Response time of an electromagnet
Response time of an electromagnet
(OP)
Hi!
I'm designing an electromagnet used to guide electrons through a device. The electrons come in bunches at 1kHz. The electromagnet must be able to change field intensity between two consecutive bunches. I'm concerned about its response time. Does anyone know where I can find how to estimate it?
Adam
I'm designing an electromagnet used to guide electrons through a device. The electrons come in bunches at 1kHz. The electromagnet must be able to change field intensity between two consecutive bunches. I'm concerned about its response time. Does anyone know where I can find how to estimate it?
Adam





RE: Response time of an electromagnet
RE: Response time of an electromagnet
But I'm not clear what is meant by: "The electrons come in bunches at 1kHz. The electromagnet must be able to change field intensity between two consecutive bunches."
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(2B)+(2B)' ?
RE: Response time of an electromagnet
TTFN
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RE: Response time of an electromagnet
The higher the applied voltage the faster the current will ramp either up or down for any given inductance.
RE: Response time of an electromagnet
I also agree with your characterization, at least if we are talking about a dc or low frequency voltage applied to an inductor such that a current ramp occurs.
It's not clear to me what the scenario of interest really is and which aspects of the circuit will be relevant. Original poster has not bothered to log back in to clarify.
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(2B)+(2B)' ?
RE: Response time of an electromagnet
RE: Response time of an electromagnet
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(2B)+(2B)' ?
RE: Response time of an electromagnet
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(2B)+(2B)' ?
RE: Response time of an electromagnet
www.varedan.com
A voltage command sets the current level. The current loop can be set to match the inductive load and a small signal 10 kHz current loop bandwidth can be easily achieved. The ultimate limit to how fast current can be changed is deternined by the supply voltage. It can be up to +/- 150 VDC across the coil.
Not intuitively obvious is that the higher the coil resistance, the smaller the L/R time constant is. But for power loss in the coil, one wants the resistance to be as low as possible. Near the limit, there may be a power loss vs. speed trade-off.
A side note: these amplifiers are almost un-killable.