Hi, Im troubleshooting some intermittent failure and would love to get some advices please!
The spec for the motor is 5mA to 100mA.
Power source is ~3V powered from the USB.
I confirmed all the motors functions (read ~20mA) prior installation to a housing (glued with epoxy and cure at 70C for 2 hrs), after cured, 2% of the motors has intermitten failure that reads below 5mA, however once i removed the motors from the housing, they passed again.
I checked there was no short on the wires.
Resistance within spec while installed in the housing.
I tried to installed the "failed" motors in the housing again with and without epoxy - still passed
I then repeated the test with kapton tape on the housing, still got the same failure, where the motors would failed only when installed in the housing but passed after removing from housing.
Anyone has any idea what could cause the intermittent failure? The housing are made in AL and the fallout is always ~2% no matter how big the sample size or trials i did.
Thanks!
The spec for the motor is 5mA to 100mA.
Power source is ~3V powered from the USB.
I confirmed all the motors functions (read ~20mA) prior installation to a housing (glued with epoxy and cure at 70C for 2 hrs), after cured, 2% of the motors has intermitten failure that reads below 5mA, however once i removed the motors from the housing, they passed again.
I checked there was no short on the wires.
Resistance within spec while installed in the housing.
I tried to installed the "failed" motors in the housing again with and without epoxy - still passed
I then repeated the test with kapton tape on the housing, still got the same failure, where the motors would failed only when installed in the housing but passed after removing from housing.
Anyone has any idea what could cause the intermittent failure? The housing are made in AL and the fallout is always ~2% no matter how big the sample size or trials i did.
Thanks!