JP2540971Y2 - Ultrasonic motor support structure - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an ultrasonic motor support structure for using an ultrasonic motor that generates a rotational driving force, without affecting the vibration mode characteristics of the ultrasonic motor.
The present invention relates to an ultrasonic motor support structure for stably storing an ultrasonic motor without lowering a rotational driving force.

[0002]

2. Description of the Related Art An ultrasonic motor has a very high electro-mechanical conversion efficiency, and can generate a large driving torque at a constant voltage and at a low speed. Above all, complex oscillator type ultrasonic motors that generate stable rotational torque even at low speed and are easy to control are expected to be used in various fields. FIG. 9 shows a conventional example of an ultrasonic motor supporting structure for housing the composite transducer type ultrasonic motor. The cylindrical composite transducer type ultrasonic motor 62 includes a stator in which a stator bottom 48, a torsional vibrating element 50, a hold block 52, a vertical displacement type piezoelectric element 54, and a stator head 56 are sequentially connected on a central axis 60. It is schematically composed of a head 64 and a rotor 64 that slides. The rotor 64 is also connected to the stator at the center shaft 60. The torsional vibration element 50 is a laminated piezoelectric body made of a piezoelectric material such as lead zirconate titanate or the like, and generates a rotational driving force. The vertical displacement type piezoelectric element 54 acts as a clutch when activated. The rotor 64 is pressed against the stator by a spring 66 at a constant pressure.

[0003] A composite transducer type ultrasonic motor 62 having this configuration
In, the applied voltage of the resonance frequency of the torsional vibration element 50 is applied to the torsional vibration element 50 and the longitudinal displacement type piezoelectric element 54, respectively. Then, torsional vibration occurs in the torsional vibrating element 50 and the longitudinal displacement type piezoelectric element 54 expands and contracts. The combination of these vibrations allows the rotor 64 to rotate continuously in one direction.

The ultrasonic motor supporting structure shown in FIG. 9 has a holder 44 and a pipe 42 in addition to the ultrasonic motor 62.
It is roughly constituted from. Rotor 6 of ultrasonic motor 62
Spokes 58, 58 are provided between the pipe 4 and the pipe 42, and the rotational force of the rotor 64 is transmitted to the pipe 42 via the spokes 58, 58.

Further, a flange 46 is provided at a node of the ultrasonic motor 62 in the torsional vibration mode. The flange 46 is fixed to the holder 44 and supports the ultrasonic motor 62. It is essential that the flange 46 supporting the ultrasonic motor 62 is provided at a node of the torsional vibration mode, and by providing the node at this node, the torsional vibration element 50 is provided.
Without adversely affecting the characteristics of the torsional vibration mode
The ultrasonic motor 62 can be supported. In addition, the node in the torsional vibration mode generally occurs at the edge of the hold block 52 on the torsional vibration element 50 side.

In the ultrasonic motor supporting structure having the above-described structure, when the rotor 64 of the ultrasonic motor 62 rotates, the rotational driving force is transmitted to the pipe 42 via the spoke 58, and the pipe 42 rotates. Therefore, by attaching the object to be supplied with power to the pipe 42, the ultrasonic motor 62
Can be used effectively. For example,
When this ultrasonic motor support structure is provided at the upper end of a window frame and used as a blind wind-up machine, if one end of the blind is attached to the pipe 42, the wind-up of the blind can be performed together with the rotation of the pipe 42. it can.

[0007]

In the ultrasonic motor supporting structure having the above structure, the ultrasonic motor 62 is supported by the flange 46, so that the holder 44 is increased in size in the radial direction by the provision of the flange 46. Would. Further, since the flange 46 needs to be provided at the node of the vibration mode of the ultrasonic motor 62, the holder 44 also becomes large in the length direction in order to store the torsional vibration element 50 and the stator bottom 48. Met. Such a holder 4
The increase in size of 4 is not only poor in appearance when the ultrasonic motor is mounted, but also requires a special installation place for the ultrasonic motor, and the mounting itself is difficult and very inconvenient. In particular, when used as a blind hoist, a gap is formed at the side end of the blind as compared with the window frame.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. By forming a support on a stator, the vibration mode characteristics of the ultrasonic motor are not adversely affected.
It stably supports the ultrasonic motor.

