Mouser Electronics White Paper
The response speed and flexibility of PiezoHapt actuators
set them apart from traditional ERM actuators. For example,
while ERMs are limited to predefined vibration amplitudes,
PiezoHapt actuators vary their amplitude with drive voltage,
allowing for precise and dynamic haptic patterns (Figure 7).
PiezoHapt actuators rise 1/25th faster than ERMs,
achieving a rise time of 0.004 seconds or less,
compared to 0.116 seconds for ERMs (Figure 8).
These actuators' ability to create delicately controlled vibration
patterns with lower power consumption further expands the
possibilities for haptic feedback utilization (Table 1).
Figure 9 and Table 2 compare PiezoHapt and PowerHap actuators,
highlighting the strengths and parameters of each type.
Table 1: Summary of performance metrics comparing ERM actuators with PiezoHapt actuators (Source: TDK; *Measurement by TDK)
Eccentric Rotating Mass TDK PiezoHapt Actuator
Rise*
0.116 seconds 0.004 seconds (or lower)
Response
Slow Fast
Vibation Uniformity
Transmits vibration partially Vibrates the desired area uniformly
Displacement
Medium Large
Vibration Patterns
Monotonous Vibration is formed by pulse control
Power Consumption
15mW 5mW
Figure 9: Strengths comparison of PiezoHapt and PowerHap actuators. (Source: TDK, recreated by Mouser Electronics)
