CN203261259U - Bilateral rotation ultrasonic motor driven by single electric signal - Google Patents

Abstract

The utility model discloses a bilateral rotation ultrasonic motor driven by single electric signals; the motor comprises two identical stators, a rotor and a positive pressure pretightening force adjusting mechanism; the stator comprises a mandrel, and a rear cover, piezoelectric ceramics sheets, electrode sheets, and an oval vibration modal converter sleeved on the mandrel in sequence; the rotor comprises a friction disc and a bearing; and the positive pressure pretightening force adjusting mechanism comprises a spring and a support structure. The oval vibration modal converter structure is specially designed; oval locus motions of stator driving teeth end face mass points are realized through vertical vibration of the piezoelectric ceramics sheets; and the two stators respectively work to drive the rotor for bilateral continuous rotation motions. The bilateral rotation ultrasonic motor driven by single electric signals is simple in structure, easy to make, easy to be miniaturized and integrated, low in cost, small in control difficulty, and wide in application prospect.

Description

A kind of single-electrical signal drives the bidirectional rotation ultrasound electric machine

Technical field

The utility model relates to the ultrasound electric machine field that utilizes the piezoelectric ceramic inverse piezoelectric effect, especially relates to a kind of single-electrical signal and drives the bidirectional rotation ultrasound electric machine.

Background technology

Rotary ultrasonic motor is a kind of novel electrical micro-machine that develops rapidly and use the eighties in 20th century, to utilize the inverse piezoelectric effect of piezoelectric to realize the electric coupling apparatus that electric energy-mechanical energy is changed, by the rubbing action between stator and the rotor, the macroscopic view that elastomeric micro breadth oscillation is converted to rotor rotatablely moves, and directly drives load.The problems such as in the existing rotary-type ultrasound electric machine, the ubiquity driving moment is little at present, and axially volume wearing and tearing difference in internal-and external diameter contact zone large, rotor is large, functional reliability is low.

Single-electrical signal driven-mode conversion hysteria ultrasound electric machine also is a kind of of ultrasound electric machine, and it is the driving that utilizes one group of piezo ceramic element, and the MODAL TRANSFORMATION OF A device by special construction produces stator to have the complex vibration of two kinds of mode of oscillation components.If exist certain phase difference and frequency close between these two mode of oscillations, the end face particle of stator will produce the elliptical orbit vibration on stator and the rotor contact interface, thereby obtains motion and the moment of torsion of rotor by the friction between stator and the rotor.

Be CN101860259A at publication number, denomination of invention is in the patent documentation of " single-electrical signal-stimulated rotation ultrasonic motor ", disclosing a kind of utilization utilizes window shape dislocation MODAL TRANSFORMATION OF A device that the extensional vibration that the sandwich piezoelectric vibrator produces is converted to driving gear particle elliptical vibration, and then the ultrasound electric machine of driving rotor rotation, this invention control-driven system is simple, assembling easily, but its window shape dislocation MODAL TRANSFORMATION OF A device manufacture difficulty is larger, production cost is higher, and it can only carry out single direction rotation, and these problems have restricted its promotion and application in industrial production.

Be CN101030740A at publication number, denomination of invention is in the patent documentation of " bending-rotation ultrasonic motor of single-phase driving ", the structure that discloses a kind of body is the single-phase driving standing wave rotary ultrasonic motor of taper, this motor relies on six piezoelectric ceramic pieces that are superimposed together vertically to excite the vibration of stator, and six piezoelectric ceramic pieces rely on clamp nut and last item cover to be fixed on the axis.Although this motor has the advantages such as output torque is larger, but its complex structure, and in the compaction process of piezoelectric ceramic piece, misplace because the screw (revolving force) of clamp nut very easily causes between the piezoelectric ceramic piece, be difficult to guarantee the specification requirements of dislocation 60 degree between the adjacent piezoelectric ceramic piece; In addition, be not with any positioner between this motor stator and the rotor, this and then affects the stability of motor torque and speed so that stator and rotor contact position precision between the two is affected; There is complex structure in this type of rotary ultrasonic motor, and difficulty make to be installed, and cost is higher, the problems such as poor stability of motor torque and speed.

Summary of the invention

For overcoming the deficiency that exists in the existing Ultrasonic Motor Techniques, the purpose of this utility model is to provide a kind of novel single-electrical signal to drive the bidirectional rotation ultrasound electric machine.

A kind of single-electrical signal drives the bidirectional rotation ultrasound electric machine, comprise two identical stators, rotor and a cover malleation prefastening force adjustment mechanism, it is characterized in that: stator comprises axle and is set in successively back shroud, piezoelectric ceramic piece, electrode slice, elliptical vibration MODAL TRANSFORMATION OF A device on the axle, and axle and elliptical vibration MODAL TRANSFORMATION OF A device are fixed back shroud, piezoelectric ceramic piece, electrode slice and elliptical vibration MODAL TRANSFORMATION OF A device after by thread connection.Stationary part also is the power conversion part of ultrasound electric machine simultaneously, the ultrasonic electric energy of ultrasonic-frequency power supply output is converted to the ultrasonic vibrational energy of stationary part.

