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ACTUATORS AT A GLANCE

Over the years, we have successfully developed a range of high-performance piezoelectric actuators. They include high-linearity near-hysteresis-free "Hi-Fi Stake" actuator, large displacement-cum-blocking force high-authority piezoelectric actuators (HAPA), and a wide range of flextensional actuator (FTA).

"Hi-Fi Stake" Piezoelectric Actuators

"Hi-Fi Stake" piezoelectric actuators are driven by lead-based relaxor-PT single crystals. They display large linear displacement responses, minimum strain hysteresis and can be used up to 60°C. Currently, versions with up to 50 µm in axial displacement and 14 kg/f in working load are available. We are now developing "Hi-Fi-Stake" actuators of higher working temperatures and versions suitable for cyrogenic use.

HAPA Piezoelectric Actuators

"HAPA" actuators are made possible via a patented 2-level "High-Bending-Stiffness Connector (HBSC)", which not only doubles the axial displacement of a piezoceramic stack but also doubles or triples its blocking force. Despite their compact sizes, displacement of up to 85 µm and blocking force of up to 2700N are available. They find applications when both large axial displacement and blocking forces are advantageous such as in active vibration control of precision instruments and machinery.

Cost-effective Flextensional Actuators (FTA)

We have also successfully developed a series of cost-effective Flextensional Actuators (FTA), covering a wide range of displacement and working load. The plot below summarises the operating range of the various displacement actuators currently available at MMT.

Stroke and blocking force (or max. working load) of MMT Piezoelectric Actuators of various designs

Stroke Maximum Load
15-40 N 40-100 N 120-240 N 250-500 N 500-2500 N
5-30 µm HFS-CE(*) HFS-HL(*)    
30-100 µm HFS-LS(*) ↑ 
↖  (*) "Hi-Fi Stake"
← actuators of various constructions
Linear, hysteresis-free
HAPA-(1+2)-85µm-1250N
HAPA-(2+2)-85µm-1700N
HAPA-(3+3)-85µm-2500N
100-250 µm   FTA-175-70
175µm-70N
FTA-200-140
200µm-140N
FTA-200-250
210µm-260N
HD-FTA-250-800 (*)
250µm-785N
250-400 µm FTA-300-40
310µm-40N
FTA-350-50
350µm-50N
FTA-350-130
350µm-130N
HD-FTA-350-400 (*)
350µm-400N
 
400-700 µm FTA-500-15
500µm-15N
  HD-FTA-450-200 (*)
450µm-220N
   
FTA-500-30
500µm-30N
HD-FTA-700-100 (*)
700µm-96N
     

(*) HFS-CE=Cost-Effective Hi-Fi Stake; HFS-LS=Large-Stroke Hi-Fi Stake; HFS-HL=High-Load Hi-Fi Stake; HD-FTA=HAPA driven FTA

ACTUATORS AT A GLANCE

Over the years, we have successfully developed a range of high-performance piezoelectric actuators. They include high-linearity near-hysteresis-free "Hi-Fi Stake" actuator, large displacement-cum-blocking force high-authority piezoelectric actuators (HAPA), and a wide range of flextensional actuator (FTA).

"Hi-Fi Stake" Piezoelectric Actuators

"Hi-Fi Stake" piezoelectric actuators are driven by lead-based relaxor-PT single crystals. They display large linear displacement responses, minimum strain hysteresis and can be used up to 60°C. Currently, versions with up to 50 µm in axial displacement and 14 kg/f in working load are available. We are now developing "Hi-Fi-Stake" actuators of higher working temperatures and versions suitable for cyrogenic use.

HAPA Piezoelectric Actuators

"HAPA" actuators are made possible via a patented 2-level "High-Bending-Stiffness Connector (HBSC)", which not only doubles the axial displacement of a piezoceramic stack but also doubles or triples its blocking force. Despite their compact sizes, displacement of up to 85 µm and blocking force of up to 2700N are available. They find applications when both large axial displacement and blocking forces are advantageous such as in active vibration control of precision instruments and machinery.

Cost-effective Flextensional Actuators (FTA)

We have also successfully developed a series of cost-effective Flextensional Actuators (FTA), covering a wide range of displacement and working load. The plot below summarises the operating range of the various displacement actuators currently available at MMT.

Piezo Actuators