Flexibility and Ease of Control:
DC motors are preferred over other types of motors, such as AC motors, due to their flexibility and ease of control. DC motors can be easily controlled in terms of their speed and torque, making them suitable for various applications. The direction of rotation of a DC motor can also be easily changed by reversing the polarity of the supply voltage. This level of control allows for precise and efficient operation of the motor in different scenarios.

Lower Losses:
DC motors typically have lower losses compared to AC motors. This is because DC motors do not experience as much power loss due to the absence of an AC-to-DC conversion process. In AC motors, the power is first converted from AC to DC before being used to drive the motor. This conversion process results in energy losses due to the inherent inefficiencies of the conversion circuitry. Since DC motors operate directly on DC power, these losses are eliminated or significantly reduced.

Improved Power Factor of the System:
DC motors have a power factor that is close to unity, meaning they draw power from the electrical supply with minimal reactive power. This is in contrast to AC motors, which often have a lower power factor and draw more reactive power. A low power factor can result in increased electricity consumption, higher energy costs, and additional strain on the power distribution system. The improved power factor of DC motors, therefore, makes them more energy-efficient and reduces the overall burden on the electrical system.

Conclusion:
In summary, despite the heavy initial investments required, DC motors are preferred due to their flexibility and ease of control, lower losses compared to AC motors, and improved power factor of the system. These advantages make DC motors suitable for a wide range of applications where precise control, efficiency, and power factor correction are important considerations.