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Three-phase power contains three simultaneous sinusoidal or other alternating voltage patterns, typically 120° out of phase with each other. Higher power efficiency and smoothness of operation is possible with three-phase operation. Three-phase power is most typically used for industrial or high power motors.
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Integral encoders are attached for angular position signal. These encoders may include absolute or incremental encoders and a number of different encoder signal types.
Integral resolvers indicate angular position. Resolvers often rely on magnetic fields and are typically very robust; they are sometimes specified for harsh environments.
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Refers to the base units for specifications such as diameter, length, and threading. Combinations are possible and this information is not known for some products.
Metric units such as millimeters or centimeters are used for primary dimensions as the shaft size, mounting geometry, etc.
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Square motor bodies have a square or rectangular shape.
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NEMA frame sizes conform to a standard size and mounting configuration identified by the National Electrical Manufacturers Association (NEMA). Only numerical sizes are searchable in this field.
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Open-frame of frameless enclosures have minimal or frame-like support, but no overall casing.
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
Totally enclosed motors have an enclosure that prevents free exchange of air between the inside and the outside of the enclosure. Common ratings are TEFC (fan-cooled) and TENV (non-ventilated); this is not an airtight rating. These motors are most frequently used in potentially contaminated environments.
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Drip-proof motors contain ventilation openings that are designed so that drops of liquid or solid particles falling from any angle within 15 degrees of vertical cannot enter the motor.
Motors with an IP rating of IPx1 through IPx9 are considered drip-proof.
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Clean rooms are classified by particulate size and density in the ambient air. One such rating method classifies rooms according to number of particles larger than 0.5 micron in one cubic foot of air. There are various governmental, metric, and international standards. Motors rated for suitability in a clean room will identify the particular standard for which they are rated.
Explosion-proof motors have totally enclosed housings that are constructed to withstand internal explosion of a specified gas, vapor, or dust. Should such an explosion occur, the enclosure would prevent the ignition or explosion of the gas or vapor surrounding the motor enclosure. Several explosion-proof ratings are governed by Underwriter's Laboratories (UL).
Radiation-hardened motors are constructed of materials designed to withstand high-energy gamma radiation. Ratings are expressed in units such as permissible RADs in total accumulated dose (TAD).
Vacuum-rated motors incorporate features such as lubricant vapor pressure below rated ambient vacuum and construction techniques.
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