How can I use dc motors to generate electricity in my house ?
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To be useable in your house, the off the shelf answer is to connect the dc motor to a solar panel inverter. This is the only easy way to change the dc in to ac and ensure it is in phase with the grid. (Assuming your house is also attached to the grid).
You would have to match the specs on the D.C. motor, the rpm of whatever is driving the motor/generator and the solar inverter to make sure you are making the DC voltage in the correct range.
Obviously rotate the shaft and assuming a PM DC motor it will generate a voltage. The bigger question is what can I use to rotate the motor? The classic methods are an exercise bike as has been demonstrated on some "energy" related TV programs where an astounding number of bikes have to be used to generate any useful power for domestic appliances.
Assuming you want something less ambitious say to charge a battery, a hand cranked (and geared) mechanism will enable this, but again you will need to do a lot of ‘cranking’ to generate any useful power as is evident in the LED torches using this method.
Some electronics to convert the variable voltage generated into a charging supply will also be required.