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Calculate the amplitude of the EMF of an alternator with minimum motor data

Calculate the amplitude of the EMF of an alternator with minimum motor data

Calculate the amplitude of the EMF of an alternator with minimum motor data

(OP)
Hi,

I am designing a very low speed alternator for small power devices, and I would like to select the correct motor for my application. The problem is, the cheap ones provide very little data about the motor mode, and I still need to select one that will provide the necessary voltage for the design speed.

General question: Is it possible to infer the amplitude of the EMF of a generator, based on limited motor-mode data such as: nominal speed, nominal power, nominal voltage, number of poles (frequency if AC motor)? Is it dependent on the motor type?

Application: I noticed a single phase AC synchronous motor; it uses (or gives, who knows) 3.5W of power at 4rpm under AC30V 50Hz. Is it safe to assume it's going to produce AC30V under 4rpm if 4rpm is the no load speed? If not, why?

Thanks in advance.

Best regards,
Mister Mystere

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