gauravkothari23
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Hi all.
I am controlling the speed of a 180V 2.5 Amps 2800 RPM DC motor using 8051 Controller using PWM.
The motor is operated at different speed as per the requirement. on a DC Motor Shaft, a round flange is being attached.
The system has a mechanical braking system which is not connected to Electronic System(Speed Controller). The braking is applied suddenly just for 500mSec anytime without any intimation when the motor is in motion. when the brake is applied for 500mSec the RPM of motor drops around 100 to 150 RPM, which is acceptable.
Now the problem is the motor takes around 60 to 90 seconds to reach to the set speed. if the set speed is not achived by the motor before next braking then again the RPM drop to 100 to 150.
so for Eg.
if the motor is rotation at 2000 RPM. when 1st brake is applied the RPM goes down to approx 1850, and if the brake is applied again after 8 to 10 seconds the RPM drops more to 1700 and so on...
The frequency i am using to control the speed of DC motor is 2Khz. i have even tried using low frequency of approx 250 Hz and also high frequency of 8 Khz. but still the problem continues.
Have attached the circuit diagram for reference.
220V AC to 12V and 5V circuit is not shown.
I am controlling the speed of a 180V 2.5 Amps 2800 RPM DC motor using 8051 Controller using PWM.
The motor is operated at different speed as per the requirement. on a DC Motor Shaft, a round flange is being attached.
The system has a mechanical braking system which is not connected to Electronic System(Speed Controller). The braking is applied suddenly just for 500mSec anytime without any intimation when the motor is in motion. when the brake is applied for 500mSec the RPM of motor drops around 100 to 150 RPM, which is acceptable.
Now the problem is the motor takes around 60 to 90 seconds to reach to the set speed. if the set speed is not achived by the motor before next braking then again the RPM drop to 100 to 150.
so for Eg.
if the motor is rotation at 2000 RPM. when 1st brake is applied the RPM goes down to approx 1850, and if the brake is applied again after 8 to 10 seconds the RPM drops more to 1700 and so on...
The frequency i am using to control the speed of DC motor is 2Khz. i have even tried using low frequency of approx 250 Hz and also high frequency of 8 Khz. but still the problem continues.
Have attached the circuit diagram for reference.
220V AC to 12V and 5V circuit is not shown.