Well, I am looking at operating several of these :
Data Sheet: https://catalog.precisionmicrodrives.com/order-parts/datasheet/307-100-9mm-vibration-motor-25mm-type
On the face of it, the wire gauge required is simple.
Typical Op Current : 130mA
Max Operating Current: 160m
Max.Start Current 430mA
And the manufacturer has already attached some lead wires:
Lead Wire Gauge: 32AWG
… and if I look up the rating for 32AWG, I see 2 values:
1 for ‘chassis wiring’ and 1 for ‘power transmission’.
For 32AWG they are 0.53A and 0.091A respectively.
I did google these two terms (chassis vs power), but "Unfortunately the ship is not a simple one, it depends on a number of factors… "
and seems each individual application is , well , individual !
I did grasp that a lot of it comes down to wire length. … the longer the wire, the more ‘strict’ one had to be in adhering to rules.
Given that the supplied lead wires are only 46mm, this how we get away with 32AWG ?
But I will need wires <=1 meter.
I will also not be in control of how frequently the motors will be switched on/off.
Theoretically they will be absolutely hammered, starting & stopping from standstill all the time.
(When ‘on’, they will be controlled via PWM, but I believe this will induce less than Start Current, as there is already momentum in the unit)
What’s worrying me, is that if I need a higher AWG wire, I am going to have to open the motor unit to access the existing lead wire solder points
Or possibly I could use 22AWG (0.9A Power) for 1 meter and simply connect the 46mm leads to the ends … though seems messy/untidy.
Would anyone be able & willing to advise me on how to approach this problem/calculation ?
I have emailed the manufacturer, but I would appreciate an ‘outside’ persepective as well … also might be interesting reading for others on the forums.
These motors will be mouted on or close to human skin, hence I am quite keen to build in the most sensible margin of error when it comes to safety