JPH069389U - Vibration motor device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a vibration motor capable of rotating in both directions, having a simple structure, and capable of efficiently generating a rotation output. A vibration motor having a stator section 40 and a rotor section. The stator part 40 includes piezoelectric elements 42, 4
4, the electrode plates 46 and 48, and a first block body 50 and a second block body 52 arranged so as to sandwich both sides of the electrode plates and the piezoelectric element. Then, a three-phase AC voltage having a resonance frequency of bending vibration is applied to the divided electrode plates 46U, 46V, 46W. As a result, forward and reverse elliptical vibrations are arbitrarily generated on the rotor contact surface 60, and the rotor portion is driven in the forward and reverse directions. Since the rotor contact surface 60 is formed to have a larger diameter than the other portions, it is possible to increase the amount of vertical displacement of the elliptical vibration generated in the rotor contact surface 60. A motor can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vibration motor device.

[0002]

[Prior art]

 BACKGROUND ART Bolt-tightening Langevin type ultrasonic motors have been well known in the past, for example, a piezoelectric motor using a cantilever-shaped torsion ultrasonic transducer disclosed in Japanese Patent Publication No. 61-49670, and Japanese Patent Laid-Open No. 63-217984. Ultrasonic motors and the like according to the publication are known.

However, in the conventional motors of this type, there is a problem that the rotor can rotate only in one direction, and the structure is complicated and expensive.

FIG. 16 shows an example of a conventional bolted Langevin type ultrasonic motor. In this ultrasonic motor, metal block bodies 14 and 16 having different lengths are arranged at both ends of two piezoelectric elements 10 and 12, and both block bodies 14 and 16 have a piezoelectric element by a bolt 18 at the center thereof. It is fixed so that 10 and 12 are tightened.

In this ultrasonic motor, when a high-frequency AC voltage is applied from the AC power source 20 to the piezoelectric elements 10 and 12, longitudinal vibration occurs due to vibration in the thickness direction of the piezoelectric elements 10 and 12, and the bolt 18 twists. As a result, torsional vibrations are generated, and elliptical vibrations that are a combination of longitudinal vibrations and torsional vibrations are generated on the end faces of the block bodies 14 and 16. This elliptical vibrations can provide a rotational driving force.

On the end surface of the block body 16, a disc 22 is arranged so as to be urged toward the block body 16 by a spring 24, and a rotary shaft 26 of the disc 22 is supported by a bearing 28. . Therefore, by bringing the disc 22 into contact with the end face of the block body 16, the rotational force obtained by the combined vibration is transmitted to the disc 22 and the rotational output can be taken out from the rotary shaft 26.

[0007]

[Problems to be solved by the device]

 However, in the conventional ultrasonic motor, the rotational output cannot be effectively generated unless the resonance points of the longitudinal vibration and the torsional vibration are matched. For this reason, it is necessary to form one block body 14 in a short shape and form the other block body 16 in a long shape to match the resonance points. Therefore, there is little freedom in designing the motor. There was a problem.

Further, in the ultrasonic wave motor that generates elliptical vibration by combining longitudinal vibration and torsional vibration in this way, only one direction of elliptical vibration can be generated on the end surface of the block body 16, and the rotating shaft 26 is rotated in the normal direction. There was a problem that it could not be driven in both the reverse and reverse directions.

Furthermore, in this ultrasonic motor, elliptical vibration cannot be directly generated from the vibrations of the vibrators 10 and 12, and since longitudinal vibration and torsional vibration must be combined, the elliptic vibration generation efficiency is not sufficient. Therefore, there was a problem that the rotation output could not be generated efficiently.

The present invention has been made in view of the above conventional problems, and an object thereof is to enable vibration in a bidirectional direction, have a simple structure, and efficiently generate a rotation output. It is to provide a motor device.

