A device that converts various forms of energy, when given an input, to rotating or linear mechanical motion such as a motor.

The area between the rotating and stationary members of an electric motor.

Electrical current flow, usually generated by the utilities at 60 Hz, which continuously reverses direction in the middle of its cycle. Mathematically, it follows a sine wave; it travels from zero, then reaches a maximum in one direction, decreases to zero, then reverses to reach a maximum in the opposite direction.

The temperature of the medium, usually air, around a device such as a motor or drive.

The standard unit of electrical current, or rate of electron flow. A closed-loop electrical circuit with one volt of potential difference across one Ohm of resistance causes one ampere of current to flow.

The armature is the rotating member of an electric motor. In brush-type DC motors, it consists of the main current carrying windings (conductors) in the rotor. The commutator switches the power supply to the armature windings to generate a magnetic field.

Also known as counter emf (cemf), it is the voltage produced across motor windings, due to the winding turns being cut by a magnetic field, during rotation of the motor. The back-emf is directly proportional to rotor velocity and opposite in polarity to the applied voltage. This static voltage arises from the generator action in a motor, even if th [..]

In a mechanical system, backlash is the relative motion between two devices, connected by a coupler, gear, screw, etc.

A section of the DC drive that converts the AC power supply into a DC source.

The current conducting material, usually carbon or graphite, which rests directly on the commutator of brush-type DC motor. They transmit current from the power supply to the armature.