CN203225677U - Single-excitation rotary ultrasonic motor - Google Patents

Abstract

The utility model discloses a single-excitation rotary ultrasonic motor. A rotor comprises a rotating disc and a frictional layer arranged on the surface of the rotating disc, a stator comprises an ultrasonic vibration transducer, an oval vibration mode converter and a frictional driving block arranged at the front end of the oval vibration mode converter; the ultrasonic vibration transducer comprises a bolt, and a rear cover plate, a piezoelectric ceramic piece, an electrode slice and a front cover plate which are sleeved on the bolt in sequence, and the front cover plate and the bolt are connected through threads; the oval vibration mode converter is arranged at the front end of the front cover plate, the overall oval vibration mode converter is cylinder-shaped, upper and lower sides are provided with three rectangular gaps which are in staggered distribution, the converter can convert longitudinal ultrasonic vibration generated by the ultrasonic vibration transducer into oval vibration of the tail end of the oval vibration mode converter and the frictional driving block, and the rotor is driven to perform continuous rotary motion.

Description

A kind of single stimulated rotation 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 stimulated rotation 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, be to utilize the inverse piezoelectric effect of piezoelectric to realize the mechanical-electric coupling device 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.Because of advantages such as it has that volume is little, in light weight, low-speed big, noise are little, response is fast, positioning accuracy is high, no electromagnetic interference and environmental suitability are strong, obtained increasingly extensive application in technical fields such as medical treatment, Aero-Space, robot, MEMS.

Problems such as in the existing rotary-type ultrasound electric machine, mainly adopt the outer flexural vibration mode of face to be combined into the capable ripple of end face, and drive the rotor rotation at present, the ubiquity driving moment is little, and axial volume is big, the interior external diameter contact zone wearing and tearing difference of rotor is big; In addition, even adopted in plane vibration mode, in order to apply the radial tightening power in the face, the disk of oscillator or rotor or annulus are made two semi-discs or semicircular ring, middle be connected into disk or annulus to apply the radial tightening power in the face by spring, also be difficult at present realize big torque, and functional reliability is low.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.Though this motor has advantages such as output torque is bigger, but six piezoelectric ceramic pieces of motor will stagger mutually by the polarization subregion and 60 install, 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 makes stator and rotor contact position precision between the two be affected, and then influences the stability of motor torque and speed; Thereby there is complex structure in this type of rotary ultrasonic motor, to the contact position required precision height between stator and the rotor, makes difficulty, the defectives such as poor stability of motor torque and speed are installed.

Summary of the invention

The utility model provides a kind of novel single stimulated rotation ultrasonic motor, and purpose is the deficiency that exists in the above-mentioned rotary ultrasonic motor in order to overcome.

A kind of single stimulated rotation ultrasonic motor comprises stator and rotor, and rotor comprises rotating disk and is arranged on the frictional layer of disc surfaces; Stator comprises ultrasonic vibration transducer, elliptical vibration MODAL TRANSFORMATION OF A device and friction-driven piece; The ultrasonic vibration transducer comprises that bolt reaches back shroud, piezoelectric ceramic piece, electrode slice and the front shroud that is set in successively on the bolt, front shroud and bolt are fixed back shroud, piezoelectric ceramic piece, electrode slice and front shroud by thread connection, constituted the power conversion part of single stimulated rotation ultrasonic motor, the ultrasonic electric energy of ultrasonic-frequency power supply output has been converted to the ultrasonic vibrational energy of ultrasonic transducer.

Described elliptical vibration MODAL TRANSFORMATION OF A device and front shroud are made into the front end that an integral body is arranged on front shroud, perhaps utilize an additional connection double-screw bolt elliptical vibration MODAL TRANSFORMATION OF A device to be connected in the front end of front shroud, elliptical vibration MODAL TRANSFORMATION OF A device integral body is cylindrical, it offers three rectangular indentation that are dislocatedly distributed in both sides up and down, the purpose that rectangular indentation is set is in order to change the mode of oscillation of ultrasonic vibration transducer, make its extensional vibration model frequency and flexural vibration mode frequency approaching or equal, the longitudinal ultrasonic that the ultrasonic vibration transducer is produced vibrates the vertical composite ultrasonic elliptical vibratory of bending that is converted to elliptical vibration MODAL TRANSFORMATION OF A device end.Described friction-driven piece is arranged on the front end of elliptical vibration MODAL TRANSFORMATION OF A device by welding or bonding way, and the friction-driven piece contacts with frictional layer on the rotating disk.The ring flange of ultrasonic vibration transducer is used for installing stator and precompression device, and stator is connected the single stimulated rotation ultrasonic motor of formation in aggregates with rotor, and the ultrasonic vibration transducer axis after ring flange is fixing and the angle of plane of rotor disc are 20 degree ~ 160 degree.

