Yes, sounds really funny indeed. This comes from the VFD automatically adjusting the switching frequency, something I only know from the nidec drives like this one here.
@@TheLiftDragon I've heard a few others that change switching frequency automatically (which is even more common on trains), but this one sounds like it's doing some form of spread-spectrum trickery too. That I haven't heard on many other elevators.
@@aprilkolwey4779 On trains that is very common indeed, but on lifts I haven't really encountered it. And yes there even seems to be something more going on during start, I'll see if I can further investigate on it. The Nidec drives don't have a fixed switching frequency as a parameter like most other drives, but two parameters with a maximum and minimum frequency and the drive will automatically select the best within the range.
These are REALLY cool! I am a traction elevator fan myself, and 0.480 M/S is still Very fast for a 9ton elevator! Those motors are really vool, they aper to be Of The Shelf AC Asynchronous motors, used everwhere else. Is there any reason the preffer this motor? Also i didnt know 6:1 existed! But trough a Beno's video i found out KONE using a 10:1 roping with no counter wieght.
I also highly prefer traction over hydro and seeing a traction of this size is truly another experience. Regarding the motor: This is a Sassi winch after all and it seems that S assi just ships these bigger models with Leroy Somer industrial machines per default. Only the motors on the smaller gearboxes where they're directly flanged on seem to be branded Sassi. Regarding the roping: I was aware that 6:1 has to exist for exactly these giant freight lifts that are too tall for being a hydro but I have never actually seen it at all before discovering this. The 10:1 Kone PowerDisc thing I am aware of but again actually finding one to document is hard. There are almost none of the in Switzerland and the only one I found yet is just a 4:1 mod on an old Gebauer lift. Still interesting, might film at some point.
9000 KG on an electric F-L??? Already elevators with more than 6000 tons of load are rare but then these in electric version are even more so. I do not know what they can be used for but it is sure that they must be premises for very specific things I imagine.
Imagine how ultra surprised I was when I encountered this thing. xD The building here is a mostly normal office building and it's just storage on floors -3 and -4. I really wonder why such a giant lift was installed here, cause the upper floors just contain offices as usual and well the storage facilities in the basement even have 3 lifts. -1 and -2 are for parking.
Das ist interessant. Ich habe in meinen Unterlagen gesucht, denn ich war mir ziemlich sicher, irgendwo ein Handbuch zu genau so einer Vertikalschiebetür zu haben, aber habe leider nichts gefunden.
And what exactly makes you come to the conclusion that this motor is too small? How exactly do you define the required size of a motor? This is just a statement that is based on opinion. 45kW is the rated power and if you do the math, including some losses, only about 30kW are actually required to move this lift. Theoretically it would even be possible to move this lift faster - with this motor - only with a different gear ratio of the gearbox. But the traction sheave speed of 2.5m/s is a rather standard value and it most likely is the same as the speed from the original machine from 1990. So this motor is definitely not underspecced nor "too small".
@@TheLiftDragon If they made it 4:1, they would save on 4 pulley wheels, and 1/3 of the cable. With those savings, they could have added a bigger motor, with the same capacity and a higher speed. The motor looks like it's the same size as a 1960s tower block lift. It's not a small motor, but I was expecting a way larger motor. I guess they don't need a fast lift, but I wonder what made them choose this design.
@@mushroomcraft Do the math. 9000kg on 6:1 equals 3000kg on 2:1 or 1500kg on 1:1. That is about the load you get on a 1:1 lift. And that would already be in the upper range because many 3000kg lifts are 4:1 and not 2:1. If you keep that in mind, 6:1 is the right choice for this capacity. Yes, of course there are always some extreme edge cases, as Emch also built a 4000kg lift in 2:1 in 1990. That extreme case would equal 2000kg in 1:1 and that is something you almost never see. Generally speaking, I would call 8000kg really the economic upper limit of 4:1. Yes, more is possible but the dimensions of the components needed to carry the static load just get so big that 6:1 just makes more sense. Have more components of a more standardized size which is much more affordable than building a fully custom made extra large thing.
