When using a 12V DC motor as a mini generator, you can generate anywhere from 2-50 amps of electricity, depending on the size of the motor. Generally, larger motors will produce more power and smaller motors will produce less. A 12V DC motor can be used to generate a maximum of 600 watts of electricity, with a current of 50 …
A brushed DC motor is appropriate for generator applications requiring a DC voltage output, while a brushless DC motor is suitable for AC voltage applications. If using a BLDC for DC voltage output, a voltage rectification circuit is needed.
I want to use a 12V DC Brushless permanent magnet motor as a wind powered electrical generator for a project. The motor is rated DC 12V and 1.20 amps. Once I reach an output of 12V does that means that I also have 1.2 Amps?
For example, consider a motor that puts out 100 W of mechanical power at 60 Hz rotation (3600 RPM) speed, at 24 V applied, and is 90% efficient. The electrical input power is (100 W)/90% = 111 W. That means the current is (111 W)/ (24 V) = 4.6 A.
A Full Guide: the Principles of DC Motors as Generators
The voltage and current output of a DC motor used as a generator can be controlled by adjusting the speed of rotation. Increasing the rotation speed typically results in higher voltage and current output.
Both brushed and brushless DC motors can be operated as generators. However, there are some important points to consider when designing the drive. Every now and then, I''m asked about the suitability of maxon DC motors for the use as a generator.
How to calculate Power of motor when used as a generator?
When used as a generator, a motor can generate approximately the same power that it requires for operation as a motor at rated speed and torque. In general, the voltage produced by a generator is directly proportional to speed. Power is proportional to voltage multiplied by current.
In a physically realizable 12V 300W motor does not output 300 W of mechanical power, so you will not get back anywhere close to 300 W. Motors are rated in mechanical Watts and kiloWatts, The expected output of a 300W motor is 300 mechanical Watts. The output will be directly related to speed.
Any DC motor with permanent magnets can easily be a generator. It doesn''t matter whether it is brushed or not; brushless motors make great generators but you will need to add a rectifier to get a DC output.
Can ANY DC brushless motor be used as a generator?
Use a DC to DC converter to regulate the output. Ensure the KV rating of the motor. The KV rating of the motor is the rating, which when multiplied to the input voltage value will give the value of the torque in RPM. E.g. If a motor has a value of 5KV is given a 12 Volt supply, then 5KV = 5000 V and 5000*12 = 60000 RPM.
