Известны кому-нибудь подобные девайсы? Очень не хочется усложнять схему и понижать надежность за счет дополнительных датчиков. 😦 У бесколлекторного обороты вроде меряются нормально свободной обмоткой, а вот у коллекторного как?
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Может можно по зависимости тока и напряжения?
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