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Does anyone have any ideas on how to build a simple but reliable motor controller for a high voltage (500v) DC motor?

I need to make a high voltage (500V), high current (20A) DC motor controller that uses a DC power source. It must be reliable and last a long time, and it also needs to be able control the speed of the motor from zero and up. Any ideas on building one or perhaps one that I can buy? Thanks!

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ANDY! (author) 3 years ago
Oh sorry, I am pretty inexperienced with this stuff, and most of my research didn't make much sense to me (probably due to my inexperience...) Yes it is a very big motor. Would using a lower voltage controller with a transformer in between work? Just an idea, I haven't seen anyone use it on the internet so far... It would be in between the motor and the controller, so that the controller would provide a low voltage source and the transformer would output a higher voltage.
Do you have a 220V supply or a 110V supply ?
You're looking at the thick end of 600 USD
ANDY! (author)  steveastrouk3 years ago
I think the highest DC voltage I can get is around 120V. Can you send me a link to the controller you are talking about?
No, what is your inlet mains supply ?
There's no problem with GETTING a suitable motor controller. Its not big as such things go - I've seen Megawatt rated DC drives.

The problem is PAYING for it, with a 16 year old's resources.

Put a good picture of the rating plate on the motor here. I'd like to review it.
rickharris3 years ago
Let me ask a very fundamental question - Why? Hat is the problem your trying to solve?
ANDY! (author)  rickharris3 years ago
I think the description I wrote above would suffice in answering your question..
Pat White3 years ago
Let me see if I can explain this in a manor you can comprehend.

What would you be if you were attached to another object by an incline plane, wrapped helically around an axis?

I couldn't find one for sale that didn't cost an arm and a leg.
That's a BIG motor.

For reliability, buy it in, it won't be very cheap though.
You don't say what you experience is - but on the basis that if you have to ask the question then it isn't good enough (yet) - I would go with Steve and buy one for such a serious task.