Described elliptical vibration MODAL TRANSFORMATION OF A device is integrated, comprise the barrel portion of lower end and the driving gear part of upper end, described driving gear part is in the uniform upper end that is arranged on barrel portion of circumferencial direction, each driving gear is the list structure that both sides offer three rectangular indentation that are dislocatedly distributed, and described driving gear quantity is 3-12.The purpose that the driving gear both sides arrange rectangular indentation is in order to change the mode of oscillation of elliptical vibration MODAL TRANSFORMATION OF A device, make its extensional vibration model frequency and flexural vibration mode frequency approaching or equal, when ultrasonic vibrational energy is delivered to elliptical vibration MODAL TRANSFORMATION OF A device driving gear end from stationary part after, be converted to extensional vibration and the compound vertical curved composite ultrasonic elliptical vibratory of flexural vibrations with certain phase difference, namely be converted to elliptical vibration MODAL TRANSFORMATION OF A device driving gear end along the tangential vertical curved composite ultrasonic elliptical vibratory of ultrasound electric machine circumference.

Rotor comprises frictional disk and bearing, and bearing is arranged on frictional disk inside; The malleation prefastening force adjustment mechanism comprises spring and supporting construction, and the ring flange of one section on spring and a stator is fixed, and the other end and supporting construction are fixed.

Two coaxial settings of stator, drive increment all towards frictional disk and contact with frictional disk, one of them stator is fixed by ring flange, and another stator is connected the end connection by ring flange with spring, supporting construction is connected in the spring other end, forms the malleation pretightning force between two stators and rotor.

Further, described elliptical vibration MODAL TRANSFORMATION OF A device driving gear end is bonded with the A friction material.

Further, be bonded with the B friction material with contacted two end faces of driving gear on the described frictional disk.

Further, described back shroud and described axle are made into split-type structural or integral structure.

Further, the utility model only needs No. one ultrasonic-frequency power supply output signal and control circuit, when the needs rotor rotates to a direction, the electrode slice that the signal of telecommunication of ultrasonic-frequency power supply output is linked into corresponding stator gets final product, if need rotor to rotate to another direction, by change over switch the electrode slice that the signal of telecommunication of this ultrasonic-frequency power supply output is linked into the another one stator is got final product.

Stator of the present utility model utilizes the elliptical vibration mode converter structure of particular design, realized the elliptical orbit motion of stator driving gear end face particle by the extensional vibration of piezoelectric ceramic piece, when two stators carry out work respectively, can drive rotor and carry out two-way continuous rotation motion.The utlity model has simple in structure, the advantage such as power capacity is large, and is easy to manufacture, and assembly difficulty is low; The utility model only needs one group of control circuit and driving power thereof in addition, and control-driven system is simple, and is easy to manufacture, and the control difficulty is little, and reliability is high; The utlity model has simultaneously volume little, lightweight, be easy to microminiaturization, integrated, cost is low, low-speed big, noise is little, response is fast, positioning accuracy is high, without the advantage such as electromagnetic interference and environmental suitability be strong, have a extensive future.

Description of drawings

Fig. 1 is structural representation of the present utility model.

Fig. 2 is elliptical vibration MODAL TRANSFORMATION OF A device three-dimensional structure schematic diagram of the present utility model.

Fig. 3 is application example schematic diagram of the present utility model.

Number in the figure explanation: 1. axle, 2. back shroud, 3. piezoelectric ceramic piece, 4. electrode slice, 5. elliptical vibration MODAL TRANSFORMATION OF A device, 6.A friction material, 7. B friction material, 8. frictional disk, 9. bearing, 10. spring, 11. ultrasonic-frequency power supplies

Embodiment

Shown in Fig. 1,2, a kind of single-electrical signal of the present utility model drives the bidirectional rotation ultrasound electric machine, comprise two identical stators, rotor and a cover malleation prefastening force adjustment mechanism, stator comprises axle and is set in successively back shroud, piezoelectric ceramic piece, electrode slice, elliptical vibration MODAL TRANSFORMATION OF A device on the axle, axle and elliptical vibration MODAL TRANSFORMATION OF A device are fixed back shroud, piezoelectric ceramic piece, electrode slice and elliptical vibration MODAL TRANSFORMATION OF A device after by thread connection, and described back shroud 2 and described axle 1 are split-type structural.

Described elliptical vibration MODAL TRANSFORMATION OF A device 5 is integrated, comprise the barrel portion of lower end and the driving gear part of upper end, described driving gear part is in the uniform upper end that is arranged on barrel portion of circumferencial direction, each driving gear is the list structure that both sides offer three rectangular indentation that are dislocatedly distributed, three rectangular indentation 7 width are 1.2mm, and the degree of depth is 0.8mm, and the center of three rectangular indentation 7 is respectively 4.5mm to the distance of driving gear upper surface, 7.5mm, 10.5mm.Described driving gear quantity is 6, and the driving gear end is bonded with the A friction material.