[0011]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a vibration motor device including a vibration motor having a stator part and a rotor part, and a control circuit for driving the vibration motor, wherein the stator part generates vibration. A piezoelectric element, an electrode that divides the surface of the piezoelectric element into at least three parts in the rotation direction of the rotor portion, and uses each divided area as a different voltage application area, and a first electrode that is attached and fixed to both sides of the piezoelectric element so as to sandwich the piezoelectric element. And a second block body, wherein the control circuit has three or more phases having a resonance frequency of bending vibration or a frequency in the vicinity thereof in each voltage application region of the piezoelectric element via the electrode. It is formed to apply an AC voltage, and by switching the phase sequence of this AC voltage, forward and reverse elliptical vibrations are generated on the rotor contact surface of the block body. It is formed so as to drive the rotor portion in contact with the rotor contact surface in forward and reverse directions. The stator portion is formed by enlarging the rotor contact surface side in the outer peripheral direction, and the rotor contact surface is normally formed on the stator portion. It is characterized in that it is formed larger than the cross section.

[0012]

[Action]

 In the present invention, the surface of the piezoelectric element is divided into at least three parts along the rotation direction of the rotor part, and the electrodes are formed so that each area is a voltage application area of a different phase. Therefore, by applying a high-frequency AC voltage of three or more phases to each voltage application region of the piezoelectric element via the electrodes, elliptical vibration is directly generated on the rotor contact surface of the block body, and the rotor part is rotationally driven. can do.

As described above, in the vibration motor of the present invention, unlike the conventional Langevin type ultrasonic motor, the elliptical vibration can be directly generated from the vibration of the piezoelectric element without using the torsional vibration by the bolt. The rotation output can be obtained efficiently, and since there is no design constraint that the resonance points of longitudinal vibration and torsional vibration are made to coincide with each other as in the conventional case, the configuration of the entire motor becomes simple and inexpensive.

In particular, according to the present invention, since the rotor contact surface formed on the outer end surface of the block body is formed to have a diameter larger than that of other portions, the elliptical vibration generated in the rotor contact surface in the longitudinal direction is The amount of displacement can be increased. Therefore, it is possible to obtain a slender, high-output vibration motor.

Further, according to the present invention, the elliptical vibration in the forward direction and the elliptic vibration in the reverse direction are selected on the rotor contact surface of the block body by switching the phase sequence of the high frequency AC voltage applied to each of the voltage application regions. The rotor can be driven forward and backward.

In addition to this, in the present invention, by using an AC voltage having a resonance frequency of bending vibration as the AC voltage of three or more phases, the input voltage is efficiently converted into a rotation output, and the rotor part is rotated. Can be driven to rotate.

Further, the present inventor examined the principle of rotation of this vibration motor. In this type of motor, longitudinal vibration, torsional vibration, and bending vibration are known as the types of vibration that occur. In the conventional bolted Langevin type ultrasonic motor, elliptical vibration was generated by combining longitudinal vibration and torsional vibration, but in the vibration motor of the present invention, elliptical vibration is directly generated using bending vibration. It is estimated that That is, bending vibration is generated in the block body due to the vibration of the piezoelectric element, but in the present invention, by applying a high frequency AC voltage of three phases or more to each voltage application region of the piezoelectric element, It is presumed that the bending vibration is directly obtained as elliptical vibration.

As described above, it is estimated that the vibration motor of the present invention obtains elliptical vibration based on a principle different from that of the conventional Langevin type ultrasonic motor, and as a result, the rotation output capable of forward and reverse rotation is efficiently generated. In addition, the structure is simple and inexpensive.

In addition to this, in the vibration motor of the present invention, an AC voltage having the same frequency as the resonance frequency of bending vibration generated in the stator is applied. For this reason, the abdomen having the largest bending vibration value is located on the rotor contact surface of the block body, and from this surface as well, the input voltage is efficiently converted into the rotational output, and the rotor is rotationally driven. be able to.

