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mthomson(at)showmeproduct
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 Posted: Wed Oct 18, 2006 8:55 am Post subject: Permanent Magnet vs. Series Wound... |
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I am considering purchasing a hydraulic power pack for a landing application. The power pack comes in two type: Permanent Magnet and Series wound. I notice the series wound take more current for the same psi. What are the pros/cons of each type?
Thank you.
--
10/14/2006
[quote][b]
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nuckollsr(at)cox.net
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| Posted: Sun Oct 22, 2006 7:34 am Post subject: Permanent Magnet vs. Series Wound... |
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At 10:41 AM 10/18/2006 -0600, you wrote:
| Quote: | I am considering purchasing a hydraulic power pack for a landing
application. The power pack comes in two type: Permanent Magnet and
Series wound. I notice the series wound take more current for the same
psi. What are the pros/cons of each type?
|
It's almost a toss-up. If you're system raises and lowers
gear based on reversal of pump, then a PM motor is harder
to reverse and uses less reliable contactors (dpdt). Further,
PM motors have higher inrush currents and are harder on
contactors and put larger perturbations onto the bus when
they're energized. No an issue for starters since they're used
before anything else is expected to be functioning.
Landing gear motors could be operated many times per flight
cycle (touch and goes) and during times when other electro-whizzies
would prefer not to be disturbed.
Series wound motors reverse by selecting one of two
windings (CW or CCW). They're nicely controlled by simple
SPST contactors and have lower inrush currents. My personal
favorite is still series wound.
Bob . . .
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