Sunday 13 August 2017

Blidgeport motor connected up and working

This morning (Sunday), refitted the motor, set up the parameters on the VFD and checked it out.

Everything fitted correctly and once I'd swapped over a couple of the phase connections, it even turned in the correct direction. You'll notice how the sun thoughtfully arranged to shine directly into my eyes when connecting the motor up. Ideal!





This motor is a bit noisier than the original "pancake" motor which seems to be very heavily made - the carrier frequency (a few kHz) is more audible. But it sounds good mechanically. 

Turns out the parameters were correct for this machine already. The nameplate info required is simply the phase voltage and current (220V / 8A) and the base frequency (50Hz). It doesn't care what the actual spindle speed is ie the number of poles the motor has. It's up to me to know that the base speed is 3000rpm instead of 1500rpm (at 50Hz). Seems I was operating the original motor with higher current settings than ideal. I don't seem to have buggered anything before, so all ended well. It's a 5.5kW drive, so there was plenty of current available should it have chosen to.

Another job down!

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