KR101040958B1 - Rotor with accelerator and XLDC motor comprising same - Google Patents

Abstract

The present invention relates to a rotor having an accelerator and a BLDC motor comprising the same. The present invention has a rotor core having a hollow cylindrical shape, a drive shaft is installed in the inner space of the rotor core, the drive shaft is installed in the center and has a permanent magnet, and the rotation speed of the drive shaft is accelerated than the rotation speed of the rotor core It is configured to include an accelerator. According to the present invention, by installing an accelerator in an empty space inside the rotor, it is possible to efficiently use the space inside the rotor and reduce the axial length of the entire driver.

Stator, rotor, ring gear, planetary gear, sun gear

Description

Rotor having acceleration-gear and BLDC motor including the same}

The present invention relates to a rotor having an accelerator and a BLDC motor including the same, and more particularly, to a rotor having an accelerator that increases the space utilization of the BLDC motor by inserting the accelerator into an internal empty space of the rotor included in the BLDC motor. And to provide a BLDC motor comprising the same.

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.

Conventional direct current motors are operated by switching drive by mechanical contact between commutator and brush. Therefore, there has been a demand for improvement in reliability, reduction in lifespan, and the need for maintenance caused by mechanical contact. Accordingly, in recent years, an electronic switching brushless DC (BLDC) motor using a semiconductor device has been required. Is being replaced.

BLDC motors are motors that, as the name suggests, eliminate brush structures and perform commutation electronically in DC motors. That is, the position of the permanent magnet is detected by an electronic sensor such as a hall sensor, and the electric angle is judged by the detected signal to generate a torque by flowing a current through the coil wound on the stator.

Such BLDC motors are classified into an interior rotor type and an exterior rotor type according to the relative positions of the rotor and the stator.

The internal electric motor is a stator with a coil wound around a rotor integrated with a permanent magnet. The abduction motor has a structure in which a rotor with a permanent magnet rotates around a stator with a coil wound, that is, a cup shape. The rotor has a shape surrounding the coil. In particular, the electric motor is widely used because of low rotational inertia and easy balance of the rotor.

At this time, the accelerator has been used to attach the accelerator to increase the output rotation speed than the rotation speed input from the BLDC motor.

In general, when attaching an accelerator to a motor, a method in which the motor and the accelerator are separately manufactured and combined in the longitudinal direction is used, and thus, the overall length of the BLDC motor is increased, thereby decreasing the space utilization when the motor is applied to the system.

The present invention has been made to solve the above-described problems of the prior art, a rotor having an accelerator that can reduce the overall length of the BLDC motor by inserting the accelerator in the internal space of the BLDC motor, and increase the space utilization of the BLDC motor and It is possible to provide a BLDC motor including the same.

In order to achieve the above object, the rotor having an accelerator according to the present invention has a rotor core having a hollow cylindrical shape, a drive shaft is installed in the inner space of the rotor core and is provided with a permanent magnet, And an accelerator for accelerating the rotation speed of the drive shaft to be greater than the rotation speed of the rotor core.

The accelerator is formed along an inner circumferential surface of the rotor core, at least one ring gear that rotates together as the rotor core rotates, and externally circumscribes to the inner circumferential surface of the ring gear in engagement with the ring gear. And a sun gear positioned at the center of the rotor core and circumscribed to the outer circumferential surface of the at least one planetary gear to rotate with the planetary gear.

The rotational speed of the drive shaft is greater than the rotational speed of the rotor core according to the gear ratio of the ring gear, the planetary gear and the sun gear.

The planetary gear is characterized in that three or four.

The permanent magnet is characterized in that attached to the outer surface of the rotor core.

The permanent magnet is characterized in that it is embedded in the rotor core.

In addition, a BLDC motor including a rotor having an accelerator according to the present invention has a rotor having an accelerator, a hollow cylindrical shape, and a plurality of teeth on which coils are wound protrude at predetermined intervals in the circumferential direction along an inner circumferential surface thereof. And a rotor having an accelerator, wherein the coil includes a stator for generating a magnetic force to rotate the rotor having the accelerator inserted therein.

