Specifications1.Specifications1.3-phase asynchronous motors
2.IEC standard
3.OEM
4.Voltage:50HZ &60HZ;380V&415V
5.Protection class: IP54
Exchange "and" switch "originating in telephone communication system (PSTN). We often see in movies or TV before some old movies often see people on the telephone a couple of shakes madly (note not dial), and ac electric motor then said to me by XXX, after the telephone operator received requirements will take corresponding backcourt head in to terminal, can talk to each other. In fact this is the most primitive telephone exchange system, it is just a kind of artificial telephone switching system, is not automatic, and it's not what we want to talk about today, program-controlled switches, but we now speak of SPC exchange, that is, on the telephone exchange technology development. Since the United States bell invented the telephone in 1876, with the increasing of social demand and constantly improve the level of science and technology, telephone switching technology is in rapid change and development.
DONGFENG Brand Two Speed Motor
Specifications
1. DONGFENG Brand Two Speed Motor 2. 3000RPM-750RPM
3. Electrical motor
4. factory price best quality
5. 100% copper
The process can acmotor2.blogspot.com be divided into three stages: artificial exchange, exchange of mechanical and electrical and electronic exchange. As early as 1878 appeared a manual switchboard, it is by the operator to call in, obviously its efficiency is very low. 15 years hind leg into the system switches, it marks the switching electric motor low rpm from manual times into the mechanical and electrical switching times. This switch belongs to the "direct control" mode, that is, the user can through the telephone to dial directly controlled pulse stepper connector for lifting and spins. To complete the user automatically in between. This switch has realized automatic succeeded, but there is a low speed, low efficiency, big noise and mechanical wear serious shortcomings and so on.
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