FIG. 7 conceptually shows a state of bending vibration generated in the stator part. The figure (A) shows the situation when the stator part is resonantly driven by an AC voltage of one resonance frequency, and the figure (B) shows the case where the stator part is driven by an AC voltage of a secondary resonance frequency. The state is shown in FIG. 6C, and the state in which the stator portion is driven by an AC voltage having a third resonance frequency is shown.

As shown in the figure, in the vibration motor of the present invention, bending vibration can be used to generate elliptical vibration directly on the rotor contact surfaces 60A and 60B of the stator part. Then, when the stator portion is driven by the primary resonance, elliptical vibrations in the same direction are generated in both rotor contact surfaces 60A and 60B, and when the stator portion is driven by the secondary resonance, both rotor contact surfaces 60A and 60B are driven. , 60B generate reverse elliptical vibrations, and when the stator section is driven by third resonance, it is possible to generate elliptical vibrations in the same direction on both rotor contact surfaces 60A, 60B.

At this time, according to the present invention, as shown in FIG. 6, since the rotor contact surface 60 of the stator portion is formed to be larger in diameter than the other portions, the rotor contact surface 60 can be formed in the vertical direction. The displacement amount can be expanded as shown from d1 to d2, and as a result, a vibration motor of high output can be obtained even with a slender body.

[0023]

【Example】

 Next, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a first preferred embodiment of the vibration motor according to the present invention.

The vibration motor of the embodiment has a rotor portion 30 and a stator portion 40.

Then, by applying a high-frequency AC voltage from the control circuit 80 to the electrode plates 46, 48 of the stator section 40, elliptical vibration is generated on the rotor contact surface 60 of the stator section 40, and as a result, the rotor contact surface is generated. The rotor portion 30 which is in contact with the rotor 60 is driven in the forward and reverse directions.

The rotor unit 30 includes a disc 32 that comes into contact with the rotor contact surface 60 at a constant pressure, and a rotation output shaft 34 attached to the center of rotation of the disc 32.

The stator portion 40 is provided on both sides of the two piezoelectric elements 42 and 44, which are formed in a ring shape by using a piezoelectric material such as ceramics and have different polarization directions from each other, and the piezoelectric element 44. A first electrode plate 46 and a second electrode plate 48, a first metal block body 50 and a second metal block body 52 respectively arranged on both sides of the piezoelectric elements 42 and 44, and both metal block bodies. A connecting bolt 55 for connecting and fixing 50 and 52 so as to tighten the piezoelectric elements 42 and 44 is formed, and is formed in a vertically long shape as a whole.

A large-diameter flange portion 54 is formed on the outer end surface side of the first metal block body 50, so that the rotor contact surface 60 has a radius larger than that of other portions of the stator portion 40. It is formed so as to become larger in the direction.

By thus forming the rotor contact surface 60 in the radial direction to be larger than the cross section of the other portion of the stator portion 40, as shown in FIG. 6, the elliptical vibration generated in the rotor contact surface 60 in the vertical direction is generated. The displacement amount d can be expanded to d2 as compared with the displacement amount d1 when the flange 54 is not formed, and a slender and high-power motor can be realized. That is, in order to obtain a vibration motor in which the vertical displacement of the elliptical vibration is d2 as in the embodiment, the entire stator section 40 is usually made to have a cross section of substantially the same shape as the flange section 54. Since it has to be formed, the whole stator part becomes thick and heavy. On the other hand, in the present embodiment, by forming the flange portion 54 only on the end face side of the stator portion 40, it is possible to realize a slim and lightweight motor with high output.

As the piezoelectric elements 42 and 44, for example, those obtained by polishing and removing the surfaces of silver and nickel used as electrodes during polarization after the polarization is completed are used.

The stator 40 is shown in FIGS. 2 and 3.

Here, FIG. 2 shows a state in which the stator portion 40 is assembled, and FIG. 3 shows an exploded perspective view thereof.

