Guineafowl's latest activity

Do not overcompensate the motor inductance with capacitors as, when you turn it off, the two will become a resonant self-excited...

I’ve ordered three ##450V, 30\mu F## capacitors, having approached the calculation differently and got the same answer: At ##400V, 11A...

Thanks, I’ll get some EP grease. The only problem is, the lubricator is an oil reservoir, 11, and a tight-fitting felt wick, 9, which...

The heating could be induced by the thread profiles of screws and nuts not perfectly matching, as when new. If that is the case...

The screw is on the right, and turns the other screw via two 90deg gearboxes and a driveshaft under the lift area. The lift nut is no...

Ok, so a cosphi of 0.65 gives an angle of 49.5 degrees: $$Z=36.4\Omega <49.5° = 23.6 +j27.7\Omega$$ $$C=\frac 1 {2\pi f 27.7} = 115...

I don't know the details of the VFD that you're considering, but: Reducing the output frequency would be (approximately) the torque...

Measure the positive reactance of the motor at operating frequency. Then provide negative reactance to cancel most of that.

VFD manual should be linked in the first post. Yes, I thought lifting the car slower might reduce the loading of the system. Or, running...

As a first attempt, looking at the motor plate (connected in star): $$Z=\frac V I = \frac {400} {11} = 36.4\Omega$$ Find capacitor with...

1. Done - it has automatic screw lubricators which have been cleaned out and topped up. 2. Yes, certainly something to try. I assume 3...

Motor plate, for interest:

This one is a 3ph 400V in and out model. Can’t be changed. Cheap enough for a punt on this problem; if no go, I can use it for something...

Power supply to the 7.5kW rotary is 1ph, 240Vac. Supply voltage drop at full load is within 5%. The rotary outputs (roughly) 415Vac 3ph...

I’ve also seen it written: $$\int fg’ \,dx = fg - \int f’g \,dx$$ Maybe you could preface with ‘f and g are functions of x’ and save...