[0009]

SUMMARY OF THE INVENTION An ultrasonic motor supporting structure according to the present invention has an ultrasonic motor, a pipe, and a holder in which a cylindrical stator and a rotor are connected to each other on a central axis, and the ultrasonic motor is connected to a pipe. An ultrasonic motor supporting structure in which the end of a pipe is rotatably mounted on a holder, the large diameter part being fixed to an end of a stator, and a columnar base.
A pillar, formed between the pillar and the large diameter portion that is thinner than the pillar;
A support having a small diameter portion is provided , the end face of the pillar is attached to the inner surface of the holder, and the rotor is fixed to the inner surface of the pipe.

[0010]

According to the ultrasonic motor support structure of the present invention, the support is formed at the end of the stator and the support is fixed to the holder, so that the ultrasonic motor can be stably supported. At this time, by forming the small diameter portion on the support, the influence on the characteristics of the vibration mode of the ultrasonic motor can be reduced. Therefore, the ultrasonic motor can be stably stored in the pipe without adversely affecting the characteristics of the vibration mode.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. The cylindrical composite transducer type ultrasonic motor 40 includes a stator bottom 22, an aluminum ring 23, and a torsional vibration element 24.
, A hold block 26, a vertical displacement type piezoelectric element 28, and a stator in which a stator head 30 is sequentially connected around a central axis 20, and a rotor 34 that slides on the stator head 30. The rotor 34 is also rotatably connected to the stator about the center shaft 20. The torsional vibration element 24 is a laminated piezoelectric body made of a piezoelectric material such as lead zirconate titanate (PZT), and generates a rotational driving force. The vertical displacement type piezoelectric element 28 functions as a clutch when activated. The rotor 34 is pressed against the stator by a spring 36 at a constant pressure.

The composite oscillator type ultrasonic motor 40 of this configuration
In, the applied voltage of the resonance frequency of the torsional vibration element 24 is applied to the torsional vibration element 24 and the longitudinal displacement type piezoelectric element 28, respectively. Then, torsional vibration occurs in the torsional vibration element 24 and the longitudinal displacement type piezoelectric element 28 expands and contracts. By the combination of these vibrations, the rotor 34 can be continuously rotated in one direction.

As shown in FIG. 1, the ultrasonic motor supporting structure according to the present embodiment is generally constituted by a holder 12 and a pipe 10 in addition to an ultrasonic motor 40. Pipe 10
Has an ultrasonic motor 40 housed therein, and the pipe 10 itself rotates under the rotational force of the ultrasonic motor 40. The holder 12 is provided at an end of the pipe 10, and the holder 12 is fixed to a building material or the like where an ultrasonic motor is installed. Also, the pipe 10 and the holder 12
Slides on the sliding portions 14 and 14 and is made of oiles metal or the like. Spokes 32 are provided between the rotor 34 of the ultrasonic motor 40 and the pipe 10, and the rotational force of the rotor 34 is transmitted to the pipe 10 via the spokes 32. The spokes 32 may be of a radial shape centered on the rotor 34 or of an annular shape.

Further, in the ultrasonic motor supporting structure of the present embodiment, the support 16 is provided on the stator bottom 22. Further, the support 16 is bonded to the center of the inner side surface 38 of the holder 12. The support 16 has a cylindrical large-diameter portion.
15, a cylindrical pillar 19, these large diameter parts 15 and a pillar
19, a columnar small diameter smaller than the column 19
And a portion 18 . Stainless steel or the like can be used for the support 16. The support 16 is formed by fixing the stator bottom 2 formed separately from the ultrasonic motor.
In addition to being attached to the end of No. 2, it may be of course integrated with the stator bottom 22. In the configuration of the present embodiment in which the support 16 having the small-diameter portion 18 is interposed between the stator bottom 22 and the inner side surface 38, the node of the vibration mode is formed on the mounting surface of the support 16 with the holder 12, so that the support Even if 16 is fixed to holder 12, the adverse effect on the characteristics of the vibration mode is extremely small. Accordingly, since the characteristics of the vibration mode are not adversely affected, the ultrasonic motor 40 can be stably supported without lowering the rotational driving force.

