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  • AC Induction Motor Fundamentals
    AC induction motors are the most common motors used in industrial motion control systems, as well as in main powered home appliances. Simple and rugged design, low-cost, low maintenance and direct connection to an AC power source are the main advantages of AC induction motors. Various types of AC
  • Basics of MOSFETs and IGBTs for Motor Control
    Today's motors are increasingly driven via electronic controls, which offer better control of speed, position, and torque, as well as much greater efficiency, rather than via direct connection to their source of power (whether AC or DC). To do this, the motor-control circuit must switch the current
  • 'Low-surge' inverters
    New circuit topology lets ac servodrives keep a lid on surge voltages that can otherwise shorten motor life. The G7 inverter provides both open-loop and closed-loop vector control. Open-loop mode uses a flux observer algorithm to extend the speed range and provide true torque control. Closed-loop
  • Don't let regen rock your world
    Regenerative power can trip up servo designs that must stop quickly. A 1.8-hp ac servo, whose business end is visible in the lower right portion of the photo, is one example of a motor application that benefits from the use of a regen resistor. The mechanism on which it resides is part
  • Electronic monitoring relays
    or electrical currents. A typical application is to signal a warning when a pump motor is drawing too much current, as happens with a clogged water filter. In this case the monitoring relay senses the motor current (typically through a shunt connection) and actuates a relay if current remains above
  • First SOIC8-Packaged Hall-Effect Current Sensor With Integrated Current Path Introduced
    SOIC8-packaged Hall-effect current sensor with the current path integrated into the package for greater sensitivity and accuracy. Available in both 15 A and 5 A versions, it measures bi-directional ac or dc currents by using a Hall-effect magnetic field sensor to measure the field generated by the current flow

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