KR100917368B1 - Reduction-gears integrated bldc motor - Google Patents

Abstract

The present invention relates to a BLDC (BLDC) motor, more specifically, to integrate the BCD motor and the reducer to increase the power transmission efficiency with the reduction of noise and vibration due to the improvement of concentricity or coaxiality, The present invention relates to a speed reducer integrated BCD motor that can be easily assembled to a DC motor.

BCD motor, stator, rotor, reducer, sun gear, planetary gear, ring gear

Description

REDUCTION-GEARS INTEGRATED BLDC MOTOR}

The present invention relates to a BLDC (BLDC) motor, more specifically, to integrate the BCD motor and the reducer to increase the power transmission efficiency with the reduction of noise and vibration due to the improvement of concentricity or coaxiality, The present invention relates to a speed reducer integrated BCD motor that can be easily assembled to a DC motor.

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.

The conventional DC motor has been required to reduce the reliability, shorten the lifespan and consequent maintenance that are caused by the switching drive by the mechanical contact between the commutator and the brush. It's being replaced by Biel DC motor.

Brushless DC (BLDC) motors install the armature windings in the rotor and the stator in the rotor, and use a hall sensor, usually a photo diode, to draw the current through the windings. The motor is designed to have the same characteristics as the brush-type motor by determining the direction.

The BCD motor uses a switching method using a semiconductor device, eliminating the need for mechanical contact, and thus, the motor has a long life and uses a permanent magnet (magnet) having high energy density, which is advantageous for high efficiency and small size, and shift control. There is an advantage such as ease of use, the demand is increasing day by day.

The BCD motor is classified into an internal rotor type and an external rotor type according to the internal and external structures of the rotor and the stator. An electric motor is a stator in which a driving coil is wound around an integrated rotor as a shaft is attached to or adhered to a cylindrical magnet, and an abduction motor has a magnet provided around a stator in which a coil is wound. The self-rotating structure, that is, the cup-shaped rotor has a structure surrounding the drive coil. In particular, the electric motor is widely used because of its low rotational inertia and easy balance of the rotors.

Such a DC motor is classified into a magnet-attached motor and a magnet embedded motor according to the structure of the magnet provided in the rotor.

1 is a cross-sectional view illustrating a conventional magnet-attached BCD motor, and the magnet-attached BCD motor is rotatably installed inside the stator 20. 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 are formed by the teeth 24 together with the teeth 24. An insulator 28 is installed to insulate the slot 26 from the coil 22, and the rotor 10 is rotatably installed with a gap therein. Like the stator 20, the rotor 10 is formed in a circumferential shape by stacking a plurality of silicon steel sheets, and a coil wound around the stator 20 is fixed by penetrating the rotating shaft 11 at the center thereof. A magnet 12 generating torque by interaction with a magnetic field generated at 22 is attached along the outer circumferential surface of the yoke 13.

The magnet-attached BCD motor does not have a big problem in general small motors such as home appliances, but in the case of medium and large motors, the magnet 12 is increased due to the increase in the weight of the magnet 12 as the radius of the rotor 10 increases. The problem of detachment and breakage of the magnet 12 due to the centrifugal force occurs above the rotational speed of. Accordingly, magnet embedded BCD motors have been proposed to expand their applications.

2 is a cross-sectional view showing a conventional magnet embedded BCD motor, the conventional magnet embedded BCD motor is not different from the stator 20 of the magnet attached BCD motor, but the structure of the rotor 10 There is a big difference. That is, the recess groove 14 is formed so that the plurality of magnets 12 are embedded in the yoke 13, respectively, the plurality of magnets 12 are embedded in the recess groove 14 of the yoke 13, respectively. do.

In the conventional BCD motor as described above, the rotating shaft 11 inserted through the rotor 10 rotates together with the rotor 10, thereby transmitting rotational force to various mechanical devices connected to the rotating shaft 11. However, although the mechanical device may receive the rotational force of the rotating shaft 11 of the motor as it is, it is mostly converted to the rotational speed required for proper operation of each machine to receive the rotational force. Accordingly, the reduction gear is connected to the rotation shaft 11 of the motor to convert to the appropriate rotation speed.

The planetary reducer of the reducer is mainly used in aircraft, automobiles, office equipment, machine tools, etc., which require small and light weight because of its small volume and high power transmission efficiency, and in recent years, a precision mechanism technology field requiring ultra small and high output by combining with an actuator Its use is expanding.

