KR20040073266A - DC brushless motor with reducer - Google Patents

Abstract

PURPOSE: A DC brushless motor is provided to connect and integrate, in a reasonable way, components including a driver, mechanical brake, motor body and a reducer without increasing an axial length. CONSTITUTION: A DC brushless motor comprises a motor body(16) controlled by a driver(12); a reducer(18) integrally connected to the motor body; and a mechanical brake(14) for providing braking operation to a rotation of a motor shaft(20) of the motor body. The driver, mechanical brake, motor body, and an input shaft of the reducer are mounted in order on the same axial line. The driver is equipped with a driver cover(70) in the mechanical brake side, wherein the driver cover also functions as a cover of the mechanical brake.

Description

DC brushless motor with reducer

The present invention relates to a DC brushless motor with a speed reducer.

The DC brushless motor has the advantage that starting torque is large compared with an induction motor, and can endure frequent starting and stopping well. Moreover, compared with the structure which controls and drives an induction motor by a so-called inverter, generally higher precision can be obtained. Therefore, in recent years, it is used a lot in various fields.

The DC brushless motor is generally controlled and driven by a controller called a driver. This driver is a pure electric component and is installed at a position away from the conventional motor main body for the purpose of intensively driving and controlling a large number of motor main bodies in a factory, and is connected to each motor main body by a cable. The constitution to adopt is adopted.

However, in recent years, due to production requests for small quantities and many kinds, layouts for driving and controlling machines in factories are required independently. For this purpose, each machine can be driven and controlled independently in each place. Progress has been made in a more convenient situation.

In view of this, in recent years, as described in, for example, Non Patent Literature 1 (see FIG. 2), the motor main body 2 and the driver 4 are integrated with each other, and the motor main body 2 is provided alone. A driver-integrated DC brushless motor 6 has also been proposed, which enables driving and control.

<Non Patent Literature 1>

Matsushita Denki Industrial Co., Ltd., motor company, catalog of circuit-integrated brushless motors (September 2002)

For example, in a shutter, an electric curtain drive DC brushless motor, a lift drive drive DC brushless motor, or the like, the object to be driven must be kept in a state where it is stopped at an arbitrary position. In such a use, a mechanical brake mechanism for keeping the driven object in a stopped state at the time of stopping, i.e., when the power supply is turned off, becomes essential.

Moreover, when using a DC brushless motor for such a use, since the rotational speed is too high as it is, there is a case where it is necessary to install a reduction gear in many cases.

When a mechanical brake mechanism is attached to a DC brushless motor with a driver, for example, when the mechanical brake mechanism is placed on the output shaft side of the motor main body, the mechanical brake mechanism is consequently sandwiched between the motor main body and the reducer. Problems such as difficulty in maintenance of the mechanical brake mechanism occur. In addition, when the mechanical brake mechanism is provided on the anti-motor main body side of the driver, it is necessary to form a configuration in which the motor shaft of the motor main body penetrates the center of the driver, making the design of the driver difficult. Problems arise.

The present invention has been made in view of such a conventional situation, and particularly, in a driver-integrated DC brushless motor, a structure for arranging the driver, the motor main body, the mechanical brake mechanism, and the reducer in terms of technology is most reasonably provided. It is the task to do it.

1 is a cross-sectional view showing a configuration example of a DC brushless motor with a reduction gear to which the present invention is applied;

2 is a cross sectional view showing a configuration example of a conventional DC brushless motor with a driver integrated type.

<Description of Symbols for Major Parts of Drawings>

10: DC brushless motor with reducer

12: driver

14 mechanical brake mechanism

16: motor body

18: reducer

20: motor shaft

22: rotating disc

24: motor cover

28: casing body

30: fixed disk

40: input shaft (motor shaft)

42: eccentric body

44: shout

46: Pinch

48: inner pin

50: carrier

52: output shaft

60: load side cover of the motor body

64: load side cover of reducer

66: reducer casing

70: driver cover

80, 82: cable

84: socket

L: axis

The present invention provides a DC brushless motor having a reducer in which a reducer is integrally connected to a motor main body of a DC brushless motor controlled by a driver, and includes a mechanical brake mechanism capable of braking the rotation of the motor shaft. The above problems are solved by mounting the input shafts of the driver, the mechanical brake mechanism, the motor main body, and the reducer on the same axis line in this order.