According to the present invention, the planetary gear accelerator may be inserted into an empty space inside the rotor constituting the BLDC motor to increase the space utilization of the empty space inside the rotor, and reduce the overall length of the BLDC motor combined with the accelerator.

In addition, by inserting a planetary geared accelerator into the BLDC motor, the manufacturing process of the motor is simplified, and an additional process for reducing the size of the motor and combining the motor and the accelerator is unnecessary.

In addition, the planetary gear accelerator may be inserted into an empty space inside the rotor constituting the BLDC motor, thereby reducing vibration and noise during driving.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention. However, in describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present invention belongs and are not directly related to the present invention are omitted. This is to more clearly communicate without obscure the core of the present invention by omitting unnecessary description.

On the other hand, in the accompanying drawings, some components are exaggerated, omitted, or schematically illustrated, and the size of each component does not entirely reflect the actual size. Like reference numerals refer to like or corresponding elements throughout the accompanying drawings.

A rotor having an accelerator according to an embodiment of the present invention and a BLDC motor including the same will be described below with reference to FIGS. 1 and 2. 1 is a view showing a BLDC motor including a rotor having an accelerator of the present invention. FIG. 2 is a perspective view illustrating the rotor having the accelerator of FIG. 1. FIG.

BLDC motor 100 including a rotor having an accelerator according to an embodiment of the present invention comprises a stator 10 and the rotor 20.

The stator 10 has a predetermined thickness and has a hollow cylindrical shape. The stator 10 includes a plurality of teeth 11 protruding at regular intervals in the circumferential direction along the inner circumferential surface.

In this case, the shape of the teeth 11 may be changed, and the number of teeth 11 may also be changed according to the size of the stator 10.

Although not shown, the coil 11 is wound around the tooth 11. The coil receives a current to generate a magnetic force. The magnetic force generated as described above generates torque for rotating the rotor 20.

 The rotor 20 is installed in the stator 10 to be spaced apart from the stator 10 by a predetermined interval. The rotor 20 includes a rotor core 30, an accelerator 40, a permanent magnet 50, and a drive shaft 60.

The rotor core 30 has a hollow cylindrical shape and rotates by a magnetic force generated by a coil (not shown) wound around the teeth 11 of the stator 10. The rotor core 30 has a permanent magnet 50.

The permanent magnet 50 forms an integrated ring shape or a ring shape by a plurality of parts, and the stator 10 is formed on the outer circumferential surface of the rotor core 30 by an adhesive method, an interference fit method, or a separate coupling member. And spaced apart at regular intervals.

On the other hand, although not shown, the permanent magnet 50 is attached to the rotor core 30 is not a big problem in use in general small motors such as home appliances, but in the case of medium and large motor rotor core 30 Due to the increase in the weight of the permanent magnet 50 as the radius of the larger the problem of separation and breakage of the permanent magnet 50 occurs over a predetermined number of revolutions. In order to compensate for this, the permanent magnet 50 may be installed to be embedded in the rotor core 30.

The accelerator 40 is a planetary geared accelerator. Planetary geared accelerators are mainly used in aircraft, automobiles, office equipment, machine tools, etc., which require small weight due to their small volume and high power transmission efficiency.

Planetary geared accelerators have recently been extended to the field of precision mechanism technology, which requires miniaturization and high output combined with actuators.

The accelerator 40 is installed in the inner space of the rotor core 30 and the drive shaft 60 is installed at the center.

The accelerator 40 accelerates the rotation speed of the drive shaft 47 to be greater than the rotation speed of the rotor core 30 that is rotated by the stator 10. Here, the rotational speed means the number of rotations to rotate during a certain time.

Specifically, the accelerator 40 includes a ring gear 41, a planetary gear 43 and a sun gear 45.

The ring gear 41 is formed integrally with the rotor core 30 along the inner circumferential surface of the rotor core 30, and rotates together as the rotor core 30 rotates.

Although the ring gear 41 according to the embodiment of the present invention has been described as being integrally formed with the rotor core 30, the ring gear 41 is not limited thereto and may be separately formed and installed on the inner circumferential surface of the rotor core 30.

