Allowing for ineffciencies, the effort required for 5W output will be about 0.01 HP (7.46W or 5.5 ft.lb/s). Hand-cranking the generator for any length of time would be exhausting.

 

My observation is that recharging a phone battery takes a while because the rate of charge acceptance is not very high, and also because of heating concerns. My main experience with hand-cranked charging is with my LED flashlight. That uses a gear train to increase the speed many times. it delivers to the LED about three volts at about 50 milliamps, because it is a high brightness LED.

And I once cranked the charger of a friend's crank-charged radio. That was interesting in that it was a well designed mechanical system that provided a large speed increase between the crank and the generator. It was not an extreme effort but it did get tiresome after a few minutes.
So any hand operated generation will require a speed-increasing mechanical arrangement.

 

At what speed? (RPM)

How often does the direction reverse?

Why can you not rotate it constantly in one direction?

Why won’t you explain the mechanical design?

If you want help, you need to tell us exactly what you are trying to do.

It's around 50RPM,

Direction rotation within 3 second,

As per requirement it needs to be rotated in both directions,

Basic design is to drop water droplets on both side of motor, like pulley system

 

Voltage required 5V, current required 1A

It's around 50RPM

Use this 12 V 58 RPM motor as generator:
Low Noise 0.5-47kg.cm High Torque 32-31ZY Brush Planetary Gear Motor 12v 24v DC Motor Reductor For Automation Equipment

 

If needing to back-feed the motor the planetary gearing would be the best option, (post #24) most other methods do not back-feed well, or at all.

 

I suggest doing the math to discover the mechanical effort input needed to provide that desired electrical power output. Then decide if those involved are willing and able to deliver that much effort for the time to charge a battery.
If the intention is to drive the motor by falling water as in : "Basic design is to drop water droplets on both side of motor, like pulley system", it is important to understand the amount of effort required to move a generator to deliver useful power.


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Basic design is to drop water droplets on both side of motor, like pulley system


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I suggest doing the math to discover the mechanical effort input needed to provide that desired electrical power output.

Math not needed. For motor in post #24 with rated current 1.2 A at rated RPM 45, torque is 55 kgf*cm,
so, using crank with lever length 10 cm, force 5.5 kgf needed for motor axe rotation.

 

OK, there is already a table of motor performance!! And thanks to Danko it seems that a force of 5.5 kG is required on a lever to rotate the motor. Now the TS needs to decide if that is a reasonable possibility.

 

Basic design is to drop water droplets on both side of motor, like pulley system

The waterwheel was invented centuries ago, and doesn’t need to change directions. How does your concept improve upon it?

 

My question is how to have it produce enough mechanical power to deliver that motion. There looks to me like a disconnect between desired electrical output and actual mechanical energy input.