One thing to think about here is that when the AC voltage is rectified, the
DC voltage goes up by a factor of root 2 (VAC X 1.4142).  Therefore, 120 VAC
goes up to approx 170 VDC - you might want to up rate the DC motor to suit.

Brian.

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of A.J. Tufgar
Sent: 23 May 2003 16:41
To: PICLIST@MITVMA.MIT.EDU
Subject: [EE]: Designing a motor controller.


Hey all,
        I've been looking around the net for a variable speed motor
controller for a 2HP 120Vdc motor and have found they are rather
expensive.

I decided I might try making the controller myself, but I'm thinking
the controllers must be expensive for a reason.  Anyone know why?

I've attached a rather simple design to this message and would
appreciate any comments.

I have yet to design the inrush current limiter, but will probably use
an active mosfet design similar to the following:
https://www.onsemi.com/pub/Collateral/AN1542-D.PDF page 2.

Thanks for any input or help you may offer,
Aaron

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