3 and 4 are a perspective view and an exploded perspective view showing a general planetary reducer, the planetary reducer is arranged a ring gear 32, which is an internal gear on the outside, and a plurality of planetary gears 34 meshing with the ring gear 32; Is arranged circumferentially, and is configured to achieve concentricity by placing the sun gear 36 meshed with the planetary gear 34 in the center.

The planetary reducer may reduce the overall size by distributing the transmission load by using the planetary gear 34. When the planetary gears 34 are arranged symmetrically, the radial loads of the planetary gears 34 cancel each other and the shaft Only directional loads need to be considered. In addition, there is an advantage that the processing is easy, the contact linear velocity is small, the frictional loss is reduced due to the distribution of the transmission load, the noise is reduced and the efficiency is improved.

The planetary reducer as described above is transmitted to the rotational force of the input shaft 11 of the motor to the sun gear 36, the planetary gear 34 rotates in accordance with the rotation of the sun gear (36). The ring gear 32 is fixed so that the planetary gear 34 rotates inside the ring gear 32. When the rotational speed of the input shaft 11 is transmitted to the output shaft 40, the decelerated rotational force is transmitted to the output shaft 40 connected to the carrier 38 rotating together with the planetary gears 34 respectively rotating. It is delivered in a decelerated state.

In the case of combining the reducer with the conventional BCD motor as described above, the BCD motor and the reducer are manufactured separately and connected. Therefore, the concentricity or coaxiality of the input shaft of the motor and the output shaft of the reducer is changed so that power transmission is not performed smoothly. There is.

In addition, when combining the reducer with the BCD motor has a lot of assembly labor, there is a problem that noise and vibration occurs due to the assembly error, resulting in a decrease in the reliability and quality of the motor.

An object of the present invention devised to solve the above problems is to integrate the BC motor and the reducer to increase the power transmission efficiency with the reduction of noise and vibration due to the improvement of concentricity or coaxiality, The present invention provides a reducer-integrated BCD motor that can be easily assembled to a 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, the reducer-integrated BCD motor according to the present invention includes a stator for receiving a current and generating a magnetic force, rotatably installed in the stator, and provided with a magnet to rotate by the magnetic force. A rotor, an input shaft inserted through the rotor to rotate together, a sun gear coupled to the input shaft to rotate together, a plurality of planetary gears externally rotating to the sun gear, and a plurality of planetary gears A ring gear in contact with each other, a carrier supporting the plurality of planetary gears to rotate together, an output shaft connected to the carrier, and a hollow cylindrical shape having both ends opened, and the stator is fixed along one inner circumferential surface, and the other inner circumferential surface thereof. The ring gear is coupled to the casing is fixed so as to close both ends of the casing, the input shaft and And a pair of casing covers rotatably supporting the output shafts, respectively.

In addition, the ring gear is characterized in that formed integrally along the other inner peripheral surface of the casing.

The apparatus may further include an input shaft support member installed inside the casing to partition the rotor and the sun gear, and an input shaft support bearing installed between the input shaft and the input shaft support member. .

In addition, the input shaft support member and the casing is characterized in that formed integrally.

In addition, the carrier has a disk shape, characterized in that it further comprises a carrier bearing installed between the casing and the carrier.

In addition, the rotor is characterized in that the magnet attached to the magnet attached to the magnet along the outer circumferential surface.

The rotor may be a magnet embedded rotor in which a magnet is embedded therein.

In addition, the sun gear, planetary gear and ring gear is characterized in that it has an involute tooth.

In addition, the sun gear, planetary gear and ring gear is characterized by having a cycloid tooth.

The reducer-integrated BCD motor according to the present invention is combined with the BCD motor and the reducer integrally in one casing, and furthermore, the ring gear and the input shaft support member are integrally formed with the casing to form concentricity between the rotating shaft of the BCD motor and the reducer. And it is possible to reduce the vibration and noise generation by improving the coaxiality, it is possible to further improve the power transmission efficiency.

In addition, through the carrier bearing provided between the casing and the carrier, vibration and noise due to assembly errors can be further reduced.

In addition, as described above, it is possible to provide an easy-to-assemble, improved productivity, high reliability, and high quality BLC motor with the reduction of the assembly process according to the integration of the motor and the reducer.

