Problem: I am trying to hobby-build a generator using a (old, working, throw-away gas, yard blower) 30 cc, 2-stroke engine. The 2-stroke engine will spin a motor and I want the motor to generate DC current.
- Normal small-fan motor without magnets will NOT work; and if it does, it is extremely inefficient
- Ideally, one should use a brushed, DC motor to generate the power
- A DC motor used as a generator typically has permanent magnets
- Brushed DC motor is preferred to brushless DC motor (not sure why)
- Brushed motors may be spun/rotated in either direction (CW, CCW); however, one direction (CW) is preferred and slightly more efficient
- One can generate AC current from a DC source using an inverter/converter
- Ideal building blocks: (input) gas/oil mix --> run 2-stroke-engine --> spin brushed DC motor --> generate DC power --> charge a 12 volts car battery (12-volt 1ah; 12 DCV) --> 12 VDC to 120 VAC Inverter/Converter --> 120 AC current (output)
What I have tried:
- I used a small-fan 120-volt AC motor (without a permanent magnet) and realized that it will not work; it generates very little power
- I did google-searches and found some small cheap brushed DC motors on Amazon [e.g. 12/24V 30W High Speed CW/CCW Permanent Magnet DC Motor For DIY Generator (DC 12V 3000RPM)]. Interestingly, its comments/description on Amazon says “The stator windings of the motor are copper wire…” this confused me since I believed that in a DC motor with permanent magnets, the stator is the permanent magnets; i.e. it is not based on stator windings. Also, the motor’s physical dimensions are 1.97 x 1.18 x 1.97 inches. It seems rather small (physically). Is this unit good enough? Will it overheat?