PIEZOMOTION LAS Series User manual

Table of Contents
1.0 Introduction...........................................................................................................................................................................2
2.0 Properties .............................................................................................................................................................................. 4
3.0 Unpacking and Preparation..................................................................................................................................... 4
4.0 Technical Specications ..............................................................................................................................................5
4.1 Specication for LAS Series linear motors tted with Piezo Motion encoder...................5
4.2 Mechanical Drawings of LAS Series linear motors ............................................................................. 6
5.0 Operation and Control of the Piezo motor..................................................................................................... 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 Open loop mode control ...................................................................................................................................... 7
5.5 Stepping and Continuous Modes................................................................................................................... 8
5.6 Factory Installed Open-Loop Demonstration Mode ......................................................................... 9
5.7 Recommended settings to avoid overheating.................................................................................... 10
5.8 Closing the loop for LAS with Piezo Motion installed encoder ................................................. 11
6.0 Technical Support...........................................................................................................................................................12
7.0 Warranty................................................................................................................................................................................12
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LAS Encoder Series OEM Evaluation Kit Instruction Manual
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1.0 Introduction
This manual covers instructions for the use and operation of the LAS Series of linear piezomotors. The
LAS Series represents a quantum leap in design of small size high-performance linear motors.
Injection-molded using extremely durable, but lightweight engineered reinforced thermoplastics, the
LAS Series motors provides superior precision and functionality with ultra-fast response/start-stop
characteristics. Highly energy efcient, the LAS Series motors consume zero power in hold position while
still providing necessary force. Available in a variety of congurations (including with factory tted encoder)
they are the ideal choice for high volume demanding OEM applications where superior performance and
economical unit cost are important factors.
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 Piezo Motion’s LAS Series piezomotors.
The electronic driver PCB for the LAS piezomotor is included in the evaluation kit, together with cables and
a 5 VDC power supply.
Figure 1. Electronic PCB Driver for LAS piezomotor
Rev. A ECO# 210128
MicroUSB to +5V
Motor Connector
Button “Right”
Button “Left”
MCLR
+3.3V
GND
GND
PGD
Right
PGC
Left
}
J2{
J3

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Figure 2. LAS Series motor (front and back) non-encoder version
Figure 3. LAS Series motor (front and back) tted with factory installed encoder
NOTE – Moving carriage on all motor models has mounting holes for M2 size self-tapping screw (e.g. see https://us.screwerk.com
Rev. A ECO# 210128

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3.0 Unpacking and Preparation
After unpacking the LAS series motor evaluation kit, check the contents against the items listed in the table
below. If any items are missing contact Piezo Motion immediately for replacement parts.
2.0 Properties
Some of the unique properties of the LAS Series motors 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 force 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
Table 1 – Description
Rev. A ECO# 210128

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4.0 Technical Specifications
4.1 Specification for LAS Series linear motors with and without factory-installed encoder
Table 2 – LAS Series Specications
Table 3 – LAS Series with factory-installed encoder Specications
Rev. A ECO# 210128

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Figure 4. Drawings of LAS Series linear motors non-encoder version
Figure 5. Mechanical Drawings of LAS Series linear motors with factory-installed integrated encoder
4.2 Mechanical Drawings of LAS Series linear motors
Rev. A ECO# 210128

5.0 Operation and Control of the Piezo motor
5.1 Connecting the Power Supply
Connect the 5 VDC Power Supply to the Micro USB connector on power supply connector located on the
electronic driver PCB (Figure 1). Connect the other end of the Power Supply to an appropriate wall power
socket (110-240 V AC).
5.2 Connecting the Driver Board
The piezo motor connects to the driver board by a connector on the end of the motor wire. This
connector mates with the corresponding connector (J2) 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 ush 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 piezo motor. Motion is created
causing the rotor to rotate. The design enables travel in both directions. Manual control of motion is
achieved by pushing alternatively the two buttons on the driver board.
5.4 Open loop mode control
The motor can be controlled by applying a PWM (Pulse Width Modulation) control signals to either “J3
Right” or “J3 Left” on the driver board, depending on the desired direction of travel. J3 GND is the common
wire. A TTL “high” level voltage (2.0 to 5 Volts) enables travel, a TTL “low” level voltage (0 to 0.8 Volts) disables
travel. The unused wire must be held at TTL “low” or be left open.
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5.5 Stepping and Continuous Modes
The mode of travel, stepping or continuous, depends on the type of signal applied to the PCB inputs at J3.
A constant “high” 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 10-15 µs.
The maximum repetition rate F, measured in Hertz, is determined by the Dynamic range of the piezo motor
and it is 4 kHz for all Piezo Motion motors.
Example PWM Control Setting for Minimum Step (approx. 0.04 µm)
• Set Pulse Duration to between 20 µs - 40 µs
• Set Frequency to between 3 kHz - 4 kHz
Example setting for stepping (PWM) mode operation with 50% duty cycle
• Set repetition rate/frequency = 100 Hz (period of 10 ms)
• Set pulse duration = 5 ms.
• Duty cycle = 50%.
Note: Although the maximum operating repetition rate of the motor is 4 kHz, for operating repetition rates
above 2 kHz, phase synchronization of the input signals on both channels is required for optimal
performance of the motor.
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Rev. A ECO# 210128

5.6 Factory Installed Open-Loop Demonstration Mode
The LAS driver PCB is factory programmed with a useful demonstration program that is designed to familiarize the user
with the versatility, performance, and capabilities of the LAS motor.
The demonstration mode is initiated by simultaneously pressing and holding down both of the Manual Control Buttons
on the driver PCB for a few seconds. This will cause the LAS motor to run through a series of motion control exercises
during which it will demonstrate fast continuous rotation, fast stepping and slow stepping modes.
The demonstration program runs through the following steps:
1. 4 cycles * [ Continuous mode_ CW (0.1s) – pause ( 0.5s) - Continuous mode CCW (0.1s) – pause ( 0.5s) ]
– Average current 50 mA
2. Pause -1s
3. 10 cycles * [ Continuous mode_ CW (0.1s) - Continuous mode CCW (0.1s) ] – Average current 110 mA
4. Pause -1s
5. 10 cycles * [ PWM_CW-pulse (10 ms) – pause (200 ms)] – Average current 5 mA
6. 10 cycles * [ PWM_CCW-pulse (10 ms) – pause (200 ms)] – Average current 5 mA
7. 10 cycles * [ PWM_CW-pulse (10 ms) – pause (200 ms)] – Average current 5 mA
8. 10 cycles * [ PWM_CCW-pulse (10 ms) – pause (200 ms)] – Average current 5 mA
9. 90 cycles * [ PWM_CW-pulse (0.5 ms) – pause (32 ms)] – Average current 1.5 mA
10. 90 cycles * [ PWM_CCW-pulse (0.5 ms) – pause (32 ms)] – Average current 1.5 mA
11. 90 cycles * [ PWM_CW-pulse (0.5 ms) – pause (32 ms)] – Average current 1.5 mA
12. 90 cycles * [ PWM_CCW-pulse (0.5 ms) – pause (32 ms)] – Average current 1.5 mA
13. 30 cycles * [ PWM_CW-pulse (1 ms) – pause (209 ms)] – Average current 0.5 mA
14. Pause -1s
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