The crocodile clips add just enough resistance to limit the current to a level which the power-supply can handle. This was stated way back in post#6 !!! and if you bothered to read and understand the replies we wouldn't still be discussing it 34 posts later.

If you don't believe me, connect the voltmeter to the output of the power-supply when the motor is pulsing on and off and you will see the voltage going up and down.

 

there is misunderstanding, Why I dont believe you ? I try to understand what you telling. I try to cope with language and techincal terms. My English not so good as well as knowledge about electricity. At post #6, he mentioned about rusty alligators or cables can limit max current. So I dont use rusty alligator and I told many times motor is run with alligator cables.

I also measured voltages of motor and quote you post #24. When I dont use crocodile, voltage shows 1.5-2.5v approximately and it changes. But when I use crocodile clips, voltage is 4.5v and motor run well. I told it before, probably you dont read this reply. So what is the problem with power supply in this case ?

 

there is misunderstanding, Why I dont believe you ? I try to understand what you telling. I try to cope with language and techincal terms. My English not so good as well as knowledge about electricity. At post #6, he mentioned about rusty alligators or cables can limit max current. So I dont use rusty alligator and I told many times motor is run with alligator cables.

I also measured voltages of motor and quote you post #24. When I dont use crocodile, voltage shows 1.5-2.5v approximately and it changes. But when I use crocodile clips, voltage is 4.5v and motor run well. I told it before, probably you dont read this reply. So what is the problem with power supply in this case ?

This question has already been answered in posts #4, #6, #34, #38 and #41