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  • Application Note: EMX3 Motor Overload Protection (.pdf)
    EMX3 motor overload protection is provided by a second order thermal model. This highly advanced protection method combines co-dependent thermal modeling of the motor windings and the motor body (the iron case), with allowance for different cooling rates when the motor is running and when it is off
  • Protecting Motors Against Overload Conditions Using “I-squared-T” Methods (.pdf)
    The goal of an effective motor overload protection scheme is to protect the motor from damage while allowing it to operate normally up to its thermal limit. Ideally such a scheme would be based on a direct measurement of internal motor temperatures. Unfortunately the temperature at different points
  • A crystal ball for motor controls
    in intelligent power devices have given rise to a new breed of MCC often called the Intelligent Motor Control Center (IMCC). Improvements in electronics have had an impact on purchasing criteria. Many MCC users now look closely at solid-state overload relays and networking options and less at more
  • Mechanical torque limiters still make sense
    overload protection. Electrical overload protection has been used since the days of the first industrial electric motors. Back then it simply protected motors against thermal overloads. Today, however, protection devices monitor many parameters - such as current, voltage, force, torque, rotation
  • Self-Protecting Starters
    the next two years. Several features make the SPS preferred over traditional motor controls. A self-protected starter combines contactor, overload, and short-circuit protection in one package. It is sized according to motor load current and horsepower. Generally, a small interchangeable module
  • The "no blip " power supply
    the supply off. Supplies using what's called fold-back technology will cycle off, reset, and try to cycle on continuously as long as there's an overload. Clearly, inductive loads such as dc motors or solenoids won't start up properly when the power supply oscillates on and off. In addition, there can
  • Torque limiters get fillers out of a jam
    disengaging the motor drive. Zero-Max Torq Tenders use an adjustable, springloaded convexshaped pin and detent overload mechanism. An overload condition disengages the pin from the detent and stops power transfer. Once the fault clears, the device can be manually reset (without tools) to its prefault angular

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