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Old 02-12-2018, 10:59 PM
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Default Dyno mags

So years ago you guys may remember that I scored a dynomometer that pretty much was not working. I have used various components off of the machine for different projects but I have always wanted to use the electromagnets off of the eddy current brake to make a mag drill or a magnetic vise. I have no idea how much power these magnets take to reach full pull. I know the power input can vary because that is how the eddy current brake works. Any body out there know how these systems work and what kind of power supply they need? I have the whole computer board but it has been years since It got disassembled and I have not much knowledge of what goes where simply because I knew I was not going to use it as a dyno anymore.
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Old 02-13-2018, 11:16 AM
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I would hook up the magnets to the correct DC voltage and see how strong they are.
Get some 40, 60, 100lb weight and see what it will hold.

Electric braking has been around a long time, and when used on mining equipment seemed to always be burning out. I am sure that it has been improved, but never knew the current draw of these things.
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Old 02-13-2018, 12:00 PM
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You could always take an ohm meter and check the resistance and what volts to hit it with and use ohms law calculator to see at least an idea of what to expect. As far as current draw.

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Old 02-13-2018, 09:14 PM
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Does the ohms law work for magnets? i never thought of figuring it out that way. I will try it.
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Old 02-13-2018, 09:53 PM
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I know driveline retarders on heavy trucks draw about 68 amps per stage. At full retard with all four stages switched on your looking 270 + amps. I would think that dynometer draws similar amperage.
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Old 02-14-2018, 09:17 AM
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Quote:
Originally Posted by Barn Owl View Post
Does the ohms law work for magnets? i never thought of figuring it out that way. I will try it.


If it is an electromagnet you should be able to measure coil resistance to measure the amp draw. If it is not an electromagnet then I don't know. And I sure don't know how to measure pull on the magnet or its capacity of hold or pull.

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