Power Efficiency of Linear Piezo Electric Motors

[Ahmedbadr132]

TL;DR Summary

What is the power efficiency of a linear piezo electric motor??

Hi
I want to know the power efficiency of linear piezo electric motors in percentile.

 

[russ_watters]

What research have you done?

 

[Ahmedbadr132]

What research have you done?

I want to know the number .
I did not find a number on the internet.
They just say it is efficient .

 

[Baluncore]

I want to know the power efficiency of linear piezo electric motors in percentile.

What type of piezoelectric motor?
https://en.wikipedia.org/wiki/Piezoelectric_motor

 

[Ahmedbadr132]

What type of piezoelectric motor?
https://en.wikipedia.org/wiki/Piezoelectric_motor

The inchworm motor

 

[jrmichler]

I want to know the power efficiency of linear piezo electric motors in percentile.

If you cannot find it directly, then you need to calculate it from a piezo motor datasheet. Here is the method:
1) Find the electrical power input to the motor drive in watts.
2) Find the speed/force curve of the motor. Pick a point on that curve. Calculate the mechanical power - it's the force times the speed. Make sure that you calculate the power output in watts.
3) Divide the mechanical power output by the electrical power input. That's your efficiency. Since you are dividing watts input by watts output, the answer is dimensionless. Efficiency is dimensionless.

 

[Baluncore]

I want to know the number .
I did not find a number on the internet.
They just say it is efficient .

The motor alone may be greater than 99% efficient, but the piezoelectric motor does not operate alone, it requires a controller and a driver.

The efficiency of the inchworm motor will be high if it has a well-designed electronic controller, that is able to recover energy during each step cycle. However, that is unlikely for such a low-power application, since economy of operation is irrelevant and the cost of the electronics is high.

Energy harvesting within the step cycle will tend to be inefficient, while ultrasonic step rates magnify the problem. Piezo elements operate on high voltages and low currents. Like CMOS logic, high voltages and high frequency leads to heat and inefficiency.

It is only problems of heat generation in multiple units, or lifetime wear, that will require more efficient operation of the controller-driver-motor combination.