In the ultrasonic motor supporting structure of this embodiment, when the rotor 34 of the ultrasonic motor 40 rotates, the rotational driving force is transmitted to the pipe 10 through the spokes 32, and the pipe 10 rotates. Therefore, by attaching the object to be supplied with power to the pipe 10, the ultrasonic motor 40
Can be used effectively. For example,
When this ultrasonic motor support structure is installed on the upper end of a window frame and used as a blind wind-up machine, if one end of the blind is attached to the pipe 10, the blind can be wound up with the rotation of the pipe 10. Can be.

In the ultrasonic motor support structure of the present embodiment, unlike the conventional ultrasonic motor support structure, no flange is provided at the node of the vibration mode generated near the hold block, so that the holder 12 is unnecessary and large. It does not change.
That is, most of the ultrasonic motor 40 can be stored inside the pipe 10 and the size of the holder 12 can be reduced. Therefore, the ultrasonic motor support structure of the present embodiment is easy to mount, does not have a gap or the like due to the installation of the ultrasonic motor, and has an improved appearance.

The present invention is a support structure for an ultrasonic motor, and the ultrasonic motor is not limited to the composite oscillator type ultrasonic motor as in the present embodiment. Of course, it can be applied to

(Test Example) The characteristics of the vibration mode of the support 16 under the following various conditions were examined. 2 to 8 shown in the test examples, (a) is a side view of the ultrasonic motor used in each test, (b) is a characteristic diagram of a torsional vibration mode,
(C) is a characteristic diagram of the longitudinal vibration mode. In the characteristic diagram of each vibration mode, the center straight line is the center axis of the vibration mode, the F line is the characteristic of the vibration mode in which the end face of the support is not fixed, and the C line is that the end face of the support is fixed. This is the characteristic of the vibration mode of the state. Furthermore, in the ultrasonic motor used for each test, the stator bottom 22 and the support 16 are integrated.

<Test 1> First, the characteristics of the vibration mode of the ultrasonic motor in a state where the support was not formed were measured. The results are shown in FIG.

As is apparent from FIG. 2, in the ultrasonic motor having no support, a node in the torsional vibration mode is formed on the edge of the hold block 26 on the side of the torsional vibration element 24 (FIG. 2B). The node in the vertical vibration mode is generated in the vertical displacement type piezoelectric element 28 (FIG. 2C), and the stator bottom 22
It can be seen that vibrates greatly. Therefore, it can be seen that fixing the end face 21 of the stator bottom 22 directly to the holder 12 clearly affects the characteristics of the vibration mode of the ultrasonic motor.

<Test 2> The characteristics of each ultrasonic mode of the ultrasonic motor in which the support 19 was not formed with the pillar 19 thicker than the small diameter portion 18 and the ultrasonic motor formed were examined. That is, FIG. 3 shows an ultrasonic motor in which a column 19 having the same thickness as the small diameter portion 18 is formed, and FIG. 4 shows an ultrasonic motor in which a column 19 thicker than the small diameter portion 18 is formed. It is a motor.

