More than 12 years ago I was taught that DC motor drive was dying and
would be dead soon. And indeed I no longer find any paper describing
DC motor drive in major IEEE journals (IEEE Transactions on Industry
Automation, Power Electronics and Industrial Electronics) after that.

Now I hear that people are using DC motor to replace AC motors. 
Interesting world. 

Yes the DC motor drive is much easier than AC motors.

Regards,
Xiaofan

-----Original Message-----
From: Bob J 
Sent: Tuesday, September 27, 2005 1:03 AM
To: Microcontroller discussion list - Public.
Subject: Re: [EE] VFD for 1 phase AC motor


I had a similar problem. My lathe had a single phase 2hp motor, but I wanted
to change speeds without moving the belt. When the motor gave up I replaced
it with a surplus 2hp 90V DC treadmill motor, and bought a KB Electronics DC
motor drive. The motor is a little bit noisier than the AC motor it replaced
but being able to change speeds with a knob has been wonderful. I had to
make a new mount for the motor and the total cost of the setup was around
$60. I really like the new setup and am going to convert some of my other
machine tools over to DC motors.

Regards,
Bob
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