JP4167546B2 - Outer rotor type brushless motor for automatic door - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an outer door brushless motor for automatic doors, and more particularly to an outer door brushless motor for automatic doors used with an automatic door having a door opening / closing drive belt.
[0002]
[Prior art]
The sliding door type automatic door can be opened and closed by placing a door wheel that suspends the door on a slide rail provided above the doorway. Since the door is connected to a belt driven by a motor and travels along the slide rail, the driving force of the motor is transmitted by the belt and pulley to open and close the door. Since a large torque generated in a small space is required to open and close the door, a motor that rotates at high speed is used in combination with a reduction gear. In addition, since the motor and the speed reducer generate considerable vibration, they are installed invisible using vibration suppression materials. The automatic door further requires a detector and a motor control device for controlling the door opening / closing operation.
[0003]
In such a configuration, the equipment that must be mounted on the frame together with the motor is a speed reducer, a pulley for driving a belt attached to the output shaft of the speed reducer, a motor rotation detector, and the like. Must be installed on the frame via a damping device. Since these devices are required, the size, weight, and total price of the automatic door driving device are increased, the number of assembly steps is long, and a long time is required.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 5-308766
[Problems to be solved by the invention]
So far, direct drive type outer rotor type rotating electrical machines and the like have been proposed as motors. However, such a motor can be installed in a limited small space, can generate a large torque, and cannot satisfy the demand for use in an automatic door, which must be robust and low in noise. (For example, refer to Patent Document 1). Accordingly, it has been desired to develop a motor that stably supports a large driving force applied to a belt pulley for driving a door, is low in speed, has a large torque, does not require a reduction gear, and is small and suitable for use in an automatic door.
[0006]
Accordingly, an object of the present invention is to obtain an outer door brushless motor for an automatic door that can stably support a large driving force applied to a belt pulley, is small, and is suitable for use in an automatic door.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, an outer rotor type brushless motor for an automatic door according to the present invention is an outer rotor type brushless motor for an automatic door used together with an automatic door having a door opening / closing drive belt, and has a boss portion at one end. A stator having a stator core, a hub portion rotatably supported via a bearing on the boss portion, a rotor core extending from the hub portion to the outer periphery of the stator, and the drive belt provided on the outer periphery of the hub portion A pulley portion having an outer peripheral surface around which the rotor is wound, and a rotor rotatable with respect to the stator, (a) the bearing is a single cylindrical bearing, and (b) the outer peripheral surface The position is in a plane passing through the boss part and its radially outer bearing with respect to a plane perpendicular to the central axis of the boss part, and the pulley part on the hub part The acting force from the actuating drive belt is directly transmitted to the boss part in the radial direction. (C) The rotor has a permanent magnet, and the permanent magnet is provided on the rotor core and radially inward. Inserted in a partially open axial slot, (d) a detector is mounted in an annular space formed between the stator core and the body of the rotor core; (E) An outer rotor type brushless motor, wherein the stator includes cooling fins.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 1 and 2 show a schematic plan view and a schematic front view, respectively, of an example in which the outer rotor type brushless motor for an automatic door according to the present invention is applied to an automatic door. In the automatic door, a door driving device is stored in the interior of the seamless 2 disposed above the doorway of the building 1. An outer rotor type brushless motor 4 having a drive pulley 3, a motor control device 5, a driven pulley 6 and a slide rail 7 (FIG. 2) are attached to the wall surface of the building 1. Between the driving pulley 3 and the driven pulley 6, a driving belt 8 for opening and closing a door such as an endless timing belt, a V-belt, and a wire is hung.
[0009]
In the illustrated example, the automatic door is provided with two doors 11 and 12, which are suspended from the slide rail 7 by a pair of door wheels 13 and run on the slide rail 7. The doorway of the building can be opened and closed. Of the doors 11 and 12 suspended by the door wheel 13, the left door 11 in the figure is connected to the upper running portion of the drive belt 8 by the connecting metal 14, and the right door 12 in the figure is driven by the connecting metal 15. It is connected to the lower traveling portion of the belt 8. When the motor 4 is driven and the drive pulley 3 drives the drive belt 8 counterclockwise in the figure, the left door 11 moves to the left, the right door 12 moves to the right, and the doorway is opened. The When the drive belt 8 is driven in the clockwise direction in the drawing, the left door 11 moves to the right and the right door 12 moves to the left to close the doorway.