A screw hole is formed at the center of each of the first and second metal block bodies 50 and 52, and further, the piezoelectric element 42, the first electrode plate 46, the piezoelectric element 44, and the second electrode plate 48. Bolt insertion holes 42a, 46a, 44a, 48a are provided at the center of the. Then, the coupling bolt 55 having the insulating collar 56 inserted therein is inserted into the bolt insertion holes 42a, 46a, 44a, 48a, and the screw portions provided at both ends of the coupling bolt 55 are attached to the first and second bolts. The metal block bodies 50 and 52 are screwed into the screw holes formed in the center. As a result, the first metal block body 50 and the second metal block body 52 are connected and fixed to both ends of the piezoelectric elements 42 and 44 so as to tighten the piezoelectric elements 42 and 44.

In this embodiment, since no adhesive is used to fix the laminated surface of each member at the time of connecting and fixing, it is possible to prevent variations in resonance frequency among motors and decrease in Q value. Therefore, the performance and reliability of the vibration motor can be improved.

Further, the first electrode plate 46 is provided with slit portions 46c so as to be divided into three in the circumferential direction, and the outer peripheral portions thereof are connected to each other by a connecting portion 46b. The diameter of the first electrode plate 46 is formed to be slightly larger than the diameters of the piezoelectric elements 42 and 44, and when the stator portion 40 is assembled, its outer peripheral portion and the connecting portion 46b project to the outside of the stator. It is like this. Thus, after the assembly of the stator part 40 is completed, the connecting part 46b is cut to obtain the split electrode plates 46U, 46V, 46W electrically insulated from each other.

In particular, in the present embodiment, since the divided electrode plates 46U, 46V, 46W can be handled as one electrode plate 46 at the time of assembling the stator, not only the assembling work becomes easy, but also the divided electrodes are separated. Positioning of the electrode plates 46U, 46V, 46W can be performed accurately.

Further, as shown in FIG. 2, the portion of each divided electrode plate 46U, 46V, 46W protruding to the outside of the stator constitutes an external connection terminal 45U, 45V, 45W, which is shown in FIG. Thus, the lead lines 64U, 64V, 64W will be connected.

Further, on the outer periphery of the second electrode plate 48, an external connection terminal 49 protruding to the outside of the stator portion 40 is provided, and a lead wire 66 for grounding is provided on the external connection terminal 49, as shown in FIG. Will be connected.

Further, the metal block bodies 50 and 52 of the present embodiment are connected and fixed to each other by a metal coupling bolt 55. Therefore, when the second electrode plate 48 is grounded, the second metal block body 52, the coupling bolt 55, and the first metal block body 50 automatically become the ground potential. Therefore, the first metal block body 50 functions as a ground electrode for one surface of the piezoelectric element 42, similarly to the second electrode plate 48.

The coupling bolt 55 is electrically insulated from the piezoelectric elements 42, 44 and the first electrode plate 46 by an insulating collar 56.

When the rotor unit 30 is normally driven by using the vibration motor configured as described above, the second electrode plate 48 is grounded and the divided electrode plates 46U, 46V, 46W are shown in FIG. A three-phase AC voltage of A phase, B phase, and C phase is applied. As a result, vibrations corresponding to the high-frequency AC voltages of the A-phase, B-phase, and C-phase are generated in the voltage application regions of the piezoelectric elements 42, 44 in contact with the divided electrode plates 46U, 46V, 46W, respectively, and Forward elliptical vibration is generated on the contact surface 60. It is estimated that this elliptical vibration is obtained as a combination of bending vibrations generated corresponding to the high-frequency AC voltages of the A-phase, B-phase, and C-phase, whereby the rotor portion 30 in contact with the rotor contact surface 60 moves in the forward direction. It will be driven to rotate.

When the phase order of each of the divided electrode plates 64U, 64V, 64W is switched and a three-phase AC voltage is applied in the order of A phase, C phase, and B phase, an elliptical vibration in the reverse direction is generated on the rotor contact surface 42. Then, the rotor portion 30 can be rotationally driven in the opposite direction.

