Home Generators Difference between AC and DC generators: An easy to understand guide

    Difference between AC and DC generators: An easy to understand guide

    There is a huge difference between AC and DC generators although the names might seem the same to you. These two types of generators provide completely different outcomes. They both provide currents, but the final currents are different in terms of the way they move, their mechanism, their design, and their use. Here, Linquip will explain the difference between AC and DC generators and answer all the questions that may cross your mind while reading about the two. Let us first briefly introduce AC generators and DC generators:

    What is an AC generator?

    AC generator is considered an electrical generator for converting mechanical energy into electrical energy. This energy is in the form of alternating current or alternative EMF. They work according to the principles of electromagnetic induction which states that electromotive force (EMF) is generated in a current-carrying conductor that cuts a uniform magnetic field. This can either be achieved by rotating a conducting coil in a static magnetic field, or by rotating the magnetic field that contains the stationary conductor. The preferred arrangement is to keep the coil stationary because it is easier to draw induced alternating current from a stationary armature coil than a rotating coil.

    What is a DC generator?

    DC generators convert mechanical energy into DC electricity which is short for Direct Current. DC generators work according to the principles of energetically induced electromotive force.

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    Now, let’s dig deeper into the difference between AC and DC generators and learn about their use. Then, you’ll be able to decide which one suits your needs:

    difference between ac and dc generator - Linquip

    AC Generator vs Dc Generator

    • The Design and Mechanism
    • Use and Maintenance
    • Connectivity

    AC vs. DC: The Design and Mechanism

    The Diff BW AC and DC Generator in terms of design is that the AC generators’ current moves through the fixed coil. The flow of current remains in the opposite direction, with the help of a moving magnet. While in DC generators the coil moves in a fixed field and the current flow with this movement, so no fixed coils for DC generators.

    One of the similarities between AC and DC generators is that they both have slip rings (created from metal) and also an armature coil. The armature connects to the outside circuit with the help of a connection that directly affects the type of the produced current.

    The AC generator has two metal rings that rotate with the armature coil simultaneously. Both ends of the armature are connected to a separate slip ring with a carbon brush to enable this process. But the AC generators contain a fixed brush. The brushes are the elements receiving the current flowing through the slip rings. However, both the end of the outside circuit and the end of the armature are connected to one brush.

    Another difference between AC and DC generators in this regard is that while AC generators have 2 slip rings, DC generators have only one. The two semi-circular metal rings in the commutator are insulated from one another. The ends of the armature in the DC generator are connected to one-half of the commutator. Then each half-turn rotation results in a reverse direction of the current in the armature.

    The 180-degree rotation between magnetic poles by the armature then takes the current from its highest point to zero. The rings in an AC generator don’t have commutators while DC generators have Split-ring commutators. Plus, the smooth and uninterrupted surface of the AC slip-rings is highly efficient and does not wear quickly while both brushes of a DC generator are less efficient than AC generator since they wear out quickly. The efficiency of the brushes in the AC generator decreases the short circuit possibility but the possibility is high in DC generators.

    Although both AC and DC generators have a different approach toward collecting and transferring induced electromotive forces in the external circuit, they both use electromagnetic principles to reach the desired outcome. So there’s another difference between AC generator and DC generator. This difference is due to the connection between armature and the external circuit in these two types of generators.

    The difference between AC and DC generators: Use and Maintenance

    The output voltage produced by AC generators is called alternators. The normal frequency of alternators is 60Hz for America, Europe, and Japan. This output voltage differs in time and amplitude. DC generators produce a steady output voltage, suitable to power large motors. While DC generators are mainly used to supply power for large motors, AC generators are used for smaller ones. You can power your electrical appliances at home with the help of AC like food mixers, electrical fixtures, etc.

    The Diff BW AC and DC Generator in terms of maintenance are huge. DC generators require constant maintenance and are less reliable while AC generators need very little maintenance and are more reliable.

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    AC vs. DC generator: Connectivity

    Another difference between AC and DC generators is their connectivity. DC generators have a design that provides seamless connectivity with efficient power flow. This is mostly because they don’t need any transfer switch. In the case of AC generators, however, they require much more effort to transfer electricity to remote sections of the grid, making it less efficient when it comes to connectivity.

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    Different types of AC and DC generators

    AC generators

    • Single Phase generator
    • Synchronous generator
    • Three Phase generator
    • Induction generator

    DC generators

    • Self-excited DC generator
      Series wound generator
      Shunt-wound generator
      Compound wound generator
    • Separately-excited DC generator

    AC and DC generators have different types for different uses and needs. Some of them are as follows:

    AC generators have different types such as Single Phase generators, Synchronous generator, three Phase generators, Induction generator, etc.

    • Single Phase generators: Single-phase generator (also known as a single-phase alternator) is an alternating current electrical generator that produces a single, continuously alternating voltage. Single-phase generators can be used to generate power in single-phase electric power systems.
    • Synchronous generators: The synchronous generator or alternator is an electrical machine that converts the mechanical power from a prime mover into an AC electrical power at a particular voltage and frequency. The synchronous motor always runs at a constant speed called synchronous speed.
    • Three-phase generators: Three-phase generators work by producing three separate waves of AC power that operate in a sequence, ensuring that there is always a continuous flow of energy and that the power level never dips as it does with single-phase generators.
    • Induction generators: An induction generator is also known as an asynchronous generator that has a working principle similar to that of an AC generator. The only difference between a normal AC generator and an induction generator is that the induction generator is a rotating device. It is known as asynchronous because the speed of the induction generator is less than that of the synchronous generator. They find applications in mixers and grinders.

    DC generators mainly have two types: Self-excited DC generator and Separately-excited DC generator. Their armature connection is the same and that’s why they are categorized as DC generators.

    • Self Excited: In a self-excited type, the field coils are energized from the generated current within the generator. These types of generators can further be classified into Series wound generators, Shunt wound generators, and compound wound generators.

      Series wound: field winding in series with the armature winding
      Shunt-wound: field winding in parallel with the armature winding
      Compound wound: the combination of series and shunt winding

    • Separately Excited: In a separately excited type generator, the field coils are energized from an independent exterior DC source.

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    Which one is better: AC generator or DC generator?

    Finding the best one between AC generator vs Dc generator largely depends on the way you want to use it and your desired outcome. Each of them has several advantages enabling you to get the most out of them, such as:

    DC Generators advantages

    • Smooth Voltage
    • Suitability for large motors
    • Simple design

    AC Generators advantages

    • Suitability for electrical appliances and small motors
    • Low maintenance needs
    • Easy distribution of the output with a transformer
    • Efficiency
    • Losses are relatively fewer than DC Generators
    • Transmission link size might be thinner because of the step-up feature
    • AC generators can be easily stepped up and stepped down through transformers.
    • The size of the AC generators is relatively smaller than DC generators.

    It’s also good to know that DC generators are more affordable compared to AC generators. AC generators cost a little more.

    So, now you know everything you needed to know about the difference between these two! Do you think the difference between AC and DC generator affects other aspects of your life or the industry other than what we mentioned above? Share your thoughts with us in the comment section. And feel free to sign up on our website if you want our experts to answer your most complicated questions regarding this field.

    Linquip Content Managment Team

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