There are two types of power to make a motor run and these are the AC current and the DC current. In an everyday residential set-up, AC simply stands for alternating current and it is usually supplied by an electrical outlet connected to a much larger power plant. DC power, on the other hand, stands for direct current and it is usually supplied by battery packs.
To know more about AC and DC electric motors, read further below. This article should enlighten you when it comes to finding the right motor to run a certain application or system. AC and DC electric motors follow a more complicated and an entirely different explanation than stated above.
AC Electric Motors
AC or alternating current is run by a variable frequency drive. The types of motors that run on AC power usually consist of a rotor, stator, and a few other smaller parts. The stator is wrapped by coils where the alternating current passes through, which then produces a rotating magnetic field. The rotor is connected to an output shaft and as it is being rotated by the coils. The shaft, in turn, produces a torque that makes the rest of the system work.
There are two types of AC electric motors used these days and they are the induction motor and the synchronous motor. The induction motor uses the magnetic field of the rotor that’s produced by an induced current. On the other hand, the synchronous motor rotates precisely at the frequency that’s being supplied to it.
DC Electric Motors
DC electric motors are powered by a direct current, usually coming from mechanically commutated machines. Their voltage is induced by the rotating armature winding, a permanent magnet, or a non-rotating armature field frame winding that produces a static field.
DC electric motors may use different connectors to the field and armature winding to come up with certain torque and speed regulation. The speed of DC electric motors may possibly be controlled by a change in the winding, the field frame current, or the voltage applied to it.
AC versus DC Electric Motors
Whether you need AC or DC electric motors is entirely up to the application or system that you want to run. If you need a machine which speed can be externally controlled, then you need to attach a DC motor. On the other hand, if you need a system that works on a higher level of performance at all times, what you should AC motors. This is because AC motors can run on a single phase to a three-phase performance while DC motors are always on the single-phase mode.
However, today’s technology has produced AC motors that come equipped with an electronic speed controller, which is also known as the variable frequency drive. These types of AC motors are actually more economical and least expensive. Another advantage of using AC electric motors over DC is the fact that the latter has many moving parts that can be quite expensive to replace or repair. This is not true with AC electric motors, which is why its application is quite popular across all industries today.