Variable transmissions are used in industrial applications to alter the speed of an output shaft

Adjustable speed drives alter the speed of a driven shaft to a speed selected by an operator

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

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

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

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

Piezoelectric motors use a piezoelectric ceramic element to produce ultrasonic vibrations of an appropriate type in a stator structure. The consequent movement can either be rotational or linear depending on the design of the structure

Stepper motors use a magnetic field to move a rotor in small angular steps or fractions of steps. They provide precise positioning and ease of use, especially in low acceleration or static load applications

Linear motors generate force only in the direction of travel. They are capable of extremely high speeds, quick acceleration, and accurate positioning

Stepper motor drives power unipolar and bipolar stepper motors in full step, half step, and microstep motion control applications

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

Motor speed controllers are electronic devices that control motor speed. They carry specifications for drive type, product classification, electrical ratings, and operating parameters

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

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

AC servomotors are responsive, high-acceleration motors typically constructed as permanent magnet synchronous motors