# Generating using a DC brushed motor

• lucy_b14
In summary, the conversation discusses the possibility of using a DC brushed motor as a generator and calculating the potential power output. Tips and equations for determining output current and power are suggested, along with the need for a snubber/filter circuit to clean up the output voltage. The idea of using a brushless DC motor is also brought up, but it is noted that this would require a more complex control system.
lucy_b14
Good Evening

I'm interested in the possibility of using a DC brushed motor as a generator (ie running it in reverse - mechanically turning the shaft to produce electricity).

However, I have no idea how to calculate the power I could potentially achieve. Any tips or equations in particular would be greatly appreciated.

Thanks

lucy_b14 said:
Good Evening

I'm interested in the possibility of using a DC brushed motor as a generator (ie running it in reverse - mechanically turning the shaft to produce electricity).

However, I have no idea how to calculate the power I could potentially achieve. Any tips or equations in particular would be greatly appreciated.

Thanks

A good start would be to look at the specifications for the motor's normal operation. What is the input current listed for the specified DC input voltage? That will give you a pretty good ballpark idea of what the output current will be when you are turning the motor fast enough to generate the specified voltage. Motors are pretty efficient, so you may only have to derate the motor numbers by a couple tens of percent to get the generator numbers.

Be sure to calculate the associated powers, so you know what kind of input mechanical power will be required to get that output electrical power.

Oh, and the output of DC motors is generally pretty noisy, due to flyback impulses when the brushes are switching. Be sure to plan on an output snubber/filter circuit to clean up the DC output voltage.

Please excuse me if this comment is stupid, but would it not be possible to use a brushless DC motor - and then there wouldn't be an issue of a noisy output signal ?

Ah, You need a more complex control system to run a brushless dc motor correct ?

## 1. How does a DC brushed motor work?

A DC brushed motor works by using an electrical current to create a magnetic field that interacts with the permanent magnets in the motor. This interaction creates rotational motion, which is then transferred to the motor's shaft.

## 2. What is the advantage of using a DC brushed motor?

The main advantage of using a DC brushed motor is its simplicity and cost-effectiveness. These motors are easy to control and are widely available, making them a popular choice for many applications.

## 3. Can a DC brushed motor be reversed?

Yes, a DC brushed motor can be reversed by simply reversing the direction of the electrical current. This is commonly done by using a motor controller to change the polarity of the power supply.

## 4. What are the limitations of a DC brushed motor?

One limitation of a DC brushed motor is its relatively low efficiency compared to other types of motors. Additionally, these motors require regular maintenance due to the brushes wearing down over time.

## 5. How do I choose the right DC brushed motor for my application?

The key factors to consider when choosing a DC brushed motor for your application include the required torque, speed, and power output. It's also important to consider the motor's size, voltage, and current requirements, as well as any environmental factors such as temperature and humidity. Consulting with a motor specialist can also help ensure you select the right motor for your specific needs.

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