DC Servomotors Specifications

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Motor Construction

	Commutation
	Your choices are...
	Brush		Brush motors have the armature windings on the rotor. The magnetic fields are commutated via direct contact of brushes with the rotor commutator.
	Brushless		Brushless motors have their armature windings on the stator and the field on the rotor. They rely on internal noncontact sensing devices to activate external commutating electronics.
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	DC Motor Construction
	Your choices are...
	Compound Wound		Compound wound motors are designed with both a series and shunt field winding. They are often used where the primary load requirement is heavy starting torque, and adjustable speed is not required. They can exhibit speed variation from no-load to full-load. Applications include elevators, hoists and industrial shop equipment.
	Coreless / Slotless		Coreless and slotless motors incorporate cylindrical winding that is physically outside of a set of permanent magnets. Because the winding is laminated and excludes an iron cage, these designs have much lower inertia. They boast high acceleration, high efficiency, excellent speed control, and little to no vibration. They are commonly used as servomotors for process control applications.
	Disc Armature		Disc armatures are flat, pancake-shaped rotors that are driven by an axially, rather than radially, aligned magnetic field. The thin construction of these armatures can result in low inertia with resulting high acceleration.
	Permanent Magnet		Permanent magnets (PM) are embedded into the rotor assembly. The rotor aligns itself with the rotating magnetic field of the stator windings. PM motors exhibit constant speed with varying load (zero slip) and provide relatively high torque, good efficiency, and lower current draw than comparable synchronous motors.
	Series Wound		Series wound motors exhibit high starting torques for permanently attached loads. These motors are frequently used in heavy industrial applications.
	Shunt Wound		Shunt wound motors exhibit minimum speed variation through a load range and can be configured for constant horsepower over an adjustable speed range. Frequent applications include machine tools, fans, and blowers.
	Other		Unlisted motor construction.
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DC Motor Specifications

	DC Voltage
	Your choices are...
	6 Volt		Motor accepts 6V DC input voltage.
	9 Volt		Motor accepts 9V DC input voltage.
	12 Volt		Motor accepts 12V DC input voltage. .
	24 Volt		Motor accepts 24V DC input voltage.
	48 Volt		Motor accepts 48V DC input voltage.
	72 Volt		Motor accepts 72V DC input voltage.
	90 Volt		Motor accepts 90V DC input voltage.
	160 Volt		Motor accepts 160V DC input voltage.
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	Other DC Voltage		Design DC motor voltage.
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	Torque Constant
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Performance Specifications

	Output Power
	Your choices are...
	1/4 HP		Output for the motor is 1/4 hp.
	300 W		Output for the motor is 300 W.
	1/2 HP		Output for the motor is 1/2 hp.
	1 HP		Output for the motor is 1 hp.
	2 HP		Output for the motor is 2 hp.
	5 HP / 3.6 KW		Output for the motor is 5 hp or 3.6 kW.
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	Other Output Power		Mechanical power provided by the motor output.
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	Continuous Current		Continuous current is the maximum rated current that can be supplied to the motor windings without overheating.
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	Continuous Torque		Output torque capability of the motor under constant running conditions.
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	Rotor Inertia
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Gearmotor / Gearhead Options

	Geared		This category includes units with single integral gearheads, or replaceable / interchangeable gearhead options.
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	Gearing (if applicable)
	Your choices are...
	Bevel		Bevel gear sets have intersecting axes that are commonly, but not always, perpendicular. They mate via teeth on angled edges.
	Harmonic		Harmonic drives are extremely precise speed reduction systems, which transmit power via a rotating elliptical element that engages a flexible cup that then engages an internal gear, typically fixed. This power transmission delivers precise angular position in very high input-to-output ratio (50:1 & up) applications.
	Planetary		Planetary gear heads involve several gears per stage rather than one pinion-gear set. A "sun gear" drives multiple planet or satellite gears, which then mesh on the inside of an internal or annular gear to provide relatively high torque and power transmission ratings.
	Spur		Spur gear heads include one or more sets of pinion-gear sets, in which one pinion drives one gear. These sets can be stacked or cascaded to achieve higher reduction ratios.
	Worm		Worm gearing uses right-angled drives in which a worm drives a wheel coupled to the output shaft or shafts. This arrangement is used for high reduction and compact right-angle power transmission.
	Other		Unlisted or specialized gearing arrangement.
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	Gearbox Ratio:		Gearbox ratio is the ratio of input speed to output speed. A ratio greater than one indicates speed reduction, while a ratio less than one indicates speed increase.
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	Gearbox Efficiency:		Efficiency is the percentage of power or torque that is transferred through a gearbox. Losses occur due to factors such as friction and slippage inside the gearbox.
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Shaft Specifications