Rotor comprises frictional disk 8 and bearing 9, and bearing 9 is set on the axle 1 together by bonding frictional disk 8 inside that are arranged on, and is bonded with the B friction material with contacted two end faces of driving gear on the frictional disk 8;

The malleation prefastening force adjustment mechanism of ultrasound electric machine rotor and two stators comprises spring 10 and supporting construction, two coaxial settings of stator, driving increment all also contacts with frictional disk towards frictional disk, one of them stator is fixed by ring flange, another stator is connected end by ring flange and is connected with spring, supporting construction is connected in the spring other end, between two stators and rotor, form the malleation pretightning force, can change the decrement of spring 10 by the position of regulating supporting construction, thereby regulate the ultrasound electric machine stator to the precompression of rotor, precompression is set as 8N.

Single-electrical signal drives bidirectional rotation ultrasound electric machine external diameter 10mm, length 38mm, and used piezoelectric ceramic is PZT-8, is of a size of Ф 10 * Ф 5 * 2mmThe natural frequency of two stators is 98.6KHz, impedance is respectively 96 and 92 ohm, dynamic electric resistor is 22 and 20 ohm, ultrasonic-frequency power supply 11 output voltage ranges are 0-400V, current range is 0-4A, and output frequency is 98.6 ± 0.01KHz, and ultrasonic-frequency power supply 11 has the automatic frequency tracking function in designated frequency range.

In conjunction with shown in Figure 3, during operation, behind the signal of telecommunication of electrode slice 4 access ultrasonic-frequency power supplies 11 outputs of a stator of single-electrical signal driving bidirectional rotation ultrasound electric machine, because the inverse piezoelectric effect of piezoelectric ceramic piece 3, piezoelectric ceramic piece 3 will produce the longitudinal ultrasonic vibration, the electric energy that is about to ultrasonic-frequency power supply 11 outputs is converted to ultrasonic vibrational energy, and drive whole stator and carry out longitudinal ultrasonic vibration, when ultrasonic vibrational energy is delivered to elliptical vibration MODAL TRANSFORMATION OF A device 5 driving gear ends from stator after, be converted to extensional vibration and the compound vertical curved composite ultrasonic elliptical vibratory of flexural vibrations with certain phase difference, namely be converted to elliptical vibration MODAL TRANSFORMATION OF A device 5 driving gear ends along the tangential vertical curved composite ultrasonic elliptical vibratory of ultrasound electric machine circumference, driving gear end and frictional disk 8 contact, and then the driving rotor is rotated motion, operation is after 30 minutes continuously for ultrasound electric machine, and ultrasonic-frequency power supply 11 output voltages are 100V, and electric current is 0.23A, rotary speed of rotator is 465r/min, and running status is good.

When the needs rotor rotates to a direction, by change over switch the electrode slice that the signal of telecommunication of this ultrasonic-frequency power supply output is linked into the another one stator is got final product, after another stator moves 30 minutes continuously, ultrasonic-frequency power supply 11 output voltages are 100V, electric current is 0.25A, rotary speed of rotator is 473r/min, and running status is also good.

Claims (5)

1. a single-electrical signal drives the bidirectional rotation ultrasound electric machine, comprise two identical stators, rotor and a cover malleation prefastening force adjustment mechanism, it is characterized in that: stator comprises axle and is set in successively back shroud on the axle, piezoelectric ceramic piece, electrode slice, elliptical vibration MODAL TRANSFORMATION OF A device, axle and elliptical vibration MODAL TRANSFORMATION OF A device by after the thread connection with back shroud, piezoelectric ceramic piece, electrode slice and elliptical vibration MODAL TRANSFORMATION OF A device are fixed, described elliptical vibration MODAL TRANSFORMATION OF A device is integrated, comprise the barrel portion of lower end and the driving gear part of upper end, described driving gear part is in the uniform upper end that is arranged on barrel portion of circumferencial direction, and each driving gear is the list structure that both sides offer three rectangular indentation that are dislocatedly distributed; Rotor comprises frictional disk and bearing; The malleation prefastening force adjustment mechanism comprises spring and supporting construction; Described two coaxial settings of stator, and stator drives increment and all also contacts with frictional disk towards frictional disk, one of them stator is fixedly installed by ring flange, and another stator forms the malleation pretightning force by ring flange and spring and supporting construction connection between two stators and rotor.

2. a kind of single-electrical signal according to claim 1 drives the bidirectional rotation ultrasound electric machine, it is characterized in that: the driving gear quantity of described each stator is 3-12.

3. a kind of single-electrical signal according to claim 1 drives the bidirectional rotation ultrasound electric machine, and it is characterized in that: described back shroud and described axle are made into split-type structural or integral structure.

According to claim 1 and 2 or 3 described a kind of single-electrical signals drive the bidirectional rotation ultrasound electric machines, it is characterized in that: described elliptical vibration MODAL TRANSFORMATION OF A device driving gear end is bonded with the A friction material.

According to claim 1 and 2 or 3 described a kind of single-electrical signals drive the bidirectional rotation ultrasound electric machines, it is characterized in that: be bonded with the B friction material with contacted two end faces of driving gear on the described frictional disk.

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