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

5 is a perspective view showing an embodiment of the reducer-integrated BCD motor of the present invention, Figure 6 is a cross-sectional view showing a first embodiment as seen from line AA of Figure 4, Figure 7 is a line AA of Figure 4 8 is a cross-sectional view showing a second embodiment, FIG. 8 is a cross-sectional view showing a third embodiment as viewed from line AA of FIG. 4, FIG. 9 is a perspective view showing a housing in the embodiment of FIG. It is sectional drawing seen from the BB line of FIG.

As shown in FIGS. 5 and 6, the speed reducer integrated BCD motor according to the present invention includes a stator 100, a rotor 200, an input shaft 300, a sun gear 420, a planetary gear 440, and a ring gear. 460, a carrier 480, an output shaft 500, a casing 600, and a casing cover 700. In addition, the reducer integrated BCD motor of the present invention may further include an input shaft support member 800 and an input shaft support bearing 850 as shown in FIG. 7, and a carrier bearing 485 as shown in FIG. 8. It may be made to include more.

6 to 8, 1 and 2, the stator 100 is formed by laminating a plurality of coiled thin silicon steel sheet, a plurality of teeth (tooth) are provided at regular intervals along the inner circumferential surface Insulators are provided to insulate the slots formed by the teeth with the tooth from the coil. The stator 100 receives a current from the coil to generate a magnetic force.

The rotor 200 is installed inside the stator 100 and is equipped with a magnet (not shown) to rotate by the magnetic force generated in the stator 100. In addition, the rotor 200, like the stator 100, when referring to Figs. 1 and 2, a yoke formed in a cylindrical shape by laminating a plurality of silicon steel sheets, and the input shaft in the center as shown in Figs. The 300 is fixed through and is provided with a magnet that generates torque by interaction with a magnetic field generated in a coil wound on the stator 100. 1 and 2, the rotor 200 may be a magnet-attached rotor with a magnet attached to the outer circumferential surface, or may be a magnet embedded rotor with a magnet embedded therein.

Since the stator 100 and the rotor 200 as described above can be implemented in the prior art as in the general BCD motor, a detailed description thereof will be omitted.

6 to 8, the sun gear 420 is inserted into the rotor 200 and coupled to the input shaft 300 which rotates together, and the planetary gear 440 is provided with a plurality of the sun gears. 420 rotates externally, the ring gear 460 is inscribed with the planetary gears, the carrier 480 supports the planetary gears, respectively, and rotates together, and the output shaft 500 includes the carrier ( 480).

Therefore, when a current is applied to the coil wound on the stator 100 to generate a magnetic force, the rotor 200 rotates by the magnetic force generated in the coil, and the input shaft 300 according to the rotation of the rotor 200. Will rotate. The sun gear 420 rotates together with the rotation of the input shaft 300, and rotational force is transmitted to the plurality of planetary gears 440 that are externally engaged with the sun gear 420 to rotate. In this case, since the ring gear 460 is fixed to the casing 600 to be described later, the carrier 480 rotates together through the plurality of planetary gears 440, and eventually the output shaft 500 connected to the carrier 480. Rotational force is transmitted. That is, the rotation speed of the input shaft 300 is transmitted to the output shaft 500 at a reduced speed desired by the user through the above process.

The sun gear 420, the planetary gear 440, and the ring gear 460 may have teeth generated based on an involute curve, and the teeth generated based on a cycloide curve. May have Involut tooth curves have the advantage that they are easier to process than cycloid tooth curves, but they have a disadvantage in that they have higher vibration and noise than cycloid tooth curves in line contact. That is, the sun gear 420, the planetary gear 440 and the ring gear 460 should be designed in consideration of manufacturing cost, productivity and precision for each mechanical device.

6 to 10, as shown in FIGS. 6 to 10, both ends of the hollow cylindrical shape, the stator 100 is fixed along one inner circumferential surface, the ring gear 460 is fixed along the other inner circumferential surface do. That is, the casing 600 of the reducer-integrated BCD motor of the present invention is easily separated from the conventional motor and the reducer in a manner that is separately manufactured and combined, so that each component of the motor and the reducer inside one casing 600 is easy. Will be assembled to produce an integrated.

