Which component is not typically used for supplying voltage in elevator systems?

In elevator systems, various components are used to supply the necessary voltage for operation, but certain methods are more common than others. A three-phase inverter is typically employed to convert direct current (DC) into alternating current (AC) and is utilized in applications where variable frequency drives are required, such as in modern electric elevators. However, in traditional elevator systems, the inverter is not commonly used to supply voltage directly.

Elevator systems mainly rely on components that provide either AC or DC power suitable for motor operation and control. For instance, a DC generator can supply the required voltage for older systems, and a three-phase full-wave rectifier is often used to convert AC power into the DC power that may be necessary for certain applications. An MG set, which includes a motor-generator, is a traditional method to supply power and is applicable in several types of mechanical systems, including elevators.

Thus, the three-phase inverter is not typically utilized for direct voltage supply in elevator systems when compared to the other mentioned components, aligning with the reason for its selection as the correct answer in this context.