I have created robot using a robot chassis kit from hobbyking. At first when testing the robot connected to USB power source and the wheels lifted above the ground everything seemed to be OK. Then, when I tried to power the robot with batteries I encountered a problem with starting the movement.
The robot hardly starts to move even when I power it with 100% of power - sometimes I have to push it a little bit in order to start driving.
As a newbie I don't know whether it is a power source (battery) or motors problem.
- There are 4 motors with torque of 800gf.cm min in the chassis.
- The gear ratio is 48:1 and to power the motors
- I used two serially connected Li-ion batteries and dc-dc regulator which limits the voltage output to 5V.
- The power is regulated with dual H-bridge motor driver.
According to specifications, the maximum free running current for a single motor is 250mA and I have read that the stall current is 3-8x running current.
Anyway, the problem is that the robot has problems with starting-up driving and I don't know how whether the motors are even powerful enough to move the robot or it is a power source problem or perhaps the obstacle could be solved with appropriate power regulation (ramp).
How can I solve this problem?