Technology
DC/AC motors and generators

Dcmotor
Our pal Greg from DIY live sent in this article he wrote trying to differentiate the difference between AC and DC motors and generators – “I ran across some cool pages while studying about AC vs. DC motors. I was interested in taking a small DC motor, and connecting a propeller to it. I want to stick the motor on the outside of my car, and generate a small DC voltage to power my toy, ie. an iPod, or my cell phone. I need 5v for the task. The question I have been having is if you take a DC motor, and spin it, will you be producing a DC voltage, or an AC voltage. The answer it seems is that you will produce a DC voltage. It is kind of complicated, but is very interesting. The key to understanding a DC motor vs. an AC motor is to see how they are wired. A DC motor has a commutator.”Link.

Related:

  • HOW TO – Simple DC Motor Controller – Link.

10 thoughts on “DC/AC motors and generators

    1. You would need a DC to AC converter
      ——–
      look would I found. i wonder if this would work. ugh… I know noting about this stuff….

      would this work?
      I found a DC magnetic motor. Will this work? It looks like a motor used in electric cars or vehicles. The power rating caught my eye. Could it be that simple? I’m not worried about the RPM, I have that problem solved so I can get any RPM needed without wind power. Could this motor put out as it states 11.5 KW continuous? If so, Why would I buy a 10kw windmill or solar system for $30,000.00 USD when I can use a permanent magnet DC motor like this for 600.00 capable of 11.5 KW continuous. The equations V(V) × I(A) = P(W). Is this motor really going to put out 11KW of electricity or am I missing something here? Geez, I’d be ecstatic if it would even do 5KW. Sorry for the stupid question. I’m sure you are probably laughing at my craziness.

      Power: 11.5 kW cont– 23 kW pk <—– ?
      Voltage: 12-72 Volt rated
      Max Speed: 3700 rpm @ 72V unloaded
      ———————————
      EMC-RT200 w/
      Alltrax AXE7245 Controller
      38HP pk. Electric Drive Kit

      Includes

      EMC-RT200 Motor
      Alltrax AXE7245 Controller
      Choice of Throttle
      Contactor
      Wire Kit
      Fuse Holder w/ Fuse

      EMC-RT200 Motor

      The EMC-RT200 is a brush-type, permanent magnet DC motor with very high efficiency. Capable of 11.5 KW continuous and 23 KW for 1 minute. For voltages from 12 to 72 VDC input and 200 amps continuous (400 amps for 1 minute). Designed for battery operated equipment. For more information, see the Performance Information section. Motor weight of 39 pounds. This motor has similar performance to the Lynch, Lemco, and AGNI motors

      Power: 11.5 kW cont– 23 kW pk
      Voltage: 12-72 Volt rated
      Max Speed: 3700 rpm @ 72V unloaded
      Size: 8" OD, 7.4 " long (w/o shaft)
      Shaft: 7/8"x 1-3/4", 3/16" key
      Weight: 39 lbs.

      Click on an image above to enlarge in a new window ^
      Controller

      Alltrax AXE7245 72V 450A Programmable Controller

      Alltrax controllers are fully programmable speed controllers for permanent magnet and series motors. The free Windows compatible programming software allows for complete control of max current, max speed, hi and lo voltage cut off, acceleration and deceleration rates and custom throttle settings.

      Programmable via RS232 comm port using PC or Laptop
      Integrated anodized heat-sink with multi bolt pattern for flexibility
      Fully encapsulated epoxy fill – environmentally rugged design
      Advanced MOSFET power transistor design for excellent efficiency and power transfer
      1/2 Speed reverse option and "Plug Brake" options available

      450 Amps
      24-72 Volts
      Works with 0-1k, 0-5k, k5-0 ohms, 6-10.5V & ITS Throttles

      Throttle

      Choose from…
      – Magura Twist-Grip Potentiometer Throttle
      – EZ-GO Pot Box Throttle (PB-6 Drop-in Replacement)

      Contactor

      Please specify your contactor coil voltage at checkout. 24V, 36/48V, or 72V

  1. would this work?
    I found a DC magnetic motor. Will this work? It looks like a motor used in electric cars or vehicles. The power rating caught my eye. Could it be that simple? I’m not worried about the RPM, I have that problem solved so I can get any RPM needed without wind power. Could this motor put out as it states 11.5 KW continuous? If so, Why would I buy a 10kw windmill or solar system for $30,000.00 USD when I can use a permanent magnet DC motor like this for 600.00 capable of 11.5 KW continuous. The equations V(V) × I(A) = P(W). Is this motor really going to put out 11KW of electricity or am I missing something here? Geez, I’d be ecstatic if it would even do 5KW. Sorry for the stupid question. I’m sure you are probably laughing at my craziness.

    Power: 11.5 kW cont– 23 kW pk <—– ?
    Voltage: 12-72 Volt rated
    Max Speed: 3700 rpm @ 72V unloaded
    ———————————
    EMC-RT200 w/
    Alltrax AXE7245 Controller
    38HP pk. Electric Drive Kit

    Includes

    EMC-RT200 Motor
    Alltrax AXE7245 Controller
    Choice of Throttle
    Contactor
    Wire Kit
    Fuse Holder w/ Fuse

    EMC-RT200 Motor

    The EMC-RT200 is a brush-type, permanent magnet DC motor with very high efficiency. Capable of 11.5 KW continuous and 23 KW for 1 minute. For voltages from 12 to 72 VDC input and 200 amps continuous (400 amps for 1 minute). Designed for battery operated equipment. For more information, see the Performance Information section. Motor weight of 39 pounds. This motor has similar performance to the Lynch, Lemco, and AGNI motors

    Power: 11.5 kW cont– 23 kW pk
    Voltage: 12-72 Volt rated
    Max Speed: 3700 rpm @ 72V unloaded
    Size: 8" OD, 7.4 " long (w/o shaft)
    Shaft: 7/8"x 1-3/4", 3/16" key
    Weight: 39 lbs.

    Click on an image above to enlarge in a new window ^
    Controller

    Alltrax AXE7245 72V 450A Programmable Controller

    Alltrax controllers are fully programmable speed controllers for permanent magnet and series motors. The free Windows compatible programming software allows for complete control of max current, max speed, hi and lo voltage cut off, acceleration and deceleration rates and custom throttle settings.

    Programmable via RS232 comm port using PC or Laptop
    Integrated anodized heat-sink with multi bolt pattern for flexibility
    Fully encapsulated epoxy fill – environmentally rugged design
    Advanced MOSFET power transistor design for excellent efficiency and power transfer
    1/2 Speed reverse option and "Plug Brake" options available

    450 Amps
    24-72 Volts
    Works with 0-1k, 0-5k, k5-0 ohms, 6-10.5V & ITS Throttles

    Throttle

    Choose from…
    – Magura Twist-Grip Potentiometer Throttle
    – EZ-GO Pot Box Throttle (PB-6 Drop-in Replacement)

    Contactor

    Please specify your contactor coil voltage at checkout. 24V, 36/48V, or 72V

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