[0010]
3 to 6 show an embodiment of the automatic door outer rotor type brushless motor 4 (hereinafter sometimes simply referred to as a motor) shown in FIGS. 1 and 2 according to the present invention. This outer rotor type brushless motor 4 is an outer rotor type brushless motor for an automatic door suitable for use with an automatic door having doors 11 and 12 having a drive belt 8 for opening and closing the door as shown in FIGS. .
[0011]
The motor 4 includes a stator 20 and a rotor 21. The stator 20 has a mounting plate 22, a shaft portion 23 that rises from the center portion of the mounting plate 22 and is supported in a cantilever manner, and a boss portion 24 that is provided at the tip of the shaft portion 23. The mounting plate 22 is provided with a motor mounting hole 25 and a cooling fin 26 for heat dissipation. An iron core 28 around which a coil 27 is wound is fixed on the shaft portion 23, and the coil 27 and an electrical connection to an external circuit such as the control device 5 (FIG. 1) are connected to the coil 27 like a lead wire 29. Or from the magnetic pole position detector 32 attached to the mounting plate 22 like the lead wire 31 through the center hole 30 provided in the shaft portion 23, respectively. In addition, a rotational position detector 33 is mounted on the mounting plate 22 with a screw 34 in a space 33 a surrounded by a rotor described later between the mounting plate 22 and the iron core 28. As described above, the mounting plate 22, the shaft portion 23, the boss portion 24, and the iron core 28 constitute the stator core 35 of the motor 4.
[0012]
On the overall substantially cylindrical stator 20 configured in this manner, a cup-shaped rotor 21 that is substantially inverted as a whole is placed so that the hub portion 36 is supported by the boss portion 24 of the stator 20. It is rotatably supported. The hub portion 36 of the rotor 21 is provided in a portion corresponding to the bottom wall 37 of the cup-shaped rotor 21, has a cylindrical bearing 38 on the inner peripheral surface, and is supported by the boss portion 24 by this bearing 38. Yes. This bearing 38 is a ring type oilless bearing with one bearing.
[0013]
From the hub portion 36, a bottom wall 37 extends along the stator 20 in the radial direction, and an outer peripheral edge thereof is continuous with a peripheral wall 39 that is a trunk portion of the rotor 21 extending in the radial direction at the outer peripheral portion of the stator 20. The bottom wall 37 and the peripheral wall 39 constitute a rotor core 40 that extends to the outer periphery of the stator 20. On the inner peripheral surface of the peripheral wall 39 of the rotor core 40, eight axial slots 41 are formed in parallel with each other at predetermined equal intervals. Between each slot 41, there is a holding portion 42 extending at both ends in the circumferential direction at the tip, and a ridge portion 43 having a T-shaped cross section as a whole is provided. Thus, in the radially inner portion of the slot 41, a portion 44 whose both ends are closed in the radial direction by the pressing portion 42 and a portion 45 opened in the central portion are formed and partially opened in the radial direction. ing. In the slots 41, plate-like permanent magnets 46 are inserted and fixed, respectively. The number of slots 41 or permanent magnets 46 is not limited to 8, but may be 4, 12, 16, or 24, for example.
[0014]
A pulley portion 48 around which the drive belt 8 is wound is provided on the outer periphery of the hub portion 36 of the rotor 21 that functions as a bearing portion that rotatably supports the rotor 21 with respect to the stator 20. The pulley portion 48 is a portion formed integrally and continuously with the hub portion 36 and the bottom wall portion 37 of the rotor core 40, and the hub portion 36, the rotor core 40 and the pulley portion 48 constitute the rotor 21 together with the permanent magnet 46 and the like. is doing. A stopper 50 fixed with a screw 49 is provided at the tip of the boss portion 24 of the stator 20 to prevent the boss portion 24 of the rotor 21 from moving away from the stator 20 in the tip direction.
