andy pugh wrote: > > > It's UK single phase, and neutral is only ever a few volts from earth. > OK, then the V- is swinging 50 times a second between -168 V from neutral and approximately equal to neutral. > >> Obviously you have full galvanic isolation between the power transistors >> and the driving >> circuits. >> > > I am trusting to cleverer folk than myself for that part. > > >> Also, make sure the motor connections are very >> well-made, >> > > The motor connector plugs cost more than the motors. They ought to be > up to the job. > http://sineco.3dcartstores.com/assets/images/PDFs/DataSheets/MB1CKN0600.pdf Well, also you have to trust the insulation of the motor. Assuming a brush motor, that can be compromised by dust from the brushes. If a brushless motor, there is a lot less to go wrong. But, still, making sure the safety earth is quite well done is a good idea. Don't assume a single earth connection to the machine base is sufficient, either, as the well-oiled slideways can be non-conductive.
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