DC to AC inverters are used for converting direct current (DC) into alternating current (AC). They are also known as DC to AC converters

DC motors are most commonly used in variable speed and torque applications. They include brushless and gear motors, as well as servomotors

DC to AC converter chips transfer a DC input into AC power by using switching, inversion, or other technology

Power supplies are devices that produce AC or DC power.  This grouping includes current sources, DC power supplies, AC-DC adapters, DC-DC converters, AC power sources, and DC-AC inverters

AC motors include single, multiphase, universal, induction, synchronous, and gear motors. They also include servomotors.  

AC-DC adapters accept AC input voltage directly from a wall outlet, and output DC voltage

DC-DC converters accept DC input and provide regulated and/or isolated DC output in various applications including computer flash memory, telecommunications equipment, and process control systems

AC to DC converter chips transfer an AC input into DC power using switching (MOSFET, IGBT) or rectification (diodes, Schottky diodes

DC-DC converter chips provide a regulated DC voltage output from a different, unregulated input voltage. 

DC servomotors are generally small and powerful for their size, and easy to control. Common types of DC servomotors include brushless or gear motors

DC motor drives act as the interface and power supply between a motion controller and a DC motor

Gearmotors consist of an AC or DC motor with an integral gearbox or gear head that steps delivered speed up or down

AC motor drives interface controllers to AC motors. They match the control signals (voltage and power levels) as well as the signal type (analog or digital). They also provide power conversion, amplification, and the sequencing of waveform signals

DC power supplies accept an input power and output the desired form of DC power. Common types of DC power supplies include linear power supplies, switching power supplies, DC-DC converters, and silicon controlled rectifier (SCR) type power supplies

Motor controllers receive supply voltages and provide signals to motor drives that are interfaced to motors. They include a power supply, amplifier, user interface, and position control circuitry.