In the present invention, the driver, the mechanical brake mechanism, the motor main body, and the speed reducer (input shaft) are assembled on the same axis in this order, so that the driver does not need to penetrate the motor shaft of the motor main body. In addition, since the driver is integrated with the motor main body, there is no need to provide a separate driver (controller) externally, and the laying of cables therebetween is also unnecessary.

In addition, since the mechanical brake mechanism is to be sandwiched between the driver and the motor main body, the extension of the motor shaft of the motor main body is minimal, and the removal of the driver is simpler than the removal of the reducer (with oil or the like). . In other words, it is possible to prevent the occurrence of a difficult situation in which, for example, the driver is sandwiched between the motor main body and the reducer, and the maintenance thereof becomes difficult.

If the driver has a driver cover on the mechanical brake mechanism side, and the driver cover also serves as a cover of the brake mechanism, the driver is placed in a cover-attached state when maintenance of the mechanical brake mechanism is performed. You can certainly pull it out (almost completely independent). Moreover, by removing this driver, the mechanical brake mechanism can be exposed as it is, and the maintenance of the mechanical brake mechanism can be started immediately.

Embodiment of the Invention

EMBODIMENT OF THE INVENTION Hereinafter, the example of embodiment of this invention is described in detail based on drawing.

In FIG. 1, the example of the DC brushless motor with a speed reducer to which embodiment of this invention was applied is shown.

The DC brushless motor 10 with this speed reducer includes a driver 12, a mechanical brake mechanism 14, and a motor main body 16 on the same axis L in this order, and further reducers 18 in succession. ) Is provided on the same axis (L).

The driver 12 converts single-phase or three-phase alternating current (AC) into direct current (DC), and generates electric power for controlling and driving the motor main body 16. The driver 12 has a built-in regenerative brake circuit (not shown) and is designed to recover braking energy generated during braking. The braking of the motor main body 16 by the function of the driver 12 is to reduce the rotational speed during rotation to the last, and there is no function to maintain the braking during stop. The configuration of the driver 12 itself is not particularly different from the conventional one, and thus detailed illustration and detailed description are omitted.

The mechanical brake mechanism 14 can apply braking to the rotation of the motor main body 16 mechanically even when the power supply is turned off. The motor shaft 20 of the motor main body 16 is extended and inserted in the center part of this mechanical brake mechanism 14, and the rotating disk (1st friction plate) 22 is integrated with this motor shaft 20 integrally. It is possible to rotate. In addition, the motor cover 24 is fixed to the casing main body 28 via the bolt 26. The fixed disk (second friction plate) 30 is fixed to the motor cover 24 via the bolt 32 to face the rotating disk 22.

The mechanical brake mechanism 14 maintains a state (braking state) in which the rotating disk 22 and the fixed disk 30 are pressed by a spring (not shown) at the time of stopping, including when the power is turned off, and at the time of operation. It generates a release state by generating an electromagnetic force enough to overcome this pressing force. By increasing or decreasing the release current at this time, the generated electromagnetic force can be controlled, and the braking force to be applied can be adjusted.

The motor main body 16 is brushless and can be driven by direct current (DC). The control regarding the rotation of the motor main body 16 is configured to receive all from the driver 12 side.

In this example, the reduction gear 18 has a planetary gear structure of a swinging internal engagement type. That is, the motor shaft 20 of the motor main body 16 extends to the inside of the reduction gear 18, and functions as the input shaft 40 of the reduction gear 18 as it is. On the outer circumference of the input shaft 40, the outer gear 44 is assembled freely to swing and rotate through the eccentric body 42, and is engaged internally with the internal gear 46 in a fixed state. The external gear 44 and the internal gear 46 have a slight dimension difference of about 1-3. In this reducer 18, the rotating component of the external gear 44 is transmitted to the carrier 50 through the inner pin 48, and the power is output from the output shaft 52 integrated with the carrier 50. It is.

The load side cover 60 of the motor main body 16 also serves as the input side cover of the reducer 18 and is integrally formed with the casing main body 28. The load side cover 64 of the reducer 18 is fixed to the casing body 28 via a bolt 68 together with the reducer casing 66 integrated with the internal gear 46.