As described above, according to the present embodiment, the rotor portion 30 can be driven in the normal rotation and the reverse rotation by switching the phase order of the three-phase AC voltage applied to the divided electrode plates 64U, 64V, 64W. it can. Moreover, since elliptical vibration can be directly generated on the rotor contact surface 60 without the need for torsional vibration, the structure of the motor can be simplified and the rotational output can be efficiently generated.

By the way, in order to drive the vibration motor of the present embodiment more efficiently, it is preferable to set the frequency of the alternating voltage to a value (resonance frequency) at which the stator section 40 causes a resonance phenomenon. .

FIG. 5 shows the state of resonance of bending vibration generated in the stator portion 40.

As is clear from the figure, the frequency of the AC voltage is set to the resonance frequency of the bending vibration generated in the stator section 40, for example, the primary resonance frequency, the secondary resonance frequency, the tertiary resonance frequency or the like. By doing so, it is possible to position the antinodes of the vibration that maximize the bending vibration on both end surfaces 60A and 60B of the stator portion 40. As a result, the elliptic vibration generated on both end surfaces 60a and 60b of the stator 40 can be maximized, and thereby the rotational output efficiency can be improved.

The resonance frequency may be any resonance frequency.

FIG. 7 shows a resonance model of the stator section 40 when the frequency of the AC voltage is set to the primary resonance frequency, the secondary resonance frequency and the third resonance frequency.

At this time, elliptical vibrations in the same direction appear on both end surfaces 60A, 60B of the stator 40 when the resonance frequency is set to an odd mode, and when the resonance frequency is set to an even mode. Elliptical vibration in the opposite direction will be generated.

Here, the resonance frequency f of the bending vibration in each of these models can be roughly calculated by the following equation.

F = λ ² {R / (2πL ² )} (E / ρ) ^1/2 λ; constant (4.73 at the first resonance, 7.853 at the second resonance, 10.996 at the third resonance) R; 0.25 × D (D is the outer diameter of the stator section 40) L; Total length of the stator section 40 (E / ρ) ^1/2 ; Sound velocity (E is Young's modulus, ρ is density) FIG. A specific configuration of the control circuit 80 for controlling the operation of is shown.

The control circuit 80 amplifies this three-phase AC output and supplies it to the divided electrode plates 46U, 46V, 46W, and a power supply circuit 90 for outputting the three-phase AC voltage of A-phase, B-phase, and C-phase. And an amplifier 92.

The control circuit 80 also includes an ON / OFF switch 82, a resonance mode input section 84, a rotation direction input section 86, and a rotation speed input section 88.

The ON / OFF switch 82 controls on / off of the power supply circuit 90 and the amplifier 92.

The resonance mode input section 84 selectively sets the resonance mode of the stator section 40, and its output signal is input to the power supply circuit 90. Then, based on this input signal, the power supply circuit 90 controls the switching of the frequency of the three-phase AC output voltage to the resonance frequency of the set resonance mode, whereby the bending vibration of the stator section 40 is changed to the primary resonance, 2 It is possible to set the resonance mode of the second resonance or higher.

The rotation direction input unit 86 selectively sets the rotation direction of the rotor unit 60, and its output signal is input to the power supply circuit 90. Based on this input signal, the power supply circuit 90 can switch the phase order of the three-phase AC voltage applied to each of the divided electrode plates 46U, 46V, 46W to determine the rotation direction of the rotor section 60.

Further, the rotation speed input unit 88 can set the rotation speed of the rotor unit 60 by controlling the amplification factor of the amplifier 92. FIG. 9 schematically shows a cross-sectional structure when the vibration motor of the embodiment is attached to a housing and commercialized.

In the vibration motor of the embodiment, the housing 100 is attached and fixed to the support portion 102 provided on the side surface of the first metal block body 50 of the stator portion 40. The support portion 102 is provided at a node of vibration generated in the stator portion 40.

