giovannithex
New Member
Hello everyone.
I'm wondering if (how) could i make it possible;
I have simple circuit from two parts: one stands as PWM oscilator (555 timer) and that timer drives the transistor (npn, let us forget about efficiency for now)
On the CE line of transistor i have connected a DC motor of which speed i control via changing the pulse width.
When the motor is on full throttle, it gives away all the torque it has. But when lower the speed, the story is different.
My question follows - how could i get"fairly good" torque out of motor even spinning in lower speed?
I heard that there is possibility of using pin 5 on 555 timer. When the motor got loaded "too much", the voltage (of yet unknown circuit) tells the IC555 to increase the pwm signal to acheive the "same" speed of motor rotation, and when there is no / less load on motor, the pwm decrease and still keeps the "same" speed of motor.
But how should i take current from the mains of the motor and somehow make connection to control pin? Can anyone explain me that principle of the control pin?
thanks.
john
I'm wondering if (how) could i make it possible;
I have simple circuit from two parts: one stands as PWM oscilator (555 timer) and that timer drives the transistor (npn, let us forget about efficiency for now)
On the CE line of transistor i have connected a DC motor of which speed i control via changing the pulse width.
When the motor is on full throttle, it gives away all the torque it has. But when lower the speed, the story is different.
My question follows - how could i get"fairly good" torque out of motor even spinning in lower speed?
I heard that there is possibility of using pin 5 on 555 timer. When the motor got loaded "too much", the voltage (of yet unknown circuit) tells the IC555 to increase the pwm signal to acheive the "same" speed of motor rotation, and when there is no / less load on motor, the pwm decrease and still keeps the "same" speed of motor.
But how should i take current from the mains of the motor and somehow make connection to control pin? Can anyone explain me that principle of the control pin?
thanks.
john