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  • Users: AndreyG
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  1. AndreyG

    Electric Field distribution around two-conductor cable

    What is electric field distribution around two conductor cable connected to DC power supply? Assume power supply is isolated and not grounded. Assume cable is straight. Case 1: no current runs through the cable. One wire is positive, another – negative. Negative or zero? If we think in terms of...
  2. AndreyG

    How to start 1hp DC Motor

    What is proper way to start 1hp 24V DC Motor? Permanent magnet type. Can I just use contactor with sufficiently high current rating? (like, 100A, this is what my boss wants) Or do I need to rig resistive ladder and use multiple contactors? (I see lot's of literature on that, mostly old) Or do I...
  3. AndreyG

    Can 50HP Motor be accelerated from 0 to full speed in 1 second?

    Hello, Can 50HP motor be accelerated in 1 second from zero to full speed? And then decelerated in 1 second time? This question may sound naïve but this is really what I need to figure out. The RPM value is not important as I learned. The motor will be driving the pump and the pump is...
  4. AndreyG

    Can Antenna Pattern be modified without taking the Antenna apart?

    The antenna in question is dual polarized directional Panel, operates at 5GHz ISM band. Horizontal beamwidth 60 degrees. How to modify the pattern to make beamwidth ~120 deg (both polarizations) without disturbing radiating structure (structure is corporate-fed unidirectional patch array)? Is...
  5. AndreyG

    Problem - Hydraulic Cylinders vibrate when stopped

    Please help me to figure out hydraulic problem – I am not hydraulics expert. I got large ship steering system: tiller operated with two cylinders, controlled by directional valve. When the valve closes the rudder vibrates instead of stopping abruptly - makes several minute oscillations...
  6. AndreyG

    PLC with CANopen functionality and Marine Certified

    I would like to find PLC system with CANopen functionality and Marine Certified. certification for use in Marine Industry can be by any or all of the following agencies: ? ABS (American Bureau of Shipping) ? BV (Bureau Veritas) ? DNV (Det Norske Veritas) ? GL (Germanischer Lloyd) ? LRS (Lloyds...
  7. AndreyG

    Servo Control with Sine Cosine Potentiometers

    Servo control with Sine cosine potentiometers. I have controller and motorized rotating device both rotating over full 360 degrees – no limits. Both Controller and device are equipped with Sine Cosine Potentiometers. I am looking for simple (and preferably analog) way to compare outputs of...
  8. AndreyG

    How to increase angular responsivity of optical sens

    How to specify a lens to increase angular responsivity of optical sensor? Sensor I presently use has angular responsivity +/-60 degrees at 50% level and I would like to increase it to +/- 80 degrees at 50% level or more. Which lens should I use? Please advice on design guidance for this...

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