Farm Duty motors are designed for applications requiring high starting torque and moderate starting current. IronHorse farm duty motors are used to power agitators, augers, compressors, surveyors, feeders, hay hoists, grinders, blowers and other farm equipment. Farm Duty motors have cast iron end bells with rolled steel bodies.
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AutomationDirect offers a wide variety of alternating current inverter-duty / vector-duty motors from Marathon Electric Manufacturing Corporation® at great prices. These industrial AC motors are available in a variety of horsepower ranges from 1/4 hp to 100 hp. and are rated for continuous operation in a 40°C ambient and for altitudes up to 3,300 feet (1,000 meters) above sea level (unless otherwise stated).
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General purpose electric motors have been around for many years. They are the workhorse of almost every industry. An inverter-duty motor is a much newer concept that was necessary as general purpose motors began to be driven by variable frequency drives (VFDs or inverters). An inverter-duty motor can withstand the higher voltage spikes produced by all VFDs (amplified at longer cable lengths) and can run at very slow speeds without overheating. However, this performance comes at a cost: inverter-duty motors can be more expensive than general purpose AC motors.
Guidelines for choosing an Ironhorse general purpose motor vs. an inverter-duty motor are available below. If your application falls within the guidelines, there is no need to apply an inverter-duty motor. Marathon inverter-duty motors have limitations as well. Please see the Marathon Motors section for more details.Guidelines for choosing AC Motors
In summary, general purpose AC induction motors can be run with drives in many applications; however inverter-duty AC motors are designed to handle much lower speeds without overheating and they are capable of withstanding higher voltage spikes without their insulation failing. However, with the increased performance comes an increase in cost. The additional cost of an inverter-duty motor can be worth it if you need improved motor performance.