DTI PM-20R User manual

Rev. 12/12/2017
INSTRUCTION MANUAL
Rotary Bidirectional
Piezoelectric Motor
Evaluation Kit
(Model: PM-20R)
Made in USA
www.dtimotors.com

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Table of Contents
1.0 Introduction ..............................................................................................................................3
2.0 Properties .................................................................................................................................4
3.0 Unpacking and Preparation........................................................................................................5
4.0 Technical Specifications .............................................................................................................5
4.1 Schematic Drawings...............................................................................................................6
5.0 Operation and Control of the Piezomotor...................................................................................7
5.1 Connecting the Power Supply ................................................................................................7
5.2 Connecting the Driver Board ..................................................................................................7
5.3 Operation of the Motor and Driver Board...............................................................................7
5.4 External Control.....................................................................................................................7
5.5 Stepping and Continuous Modes............................................................................................7
6.0 Technical Support ......................................................................................................................8
7.0 Warranty...................................................................................................................................8

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PM-20R OEM Evaluation Kit Instruction Manual
1.0 Introduction
The contents of this kit are intended to be used as an evaluation tool for engineers interested in
learning more about the performance and operation of DTI’s PM-20R piezoelectric motors
(piezomotors). The PM-20R is a technically advanced piezomotor designed for precise positioning
applications. The PM-20R combines high performance and excellent quality with an affordable low
cost.
The electronic driver PCB for the piezomotor is included in the kit, together with cables and a 12 DC
power supply.
Figure 1. Electronic PCB driver

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Figure 2. Model PM-20R
2.0 Properties
Some of the unique properties of the PM-20R include:
▪Modern reinforced engineered thermoplastic design provides reliability and low cost
▪Superior precision and resolution
▪Ultra-Fast response time with superior start-stop characteristics
▪High torque for size
▪Designed for direct drive applications
▪Stepping and Continuous mode of operation
▪Six orders of magnitude speed dynamic range
▪When not energized, the motor serves as a brake and consumes zero power
▪Silent operation in continuous mode
▪Low voltage and decreased possibility for electrical arcing

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3.0 Unpacking and Preparation
After unpacking the PM-20R evaluation kit, the items should be checked against the Parts List
shown in Table 1. If any items are missing contact DTI immediately for replacement parts.
DESCRIPTION
Part No.
Piezomotor Model PM-20R
B25-4200-EK
Electronic Driver PCB
Included
Interconnect cables
Included
Power Supply (12V DC)
Included
Table 1 – Parts List
4.0 Technical Specifications
The following technical specification are provided with the PM-20R.
Motor model
PM-20R
Mode of operation
Continuous/Stepping
Uni/Bi-directional
Bi
Max angular speed (RPM)
≥60
Max operating torque (N.m)
≥0.1
Holding torque (N.m)
≥0.11
Angular resolution (arcsec)
≤1
Dynamic range (kHz)
4
Supply voltage (V)
12
Motor weight (g)
100
Operating Temperature (°C) (°C)
-20°C to + 80°C
Dimensions, length x width x height (mm)
38x45
Table 2 – PM-20R Specifications

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4.1 Schematic Drawings
Figure 3 – Schematic drawing (mm) of Model # PM-20R

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5.0 Operation and Control of the Piezomotor
5.1 Connecting the Power Supply
Connect the 12V Power Supply to the Power Supply Connector located on the electronic driver
PCB (Figure 1). Connect the other end of the 12V Power Supply to an appropriate wall power
socket.
5.2 Connecting the Driver Board
The piezomotor connects to the driver board by a connector on the end of the motor wire. This
connector mates with the corresponding connector on the electronic driver PCB. The connectors
can only be joined in one possible orientation. Press the connector gently in place so that it is
flush with the edges of the receptacle on the driver PCB.
5.3 Operation of the Motor and Driver Board
The electronic driver PCB generates the drive signals required by the piezomotor. Motion is created
causing the rotor to rotate. The design enables travel in both directions. Manual control of rotation
is achieved by pushing alternatively the two buttons on the driver board.
5.4 External Control
The driver board can be controlled using an external signal source. Control signals are applied to
Pin 1 or Pin 2 on the External Signal Connector (1,2,3) Fig. 1; depending on the desired direction of
travel. Pin 3 is the common wire. The unused wire must be held at TTL high or be left open. The
control signals applied to Pins 1 or 2 must be TTL compatible. A “high” level (1.8 to 12 Volts) disables
travel, a ‘low’ level (0 to 0.8 Volts) enables travel.
5.5 Stepping and Continuous Modes
The mode of travel, stepping or continuous, depends on the type of signal applied to the External
Signal Connector (1,2,3) Fig. 1. A constant “low” level (D.C.) signal will result in continuous motion
at maximum speed. A pulse or pulse train will result in stepping operation.
In the stepping mode (PWM mode), the size of each step is determined by the pulse duration, and
the speed of travel is determined by the pulse repetition rate. The minimum pulse duration is around
30 microseconds. The maximum repetition rate F, measured in Hertz, for a selected pulse duration
T, measured in seconds, is determined by the formula F = 1/T.

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Warning Note: Using PM-20R in Continuous Mode
The PM-20R piezomotor is capable of high force and fast reaction, but it is designed for short
duration start /stop applications. Although the motor could be run continuously in continuous
mode, prolonged operation in continuous mode can lead to overheating in the motor (unless
cooled) and possible internal damage. This restriction does not apply when using the PM-20R in
Stepping Mode. For applications requiring prolonged operation of continuous mode, please contact
DTI’s Technical Support.
6.0 Technical Support
Technical support is available from 9 AM to 5.30 PM U.S. Eastern Time. Please refer to contact
information at end of manual.
7.0 Warranty
DTI products are produced to state of the art production methods and are subject to strict quality
control. All sales and deliveries are made exclusively on the basis of our general Terms and Conditions
of Business. These are available to view and download on the DTI homepage at
http://www.dtimotors.com/terms-and-conditions/
Discovery Technology International, Inc.
6968 Professional Parkway East
Sarasota, Florida 34240
USA
Tel: [phone]
Email: [e-mail]
www.dtimotors.com