P-661 | PILine® High-Speed, Small OEM Piezo Linear Motors |
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- Patented Principle with High Holding Forces
- Velocity to 800 mm/s
- Acceleration to 20g
- Self-Locking
- 20,000 h MTBF
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PILine® Linear Motors-Smaller, Faster, More Effective
Despite their small size, PILine® P-661 linear motor drives generate higher driving and holding forces than conventional piezomotors.
They are based on a novel, patented ultrasonic drive developed by PI. At the heart of the system is a piezoceramic plate which is excited to produce high-frequency eigenmode oscillations. A friction tip attached to the plate moves along an inclined linear path at the eigenmode frequency. Through its contact with the friction bar, it drives the moving part of the mechanics forward or backwards. With each oscillatory cycle, the mechanics executes a step of a few nanometers; the macroscopic result is smooth motion with a virtually unlimited travel range.
High Speed and Acceleration, Self-Locking
PILine® piezomotor drives can provide accelerations of up to 20 g and speeds of up to 800 mm/s, together with high resolution and high holding force. Because the ceramic stator is pressed against the slider, holding forces are generated when the motor is at rest The result is very high position stability without the heat dissipation common in conventional linear motors.
Integration
These drives can be operated in any orientation. For best performance, both the drive housing and the friction bar must the mounted on flat surfaces. The environment must be kept clean, dry and free of dust.
Accessories
PILine® motors require a drive electronics for exciting the ultrasonic oscillations. The way of how to control this drive electronics either by analog or pulsed signals strongly depends on the electronics. Therefore the drive electronics is not include in the delivery and can be ordered separately.
Pulsed-Mode Operation: C-180, C-181, C-170
Pulsed operation is especially suited for applications requiring small steps or rapid end-to-end motion, as in microscopy, automation or similar applications. The motor can be controlled with 5 V TTL pulses connected to the signal input on the drive electronics. The width of the pulses will determine the approximate length of the steps the motor makes. The smallest possible step is about 50 nm, requiring a pulse of about 10 µs in duration. The pulse rate and width can beu sed to influence the step size and rate, thus determining the velocity. A flexible, programmable pulse generator with integrated C-181 driver is available as the C-170.161.
Analog Driver: C-184, C-185
The C-184 (OEM board) or C-185 (stand-alone) analog driver controls the motor speed as a function of a ±10 V analog input. With an external position sensor and a controller, it is thus possible to set up a very fast, closed-loop system. The M-663 stage with integrated linear encoder (see p. see page) can also be run with this driver.
Long Lifetime
PI has over 30 years experience with piezo technology and nanopositioning PILine® drives offer high precision and reliability, with over 20,000 hours MTBF. This is because PILine® piezo linear motor drives have no mechanical components such as shafts and gears which can cause failures in conventional motors.
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P-661 OEM piezo linear motor incl. C-180 drive electronics.
0.3 µm steps performed by P-661 piezomotor integrated in an M-662 translation stage.
P-661 dimensions in mm
The P-661 OEM piezo linear motor is used for the M-661 linear stage (front right). The C-180 OEM-board drive electronics (left) is also available as C-181 version in a box (background)
High-power pusher with PILine® piezo linear motor for automation
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