Home > Power Transmission > Electric Motors

Electric Motors

We offer both a complete line of AC as well as DC electric motors for applications that range from industrial, light duty and agricultural. At USA Roller Chain and Sprockets we don't just supply our clients with motors. We shop, compare, and offer what is going to be cost-effective while still meeting the applications requirements as well as the customers' expectations. While being able to supply some of the "bigger names" in the electric motor marketplace we have made it a point to not partner with any brand specifically so we can offer our customers a non-biased recommendation and quote. We supply services to end users, OEMs, and resellers around the world on a daily basis.

Types of Electric Motors We Supply:
  • Open Drip Proof (ODP) Motors
  • Premium Efficiency Closed Motors
  • Premium Efficiency Severe Duty Motors
  • Fraction Horse Power (FHP) Motors
  • Farm Duty Motors (Agricultural)
  • Explosion Proof Motors (Rigid and C-Face)
  • Close-Coupled Pump Motors
  • Vertical Hollow Shaft Motors
  • Gearmotors

What an Electric Motor is

Essentially, the basic purpose and functionality of an electric motor is to convert electric energy into mechanical energy to be used for rotational force. A standard electric motor will consist of a rotor, bearings, stator, air gap, windings, and commutator.

The rotor is essentially the moving part of the motor which turns the shaft, it will usually have conductors laid into it to carry currents thus interacting with the magnetic field in the stator to generate the force that will in-turn rotate the shaft. But some rotors will have permeant magnets which leave the stator to hold the conductors (in this type). Electric motors can be powered by both direct current (DC) and alternating currents (AC) This is much cleaner and efficient than using other means of energy such as natural gas.

The bearings in an electric motor are used to support the rotor and allow it to turn on its axis. Which the housing in-turn supports the bearing or bearings and the shaft where forces will be applied is extended through the bearing.

The stator is the stationary portion of the motors electromagnetic circuitry and will in most cases consist of magnets or windings. The core of the stator consists of thin metal sheets that will later reduce energy losses versus a solid core.

The air gap represents the distance between the rotor and stator. Unsurprisingly, the air gap plays a major importance when it comes to an electric motors performance. The larger an air gap is a more magnetizing current is needed, and there is a threat of having noise as well as mechanical problems. Because of this, most manufacturers aim towards making this as small as possible.

Windings are the wires that are laid in coils around a laminated soft iron magnetic pole. This creates magnetic poles when energized with a DC or AC current. There are two primary pole types used in the industry and they are "salient-pole" or "nonsalient-pole" . The salient-pole configuration is where there is winding around the pole below the face. For the nonsalient-pole (distributed field or round-rotor) the winding will be distributed in pole face slots.

A commutator is used for switching the input of most DC motors and certain AC motors consisting of slip-ring segments insulated from each other and from the motor's shaft. The armature current is supplied through the stationary brushes that are in contact with the revolving communicator thus causing the required current reversal, which applies power in the most optimal manner as the rotor rotates from pole to pole.

How Electric Motors Work


Electric Motor History