3 and 4, the difference between the torsional vibration modes in the state where the end face 17 of the support 16 is not fixed (line F) and the state where the end face 17 is fixed (line C) is larger than that in FIG. It can be seen that the ultrasonic motor of FIG. 4 is smaller than the ultrasonic motor. Further, the difference between the longitudinal vibration modes in the state where the end face 17 of the support 16 is not fixed (line F) and the state where the end surface 17 is fixed (line C) is larger than that of the ultrasonic motor of FIG. Is smaller. That is, it can be understood that the influence of the fixing of the end face 17 of the support 16 on the vibration mode is smaller in the ultrasonic motor of FIG. 4 than in the ultrasonic motor of FIG. In other words, it is understood that the influence on the characteristics of the vibration mode of the ultrasonic motor can be reduced by providing the pillar 19 that is thicker than the small diameter part 18 (in other words, by forming the small diameter part 18 with respect to the pillar 19). .

<Test 3> The dependence of the vibration mode on the length of the small diameter portion 18 of the support 16 was examined. That is, in FIG. 5, the ultrasonic motor has a small diameter portion 18 having a long length, and in FIG. 6, the ultrasonic motor has a small diameter portion 18 having a short length.

As is apparent from FIGS. 5C and 6C, the ultrasonic motor having the small diameter portion 18 of FIG. 5 having a longer length than the ultrasonic motor having the small diameter portion 18 of FIG. It can be seen that the vibration mode characteristics of the state where the end face 17 of the support 16 is not fixed (line F) and the state where the end face 17 of the support 16 is fixed (line C) are similar. That is, it can be seen that the ultrasonic motor in FIG. 5 has less influence on the vibration mode due to the fixing of the end face 17 of the support 16 than the ultrasonic motor in FIG. In other words, the smaller diameter portion 18 is longer than the shorter one,
The effect on the characteristics of the vibration mode when the end face 17 of the support 16 is fixed can be reduced.

<Test 4> The dependence of the vibration mode on the thickness of the small diameter portion 18 of the support 16 was examined. That is, FIG. 7 shows an ultrasonic motor in which the diameter of the small diameter portion 18 is reduced, and FIG. 8 shows an ultrasonic motor in which the thickness of the small diameter portion 18 is increased.

As is clear from both the torsional vibration mode and the longitudinal vibration mode in FIGS. 7 and 8, the ultrasonic motor of FIG. 7 is more effective than the ultrasonic motor of FIG.
It can be seen that the characteristics of the vibration modes in the state where is not fixed (line F) and in the state where it is fixed (line C) are similar. That is, it can be seen that the ultrasonic motor of FIG. 7 is less affected by the fixing of the end face 17 of the support 16 than the ultrasonic motor of FIG. That is, when the small diameter portion 18 is thinner than thicker, the influence on the vibration mode characteristics of the ultrasonic motor can be reduced.

From the above test results, the following four points become clear. By forming a support having a small diameter portion and a pillar at the end of the stator bottom, it is possible to reduce the influence on the vibration mode characteristics of the ultrasonic motor even when the end of the support is fixed to the holder. The larger the column, the smaller the effect on the vibration mode characteristics of the ultrasonic motor when the end surface of the support is fixed. The longer the small-diameter portion, the smaller the influence on the characteristics of the vibration mode of the ultrasonic motor when the end face of the support is fixed. The smaller the small-diameter portion, the smaller the influence on the vibration mode characteristics of the ultrasonic motor when the end face of the support is fixed. In other words, by forming a long support having a large pillar and a small diameter portion at the end of the stator bottom, it is possible to further reduce the influence on the characteristics of the vibration mode of the ultrasonic motor.

[0028]

The ultrasonic motor support structure according to the present invention has an ultrasonic motor, a pipe and a holder in which a columnar stator and a rotor are connected to each other on a central axis, and stores the ultrasonic motor inside the pipe. An ultrasonic motor support structure in which the end of the pipe is rotatably mounted on the holder, and the end of the stator has a large diameter portion, a column, and a larger column than the column between the large diameter portion and the column. A substantially cylindrical support having a thin small diameter portion is formed, the end surface of the column is attached to a holder, and the rotor is fixed to the inner surface of the pipe.

