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Thread: What is the PEM?

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    What is the PEM?

    OK guys, I give, what does PEM stand for and what does it do?

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    Roadster 537, Sig P85 ggr's Avatar
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    Quote Originally Posted by Pantera Dude View Post
    OK guys, I give, what does PEM stand for and what does it do?
    Power Electronics Module. It controls the power to, and regeneration from, the motor, converting DC from the battery to the AC needed for the induction motor. It also converts AC to DC to charge the battery. On the Model S these functions are separated again.

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    "I did not know that" (Johnny Carson)
    Thank you and I like the color of your car. My car of the same color arrives today!!! Can't wait!!!

    Quote Originally Posted by ggr View Post
    Power Electronics Module. It controls the power to, and regeneration from, the motor, converting DC from the battery to the AC needed for the induction motor. It also converts AC to DC to charge the battery. On the Model S these functions are separated again.

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    ERIC VFX vfx's Avatar
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    Model S R77 efusco's Avatar
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    So is it just a big inverter? If not, what's the difference?
    Evan E. Fusco, MD--Nixa, MO
    Model S R77/VIN-1267-- Black 85kWh (non-perf), Tech, Lacewood trim, tan interior, Sound Studio, Air Suspension, 19" rims, twin chargers, HPWC
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    mod squad TEG's Avatar
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    Yes it is a big inverter, but it also has the charging circuits inside too.

    In the early Roadsters (2008 1.5s) the PEM used an AC propulsion licensed "reductive charging" circuit that apparently used motor windings as part of the charging circuit. In the later cars (2.x 2010/2011/2012) they redesigned the PEM with what I recall were the following changes:
    #1: Smaller
    #2: Cheaper to produce
    #3: Easier to service
    #4: Redesigned charging that didn't use the ACP reductive charging license anymore.
    #5: New Sport variant available.

    There are also various discussions about merits and pitfalls of how the air cooling works in the different PEMs.

    I think some of the very early (prototype) Roadsters had analog circuits in the PEMs that were later replaced by digital circuits, but the original analog design never saw production.
    Moderator - Roadster, and Future Cars forums

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    Roadster Sports 835 & 972 ipdamages's Avatar
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    i dig how people on this forum generally answer questions in a prompt, thoughtful, on point, and thorough manner. i wish everyone with whom i interacted was like that!

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    XLNT! Thank you!

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    XLNT! Thank you Eric!

    Quote Originally Posted by vfx View Post




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