At least one planetary gear 43 is external to the inner circumferential surface of the ring gear 41 to rotate in engagement with the ring gear 41, it is preferable that three to four are provided.

The sun gear 45 is positioned at the center of the rotor core 30, is external to the outer circumferential surface of the planetary gear 43, and meshes with the planetary gear 43 to rotate.

In this case, the at least one planetary gear 43 is preferably disposed in a form surrounding the sun gear 45.

The accelerator 40 can be converted to an appropriate rotational speed by adjusting the gear ratio of the ring gear 41, the planetary gear 43, and the sun gear 45.

That is, when a current is supplied to a coil wound around the teeth 11 of the stator 10 and a magnetic force is generated, torque is generated by the magnetic force to rotate the rotor core 30.

As the rotor core 30 rotates, the ring gear 41 in contact with the inner circumferential surface of the rotor core 30 meshes with each other and rotates. As the ring gear 41 rotates, the planetary gear 43 and the sun gear 45 are rotated. In turn, power is transmitted to the drive shaft 60 inserted into the sun gear 45 to rotate.

At this time, the drive shaft 60 is accelerated by the accelerator 40 to rotate at a rotation speed greater than the rotation speed of the rotor core 30.

As the outer diameter of the BLDC motor 100 increases, the output of the motor increases. In addition, when the outer diameter increases to increase the output of the motor, the internal space between the stator 10 and the rotor core 30 and the drive shaft 60 in the center of the rotor core 30 increases proportionally. do.

Therefore, the BLDC motor 100 of the present invention efficiently utilizes the wasted space by disposing the accelerator 40 in an empty space therein, and does not need to additionally combine the accelerator in the longitudinal direction to reduce the size of the entire motor. Can be.

Thus far, a rotor having an accelerator and a BLDC motor including the same according to the present invention have been described. In the present specification and drawings, preferred embodiments of the present invention have been disclosed, and although specific terms have been used, these are merely used in a general sense to easily explain the technical contents of the present invention and to help the understanding of the present invention. It is not intended to limit the scope. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

1 is a view showing a BLDC motor including a rotor having an accelerator of the present invention.

FIG. 2 is a perspective view illustrating the rotor having the accelerator of FIG. 1. FIG.

Explanation of symbols on the main parts of the drawings

10: stator 20: rotor

30: rotor core 40: accelerator

41: ring gear 43: planetary gear

45: sun gear 50: permanent magnet

60: drive shaft

100: BLDC motor including rotor with accelerator

Claims (7)

As a rotor inserted into the stator of the BLDC motor, A rotor core having a hollow cylindrical shape; A permanent magnet installed on an outer circumferential surface of the rotor core; And an accelerator installed in the inner space of the rotor core and provided with a drive shaft at a center thereof, the accelerator configured to accelerate the rotation speed of the drive shaft to be greater than the rotation speed of the rotor core. The accelerator, A ring gear formed along an inner circumferential surface of the rotor core and rotating together as the rotor core rotates; At least one planetary gear that is external to an inner circumferential surface of the ring gear and rotates in engagement with the ring gear; A sun gear positioned at the center of the rotor core and provided with the drive shaft, the sun gear externally engaged with the outer circumferential surface of the at least one planetary gear and engaged with the planetary gear to rotate; Rotor having an accelerator, characterized in that it comprises a. delete The method of claim 1, And a rotation speed of the drive shaft is greater than a rotation speed of the rotor core according to the gear ratio of the ring gear, the planetary gear, and the sun gear. The method of claim 3, The planetary gear is a rotor having an accelerator, characterized in that three or four. 5. The method of claim 4, And the permanent magnet is attached to an outer surface of the rotor core. 5. The method of claim 4, The permanent magnet is a rotor having an accelerator, characterized in that embedded in the rotor core. A rotor having an accelerator according to any one of claims 1 and 3; A rotor having a hollow cylindrical shape, and a plurality of teeth to which the coil is wound protrudes at a predetermined interval in the circumferential direction along the inner circumferential surface, and the coil has the accelerator inserted therein to generate a magnetic force by receiving a current. A stator for rotating the BLDC motor comprising a rotor having an accelerator, characterized in that it comprises a.

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