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What is the Advantage of DC Motors over AC Motors?

In the electric power niche, over 70% of motors in use are induction motors. DC motors come with many advantages over the conventional AC designs. Here is a closer look at the main benefits you can get from using DC motors over AC motors.



DC Motors have Higher Starting Torque


Because DC motors have higher starting torque compared to AC motors, they are preferred for applications like electrical traction. They are considered ideal for dealing with heavy loads for starting conditions in machines such as locomotives and cranes. Note that there is a wide range of DC motors for higher starting torque to match your applications.


They can Easily Control Speed


Unlike most AC motors in the market, DC motors are capable to control speed above/below the rated levels. For example, the DC shunt motors are easy to vary the speed safely. This means that they can be used on a wide range of applications. This makes them ideal for producers who need to vary production rates during different shifts or seasons.




DC Motors do not have Harmonic Effect


One of the notable things about induction motors is the harmonic effect. Harmonic is a voltage at a multiple of the primary frequency of the motor system, generated by induction of non-linear loads like discharge lighting or saturated magnetic devices. In most electric motors, harmonic effect results in heating, noise, and harmonic current in the rotor. However, DC motors are better because they do not create any harmonics and you can operate without worrying about associated problems.




The Motors are Easy to Promptly Control


One fact about most motors is that controlling them fast and accurately is never simple. However, DC motors have moved away from the problem. For example, you can use DC motors for applications that require immediate start, reverse movements and stopping for optimal performance.



DC Motors are better for Low-Cost Operations


Many people opt for DC motors as opposed to others because they are cheaper. This is especially true when dealing with fractional HP applications. Because DC motors have been around for more than 130 years, the installed base is also large and familiarity for maintenance impressive. Therefore, you are assured of easily getting a technician to diagnose and repair your DC motor at a low cost.



DC Motors have Fewer Rectification and Electronics Needs


When you install a DC motor, it requires less electronic and rectification on power electronics system circuit compared to the AC inverters. This means that you can directly fit the motor and start using it by feeding directly from the power source.



Easy Speed regulation


One of the primary reasons that make DC motors popular for commercial and home operations is the ease of speed regulation. You simply need to adjust the voltage terminal using a potentiometer. Therefore, if you need higher speed control, it is advisable to go for DC motor.


The above post demonstrates the superiority of DC motors to others such as AC models for your operations. However, it is prudent to work with a motors expert to ensure that the DC motor is the ideal option for your facility.