Further, in the rotor portion 30 of the embodiment, the disc 32 thereof is brought into pressure contact with the rotor contact surface 60 of the stator portion 40 by the leaf spring 104 and the plate 106. A rotation output shaft 34 is fixed to the disc 32 by a C ring (not shown), and the rotation output shaft 34 also rotates when the disc 32 rotates.

As described above, in the vibration motor of the embodiment, only the large-diameter flange portion 54 is provided on the rotor contact surface of the stator portion 40, and the other portions are elongated in the vertical direction. Therefore, it is possible to realize a small and high-power vibration motor as a whole.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.

For example, in the above-described embodiment, the case where the flange portion 54 is formed in a disc shape has been described as an example, but the present invention is not limited to this, and the flange portion may be formed in various shapes as necessary. it can.

For example, as shown in FIG. 10, a plurality of protrusions 70 are formed on the outer peripheral side of the rotor contact surface 60 at regular intervals along the circumferential direction, and the protrusions 70 are brought into contact with the rotor portion 30. You may By doing so, the amplitude of the elliptical vibration generated at the contact position between the rotor contact surface 60 and the rotor portion 30 can be increased, and the rotational output can be improved. Furthermore, it is possible to block the acoustic impedance between the rotor section 30 and the stator section 40.

Further, the flange portion 54 may be formed so that its cross section has a tapered shape as shown in FIG. 11, and as shown in FIG. 12, it has a predetermined thickness so as to project in the circumferential direction. You may form.

FIG. 13 shows a sectional structure when the housing 100 is attached to the vibration motor shown in FIG. 12 to manufacture the product. Even in this case, it is preferable that the housing 106 is attached to the stator portion 40 at a node of vibration generated in the stator portion 40.

Further, in the present embodiment, the case where the first electrode plate 46 is divided into three has been described as an example, but the present invention is not limited to this, and the first electrode plate 46 may be provided in any number of 3 or more. It may be formed separately on the divided electrode plate.

FIG. 14 shows a modified example of such a divided electrode plate.

FIG. 9A shows an example of a structure in which the first electrode plate 46 is divided into three parts, as in the above embodiment.

FIG. 7B shows a specific example in which the first electrode plate 46 is divided into four, and four-phase AC voltages of 90 ° phase different from each other are applied from the control circuit 80.

FIGS. 7C, 7D, and 7E are specific examples in which the first electrode plate 46 is divided into six parts. Here, FIGS. 7C and 7D are specific examples of a method of applying a three-phase AC voltage to each of the six divided electrode plates. Further, FIG. 6E is a specific example of the case where a six-phase AC voltage is applied to each of the six divided electrode plates.

Further, FIG. 15 shows a specific example in which the first electrode plate 46 is divided into nine parts.

Here, (A), (B), and (C) of the same figure are specific examples in the case of applying a three-phase AC voltage to each divided electrode plate by different connection methods.

Further, FIG. 6D is a specific example in the case of applying a 9-phase AC voltage to the 9 divided electrode plates.

As described above, in the vibration motor of this embodiment, the first electrode plate 46 is divided into three or more divided electrode plates, and an AC voltage of three phases or more is applied to each divided electrode plate. The rotor unit 30 can be rotationally driven.

Further, in the above-described embodiment, the case where the rotor portion 30 is provided only on one end surface 60A of the stator portion 40 has been described as an example, but the present invention is not limited to this, and both end surfaces 60A of the stator portion 40, You may make it provide a rotor part in 60B. As a result, two rotation outputs can be simultaneously extracted from the vibration motor of the practical example, and as is clear from the resonance model shown in FIG. The rotation outputs of both rotors can be set in the opposite directions by setting the rotation directions of the two to the same direction and setting the vibration mode to the odd mode.

