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Why Are DC Motors Still Used Today?

If you check out a typical processing or manufacturing facility today, you may see a wide range of AC powered induction motors. Direct current applications saw a lot of use in the past, but many applications were replaced with AC current equipment. However, motors like the General Electric DC Motor 407AT still have their place in modern industry. Here are some reasons for their longevity.

The Only Choice

At one time, the only option available was DC motors. However, this period of prosperity for the DC motor soon came to an end. In fact, it only lasted about seventeen years (from 1871 until 1888). Thanks to Tesla, three phase power came into being and along with it, the AC induction motor.

The DC Motor is Not Obsolete

You might think once three phase AC power took over, equipment like the General Electric DC Motor 407AT might not exist. This not the case, because a standard induction motor only runs at one speed. So, what happens if you need to control the speed of equipment like a conveyor system? You could use gearboxes or an intricate system of pulleys, gears, or belts. Yet, this creates the need for more equipment with more things to break down and require maintenance. The best option is a DC motor.

Speed Control

You can control an AC motor speed if you vary the hertz. However, this is not very efficient. The best way to control DC motor speed involves varying the current with a device called a rheostat. When you control the current, you can precisely control the speed of a motor like the General Electric DC Motor 407AT. This is important for cranes, elevators, ski lifts, and extrusion equipment. But how do many facilities get DC power? They use special DC generators which use AC power.

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