In the structure in which the support having the small diameter portion is interposed between the stator and the holder to support the ultrasonic motor, the ultrasonic motor can be operated in such a manner that the influence on the vibration mode characteristics of the ultrasonic motor is minimized. Can be stably supported. And since it is not necessary to provide a support member such as a flange on the ultrasonic motor, and most of the ultrasonic motor can be stored in the pipe, the size of the support structure itself of the ultrasonic motor can be reduced. it can. Therefore, not only can the installation place at the time of installation be reduced, but also the installation itself becomes easy. Also, the appearance is significantly improved.

[Brief description of the drawings]

FIG. 1 is a side view of an ultrasonic motor support structure according to the present embodiment.

FIG. 2A is a graph showing a characteristic result of a vibration mode in Test 1, and FIG.
FIG. 2 is a side view of the ultrasonic motor used in Test 1, and FIG.
(B) is a characteristic result of the torsional vibration mode of Test 1;
FIG. 2C shows the characteristic result of the longitudinal vibration mode of Test 1.

FIG. 3 shows the results of the characteristics of the vibration mode in Test 2;
FIG. 3 is a side view of the ultrasonic motor used in Test 2, and FIG.
(B) is a characteristic result of the torsional vibration mode of the test 2,
FIG. 3C shows the characteristic result of the longitudinal vibration mode in Test 2.

FIG. 4 (a) is a graph showing a characteristic result of a vibration mode in test 2;
FIG. 4 is a side view of the ultrasonic motor used in Test 2, and FIG.
(B) is a characteristic result of the torsional vibration mode of the test 2,
FIG. 4C shows the characteristic result of the test 2 in the longitudinal vibration mode.

FIG. 5 (a) shows the results of the vibration mode characteristics of test 3.
5 is a side view of the ultrasonic motor used in Test 3, and FIG.
(B) is a characteristic result of the torsional vibration mode of the test 3;
FIG. 5C shows the characteristic result of the test 3 in the longitudinal vibration mode.

6A and 6B show the results of characteristics of the vibration mode in Test 3; FIG.
6 is a side view of the ultrasonic motor used in Test 3, and FIG.
(B) is a characteristic result of the torsional vibration mode of the test 3;
FIG. 6C shows the characteristic result of the test 3 in the longitudinal vibration mode.

FIG. 7 (a) is a graph showing the characteristic results of the vibration mode in test 4;
7 is a side view of the ultrasonic motor used in Test 4, and FIG.
(B) is a characteristic result of the torsional vibration mode of the test 4;
FIG. 7C shows the characteristic result of the test 4 in the longitudinal vibration mode.

8A and 8B show the results of characteristics of the vibration mode in Test 4; FIG.
8 is a side view of the ultrasonic motor used in Test 4, and FIG.
(B) is a characteristic result of the torsional vibration mode of the test 4;
FIG. 8C shows the characteristic result of the longitudinal vibration mode of Test 4.

FIG. 9 is a side view of a conventional ultrasonic motor support structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Pipe 12 Holder 16 Support body 17 End face 18 Small diameter part 19 Column 20 Center axis 22 Stator bottom 24 Torsional vibration element 28 Vertical displacement type piezoelectric element 34 Rotor 38 Inner side surface 40 Ultrasonic motor 42 Pipe 44 Holder 46 Flange 48 Stator bottom 50 Torsion Vibration element 54 Vertical displacement type piezoelectric element 58 Spoke 60 Central axis 62 Ultrasonic motor 64 Rotor

Claims (1)

(57) [Scope of request for utility model registration] An ultrasonic motor having a cylindrical stator and a rotor connected to each other on a central axis, a pipe and a holder, the ultrasonic motor is housed inside the pipe, and an end of the pipe is rotated by the holder. An ultrasonic motor support structure that is freely mounted, and has a large-diameter portion fixed to the end of the stator, and a cylindrical shape.
Formed between the pillar and a large diameter portion smaller than the pillar and the pillar.
An ultrasonic motor supporting structure , comprising: a support having a small diameter portion , wherein an end surface of the column is attached to an inner surface of the holder, and a rotor is fixed to an inner surface of the pipe.