As apparent from FIG. 1, the driver 12 includes a driver cover 70 on the mechanical brake mechanism 14 side, and the driver cover 70 also serves as a cover of the mechanical brake mechanism 14. have. The driver cover 70 is fixed and connected to the flange portion 74 of the casing body 28 via the bolt 72. Electrical connection of the driver 12 side, the mechanical brake mechanism 14, and the motor main body 16 side is made via the cables 80 and 82. Connection of the cables 80 and 82 is performed through the removable socket 84 in consideration of the convenience at the time of detachment. In the case where the length of the cable is allowed to be spared, the socket is not particularly required.

Next, the operation of this embodiment will be described.

The motor main body 16 basically controls the rotation state of the motor shaft 20 by the DC drive current controlled by the driver 12 (including regenerative braking). While the motor shaft 20 is rotating, the mechanical brake mechanism 14 is basically kept in the released state. The rotation of the motor shaft 20 is directly transmitted to the reducer 18 side as the rotation of the input shaft 40 of the reducer 18, decelerated at a predetermined reduction ratio by a known action, and then output from the output shaft 52. .

Here, in order to maintain the stopped state while the motor shaft 20 is stopped, the release current of the mechanical brake mechanism 14 is turned off, and the rotating disk 22 and the fixed disk 30 are rubbed by the elastic force of the spring. Bond. This makes it possible to maintain this braking state without particularly consuming power. Therefore, when the object to be driven, for example, a shutter, an electric curtain, various lifting devices, etc., which will fall by gravity as it is, is to be driven, it is possible to fix the driven object at an arbitrary position.

In this embodiment, since the driver 12 is integrally connected to the motor main body 16, it does not need a separate driver (controller), and does not need the cable etc. which electrically connect these, either. Moreover, since the mechanical brake mechanism 14 is arrange | positioned between the motor main body 16 and the driver 12, extension of the motor shaft 20 is complete | finished at the minimum, and the center of the driver 12 is centered on the motor shaft 20. As shown in FIG. Since this does not pass, the design of the driver 12 is also easy.

In addition, by removing the bolt 72, the driver 12 can be taken out together with the driver cover 70. This withdrawal is extremely simple compared to withdrawing the reducer 18 (with oil present), for example. In addition, since the cables 80 and 82 are detachably connected via the socket 84, the cables 80 and 82 of the driver 12 can be easily separated and reassembled.

In addition, since the driver cover 70 also serves as a cover of the mechanical brake mechanism 14, the mechanical brake mechanism 14 is exposed as it is when the driver 12 is pulled out, so that the mechanical brake mechanism 14 is held. It is also easy to repair.

On the other hand, since the mechanical brake mechanism 14 does not exist between the motor main body 16 and the reduction gear 18, the structure in which the motor shaft 20 becomes the input shaft 40 of the reduction gear 18 as it is is rigid. ) Can be easily achieved while maintaining high).

By the above structure, four components, ie, the driver 12, the mechanical brake mechanism 14, and the motor main body 16, are prevented from increasing the axial length of the DC brushless motor 10 with a reduction gear. , The reducer 18 can be reasonably connected in a state of high rigidity.

In the above embodiment, as the speed reducer 18, a speed reducer having a swinging internal engagement type planetary gear structure is applied. However, the present invention is not particularly limited to the specific configuration of the speed reducer.

Moreover, also about the structure of the mechanical brake mechanism 14, it is not specifically limited to the said structure.

According to the present invention, in particular, with respect to a DC brushless motor having a speed reducer equipped with a driver and a mechanical brake mechanism, each element can be reasonably prevented while preventing the occurrence of difficult situations or problems such as an increase in the axial length. An excellent effect of being able to connect and integrate is obtained.

Claims (2)

In a DC brushless motor having a reducer in which a reducer is integrally connected to a motor main body of a DC brushless motor controlled by a driver, A mechanical brake mechanism capable of applying braking to rotation of the motor shaft of the motor main body, The input shafts of the driver, the mechanical brake mechanism, the motor main body, and the reducer are mounted on the same axis in this order. DC brushless motor with a reducer. The method of claim 1, The driver includes a driver cover on the mechanical brake mechanism side, and the driver cover also serves as a cover of the mechanical brake mechanism.