Power Efficiency of Linear Piezo Electric Motors

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Discussion Overview

The discussion centers on the power efficiency of linear piezoelectric motors, specifically seeking quantitative efficiency values in percentile terms. Participants explore various aspects of piezoelectric motors, including types and operational characteristics, while also considering the challenges in obtaining specific efficiency numbers.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants express a desire for specific efficiency numbers for linear piezoelectric motors, noting a lack of readily available data online.
  • There is a suggestion to calculate efficiency using a method involving electrical power input and mechanical power output derived from a motor's datasheet.
  • One participant mentions that while the motor itself may exceed 99% efficiency, the overall system efficiency is affected by the controller and driver, which may not be as efficient.
  • Concerns are raised about the efficiency of energy recovery in the inchworm motor's controller, particularly in low-power applications where cost considerations may hinder optimal design.
  • Participants discuss the impact of high voltages and frequencies on heat generation and inefficiency in piezoelectric systems.

Areas of Agreement / Disagreement

Participants generally agree on the complexity of determining efficiency due to the involvement of multiple components (motor, controller, driver) but do not reach a consensus on specific efficiency values or the overall efficiency of different configurations.

Contextual Notes

The discussion highlights the dependence on specific motor types and configurations, as well as the challenges in measuring and calculating efficiency accurately. There are unresolved assumptions regarding the design and operational conditions of the motors discussed.

Who May Find This Useful

This discussion may be of interest to engineers and researchers working with piezoelectric motors, as well as those involved in the design and optimization of motor control systems.

Ahmedbadr132
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TL;DR
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.
 
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russ_watters said:
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 .
 
Ahmedbadr132 said:
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.
 
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Ahmedbadr132 said:
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.
 

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