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What would cause a 3 phase motor to switching rotational direction?
I'm not--NOT--an electrician, so take this with a grain of salt (or a milli-amp). But, it seems to me that maybe the wiring on the phases is backwards. Maybe switching two of the main wires will reverse the direction. Oh, and stand back when you plug it in.
What size generator do you need to move a 30 hp electric motor?
A 5 kW generator would turn it over but if the full 30 hp of mechanical power is needed, that would require about 30 kW of electric power from the generator.
Will an electric shock cause a nosebleed?
I just gave myself an electric shock while TIG welding, and got a nosebleed, so it would appear the answer is yes.
How can you determine if an electric motor is 50HZ or 60HZ if there is no name plate?
One way would be to hook it up to a supply (by itself, with no load) and measure the speed with a contact tachometer. If your supply is 60Hz, and the motor speed corresponded to one of the standard motor speeds, it would be a pretty safe bet you had a 60Hz motor. If the speed was about 20% faster than a standard speed, the motor is probably a 50Hz motor. Or 20% slower if you were running a 60Hz motor on 50Hz For instance, a 1750 RPM 50Hz motor would spin at about 2100 RPM if you ran it on 60Hz.
Why windings of a direct current motor are made of copper?
Copper is the best base metal for conducting electricity. Gold and silver are better but too expensive. If you used a poorer metal you would lose more power and it would also generate more heat which in a motor would be quite a lot. More heat would then cause more resistance which would cause more heat.