[0015]
An annular abutment plate 52 is fixed to the outer end surface of the pulley portion 48 with a screw 51 so as to prevent the drive belt 8 (FIGS. 1 and 2) hung around the pulley portion 48 from falling off. In the illustrated example, the drive belt 8 is a timing belt having a large number of protrusions or ridges and grooves on the inner surface of the belt, and therefore the outer peripheral surface 53 of the pulley portion 48 has unevenness corresponding to the unevenness of the protrusions of the belt 8. It is provided. When the driving belt 8 is a V belt, a V groove corresponding to the side surface of the V belt is formed on the outer peripheral surface 53 of the pulley portion 48, and when the driving belt 8 is a wire, the outer peripheral surface 53 of the pulley portion 48 is formed on the outer peripheral surface 53. An uneven surface corresponding to the outer peripheral surface of the wire is formed, and an outer peripheral surface 53 that does not slip is formed according to the drive belt used.
[0016]
The position of the outer peripheral surface 53 of the pulley portion 48 around which the drive belt 8 is wound is, as shown well in FIG. 4, with respect to the plane perpendicular to the central axis of the boss portion 24 and the boss portion 24 and its radially outer side. The acting force from the driving belt 8 which is in a plane passing through the bearing 38 and acts on the pulley portion 48 on the hub portion 36 is directly transmitted to the boss portion 24 in the radial direction. In other words, the acting force from the drive belt 8 is prevented from becoming a rotational moment in the bearing 38 which is a bearing portion between the stator 20 and the rotor 21.
[0017]
As shown in detail in FIG. 6, the peripheral wall 39, which is a body portion that extends from the hub portion 36 of the rotor core 40 and surrounds the stator core 35, has a mounting plate for the stator core 35 at its front end portion 54 corresponding to a cup-shaped opening. 22 and facing each other with a narrow gap 55 formed therebetween. The mounting plate 22 is provided with a pair of parallel annular ridges 56 and 57 that are spaced apart from the tip portion 54 and sandwich the tip portion 54, and the mounting plate 22 of the tip portion 54 and the stator core 35. A labyrinth seal 58 having a narrow curved path is formed between the two. Here, since the labyrinth seal 58 should just be formed between the front-end | tip part 54 of the rotor core 40, and the attachment plate 22 of the stator core 35, the structure of this part can carry out various deformation | transformation. For example, instead of the protrusions 56 and 57, an annular groove may be simply formed in the mounting plate 22, and the tip 54 of the rotor core 40 may be received in the annular groove, or the number of annular grooves may be changed. A groove can also be provided on the tip 54 side.
[0018]
As described above, the magnetic pole position detector 32 attached to the attachment plate 22 is disposed between the attachment plate 22 of the stator core 35 and the iron core 28 in the annular space 33 a surrounded by the peripheral wall 39 of the rotor core 40. A rotational position detector 33 is attached. The rotational position detector 33 is a photoelectric type that includes a light emitting unit 60 and a light receiving unit 61 that are arranged with an annular slit plate 59 having a slit and rotating together with the rotor core 40.
[0019]
When the outer rotor type brushless motor according to the embodiment described above is used, it is not necessary to provide a drive pulley, a speed reducer, and a damping material as independent parts, which are conventionally required for an automatic door, and the material and assembly man-hours are greatly increased. This can reduce the cost of automatic doors. In addition, the installation space of the drive pulley can be reduced to less than half of the conventional one, the drive pulley can be installed in a symmetrical position with the driven pulley, the door assembly is symmetrical, and the door opening and closing is balanced Get better. It also reduces vibration and noise caused by the reducer.
[0020]
Since only one bearing between the rotor and the stator is arranged at the position where the tension of the drive belt is applied, the life of the number of times of opening and closing by forward and reverse rotation of the motor is increased several times. Further, since the detection unit is installed inside the motor, a detector frame is unnecessary, and the cost can be reduced. Further, since the motor is a low speed motor, the balancing operation can be simplified in the assembly of the rotor portion.