	Design Units		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.
	Your choices are...
	English		Base units such as inches or fractions of an inch for primary dimensions as the shaft size, mounting geometry, etc.
	Metric		Metric units such as millimeters or centimeters are used for primary dimensions as the shaft size, mounting geometry, etc.
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	Shaft Size		Diameter of the output shaft(s).
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	Shaft Speed		Shaft speed refers to the no-load rotational speed of the output shaft at a rated terminal voltage.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
	Orientation
	Your choices are...
	Double-ended		Two output shafts. This may be one coming out the front and one coming out the back, or two coming out from a transverse gearbox.
	Hollow		Hollow output shafts have a hole or bore that can accept a shaft.  Outputs with collets for tool bits are one example.
	In-line		Output shaft axis is in-line with the axis of motor rotation.
	Offset / Parallel		Output shaft is parallel with, but not concentric to, the axis of motor rotation.
	Right Angle		Output shaft axis is perpendicular to the motor rotation axis, intersecting or nonintersecting.
	Single-ended		One, single-ended output shaft.
	Other		Unlisted shaft angle or configuration.
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Feedback

	Feedback
	Your choices are...
	Integral Encoder		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 Resolver		Integral resolvers indicate angular position. Resolvers often rely on magnetic fields and are typically very robust; they are sometimes specified for harsh environments.
	Integral Tachometer		Tachometers produce an output indicating the rotational speed of the motor.
	Other		Unlisted or specialized feedback signal.
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Housing / Enclosure

	Motor Shape:
	Your choices are...
	Cylindrical Body		Cylindrical motor body cross-sections are round.
	Square Body		Square motor bodies have a square or rectangular shape.
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	Diameter / Width		Diameter of cylindrical motors or width / height of square motors.  This is for the motor body only and does not include flanges.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
	Housing Length		Housing length is the length of the motor body, not including shaft.
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	NEMA Frame Size		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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Features & Options

	Features
	Your choices are...
	Integral Clutch		Integral clutches engage and disengage the motor.
	Integral Brake		Integral brake can be mechanical or electronic.
	Brake / Clutch Combination		Integral combination of brake and clutch.
	Integral Driver Electronics		Integral driver electronics are on-board or attached drivers or amplifier electronics.
	Torque Motor		Torque motors are able to exert a constant torque even when stalled.
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	Environmental Features
	Your choices are...
	Open Frame / Frameless		Open-frame or frameless enclosures have minimal or frame-like support, but no overall casing.
	Totally Enclosed		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.
	Dust-proof		Dust-proof motors protect against dust infiltration with features such as total enclosure and labyrinth seals for shafts. The IP (Ingress Protection) rating for dust-proof motors is IP6x.
	Drip-proof		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.
	Waterproof		There are several degrees of waterproofing applicable to motors and they are reflected in the IP rating for the motor: IPx1: Protection against vertically falling drops of water (drip-proof). IPx2: Protection against direct sprays of water up to 15 degrees from vertical. IPx3: Protection against direct sprays of water up to 60 degrees from vertical. IPx4: Protection against water sprayed from all directions. IPx5: Protected against low pressure jets of water from all directions. IPx6: Protected against high pressure jets of water from all directions. IPx7: Protected against the effects of immersion up to 1 meter. IPx8: Protected against long periods of immersion under pressure.
	Clean Room Use		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.
	Cryogenic Use		Motors with a cryogenic rating are constructed for extremely low ambient temperatures such as 20 K and below.
	Explosion-proof		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		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 Use		Vacuum-rated motors incorporate features such as lubricant vapor pressure below rated ambient vacuum and construction techniques.
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Environmental Specifications Full required ranged of ambient operating temperature.

	Operating Temperature		Full required range of operating temperature.
	Search Logic:		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.
	Shock Rating		Shock rating is the maximum shock the motor can withstand and still meet operating specifications.
	Search Logic:		All matching products will have a value greater than or equal to the specified value.
	Vibration Rating		Vibrating rating is the maximum vibration the motor can withstand and still meet operating specifications.
	Search Logic:		All matching products will have a value greater than or equal to the specified value.

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