Piezomotors presentation for Halliburton, V. Lavrinenko, A. Tyshko 2008

Piezomotors
Dr. V. Lavrinenko – Kiev Technical University, Ukraine
A. Tyshko – Halliburton, USA
Exton April 2, 2008
Piezomotors, presentation April 2, 2008
V. Lavrinenko, Ph. D. E. E, A.Tyshko, Principal E. E.

V. Lavrinenko, A. Tyshko
Ukrainian patents

Scope
1. Introduction to the principles of operation
2. Possible application for oil well logging business
3. Limiting factors
V. Lavrinenko, Ph. D, A.TyshkoV. Lavrinenko, Ph. D. E. E, A.Tyshko, Principal E. E.

Electrical to mechanical energy conversion
Electromagnetic motor – traditional motors using magnetic field created
by electrical current flowing through the windings, exciting magnetic
field and producing mechanical force, converting into torque.
Piezomotor – other kind of motors using electrical field – voltage –
applied to the piezoactuators, converting mechanical vibration of the
actuator into force through the mechanical contact.

Principles of operation
Input power – AC voltage - is applied to the piezoceramic actuator of the
piezomotor at the resonant frequency thus exciting mechanical
vibrations of the actuator located mostly in the stator of motor.
Piezoelectric ultrasonic motors are driven by tangential stresses in the
interface between stator and rotor (direct contact) or pusher and rotor
(indirect contact).
These stresses are generated by elliptical motion of the material points
of the stator or rotor surfaces and depend on frictional processes in the
contact area.
The contact mechanics of the piezoelectric ultrasonic motors determines
the operational characteristics like rotational or linear speed and torque
or force or transmitted mechanical power and efficiency.
Lifetime and wear properties of piezoelectric motors are also determined
by contact mechanics and depend upon temperature

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Direct contact between Piezoelement PE and rotor
AC generator
Piezoelement
Rotor
Point of
contact
V. Lavrinenko, Ph. D, A.TyshkoV. Lavrinenko, Ph. D, A.TyshkoV. Lavrinenko, Ph. D. E. E, A.Tyshko, Principal E. E.

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Friction contact between Piezoelement PE and rotor via pusher
Pusher
V. Lavrinenko, Ph. D, A.TyshkoV. Lavrinenko, Ph. D, A.TyshkoV. Lavrinenko, Ph. D. E. E, A.Tyshko, Principal E. E.

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Reversible piezomotor
Counterclockwise
rotating motor
Clockwise
rotating motor

Application of the piezomotors are based on the following properties
1. simplicity;
2. small size and small step – widely used for cameras, optical systems scanning and
micromanipulators, minimal step may be in order of the fractions of angle second so
piezomotor is considered the ideal positioning device;
3. high torque – up to 50N*m (~35lb*ft) for currently produced motors – used for ball
valves for gas, oil and other liquids – currently produced in Ukraine, 500,000 cycles;
4. low rpm without the gearbox and wide speed range (from <1 to >5,000 rpm) make
possible direct drive;
5. nonmagnetic application – used for NMR systems in medical equipment;
6. low noise operation both mechanical and magnetic;
7. ability to work up to 250C and higher depending on the piezoceramic;
8. piezomotor combines motor and a break eliminating a need in separately controlled
breaks;
9. piezomotor output power does not depend upon the mass of the rotor thus providing
low delay time, which is important for close loop systems;
10. piezomotor is able to reconnect electrical circuitries in milliseconds making possible
to switch current while voltage is crossing zero;
12. reliability and lifetime depend upon a friction pair and currently is in the range of 500
to over 5,000 hours for room temperature, sample tested for 50h at 200C.
13. mechanical overload does not destroy piezomotor

“Hedgehog” pusher design, current production
by Piezoelectronic Lab

100W piezomotor, 10n*m torque @ 100rpm, OD 120mm

50n*m torque @ 20rpm, OD 120mm

Reversal piezomotor with position sensor for computer control

Ball valve with reversal piezomotor actuator, more than
10,000 produced by Piezoelectronic Lab

Different ball valves by Piezoelectronic Lab

Proposed actuator for electromechanical high current switch

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Linear piezomotor,
Manufactured by PI – Germany, first samples produced by Piezoelectronic Lab
Piezomotors, presentation April 2, 2008Piezomotors, presentation April 2, 2008

Torque vs. rpm for wave ultrasonic motor OD 40mm
Information from PI - Germany

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PZT ceramic parameters drift vs. time and temperature,
Information from PI - Germany

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Summary
1. Piezomotors may solve some problems with high current /
high voltage electromechanical switches operating downhole
especially in the strong magnetic fields – in NMR antennas.
2. Low rpm / high torque actuators may be used for calipers
3. Remote controlled ball valves operating without gearboxes
are tested, manufactured and used in Ukraine, they may
reliably regulate oil, gas, water or mud flows.
4. With over 40 years of experience with piezoceramic materials
Dr. Lavrinenko and his Laboratory of Piezoelectronics of
National Technical University “KPI” in Kiev, Ukraine may be
useful for energy service companies in wide range of
applications including piezomotors and other actuators and
piezotransformer based power supplies.

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Contacts
Viacheslav Lavrinenko, Ph. D. in E.E.
Laboratory of Piezoelectronics, KPI, Kiev, Ukraine
038-044-454-9208 wk, email hor@ee.ntu-kpi.kiev.ua
Alex Tyshko, Principal Technical Professional (EE)
Halliburton
Exton, PA, USA
1-484-329-2979 wk, email alex.tyshko@halliburton.com
Email addresses
updated 2013
v_lavr@voliacable.com
atyshko01@comcast.net

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References
Survey of the Various Operating Principles of Ultrasonic Piezomotors
http://www.pi-usa.us/technotes/Actuator2006_SurveyoftheVariousOperatingPrinciplesofUltrasonic
Piezoceramic Materials
http://www.piceramic.de/pdf/piezo_material.pdf
Laboratory of Piezoelectronics, Kiev Technical University
http://www.ntu-kpi.kiev.ua/lab/pp/index.htm
A list of over 150 patents (the first operational piezomotor by V. Lavrinenko –
patent USSR #217509 priority May 10, 1965) and articles is available upon request

Piezomotors presentation for Halliburton, V. Lavrinenko, A. Tyshko 2008

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Piezomotors presentation for Halliburton, V. Lavrinenko, A. Tyshko 2008