CN203261258U - Single electric signal drive-for-rotation ultrasonic motor - Google Patents

Abstract

The utility model discloses a single electric signal drive-for-rotation ultrasonic motor comprising a mandrel, and a rear cover plate, piezoelectric ceramics sheets, electrode sheets, an oval vibration modal converter, a friction disc, a bearing, a spring and a screw nut sleeved in sequence on the mandrel; the mandrel, the rear cover plate, the piezoelectric ceramics sheets, the electrode sheets, and the oval vibration modal converter form a stator portion of the ultrasonic motor; the friction disc and the bearing form a rotor portion of the ultrasonic motor; and the spring and the screw nut form a positive pressure pretightening force adjusting mechanism of the rotor portion and the stator portion of the ultrasonic motor. The oval vibration modal converter is specially designed; and vertical vibration mode of a set of piezoelectric ceramics is employed to realize oval locus motions of stator driving teeth end face mass points, thereby driving the rotor for rotation. The single electric signal drive-for-rotation ultrasonic motor is simple in structure, easy in making, easy to be minimized and integrated, low in cost, small in control difficulty, and is wide in application prospect.

Description

A kind of single-electrical signal drives rotary ultrasonic motor

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 rotary ultrasonic motor.

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 sandwich oscillator generation extensional vibration 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, has 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 deficiencies in the prior art, the purpose of this utility model is to provide a kind of novel single-electrical signal to drive rotary ultrasonic motor.

A kind of single-electrical signal drives rotary ultrasonic motor, it is characterized in that: comprise axle and be set in successively back shroud, piezoelectric ceramic piece, electrode slice, elliptical vibration MODAL TRANSFORMATION OF A device, frictional disk, bearing, spring and nut on the axle; Described axle, back shroud, piezoelectric ceramic piece, electrode slice, elliptical vibration MODAL TRANSFORMATION OF A device consist of the stationary part of described ultrasound electric machine, 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.

Described frictional disk and bearing consist of the rotor portion of ultrasound electric machine; Described spring and nut consist of the malleation prefastening force adjustment mechanism of ultrasound electric machine rotor portion and stationary part.

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 the contacted end face of driving gear on the described frictional disk.

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

The utility model stator adopts the sandwich transducer structure, elliptical vibration mode converter by particular design, utilize the longitudinal vibration mode of one group of piezoelectric ceramic to realize that the elliptical orbit of stator driving gear end face particle moves, drive rotor, have simple in structure, the advantages 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 parts three-dimensional exploded schematic diagram of the present utility model.

Fig. 3 is elliptical vibration MODAL TRANSFORMATION OF A device three-dimensional structure schematic diagram of the present utility model.

Fig. 4 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. nuts, 12. ultrasonic-frequency power supplies

Embodiment

Shown in Fig. 1,2,3, a kind of single-electrical signal of the present utility model drives rotary ultrasonic motor, comprises axle 1 and is set in successively back shroud 2, piezoelectric ceramic piece 3, electrode slice 4, elliptical vibration MODAL TRANSFORMATION OF A device 5, frictional disk 8, bearing 9, spring 10 and nut 11 on the axle 1; Described axle 1, back shroud 2, piezoelectric ceramic piece 3, electrode slice 4, elliptical vibration MODAL TRANSFORMATION OF A device 5 consist of the stationary part of described ultrasound electric machine, internal thread by the external screw thread on the axle 1 and elliptical vibration MODAL TRANSFORMATION OF A device 5 connects, back shroud 2, piezoelectric ceramic piece 3, electrode slice 4 and elliptical vibration MODAL TRANSFORMATION OF A device 5 are fixed, and described back shroud 2 and described axle 1 are made into 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 5mm to the distance of driving gear upper surface, 8mm, 11mm.Described driving gear quantity is 6, and the driving gear end is bonded with the A friction material.

Described frictional disk 8 and bearing 9 consist of the rotor portion of ultrasound electric machine, are set on the axle 1 after frictional disk 8 and bearing 9 connect by interference fit, are bonded with the B friction material with the contacted end face of driving gear on the frictional disk 8; Described spring 10 and nut 11 consist of the malleation prefastening force adjustment mechanism of ultrasound electric machine rotor portion and stationary part, can change the decrement of spring 10 by the position of adjusting nut 11 on axle 1, thereby the precompression of regulating electric machine pair-rotor motor stator, precompression is set as 6N.

Single-electrical signal drives rotary ultrasonic motor external diameter 10mm, length 38mm, and used piezoelectric ceramic is PZT-8, is of a size of Ф 10 * Ф 5 * 2mm, natural frequency is 98.6KHz, impedance is 96 ohm, dynamic electric resistor is 22 ohm, and ultrasonic-frequency power supply 12 output voltage ranges are 0-400V, and current range is 0-4A, output frequency is 98.6 ± 0.01KHz, and ultrasonic-frequency power supply 12 has the automatic frequency tracking function in designated frequency range.

In conjunction with shown in Figure 4, during operation, behind the signal of telecommunication of electrode slice 4 access ultrasonic-frequency power supplies 12 outputs of single-electrical signal driving rotary ultrasonic motor, 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 12 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 12 output voltages are 100V, and electric current is 0.23A, rotary speed of rotator is 465r/min, and running status is good.

Claims (5)

1. a single-electrical signal drives rotary ultrasonic motor, it is characterized in that: comprise axle and be set in successively back shroud, piezoelectric ceramic piece, electrode slice, elliptical vibration MODAL TRANSFORMATION OF A device, frictional disk, bearing, spring and nut on the axle; Described axle, back shroud, piezoelectric ceramic piece, electrode slice, elliptical vibration MODAL TRANSFORMATION OF A device consist of the stationary part of described ultrasound electric machine, 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; Described frictional disk and bearing consist of the rotor portion of ultrasound electric machine; Described spring and nut consist of the malleation prefastening force adjustment mechanism of ultrasound electric machine rotor portion and 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, and each driving gear is the list structure that both sides offer three rectangular indentation that are dislocatedly distributed.

2. a kind of single-electrical signal according to claim 1 drives rotary ultrasonic motor, it is characterized in that: described driving gear quantity is 3-12.

3. a kind of single-electrical signal according to claim 1 drives rotary ultrasonic motor, 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 rotary ultrasonic motors, 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 rotary ultrasonic motors, it is characterized in that: be bonded with the B friction material with the contacted end face of driving gear on the described frictional disk.

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