In addition, as shown in FIGS. 9 and 10, the ring gear 480 may be integrally formed along the other inner circumferential surface of the casing 600. That is, when the casing 600 is manufactured, the shape of the ring gear 480 may be integrally formed together to significantly reduce the number of assembly operations.

Casing cover 700 is provided with a pair is coupled to close both ends of the casing 600, and rotatably supports the input shaft 300 and the output shaft 500, respectively. 6 to 8, a bearing 750 is installed in the casing cover 700 to rotatably support the input shaft 300 and the output shaft 500, respectively.

The input shaft support member 800 is installed inside the casing 600 to partition the rotor 200 and the sun gear 420, and the input shaft 300 penetrates. In addition, since the input shaft support bearing 850 is installed between the input shaft 300 and the input shaft support member 800, the input shaft 300 can be prevented from swinging in the radial direction. Accordingly, the vibration and noise of the BCD motor can be further reduced. In this case, the input shaft support member 800 may be formed integrally with the casing 600, as shown in FIG.

Meanwhile, the carrier 480 may be installed in a disc shape as shown in FIG. 8, and in this case, the carrier bearing 485 may be installed between the casing 600 and the carrier 480. When the planetary gear 440 rotates along the outer circumferential surface of the ring gear 460 by receiving rotational force from the sun gear 420, vibration generated by machining tolerances between the gears or backlash is transmitted to the carrier 480. The carrier 480 tends to rotate slightly. However, by processing the carrier 480 in the shape of a disk as described above, by installing a carrier bearing 485 between the casing 600 and the carrier 480, it is possible to prevent such a slight shake at the source. .

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 a cross-sectional view showing a conventional magnet attached BCD motor,

2 is a cross-sectional view showing a conventional magnet embedded BCD motor,

3 is a perspective view showing a general planetary reducer,

4 is an exploded perspective view showing a general planetary reducer,

Figure 5 is a perspective view showing one embodiment of the reducer integrated BCD motor of the present invention,

6 is a cross-sectional view showing a first embodiment as seen from the line A-A of FIG.

FIG. 7 is a cross-sectional view showing a second embodiment as seen from the line A-A of FIG. 4;

8 is a cross-sectional view showing a third embodiment as seen from the line A-A of FIG.

9 is a perspective view of the housing in the embodiment of FIG. 7, FIG.

FIG. 10 is a cross-sectional view taken along line B-B of FIG. 8.

<Explanation of symbols for the main parts of the drawings>

100: stator

200: rotor

300: input shaft

420: sun gear

440: planetary gear

460: Ring Gear

480: carrier 485: carrier bearing

500: output shaft

600: casing

700: casing cover

800: input shaft support member 850: input shaft support bearing

Claims (9)

A stator that receives a current to generate a magnetic force, A rotor rotatably installed inside the stator and having a magnet to rotate by the magnetic force; An input shaft inserted through the rotor and rotating together; A sun gear coupled to the input shaft and rotating together; A plurality of planetary gears externally rotating to the sun gear, A ring gear inscribed with the planetary gears; A carrier supporting the plurality of planetary gears and rotating together; An output shaft connected to the carrier, A casing in which both ends are hollow cylindrical shapes, the stator is fixed along one inner circumferential surface, and the ring gear is fixed along the other inner circumferential surface; A pair of casing covers coupled to close both ends of the casing and rotatably supporting the input shaft and the output shaft, respectively; An input shaft support member installed inside the casing to partition the rotor and the sun gear, and through which the input shaft penetrates; An input shaft support bearing is installed between the input shaft and the input shaft support member, And the input shaft support member and the casing are integrally formed with a reducer integrated BC motor. The method of claim 1, And the ring gear is integrally formed along the inner circumferential surface of the other side of the casing. delete delete The method of claim 1, The carrier is disc-shaped, The reducer-integrated BCD motor further comprises a carrier bearing installed between the casing and the carrier. The method of claim 1, The rotor is a reducer-integrated BCD motor, characterized in that the magnet attached to the rotor attached to the magnet along the outer circumferential surface. The method of claim 1, The rotor is a reducer-integrated BCD motor, characterized in that the magnet embedded rotor with a magnet embedded therein. The method of claim 1, The sun gear, planetary gear and the ring gear is a reduction gear integrated BCD motor, characterized in that it has an involute tooth. The method of claim 1, The sun gear, planetary gear and the ring gear is a reduction gear integrated BCD motor, characterized in that it has a cycloid tooth.

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