Hello i have done my research and have found varying information relating to the speed at which you must drive a motor to get a desired output and that it is dependent upon back EMF however i am very interested in how much torque i require to rotate the motor.
I have a model aircraft engine and wish to use pulleys or gears to get a good speed and torque to drive multiple brushless motors but i need to work out my ratios for the pulleys or gears (have not yet decided, probably pulleys) can anyone give me any insight.
I am looking for equations to be applied to any brushless motor to calculate the generation voltage, amperage and the required torque based upon any specifications of a motor.
How do I calculate the voltage, current and torque for a BLDC motor? Can I find this information in a datasheet?
Answer
As a rough guide, you can expect a motor used as a generator to produce the voltage it required as a motor at the speed at which it operated as a motor. At full load, the torque required is comparable to the torque it produced at full load as a motor. You must consider that a brushless DC motor produces AC as a generator. You must also consider losses in the motor that are comparable to losses operating as a generator.
That guide is applicable to any motor, but some types of motors require external circuitry for use as generators just as a brushless DC motor requires external circuitry for use as a motor, but will generate AC without external circuitry. Some types of motors require internal modifications for use as generators.
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