 mounted on the printed circuit board 400 is positioned at an electric angle every 120 degrees for smooth switch timing of current. The hall sensor 450 outputs a signal in the form of a square wave or a sinusoidal wave according to a change in magnetic flux detected from the outside, and sequentially controls the current input to each phase. In general, the input current timing of each phase of the BCD motor is configured to allow 120 degree electric current to be applied in the same phase as the counter electromotive force of the corresponding phase, and if the phase of the hall sensor 450 is properly adjusted within a given range, It is possible to improve output characteristics such as maximum output and torque ripple reduction without change.

The casing cover 500 is for closing the opened end of the casing 100, and has a through hole in the center as shown in FIGS. 4 and 5, and is coupled to one end of the casing 100.

The rotary cover 600 is for closing the through hole 550 of the casing 100 and fixing the printed circuit board 400 to which the hall sensor 450 is attached. Accordingly, the rotary cover 600 is inserted into the through hole of the casing cover 100 to form an annular protrusion 620 for fixing the printed circuit board 400. The protrusion 620 of the rotary cover 600 may fix the printed circuit board 400 by bolt coupling. In addition, the rotary cover 600 is rotatably coupled to the casing cover 100 so as to close the through hole 550 of the casing cover 100. That is, since the protrusion 620 formed on the rotary cover 600 is coupled to the printed circuit board 400, and the rotary cover 600 is rotatably coupled to the casing cover 100, the rotation cover 600 is rotated. Accordingly, the printed circuit board 400 also rotates together. In addition, the Hall sensor 450 attached to the printed circuit board 400 also rotates together with the rotation cover 600. Accordingly, the phase of the hall sensor 450 can be properly adjusted by rotating the rotary cover 600.

As shown in FIG. 5, the rotary cover 600 may be formed in an annular shape with a plurality of slots 640 to the outside of the protrusion 620. In addition, the rotation cover 600 is bolted to the casing cover 500 through each of the plurality of slots 640, as shown in Figures 8 to 10, the length of the plurality of slots 640 Can rotate As shown in FIGS. 8 to 10, four slots 640 may be formed, and three or five slots 640 may be formed, but a plurality of slots 640 may be provided for stable coupling of the rotary cover 600. 640 are each preferably arranged at radial equal intervals.

The bolt can be easily loosened and tightened by the bolt coupling between the rotary cover 600 and the casing cover 500. When the rotary cover 600 needs to be rotated, the bolt is released and rotated. Tighten the bolts to secure them. In order to more firmly couple the rotary cover 600 and the casing cover 500, the packing 700 is installed as shown in FIG. That is, the packing 700 is installed closely between the casing cover 500 and the rotary cover 600. The packing 700 may be of various kinds such as silicon, asbestos, synthetic resin, etc., but the present invention firmly couples the casing cover 500 and the rotary cover 600 using a rubber packing that can be easily obtained.

As shown in FIG. 7, the rotary cover 600 may further include a protrusion 660 protruding to the opposite side of the protrusion 620, and the protrusion 660 may rotate when the rotary cover 600 is rotated. It serves to handle the user to rotate the rotary cover 600 more easily. In addition, the rotary cover 600 may be displayed a scale from the initial position coupled to the casing cover 500 to the rotation region, thereby quantitatively recognizing how much the user rotated the rotary cover 600. It can be used more conveniently.

Other components that are not described among the components shown in FIG. 4 include a rotating shaft 320 supporting a center of rotation of the rotor 300, and washers 340 and bearings 380 provided at both ends of the rotating shaft 320. . Since the rotating shaft 320, the washer 340 and the bearing 380 are the same as in the prior art, a detailed description thereof will be omitted.

The embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

1 is an exploded perspective view of a general BCD motor,

2 is a plan view of main parts of a general BCD motor;

3 is a perspective view illustrating a casing cover and a printed circuit board of the BCD motor of the embodiment of FIG. 1;

Figure 4 is an exploded perspective view showing an embodiment of the BCD motor with a detachable cover of the present invention,

FIG. 5 is a perspective view illustrating a casing cover, a rotating cover, and a printed circuit board according to a first embodiment of a BD motor having a detachable cover of the present invention; FIG.

6 is a perspective view illustrating a casing cover, a rotating cover, a packing, and a printed circuit board according to a second embodiment of a BCD motor having a detachable cover of the present invention;

7 is a perspective view showing a rotating cover according to a third embodiment of a BCD motor having a detachable cover of the present invention;

8 to 10 is a bottom view showing the operation of the rotary cover of the embodiment of FIG.

<Explanation of symbols for main parts of the drawings>

100 casing

200: Stator

300: rotor 350: magnet

400: printed circuit board 450: Hall sensor

500: casing cover 550: through hole

600: rotation cover 620: protrusion

640: slot 660: protrusion

700: Packing

Claims (4)

One end is opened, the casing is hollow cylindrical, A stator fixed to the inner circumferential surface of the casing and wound with a coil; A rotor rotatably installed inside the stator and provided with a magnet; A printed circuit board equipped with a hall sensor for sensing the position of the rotor by sensing the magnetic force of the magnet; A through hole is provided in the center, and a casing cover coupled to one end of the casing; An annular protrusion is inserted into the through hole of the casing cover to fix the printed circuit board, and includes a rotating cover rotatably coupled to the casing cover to close the through hole of the casing cover. BCD motor with cover. The method of claim 1, BCD motor having a detachable cover, characterized in that it further comprises a packing closely installed between the casing cover and the rotary cover. The method of claim 1, The rotating cover, A plurality of slots are formed in an annular shape to the outside of the protruding portion is bolted to the casing cover through each of the plurality of slots, and can be rotated by the length of the plurality of slots BCD with a removable cover motor. The method of claim 1, The rotary cover, BCD motor having a separate cover, characterized in that it further comprises a projection protruding to the opposite side of the projection.

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