guyz ive made a rc car using a mosfet based h bridge the h bridge is working fine but i have to control speed also i will use pwm from avr microcontroller for it what ferquency should i choose for the motor speed control ? and when we choose high frequency and when we choose low what is the idea behind it plz let me know
Ultra-sound frequencies are used for the PWM speed control in a wheelchair or golf cart so that it is not heard (and so it does not deafen people nearby).
The inductance of the motor will reduce its maximum power if the frequency is too high.
I used 2kHz as the frequency for the motor of a model airplane so I COULD HEAR that it was running.
please mention some detail what do u mean by inductance will reduce power ?? if i use frequency below 100 hertz what will happen and if i use beyond 10 Khz what happens except the fact that human hear can hear till 20Khz what is the fact regarding electronics?
An electric motor has coils of wire that have some inductance (I don't know how much inductance your motor has). Inductance in an AC motor reduces its current at high frequencies.
if i use frequency below 100 hertz what will happen
it is due to the fact that bcoz of high frequency if inductance is large XL will be large and current will reduce and motor will be slowed is that so ?
it is due to the fact that bcoz of high frequency if inductance is large XL will be large and current will reduce and motor will be slowed is that so ?