Product category:
Precision Motors and Gears
News Release from: Unimatic Engineers | Subject: Piezo Legs rotary motor
Edited by the Engineeringtalk Editorial
Team on 20 September 2004
Piezo motor walks round in circles
A rotary version of the Piezo Legs motor is now available from Unimatic which is introducing it as a companion to the Piezo Legs linear motor/actuator.
A rotary version of the Piezo Legs motor is now available from Unimatic which is introducing it as a companion to the Piezo Legs linear motor/actuator It uses a similar operating principle to the original Piezo Legs linear motor, ie tiny piezoelectric legs are made to "walk", in this case driving around a shaft instead of creating linear motion
This article was originally published on Engineeringtalk on 26 Apr 2000 at 8.00am (UK)
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Each leg is a made of a ceramic laminate cantilevered from a base plate.
When subjected to an electrical impulse the leg deflects rather like a bimetallic strip.
By sequencing the pulses to a number of legs, a walking effect is created.
Like the legs, the electrical impulse is very small - so small in fact that they cannot spark, even in an explosive atmosphere.
It is a characteristic of the piezoceramic material that the legs are bistable and will maintain both the resting and extended position with no need for a constant electrical signal, further enhancing the intrinsic safety of the motor.
The low speed performance of the motor is phenomenal, with one rotation per week being achievable while maintaining accuracy to one ten millionth of a turn.
Maximum speed is 20rev/min.
Torque output is up to 0.08Nm, representing a considerable power density considering that it is 32mm long and 23mm diameter.
With no gearbox and no minimal moving within the motor, a long maintenance-free working life is guaranteed.
Potential applications for the new motor include crystal growing, electronics manufacture and assembly, medical and robotic tools for micro surgery, intrinsically safe machinery for explosive atmospheres, hygienic and sterile environments etc.
Unimatic can provide detailed advice on the best use of this innovative product, as well as offering integrated electromechanical solutions to potential users of this new technology. Request a free brochure from Unimatic Engineers ...
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