Piezo motors
Precise positioning application
Backlash can be a major problem in some systems - for example in focusing and scanning tasks, alignment or measurements. With its miniature motors, the Swedish company Piezomotor offers backlash-free precision movements that are unmatched by other motion technologies.
Backlash-free, precise and as small as possible: challenges that motor manufacturers are increasingly confronted with today. The solution is direct drives, which not only improve overall efficiency, but also eliminate problematic motion inaccuracies without gears. In contrast to conventional direct drives, piezoelectric motors from the Swedish company Piezomotor also offer the major advantage of self-locking: they guarantee backlash-free movements with nanometer or even sub-nanometer resolution.
Piezoelectricity causes certain ceramics to deform when a voltage is applied. Piezomotors use so-called piezo LEGS in their motors: ceramic legs that can be both extended and bent sideways by applying voltage. The legs, which are arranged in pairs, drive the linear and rotating motors and thus cause movement in the sub-micrometer to nanometer range.
The drive rod in the motor is in direct contact with the moving object and the piezo elements in the motor. The friction coupling between the legs and the drive rod results in the desired zero backlash, extremely short response time and high resolution. The direct drive also enables strong locking without power consumption at standstill, as clamping and propulsion are performed by the same actuators. The force capacity of a piezo LEGS motor depends on the volume of the piezo material used in the legs and can be scaled from a few Newtons up to several hundred Newtons.
Many users appreciate the zero backlash, high holding force when switched off and great miniaturization capability. As the piezo motors are also low-maintenance, vacuum-compatible and operate without magnetic fields, they are attractive for a wide range of OEM applications with a focus on high-precision positioning. pb
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