[0021]
Since the permanent magnet of the motor is inserted into the slot inside the rotor, it is not necessary to fix it with an adhesive or taping, and the assembly work can be done easily and in a short time. Further, since a labyrinth seal-like gap is formed between the stator and the rotor, wind pressure is generated during rotation of the motor, making it difficult for dust to enter, and a packing member such as a V-ring or an O-ring is not necessary.
[0022]
If this outer door type brushless motor for automatic doors is used, the drive part material of the automatic door opening / closing drive mechanism can be reduced by more than half, and the structure can be easily assembled, disassembled and separated, contributing to recycling and the environment.
[0023]
【The invention's effect】
As described above, the outer rotor type brushless motor for automatic doors of the present invention is an outer door type brushless motor for automatic doors used with an automatic door having a door opening / closing drive belt, and has a stator having a stator core having a boss portion at one end; A hub portion rotatably supported on the boss portion via a bearing, a rotor core extending from the hub portion to the outer periphery of the stator, and an outer peripheral surface provided on the outer periphery of the hub portion and on which the drive belt is wound And (a) the bearing is a single cylindrical bearing, and (b) the position of the outer peripheral surface is the position of the boss portion. Drive plane acting on the pulley on the hub part, in a plane passing through the boss part and its radially outer bearing, in a plane perpendicular to the central axis (C) The rotor has a permanent magnet, and the permanent magnet is provided on the rotor core and is partially opened radially inward. (D) a detector is mounted in an annular space formed between the stator core and the body of the rotor core; and (e) the above An outer rotor type brushless motor, wherein the stator includes cooling fins. Accordingly, it is possible to stably support a large driving force applied to the belt pulley, and it is possible to obtain an outer door brushless motor for an automatic door that is small and suitable for use in an automatic door.
[Brief description of the drawings]
FIG. 1 is a schematic plan view showing an embodiment in which an outer rotor type brushless motor for an automatic door according to the present invention is applied to an automatic door.
FIG. 2 is a schematic front view of the outer rotor type brushless motor for automatic doors of FIG. 1;
FIG. 3 is a schematic plan partial sectional view of an outer door brushless motor for an automatic door according to the present invention.
4 is a schematic front sectional view of the outer door brushless motor for automatic doors of FIG. 3;
FIG. 5 is a schematic view showing a stator core of the automatic door outer rotor type brushless motor of FIG. 3;
6 is a schematic sectional view showing a labyrinth seal portion of the outer rotor type brushless motor for automatic doors of FIG. 3;
[Explanation of symbols]
8 Drive belt, 11, 12 Door, 20 Stator, 21 Rotor, 24 Boss part, 31, 33 Detector, 33a Annular space, 35 Stator core, 36 Hub part, 37 One end (bottom wall), 39 Body, 40 Rotor core, 41 slots, 46 permanent magnet, 48 pulley, 54 tip, 58 labyrinth seal.

Claims (2)

An outer door type brushless motor for an automatic door used with an automatic door having a drive belt for opening and closing the door,
A stator having a stator core with a boss portion at one end;
A hub portion rotatably supported on the boss portion via a bearing, a rotor core extending from the hub portion to the outer periphery of the stator, and an outer peripheral surface provided on the outer periphery of the hub portion and on which the drive belt is wound A pulley portion having, and a rotor rotatable with respect to the stator,
(A) the bearing is a single cylindrical bearing;
(B) The position of the outer peripheral surface is a plane perpendicular to the central axis of the boss portion, and is in a plane passing through the boss portion and the radially outer bearing, and from the drive belt acting on the pulley portion on the hub portion. The acting force is transmitted directly to the boss part in the radial direction,
(C) The rotor has a permanent magnet, and the permanent magnet is inserted in an axial slot provided in the rotor core and partially opened radially inward,
(D) a detector is mounted in an annular space formed between the stator core and the body of the rotor core;
(E) An outer rotor type brushless motor, wherein the stator includes cooling fins . The rotor core is provided with a bottom wall connected to said hub portion, a peripheral wall surrounding the stator core extending from the bottom wall, and a distal portion in proximity to the stator core at the tip of the peripheral wall, the tip and the stator core 2. The outer rotor type brushless motor according to claim 1, further comprising a labyrinth seal having a narrow gap formed between the tip and the stator .

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