Synchronous dc motors (SDCMs) have certain

advantages over the ac motors however, like the production

of ac motors (ACMs), their mass production

entails considerable costs. This article is devoted to the

possibility of creating SDCMs based on ACMs that

enable one to develop a new type of frequency-regulated

motor without the complete preparation of new

production.-Synchronous dc motors (SDCMs) have certain

advantages over the ac motors　however, like the production

of ac motors (ACMs), their mass production

entails considerable costs. This article is devoted to the

possibility of creating SDCMs based on ACMs that

enable one to develop a new type of frequency-regulated

motor without the complete preparation of new

production.