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  • Current Sensor Info.
    Open Loop Operating Principle In a hall effect-based current sensor, the magnetic flux, proportional tothe primary current, is concentrated in gapped magnetic corecontaining the hall effect device (Fig. 1). The primary current ismeasured without electrical contact with the primary circuit
  • High-five to high-side current sensing
    ACS75x current sensor depicts the main current path, the Hall-effect sensor with integrated electronics, and a magnetic concentrator which tightly couples the magnetic field of the measured current to the Hall-effect device. The Hall-effect device makes up only a small portion of the electronics
  • Reducing cogging torque in brushless motors
    is a Hall-effect device. The shape of the magnetic flux density in the air gap of an assembled motor is an indicator of its cogging torque. An example are these three curves shown for one pole pair. Each theoretical curve represents different magnetization and pole-arc angles for the same air gap length
  • Medical Device Link .
    Spotlight on Precision Motion Control A three-phase bridge-type brushless dc motor driver uses pulse-width modulation to control speed. The BLDC-350 has a brake input to enable dynamic and static motor braking. The controller includes Hall-effect sensors for commutation, and an integral heat sink
  • No problem with noncontacting sensors
    Invensys Sensor Systems, El Paso, Tex., (Clarostat Div.) has developed a rotary Hall-effect position sensor, the HRS100, that cuts cost by integrating all compensation circuitry into a single factory-programmed sensor ASIC. Resistive potentiometers or "pots " have long been used for rotary position
  • Feedback for servos
    motor from Danaher Motion is designed to accommodate most types of feedback devices without requiring extensive modifications in the housing or on the feedback device. Hall-effect devices are digital on/off sensors constructed of semiconductor material which senses the presence of magnetic fields
  • Micro moves
    mechanism, typically a slide or flexure. The end of the Squiggle screw moves the lens mechanism with precise speed and micrometer resolution. The mechanism incorporates position sensing to produce controlled steps. The camera's CMOS image sensor, Hall-effect, optical, or potentiometer devices may do

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