Hi,
We have a current tester (power supply) that outputs 1.1V to DC motor and measures the current for a few seconds. It has to be within a range (around 500mA) while the motor is spinning. I get a lot of rejected (failed) motors for too high of a current (The tester always reads 1A when this happens)
When I took the failed motor, powered it with a 1.1V AA battery, and measured the current, they were within range. I did notice a quick spike up to 1.6A when the motor first spinning and once up to speed the current is around 500mA.
Upon further investigation, I noticed that the current tester power supply has current limit set to 1A, which is why the tester only reads 1A. I guess the motor wants to draw more current but it is "clipped" at 1A. I wonder if this causes the motor to "stall" because it can never reach the speed needed to have the current settle at 500mA, because the 1A max limit is not enough for the motor to start spinning.
Please advise if my hypothesis makes sense.
thanks