Electric motors are available to suit most applications. Electric Motors have multiple variables to consider when making a selection. Understanding the terms used with electric motors is important to making a selection.
Basic Electric Motor Terms:
- Horsepower: Determined by the equipment requirements, total load, operating conditions, and speed.
- Voltage: The voltage of a motor is determined by the supply to which it is attached. The common voltages are 115, 200, 208, 230, 460, 575.
- Phase: The most common power supplies are either single- or three-phase.
- Common Motor Types: Totally Enclosed(TE), Totally Enclosed Non-Ventilated(TENV), Energy Efficient (EE or XL), or Totally Enclosed Fan Cooled (TEFC).
- Cycles: 60 Hz (cycles per second) AC power is common throughout the US and 50 Hz is common in many foreign countries.
An example of the motor designation is:
- 1/2 HP- 230V- 3 Ph.60 Hz. TEFC or 1/2HP/230V/3Ph/60 Hz. TEFC
This is translated as 1/2 Horsepower, 230 Volts, 3 Phase, 60 Hertz, Totally Enclosed Fan Cooled.
- Totally Enclosed: A motor enclosure, which prevents free exchange of air between the inside and the outside of the enclosure but is not airtight. This is the standard motor on many conveyors.
- Totally Enclosed Fan-Cooled: Provides for exterior cooling by means of a fan integral with the motor, but external to the enclosed parts.
- Totally Enclosed Non-Ventilated: Has no provisions for external cooling of the enclosed parts. The motor is cooled by heat radiation from the exterior surfaces to the surrounding atmosphere.
- Energy Efficient: Energy efficiency motors are specially designed to be more effective at converting electrical input to mechanical output.