After the ultrasonic signal of telecommunication of ultrasonic-frequency power supply output is linked into the electrode slice of ultrasonic vibration transducer, the ultrasonic vibration transducer namely produces ultrasonic vibration, after ultrasonic vibrational energy is delivered to elliptical vibration MODAL TRANSFORMATION OF A device end from the ultrasonic vibration transducer, 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 the vertical curved composite ultrasonic elliptical vibratory of elliptical vibration MODAL TRANSFORMATION OF A device end; And drive the friction-driven piece and elliptical vibration MODAL TRANSFORMATION OF A device end is done ultrasonic elliptical vibratory together, and then drive rotor and rotatablely move continuously.Compare single stimulated rotation ultrasonic motor that existing document is introduced, this rotary ultrasonic motor has that power capacity is big, energy conversion efficiency is high, simple in structure, easy to manufacture, advantage such as cost is low, the rigidity of structure is big, control-driven system is simple and vibration performance is stable.

Further, described single stimulated rotation ultrasonic motor has only one group of extensional vibration piezoelectric ceramic piece.

Further, described single stimulated rotation ultrasonic motor only needs one road ultrasonic signal of telecommunication excitation.

The utility model has adopted mechanical oscillation MODAL TRANSFORMATION OF A mechanism the extensional vibration of ultrasonic transducer to be converted to the vertical curved composite ultrasonic elliptical vibratory of elliptical vibration MODAL TRANSFORMATION OF A device, simplified the overall structure of single stimulated rotation ultrasonic motor, greatly reduce the complexity of vibrational system, manufacturing, assembly difficulty and production cost have been reduced, whole single stimulated rotation ultrasonic motor is simple in structure, easy to manufacture, is conducive to the realization of microminiaturized target; This utility model only needs No. one control circuit and the ultrasonic signal of telecommunication to encourage in addition, the control difficulty is low, avoided two-phase or multiphase ultrasonic vibration to be compounded to form the complicated ultrasonic-frequency power supply development cost of elliptical vibration transducer, control circuit and ultrasonic-frequency power supply structure have been simplified, control circuit and ultrasonic-frequency power supply cost have been reduced, control circuit and ultrasonic-frequency power supply volume have been reduced, be easy to realize the microminiaturization of control circuit and ultrasonic-frequency power supply, integrated, improved reliability, service behaviour is more stable, has a extensive future.

Description of drawings

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

Fig. 2 is application example schematic diagram of the present utility model.

Number in the figure explanation: 1. bolt, 2. back shroud, 3. piezoelectric ceramic piece, 4. electrode slice, 5. front shroud, 6. elliptical vibration MODAL TRANSFORMATION OF A device, 7. rectangular indentation, 8. rotating disk, 9. frictional layer, 10 friction-driven pieces, 11. ultrasonic-frequency power supplies

Embodiment

In conjunction with shown in Figure 1, a kind of single stimulated rotation ultrasonic motor comprises stator and rotor, and rotor comprises rotating disk 8 and is bonded in the frictional layer 9 on rotating disk 8 surfaces; Stator comprises ultrasonic vibration transducer, elliptical vibration MODAL TRANSFORMATION OF A device 6 and friction-driven piece 10; The ultrasonic vibration transducer comprises that bolt 1 reaches back shroud 2, piezoelectric ceramic piece 3, electrode slice 4 and the front shroud 5 that is set in successively on the bolt 1, and front shroud 5 and bolt 1 are fixed back shroud 2, piezoelectric ceramic piece 3, electrode slice 4 and front shroud 5 by thread connection.This list stimulated rotation ultrasonic motor has only one group of extensional vibration piezoelectric ceramic piece 3, piezoelectric ceramic transducer section diameter 30mm, and the material of piezoelectric ceramic piece 3 is PZT-8, is of a size of: Ф 30mm * Ф 15mm * 5mm, the sheet number is 2.

