Chief Delphi - What motors are you using for your lift?

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Re: What motors are you using for your lift?

Quote:

Originally Posted by jagoldman (Post 1441041)

My team is doing an elevator system that is run with chain. Our system is run by two Andymark 9015 motors and a 1:35 planetary from vex. These are the stats for the system are here.
Attachment 18255

With what we have so far it seems to work fine, but if the 9015 motors are not strong enough we are going to switch to the bane bots RS-775-18 motors. Here are the stats for the RS-775-18 motors.
Attachment 18256

My best advice would be to use the dual input attachment for the vex pro planetary gearbox. They are very easy to work with.

Best of luck!

PS. If you do use the 9015 motors, you have to cut the output shafts down a little for it to work with the dual input.

Wow, thanks for all that info. It really came in handy. I really do like your suggestion. If we do the VersaPlanetary Dual Motor Input, with 2 rs775 - 18v what gear ratio would you suggest? 1 to3? We are looking to lift all 6 totes + bin in about 3 - 4 sec. Also do you know of the shipping time for banebot. That might be the right choice for us, to go through banebot. We just need the items this week.

Thanks,
Joshua Sicz

Re: What motors are you using for your lift?

Quote:

Originally Posted by azcalg (Post 1441057)

We're using a van door motor with a 3.5 in winch. It lifted all 6 totes and a recycling bin 6 feet in like 4 or 5 seconds with no problem. I think we might up the size of the winch to 5 in so it'll go a bit faster. Van door motor is probably the simplest solution for this game because it has tons of torque and it's fairly easy to implement (don't need a gearbox or anything).

Very interesting, we have tons of window motors in our shop. We might have to try it.

Re: What motors are you using for your lift?

Please remember thermal mass when/if you want to hold elevator position in PID loop with motor...the fan cooled motors are not a good choice for this.
-Ronnie

Re: What motors are you using for your lift?

Using two versaplanetaries, each with a 50:1 ratio and a miniCIM. Definitely going to be enough, just not sure if it is fast enough. Might downsize later to like 30:1 or something similar.

Re: What motors are you using for your lift?

Quote:

Originally Posted by Joshua Sicz (Post 1441089)

Very interesting, we have tons of window motors in our shop. We might have to try it.

I can't find the specs at the moment, but I'm pretty sure the Taigene van door motors have quite a bit more torque than the window motors.

Re: What motors are you using for your lift?

Two CIMs geared 1.5:1 at the transmission. We can lift 6 plus container.

Re: What motors are you using for your lift?

One CIM, 1:25 versaplanetary gear box driving 15t sprocket chain system. Measured speed 1.3 feet per second. PID with 3 totes. Holding current about 8 amps using a clamp meter. About 25 amp at full speed with 3 totes. Our arm system is 22 pounds. No constant spring.

Re: What motors are you using for your lift?

Our lift mechanism originally used 2 CIMS one on each side through a 2 stage gearbox on each side. Due to weight issues, we swapped them out with 775 banebots with the CIMulator adaptor.
We saved 2 and 1/2 pounds and they easily lift the elevator with 6 totes with a trash can.
When we had the CIMS on, there were overkill, but only decided to swap out due to weight issues.

Re: What motors are you using for your lift?

We ended up using a cim for ours, geared 12:1 to the elevator via versaplanetary. We can switch to two if we need to or lower the gear ratio.

Re: What motors are you using for your lift?

Is there any good way to mount the VersaPlanetary Dual Motor Input? There are the two screw holes on the panetary gear box but I feel that would be too much weight only on two.

Thanks,
Joshua Sicz

Re: What motors are you using for your lift?

Quote:

Originally Posted by Christopher149 (Post 1441102)

I can't find the specs at the moment, but I'm pretty sure the Taigene van door motors have quite a bit more torque than the window motors.

Yes, the Taigene's stall torque is 360 lb-in and the window motor's (Denso) is 93.8 lb-in.

Re: What motors are you using for your lift?

Quote:

Originally Posted by Joshua Sicz (Post 1441088)

The gear ratio needed depends on what is happening after the transmission. What is the diameter of the drum or drive sprocket?

Define what you mean by lift 6 totes plus 1 bin in 3-4 sec, how far do you want to lift it in that time? Once you have created a 6T + 1C stack you only need to lift it a little more than 2" to place it on the scoring platform. That should be able to be done in a fraction of a second. So how are you creating that stack, ie what is the heaviest load and how far to you need to lift it and what is the highest distance you need to lift and how much is that weight.

Here is the JVN design calculator page. http://www.chiefdelphi.com/media/papers/2755? On the first tab copy the motor you wish to use and paste it into the linear motion tab motor fields.

You can then select the motors per trans, gear box efficiency (I use 10% per planetary stage), the amount of weight you wish to lift (don't forget the weight of the mechanism and a fudge factor to overcome the friction), the distance you want to lift the load and then play with gear ratios. For the planetary it is easiest to put 1 in for the drive and the ratio of the stage in the driven fields. For stages you are not using just put 1 in both fields. It is a good idea to make sure that the stall torque is significantly more than the load you want to lift in case the load "sticks". Personally I wouldn't design for less than 2X the actual weight.

Personally I'd recommend the Mini CIM or CIM for this application despite that it is more involved to mount. The 775 is a fan cooled motor so it doesn't like spinning slowly and really doesn't like being stalled. The CIM families on the other hand are much more tolerant of operating at slow speeds and being stalled.

Re: What motors are you using for your lift?

We are using 2 snowblower motors direct driving opposite ends of a shaft with a pulley fixed in the center. It is essentially a winch. We only need to lift 2 totes max. at a time.

Re: What motors are you using for your lift?

FRC558 is running a custom 18:1 worm gearbox with dual mini CIM input and for now a 4" diameter drum.

Re: What motors are you using for your lift?

Two CIMs on the lift. Jumping on the six CIM hype train here.