Further, according to the above-mentioned embodiment, the case where the coupling bolt 55 is used for connecting and fixing the block bodies 50 and 52 has been described as an example, but in the present invention, like the conventional Langevin type ultrasonic motor, Since the torsional vibration is not necessary, the block members 50 and 52 may be connected and fixed by using a connecting member other than the connecting bolt 55.

The ultrasonic motor according to the present invention can be widely used in various fields. Particularly, since the motor body is slender and high output can be obtained, the ultrasonic motor is suitable for, for example, a motor for power steering. Become.

[0079]

[Effect of device]

 As described above, according to the present invention, it is possible to provide a vibration motor device that can rotate in both directions, has a simple structure, and can efficiently generate a rotation output.

In particular, according to the present invention, the rotor contact surface of the stator portion is formed to have a diameter larger than that of the other portion, and the longitudinal component of the elliptical vibration generated on the rotor contact surface is increased. There is an effect that it is possible to obtain a slim and high-power vibration motor.

Further, according to the present invention, since it is formed so as to apply an AC voltage of three or more phases having a resonance frequency of bending vibration or a frequency in the vicinity thereof to each voltage application region of the piezoelectric element, it is generated. Since the antinode of the bending vibration coincides with the rotor contact surface of the stator, a large rotation output can be efficiently obtained with low power consumption.

[Brief description of drawings]

FIG. 1 is an overall explanatory view of a first preferred embodiment of a vibration motor device according to the present invention.

FIG. 2 is a schematic perspective explanatory view showing a stator portion of the vibration motor shown in FIG.

FIG. 3 is an exploded perspective view of a stator portion shown in FIG.

FIG. 4 is an explanatory diagram of a three-phase AC voltage applied to the vibration motor of the embodiment.

FIG. 5 is an explanatory diagram of resonance bending vibration generated in a stator portion.

FIG. 6 is a conceptual diagram showing vibration of a stator portion.

FIG. 7 is a conceptual diagram showing a resonance model of a stator section.

8 is a block diagram of a control circuit used in the vibration motor device shown in FIG.

FIG. 9 is an explanatory diagram showing an example of a vibration motor in which a housing is assembled.

FIG. 10 is an explanatory diagram showing a modified example of the stator portion.

FIG. 11 is an explanatory diagram showing a modified example of the stator portion.

FIG. 12 is an explanatory diagram showing a modified example of the stator portion.

FIG. 13 is an explanatory diagram showing another example of the vibration motor in which a housing is assembled.

FIG. 14 is an explanatory view of another embodiment of the split electrode plate used in the present invention.

FIG. 15 is an explanatory view of another embodiment of the divided electrode plate used in this embodiment.

FIG. 16 is an explanatory diagram of a conventional bolted Langevin type ultrasonic motor.

[Explanation of symbols]

 30 rotor part 40 stator part 42 piezoelectric element 44 piezoelectric element 46 first electrode plate 46U, 46V, 46W split electrode plate 48 second electrode plate 50 first metal block body 52 second metal block body 54 flange portion 60 Rotor contact surface 80 Control circuit

Claims (1)

[Scope of utility model registration request] 1. A vibration motor device comprising a vibration motor having a stator portion and a rotor portion, and a control circuit for driving the vibration motor, wherein the stator portion includes a piezoelectric element for generating vibration, and a piezoelectric element for generating vibration. An electrode whose surface is divided into at least three parts in the rotation direction of the rotor part, each divided region being a different voltage application region, and a first block body and a second block which are attached and fixed on both sides so as to sandwich the piezoelectric element. A body, and the control circuit is formed so as to apply an AC voltage of three or more phases having a resonance frequency of bending vibration or a frequency in the vicinity thereof to each voltage application region of the piezoelectric element via the electrode, Moreover, by switching the phase sequence of this AC voltage, forward and backward elliptical vibrations are arbitrarily generated on the rotor contact surface of the block body, and this rotor is rotated. It is formed so that the rotor portion in contact with the contact surface is driven to rotate in the forward and reverse directions. Characteristic vibration motor device.