Root cause insight into the common BMW blower motor resistor failures
wrote in message ... On Mar 26, 3:51 pm, "tm" wrote: "Bimmer Owner" wrote in message ... On Tue, 26 Mar 2013 14:56:21 -0400, tm wrote: Any evidence it was checked with a scope? Yes. This quote below is verbatim from this location: http://www.bimmerfest.com/forums/sho...&postcount=131 Quote:
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http://www.bimmerfest.com/forums/att...entid=306784&d... Ok, they are most likely transistors and the two straps are combining the emitters. Is the center junction of the two straps connected to the motor? Does the red jumper connect to the 40 amp fuse? If both of those are a yes, then they are most likely NPN power transistors and the jumper ties the collectors together. Or power darlingtons. And it is just a linear supply. In your other pictures, the spring clips just hold the transistors against the heat sink.- Hide quoted text - - Show quoted text - The main points of his post, like the "two bridges that are .01 ohm resistors, that "balance" the motor don't concern you in the least? Blind leading the blind ============================================= It is common to place low value resistors in the emitters to balance the current in two paralleled devices. 0.01 ohms would be very realistic in a 40 amp system. As to blind, you exhibit that trait much better than anyone else involved with this thread. Asshole. |
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