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Description: Most industrial motors require AC (alternating current) voltage whose polarity oscillates 60 times a second (for a frequency of 60 Hertz) between positive and negative. Single phase AC motors have brushes just like DC motors. Most of them have capacitors to assist starting and to establish the direction of rotation. Changing direction implies changes in the capacitors’ connection. Speed is directly proportional to the applied voltage (just like DC motors). Usage is restricted to low-power uses (home appliances like vacuum cleaners, washing machines, coffee grinders, or power tools like rotary hammers etc.). For higher power requirements, three-phase AC motors are used. These do not have carbon brushes to wear out, their rotors (called squirrel cages) have no electrical connections, thus making them extremely robust and long-lived. Only the stator windings are connected to the power line. They just keep turning as long as their ball bearings are OK. Changing direction requires swapping any two of the three phase lines. Speed control is done by modifying the frequency of the AC delivered to the motor; this can be done using complex devices called AC drives.
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Item
Price
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$2,048.00 Each
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$2,484.63 Each
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#5674090
US MOTOR HD40P2E 40 HP TEFC 1780 RPM
Brand MRO Supply
Model HD40P2E
$2,958.00 Each
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#1847414
WWE PEWWE125-12-445T 125HP 1200RPM 445T FR 208-230/460
Brand WorldWide Electric
Model PE125-12-445T
Obsolete
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$499.00 Each
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#5676143
$852.50 Each
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#5121722
AURORA 4TEP444T-125 4POLE 125HP 444T TEFC
Brand Aurora Motors
Model 4TEP444T-125
$4,296.89 Each
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