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Posts posted by ante

  1. Hi AG,

    That’s correct but; the torque does change long before this point (and thus the rpm under load) due to the inductance of the motor winding. When constructing a PWM controller for a motor there is some consideration regarding the frequency vs the inductance. This means that you need to know in which rpm range you are using the maximum torque when deciding the frequency.
    If you need to change the rpm without changing the pulse length it’s done by the amplitude.

  2. I don’t really see a computer PSU as a DC-DC converter, more like an AC- DC converter or primary switched DC-supply. I believed computers where more sensitive than they obviously are since they seem to accept dirty (cheap) DC. I have seen many HiFi stereo amplifiers with only a pair of rectifiers and some electrolytic caps barley filtered at all and still no hum. In one resent case (a receiver 2X100W) which only had 2X2200uF on each side of zero, 55 Volts at standby and about 45 V - 4A at 80W output. I mean if they can get away with this it cannot be very critical!

  3. Hi Zepplein,

    Here is some info about my bench PSU, I’ve got the one with 0 – 40V & 0 – 5A, it’s also available as 0 – 20V & 0 – 10A.

    Here is another one similar with a different name on it: http://www.elfa.se/elfa-bin/setpage.pl?http://www.elfa.se/elfa-bin/dyndok.pl?lang=en&dok=5645.htm

    Works really well too! ;)


  4. The motor does not have to be bigger to be stronger, the magnets and the armature winding decides the torque and power. You can re-wind the rotor (armature) with less turns of a greater gauge wire to get more power.
    It will of curse consume more power from the batterys too! ;)

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