# Power Efficiency of Linear Piezo Electric Motors

• Ahmedbadr132
In summary, the efficiency of linear piezo electric motors can be calculated by dividing the mechanical power output by the electrical power input. The inchworm motor may have a high efficiency if it has a well-designed electronic controller, but energy harvesting within the step cycle can be inefficient. The motor's efficiency may only become a concern in cases of heat generation or wear.
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.

What research have you done?

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.

russ_watters
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.

## 1. What is the definition of power efficiency for linear piezo electric motors?

The power efficiency of a linear piezo electric motor refers to the ratio of the output power to the input power. It is a measure of how well the motor converts electrical energy into mechanical energy.

## 2. How is power efficiency measured for linear piezo electric motors?

Power efficiency for linear piezo electric motors is typically measured by comparing the input and output power using a power meter. The output power is measured by the force and displacement generated by the motor, while the input power is measured by the electrical current and voltage supplied to the motor.

## 3. What factors can affect the power efficiency of linear piezo electric motors?

The power efficiency of linear piezo electric motors can be affected by various factors such as the design and materials used in the motor, the operating conditions, and the load on the motor. Additionally, any friction or losses in the motor can also impact its power efficiency.

## 4. How can the power efficiency of linear piezo electric motors be improved?

There are several ways to improve the power efficiency of linear piezo electric motors. These include using high-quality materials with low losses, optimizing the motor design for maximum efficiency, and reducing friction through proper lubrication and precision manufacturing. Additionally, operating the motor at its optimal voltage and current can also improve its power efficiency.

## 5. What is a typical power efficiency range for linear piezo electric motors?

The power efficiency of linear piezo electric motors can vary depending on the specific motor and its operating conditions. However, on average, these motors have a power efficiency range of 70-90%. This means that they can convert a large portion of the input electrical energy into mechanical energy, making them highly efficient compared to other types of motors.

### Similar threads

• Electrical Engineering
Replies
7
Views
299
• Electrical Engineering
Replies
7
Views
857
• Electrical Engineering
Replies
7
Views
1K
• Electrical Engineering
Replies
12
Views
1K
• Electrical Engineering
Replies
3
Views
852
• Electrical Engineering
Replies
5
Views
904
• Electrical Engineering
Replies
9
Views
743
• Electrical Engineering
Replies
5
Views
1K
• Electrical Engineering
Replies
0
Views
77
• Electrical Engineering
Replies
17
Views
658