This is what exacly daka motors sound. The lift in our building is a daka and i live on the 10th floor (potkrovje) and i always hear the lift going like this. Now i dont know why the heck the motor went a bit then stopped and then went agian. My guess: The lift tried to go with the inter doors open but then it realized and it stopped and the interdoors were closed and then it went agian. Thia happends in our building