[SOLVED] motor taking time to start

[sri5496]

hi,


am trying to implement a circuit to run an Dc motor using an AT mega micro, am was using a transistor to run the motor .but its taking long time to start (100 sec). is there a way to reduce this delay???

Thanks in advance

 

[horace1]

have a look at Microchip's motor control pages
https://www.microchip.com/pagehandler/en-us/technology/motorcontrol/

under documentation you will find application notes which may help

 

[andre_luis]

In absense of additional information, in my guess, the cause may be related to the inertia of the movement of an excessive mechanical load running over very well lubricated bearings.

 

[FvM]

It's hard to understand how you managed to achieve this very long start-up time, except by implementing an intentional speed ramp.

 

[ads-ee]

If the motor's load is near it's rated capacity, then you probably aren't supplying adequate current to the motor through your transistor, hence the extremely slow startup. How long is the startup when the motor is not under load?

Regards

 

[sri5496]

hi all,


am not controlling the motor speed am using just as an on/ off control and motor runing at rated speed. am using the motor for a pump load to build pressure. can i add a capacitor near the motor supply to help it with the startup.
Thanks in advance

 

[ads-ee]

hi all,
am not controlling the motor speed am using just as an on/ off control and motor runing at rated speed. am using the motor for a pump load to build pressure. can i add a capacitor near the motor supply to help it with the startup.
Thanks in advance

That doesn't tell us how it starts without a load. If it starts up significantly faster without a load, then you probably aren't supplying enough current to start the motor while under load. Electric motors require more current when loaded.

 

[sri5496]

thank you all for the response. i have got it running. the resistor which was connected to the base of transistor was faulty. replaced it and the motor is starting instantly .


:-D