What is Frame?Frame is a designation that helps provide critical motor dimensions, such as shaft length, diameter, height, and mounting pattern. Horsepower, speed/rpm, and enclosure determine appropriate motor frame.
The National Electric Manufacturers Association (NEMA) and the International Electrotechnical Commission (IEC) defined these frame standards.
What Are My Options for Enclosure Design?There are two basic motor enclosure types: Open and Totally Enclosed. Choosing the right enclosure design depends on your application.
Open enclosures have a vented design that allows air circulation for cooling, while preventing liquids and debris from falling onto the motor components. They're generally used for clean, dry, indoor applications.Totally Enclosed enclosures block the exchange of air between the areas inside and outside the motor. Some include an internal cooling fan. They're suitable for use in damp, dirty, corrosive environments.
What is Nameplate RPM?RPM (revolutions per minute) is the nominal speed at which a motor operates under rated load. Motor performance can vary, and slight differences in the actual speed rating is acceptable for most applications.
What is Voltage?Voltage is the electrical power supplied to a motor for proper operation. To properly select a motor, you must determine the available power supply and match it exactly.
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General Purpose DC Motors
General purpose DC motors produce a constant torque (where torque is the measure of a rotational or twisting force) throughout their speed range making them ideal for use when the load is not significantly altered by the speed and provide full-rated torque at low rpms in conveyor belts, hoists, mixers, and positive displacement pumps. They have ball bearings that can handle heavier radial and axial loads due to the high torque that DC motors can produce. Motors are designed for mechanical loads and for hard-to-start applications such as conveyors, belt-driven equipment, machine tools, mixers, positive displacement pumps, and reciprocating pumps.
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