Described elliptical vibration MODAL TRANSFORMATION OF A device 6 and front shroud 5 are made into the front end that an integral body is arranged on front shroud 5, elliptical vibration MODAL TRANSFORMATION OF A device 6 integral body are cylindrical, diameter 15mm, both sides offer three rectangular indentation that are dislocatedly distributed 7 up and down, three rectangular indentation 7 width are 6mm, and the degree of depth is 3mm, and the distance of the centre-to-centre spacing front end face of three rectangular indentation 7 is respectively 15mm, 25mm, 35mm.Described friction-driven piece 10 is by the bonding front end that is arranged on elliptical vibration MODAL TRANSFORMATION OF A device 6, and friction-driven piece 10 contacts with frictional layer 9 on the rotating disk 8.Utilize the ring flange of ultrasonic vibration transducer that stator and precompression device are installed, stator is connected the single stimulated rotation ultrasonic motor of formation in aggregates with rotor, the ultrasonic vibration transducer axis after ring flange is fixing and the angle on rotating disk 8 planes are 45 degree.

This list stimulated rotation ultrasonic motor stator natural frequency is 25.32KHz, impedance is 86 ohm, dynamic electric resistor is 17 ohm, only need one road ultrasonic signal of telecommunication excitation, ultrasonic-frequency power supply 11 output voltage ranges are 0-400V, current range is 0-4A, and output frequency is 25.32 ± 0.01KHz, and ultrasonic-frequency power supply 11 has the automatic frequency tracking function in designated frequency range.

In conjunction with shown in Figure 2, after the ultrasonic signal of telecommunication of ultrasonic-frequency power supply output is linked into the electrode slice 4 of ultrasonic vibration transducer, the ultrasonic vibration transducer namely produces ultrasonic vibration, after ultrasonic vibrational energy is delivered to elliptical vibration MODAL TRANSFORMATION OF A device 6 ends from the ultrasonic vibration transducer, 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 the vertical curved composite ultrasonic elliptical vibratory of elliptical vibration MODAL TRANSFORMATION OF A device 6 ends; And drive friction-driven piece 10 and elliptical vibration MODAL TRANSFORMATION OF A device 6 ends are done ultrasonic elliptical vibratory together.Move that system reaches the stable vibration state after 10 minutes, the output voltage of ultrasonic-frequency power supply 11 is 240V, and electric current is 1.45A, when the friction-driven piece with after rotor contacts, drive rotor and rotatablely move continuously, diameter is that the edge peripheral linear speed peak value of the rotating disk 8 of 40mm is 56.2mm/s.

Claims (5)

1. a single stimulated rotation ultrasonic motor comprises rotor and stator, and rotor comprises rotating disk and is arranged on the frictional layer of disc surfaces; It is characterized in that: described stator comprises ultrasonic vibration transducer, elliptical vibration MODAL TRANSFORMATION OF A device and friction-driven piece; The ultrasonic vibration transducer comprises that bolt reaches back shroud, piezoelectric ceramic piece, electrode slice and the front shroud that is set in successively on the bolt, and front shroud and bolt are fixed back shroud, piezoelectric ceramic piece, electrode slice and front shroud by thread connection; Described elliptical vibration MODAL TRANSFORMATION OF A device is arranged on the front end of front shroud, its integral body is cylindrical, both sides offer three rectangular indentation that are dislocatedly distributed up and down, described friction-driven piece is arranged on the front end of elliptical vibration MODAL TRANSFORMATION OF A device, and the ultrasonic vibration transducer axis after ring flange is fixing and the angle of plane of rotor disc are 20 degree ~ 160 degree.

2. a kind of single stimulated rotation ultrasonic motor according to claim 1, it is characterized in that: described elliptical vibration MODAL TRANSFORMATION OF A device and front shroud are made into the front end that an integral body is arranged on front shroud.

3. a kind of single stimulated rotation ultrasonic motor according to claim 1 is characterized in that: comprise that also one connects double-screw bolt, is used for elliptical vibration MODAL TRANSFORMATION OF A device is connected in the front end of front shroud.

4. a kind of single stimulated rotation ultrasonic motor according to claim 1, it is characterized in that: described friction-driven piece is arranged on the front end of elliptical vibration MODAL TRANSFORMATION OF A device by welding.

5. a kind of single stimulated rotation ultrasonic motor according to claim 1, it is characterized in that: described friction-driven piece is by the bonding front end that is arranged on elliptical vibration MODAL TRANSFORMATION OF A device.

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