Hi people
 
I have a problem here hope you can help me
ok I am actually using a L298 H-bridge to control the motor
the EN pin is tied to a PWM signal and by using the different in duty cycle to
get the change in speed.
 
the problem is that when I measure the output at the driver side without the motor, the value that I get is proportional to the duty cycle every thing is perfect but when I connect it to the motor... the voltage does not defer much. the value for 30% to 90% only change about 1V.so any one have any idea how to solve this. is it I didn't use the correct frequency??
 
the value I am using are
PWM     62.5Hz
voltage    30V
 
thanks
regards