Announcement

Collapse
No announcement yet.

Motor Generators

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • BroMikey
    replied
    Originally posted by bistander View Post

    That's pretty dumb. You saturate like crazy. Now. Take the 60Hz 115V motor and run it at 400Hz 760V. Kinda like the Tesla EV motors.
    bi
    The point is there is little being said about conversion. A converter going from 115v 60hz input to a 400hz 115v output is 10 lbs for 500watt box. Guess how much it weights going the opposite direction? 4 lbs now that being said what results will be shown at 1500hz? People don't talk about this and no one knows. The only thing everyone says it to rectify and turn it into DC (as I have said) we have alot to learn. Wave forms with higher frequencies give off more steady state DC power than a 60 hz. More means more 5-10X

    Leave a comment:


  • bistander
    replied
    Originally posted by BroMikey View Post
    Blog EE

    I have played with surplus 400 Hz motors and found that they run just fine on 60 Hz if you reduce the voltage on the motor to 60/400 (~1/7) of its rated voltage. A 115V 400 Hz motor will run on 17V at 60 Hz. The current draw increases rapidly and the motor gets hot if you try to go much above 17V. And of course, like in the video, the motor only runs at about 1/7 the speed. The torque is about the same and since power is speed times torque, the output power is about 1/7 of the 400 Hz rated power.
    That's pretty dumb. You saturate like crazy. Now. Take the 60Hz 115V motor and run it at 400Hz 760V. Kinda like the Tesla EV motors.
    bi

    Leave a comment:


  • bistander
    replied
    Originally posted by BroMikey View Post
    So one day Dave decides to pop over to Greylands house and drop off a load of coils, bless his heart The reading for the double coil setup are 310v at 1.47 amps using those dang yellow meters. Keep in mind that the frequency is no longs 316hz because the rpm is higher and he is using more magnets. 4200 rpm-5000 rpm so take the low figure 22 magnets X 4200 rpm = 92,400 pulses per minute divided by 60 sec = 1540hz or pulses per sec same thing.

    Do you people understand the implications of skin effect and the relationship of such machines? Of course you don't. In aircraft 400hz is used to get huge amounts of power with a small device. Conversely a huge device running on such a high freq. has the potential of enormous outputs 5 -10 times that of 60hz ac volts.


    Please enlighten us about the difficulty or advantage caused by skin effect at those frequencies with the size wire used.

    And in the video, Greyland is using a commerical 2-pole 60Hz induction motor. Compare power density or specific power of that to any one of your axial PM generators and brag some more about "enormous" output.
    ​​​​​​​bi

    Leave a comment:


  • BroMikey
    replied
    Blog EE

    I have played with surplus 400 Hz motors and found that they run just fine on 60 Hz if you reduce the voltage on the motor to 60/400 (~1/7) of its rated voltage. A 115V 400 Hz motor will run on 17V at 60 Hz. The current draw increases rapidly and the motor gets hot if you try to go much above 17V. And of course, like in the video, the motor only runs at about 1/7 the speed. The torque is about the same and since power is speed times torque, the output power is about 1/7 of the 400 Hz rated power.

    Leave a comment:


  • BroMikey
    replied
    So one day Dave decides to pop over to Greylands house and drop off a load of coils, bless his heart The reading for the double coil setup are 310v at 1.47 amps using those dang yellow meters. Keep in mind that the frequency is no longs 316hz because the rpm is higher and he is using more magnets. 4200 rpm-5000 rpm so take the low figure 22 magnets X 4200 rpm = 92,400 pulses per minute divided by 60 sec = 1540hz or pulses per sec same thing.

    Do you people understand the implications of skin effect and the relationship of such machines? Of course you don't. In aircraft 400hz is used to get huge amounts of power with a small device. Conversely a huge device running on such a high freq. has the potential of enormous outputs 5 -10 times that of 60hz ac volts.


    Last edited by BroMikey; 06-27-2021, 11:58 PM.

    Leave a comment:

Working...
X