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i need help on a project i am doing in which i am trying to control a dc motor speed in a following way
1. first i want to make it run for 2 minutes at a certain speed with having a Toff time in between for example
Ton=0.5 sec, Ton=0.5 sec this fives one cycle and want to continue this for two minutes.
2. after 2 minutes i have to increase the rpm of the motor ant Ton time as well where Toff remains the same.
i am am making this project to genrate vacume pressure inside a bottle but with this pattern only.
as per the motor dynamics it is not possible to rotate motor for that much less time as you said 0.5 sec.
it is also not possible to reverse motor in 0 time. you have to allow motor to rest for atleast 2 sec in between. because when motor is rotating at higher RPM it has some moment of inertia that will keep it moving is same direction for some time (say 1 sec). also it is required to use DBR – dynamic breaking resistance because when motor is suddenly stops and reverses it generates large back EMF
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